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Method for treating reverse osmosis concentrated water

A reverse osmosis concentrated water and treatment method technology, applied in the field of industrial wastewater treatment, can solve problems such as complex process, high operating cost, and large investment

Active Publication Date: 2011-05-04
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This process is still in the research stage due to large investment, complex process and high operating cost.

Method used

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  • Method for treating reverse osmosis concentrated water
  • Method for treating reverse osmosis concentrated water

Examples

Experimental program
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Effect test

Embodiment 1

[0022] Refining sewage of a petrochemical plant, including: crude oil tanks and oil-water separation tanks of various devices or cut-off water of product oil tanks, machine pump cooling water, cold coke water cut-off water, tank washing vehicle drainage and pre-drainage in the production area. After more than 80 hours of two-stage biochemical treatment, the sewage has a COD of 40mg / L, which can reach the discharge standard. The petrochemical plant passes the waste water through fiber filtration + activated carbon filtration + integrated treatment, blends part of the fresh water, and then uses ultrafiltration + reverse osmosis to reuse 75%. Treat and reuse 60%, the COD in the remaining concentrated water is 100mg / L, and the organic pollutants are mainly: naphthenic acid and polydimethylsiloxane, BOD 5 Zero, extremely poor biodegradability. The waste water is treated as follows:

[0023] 1) First, add 3 mg / L of sodium hypochlorite to the waste water, filter through a laminated...

Embodiment 2

[0029] The refinery sewage of a petrochemical plant is composed of crude oil tanks and oil-water separation tanks of various devices or cut water of finished oil tanks, machine pump cooling water, cold coke water cut water, tank washing vehicle drainage and pre-drainage in the production area. After the sewage is treated by three-stage biochemical treatment, the COD is 40-50 mg / L. The petrochemical plant reuses 75% of the wastewater through quicksand filter + fiber ball filtration + ultrafiltration + reverse osmosis, and the remaining 25% of the concentrated water is COD 170mg / L, the main components of organic pollutants are naphthenic acid, BOD 5 2.2mg / L, BOD 5 / COD is 0.01, and the biodegradability is poor. The waste water is treated as follows:

[0030] 1) First, add 3 mg / L of sodium hypochlorite to the waste water, filter through a laminated filter with a filtration accuracy of 100 μm, and the turbidity of the effluent cannot be detected;

[0031] 2) The effluent of the...

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Abstract

The invention provides a method for treating reverse osmosis concentrated water. In the method, the process flows of a laminated filter, heterogeneous catalytic ozone oxidation reaction, an ozone destruction tower and a biochemical reaction tank are adopted. The method comprises the following steps of: adding sodium hypochlorite into the reverse osmosis concentrated water produced in the recycling process of oil refining production wastewater subjected to biochemical treatment and membrane process treatment, sterilizing, filtering by using the laminated filter, fully mixing with ozone, adding into a reactor filled with a zirconium titanate catalyst and performing ozone oxidation; and performing biochemical treatment by using a biochemical reactor with special biological bacteria, wherein the chemical oxygen demand (COD) of effluent after the reverse osmosis concentrated water is treated is below 60mg / L.

Description

technical field [0001] The invention relates to a treatment method for industrial wastewater, in particular to a treatment method for reverse osmosis concentrated water produced during wastewater reuse treatment. Background technique [0002] As an efficient desalination technology, reverse osmosis technology is widely used in the field of wastewater reuse in petrochemical systems. Membrane sewage reuse process uses the effluent from the sewage treatment plants of various enterprises after more than two levels of biochemical treatment as the reuse water source. The COD of the sewage is about 60mg / L, and the biochemical property is poor. The recovery rate of the membrane recycling process is generally controlled at about 75%, and at the same time, about 25% of concentrated water is produced. Pollutants such as salt and COD in the concentrated water are concentrated by about 4 times, so that the reverse osmosis concentrated water cannot be discharged directly. At present, dom...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F9/14
Inventor 龚小芝栾金义刘正彭海珠赵鹏赵辉孙杰
Owner CHINA PETROLEUM & CHEM CORP
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