Nitrogen pollution of leachate at a sea-based solid waste disposal site and its nitrification treatment by immobilized acclimated nitrifying sludge |
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| Institution: | 1. Department of Environmental Engineering, Faculty of Engineering, Osaka University, 2-1 Yamadaoka, Suita-shi, Osaka, Japan;2. Osaka City Institute of Public Health and Environmental Sciences, Tohjoh-cho 8-34, Tennhoji-ku, Osaka 543, Japan;1. Faculty of Chemical Engineering, Kunming University of Science and Technology, Kunming, 650500, PR China;2. Yunnan Provincial Key Laboratory of Energy Saving in Phosphorus Chemical Engineering and New Phosphorus Materials, Kunming, 650500, PR China;3. The Higher Educational Key Laboratory for Phosphorus Chemical Engineering of Yunnan Province, Kunming, 650500, PR China;1. Graduate Institute of Environmental Engineering, National Taiwan University, No. 1, Section 4, Roosevelt Road, Taipei City 10617, Taiwan;2. Institute of Combustion and Power Plant Technology, University of Stuttgart, Pfaffenwaldring, 23, Stuttgart 70569, Germany;3. Institute of Nuclear Technology and Energy Systems, University of Stuttgart, Pfaffenwaldring, 31, Stuttgart 70569, Germany;4. Department of Chemical Engineering and Biotechnology, National Taipei University of Technology, No. 1, Section 3, Zhongxiao E. Road, Taipei City 10608, Taiwan |
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| Abstract: | It was found that changes in the nitrogen concentration of leachate from the Osaka North Port sea based disposal site were closely related to the way in which dumping was carried out. The nitrogen concentration of the leachate was low due to the low nitrogen content and slow nitrogen dissolution rate of materials dumped previously in the landfill. The dumping of incinerator ash, noncombustible garbage, waterworks sludge and incinerated ash from sewage sludge were followed, and it was found that they caused a sharp increase in nitrogen concentration in the leachate. The main nitrogen form of leachate was NH4-N, and its concentration reached 50 mg/l after 6 years of landfilling. Successful nitrification treatment of leachate (more than 80% nitrification) was possible by using polyvinyl alcohol immobilized acclimated marine nitrifying sludge with an NH4-N loading rate of 2.9 mg-NH4-N/g-pellets/d. Low NO2-N was detected throughout the continuous nitrification experiments, so the rate limiting step in the nitrification treatment was revealed to be a nitrification step (NH4+→NO2?). The addition of inorganic carbon to the test leachate enabled us to perform nitrification treatment even with a high NH4-N loading rate. Dolomite limestone was shown experimentally to be able to replace inorganic chemicals. |
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