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High-salt waste water treatment method

A technology for high-salt wastewater and wastewater, applied in seawater treatment, return water treatment, water/sewage treatment, etc., can solve the problems of no treatment method, ecological environment troubles, etc., to extend continuous and stable operation time, the method is simple and easy The effect of low running and running costs

Active Publication Date: 2015-05-13
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, this patent does not provide a treatment method for the concentrated water problem of membrane distillation, which brings new troubles to the ecological environment

Method used

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  • High-salt waste water treatment method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0049] For a schematic diagram of the process, see figure 1 . The water quality characteristics of high-salt wastewater 15 in the figure are: wastewater pH6.5-8.5, conductance 9000-13000μs / cm, COD cr 0~100mg / L, Cl - 2000~5000mg / L, Ca 2+ 0~70mg / L, Mg 2+ 0~100mg / L, soluble silicon 0~50mg / L, NH 4 -N0~5mg / L. Forward osmosis raw water 1 is a glucose solution with a mass concentration of 5%.

[0050] The forward osmosis membrane module used is a cellulose acetate plate-and-frame membrane module; the membrane distillation module used is a polytetrafluoroethylene (PTFE) hollow fiber hydrophobic membrane module with a membrane pore size of 0.2 μm, and the membrane distillation form is an internal pressure vacuum membrane distillation.

[0051] The steps are as follows: (1) The high-salt wastewater 15 enters the membrane distillation heating pool 9, and the high-salt wastewater 15 is heated to 60° C. in the membrane distillation heating pool. After that, the heated high-salt waste...

Embodiment 2

[0057] For a schematic diagram of the process, see figure 1 . The water quality characteristics of the high-salt wastewater 15 are the same as those in Example 1. Forward osmosis raw water 1 is a whey protein solution with a mass concentration of 5%.

[0058] The forward osmosis membrane module used is a cellulose acetate plate-and-frame membrane module; the membrane distillation module used is a polypropylene (PP) hollow fiber hydrophobic membrane module with a membrane pore size of 0.2 μm, and the membrane distillation form is an internal pressure vacuum membrane distillation.

[0059] In the operation steps, the difference from Example 1 is that the high-salt wastewater 15 is heated to 70°C in the membrane distillation heating pool; when the conductivity of the membrane distillation concentrated water in the membrane distillation heating pool 9 reaches 180,000 μs / cm, the The distilled concentrated water raw water pump 10 is pumped into the membrane distillation concentrat...

Embodiment 3

[0065] For a schematic diagram of the process, see figure 1 . The water quality characteristics of the high-salt wastewater 15 are the same as those in Example 1. Forward osmosis raw water 1 is a whey protein solution with a mass concentration of 5%.

[0066] The forward osmosis membrane module used is a cellulose acetate plate-and-frame membrane module; the membrane distillation module used is a polypropylene (PP) hollow fiber hydrophobic membrane module with a membrane pore size of 0.2 μm, and the membrane distillation form is an internal pressure vacuum membrane distillation.

[0067] In the operation steps, the difference from Example 1 is that the high-salt wastewater 15 is heated to 70°C in the membrane distillation heating pool; when the conductivity of the membrane distillation concentrated water in the membrane distillation heating pool 9 reaches 200,000 μs / cm, the The distilled concentrated water raw water pump 10 is pumped into the membrane distillation concentrat...

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Abstract

The invention discloses a high-salt waste water treatment method. According to the high-salt waste water treatment method, concentration of high-salt waste water is carried out via membrane distillation; an obtained membrane distillation concentrated water is taken as a driving liquid of forward osmosis; the membrane distillation concentrated water is diluted via continuous concentration of forward osmosis feeding liquid collateral circulation raw water, when the concentration of the diluted membrane distillation concentrated water is equal to a certain concentration, the membrane distillation concentrated water is recycled to a membrane distillation unit for concentration treatment; and the above steps are repeated, so that deep concentration of the high-salt waste water is realized, and water of the high-salt waste water and forward osmosis raw water is recycled as far as possible. The high-salt waste water treatment method can be used for processing high-salt waste water, and can also be used for concentration treatment of river water, brackish water, seawater, surface water, municipal wastewater, petrochemical wastewater, landfill leachate, and solutions containing medicines and protein. No impressed pressure or little impressed pressure is needed for treatment; the high-salt waste water treatment method is simple and convenient; operation is simple; and operation cost is low compared with multiple-effect evaporation.

Description

technical field [0001] The invention relates to a method for treating high-salt wastewater by utilizing membrane separation technology, more specifically, relates to a method for treating high-salt wastewater by forward osmosis coupling membrane distillation technology, which belongs to the field of industrial wastewater treatment. Background technique [0002] In recent years, with the widespread application of membrane sewage treatment and reuse devices, the high-salt wastewater produced by petrochemical enterprises, especially the concentrated reverse osmosis water, has become a difficult problem to deal with. Great trouble. [0003] Membrane distillation (MD) has gradually attracted the attention of experts from various countries and conducted extensive research due to its ability to remove higher concentrations of salt and higher desalination rates. It can be regarded as the membrane technology with the highest desalination efficiency so far. Membrane distillation is a...

Claims

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Application Information

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IPC IPC(8): C02F9/10C02F1/44C02F1/08
CPCC02F1/08C02F1/445C02F9/00C02F2103/001C02F2103/007C02F2103/06C02F2103/08C02F2103/365C02F2301/04
Inventor 张新妙栾金义平春霞
Owner CHINA PETROLEUM & CHEM CORP
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