Studies on the application of ozone in the pilot-scale in-situ sludge reduction system
SUN Xiang-juan1, LIU Bin-han2, ZHANG Ling-jun2, Kyohei Aketagawa3, XUE Bin-jie4, REN Yin-ji4, BAI Jian-feng5, ZHAN Yong2, CHEN Si-si1, DONG Bin1
1. College of Environmental Science and Engineering, Tongji University, Shanghai 200092, China; 2. School of Environment and Architecture, University of Shanghai for Science and Technology, Shanghai 200093, China; 3. Mitsubishi Electric Corporation Advanced Technology R & D Center, Amagasaki-Shi, Hyogo 661-8661, Japan; 4. Mitsubishi Electric (China) CO., LTD. Shanghai Branch, Shanghai 200336, China; 5. WEEE Research Centre of Shanghai Second Polytechnic University, Shanghai 201209, China
Abstract：The effects of partial ozonation of returned sludge via high-and low-concentration ozone on effluent quality and sludge reduction rate in a pilot-scale system were explored. The pilot-scale system of anaerobic/anoxic/oxic(A/A/O)+ozonated sludge recycle(OSR) process was operated under 5 conditions for 183 days. This system showed superior operation performance when 20%of the total volume of returned sludge in the A/A/O module was treated by the dosage of 13 mg/g MLSS(25 mg/g MLVSS) per day.Under this condition, the COD, NH4+-N and TN of effluent could reach the first-class B standard of "Discharge standard of pollutants for municipal wastewater treatment plant"(GB18918-2002) with the treatment of both low-and high-concentration ozone(150 mg/L and 380 mg/L, respectively). In addition, compared with the low-concentration ozone treatment, the reduction in nutrients removal rate via high-concentration ozone treatment was lower, indicating the advantage of high-concentration ozone treatment in nutrients removal. The optimal SRT for low-concentration ozone treatment was 25 days, and the reduction rate of organic matters in excess sludge was 14.07%, and of total excess sludge was 8.33%. The optimal SRT for high-concentration ozone treatment was 75 days, and the reduction rates of organic matters and total excess sludge were 41.53% and 25.92%, respectively. At the same ozone dosage, the sludge reduction efficiency after high-concentration ozone treatment was obviously higher than that of low-concentration one. In addition, low temperature had no significant effect on the reduction rate and effluent quality when high-concentration ozone treatment was applied. Thus, the application of the "A/A/O+OSR" system was not significantly affected by temperature. The application of high-concentration ozone in WWTPs in this study provides practical guidance for the improvement of in-situ sludge reduction technology.
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