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MBR (membrane bioreactor)-based system and method for oil refining wastewater biochemical treatment and membrane component cleaning method

A technology for oil refinery wastewater and biochemical treatment, applied in the field of water treatment, can solve problems such as surface damage of membrane materials, and achieve the effects of short generation period, good adaptability, and shortened treatment process

Active Publication Date: 2014-04-16
ZHEJIANG SHUANGYI ENVIRONMENTAL PROTECTION TECH DEV
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Problems solved by technology

At the same time, oily pollutants generally need to be cleaned with alkaline substances, but strong alkalinity will cause damage to the surface of the membrane material, so the choice of membrane cleaning method is one of the keys to ensure the stability of the membrane flux

Method used

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  • MBR (membrane bioreactor)-based system and method for oil refining wastewater biochemical treatment and membrane component cleaning method
  • MBR (membrane bioreactor)-based system and method for oil refining wastewater biochemical treatment and membrane component cleaning method
  • MBR (membrane bioreactor)-based system and method for oil refining wastewater biochemical treatment and membrane component cleaning method

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Embodiment

[0039] The oil refinery wastewater treated by oil separation + vortex concave air flotation + dissolved air flotation enters the aerobic aeration tank 1, and the domestic sewage also enters the aerobic aeration tank 1 after passing through the basket grid 10 to remove large particles and suspended solids. Domestic sewage can bring exogenous bacterial populations. The hydraulic retention time (HRT) of aerobic aeration tank 1 is 0.5h, the sludge age is 0.5d, and the sludge load is 3 kgBOD 5 / kgMLSS·d, the sludge can form microbial populations with short generation time, strong activity and strong adsorption capacity, and a large amount of oily substances insoluble in water are adsorbed in the sludge. Oxygen is supplied to the microorganisms through the aeration fan 11 of the aerobic tank, but the low-oxygen state (dissolved oxygen is lower than 1 mg / L) is maintained, which is beneficial to the growth of facultative microorganisms. The sludge adsorbed with oily substances is sep...

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Abstract

The invention discloses an MBR (membrane bioreactor)-based system and method for oil refining wastewater biochemical treatment and a membrane component cleaning method. A biochemical treatment system comprises an aerobic aeration tank, a middle sedimentation tank, an anoxic tank and a membrane bioreactor. The aerobic aeration tank allows pretreated oil refining wastewater to enter, and the middle sedimentation tank connected with the aerobic aeration tank is used for separation mud and water in the aerobic aeration tank to enable part of sludge to be discharged and part of precipitated sludge to flow back into the aerobic aeration tank. The anoxic tank is connected with the middle sedimentation tank, supernatant in the middle sedimentation tank enters the anoxic tank for denitrification, and the membrane bioreactor which forms an organic pollutant main removing unit is connected with the anoxic tank. The MBR system membrane component cleaning method includes: air scrubbing, online backwashing, online chemical cleaning and offline cleaning, especially online cleaning adopts high-concentration NaClO solution and low-concentration NaClO solution alternately, and offline cleaning adopts sodium dodecyl sulfate and sodium carbonate solution for cleaning or NaClO solution for cleaning.

Description

technical field [0001] The present invention relates to a biochemical treatment system and treatment method for oil refinery wastewater based on membrane-bioreactor (MBR) technology and a cleaning method for membrane components, which is used for the biochemical treatment process of advanced treatment and reuse of oil refining wastewater in the petroleum refining industry , belongs to the technical field of water treatment. Background technique [0002] As a strategic resource, petroleum plays an important role in the development of the national economy, but a large amount of waste water will be generated in the process of petroleum exploitation and petroleum refining, especially in the process of petroleum refining, crude oil needs to be dehydrated and desalted. During this process, a large amount of wastewater with complex components, high oil content, high salt content and poor biodegradability will be produced. At the same time, according to the development strategy of ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C02F9/14B01D65/02B01D65/06
Inventor 陈吕军李荧郑炜李伟
Owner ZHEJIANG SHUANGYI ENVIRONMENTAL PROTECTION TECH DEV
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