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Planned Reuse of Domestic Wastewater in Rural Area

农村生活污水有计划回用

基本信息

批准号：
09460109
负责人：
HARUTA Shinsuke
金额：
$ 3.39万
依托单位：
Ehime 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 2000
项目状态：
已结题

来源：
https://kaken.nii.ac.jp/en/grant/KAKENHI-PROJECT-09460109/
关键词：
Reuse of Treated Wastewater Rural Sewerage Nitrogen Phosphorus Recycle

项目摘要

Firstly, the review of the research was conducted. Secondly, in order to define the actual status of the reuse of the treated wastewater from rural sewerage for agriculture, representative 18 rural sewerage and 4 public sewerage were investigated. Main findings are : 1) The main purpose was the prevention of the water shortage. Fertilizer effect of the treated wastewater and the water purification function of the farmland were not considered. 2) The treated wastewater was mainly utilized for paddy fields. 3) In many cases, the reuse were practiced throughout the irrigation season every year. 4) The sending systems of the treated wastewater for the farmland were very diverse. 5) The planning conditions of treated wastewater were determined without the consideration for the reuse. 6) A wide variety of treatment systems was employed. The problems for these conditions of the reuse were also defined. Thirdly, investigations of the "O area" in Ehime prefecture were conducted, where the treated wastewater reuse for paddy fields was actually practiced. In the area, the treated wastewater was diluted in the irrigation pond or by river water. Main findings are : 1) The reuse resulted in the ordinary harvest of rice plants under the general conditions of the fertilization and the utilization of agricultural chemicals. 2) The number of coliform groups and heterotrophes in treated wastewater were smaller than the natural water in this area : e.g. river water. 3) The purification function of paddy fields were effective for NOx-N.4) The sending of the treated wastewater to the pond resulted in the increase of the volume of over flow water. This condition led to the reduction of labor for management of the water gate of the pond. 5) The treated wastewater sent to the pond were tended to be not completely mixed and to be remained in the depth of 1-2m in the summer season. The reason of the retention was also clarified.

首先，对相关研究进行了综述。其次，为了明确农村污水处理后回用于农业的实际情况，对具有代表性的18个农村污水和4个公共污水进行了调查。主要研究结果如下：1)主要目的是预防缺水。未考虑污水处理后的肥料效应和农田的净水功能。2)处理后的废水主要用于稻田。3)在许多情况下，每年的灌溉季节都在进行再利用。4)农田污水处理后排放方式多样。5)在没有考虑回用的情况下，确定了污水处理后的规划条件。6)采用了多种处理系统。并对这些重复利用条件下存在的问题进行了界定。第三，对爱美州“O区”进行了实地考察，在那里进行了稻田污水处理回用的实践。在该地区，处理后的废水在灌溉池塘中或被河水稀释。主要研究结果如下：1)在施肥和农用化学品利用的一般条件下，再利用可使水稻植株达到正常收割。2)处理后的污水中的大肠菌群和异养菌数量均少于该地区的天然水，如河水。3)稻田对NOx-N有较好的净化作用。4)处理后的污水排入池塘，导致溢流水体积增大。这种情况导致了池塘水门管理的劳动力减少。(5)夏季入池污水趋于不完全混合，停留在1~2m深度。并对滞留原因进行了分析。