Method for preparing fresh water with various water quality grades

Abstract

The invention provides a method for preparing fresh water with various water quality grades, which utilizes equipment used for preparing fresh water with various water quality grades to prepare freshwater. The method is characterized by comprising the following steps of: 1, collecting raw water from a water source by using a raw water collecting device, the raw water being any one of seawater, brackish water and fresh water; 2, filtering the raw water by using a scraper type filter screen filtering part so as to intercept suspended solids with the granularity of more than or equal to 30-80 [mu]m to obtain D-grade water; 3, filtering the D-grade water by using a membrane filtering part to obtain C-grade water with turbidity of less than or equal to 5NTU; 4, if the raw water is seawater, carrying out reverse osmosis treatment on the C-grade water by utilizing a first reverse osmosis unit so as to obtain first B-grade fresh water; and if the raw water is brackish water or fresh water, performing reverse osmosis treatment on the C-grade water by a second reverse osmosis unit to obtain second B-grade fresh water; and 5, carrying out second-grade reverse osmosis treatment on the first B-grade fresh water or the second B-grade fresh water by a third reverse osmosis unit to obtain A-grade water.

Description

technical field [0001] The invention relates to the field of water treatment, and specifically relates to a method for preparing fresh water of various water qualities. Background technique [0002] my country's natural water resources are very rich in types, including rivers, lakes, rivers, seas, reservoirs, canals, wells and other surface water or groundwater, etc. According to whether the water contains salt, the above water resources can be divided into seawater, brackish water and freshwater. In order to make full use of these natural water resources, the raw water collected from the water source can be processed into drinking water through water extraction equipment. [0003] In the prior art, water production equipment with a certain scale and built at a fixed location is usually only specially designed for local water sources, and seawater desalination production equipment is more common. The whole of such water production equipment is often very large, and it is se...

AI Technical Summary

Problems solved by technology

[0008] The present invention is carried out to solve the above-mentioned problems of rapid preparation of fresh water of various water qualities and the problem of excessive volume of water production equipment, and the purpose is to provide a method for producing fresh water of various water qualities

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