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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，以净化农业废水，其中包括大量的营养物质和悬浮物，它暂时汇集在灌溉槽。它确实具有净化水质的作用，但其作用机理和定量能力尚不清楚。2000 ~ 2001年对位于滋贺南口市的一个名为“东池”的灌溉水池的水质进行了调查。结果表明，有11.9kg的磷和37.61kg的氮流入灌溉池，其中约50%和7.5%的氮以残留形式留在灌溉池中。与以往的研究相比，残差率相当高。这可能主要是因为水池中汇集了农业废水，因此其营养物浓度有时会变得非常高。这一结果仅是小型灌溉水池的情况，但是，如果将日本的许多灌溉水池的营养物总量相加，则营养物的残留量可能相当大。此外，还检查了通过贝壳和排水进行生物操纵的效果。这两种方法确实提高了净化能力，但遗憾的是，通过这些实验，它们的程度并不明显。此外，为了掌握水口地区灌溉水箱的特点，对灌溉水箱进行了分类。它表明，该地区的坦克分为4类。