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Chemically enhanced primary treatment of textile industrial effluents

100%
Mahmoud E. K.
Polish Journal of Environmental Studies
|
2009
|
tom 18
|
nr 4
651-655
Textile industries consume substantial volumes of water and chemicals for wet processing of textiles. Effluent discharge from textile industries to neighbouring water bodies and wastewater treatment systems is currently causing significant health concerns. Chemically enhanced primary treatment (CEPT) involves the use of chemical coagulants to enhance the coagulation or flocculation of wastewater particles. The chemicals of aluminum sulphate (alum), ferric chloride (FeCl₃) and cationic polymer were studied by jar test to select the most suitable coagulant for effective treatment of textile industrial effluents. The results showed that the optimum dosage for the removal of 75% of colour, 64% turbidity and 69% of chemical oxygen demand (COD) was 300 ppm of alum after pH adjustment at pH = 7.2. An experiment further revealed that the addition of 300 mg l⁻¹ of alum and 1 mg l⁻¹ of polymer could provide a reduction of colour, turbidity, COD and phosphorous higher than 95%, 75%, 76% and 90%, respectively. The experimental results confirmed that CEPT can be adopted as a decolorization of textile industrial effluents. Moreover, it can improve sludge setting and dehydration properties, and decrease the treatment cost.
2
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Effects of vermicompost and water treatment residuals on soil physical properties and wheat yield

51%
Mahmoud I. M., Mahmoud E. K., Doaa I. A.
International Agrophysics
|
2015
|
tom 29
|
nr 2
The application of vermi compost and water treatment residuals to improve the physical properties in the salt affected soils is a promising technology to meet the requirements of high plant growth and cost-effective reclamation. Therefore, the aim of this study was to investigate the effect of vermi compost and its mixtures with water treatment residuals on selected physical properties of saline sodic soil and on wheat yield. The treatments were vermi compost, water treatment residuals, vermi-compost + water treatment residuals (1:1 and 2:1 wet weight ratio) at levels of 5 and 10 g dry weight kg-1 dry soil. The conside-red physical properties included aggregate stability, mean weight diameter, pore size distribution and dry bulk density. The addition of vermi compost and water treatment residuals had significant positive effects on the studied soil physical properties, and improved the grain yield of wheat. The treatment of (2 vermi compost + 1 water treatment residuals) at level of 5 g kg-1 soil gave the best grain yield. Combination of vermi compost and water treatment residuals improved the water treatment residuals efficiency in ameliorating the soil physical properties, and could be considered as an ameliorating material for the reclamation of salt affected soils.
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