Blind sewage irrigation has caused the accumulation of poisonous and harmful substance in some regional soils and water sources,and environment has also been polluted in varying degrees,so that it has threated people health seriously in some region.

• 盲目的污水灌溉导致一些地区土壤、水源中有毒有害物质积累，环境受到不同程度的污染，在有些地区已经严重威胁了人类的健康。