The present study was based on performance evaluation of Common Effluent Treatment Plant (CETP) and optimization of chemical dosing in the plant. Flowbased composite sampleswere collected fromcollection tank, primary clarifier, secondary clarifier, aeration tank and final treated water. Testing was required to obtain the following necessary design and operating parameters pH, chemical oxygen demand (COD), total dissolved solid (TDS), total suspended solids (TSS), settling time (Min.) sludge generation (Volume). Total volume of sample was to monitor the treatment efficiency at different stages of treatment plant. Collected samples were analyzed in the laboratory. Water qualitywas determined after treating thewastewater with combination of physicochemical treatment.The study of the coagulation-flocculation process using various commercially available coagulants such as lime, ferrous sulphate and alum.Optimization pH and chemical concentration in the jar-tests. Performance and optimization of chemical dosing, doing trials with lime&FeSO4 on the inletwater. Experimentswere performed to replace FeSO4 with alum. Treatibility study using lime with alum gave maximum reduction in COD, color with minimum sludge generation, as compared with FeSO4. From the experiments it was observed that, optimized dose of lime should be increased to 8 - 12mg/l and the existing dosing of alum60 - 85mg/ l to ensure proper removal of the suspended solids. Cost estimation was done, of the above coagulants after evaluating their performance. 2010 Trade Science Inc. - INDIA

This paper discusses on treating effluent in the textile Industry. Several countries, including India have introduced strict ecological standards. They are consumes large quantities ofwater and produces large volumes ofwastewater in processes.Wastewater from textile industry has a high or low pH, high temperature and a high concentration of organic materials. Removing color and organics from wastewater is more important because the presence of small amounts of dyes is clearly visible and detrimentally affects the water quality. Simple chemicals such as alum, lime or iron salts can be added to wastewater to cause heavier masseswhich can be removed faster through physical processes. The analysis results were depicted in the stage-wise performance of the ETP of inlet and outlet effluent quality. The receiving influent pH 7.25 and effluent pH was 7.8. The removal efficiency of total dissolve solids, total suspended solids, chemical oxygen demand and chloride was hardly to be 22.66%, 69.52%, 90.46%and 9.93%respectively. The results of the Treatability study have shown that alum dosing individually and in combination with lime can remove color and COD frommoderate to high degree of dose. 100 ppmof alumdose gives desired reduction of color and COD. 2010 Trade Science Inc. - INDIA