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Copyright of Revista Foco (Interdisciplinary Studies Journal) is the property of Revista Foco and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Copyright of Revista Foco (Interdisciplinary Studies Journal) is the property of Revista Foco and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

The integration of the application of organic fertilization and safety for health from the point of view of food quality in the agro-industrial process, has been little studied in research and reported in scientific and non-scientific publications, which is currently becoming a problem for the health of our country and why not, for the world, due to the deficit and high costs of mineral fertilizers and the inappropriate use of water and residual products. The objective of this work is to expose the results of investigations carried out with swine residuals and sediments from reservoirs with vegetable crops under organoponic conditions, demonstrating the effectiveness and safety of these two residuals, used as a substrate in organoponic, to which chemical and microbiological analyzes were carried out to verify their use as organic fertilizers. The organic residuals from pig farms are rich in organic matter and appreciable amounts of mineral elements (N, P, K, Ca and Mg). The sediments have to be combined with organic fertilizers due to their low nutrient content compared to pig residuals. These results are of great importance from the social, environmental and safety point of view, risk reduction and prevention of food borne diseases, due to the positive effect of effluents and sediments in terms of soil preservation, its use as an organic substrate, and its safety due to the absence of pathogenic organisms. [ABSTRACT FROM AUTHOR]

The study was carried out in the livestock production module of CEAJAL, in the pig gestation area (n=12), fresh solid excreta were collected manually with a shovel and wheelbarrow, the lagoon-type biodigester was fed every day with two load levels organic (CO), CO15% and CO5% in order to determine the quality of the byproducts. The biogas and sludge were evaluated in 4 periods of 40 days each. The resulting data were analyzed using descriptive and differential statistics in the R program (4.3.1). The methane content in the biogas of CO15% and CO5% was 61.6% and 59.6%, respectively, (p<0.02). The sludge was subjected to a complementary drying treatment at environmental temperature, determining macro and micronutrients, of CO15% and CO5%, where MO, 53.9% and 57.4%; CT, 31.3% and 33.0%; NT, 3.4% and 3.5%; PT, 4.0% and 3.9%, respectively. Highlighting the statistical difference of the CT variable, (p<0.04). Despite a lower amount of CO, methane production is in the normal range and the nutrients in the sludge can be taken as a reference for organic fertilization in agriculture. To implement this type of technology, complementary treatments must be considered for each of the byproducts. [ABSTRACT FROM AUTHOR]

Copyright of Nativa is the property of Revista Nativa and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Copyright of Revista Ambiente e Água is the property of Revista Ambiente e Agua and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Copyright of Revista Ambiente e Água is the property of Revista Ambiente e Agua and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Copyright of Revista Colombiana de Biotecnología is the property of Universidad Nacional de Colombia and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Copyright of Revista IRRIGA - Brazilian Journal of Irrigation & Drainage is the property of Revista IRRIGA (Brazilian Journal of Irrigation & Drainage) and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Copyright of Revista IRRIGA - Brazilian Journal of Irrigation & Drainage is the property of Revista IRRIGA (Brazilian Journal of Irrigation & Drainage) and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Exergy is the maximum useful work that can be obtained from a system in a specific state and environment. Exergy research has focused on energy fuels, although wastewater systems have not been studied in depth. This review explores the study and exergy use for wastewater systems in Latin America over the last 20 years. Chronological production, authors, citations, geographic origin, topic and purpose of publishing were examined through a documentary and bibliometric analysis. Exergy has started its development in Latin America, and it is led by a single school, there is evidence of a single author with 30% of citations and 25% of publications. Brazil, Colombia and Mexico produced 81% of publications, their main purpose is evaluating processes and by-products. The review concluded an incipient exergy development in wastewater systems in the region and exposed the need to stimulate research as a strategy to achieve the SDGs. [ABSTRACT FROM AUTHOR]

Copyright of Tropical Grasslands / Forrajes Tropicales is the property of International Centre for Tropical Agriculture - CIAT and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Water is an indispensable natural resource for the survival of living beings, as well as for performing anthropic activities. However, in urban areas, watercourses are directly affected by impacting activities, making these resources increasingly scarce and degraded. The objective of this work is to analyze the water quality index (WQI) of the Cintra River, located in the city of Montes Claros, state of Minas Gerais, southeastern Brazil, and indicate the current state of conservation of the watercourse. Water samples were collected and physical-chemical and microbiological analyzes were performed in four distinct points of the Cintra River. The WQI analyzed indicated that the watercourse has a good degree of preservation only in the nascent area. In the other points analyzed, the WQI indicated a reasonable or poor state of preservation. The discharge of effluents and the irregular disposal of solid wastes are the most significant impacts on the degradation of the Cintra River. Uncontrolled urbanization, as well as the removal of vegetation present on the banks of the Cintra River, are other factors that contribute to its degradation. The current state of conservation of this river may represent serious public health problems, since waterborne diseases may affect the population.Water is an indispensable natural resource for the survival of living beings, as well as for performing anthropic activities. However, in urban areas, watercourses are directly affected by impacting activities, making these resources increasingly scarce and degraded. The objective of this work is to analyze the water quality index (WQI) of the Cintra River, located in the city of Montes Claros, state of Minas Gerais, southeastern Brazil, and indicate the current state of conservation of the watercourse. Water samples were collected and physical-chemical and microbiological analyzes were performed in four distinct points of the Cintra River. The WQI analyzed indicated that the watercourse has a good degree of preservation only in the nascent area. In the other points analyzed, the WQI indicated a reasonable or poor state of preservation. The discharge of effluents and the irregular disposal of solid wastes are the most significant impacts on the degradation of the Cintra River. Uncontrolled urbanization, as well as the removal of vegetation present on the banks of the Cintra River, are other factors that contribute to its degradation. The current state of conservation of this river may represent serious public health problems, since waterborne diseases may affect the population.

Water fit for human consumption is an exhaustible source due to its incorrect use, constant population growth and contamination of supply sources, among other factors. The food processing industry is one of the most polluting of the receiving sources where liquid residues are deposited. Meat processes are one of the most influential in environmental deterioration due to the aggressiveness of its residuals. For this reason, this study proposes a technological change that improves the quality of the effluent generated in the residual removal, replacing the Conventional Residual Treatment Plant (PTRc) with a membrane bioreactor (BRM), at the Research Institute for the Food Industry. [ABSTRACT FROM AUTHOR]

Copyright of Revista IRRIGA - Brazilian Journal of Irrigation & Drainage is the property of Revista IRRIGA (Brazilian Journal of Irrigation & Drainage) and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Copyright of Revista Brasileira de Engenharia Agricola e Ambiental - Agriambi is the property of Revista Brasileira de Engenharia Agricola e Ambiental and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

The lack of environmental sanitation in the rural area poses risks to the environment and the health of the rural inhabitants, since they use water coming from a well or directly from the watercourse and, therefore, this work had the objective of designing and constructing a treatment system of sanitary effluents, through an evapotranspiration tank for rural property with up to two inhabitants, using ornamental species, in the city of Rio Verde, Goiás. For the dimensioning of the tire chamber of the tank, the current Brazilian Standard was used. The useful volume of the tire chamber was 3.26 m² and the total area of the evapotranspiration tank was 10.5 m² (dimensions 3.5 x 2 x 1.5 m). The evapotranspiration tank is a viable system because, for its construction materials are used that can be purchased at no cost, reusing materials such as construction and tires, collaborating with the environment, as well as reducing the amount invested for the construction of the Evapotranspiration tank. Cleaning up in the minimum salary of 2019, which was in the amount of R$ 998.00, for the construction of the evapotranspiration tank were spent less than 1 minimum wage, already, for a septic tank is spent on average from 2 to 4 minimum wages. [ABSTRACT FROM AUTHOR]

Introduction: Gas biofiltration in an organic fixed bed works as a natural filter with high porosity and sorption properties. It retains contaminants by physical-chemical processes and on the other hand, it supports the growth of degrading microorganisms. Complex mixtures such as active sludge application for biofilters inoculation is more convenient than the isolated species use. This guarantees a favorable culture medium for microorganisms development, which close biogeochemical cycles of elements such as sulfur, carbon, nitrogen and phosphorus. However, problems may arise with regard to effluent discharge regulations in order to preserve quality of receiving ground waters. Objective: To evaluate the quality of a residual effluent from biological treatment system of natural gas. Materials and Methods: Chemical and microbiological parameters were determined according to the (APHAAWWA- WEF, 2005) and ISO standards. Results and Discussion: It was demonstrated that there is a growth of bacteria and fungi degraders of H2S (g) of natural gas of 6.0·108 CFU.mL-1; and it was corroborated that there is a gradual increase in sulphate concentration from 20.4 to 867.51 mg.L-1, as a result of this degradation Conclusions: A strong correlation between the bacterial development and the decrease of nitrogen content in the system was observed; and it was possible to remove other pollution indicators as fecal coliforms, COD, BOD and sedimentable solids in effluent, in order to improve discharge quality. [ABSTRACT FROM AUTHOR]

Copyright of Revista Ambiente e Água is the property of Revista Ambiente e Agua and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Copyright of Engenharia na Agricultura is the property of Engenharia na Agricultura and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Copyright of Tecno-Lógica is the property of Tecno-Logica and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Copyright of Revista Colombiana de Ciencia Animal - RECIA is the property of Revista Colombiana de Ciencia Animal - RECIA and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Copyright of Revista Ambiente e Água is the property of Revista Ambiente e Agua and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Rio Grande do Sul is responsible for much of the agate geode extraction in the world. The agate is characterized as a porous material, suitable for dyeing processes, which generate effluents of high toxicity potential by the presence of cyanide ions (CN-), which, in certain concentrations, can be lethal to the health of living beings as well as causing numerous problems in the water bodies where these effluents are launched without proper treatment. This research aimed to compare alternative ways of treatment of wastewater containing CN- (aq) ions through the use of advanced Oxidative Processes (POAs) such as modified Fenton and photo Fenton, assisted by ultrasonic radiation. To verify the efficiency of the processes were quantified parameters such as discoloration and Chemical Demand Oxygen (COD), between raw and treated. The highest efficiency was obtained for the process with UV radiation using hydrogen peroxide (H2O2) 30% in 25 minutes the degradation reached 50.72%, reaching the end of the process with 57.63% degradation of the effluent color. [ABSTRACT FROM AUTHOR]

Irregular pluvimetric precipitations and high evapotranspiration are characteristic of the semiarid region of northeastern Brazil. The set of these variables make water a limiting factor for irrigated agriculture, which makes reuse necessary, especially in places under conditions of growing scarcity. The objective of this work was to propose the use of water from air conditioning and agroindustrial effluent in the production and development of papaya seedlings. The research was developed in the seedling production sector located at the Federal Institute of Paraíba, Campus Sousa. A completely randomized block design was used, with five treatments and four replications. The treatments were the use of water from artesian well, air conditioning of the combination air conditioning and artesian well (1:1), of agroindustrial effluent; Of the combination of agroindustrial effluent and air conditioning (1:1). Papaya seedlings were produced in plastic bags, using Neossol Fluvic and manure in proportion (2:1) as substrate. The following variables were evaluated: plant height, stem diameter, number of leaves, green and dry mass of shoots and roots, content of (nitrogen, phosphorus and potassium) of leaves and influence on soil attributes (PH, P, K, Na, Ca, Mg, MO, PST). The use of water from agroindustrial effluent infered lower results for most variables. The use of air-conditioning waters emerges as an economically viable alternative for the use in irrigation of papaya seedlings. [ABSTRACT FROM AUTHOR]

Copyright of Revista Caatinga is the property of Revista Caatinga and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Copyright of Ambiência is the property of Revista Ambiencia and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Due to population growth, there is an increase in the tendency of water resource degradation. One of the biggest polluters is the practice of dumping industrial and domestic effluents without any treatment on the watercourse. The utilization of effluents is an alternative to minimize the inadequate waste dump, thus avoiding the overload on the treatment system as well as cutting down costs and expenses. This work's objective is to evaluate the application of reverse osmosis in a food industrial effluent, in physicochemical and toxicological terms. A reverse osmosis technical application was conducted and then the effluent was examined, before and afterward, in terms of pH, Turbidity, Colouring, Conductivity, Dissolved Oxygen, Total Organic Carbon, and Total Nitrogen as well as a toxicological evaluation (Allium cepa). According to the obtained result, it can be identified that the technique of reverse osmosis showed treatment efficiency when applied to the effluent containing coloring and soy isoflavones, with regards to the physicals and chemical evaluation. In terms of toxicological evaluation, with respect to the radicular development, the treated effluent (permeate) showed a radicular growth, once the raw effluent did not develop any root. [ABSTRACT FROM AUTHOR]

The water body, object of this study, Grande igarapé, is located in the Municipality of Boa Vista, State of Roraima, in the northern region of Brazil. The present study aims to evaluate the environmental impact caused by the contribution of substances in the igarapé and possibly in the Branco River after receiving the ETE / Boa Vista-RR effluent through the determination of physical-chemical and biological parameters (chlorophylla). In the accomplishment of this study six points of collections considered strategic to the attainment of the proposed objectives were selected. The parameters were analyzed: color, turbidity, conductivity, pH, temperature, dissolved oxygen, nitrite, ammonia, total phosphorus, chloride, BOD5, COD, chlorophyll a. The igarapé suffers the human impact through the withdrawal of the vegetal cover, waterproofing of the ground by the occupation of the surroundings and launches of polluting agents. Through the results it was possible to confirm the impact of the discharge of the effluent on Great stream. Parameters such as phosphorus, ammonia, nitrite and chlorophyll-a have shown that the Grande stream does not have assimilation capacity, especially during periods of drought, of nutrients and contaminating species during the journey to its mouth in the Branco river. The analysis of the data obtained in its environmental amplitude shows the need to plan actions to reverse the environmental damage caused to the Great stream and its biodiversity. [ABSTRACT FROM AUTHOR]

Vinasse is the main liquid effluent from the production process of fuel ethanol from sugarcane (Saccharum spp.). Due to the large volumes generated, its treatment is one of the biggest challenges for the sugar sector. Geitlerinema is a filamentous cyanobacterium with heterotrophic metabolism. For this reason is possible to culture it for treating high turbidity effluents, such as vinasse. The objective of this study was to determine the potential of the heterotrophic culture of Geitlerinema sp. as a treatment method for sugarcane vinasse. It was cultivated in the undiluted effluent, with the addition of glucose (10 g l-1). The changes in the concentration of biomass, organic carbon and total nitrogen were recorded. The percentage of lipids and proteins of the biomass was determined at the end of the experiment. The filamentous cyanobacteria did not increase its biomass during 24 h of culture. Carbon (35%) and nitrogen (75%) removal was observed. The final composition of the biomass in lipids and proteins was 15.0 and 14.6% (m / m), respectively. The removal of 75% of the total nitrogen from the culture medium observed at the end of the experiment suggests the potential of the cyanobacterium as an option for the treatment of sugarcane vinasse. [ABSTRACT FROM AUTHOR]

The current scenario of water scarcity and the increasing need to protect the environment show how vulnerable nature is to human actions and retakes the importance of applying smarter water uses. For this reason, the reuse of effluents should be seen as an alternative to attenuate the imbalance generated by the lack of management of water resources. The objective of this work is to analyze the feasibility of reuse of the treated sewage in the Arrudas TEP, located in Sabará - MG, in secondary activities and non potable uses within the ETE itself or in nearby regions. For this, a bibliographical research was conducted to guide the evaluation of the effluent so that the treated effluent was in accordance with the parameters established by the Environmental Legislation and did not offer public health risks. Data were collected from the ETE for the evaluation of the effluent quality and correlation with the norms dictated by the Norms and, finally, the possible alternatives of effluent reuse were evaluated. The results clarify that it is possible, according to the class of treated sewage, to reuse for nobler purposes in order to avoid the direct discharge of the effluent into the bodies of water. [ABSTRACT FROM AUTHOR]

The aim of this work was to evaluate the production and the quality of fertirrigated cherry tomatoes with pisciculture wastewater with and without probiotics. The experiment was conducted in pots, under ambient conditions protected by 50% sombrite. The experimental design was a completely randomized design with four treatments and four replicates, the experimental unit consisting of thirty-two plants. Four water slides were tested: water; water from fish farms without the use of probiotics; water with probiotic and probiotic pisciculture wastewater. Probiotic addition was performed every 48 hours, with 0,5 g of probiotic containing at least 5x109 billion colony forming units per viable gram for every 8 L of water, each plant receiving 1 L of water manually in the morning. The soil used in the experiment to fill the vessels was classified as a NEOSOLO QUARTZARENIC dystrophic sandy texture caatinga stage, mixed with organic compound. The results showed that there was no difference between treatments for yield, number of fruits, fruit weight and pH. The treatment of water with probiotic was the one that presented lower acidity and better relation SST / ATT. The reuse of fish water with and without addition of the probiotic for fertirrigation of the cherry tomato crop did not interfere in the fruit production. [ABSTRACT FROM AUTHOR]

The evaluation of the effluent treatment efficiency is very important when it comes to industrial water reuse. On a daily basis, industrial activities generate solid and liquid waste, known as industrial effluents. This work evaluated the efficiency of the treatment of the effluents generated by a dairy in the region of Presidente Prudente / SP in order to verify if it is able to be released in the sewage network to continue its final treatment. The dairy in question launches its effluents into the sewage collection network of the São Paulo State Sewage Company - Sabesp and, in order for this process to be properly carried out, Decree No. 8.468 / 76 determines maximum permitted values for parameters such as Biological Demand of Oxygen, Chemical Oxygen Demand, pH, Oils and Grease Content and Sedimented Solids. Samples were collected at the company's treatment plant and analyzes were done based on Standard Methods of Water and Wastewater, which describes the standard analytical methods for water and sewage. In view of the conformity of the results obtained in the analyzes it was possible to determine that the treatment performed by the dairy is effective and complies with the current legislation. [ABSTRACT FROM AUTHOR]

Copyright of Brazilian Journal of Oceanography is the property of Instituto Oceanografico da Universidade de Sao Paulo and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Copyright of Revista Brasileira de Saúde e Produção Animal (RBSPA) is the property of Revista Brasileira de Saude e Producao Animal (RBSPA) and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

The Pituaçu lagoon is part of the Pituaçu Metropolitan Park (PMP). Its receives domestic wastewater and rainwater and is in an accelerated process of environmental degradation. This study aimed to determine the concentration of metals (Al, Cu, Fe, Mn, V) in pond sediments Pituaçu Metropolitan Park, Salvador, Brazil. Seven sampling points were defined. The determination of metals (Al, Cu, Fe, Mn and V) was accomplished using the technique of optical emission spectrometry with inductively coupled plasma (ICP OES). The range of concentrations found were: Al (3,618-27,210 mg kg-1); Fe (11,968-122,030 mg kg-1); Mn (44.00 to 481.50 mg kg-1); V (25.00 to 111.50 mg kg-1) and Cu (4.05 to 25.50 mg kg-1). The order of concentration at various points was Fe> Al>Mn> V> Cu or Fe> Al>Mn = V> Cu, with the highest and lowest concentrations of all metals found in the points P1 and P3, respectively. There was spatial variations in the concentrations of metals, with higher concentrations in sample points with anthropogenic activities (effluents and agricultural activity). This study reports relatively high levels, especially for V, indicating possible need of expand conservation actions or environmental monitoring to avoid accumulation of these metals in toxic levels for water, sediment and its biota. [ABSTRACT FROM AUTHOR]

Commander Ernesto Che Guevara Nickel Company's Carbonate thickener effluent, as an average, contains 183,03 mg/L of total nickel, from this 81,3 % is in a dissolve nickel form. This paper aim was to recover the greatest quantity of nickel as possible from this effluent by using the coagulation--flocculation process. Test runs were carried out with hydrated lime addition in different dosages, for aiding coagulation and other ones with the previously distilled effluent. Six coagulants from different companies were assessed in different dosages, including an effluent that is common for all the tests. The best results were obtained with the use of the aluminum sulfate in dosages of 300 mg/L as well as hydrated lime at 150 mg/L, with a recovery of 91,70 % of the total nickel and 88,67 % of the dissolved nickel. With the predistilled effluent no high precipitation values were achieved. [ABSTRACT FROM AUTHOR]

Copyright of Revista Brasileira de Agricultura Irrigada - RBAI is the property of Revista Brasileira de Agricultura Irrigada - RBAI and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Copyright of Acta Scientiarum: Technology is the property of Universidade Estadual de Maringa and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

The purpose of this study is to perform toxicity tests with microalgae Pseudokirchneriella subcapitata (Chlorophyceae) using inland water samples to evaluate the impact caused by aquaculture. Six field samples were collected ranged November 2006 to March 2007, at Experimental Station, Pindamonhangaba, State of São Paulo. Abiotic factors pointed out to the mesotrophic and eutrophic characteristics already observed at the fish pond and its effluent. The results of ecotoxicological tests carried out with the microalgae Pseudokirchneriella subcapitata showed that the fish pond effluent was potential enough to stimulate the algal growth, therefore eutrophication, to the extent that it is naturally diluted to at least 12.5% of its initial concentration. This type of test can be a tool to be used by environmental managers in attempts to measure the extents of the impacts of effluent discharges from fish farming and to propose treatments based on qualitative and quantitative information.O objetivo deste trabalho foi realizar testes ecotoxicológicos com a microalga Pseudokirchneriella subcapitata (Chlorophyceae) em amostras de água de piscicultura continental, para avaliar impactos gerados pela atividade. Seis campanhas amostrais foram realizadas entre novembro de 2006 e março de 2007 na piscicultura experimental, Pindamonhangaba, Estado de São Paulo. Os fatores abióticos apontaram para características mesotróficas e eutróficas do viveiro e do efluente. Os testes com amostras brutas indicaram que mesmo após o encontro do efluente com o corpo de água receptor, a carga orgânica do viveiro foi capaz de estimular crescimento algáceo. Os resultados obtidos nos ensaios ecotoxicológicos realizados com a microalga Pseudokirchneriella subcapitata demonstraram que o efluente do viveiro de piscicultura exerceu um risco de eutrofização do meio até o ponto em que o mesmo estiver naturalmente diluído a 12,5% da sua concentração no corpo hídrico receptor. Ficou demonstrado que este tipo de ensaio pode ser uma ferramenta passível de utilização por gestores ambientais nas tentativas de mensurar as extensões dos impactos dos lançamentos de efluentes de piscicultura e de propor tratamentos com base em informações qualitativas e quantitativas.