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Study on the Development of Nitrogen Removal Technology for Livestock Wastewater by intermittent Aeration Processes

畜牧废水间歇曝气脱氮技术开发研究

基本信息

批准号：
07555460
负责人：
SUDO Ryuichi
金额：
$ 3.97万
依托单位：
TOHOKU UNIVERSITY
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (A)
财政年份：
1995
资助国家：
日本
起止时间：
1995 至 1997
项目状态：
已结题

来源：
https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-07555460/
关键词：
Livestock wastewater Intermittent aeration process Nitrogen Nitrification Denitrification 亜酸化窒素ガス

项目摘要

Although the pollutant load of livestock wastewater, especially pig-house wastewater, is very high, the wastewater is not sufficiently treated and is discharged to public water areas. It is essential to reduce the pollutant load, in particular, the nutrient such as nitrogen and phosphorus in livestock wastewater for the conservation of water environment. The objective of this study was to establish a system to simultaneously treat the organic substance and nitrogen of livestock wastewater by using intermittent aeration process based on the field survey, laboratory and pilot-plant experiments. After optimum conditions were determined from laboratory experiment using sequencing batch activated sludge processes, 20,000-liter bio-reactor was built in the field as pilot-plant apparatus. The results obtained in this study are as follows :(1) BOD removal nitrification are effectively carried out if MLSS is 3000mg/l, raw BOD 350mg/l and T-N 450mg/l under intermittent aeration with 4-hour aerobic and 4-hour anaerobic conditions. Denitrification was recognized if methanol was added and the target water quality were obtained.(2) Many specific micro-animal were observed from the bioreactor, and it suggested that these micro-animals could be used as index for evaluating the treatment efficiency.(3) BOD and T-N were simultaneously removed and the removals are 96% and 94%, respectively, from pilot-plant experiment. Whereas the removal of phosphorus was 33%, suggesting that other treatment process be needed to remove phosphorus.

虽然畜禽废水，特别是猪舍废水的污染物负荷非常高，但废水没有得到充分处理，排放到公共水域。降低畜禽废水中的污染物负荷，特别是氮、磷等营养物质的负荷，对保护水环境至关重要。本研究旨在通过实地调查、室内试验和中试试验，建立间歇式曝气工艺同时处理畜禽废水中有机物和氮的系统。采用顺序批式活性污泥法进行室内试验，确定最佳工艺条件后，在现场建造了2万升生物反应器作为中试装置。本研究结果如下：(1)间歇曝气4小时好氧和4小时厌氧条件下，当MLSS为3000mg/l，生BOD为350mg/l， T-N为450mg/l时，可有效去除BOD硝化。如果加入甲醇，则可以识别脱氮，并达到目标水质。(2)从生物反应器中观察到许多特定的微动物，这些微动物可以作为评价处理效果的指标。(3)中试试验同时去除BOD和T-N，去除率分别为96%和94%。而磷的去除率为33%，说明需要采用其他处理工艺进行除磷。