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Evaporative crystallization method for salinity wastewater

A technology for evaporative crystallization, salt-containing wastewater, applied in heating water/sewage treatment and other directions, can solve the problems of poor crystal salt quality, need regular cleaning, insufficient stability, etc., achieve good crystal salt quality, improve scaling problems, Avoid cleaning effects

Active Publication Date: 2019-07-19
CHNA ENERGY INVESTMENT CORP LTD +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] The main purpose of the present invention is to provide a method for evaporative crystallization of salty waste water to solve the problem of poor crystallized salt quality and the need for regular cleaning due to insufficient stability of the non-seeded evaporative crystallization system in the prior art

Method used

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  • Evaporative crystallization method for salinity wastewater
  • Evaporative crystallization method for salinity wastewater

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Experimental program
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Embodiment 1

[0034] In Example 1, the method provided by the present invention is used to control the concentration ratio of the evaporation system and the crystallization system in real time to treat the embarrassing sewage. details as follows:

[0035] Evaporation process:

[0036] Monitor the pH value, TDS and silica content of the evaporation system every 4 hours. If the values ​​exceed or are not within the control range, the concentration ratio of the evaporation system needs to be adjusted.

[0037] Crystallization process:

[0038] (1) In the initial stage of the operation of the crystallization system, according to the different boiling points of different crystallization salts, the purity and relative content of the crystallization salts are controlled based on this, and the concentration ratio of the crystallization system is controlled based on BPE (boiling point difference); specifically, the front end of the crystallization process generally passes through The concentration...

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Abstract

The invention provides an evaporative crystallization method for salinity wastewater. The method comprises the following steps: S1, preheating salinity wastewater and then degassing; S2, carrying outevaporation treatment on degassed wastewater in an amorphous seeding operation mode to obtain secondary steam and discharge water in the evaporation process; in addition, carrying out real-time adjustment of the discharge amount of the discharge water according to the incoming water quality of the degassed wastewater so as to control concentration multiple of an evaporation system; S3, carrying out crystallization treatment on the discharge water in the amorphous seeding operation mode to obtain secondary steam and strong brine in the crystallization process, adding a defoaming agent into a crystallizer body for defoaming, concentrating the defoamed strong brine by starting a hydroseparator and starting a centrifuge for centrifugal dewatering to obtain solid carnallite; besides, in the process of running the hydroseparator, carrying out real-time adjustment on the discharge amount of supernate in the hydroseparator according to the water quality of the discharge water to control the concentration multiple of the crystallization system. The method disclosed by the invention solves the operational stability problem of the amorphous seeding evaporative crystallization system.

Description

technical field [0001] The invention relates to the technical field of sewage treatment, in particular to an evaporation crystallization method for salty waste water. Background technique [0002] With the advancement of environmental protection technology, there are currently some treatment methods for concentrated brine, such as membrane concentration, evaporation and crystallization. At present, evaporation and crystallization mainly adopt the operation mode of seed crystal method and non-crystal method. Since the operation and management requirements of the seed crystal method evaporator are relatively high, judging from the current operation of many seed crystal method evaporation systems in China, there are often fluctuations in the operation indicators of the evaporation system, Serious clogging of evaporator falling film tube / water distributor / cyclone separator etc. In the evaporation system, due to the presence of calcium and magnesium ions, silicon, alkalinity, an...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F1/04
CPCC02F1/04
Inventor 武海杰李成贺飞朱德汉莘振东张箭飞王海军刘义杜善明关丰忠金海峰吴国祥张怀滨庞松杜君鸿张秀云吴银生李玉林
Owner CHNA ENERGY INVESTMENT CORP LTD
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