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

本研究旨在利用人工泻湖等自然系统清除废水处理过程中的甲烷和氧化亚氮释放量，可以考虑这些气体的大来源及其与运行条件的关系，并得到以下结果。在处理前半段，泻湖的CH4排放量较好，与光合作用期的关系被认为是N2O排放量。同时，确定了适宜的ORP范围，与N2O中同时进行硝化和反硝化过程的范围基本一致。对流入氮的转换系数大多估计在1%左右。流入碳的CH4变化率估计约为45%，在菲律宾的实地调查显示了排放势的高度。在人工湿地中，植被的释放量存在差异。土壤表层发生的CH4浓度呈下降趋势，可以认为在细菌的作用下，土壤中积累的CH4通过渗透型处理发生了氧化。表面流型CH4的释放量比渗透型CH4的释放量有增大的趋势。通过野外调查，估计CH4的转化率为10-20%。土壤处理确定了土壤中CH4和N2O与ORP浓度的关系。特别是在N2O的排放上，ORP存在一个合适的范围。根据这些结果，对引入少量空气作为减排技术进行了研究，其中约50%的减排效果被认为是CH4和N2O。作为温室气体排放量估算所必需的活动量，中国尿流量计算是必要的调查。

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.