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The present study aims primarily to investigate the flocculation capacity of a novel potato peel-based bioflocculant in wastewater treatment. The analysis of wastewater revealed high COD and BOD5 contents that could respectively reach the values 529.08 mg O2/l and 317.03 mg O2/l. In addition, the effect of experimental parameters such as the pH, coagulant/flocculant dosage, and contact time, was studied using the coagulation-flocculation treatment technique. The experiments were carried out with a lab-scale jar-test apparatus where aluminum chloride (AlCl3) was used as a coagulant agent. It should be noted that the optimal dose of AlCl3 was equal to 0.6 g at 10 mn, with turbidity reduction of 99.01%. Moreover, the flocculation tests showed higher turbidity removal (98%), for a flocculant dosage of 0.2g. The results obtained in this study indicated that using the natural potato peel-based flocculant, in the presence of a coagulant, provides an effective and environmentally friendly coagulation option for wastewater treatment.

Pollution caused by wastewater is a serious problem in Algeria. This pollution has certainly harmful effects on the environment. In order to reduce the bad effects of these pollutants, many wastewater treatment processes, mainly physico chemical are implemented, In this case, the method most used is the physical-chemical coagulation-flocculation process. The procedure is based on the use of aluminium and iron salts alone or in combination with the use of two flocculants; the first one is a biodegradable natural bioflocculant Opuntia cactus juice, and the second is the synthetic hydroxyapatite; to treat waste water collected at the entrance of the treatment plant, in the town of Saida. The flocculants were characterized using Fourier transform infrared spectroscopy, The influence of various experimental parameters, such as the amounts of coagulants and flocculants used, pH, turbidity, COD and BOD5, was investigated. The coagulation—flocculation jar tests of wastewater reveal that ferric chloride, containing a mass of 0.3 g hydroxyapatite is the most effective adjuvant in clarifying the wastewater, with turbidity equal to 98.16%. In the presence of the two bioflocculants, Opuntia cactus juice and aluminum sulphate, with a dose of 0.2 g, flocculation is good, with turbidity equal to 95.61%. The examination of the main parameters studied during the flocculation tests shows that the degree of pollution decreases, this is confirmed by the COD and the turbidity values. Analysis of these results suggests the use of these flocculants in wastewater treatment.

The objective of this study is to eliminate the pollutant load of wastewater from the STEP of Saida by the coagulation-flocculation tests using a jar-test bench. The analysis revealed a high COD and BOD5 content, which can reach 529.08 mg O2/l and 317.03 mg O2/l respectively. Conventional treatment based on coagulation-flocculation made it possible to reduce considerably this loading in the presence of the coagulant aluminum sulfate by means of natural flocculation auxiliaries, potato peels and bentonite. The efficiency of the treatment depends strongly on the optimization and control of all physico-chemical parameters. Turbidity is the best indicator of the effectiveness of this treatment. The optimal dose of aluminum sulphate is equal to 0.6 g, it is estimated at 10 mn, with a turbidity abatement of the order of 99.7%. The flocculation tests show that, with a mass of 0.5 g of bentonite and for an optimal dose of aluminum sulphate, the percentage reduction in turbidity is 99.66%. The treatment carried out in combination of aluminum sulphate and potato peels leads to good flocculation and clarification with a turbidity abatement of 98.01%. Examination of the results suggests the use of bentonite and potato peels as flocculation adjuvants.

The capacities of three Algerian clays as sorbents to remove acetamiprid insecticide from aqueous solutions were studied using a batch technique at room temperature. These clays were characterized using different methods, i.e. the X-ray fluorescence, FTIR spectroscopy, cation exchange capacity, and the specific area measurement. The static adsorption tests showed that the pH of the insecticide solutions, its temperature and agitation speed affect the adsorption process. Studies on acetamiprid retention showed that it is mainly influenced by the physicochemical properties of the clays used. Indeed, the adsorption results perfectly agree with the pseudo-second-order model, with very high regression coefficients (R2). The pH and temperature increase influences negatively the adsorption operation. A positive ΔG value indicates that the removal process is non spontaneous with clays. The adsorption isotherm data follow the Langmuir equation in which parameters were calculated. In addition, results show ...

In this work, Cd (II) adsorption from aqueous solutions was studied on three Algerian clays: bentonite, kaolin and clay of Djebal Debbagh. Using batch process, these materials were characterized by different methods infrared spectroscopy, X -ray fluorescence, measure of Cation Exchange Capacity (CEC) and specific area, the Adsorption tests were carried out at room temperature. The uptake of cadmium ions from aqueous solutions to the clays has been studied depending on contact time, temperature, agitation speed and pH, which was regarded as a principal factor in the analysis of the adsorption process. The contact time for the maximum adsorption required is 240m. The kinetics was correlated well with the pseudo second-order model. The results show that the uptake of Cd(II) increases with the pH increasing in the pH range of 2.0–12.0. The increase of the temperature negatively influences the process of the adsorption and shows physisorption phenomenon of cadmium ion on the tested materials. The studies on retention of cadmium ion showed that it is mainly influenced by the physico-chemical properties of used clays. Results show that sorption of cadmium ion was higher by bentonite clay than for other clays. In consequence, the tests allowed us to choose bentonite as the material that presents a capacity raised for the adsorption.