Shortage of water,pollution of tributary waters and incretion of sewage irrigation for farmland make the potentiality impact on environment and safety of agricultural products.

• 适当处理的城镇生活污水是一种稳定的水资源、在很大程度上缓解水资源的紧缺状况,利用污水资源的主要用途之一是灌溉农田。