Oil-refining wastewater treatment method and device

Abstract

The invention discloses an oil-refining wastewater treatment method and device, belonging to the technical field of industrial wastewater treatment and reuse. The method comprises the following steps of: firstly performing pretreatment on oil-refining wastewater to obtain pretreated outlet water; then utilizing the pretreated outlet water to perform acclimation and culture of active sludge in a stripping type internal circulation membrane bioreactor, and adding a membrane component and powder activated carbon during the acclimation and culture process of the active sludge; and enabling the pretreated outlet water to enter the stripping type internal circulation membrane bioreactor for treatment after the end of acclimation and culture of the active sludge. According to the method disclosed by the invention, the removal efficiency of organic matters, petroleum and ammonia nitrogen in the oil-refining wastewater of the membrane bioreactor can be effectively improved, the anti-shock loading capability of the system and the stability of water quality of the outlet water are improved, and the water quality of the outlet water after treatment can achieve the second-stage emission standard of petrochemical industry, which is stipulated by GB8978-1996. According to the method disclosed by the invention, the membrane pollution rate can be effectively reduced, and the pollution and damages to a membrane by the petroleum can be effectively prevented under the situation that the petroleum content in inlet water is higher.

Description

technical field [0001] The invention belongs to the technical field of industrial wastewater treatment and reuse, and relates to the treatment of petroleum-containing industrial wastewater such as oil refining wastewater, petrochemical wastewater and oilfield produced water, and specifically refers to a method for treating oil refining wastewater based on membrane bioreactor technology and devices. Background technique [0002] Refinery wastewater is a type of wastewater with a wide range of sources and complex properties, mainly including oily wastewater, sulfur-containing wastewater, alkali-containing wastewater, salt-containing wastewater, phenol-containing wastewater, production wastewater and refinery domestic sewage. The main characteristics of oil refinery wastewater include: 1) large discharge volume; 2) large changes in water quality and volume, with a certain degree of impact load; 3) complex composition, and contain a certain amount of refractory pollutants and to...

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Problems solved by technology

[0006] Aiming at the defects of the prior art, the present invention provides a refinery wastewater treatment method and device. The present invention can effectively improve the removal efficiency of organic matter, petroleum and ammonia nitrogen in the refinery wastewater by the membrane bioreactor, and improve the impact load resistance of the system and the stability of effluent water quality; at the same time, it can effectively reduce the membrane fouling rate, and effectively prevent the pollution and damage of petroleum to the membrane when the influent petroleum content is high

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