Method of reducing amount of regenerated wastewater discharged from chelating resin tower

A technology for chelating resin towers and regenerated wastewater, applied in separation methods, filter regeneration, chemical instruments and methods, etc., can solve the problems of regenerated wastewater discharge, reduce emissions, realize wastewater reuse, and reduce sewage treatment cost effect

Inactive Publication Date: 2019-09-06
重庆市映天辉氯碱化工有限公司
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Problems solved by technology

[0004] The purpose of this application is to provide a new method for reducing the discharge of regenerated wastewater from the chelating resin tower for the existing chelating resin tower regeneration wastewater discharge

Method used

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  • Method of reducing amount of regenerated wastewater discharged from chelating resin tower

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Embodiment

[0018] In this example, the method for reducing the discharge of regeneration wastewater from the chelating resin tower includes dividing the technological process of the regeneration of the chelating resin tower into the first water washing, backwashing, hydrochloric acid regeneration, the second water washing, NaOH regeneration, and the third Washing and brine replacement steps; according to the above steps, the regeneration wastewater of the chelating resin tower is divided into the first washing wastewater, backwash wastewater, hydrochloric acid regeneration wastewater, the second washing wastewater, NaOH regeneration wastewater, the third washing wastewater and brine Replacing waste water; reclaiming the waste water generated in each step separately, reclaiming the waste water that meets the standards as the primary refined brine in the chlor-alkali production process, and discharging the rest of the waste water that does not meet the standards for treatment, thereby reduci...

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Abstract

The invention discloses a method of reducing the amount of regenerated wastewater discharged from a chelating resin tower. According to the method, a regeneration process of the chelating resin toweris divided into the steps of first water washing, backwashing, hydrochloric acid regeneration, second water washing, NaOH regeneration, third water washing, brine replacement, and the like; accordingto the above steps, the wastewater is divided into wastewater of first water washing, backwashing wastewater, wastewater of hydrochloric acid regeneration, wastewater of second water washing, wastewater of NaOH regeneration, wastewater of third water washing, and wastewater of brine replacement; the wastewater from each step is recycled separately, the wastewater that meets standards is recycled as primary refined brine, and the other wastewater that does not meet the standards is re-discharged for treatment, so that the amount of the regenerated wastewater discharged from the chelating resintower is reduced. By adopting the method, the amount of the regenerated wastewater discharged from the chelating resin tower, the expense of sewage discharge, and the treatment cost of sewage discharge can be effectively reduced; in addition, most of the regenerated wastewater from the chelating resin tower is used as the primary refined brine so that the production cost can be reduced.

Description

technical field [0001] The application relates to the technical field of chlor-alkali production technology, in particular to a method for reducing the discharge of regenerated wastewater from a chelating resin tower. Background technique [0002] The process of chlor-alkali production will involve the process of treating the primary refined brine into secondary refined brine, specifically including that the primary refined brine is heated to 60±5°C through a heat exchanger and sent to the chelating resin tower, and the heavy metal ions in the brine are adsorbed Afterwards, it passes through the resin trap to capture the broken resin in the brine, and the qualified secondary refined brine is pumped to the electrolysis process for use. [0003] Among them, the chelating resin tower is operated in series with two towers. The first tower is used as the "primary tower" to remove most of the calcium, magnesium and other heavy metal ions in the brine; the second tower is used as t...

Claims

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Application Information

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IPC IPC(8): C02F1/28B01J20/26B01J20/34C02F101/12C02F101/20
CPCB01J20/26B01J20/3425B01J20/3475C02F1/285C02F2101/12C02F2101/20
Inventor 曾永寿吴双根魏相章饶鑫许渊
Owner 重庆市映天辉氯碱化工有限公司
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