Device and method for treating ship black water and gray water

Abstract

The invention provides a ship black water and ash water treatment device and method. The device comprises a pretreatment unit, a biological treatment unit, a photoelectrocatalytic reaction unit and a sludge treatment unit, wherein ash water is mixed together with simply treated black water after being subjected to ultrasonic enhanced coagulation and efficient gravity type solid-liquid separation treatment, and the mixture enters the biological treatment unit; sewage in the biological treatment unit is treated by an anaerobic pond, an anoxic pond and an MBR pond and enters a clear water tank, BOD and nitrogen and phosphorus pollutants in the water are removed in the biological treatment unit, and effluent of the clear water pond enters the photoelectrocatalytic reaction unit; organic pollutants difficult to degrade in the sewage and bacteria in water are degraded and removed under the synergistic action of photocatalysis and electrocatalysis, the sewage is filtered finally by a membrane assembly and discharged, and the quality of the discharged water meets the recycling standard; the sludge treatment unit simply dewaters sludge discharged from the biological treatment unit. The device and the method are simple and convenient to operate and efficiently treat ship black water and ash water, so that the black water and the ash water meet the recycling standard.

Description

technical field [0001] The invention relates to a device for treating domestic sewage of ships, and also relates to a method for treating domestic sewage of ships. Specifically, it is a device and method capable of efficiently treating ship black water and gray water. Background technique [0002] In recent years, due to the increase of transportation costs, the proportion of the shipping industry in international commercial transportation has increased year by year. According to statistics, about 90% to 95% of goods are transported by ships. The development of the shipping industry has brought huge challenges to the ecological environment of water bodies. The United Nations Maritime Organization (International Maritime Organization, IMO) has continuously improved the domestic sewage discharge standards of ships in recent years. The MEPC.227(64) resolution, which was implemented on January 1, 2016, is more stringent than the previous standards. Resolution MPEC.227(64) not...

AI Technical Summary

Problems solved by technology

[0006] After many years of research and development of ship domestic sewage treatment technology at home and abroad, the bottleneck problems encountered by the existing treatment technology in the treatment of ship sewage are mainly: poor solid-liquid separation effect due to ship swaying, tilting, etc.; tolerance to water quality and quantity The impact load is poor; the volume of the device is large when dealing with a large amount of water; the effect of nitrogen and phosphorus removal is poor; there is no sewage reuse treatment device

At present, gray water is usually mixed with black water and treated together, but the joint treatment has the following problems: (1) Due to the presence of surfactants such as detergent in gray water, there is a large amount of emulsified oil in the water, and it is difficult to use a general oil-water separation device (2) Animal and vegetable oils in gray water are likely to cause blockage of pipelines and equipment during collection and treatment; (3) Pollutants such as oils and surfactants in ship gray water will significantly inhibit the subsequent biodegradation and flocculation process , the microbial degradation efficiency is low

In the invention patent CN 105236685 A, the combination of MBR and internal circulation photoelectric catalytic oxidation is used to treat ship domestic sewage. Compared with the conventional ship domestic sewage treatment process, the treatment effect of this invention is significantly enhanced, but the phosphorus removal effect is not good enough, and the device is relatively Complicated and difficult to operate and manage

However, the traditional PVDF membrane has low mechanical strength and is prone to damage, and the surface of the PVDF membrane exhibits strong hydrophobicity. Due to the adsorption of the separated substance on the hydrophobic surface, it is easy to cause membrane pollution, which not only leads to excessive water quality, but also reduces The service life of the membrane, and the replacement of the membrane module will increase the operating cost of the MBR, so the modified PVDF membrane is developed and applied in the MBR process. The modified PVDF membrane can not only improve the mechanical strength, but also inhibit membrane fouling to a certain extent

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