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Novel high-salt mercury-containing wastewater concentration method

A technology of wastewater concentration and high salt, applied in chemical instruments and methods, water/sewage treatment, water/sewage multi-stage treatment, etc. Operation cost, realization of evaporative crystallization, simple process effect

Inactive Publication Date: 2020-06-05
国初科技(厦门)有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Due to the high energy consumption of this treatment method, the cost of most wastewater treatment is unbearable. With the improvement of environmental protection wastewater discharge standards and the strengthening of environmental law enforcement, far-sighted chlor-alkali enterprises have begun to try to use organic salty wastewater. Purification, evaporative concentration and crystallization, but only using evaporative concentration and crystallization will generate excess waste, and the production efficiency of this process is low

Method used

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  • Novel high-salt mercury-containing wastewater concentration method
  • Novel high-salt mercury-containing wastewater concentration method
  • Novel high-salt mercury-containing wastewater concentration method

Examples

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Comparison scheme
Effect test

Embodiment 1

[0044] A treatment method for high-salt mercury-containing wastewater, the specific steps are:

[0045] Step 1: the COD concentration is 322mg / L, PH is 7.6, mercury ion content 7ppb, chloride ion content 22323mg / L, sulfate ion content 65300mg / L high-salt mercury-containing waste water is injected in stock solution feeding tank 8, simultaneously The light brine after electrolysis of saturated brine, the specific NaCl content is 193-202g / L, and the pH is 8-11 is injected into the draw liquid feed tank;

[0046] Step 2: Use the raw liquid feed pump 9 to transport high-salt mercury-containing waste water, pass through the raw liquid filter 10, and then enter the inner wall side of the forward osmosis membrane module 4. After the liquid filter 3, enter the outer wall side of the forward osmosis membrane module 4;

[0047] Step 3: After the draw solution passes through the forward osmosis membrane module, the solution will be diluted, and the osmotic pressure will tend to be consis...

Embodiment 2

[0053] A treatment method for high-salt mercury-containing wastewater, the steps of which are:

[0054] Step 1, the COD concentration is 322mg / L, PH is 7.6, mercury ion content 7ppb, chloride ion content 22323mg / L, the high-salt mercury-containing waste water of sulfate ion content 65300mg / L injects in the stoste feeding tank 8, simultaneously The light brine after electrolysis of saturated brine, with NaCl content of 182-191g / L and pH of 8-11, is injected into the draw liquid feeding tank;

[0055] Step 2, use the raw liquid feed pump 9 to transport high-salt mercury-containing wastewater into the raw liquid filter 10 and filter it, then enter the inner wall side of the forward osmosis membrane module 4, and use the draw liquid feed pump 2 to transport the light brine of the draw liquid through After the draw liquid filter 3, enter the outer wall side of the forward osmosis membrane module 4;

[0056] Step 3, after the draw solution passes through the forward osmosis membran...

Embodiment 3

[0062] A treatment method for high-salt mercury-containing wastewater, the steps of which are:

[0063] Step 1, the COD concentration is 322mg / L, PH is 7.6, mercury ion content 7ppb, chloride ion content 22323mg / L, sulfate ion content 65300mg / L high-salt mercury-containing waste water is injected in 8-stock solution feeding tank 8, At the same time, the refined brine of saturated saline, with a NaCl content of 240-248g / L and a pH of 7, is injected into the drawing liquid feeding tank;

[0064] Step 2, use the raw liquid feed pump 9 to transport the high-salt mercury-containing waste water through the raw liquid filter 10 to filter, then enter the inner wall side of the forward osmosis membrane module 4, and use the draw liquid feed pump 2 to transport the draw liquid fine brine through After the draw liquid filter 3, enter the outer wall side of the forward osmosis membrane module 4;

[0065] Step 3, after the draw solution passes through the forward osmosis membrane module, ...

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Abstract

The invention discloses a novel high-salt mercury-containing wastewater concentration method. A forward osmosis concentration technology and an evaporation concentration technology are effectively combined; mercury-containing wastewater is subjected to evaporative crystallization treatment; wherein the forward osmosis concentration technology and the membrane separation technology utilize physicalcharacteristics driven by osmotic pressure; pure physical separation and osmotic concentration processes are adopted, phase change is avoided, the energy consumption is low, the process is simple, dechlorinated light salt brine is used as a draw solution, the draw solution is diluted and then re-injected into a salt well, waste water needing to be treated outside cannot be generated, resources ofthe chlor-alkali industry are fully utilized, zero emission is achieved, the process efficiency is improved, energy consumption is reduced, and the operation cost is reduced.

Description

technical field [0001] The invention relates to the technical field of wastewater treatment, in particular to a novel method for concentrating high-salt mercury-containing wastewater. Background technique [0002] Many of the existing large-scale chlor-alkali enterprises in China are built on the basis of salt mines, using their own salt mine resources to realize all-halogen alkali production. Chlorine and alkali are both important basic chemical raw materials. More and more chlor-alkali factories are extending the industrial chain to produce downstream organic chlorine and alkali products. In the process of full-halogen alkali production, in chlor-alkali factories that are closer to salt wells, the tank is generally used. Light brine back well re-saturation process. Using this process will face the problem that the by-products contain a large amount of organic saline wastewater. [0003] In the VCM production section, the production raw materials are acetylene and hydroge...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F9/10
CPCC02F1/001C02F1/04C02F1/445C02F9/00
Inventor 吴晓斌黎健卢铀忠廖观顺
Owner 国初科技(厦门)有限公司
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