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Treatment method of circulating water sewage

A treatment method and sewage technology, which are applied in water/sewage treatment, neutralized water/sewage treatment, oxidized water/sewage treatment, etc., can solve the problem of effectively removing the hardness of untreated sewage, and achieve easy operation and maintenance, and technical economy. Good, strong adaptability to the environment

Inactive Publication Date: 2020-12-25
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This method is only aimed at the removal of COD and TOC caused by water treatment chemicals, and does not effectively remove hardness in sewage

Method used

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  • Treatment method of circulating water sewage

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0052] The main water quality characteristics of circulating water sewage include: oil content 1.6mg / L, conductivity 2200μS / cm, suspended solids 95mg / L, COD 160mg / L, Cl - 470mg / L, SO 4 2- 620mg / L, dissolved silicon 45mg / L, pH 9, total nitrogen 40mg / L in terms of N element, total hardness 200.

[0053] The processing steps are as follows:

[0054] Step 1, the circulating water sewage enters into the high-efficiency hardening removal filter unit, and the hardening agent sodium hydroxide and sodium carbonate are added. After the circulating water sewage and the hardening agent are contacted and reacted, the pH of the water is controlled at 10.8, reacted for 20 minutes, and then the membrane Filtration to form high-efficiency hard-removal filtered water; the filtration pressure of the membrane filtration unit is 0.1MPa, the membrane material is polytetrafluoroethylene, and the membrane pore size is 0.2μm; the filter residues are solidified and then transported outside for treatm...

Embodiment 2

[0075] The main water quality characteristics of circulating water sewage include: oil content 1.4mg / L, electrical conductivity 3500μS / cm, suspended solids 110mg / L, COD 130mg / L, Cl - 500mg / L, SO 4 2- 660mg / L, dissolved silicon 70mg / L, pH 8, total nitrogen 25mg / L in terms of N element, total hardness 170.

[0076] The processing steps are as follows:

[0077] Step 1, the circulating water sewage enters into the high-efficiency hardness removal filter unit, and the hardening agents sodium hydroxide and sodium carbonate are added. After the circulating water sewage and the hardening agent are contacted and reacted, the pH of the water is controlled at 11.5, and the reaction is carried out for 25 minutes. After that, the membrane Filtration to form high-efficiency hard-removal filtered water; the filtration pressure of the membrane filtration unit is 0.1MPa, the membrane material is polytetrafluoroethylene, and the membrane pore size is 0.18μm; the filter residues are solidified...

Embodiment 3

[0098] The main water quality characteristics of circulating water sewage include: oil content 1.5mg / L, conductivity 4000μS / cm, suspended solids 100mg / L, COD 180mg / L, Cl - 550mg / L, SO 4 2- 700mg / L, dissolved silicon 55mg / L, pH 8.5, total nitrogen 35mg / L in terms of N element, total hardness 200.

[0099] The processing steps are as follows:

[0100] Step 1, the circulating water sewage enters into the high-efficiency dehardening filter unit, adding the hardening agents sodium hydroxide and sodium carbonate, the pH of the water after the contact reaction between the circulating water sewage and the hardening agent is controlled at 10.8, the circulating water sewage and the dehardening agent The hard agent is reacted for 25 minutes, and then membrane filtration is performed to form high-efficiency hard removal and filtered water; the filtration pressure of the membrane filtration unit is 0.1MPa, the membrane material is polytetrafluoroethylene, and the membrane pore size is 0....

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Abstract

The invention provides a treatment method of circulating water sewage, which comprises the following steps of carrying out hardness removal filtration treatment, ozone oxidation treatment, denitrification treatment, ultrafiltration treatment and reverse osmosis treatment on the circulating water sewage to obtain reverse osmosis produced water and reverse osmosis concentrated water, wherein thereverse osmosis produced water is used to make up water for the circulating system, and carrying out hardness removal filtration treatment, ozone oxidation treatment, denitrification treatment and adsorption treatment on the reverse osmosis concentrated water to obtain adsorption treatment effluent. According to the method, on the basis of effectively treating the circulating water sewage, the recycling of water resources is realized, and the discharge water reaches the discharge standard.

Description

technical field [0001] The invention relates to a treatment method for circulating water sewage. Background technique [0002] With the continuous development of social economy, the demand for water resources is increasing, and fresh water resources are becoming increasingly scarce. Strengthening the recycling and utilization of water resources and reducing sewage discharge are one of the important environmental protection issues currently facing. The water used by the industrial circulating water system accounts for a relatively large proportion of the total industrial water, about 70%-80%. During the circulation process of the circulating water system, the water evaporates continuously, and the inorganic salt ions and organic matter are gradually concentrated. When the concentration ratio reaches 3-7 times, a certain volume of sewage needs to be discharged and fresh water is added to generate circulating water sewage. Circulating water sewage has higher chroma and hardnes...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F9/14
CPCC02F1/283C02F1/44C02F1/441C02F1/444C02F1/66C02F1/725C02F1/78C02F3/28C02F5/02C02F9/00C02F2301/08
Inventor 魏玉梅张新妙栾金义彭海珠
Owner CHINA PETROLEUM & CHEM CORP
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