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Tham khảo tài liệu 'waste water treatment and reutilization part 6', kỹ thuật - công nghệ, cơ khí - chế tạo máy phục vụ nhu cầu học tập, nghiên cứu và làm việc hiệu quả | Excess Sludge Reduction in Waste Water Treatment Plants 139 3. The activated sludge which had gathered in the settling tank was sent back to the aeration tank by a pump Roller Pump Furue Science Co. for a fixed period of time. It is to be noted that magneto-ferrite effect is applied on system 2 whether another system was kept without any of the treatment. 4. In order to verify the effect of the magneto-ferrite treatment the MLSS was measured periodically for the each of the aeration tanks. The excess sludge was removed if necessary then dried and measured the amount of the sludge. 5. The COD of the effluent was measured periodically by a COD meter and COD removal efficiency was calculated. The experiments were performed to make clear the effect of the magneto-ferrite treatment so the major conditions were kept same for both WWTPs system 1 and system 2. However the values of MLSS of the two aeration tanks were little different at the initial stage which was not so big in amount and was acceptable. The ingredients of the artificial influent were as follows 1. Peptone Becton Dickinson and Co. 0.5g L 2. Glucose Kanto Chemical Co. 0.5g L 3. Yeast Becton Dickinson and Co. 0.25g L 4. Ammonium Dihydrogenphosphate NH 4 H2 PO 4 Kanto Chemical Co. 7mg L 5. 25 Ammonia water Wako Pure Chemical Industries Ltd. 1mL L 6. The pH values 6-8.5 were measured regularly of the activated sludge and controlled the value with NaOH Nacalai Tesque dropping if needed. Fig. 5. Model diagram of two laboratory WWTPs 140 Waste Water - Treatment and Reutilization CAS EA BOD-Sludge Loading 0.40 0.15 BOD-Volume Loading 0.20 0.05 MLSS mg L 2000 3000 COD of Influent mg L 300 150 Amount of Influent L d 4.48 3.36 Aeration rate L min 3.00 3.00 Table 1. The factors for the reduction of excess sludge The COD of the influent was controlled at 300mg L for both systems for CAS method. It was 150mg L for EA method. The magneto-ferrite treatment device was run for 12h d. The ability of the return pump was fixed
