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Method for zero discharge recycling of high-salt waste water with electromagnetic forward osmosis reactor

A high-salt wastewater and reactor technology, applied in chemical instruments and methods, water/sewage multi-stage treatment, water/sludge/sewage treatment, etc., can solve the problems of waste of fresh water and the inability to really reduce the total amount of pollutant discharge , to achieve the effect of reducing processing costs, significant economic benefits, and protecting the ecological environment

Active Publication Date: 2015-05-27
XIAMEN NAVDY MEMBRANE TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This method not only can't really reduce the discharge total amount of pollutants, but also causes the waste of fresh water, especially the discharge of saline wastewater, which will inevitably cause the mineralization of fresh water resources and soil alkalization (Li Bingyuan, etc. The formation of high-salt wastewater and Progress in its treatment technology [J]. Chemical Industry Progress, 2014, 33(2): 493-497)

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0049] The electromagnetic forward osmosis reactor is used to treat the desulfurization and high-salt wastewater of power plants. The water quality is as follows: pH value is 6.6, COD Cr 2550mg / L, chloride 22000mg / L, BOD 5 80.9mg / L, SS 23000mg / L, fluoride 12.6mg / L, total cyanide 0.53mg / L, total arsenic 3.43mg / L, total mercury 0.06mg / L. Experimental results: After 24 hours of operation, the zero-discharge reuse rate of wastewater is 99.9%, the average removal rate of CODcr is 99.9%, and the removal rate of TDS is 97%. The equipment operates stably.

Embodiment 2

[0051] Using electromagnetic forward osmosis reactor to treat reverse osmosis concentrated high-salt wastewater, the water quality is as follows: pH value is 7.4, COD Cr 886mg / L, BOD 5 The TDS is 31.4mg / L, the TDS is 33000mg / L, the chloride is 19200mg / L, the fluoride is 18.5mg / L, the total cyanide is 0.08mg / L, the total arsenic is 0.09mg / L, and the total mercury is 0.079mg / L. Experimental results: After 24 hours of operation, the zero-discharge reuse rate of wastewater is 99.8%, the average removal rate of CODcr is 99.9%, and the removal rate of TDS is 99%. The equipment operates stably.

Embodiment 3

[0053] Using electromagnetic forward osmosis reactor to treat chemical high-salt wastewater, the water quality is as follows: pH value is 8.1, COD Cr 533.4mg / L, BOD 5 45.8mg / L, TDS 20840mgL, copper ion 27300mg / L, fluoride 16.8mg / L, total cyanide 1.35mg / L, total arsenic 0.72mg / L, total mercury 90.5mg / L. Experimental results: After 24 hours of operation, the zero-discharge reuse rate of wastewater is 99.7%, the average removal rate of CODcr is 98.9%, and the removal rate of TDS is 98%. The equipment operates stably.

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Abstract

The invention discloses a method for zero discharge recycling of high-salt waste water with an electromagnetic forward osmosis reactor, and relates to waste water treatment. The method comprises the steps that after the high-salt waste water is subjected to turbidness removal and pH is adjusted to 7, the high-salt waste water enters a raw water adjusting pool for stabilization of water quantity and water quality; an effluent of the raw water adjusting pool enters an electromagnetic crystallization reactor for crystallization; a supernatant fluid effluent of the electromagnetic crystallization reactor is filtered by a membrane filtration reactor, and enters the forward osmosis reactor for concentration; solid residues in the electromagnetic crystallization reactor are scraped regularly; back flushing water of the membrane filtration reactor flows back to the raw water adjusting pool; waste water concentration liquor concentrated by the forward osmosis reactor flows back the electromagnetic crystallization reactor; drawing liquor of the forward osmosis reactor absorbs pure water in the waste water, and then enters a membrane distillation unit for separation between the drawing liquor and the pure water; a pure water effluent of the membrane distillation unit is recycled; and drawing liquor of the membrane distillation unit is subjected to vapor condensation and flows back to the forward osmosis reactor. The method is used under normal temperature and pressure conditions; no chemical agent is required; no secondary pollution is exerted; the treatment cost is low; the efficiency is high; and the floor area of treatment equipment is small.

Description

technical field [0001] The invention relates to wastewater treatment, in particular to a method for zero-discharge reuse of high-salt wastewater by utilizing an electromagnetic forward osmosis reactor. Background technique [0002] In the process of social and economic development and urbanization in our country, the shortage of water resources is gradually becoming one of the main factors restricting the sustainable development strategy of our country. In recent years, with the continuous increase of my country's industrial scale, industrial water consumption has increased sharply. At the same time, the amount of wastewater produced is also increasing rapidly, which brings great challenges to the current wastewater treatment and recycling technologies. If industrial wastewater is discharged directly, it will cause serious pollution to the surrounding soil and water environment. After the wastewater is treated up to standard, if it is not recycled, it will cause waste of w...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F9/12
Inventor 孔健
Owner XIAMEN NAVDY MEMBRANE TECH
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