Concentrated salt water zero discharging membrane concentration and quality grading crystallization process and concentrated salt water zero discharging membrane concentration and quality grading crystallization equipment

A membrane concentration and zero discharge technology, which is applied in seawater treatment, water/sewage treatment, general water supply conservation, etc., can solve the problems of lack of systematic process, lack of treatment effect and economy, and inability to complete the whole process treatment, so as to reduce the Operating cost and efficiency improvement effect

Pending Publication Date: 2017-07-21
MAIWANG INT BUSINESS SHANGHAI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although there are many processing methods, they all have certain limitations in application, lack of systematic proces

Method used

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  • Concentrated salt water zero discharging membrane concentration and quality grading crystallization process and concentrated salt water zero discharging membrane concentration and quality grading crystallization equipment
  • Concentrated salt water zero discharging membrane concentration and quality grading crystallization process and concentrated salt water zero discharging membrane concentration and quality grading crystallization equipment

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0038] The concentrated brine enters the storage adjustment tank 1 of the pretreatment device 2 in the pretreatment step. After the water in the pretreatment device 2 passes through the advanced oxidation device, it is fully coagulated and softened by adding softeners such as lime in the sedimentation tank, and then enters the softening micro The filter device performs filtration to remove hardness and turbidity, and remove most of the calcium, magnesium, hardness, alkalinity and suspended impurities in the concentrated brine; the inorganic sludge periodically discharged from the softening microfiltration membrane device is dewatered by pressure filtration, and the filtrate is returned to storage for adjustment Pool 1, the dehydrated cake forms ordinary sludge and solid waste, which is transported out for disposal. The pH of the effluent from the pretreatment device 2 is adjusted back and then enters the nanofiltration membrane separation device 3; the concentrated brine is sepa...

Embodiment 2

[0047] This embodiment is the same as Embodiment 1, except that the advanced oxidation device in the pretreatment device can be an ozone oxidation device (or an ozone catalytic oxidation device, an ozone hydrogen peroxide oxidation device), and the sedimentation tank 204 is omitted. The super concentration device 509 can be a vibrating membrane, a high pressure membrane or a forward osmosis membrane. The membrane softening filter device 205 can be precipitation + immersion ultrafiltration, or precipitation + tubular micro (ultra) filtration membrane, or can be a traditional chemical softening process, that is, drug addition reaction + precipitation + filtration + ultrafiltration. Evaporation concentrator 603 may be multi-effect evaporative concentration or mechanical compression evaporative concentration, and evaporative crystallizer 605 may be multi-effect evaporative crystallizer or mechanical compression evaporative crystallizer. The nanofiltration device 302 is changed to ...

Embodiment 3

[0049] This embodiment is the same as the first embodiment, except that when the hardness of the raw water is low, the membrane softening device 507 in the membrane treatment process can be omitted. When the raw water does not contain nitrate, the frozen crystal 606 and its corresponding centrifugal separation system (607, 608, 609, 610, 616, 617) can be omitted.

[0050] Taking concentrated brine to be treated in a typical coal chemical zero discharge plant as an example, the water inflow is 60m 3 / h, salt content 1.7%, COD300mg / L, total hardness 1000mg / L, total alkalinity 2000mg / L, after this membrane concentration process reduces the amount and reuses, the final super-concentrated brine water volume 3 / h, the overall operating cost 3 . The water produced by the super-concentration device is mixed with the water produced by the front-stage seawater desalination and reverse osmosis device, and the water quality reaches the water quality specified in the national "Urban Sewage...

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PUM

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Abstract

The invention relates to a concentrated salt water zero discharging membrane concentration and quality grading crystallization process and concentrated salt water zero discharging membrane concentration and quality grading crystallization equipment. The concentrated salt water zero discharging membrane concentration and quality grading crystallization process comprises a pretreatment step, a membrane concentration treatment step, and a quality grading crystallization treatment step, wherein a pretreatment device comprises a high-grade oxidation unit and a softening microfiltration unit, the membrane concentration treatment step comprises nano-filtration membrane separation, seawater desalination reverse osmosis membrane separation and super-concentration separation, and the quality grading crystallization process comprises separating a sodium chloride and sodium sulfate mixing salt and a sodium nitrate product salt. According to the present invention, by combining a variety of concentration processes, the concentrated salt water treatment efficiency of the equipment can be effectively improved, the purpose of reduction and zero discharging of the concentrated salt water can be achieved, and the running cost of the concentrated salt water treatment equipment can be reduced.

Description

technical field [0001] The invention relates to a water treatment process and equipment, in particular to a concentrated brine zero discharge membrane concentration and fractional crystallization process and equipment. Background technique [0002] Zero discharge of wastewater is the goal required by the coal chemical industry and an important link to achieve sustainable and stable development. In the entire process of zero discharge of wastewater treatment, the high investment and operating costs of evaporation and crystallization devices are a major bottleneck restricting the realization of zero discharge. Therefore, the reduction and reuse of wastewater before evaporative crystallization is a key link to effectively reduce the overall treatment cost. [0003] The concentrated brine targeted by the zero discharge device in the coal chemical industry is mainly the concentrated brine produced by the wastewater discharged from the coal chemical plant after undergoing biochemi...

Claims

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Application Information

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IPC IPC(8): C02F9/10C01D3/14C01D5/16C01D9/16C02F103/08
CPCC01D3/14C01D5/16C01D9/16C02F9/00C02F1/06C02F1/04C02F1/56C02F1/66C02F1/72C02F1/722C02F1/441C02F1/442C02F1/444C02F2103/08C02F2001/425Y02A20/131
Inventor 韩勇涛冯杰陈远超杨凯段俊
Owner MAIWANG INT BUSINESS SHANGHAI
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