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模拟改善污水处理率对日本水生生物生态状况的影响

Toyohiko Nakakubo¹, Midori Kawabata², Yuriko Ishikawa³

¹Division of Sustainable Energy and Environmental Engineering, Graduate School of Engineering, Osaka University, 2-1 Yamadaoka, Suita, Osaka 565-0871, Japan.

|November 3, 2023

概括

在日本,改善污水处理有助于改善河流的健康状况. 升级家庭废水处理系统和增加污水连接大大减少有机污染,保护水生生物.

科学领域:

环境科学环境科学
水质管理水质管理
生态毒理学生态毒理学

背景情况:

未经处理的灰色水排放会影响日本河流中的水生生物的健康.
日本目前的污水处理率低于100%,需要改善政策.
两个关键措施包括增加家庭连接到污水系统和升级现场废水处理系统 (OWTS).

研究的目的:

为了估计改善的污水处理率对日本冈马县河流水质量的影响.
使用基于水文学的方法建模生化氧需求 (BOD).
根据污染水平评估河流的生态状况.

主要方法:

开发了一个250米的基于水文学的模型来估计河流BOD.
模拟了三个污水处理率的场景:75.2% (A场景),88.2% (B场景) 和100% (C场景).
评估了河流生态状况,使用Ephemeroptera,Plecoptera和Trichoptera的分类丰富度作为BOD的指标.

主要成果:

据估计,群马县的有机污染 (BOD III-IV级) 在A场景下降了25%,在B场景下降了62%,在C场景下降了97%.
在小分支河流中,改善最为显著.
改善的处置率在人口密集地区更有效,在已建立的污水系统之外,具有单一类型的OWTS.

结论:

升级OWTS和扩大污水连接是减少河流有机污染的有效策略.
在人口密度高且依赖单一类型的OWTS的地区进行有针对性的改进,可以带来大量的水质益处.
实现100%的污水处理对于恢复日本河流环境的生态健康至关重要.

关键词:

巨大的无脊椎动物在现场的废水处理系统.有机污染有机污染情景分析是指对情景进行分析.污水管道连接连接的下水道.

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