Method for treating salt-containing sewage

A treatment method and technology for sewage, applied in biological water/sewage treatment, neutralized water/sewage treatment, oxidized water/sewage treatment, etc. Reduced running cost and strong adsorption effect

Active Publication Date: 2010-12-01
CHINA PETROLEUM & CHEM CORP +1
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  • Application Information

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Problems solved by technology

Experiments have shown that high-concentration saline wastewater from oil refineries contains about 8% to 20% of non-biodegradable substances, and o

Method used

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Embodiment

[0024] The treatment method of the present invention is used to treat mixed wastewater such as drainage from an electric desalination device in a domestic oil refinery, liquid hydrocarbon alkali slag sewage, gasoline alkali slag (first deodorized by a wet oxidation device), diesel oil alkali slag sewage, and cut water from oil tank farms. to process. Mixed wastewater COD 3000mg / L, BOD5 1200mg / L, petroleum 20mg / L, ammonia nitrogen 50mg / L, Kjeldahl nitrogen 120mg / L, pH 12.38, salt content 12.3g / L, volatile phenol 400mg / L, thiosulfuric acid Salt 1000mg / L. The combined process of SBR+ozone catalytic oxidation+biological filter of the present invention is used to treat mixed wastewater. Firstly, concentrated sulfuric acid is used to neutralize the wastewater so that the pH of the mixed wastewater is about 10, and then the mixed wastewater is treated.

[0025] The SBR aeration tank used in this example has an effective volume of 10L, and a perforated aeration pipe is provided at th...

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PUM

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Abstract

The invention relates to a method for treating salt-containing sewage. The pH value of the salt-containing sewage is adjusted to between 8 and 12, the salt-containing sewage is biochemically treated by an activated sludge process, the effluent after the activated sludge process treatment is treated by an ozone-catalytic oxidation process adopting a solid catalyst, and the effluent after the ozone-catalytic oxidation process treatment is discharged through a biofilter; and in the ozone-catalytic oxidation process adopting the solid catalyst, the solid catalyst is granular activated carbon loaded with an active component which is one or more of tin, copper, manganese, titanium, cobalt, vanadium and nickel. The method can effectively purify the sewage which has high salt content and is refractory to biodegrade, and the effluent after treatment has the COD of less than or equal to 50 mg/L and the NH3-N of less than or equal to 8 mg/L, so that the strict sewage discharge standard of developed regions is met. The method has the advantages of simple treatment process, no need of sewage dilution, clean and clear effluent after treatment and realization of direct standard discharge.

Description

technical field [0001] The invention relates to a treatment method for oil refinery sewage, which is particularly suitable for the standard-reaching discharge treatment method of high-concentration saline sewage in oil refineries. Background technique [0002] At present, oil refinery sewage generally adopts a centralized mixed treatment method, that is, the oily sewage, salty sewage, acid water stripping purified water and domestic sewage discharged from various production units are mixed and then treated through the oil separation-flotation-biochemical combination process and then discharged. Can still meet COD≤100mg / L, NH 3 - National emission standard of N≤15mg / L. However, with the deteriorating quality of crude oil processed by refining and chemical enterprises and the increasingly stringent requirements for wastewater reuse due to water shortages, this method and process of centralized and mixed wastewater treatment has increasingly exposed larger problems. First of ...

Claims

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Application Information

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IPC IPC(8): C02F9/14C02F1/66C02F3/12C02F1/78
CPCY02W10/10
Inventor 王明星郭宏山韩建华许谦
Owner CHINA PETROLEUM & CHEM CORP
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