Abstract
The objectives of this research are to study about influence of calcium hypochlorite dosage adjustment on tapioca wastewater chlorination toward efficiency of activated sludge treatment especially at MLVSS profile and percentage of COD removal. This research mainly divided into pre-chlorination and activated sludge treatment. Pre-chlorination taken place for 60 minutes at pH 8. The variation of calcium hypochlorite dosages which used are 58, 59, and 60 mg/L. Pre-chlorination effluent with no free chlorine residual then becomes activated sludge treatment influent. Sampling has done each aeration time interval 0, 2, 4, and 6 hour for analysis of COD and MLVSS content. Research result generally shows that addition of aeration time for each variation of calcium hypochlorite dosage will increase MLVSS and decrease COD content. Smallest value of COD effluent could achieved in the activated sludge treatment with calcium hipochlorite dosage 60 mg/L addition at influent during 4 hours aeration time. Addition of 58 mg/l calcium hypochlorite results highest MLVSS and percentage of COD removal.
Highlights
The application of aerobic treatment for handling wastewaters containing COD over 4000 mg/L can not produce effluents that comply with effluent discharge limit there exist cross over points, ranging from 600 to 1400 mg/L influent wastewater COD, which are crucial for effective functioning of aerobic treatment systems (Chan, Chong, Chung, & Hassel, 2009)
Especially activated sludge treatment, are the most commonly used in the treatment of organic wastewaters for achieving high degree of treatment efficiency
Aerobic systems are suitable for the treatment of wastewaters containing COD less than 1000 mg/L
Summary
Range of the organic content of this waste is about 3000-7500 and 700030000 mg/L, respectively in Biological Oxygen Demand (BOD5) and Chemical. If they are not properly treated before the disposal into receiving water body, some significant environmental hazards such unpleasant smell, oxygen depletion, and unbalance of aquatic biota will occur (Setyawati, Hirayama, Kaneko, & Hirayama, 2011). Activated sludge treatment could remove organic content in wastewater significantly only at the short time. Operation of this aerobic wastewater treatment method during five hours aeration able to decrease COD content in tapioca wastewater from initial condition, approximately 3000 mg/L, until meet the standard quality (Santoso, 2010). The application of aerobic treatment for handling wastewaters containing COD over 4000 mg/L can not produce effluents that comply with effluent discharge limit there exist cross over points, ranging from 600 to 1400 mg/L influent wastewater COD, which are crucial for effective functioning of aerobic treatment systems (Chan, Chong, Chung, & Hassel, 2009)
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