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Evaporative crystallization zero-emission system and method for industrial high-salinity wastewater

A high-salt wastewater, evaporation and crystallization technology, applied in chemical instruments and methods, water/sewage treatment, water/sewage multi-stage treatment, etc., can solve the problem of high difficulty in acclimating activated sludge, increased investment and operating costs, and ineffective salinity Eliminate other problems to achieve the effect of superior compatibility, low operating cost and stable structure

Pending Publication Date: 2017-10-20
DONGGUAN DONGYUAN ENVIRONMENTAL TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] When chemical methods are used to treat high-salt wastewater, only COD, ammonia nitrogen, and some organic matter can be treated, but the salt in high-salt wastewater cannot be effectively removed; when the salinity of high-salt wastewater is low; when treated by biological methods, High salt will inhibit the growth of microorganisms and even become a toxic agent for microorganisms; when the salinity of the influent is diluted, although the microorganisms will not be inhibited, it will cause huge waste of water resources, increase investment and operating costs, and make it difficult to domesticate activated sludge higher

Method used

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  • Evaporative crystallization zero-emission system and method for industrial high-salinity wastewater

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0048] See figure 1 , a zero-discharge system for industrial high-salt wastewater evaporation and crystallization, the zero-discharge system includes:

[0049] The heat exchanger 2 is used to heat the high-salt wastewater;

[0050] The evaporation tank 3 is used to receive the high-salt wastewater from the heat exchanger 2 and conduct heating and evaporation;

[0051] The insulation tank 4 is used to receive the high-salt wastewater from the evaporation tank 3 and carry out insulation and stirring;

[0052] The crystallization tank 5 is used to receive the high-salt wastewater from the insulation tank 4 and perform flash concentration;

[0053] The centrifugal separation device 6 is used for receiving the high-salt wastewater from the crystallization tank 5 and performing centrifugal separation.

[0054]The present invention treats high-salt wastewater through evaporation, concentration and crystallization, finally realizes zero discharge, and is economical and efficient. ...

Embodiment 2

[0074] The difference between this embodiment and embodiment 1 is:

[0075] A method for evaporation and crystallization of industrial high-salt wastewater, comprising the steps of:

[0076] (1) Heating: use the heat exchanger 2 to heat the high-salt wastewater at room temperature to 35°C;

[0077] (2) Evaporation: use the evaporation tank 3 to heat the high-salt wastewater heated by the heat exchanger 2 to 45°C to evaporate under reduced pressure;

[0078] (3) Thermal insulation and stirring: add the high-salt wastewater evaporated from the evaporation tank 3 into the thermal insulation tank 4 for thermal insulation and stirring for later use;

[0079] (4) Flash evaporation: heat the high-salt waste water in the insulation tank 4 to 60°C with the heater 51 and pass it into the crystallization tank 5 for flash evaporation, and collect the condensed water from the condensed water outlet of the heater 51 and the condenser 52 for recycling. use;

[0080] (5) Centrifugal separa...

Embodiment 3

[0082] The difference between this embodiment and embodiment 1 is:

[0083] A method for evaporation and crystallization of industrial high-salt wastewater, comprising the steps of:

[0084] (1) Heating: use the heat exchanger 2 to heat the high-salt wastewater at room temperature to 45°C;

[0085] (2) Evaporation: use the evaporation tank 3 to heat the high-salt wastewater heated by the heat exchanger 2 to 75°C to evaporate under reduced pressure;

[0086] (3) Thermal insulation and stirring: add the high-salt wastewater evaporated from the evaporation tank 3 into the thermal insulation tank 4 for thermal insulation and stirring for later use;

[0087] (4) Flash evaporation: heat the high-salt waste water in the insulation tank 4 to 75°C with the heater 51 and pass it into the crystallization tank 5 for flash evaporation, and collect the condensed water from the condensed water outlet of the heater 51 and the condenser 52 for recycling. use;

[0088] (5) Centrifugal separa...

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Abstract

The invention relates to the technical field of wastewater purification, in particular to an evaporative crystallization zero-emission system and method for industrial high-salinity wastewater; the system comprises: a heat exchanger for heating high-salinity wastewater; an evaporative tank for receiving the high-salinity wastewater from the heat exchanger and heating for evaporating; an insulation tank for receiving the high-salinity wastewater from the evaporative tank and performing heat-insulated stirring; a crystallizing tank for receiving the high-salinity wastewater from the insulation tank and performing flashing condensation; a centrifugal separation device for receiving the high-salinity wastewater from the crystallizing tank and performing centrifugal separation. The industrial high-salinity wastewater processed via the system can be condensed to 30-60 times, derivatives are solid and condensate, the solid is a composite salt and may be separated and dried to obtain industrial finished salt, the condensate may be recycled to a production line, and accordingly zero emission of the high-salinity wastewater is achieved.

Description

technical field [0001] The invention relates to the technical field of wastewater purification, in particular to a zero-discharge system and method for evaporation and crystallization of industrial high-salt wastewater. Background technique [0002] Industrial high-salt wastewater refers to wastewater with a total salt content of more than 1%. The wastewater contains salt, organic matter, heavy metals, and even radioactive substances. Dispose of properly to avoid its adverse impact on the environment. [0003] When chemical methods are used to treat high-salt wastewater, only COD, ammonia nitrogen, and some organic matter can be treated, but the salt in high-salt wastewater cannot be effectively removed; when the salinity of high-salt wastewater is low; when treated by biological methods, High salt will inhibit the growth of microorganisms and even become a toxic agent for microorganisms; when the salinity of the influent is diluted, although the microorganisms will not be ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F9/10C08L61/06C08L33/20C08K3/26C08J9/14D01F8/08D01F1/10
CPCD01F1/10D01F8/08C02F9/00C08J9/141C08J9/145C08L61/06C02F1/44C02F1/048C02F1/38C02F1/06C08J2361/06C08J2203/202C08J2203/14C08J2203/142C08K2201/011C08K2003/265C08L33/20C08K3/26
Inventor 肖应东兰文青徐蓉珊张文翔
Owner DONGGUAN DONGYUAN ENVIRONMENTAL TECH CO LTD
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