Removal Efficiency

Electro-coagulation (EC) is becoming a popular proc ess to be used for industrial wastewater treatment. In the present study, a laboratory scale electro-coagu lation (EC) process was utilized to treat the texti le wastewater in order to bring the quality up to the wastewater reu se standards and also to compare the electro-coagul ation process with the conventional coagulation treatment. Effect of various operating parameters such as operating time and voltage on COD removal efficiency was evaluated to achieve the maximum possible treatment efficiency.

Experimental investigations were conducted to evaluate the effectiveness of a retention treatment basin (RTB) with polymer coagulation for the treatment of combined sewer overflows (CSO) at high hydraulic loading rates. The TSS removal efficiency of the pilot-scale RTB at a surface overflow rate (SOR) of 11 m/h was approximately 35% without chemical addition, and 80% with a polymer dosage range of 5 to 10 milligrams per gram of influent TSS. The results demonstrated that the use of polymer coagulation significantly improved TSS removal and allowed the SOR in the RTB to be significantly increased, resulting in smaller treatment units. An empirical relationship was established to estimate removal efficiencies as a function of overflow rate. The results also compared settling characteristics of CSO, obtained from long column tests, to removal efficiencies in the high-rate RTB.

When fish are recovered from ponds, the effluent is often drained, presenting both an environmental challenge and an agricultural opportunity. The effects of irrigation with pond effluent and its interaction with applied fertilizer were assessed in a field experiment using French bean (Phaseolus vulgaris) and kale (Brassica oleracea) over two growing seasons near Sagana, Kenya. Fresh and dry matter yields

Electro-coagulation (EC) is becoming a popular proc ess to be used for industrial wastewater treatment. In the present study, a laboratory scale electro-coagu lation (EC) process was utilized to treat the texti le wastewater in order to bring the quality up to the wastewater reu se standards and also to compare the electro-coagul ation process with the conventional coagulation treatment. Effect of various operating parameters such as operating time and voltage on COD removal efficiency was evaluated to achieve the maximum possible treatment efficiency.

Water soluble chitosan, dissolved in hot deionized water to obtain 0.8% solution, was used for the coagulation-flocculation of skim natural rubber latex. The efficiency of coagulation-flocculation of skim rubber latex without pH adjustment was much poorer than that of neutral skim rubber latex. When adding chitosan solution to the neutral skim rubber latex with a rubber content of 5.300 %wt/vol until the concentration of chitosan in the dispersion was 0.107%, the phase separation between rubber particles and yellow serum was clearly observed. At this condition, the removal efficiency of skim rubber particles was found to be the best among all trials. It was also found that dilution of skim rubber latex with deionized water did not increase the removal efficiency. Key word : chitosan; skim rubber latex; coagulation; flocculation