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Treatment technology for recycling reverse osmosis concentrated water

A reverse osmosis concentrated water and treatment process technology, which is applied in the field of reverse osmosis concentrated water reuse treatment process, can solve the problems of limited reuse water, huge investment, and increased salinity of influent water.

Inactive Publication Date: 2013-01-02
BMEI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] 1) The reflux method, RO concentrated water reflux can improve the recovery rate, increase the membrane surface flushing flow rate, and reduce fouling; but if the reflux rate is too high, it will increase the salinity of the influent water, increase the burden on the membrane, and affect the membrane life.
[0004] 2) It can be reused as production water. Since there is no suspended matter in RO concentrated water, it contains antiscalant ingredients and has a certain water pressure, it can be used as backwash water, dust removal water, ash and slag washing water, and cooling water for the filter device. Such recycled water is limited
However, economical and high-quality hydrophobic microporous membranes have not yet been developed, and this method requires huge investment and high operating costs.

Method used

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  • Treatment technology for recycling reverse osmosis concentrated water

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] Such as figure 1 Shown, a kind of reverse osmosis concentrated water reuse treatment process comprises the following steps:

[0022] 1) The reverse osmosis concentrated water with a TDS of about 2000mg / L and a hardness of 12.4mmol / L is added to the raw water tank, and the water quality and water quantity are homogenized by stirring and mixing;

[0023] 2) The effluent from the raw water tank is lifted by the raw water pump and added to the mechanical acceleration clarification tank. The softening reaction and flocculation clarification process are carried out in the mechanical acceleration clarification tank. Calcium hydroxide and calcium carbonate are added to form metal ions to precipitate, so as to remove the temporary hardness and Permanent hardness; adding polymerized ferric sulfate flocculant, under the action of flocculant, the precipitated matter forms a larger alum flower precipitate, the precipitate is collected by pressure filtration, and the supernatant ente...

Embodiment 2

[0029] Such as figure 1 Shown, a kind of reverse osmosis concentrated water reuse treatment process comprises the following steps:

[0030] 1) The reverse osmosis concentrated water with a TDS of about 2500mg / L and a hardness of 15mmol / L is added to the raw water tank, and the water quality and water quantity are homogenized by stirring and mixing;

[0031] 2) The effluent from the raw water tank is lifted by the raw water pump and added to the mechanical acceleration clarification tank. The softening reaction and flocculation clarification process are carried out in the mechanical acceleration clarification tank. Calcium hydroxide and calcium carbonate are added to form metal ions to precipitate, so as to remove the temporary hardness and Permanent hardness; add polyaluminum chloride flocculant, under the action of flocculant, the precipitated matter forms a larger alum flower precipitate, the precipitate is collected by pressure filtration, and the supernatant enters the nex...

Embodiment 3

[0037] Such as figure 1 Shown, a kind of reverse osmosis concentrated water reuse treatment process comprises the following steps:

[0038] 1) The reverse osmosis concentrated water with a TDS of about 3000mg / L and a hardness of 15mmol / L is added to the raw water tank, and the water quality and water quantity are homogenized by stirring and mixing;

[0039] 2) The effluent from the raw water tank is lifted by the raw water pump and added to the mechanical acceleration clarification tank. The softening reaction and flocculation clarification process are carried out in the mechanical acceleration clarification tank. Calcium hydroxide is added to precipitate metal ions to reduce the total hardness in the water. Ferric sulfate and polyacrylamide flocculants, under the action of flocculants, the precipitated matter forms larger alum precipitates, the precipitates are collected by pressure filtration, and the supernatant enters the next treatment process;

[0040] 3) Adjust the PH ...

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Abstract

The invention relates to a treatment technology for recycling reverse osmosis concentrated water, comprising the following steps of: 1) adding reverse osmosis concentrated water into a raw water pond; 2) pumping the water discharged out of the raw water pond to be added into a mechanical accelerating settling pond, and carting out softening reaction and flocculation clearing process in the mechanical accelerating settling pond; 3) adjusting the pH value of the liquid supernatant which is treated by the mechanical accelerating settling pond to 6.5-8.5, and passing through a filter; 4) adding the filtered wastewater into a first-grade electroosmosis system to be desalted; 5) adding thin liquid treated by the first-grade electroosmosis into a second-grade electroosmosis system, wherein the concentrated liquid obtained by the second-grade electroosmosis system reflows to the first-grade electroosmosis system, and the fresh water enters into a recycle pool; and 6) recycling the fresh water in the recycle pool according to the actual need. According to the treatment technology for recycling the reverse osmosis concentrated water, the hardness, the TDS (total dissolved solids), the organic matters and other impurities in wastewater can be removed by means of softening, clearing, filtering and electroosmosis, and the problem of the recycle of the reverse osmosis concentrated water which reaches to the standard can be thoroughly solved.

Description

technical field [0001] The invention relates to a waste water treatment process, in particular to a reverse osmosis concentrated water reuse treatment process. Background technique [0002] At present, when reverse osmosis membrane is used as the treatment process of industrial water supply, 1 / 4-1 / 3 concentrated water will be produced. The total hardness and total dissolved solids (TDS) content in the concentrated water are relatively high, and contain antiscalant components. If Direct discharge may cause pollution to soil, surface water, ocean, etc., and the utilization rate of water resources is low. The main treatment methods of reverse osmosis concentrated water in China mainly have the following shortcomings: [0003] 1) The reflux method, RO concentrated water reflux can improve the recovery rate, increase the membrane surface flushing flow rate, and reduce fouling; but if the reflux rate is too high, it will increase the salinity of the influent, increase the burden ...

Claims

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Application Information

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IPC IPC(8): C02F9/06
Inventor 徐明月孙雅莉翁晓敏张希华李永华
Owner BMEI
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