1、 Engineering overview;

Rural drinking water safety refers to the timely and convenient access of rural residents to sufficient, clean, and affordable drinking water. Rural drinking water safety includes water quality, quantity, convenience of water use, and water supply guarantee rate4Evaluation indicators.

（1）Water quality: should comply with the "Sanitary Standards for Drinking Water"（GB5749）The requirements. Rural drinking water safety first refers to the safety of drinking water. Safe drinking water refers to drinking water that a person consumes throughout their lifetime without causing harm to their health. According to the definition of the World Health Organization, lifelong drinking is based on the average life expectancy70Based on years, per person per day2LCalculation of drinking water. In addition, safe drinking water should also include daily personal hygiene water, such as washing face, bathing, rinsing mouth, etc. If harmful substances are present in water, they may enter the human body through skin contact, respiratory absorption, and other means during bathing or rinsing, thereby affecting human health.

（2）Water quantity: able to meet people's reasonable drinking water needs. Mainly providing drinking water for farmers' daily life, taking into account the water use for livestock and poultry breeding and secondary and tertiary industries, and complying with relevant standards and regulations such as the "Design Specification for Village and Town Water Supply Engineering".

（3）Convenience of Water Use: In principle, centralized water supply projects in plain and shallow mountain areas require that all water supply be provided to households; For mountainous and pastoral areas that do not have the conditions to enter households, water shall be supplied by centralized water supply points or decentralized projects, and the round-trip time for manual water intake shall not exceed10min.

（4）Water supply guarantee rate: thousands of tons per million people (daily water supply scale)1000m3/dOr beneficiary population10000The water supply guarantee rate for water supply projects above the level of personnel shall not be less than95%The water supply guarantee rate of other water supply projects shall not be lower than90%.

IIEngineering plan;

Zhongke Meili Water Treatment covers the production and installation of equipment for urban drinking water, packaged drinking water, industrial production circulating water, purified water, high-purity water, and more. At present, there are several ways to renovate rural drinking water;

1Basic processing; Treatment of water quality, sediment, suspended solids, bacteria, and viruses. This processing method generally adopts multi-media filtration and disinfection. There are three types of disinfection methods: ultraviolet radiation, ozone, and chlorine dioxide.

2Heavy metals such as iron, manganese, arsenic, and hardness exceed the standard; The project deals with the names of heavy metals, which can generally be replaced and removed by adsorption using corresponding molecular sieve fillers.

3Excessive levels of sulfates and nitrates; The indicators that exceed the standard can be selectedROThe comprehensive implementation of membrane processing and blending scheme is carried out to reduce costs and ensure water quality.

4Water quality optimization; After membrane treatment, some groundwater and tap water can be supplied with secondary water or made into direct drinking water.