Method for treating easily-scaled salty wastewater

Abstract

The invention discloses a method for treating easily-scaled salty wastewater. The method comprises the following steps: A, preliminarily clarifying and filtering the wastewater to remove suspended particles in the wastewater; B, carrying out ion grouping on the wastewater by a first electrodialyzer; and C, respectively independently carrying out secondary concentrating on first compartment produced water and third compartment produced water: conveying the first compartment produced water into a second concentrating device to obtain corresponding first freshwater and first concentrated water, conveying the first freshwater into a first compartment, adding pure water into the first compartment, conveying the third compartment produced water into a third concentrating device to obtain third freshwater and third concentrated water, conveying the third freshwater into the third compartment, and adding pure water, commonly used as third compartment feed water, into the third compartment. Themethod has the advantages of realization of easily scaled ions, prevention of scaling in an apparatus, low running cost, small volume of concentrated water, and large amount of reused freshwater.

Description

technical field [0001] The invention relates to a wastewater treatment method, in particular to a treatment method for fouling-prone saline wastewater. Background technique [0002] With the deteriorating problem of water shortage in our country, the problem of overexploitation of groundwater in northern China is serious. Industrial water is a major user of water resources in my country. my country's long-term plan is to achieve a reuse rate of more than 80% for industrial wastewater, but currently it is generally only about 50%. Therefore, there will be a lot of room for growth in the reuse of industrial wastewater. At the same time, my country's environmental protection policy requires thermal power plants, electroplating, coal chemical industry and other industries to achieve zero discharge of wastewater. [0003] However, the current production cost of reclaimed water for industrial wastewater is too high, the quality of reclaimed water is not good, and the investment a...

AI Technical Summary

Problems solved by technology

However, the conventional double-alkali softening pretreatment process needs to add a large amount of chemical agents, which are expensive and produce a large amount of sludge

Images