This article presents the research results on kinetics of the biochemical process of oxygen consumption in the Cu De river from May to July, 2012. This is one of the important processes in selfpurification study and carrying capacity of biodegradable organic pollutants on the river basin. The experimental results were analysed base on pseudo-first order kinetic equation developed by Streeter &. Phelps. The correclated model was evaluated by using the Paired sample T-test method on the SPSS statistic analysis software. The results showed that the average biochemical rate coefficient had changed within 0.101-0.122 per day and activation energy (E) equals was 5.56Kcal. This indicated that nature of the aboved degration process of organic pollution is a mineralization process of organic bonds.
The electrically charged flocculation agent Kiyomaru was made on the basis of activating surface sand, clay, volcanic ash and then combined with strong electrical charge on the surface. Thus, it is the flocculant with natural and inorganic origin including 24.7% Na, 11.5% Al, 19.6% Si, 22.5% S, 1.8% K, 19.0% Ca and 0.9% Fe. The experimental results showed that the Kiyomaru is a flocculation agent with ability to treat the turbidity and suspended solid in the catfish farming waters with very high sedimentation rate and removal efficiency. The efficiency of turbidity removal is from 98.7% to 99.1%, while that for TSS removal is from 93.5% to 95.2% using 0.2 mg/L of the flocculation agent. Beside those, the agent can remove the organic matters (BOD, COD) from 21.4% to 26.7%, Total N from 32.4% to 33.9% and Total P from 85.4% to 89.3%. When the concentration of this flocculate agent is 0.2 g/L, turbidity treatment efficiency can range from 98.7% to 99.1%; TSS treatment efficiency can range from 93.5% to 95.2%. Besides, this flocculation agent is also capable of reducing 21.4%-26.7% of the organic matter, 32.4% to 33.9% of Total N and 85.4% to 89.3% of Total P.
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