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System and method for multi-mode wastewater treatment by forward osmosis technology

A wastewater treatment, multi-mode technology, applied in the field of forward osmosis technology multi-mode wastewater treatment system, can solve the problems of unstable operating parameters, unclear operating conditions, missing operating data, etc., to achieve flexible and changeable operating modes, chemical cleaning The effect of low frequency and stable water production up to standard

Pending Publication Date: 2022-03-22
BEIJING DRAINAGE GRP CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Compared with thermal concentration technology, membrane concentration technology has the following advantages: small equipment footprint, modular installation, low investment, and good water quality. The membrane system uses plastic pipelines to reduce scaling and corrosion; but at the same time The following problems exist: high-salt and high-concentration organic wastewater membrane concentration technology is an emerging technology, and there are few cases, which need to be verified by experiments; high operating pressure, serious membrane pollution, and TDS concentration limit of 70,000-90,000 mg / L; membrane distillation technology (MD ) membrane flux is small, there is a phase change, and when there is no waste heat available, the energy consumption per ton of water is high; electrodialysis (ED) equipment occupies a large area and is complicated to maintain; the unit volume of the vibrating membrane (DM) Small membrane area, small amount of treated water, low concentration ratio
Although there are some engineering application cases and attempts, there are still problems such as missing operating data, unclear operating conditions, and unstable operating parameters in the actual application process.

Method used

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  • System and method for multi-mode wastewater treatment by forward osmosis technology
  • System and method for multi-mode wastewater treatment by forward osmosis technology
  • System and method for multi-mode wastewater treatment by forward osmosis technology

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0080] This embodiment provides a system for the multi-mode treatment of wastewater by forward osmosis technology, such as figure 2 As shown, the system includes: feed liquid tank V-01, feed liquid pump P-01, feed liquid side bag filter F-01, forward osmosis membrane unit 1, draw liquid tank V-02, draw liquid pump P -02, draw liquid side bag filter F-02, salt replenishment device, physical cleaning water tank V-03, physical cleaning water pump P-03, chemical cleaning water tank V-04 and chemical cleaning water pump P-04;

[0081] The feed liquid tank V-01 is respectively provided with a feed liquid water outlet and a feed liquid concentrated water return port;

[0082] The pipeline connected between the feed liquid outlet and the feed liquid side of the forward osmosis membrane unit is sequentially provided with a first valve 2WV1, the feed liquid pump P-01, and the feed liquid side bag filter F-01, feed liquid pressure sensor PT01, feed liquid electromagnetic flowmeter FT01...

Embodiment 2

[0092] This embodiment provides a method for treating waste water with forward osmosis technology in multiple modes. The method adopts the system for treating waste water in multiple modes with forward osmosis technology described in Example 1 to treat landfill leachate. The landfill leachate is taken from Beijing Municipality The specific water quality data of the old liquid in the first phase of a certain sanitary landfill site are shown in Table 2.

[0093] Table 2 Landfill leachate water quality data

[0094]

[0095] Including the following steps:

[0096] S1: Adjust the pH of the feed liquid in the feed liquid tank V-01 to a preset pH value of 5-7 through the pH adjusting device; add solid salt into the draw liquid tank V-02 to adjust the draw The conductivity of the drawn liquid in the liquid tank V-02 reaches the preset value of 150-160ms / cm;

[0097] S2: Open the first valve 2WV1, the second valve 2WV2, the feed liquid pump P-01 and the feed liquid side bag filte...

Embodiment 3

[0106] This embodiment provides a method for multi-mode wastewater treatment by forward osmosis technology. The difference between this embodiment and Embodiment 2 is:

[0107] In step S3, the fourth valve 2WV4, the fifth valve 2WV5, the draw liquid pump P-02 and the draw liquid side bag filter F-02 are opened, and within the set time, the While the circulating feed liquid is concentrated on the feed liquid side of the forward osmosis membrane unit 1, the start and stop of the salt replenishment device is controlled by the draw liquid conductivity meter AIT02 to keep the draw liquid tank V-02 The conductivity of the internal draw solution remains unchanged until the set time is reached, and the wastewater treatment is completed;

[0108] Wherein, the method for controlling the start and stop of the salt replenishing device by the draw solution conductivity meter AIT02 includes: when the conductivity of the draw solution measured by the draw solution conductivity meter AIT02 is...

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Abstract

The invention belongs to the technical field of wastewater treatment, and discloses a system and a method for treating wastewater in multiple modes by a forward osmosis technology. The system comprises a feed liquid tank, a feed liquid pump, a feed liquid side bag type filter, a forward osmosis membrane module, a draw liquid tank, a draw liquid pump, a draw liquid side bag type filter, a salt supplementing device, a physical cleaning water tank, a physical cleaning water pump, a chemical cleaning water tank and a chemical cleaning water pump. The system and the method provided by the invention can achieve a good concentration effect on high-salt and high-organic wastewater from different sources.

Description

technical field [0001] The invention belongs to the technical field of wastewater treatment, and more specifically relates to a system and method for multi-mode wastewater treatment by forward osmosis technology. Background technique [0002] High-salt and high-concentration organic wastewater generally refers to wastewater with a total dissolved solids (TDS) greater than 3.5% (mass fraction) and a chemical oxygen demand (CODcr) of more than 1000 mg / L, or even tens of thousands of mg / L. This type of wastewater comes from a wide range of sources, one is chemical wastewater, pharmaceutical wastewater, coking wastewater, papermaking wastewater, and landfill leachate discharged from various industrial and agricultural production processes such as chemical industry, pharmaceuticals, coking, papermaking, and landfill; the other is Reverse osmosis concentrated water in the recycling process of industrial wastewater. High-salt and high-concentration organic wastewater is characteri...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F9/02B01D61/00B01D65/02B01D65/06
CPCC02F9/00B01D61/002B01D65/02B01D65/06C02F2209/03C02F2209/05C02F2209/42C02F1/001C02F2301/08B01D2321/04C02F2303/16B01D2321/16
Inventor 常江张志强王佳伟刘国梁王浩杨炼李烨邱浩然孙冀垆王欢欢
Owner BEIJING DRAINAGE GRP CO LTD
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