Offshore platform domestic sewage treatment system and method using biochemical electrolytic method

Abstract

The invention discloses an offshore platform domestic sewage treatment system and method using a biochemical electrolytic method.The treatment system comprises a buffer tank (1), a crawler type oil separation plate (2), an oil storage tank (3), a biochemical tank (4), a process pump (5), a membrane filter unit (6), an electrolysis catalytic oxidation device (7), a direct-current power supply system (8), a gas-liquid separation device (9) and a fan (10).The treatment method includes: domestic sewage enters the buffer tank (1) for water quality and water quantity adjustment, grease in the domestic sewage is removed by the crawler type oil separation plate (2), then the domestic sewage sequentially enters the biochemical tank (4), the membrane filter unit (6) and the electrolysis catalytic oxidation device (7) for treatment, the discharged water enters the gas-liquid separation device (9) and is discharged from the bottom, the fan (10) provides compressed air, part of the compressed air is used for aerating the biochemical tank (4), and part of the compressed air enters the gas-liquid separation device (9) and is mixed with gas generated by the electrolysis catalytic oxidation device (7) and discharged from the top.

Description

technical field [0001] The invention belongs to the field of environmental engineering sewage treatment, and relates to a technical method for domestic sewage treatment on an offshore platform, in particular to a system and method for treating domestic sewage on an offshore platform with a biochemical combined electrolysis method. Background technique [0002] In recent years, with the increasing frequency of offshore oil exploration activities, the discharge of domestic sewage from offshore platforms has attracted more and more attention. Domestic sewage treatment on offshore platforms generally adopts physical and chemical methods, biochemical methods, MBR methods and electrolysis methods. Among them, the physicochemical method mainly removes pollutants in water through chemical precipitation. The effluent usually requires a large amount of disinfectant to finally realize sewage discharge. This technical method requires a large amount of chemical dosage and frequent operat...

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Problems solved by technology

However, there are many problems in practical application: (1) The biochemical method mainly provides enough oxygen for the microorganisms by aerating the sewage, and the microorganisms remove most of the organic matter in the water through biodegradation, and then realize the final discharge into the sea through ultraviolet disinfection; However, under normal circumstances, the water output of this method fluctuates greatly, especially the suspended matter in the effluent water is likely to exceed the standard

However, the following common problems exist in the treatment of platform domestic sewage by biochemical methods: ① The composition of wastewater is complex. Domestic sewage not only contains easily degradable substances such as feces, but also contains a large amount of refractory substances such as detergents, detergents, and disinfectants. It is difficult to use biochemical methods. Remove it completely; ②The volume and quality of sewage fluctuate greatly, which is likely to cause load impact on the biochemical system; ③Platforms generally use fresh water or seawater to flush toilets, and the domestic sewage of seawater flushing platforms has a high salt content, resulting in low microbial activity. The effluent water quality fluctuates greatly; ④The sewage contains a large amount of toxic substances, such as disinfectants, etc., resulting in low microbial activity or even complete loss of activity, and once the system collapses, the re-cultivation period will be longer

(3) Ordinary electrolysis method, which mainly produces NaClO by electrolysis of seawater and mixes it with domestic sewage to remove pollutants and kill bacteria in sewage, so as to meet the discharge requirements. Compared with biochemical methods, the electrolysis method occupies a relatively small area, and at the same time It has high sewage treatment efficiency and effluent water quality, but the common electrolysis method needs to add a large amount of seawater, and the loss of the plate is large, easy to scale and block, frequent chemical cleaning and personnel maintenance, resulting in unstable effluent water quality

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