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Study on release amounts and the control of GHG from wastewater treatment using natural systems.

利用自然系统处理废水的温室气体排放量和控制研究。

基本信息

批准号：
15560479
负责人：
MIZUOCHI Motoyuki
金额：
$ 1.98万
依托单位：
National Institute for Environmental Studies
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (C)
财政年份：
2003
资助国家：
日本
起止时间：
2003 至 2005
项目状态：
已结题

来源：
https://kaken.nii.ac.jp/en/grant/KAKENHI-PROJECT-15560479/
关键词：
Wastewater treatment using natural systems Methane Nitrous oxide Domestic wastewater Lagoon Soil treatment Constructed wetland Greenhouse effect 自然利用型排水処理プロセス

项目摘要

This research aimed at clearing methane and the nitrous oxide release mounts from the wastewater treatment process using natural system such as the artificial lagoon which it can think about with a big source of these gases and a discharge mechanism in the relations with terms of operational condition and got the following result.CH4 discharge excelled in the lagoon at the treatment first half, and relation with the photosynthesis period was recognized as the N2O discharge. Moreover, suitable range of ORP was recognized, and it almost aligned with the range that nitrification and denitrification process at the same time in N2O. A conversion coefficient to inflow nitrogen was mostly estimated at about 1%. The CH4 change rate of inflow carbon was estimated at about 45%, and the height of the discharge potential was shown by the field investigations done in the Philippines.A difference in the release amounts by vegetations was recognized in the constructed wetland. Moreover, the CH4 concentration which occurred in the soil surface part showed a tendency to decrease, and it could think with the influence of the bacteria that CH4 which accumulated it in the soil oxidizes by the permeation-type treatment. The tendency that the release amount of CH4 of surface flow type grew big in comparison with the permeation-type was recognized. And, a CH4 conversion rate was estimated at 10-20% by the field investigations done in China.Relations with the ORP concentration were recognized as both CH4 and N2O in the soil by the soil treatment. Specially, the existence of suitable territory of ORP was shown about the discharge of N2O. The introduction of a small quantity air was examined as a discharge reduction technique from these results, and about 50% of effect on repression of discharge was admitted as both CH4 and N2O.It does as an amount of activities which is necessary for the GHG discharge quantity estimation China urine flow calculation necessary investigation.

本研究针对污水处理过程中甲烷和一氧化二氮的排放问题，采用人工泻湖等天然系统对这些气体的大量来源和排放机理与运行条件的关系进行了研究，得到了以下结果：在处理前半段，CH4的排放优于泻湖，与光合作用时期的关系被认为是N2O的排放。此外，还确定了ORP的适宜范围，它与N2O中硝化和反硝化同时进行的范围基本一致。对流入氮的转换系数大多估计在1%左右。在菲律宾进行的实地调查表明，入渗碳的CH4变化率约为45%，排放潜力的高度。在人工湿地中，植被的释放量存在差异。此外，土壤表层的CH4浓度呈下降趋势，可以认为在细菌的影响下，土壤中积累的CH4被渗透式处理氧化了。与渗透型相比，表面流型甲烷的释放量有增大的趋势。在中国的野外调查中，甲烷的转化率估计为10-20%。土壤处理与土壤中有机磷浓度的关系被认为既是甲烷又是N2O。特别是，对于N2O的排放，ORP存在着合适的区域。从这些结果中考察了引入少量空气作为一种减少排放的技术，大约50%的抑制排放的效果被认为是CH4和N2O。作为估算温室气体排放量所必需的活动量，中国尿流计算进行了必要的研究。