Synchronous sludge treatment system of membrane bioreactor and sludge treatment method thereof

Abstract

The invention discloses a synchronous sludge treatment system of a membrane bioreactor and a sludge treatment method thereof. The synchronous sludge treatment system is characterized by consisting ofa reaction tank and a membrane-bioreactor, wherein the membrane-bioreactor is internally provided with a flat sheet membrane; an aeration tube which is connected with an aeration pump is arranged below the membrane-bioreactor. The sludge treatment method of the synchronous sludge treatment system comprises the following steps: pretreating sludge, carrying out membrane biological reactions, and thelike. Compared with the prior art, the membrane pollution velocity is remarkably reduced, COD (Chemical Oxygen Demand) can be removed while the membrane pollution velocity is reduced, the effluent quality is greatly improved, the burden of treatment can be further reduced, the membrane cleaning times and cost can be reduced, the process is simple, the chemical price is low, and a good applicationspace is provided for a later membrane-bioreactor process.

Description

technical field [0001] The invention relates to the field of membrane bioreactor and membrane separation technology, in particular to a treatment system and a treatment method for in-situ membrane pollution prevention and control and synchronous sludge concentration of a membrane bioreactor. [0002] Background technique: [0003] With the improvement of water quality requirements for effluent and reuse, membrane bioreactors are becoming more and more common in practical engineering applications. Membrane Bio-Reactor (Membrane Bio-Reactor) is a wastewater treatment system that organically combines membrane separation technology and biological treatment technology. Membrane Bio-Reactor has high treatment efficiency, good effluent quality, easy automatic control, and simple operation and management. After more than 20 years of development, membrane bioreactor has become one of the main technologies for advanced wastewater treatment. However, the problem of membrane fouling has ...

AI Technical Summary

Problems solved by technology

The formation of biofilm is not only an important part of membrane fouling itself, but also leads to an increase in the viscosity of the membrane to the mixture, making it easier for particulate matter in sewage to adsorb on the membrane surface, thereby further causing membrane fouling

For solving the serious problem of membrane fouling, many methods have emerged, such as the Chinese patent document "A Method for Alleviating Membrane Fouling in Membrane Bioreactors" (publication number CN 102491505 A, published on June 13, 2012) A method for alleviating membrane fouling in a submerged membrane bioreactor, the method adds a water-soluble iron compound to the feed water before the membrane bioreactor, and the addition amount is 10 to 150 mg / L in terms of ferric ions, It overcomes the disadvantage of adding water-soluble iron compounds to the mixed solution in the prior art, which causes the unsatisfactory effect of actually mitigating membrane fouling, and can significantly reduce membrane fouling. The average growth rate of the membrane pressure difference can be reduced by 8 to 12%. The growth rate of the membrane pressure difference, but the dosage of the agent is large, and the processing cost is high

[0005] The Chinese patent document "A Preparation and Application for Preventing MBR Membrane Fouling" (publication number CN 107899428 A, published on April 13, 2018) discloses a preparation and application for preventing membrane fouling of membrane bioreactors. The preparation includes 50-60% of signal molecule oxidant; 20-30% of filter aid; 10-20% of flocculant; 10-20% of surfactant. Efficiency, relatively low cost, and wide applicability, but the operation process is complicated and the personnel investment is high

The agent added by this method is environmentally friendly and green, and does not increase the burden of subsequent treatment, but there is a problem that the filtration pressure needs to be kept constant, the energy consumption is large, and the treatment cost is high.

[0007] The Chinese patent document "A method for slowing MBR membrane fouling by using Fe3O4 / C" (publication number CN 106698654A, published on May 24, 2017) discloses a method for using Fe 3 o 4 / C slow down membrane-bioreactor membrane fouling method, this method adds a certain amount of Fe in membrane bioreactor 3 o 4 / C, to improve the characteristics of the activated sludge mixture, can effectively improve the membrane fouling problem, prolong the membrane cleaning cycle and the service life of the membrane, its advantage is that Fe 3 o 4 / C is easier to recycle and reuse due to its magnetic properties, which greatly reduces operating costs and effectively avoids secondary pollution in the membrane-bioreactor system. The disadvantage is that it is small in scale and difficult to put into use on a large scale.

[0008] To sum up, the existing technology has complex operation process, high energy consumption, high personnel cost, not only large dosage of chemicals, but also high price, making it difficult to put into large-scale application

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