Transformation of nitrogen and production of nitrous oxide in an estuary receiving treated wastewater

接受处理过的废水的河口中氮的转化和一氧化二氮的产生

• 批准号: 09450198
• 负责人: KUSUDA Tetsuya
• 金额: $ 8.7万
• 依托单位: KYUSHU UNIVERSITY
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Scientific Research (B)
• 财政年份: 1997
• 资助国家: 日本
• 起止时间: 1997 至 1999
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-09450198/
• 关键词: Treated wastewater; Estuary; Transformation of nitrogen; Nitrous oxide; Field survey; Nitrification; Denitrification; Dissolved oxygen; 一酸化二窒素; 咸潮域; 脱室; 遊存酸素; 底泥; ガスフラックス; 河川感潮部; 干潟; 河口; ガス輸送係数

Transformation of nitrogen compounds and the production of NィイD22ィエD2O were investigated in an estuary, the Tatara estuary in Fukuoka, receiving the load from two wastewater treatment plant. Conclusions obtained in this study are as follows :1) Loading from the wastewater treatment plants to the estuary brings severe impacts through the production of NィイD22ィエD2O ;2) Nitrous oxide originated from treated wastewater and sediments ;3) The major production sites of NィイD22ィエD2O in sediments were in the midstream of the Tatara estuary ;4) Nitrification is a possible source of NィイD22ィエD2O especially in low temperature season ;5) The highest concentrations of NィイD22ィエD2O in water bodies at the observation stations raged from 1.8 to 20.9μM ;6) Nitrous oxides has been oversaturated in the water bodies and sediments and its flux to the atmosphere is about 1.07 MmolNkmィイD1-2ィエD1yィイD1-1ィエD1 in this estuary ;7) The emission rate of NィイD22ィエD2O to the atmosphere is as same order of magnitude as its net production rate in the estuary ;8) The temporal increases in production rate of NィイD22ィエD2O were found in the denitrification process following the onset of anaerobic conditions ;9) When temperatures in the culture was shifted up, the temporal increase of NィイD22ィエD2O in production rates were found.

在福冈塔塔拉河口两个污水处理厂的负荷下，研究了氮化合物的转化和N-ィイ-D22-ィエ-D2O的产生。研究结果表明：1)污水处理厂对河口N-ィイD22-ィエD2O的排放产生了严重影响；2)处理后的污水和底泥中产生了大量的氧化亚氮；3)底泥中N-ィイ-D22-ィエ-D2O的主要产生地在塔塔拉口中游；4)硝化作用是N-ィイ-D22-ィエ-D2O的一个可能来源，尤其是在低温季节；5)观测站水体中N-ィイ-D22-ィエ-D2O的最高浓度在1.8-20.9μM之间；6)亚硝酸盐在水体和沉积物中已经过饱和，其向大气的通量约为1.07MmolNkmィイD_1~(-2)ィエD_1yィイD_1~(-1)ィエD_1，7)N_(ィイ)D_(22)ィエ_2O向大气的排放速率与其在河口的净生产量相同的数量级，8)N_ィイ_(22)ィエ_2O的产生量在厌氧条件开始后的反硝化过程中随时间的增加而增加；9)随着培养温度的升高，N-ィイ-D22-ィエ-D2O的产生率随培养温度的升高而增加。