Rotating magnetic field-membrane bioreactor joint ship oily sewage treatment method

Abstract

The invention relates to a rotating magnetic field-membrane bioreactor joint ship oily sewage treatment method. The method comprises the following steps of sludge acclimatization, magnetic powder pretreatment, magnetic powder adding, rotating magnetic field increasing and cycle treatment. Accordingly, the external environment of microorganisms in activated sludge and the physical property of waterin thalli can be changed, the structure and the activity of protein and enzyme are changed, the physiological function of the microorganisms is affected, microorganism growth is promoted, and the activity of the microorganisms is improved; by putting magnetic powder in the activated sludge, the property of the activated sludge is improved conveniently, the sludge floccule particle size is increased, the sludge filtration resistance is lowered, floccule which is scattered, porous and good in air permeability is formed, and the pollution rate of an MBR membrane can be effectively slowed down; under the action of magnetic field periodicity, the magnetic powder drives the sludge rotating magnetic field to be away from the membrane surface periodically, the accumulation degree of gummy substances on the membrane surface can be lowered, and meanwhile the contribution degree of a filter cake layer to membrane pollution is reduced, so that the membrane pollution rate is greatly lowered.

Description

technical field [0001] The invention relates to a method for treating oily sewage, in particular to a method for treating oily sewage from ships by utilizing a rotating magnetic field-MBR combined technology. Background technique [0002] With the rapid development of the global shipping industry, marine pollution from ships has become more and more serious. According to the research of the International Maritime Organization (IMO), in addition to the malicious dumping of garbage, various leakages generated during the navigation of ships have reached 160,000-350,000 tons per year. Among these leakages, especially the emulsified oil discharged from the bilge water of various ships. [0003] With the promulgation of MEPC107.(49) resolution, more attention has been paid to the removal of emulsified oil. The general oil-water separators circulating in the market are difficult to effectively remove the emulsified oil, and the oil content in the effluent often cannot meet the re...

AI Technical Summary

Problems solved by technology

However, the following problems exist during the operation of the MBR. On the one hand, the oil-removing microorganisms are easily affected by external factors such as temperature, resulting in a decrease in biological activity and a decrease in the degradation efficiency of organic matter, resulting in a longer operating time of the reactor; on the other hand, due to the small membrane pores , the suspended oil, higher concentration of organic matter, and suspended matter in the container pool will have a certain blocking effect on the membrane pores, thereby reducing the membrane permeability, aggravating membrane fouling, and reducing the effective operating cycle of the membrane.

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