Coal chemical industry high-salinity wastewater zero discharge process

Abstract

The invention discloses a coal chemical industry high-salinity wastewater zero-discharge process which comprises the following steps: feeding wastewater in a coal chemical industry wastewater settling tank into a pretreatment tank through a raw water pump, and feeding produced water into an adsorption tank after pretreatment; after the adsorber in the adsorption tank is saturated by adsorption, automatically cutting off the system, and analyzing the system by an analysis tank; feeding the desorption waste liquid generated after desorption of the adsorber by the desorption tank into a calcium recovery device through a first-stage heat exchanger and a second-stage heat exchanger to be treated, generating nanoscale calcium carbonate through a dispersing agent, and separating out and curing the nanoscale calcium carbonate in a calcium precipitation ceramic membrane and a calcium filter press to generate a nano calcium carbonate product; clear liquid separated by the II-stage ceramic membrane enters a magnesium recovery device, a magnesium product is produced after the clear liquid is separated by a magnesium precipitation ceramic membrane and a magnesium filter press, and the clear liquid is recovered to be reused as desorption liquid, so that zero discharge and resource utilization of waste liquid are realized. The process scheme is designed according to water quality characteristics, standardization and resource utilization are achieved, waste is used for treating waste, and wastewater recycling and zero discharge of wastewater are achieved.

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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