Zero-discharge treatment method for offshore-platform domestic sewage

A technology for domestic sewage and offshore platforms, applied in water/sewage multi-stage treatment, water/sludge/sewage treatment, chemical instruments and methods, etc. problems, to achieve the effect of reducing COD and suspended matter load, ensuring long-term continuous and stable operation, and avoiding poor impact load resistance

Inactive Publication Date: 2016-01-13
CHINA NAT OFFSHORE OIL CORP +3
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The main factors affecting the treatment of domestic sewage on offshore platforms by biochemical methods are dissolved oxygen, water temperature, nutrients, pH value and organic load rate, etc. There are mainly problems in the following aspects when using biochemical methods to treat domestic sewage on platforms: 2) Taking the Bohai sea area as an example, when the temperature in winter is low, the ability of microorganisms to degrade organic matter is greatly reduced; 3) When the system stops running for a period of time, it is also easy to cause Microorganisms die because of lack of nutrients; 4) The unevenness of sewage production on the platform makes the sewage entering the sewage treatment device have a certain impact, which has a certain impact on microbial activities; 5) The sewage treatment in the aeration tank requires more For a long time, a larger space is required; 6) Since some platforms use seawater to flush the toilet, the salt content in the sewage is high, and the microbial population in the high-salt environment is simple, the impact resistance is worse, and the treatment effect is not ideal
The principle is to mix seawater and domestic sewage, flow through the electrolytic cell, and generate ClO - To disinfect and oxidize domestic sewage, the electrolysis method does not require additional use of chemicals, occupies a small area, and is easy to operate and maintain.
[0009] The above three commonly used treatment methods currently have unstable long-term operation effects and excessive discharge of COD in the effluent, which can no longer meet the increasingly stringent marine environmental protection status

Method used

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  • Zero-discharge treatment method for offshore-platform domestic sewage
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Examples

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specific example 1

[0028] The amount of domestic sewage produced by a fixed facility in the South China Sea is 72m 3 / d, the conductivity of sewage is between 25000-33000μS / cm, Cl - Between 10000-150000mg / L, COD between 600-1200mg / L, and ammonia nitrogen between 50-100mg / L, the original MBR type domestic sewage treatment system cannot meet the requirements of sea discharge treatment. Sewage zero discharge treatment method "pretreatment + MBR + internal circulation photocatalytic oxidation + reuse combined process" treatment, sewage residence time is 2h, effluent COD≤125mg / L, BOD 5 ≤10mg / L, ammonia nitrogen ≤5mg / L, SS≤5mg / L, Escherichia coli ≤15 / L, and all the effluent is used for flushing the toilet. Specific example two:

specific example 2

[0029] The amount of domestic sewage produced by a fixed facility in the Bohai Sea is about 40m 3 / d, the conductivity of sewage is between 20000-30000μS / cm, Cl - Between 9000-140000mg / L, COD between 550-1000mg / L, ammonia nitrogen between 50-100mg / L, the original electrolytic domestic sewage treatment system often breaks down due to the excessive load of COD and suspended solids , can not meet the treatment requirements, after the zero-discharge treatment method of domestic sewage on the offshore platform "pretreatment + MBR + internal circulation photocatalytic oxidation + recycling combined process" treatment of the present invention, the sewage residence time is 1h effluent COD≤125mg / L, BOD 5 ≤8mg / L, ammonia nitrogen ≤7mg / L, SS≤5mg / L, Escherichia coli ≤10 / L, all effluent is used for flushing toilets.

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Abstract

The invention discloses a zero-discharge treatment method for offshore-platform domestic sewage. According to the method, a combined process of pretreatment, MBR biochemistry, internal circulation photoelectrocatalytic oxidation and reuse is adopted; the wastewater of the offshore-platform domestic sewage undergoes crushing treatment via a garbage crushing pump, oil-water separation treatment via an oil skimmer and filtration treatment via a hair filter by passing through a pretreatment unit; the treated wastewater enters an MBR device by passing through a water supply pump for treatment; after the wastewater is treated by the MBR device, effluent flows into an inner circulation photoelectrocatalystic oxidation device and retains for 0.5 to 2 h, wherein the effluent is used for toilet flushing and deck flushing of the platform; and the sludge generated by the MBR device and the inner circulation photoelectrocatalytic oxidation device is treated by a sludge compressor and regularly shipped back to land for treatment. The method provided by the invention realizes zero discharge of the offshore-platform domestic sewage by using an integrated process method, and can solve a series of environmental problems caused by offshore-platform domestic sewage discharge beyond standards.

Description

technical field [0001] The invention relates to the technical field of environmental engineering sewage treatment, in particular to a complete set of methods for treating domestic sewage on offshore platforms with zero discharge. Background technique [0002] With the development of offshore oil, more and more attention has been paid to the pollution of marine environment by domestic sewage on offshore platforms. The "International Convention for the Prevention of Pollution from Ships" formulated by the International Maritime Organization (IMO) in 1973 has made strict regulations on the prevention of pollution caused by domestic sewage. my country formulated the "Ship Pollutant Discharge Standard" in 1983, and the "Sea-going Ship Anti-pollution Structure and Equipment Specification" in 1986, which regulates the treatment and equipment of domestic sewage from ships. In the early 1970s, foreign countries began to conduct research and development of marine sewage treatment equ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F9/14C02F9/08C02F101/30
Inventor 滕厚开谢日彬谢陈鑫吉峰李锋杨崇明赵慧秦微钱光磊
Owner CHINA NAT OFFSHORE OIL CORP
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