A zero-discharge process for coal chemical high-salt wastewater

Abstract

The invention discloses a coal chemical industry high-salt wastewater zero-discharge process, comprising: the wastewater in the coal chemical industry wastewater settling tank is pumped into a pretreatment tank by a raw water pump, and after pretreatment, its produced water enters an adsorption tank; After the adsorber is saturated with adsorption, the system is automatically cut off, and the analysis tank is used for analysis; the analysis waste liquid generated after the analysis of the adsorber by the analysis tank is sent to the calcium recovery device through the first-stage heat exchanger and the second-stage heat exchanger. Processing, using a dispersant to produce nano-scale calcium carbonate, which is separated and solidified in a calcium-precipitated ceramic membrane and a calcium filter press to produce a nano-calcium carbonate product; after being separated by a class II ceramic membrane, the clear liquid enters the magnesium recovery device and passes through the magnesium-precipitated ceramic membrane. Magnesium products are produced after separation from magnesium and magnesium filter presses, and the clear liquid is recovered and reused as analytical liquid to achieve zero discharge and resource utilization of waste liquid. According to the characteristics of water quality, this application designs a process plan to realize standardization and resource utilization, to make waste from waste, to realize waste water recycling and zero discharge of waste water.

Description

technical field [0001] The invention belongs to the technical field of water treatment in coal chemical industry, and in particular relates to a zero discharge process of high-salt wastewater in coal chemical industry. Background technique [0002] The coal chemical industry is a key development industry in my country. The traditional coal chemical water treatment process uses chemicals and gravity sedimentation methods, but there are problems such as scaling and fouling in the gray water system; coal chemical water has high temperature, high hardness, high alkalinity, The characteristics of high ammonia nitrogen, high COD, and high suspended solids are practical production problems in the industry. They have plagued coal chemical companies for many years, and have also restricted the long-term stable operation of coal gasifiers, which in turn affects the economical operation of coal gasifiers. Large amount of wastewater discharge, high difficulty in treatment, serious waste o...

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Problems solved by technology

[0003] In view of the deficiencies of the existing coal chemical wastewater treatment technology, this application proposes a coal chemical high-salt wastewater zero-discharge process, which adopts "pretreatment + adsorption + analysis + recovery + resource utilization", which can effectively solve the problem of coal chemical wastewater system Scaling problem, reduce waste water discharge, reduce the original chemical dosage, ease the difficulty of sewage treatment, and realize the stable operation of the gasifier in the upper cycle

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