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| Characteristics of nitrogen removal from nylon-6 wastewater in hydrolysis acidification-submerged biofilm process |
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LIU Fang1,ZHAO Chao-cheng1,ZHANG Xiu-xia1,LIU Guo-hua2
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(1. College of Chemistry and Chemical Engineering in China University of Petroleum,Dongying 2570611Shandong Province, China;2. Environmental Science and Engineering College in Donghua University, Shanghai 200051，China)
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| Abstract: |
| A hydrolysis acidification-submerged biofilm system was selected for nylon-6 wastewater treatment. The effects of influent organic loadings on chemical oxygen demand ( COD) and total nitrogen (TN) removal was investigated, and the characteristics of nitrogen removal were also analyzed. As influent organic loadings varied from 1.37 kg ? m'3 d"1 to 3.95 kg m_3 d_1, COD removal efficiency became relatively steady t while TN removal efficiency first increased and then decreased. The transformation of nitrogen is affected by nitrification, denitrification, ammonificatin, hydrolysis and acidification in the hydrolysis acidification reactor, and aerobic denitrification reaction is contributed to nitrogen removal in submerged biofilm reactors. |
| Key words: nylon wastewater hydrolysis acidification submerged biofilm biological nitrogen removal |
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