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High salinity wastewater zero-emission method

A high-salt wastewater and zero-discharge technology is applied in energy wastewater treatment, chemical instruments and methods, and multi-stage water/sewage treatment. Low operating cost and effective solution to difficult problems

Inactive Publication Date: 2016-06-01
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] In view of the defects existing in the prior art, the object of the present invention is to provide a zero-discharge method for high-salt wastewater, which solves the problem of difficult treatment of high-salt wastewater, recycles water resources to the greatest extent, and has low operating costs

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  • High salinity wastewater zero-emission method

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Effect test

Embodiment 1

[0066] For a schematic diagram of the process, see figure 1 . The water quality characteristics of high-salt wastewater in this example are: wastewater pH6.5, conductivity 10000μs / cm, COD cr 0 mg / L, Na + 2000mg / L, Cl - 2500mg / L, total hardness (CaCO 3 )100mg / L, SS500mg / L, dissolved silicon 50mg / L, NH 4 -N50mg / L.

[0067] Adopt the zero discharge method of high-salt wastewater of the present invention to process the steps of high-salt wastewater as follows:

[0068] (1) Submerged ultrafiltration: High-salt wastewater enters the submerged ultrafiltration unit for filtration treatment to remove most of the turbidity and suspended solids in the high-salt wastewater. After being separated by the submerged ultrafiltration unit, the obtained ultrafiltration product Water enters step (2) for treatment, and the submerged ultrafiltration system regularly discharges sludge, and the discharged sludge is dried and disposed of;

[0069] (2) Disk-type reverse osmosis: The ultrafiltrat...

Embodiment 2

[0082] For a schematic diagram of the process, see figure 1 . The water quality characteristics of high-salt wastewater in this example are: wastewater pH 7, conductivity 15000 μs / cm, COD cr 50mg / L, Na + 3000mg / L, Cl - 3500mg / L, total hardness (CaCO 3 )500mg / L, SS700mg / L, dissolved silicon 70mg / L, NH 4 -N200mg / L.

[0083] The operating steps of embodiment 2 are the same as embodiment 1, and the differences between this embodiment and embodiment 1 are:

[0084] In the above steps, the submerged ultrafiltration unit in step (1) adopts an external pressure type, submerged polysulfone hollow fiber curtain membrane module with a membrane pore size of 0.03 μm;

[0085] In the above steps, the aeration system at the bottom of the submerged ultrafiltration tank of the submerged ultrafiltration unit in step (1) adopts aeration tube aeration, adopts an air compressor to generate compressed air, and the air-to-water volume ratio is 15:1;

[0086] In the above steps, the operating ...

Embodiment 3

[0095] For a schematic diagram of the process, see figure 1 . The water quality characteristics of high-salt wastewater in this example are: wastewater pH 7.5, conductivity 20000 μs / cm, COD cr 100mg / L, Na + 4000mg / L, Cl - 5000mg / L, total hardness (CaCO 3 )1000mg / L, SS1000mg / L, dissolved silicon 100mg / L, NH 4 -N500mg / L.

[0096] The operating steps of embodiment 3 are the same as embodiment 1, and the differences between this embodiment and embodiment 1 are:

[0097] In the above steps, the submerged ultrafiltration unit in step (1) adopts an external pressure type, submerged polytetrafluoroethylene hollow fiber curtain membrane module, and the membrane pore size is 0.05 μm;

[0098] In the above-mentioned steps, the aeration system at the bottom of the submerged ultrafiltration tank of the submerged ultrafiltration unit in step (1) adopts aeration disc aeration, adopts an air compressor to generate compressed air, and the air-to-water volume ratio is 20:1;

[0099] In t...

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Abstract

The present invention relates to the field of industrial wastewater treatment, and specifically relates to a high salinity wastewater zero-emission method. According to the high salinity wastewater zero-emission method, immersed ultra-filtration, disc tube reverse osmosis (dt-ro) and evaporation crystallization are used for treatment of high salinity wastewater. Firstly the immersed ultra-filtration is used for removing most of turbidity and suspended solids in wastewater, then the disc tube reverse osmosis (dt-ro) is used for deep concentration treatment of the high salinity wastewater with the turbidity and suspended solids being removed, salt solids in the concentration water are crystallized by evaporation crystallization treatment of the reverse osmosis concentration water after the disc tube reverse osmosis deep concentration treatment, and the salt solids and sludge slag produced by regular sludge discharge of the immersed ultra-filtration process are separately and respectively dried. The disc tube reverse osmosis producing water and the evaporation and crystallization producing water produced in the treatment process both can be reused in the production process. According to the high salinity wastewater zero-emission method, the high salinity wastewater emission problem can be solved, meanwhile the recovery of water resources is maximized, and high salinity wastewater zero-emission is basically realized.

Description

technical field [0001] The invention relates to the field of industrial wastewater treatment, in particular to a zero-discharge method for high-salt wastewater. In particular, it refers to a zero-discharge method for treating high-salt wastewater by "submerged ultrafiltration + disc tube reverse osmosis + evaporation crystallization". Background technique [0002] In recent years, the high-salt wastewater produced by petrochemical enterprises has become a difficult problem to deal with. This wastewater can neither be discharged nor reused, which has brought great troubles to various enterprises. Therefore, there is an urgent need to seek new separation technologies to solve the problem of treatment and discharge of such wastewater. [0003] Disk-type reverse osmosis membrane (DTRO membrane) is a form of reverse osmosis, and it is a membrane module specially used to treat high-concentration sewage. Its core technology is a disk-type membrane membrane column. The reverse osm...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F9/10
CPCY02W10/33Y02W10/37
Inventor 张新妙彭海珠杨永强
Owner CHINA PETROLEUM & CHEM CORP
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