Search

This study aimed to prepare and characterize biochars from Textile and Food industry sludges set at 300 °C, 400 °C, and 500 °C. The residence time was 2 hours for each treatment with nitrogen flow. Biochar yields were decreased by increasing pyrolysis temperature. The parameters such as pH, Electric Conductivity (EC), Carbon/Nitrogen ratio, Total Phosphorus (TP), and Total Potassium (TK) increased with increased pyrolysis temperature. The pH values of textile sludge increased from 6.96 to 7.08, 7.13, respectively, with the increase in pyrolysis temperature. The total phosphorus content 71.75 ppm was found for biochar produced from food industry sludge at 300 °C pyrolysis temperature, and the highest TP value of 170.75 ppm was found for biochar produced from food industry sludge at 500 °C pyrolysis temperature. The TK value of biochar produced from the Food industry sludge was also increased by increasing pyrolysis temperature and ranged from 3277.77 ppm to 3494.72 ppm. The ATR- FTIR identified functional groups O–H, C–H, C–O, and CC from the fingerprint region. This work demonstrates that the thermal conversion of industrial sludge to biochar is a sustainable, cost-effective, and environmentally friendly management approaches.

This paper reviews the present state of nuclear power infrastructure of Bangladesh. It describes how Bangladesh is progressing towards nuclear power. The major infrastructure issues about the way in which to implement the country’s first nuclear power project have been identified and analysed. The domestic education and training infrastructure of the nuclear power sector of the country has been reviewed and it is regarded as the most critical challenge to commence the nuclear power programme in the country. A broad-based academic and research capability in nuclear science and engineering disciplines and the professional educational and training courses for different tiers of professionals and staff of the Nuclear Power Plant (NPP) operating organisation and nuclear regulatory authority needs to be strengthened for the sustainable development of the nuclear power sector as well as the economic operation of nuclear power facilities of the country. An approach to the manpower development for the national nuclear power sector has also been proposed.

To assess the magnitude of water quality decline in the Turag River of Bangladesh, this study examined the seasonal variation of physicochemical parameters of water, identified potential pollution sources, and clustered the monitoring months with similar characteristics. Water samples were collected in four distinct seasons to evaluate temperature, pH, dissolved oxygen (DO) concentration, five-day biochemical oxygen demand (BOD5), chemical oxygen demand (COD), electrical conductivity (EC), chloride ion (Cl−) concentration, total alkalinity (TA), turbidity, total dissolved solids (TDS) concentration, total suspended solids (TSS) concentration, and total hardness (TH) using standard methods. The analytical results revealed that 40% of water quality indices were within the permissible limits suggested by different agencies, with the exception of EC, Cl−concentration, TA, turbidity, DO concentration, BOD5, and COD in all seasons. Statistical analyses indicated that 52% of the contrasts were significantly different at a 95% confidence interval. The factor analysis presented the best fit among the parameters, with four factors explaining 94.29% of the total variance. TDS, BOD5, COD, EC, turbidity, DO, and Cl−were mainly responsible for pollution loading and were caused by the significant amount of industrial discharge and toxicological compounds. The cluster analysis showed the seasonal change in surface water quality, which is usually an indicator of pollution from rainfall or other sources. However, the values of different physicochemical properties varied with seasons, and the highest values of pollutants were recorded in the winter. With the change in seasonal temperature and increase in rainfall, the seasonal Turag River water followed a self-refining trend as follows: rainy season > pre-winter > summer > winter.

•Elemental abundances of soil & water samples from a southern part of Bangladesh are presented.•Natural radioactivity of soil & physicochemical parameters of water samples are reported.•Base-line data for our studied pre-industrial area (Rampal) has been established.•Statistical approaches have been used to assess the measured analytical data.•Using environmental and radiological indices environmental geochemistry has been evaluated.