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Farmland irrigation of city sewage treated by aerobic granular sludge |
Yan Ailan1, Qi Yiting1, Zheng Zhijin2 |
1.Institute of Hydraulic & Environmental Engineering, Zhejiang University of Water Resources and Electric Power, Hangzhou, Zhejiang 310018, China; 2.Huzhou Daxi Town Agricultural Service Center, Huzhou, Zhejiang 313023, China |
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Abstract The irrigation possibility of city sewage treated by aerobic granular sludge was explored. Results show that after the sewage was treated by aerobic granular sludge, the removal rates of CODcr and BOD5 in its effluents were 60% and 55% respectively; the removal rates of nitrogen and phosphorus were 50% and 53% separately;the removal rate of heavy metal was very high. The content of cadmium in the effluents was less than 1.0?10-5 mg/L. The Farmland Irrigation Water Quality Standard, whose value is less than 0.006 mg/L. Pb content in the effluents is 0.02 mg/L, less than the standard value of 0.1 mg/L. And the contents of other heavy metals, such as zinc, copper, mercury, chromium in the effluents were also much lower than the content values in the standard. So, the effluents of city sewage treated by aerobic granular sludge could be applied to farmland irrigation, and the indexes of CODCr,BOD5 nitregen,phosphorus,and other heavy metals in the effluents fully meet the requirements of the standard of the Farmland Irrigation Water Quality.
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Received: 30 January 2015
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