Purification of agricultural waste water by pooling in an irrigation tank

通过汇集在灌溉池中净化农业废水

基本信息

批准号：
11660240
负责人：
HIRAMATSU Ken
金额：
$ 1.28万
依托单位：
Kyoto University
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (C)
财政年份：
1999
资助国家：
日本
起止时间：
1999 至 2001
项目状态：
已结题

项目摘要

In recent years, there are some experiments to purify the agricultural wastewater that includes much nutrients and suspended solids by pooling it temporally in irrigation tanks. It certainly purify the water, however, its mechanism and quantitative ability is still unidentified. The aim of this research is to makes them clear.Water quality of an irrigation tank called "Higashi-ike" that is located in Minakuchi, Shiga prefecture has been investigated during 2000-2001. The indices of water quality are phosphorus, nitrogen, chlorophyll-a, and so on. The results show that phosphorus of 11.9kg and nitrogen of 37.61kg have flowed into the irrigation tank and about 50 % and 7.5 % of them have stayed as residuals in the irrigation tank, respectively. The rate of residuals is quite high, compared with past researches. It may be mainly because the tank pools the agricultural wastewater and therefore its concentration of nutrients sometimes becomes extremely high.This result is only a case of small irrigation tank, however, the residual of nutrients may be substantial amount, when summing them of many irrigation tanks in Japan.And the effects of bio-manipulation by shells and drainage are also examined. Both have certainly enhanced the ability of purification, however, their degrees have unfortunately not become apparent through these experiments.In addition classification of irrigation tanks is exequted to grasp the characteristics of irrigation tanks in Minakuchi region. It shows that tanks in this region are classified into 4 categories.

近年来，有一些实验可以净化农业废水，其中包括大量营养和悬浮固体，通过将其暂时地在灌溉罐中汇集。它肯定会净化水，但是，其机制和定量能力仍然不明。这项研究的目的是使它们清晰。水质的指标是磷，氮，叶绿素-A等。结果表明，磷的磷和37.61千克的氮分别流入了灌溉罐中，其中约50％和7.5％的磷在灌溉罐中的残留物分别保持为残留物。与过去的研究相比，残留率很高。这可能主要是因为储罐池将农业废水池填充，因此其营养素的浓度有时会变得极高。这只是一个小灌溉水箱的情况，但是，当日本的许多灌溉罐中汇总营养的残留物可能是大量的。日本的许多灌溉水箱以及壳和排水的生物启动的影响。两者肯定都增强了纯化的能力，但是，不幸的是，通过这些实验，它们的学位并不明显。在对灌溉罐的加法分类中，可以掌握Minakuchi地区的灌溉罐的特征。它表明该地区的坦克分为4个类别。