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Method for processing sewage from industrial cycle water

A technology for industrial circulating water and treatment methods, which is applied in neutralization water/sewage treatment, water/sewage multi-stage treatment, water/sludge/sewage treatment, etc., and can solve colloidal substance pollution, high membrane operating pressure, and equipment investment Large and other problems, to achieve the effect of reducing the amount of sewage discharge, reducing sewage discharge, and improving economic benefits

Inactive Publication Date: 2008-05-07
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

These two technologies have the advantages of simple operating equipment, energy saving, high efficiency, no secondary pollution, and fewer operators, but the electro-osmotic membrane technology can only remove charged ions, and is easily polluted by colloidal substances, and the investment in equipment is relatively large; However, the reverse osmosis membrane used in reverse osmosis membrane technology is not only expensive, but also because the reverse osmosis membrane has no selectivity for intercepting ions, the operating pressure of the membrane is high and the membrane flux is limited.
Therefore, it is not suitable to use electro-osmotic membrane technology or reverse osmosis membrane technology for some applications that require large flux and do not require interception or low interception rate for certain substances (such as monovalent salts).

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] Adopt the method of the present invention to process an industrial circulating water system (49 tons / hour of sewage, 147 tons / hour of supplementary water, 3 times of concentration).

[0024] Take 49 tons / hour of sewage (circulating water before going up the tower), add flocculant (polyaluminum chloride, addition amount 3ppm), remove suspended solids (product water turbidity<3NTU) through bag filter treatment, and then Hollow fiber ultrafiltration removes colloids and polymers, etc., and the turbidity of the product water is <0.1NTU, SDI<3).

[0025] Then 37.5 enters the nanofiltration device. The model of the nanofiltration softening membrane module is TS80 from TriSep Company of the United States. use.

[0026] The sewage was reduced from 49 tons / hour (down to 9.5 tons / hour, including 11.5 tons / hour of internal return flow), the replenishment water was reduced from 147 tons / hour to 107 tons / hour, and the actual concentration ratio of the system was increased from 3 ti...

Embodiment 2

[0029] When the water quality of the raw water is extremely bad, the concentration factor cannot be increased, and the operation needs to add acid to adjust the alkalinity. It is difficult for sewage to enter the nanofiltration system directly, so it needs to be softened before adding it into the nanofiltration system. Take 1.3 tons / hour of sewage (circulating water before going up the tower), use its temperature to enter the settling tank, mix with 0.43 tons / hour of concentrated drainage from nanofiltration, add sodium carbonate (150mg / L); calcium oxide (60mg / L ), after coagulation and sedimentation separation, the clear liquid effluent is bag-filtered and then enters the nanofiltration device at 1.7 tons / hour, and the product water at 1.3 tons / hour returns to the circulating water system. The bag filter is used to remove 1.144 tons of solid residue per hour, basically achieving "zero" sewage discharge of water. The resulting solid slag is dried and recovered.

[0030] Equi...

Embodiment 3

[0032] Take the sewage (circulating water before going up the tower) at 36 tons / hour and use its temperature to add flocculant (alkali NaOH,) to remove suspended solids through bag filter pretreatment, and then remove colloids and polymers through hollow fiber ultrafiltration. Then enter the nanofiltration device, 27 tons / hour of produced water replenishes the circulating water system, and 9 tons / hour of concentrated water enters the softening facility settling tank, adds sodium carbonate (126 grams / hour); calcium oxide (1110 grams / hour), mix After coagulation, sedimentation and separation, the clear liquid is replenished to the circulating water. Originally, 49 tons / hour of sewage should be discharged, but now it is 13.4 tons / hour through internal reflux, and 27 tons / hour is recovered by nanofiltration. After coagulation and sedimentation, the clear liquid is discharged to replenish 8.6 tons / hour of circulating water, and the original water supply should be 147 tons / hour The ...

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Abstract

The invention relates to a method for treating industrial circulating water and sewage through the technology of a nano filter film. The invention is characterized in that one part of the sewage is used as the supplementing water of a circulating water system, while the other part is reused after being processed through a nano filter system after the sewage of the industrial circulating cooling water system is flocculated and precipitated and filtered; one part and the other part are added into the circulating water system after being mixed with a certain proportion so as to achieve the reuse of the industrial circulating water, thereby increasing the condensation times of the whole system, decreasing the water implementing quantity and the sewage discharge quantity of the system, and increasing the economic effect of the whole operation.

Description

technical field [0001] The invention relates to a method for treating sewage of industrial circulating water, in particular to a method for treating sewage of industrial circulating water by using nanofiltration membrane technology. Background technique [0002] As we all know, many countries and regions in the world are facing the problem of increasing shortage of water resources. Water conservation, sewage treatment and development of new water sources are equally important. Sewage reuse is one of the important ways to alleviate the crisis of water resources and protect the water environment. [0003] The industrial circulating cooling water system is a large user of water, and its consumption of water is mainly in the following two aspects: (1) In the open circulation system, due to the loss of water due to evaporation, wind blowing, sewage discharge, etc., it is necessary to add fresh water to achieve water loss. balance. (2) Due to the water concentration process and ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F9/04C02F1/66C02F1/50C02F5/00C02F1/52
Inventor 周霖曹栩然平春霞
Owner CHINA PETROLEUM & CHEM CORP
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