Dynamic membrane automatic water flow-out solid-liquid separation method applicable to domestic sewage treatment

Abstract

The invention provides a dynamic membrane automatic water flow-out solid-liquid separation method applicable to domestic sewage treatment. The method includes: adding powder particles with fine water permeable performance into activated sludge to form biological intensified powder mixed liquid to structurally improve the activated sludge; combining with the dynamic membrane separation technique to greatly improve the filtering capacity and water permeability of dynamic membrane filter cakes; performing solid-liquid separation of discharged water by allowing a dynamic membrane component to be driven by a water head having lower fixed gravity action and formed by liquid level waterhead between the upper liquid level of the immersed dynamic membrane component in a reaction device and a wateroutlet, stably controlling the unit area membrane filter flux of the dynamic membrane component to be more than 20-60L / m2h and the continuous operating time to be longer than 120h without action of external power; and allowing the dynamic membrane to completely shed with the air backwashing time being 1min-2min and the air inlet pressure being 9.8-49kPa. The dynamic membrane component does not need to be chemically cleaned regularly, and control and operation of the method can be automatically controlled in the whole process. The dynamic membrane solid-liquid separation technique can realize automatic water flowing out under differential pressure of low-liquid-level waterhead, energy consumption is greatly reduced, operation process is simplified, and discharged water is high in quality.

Description

technical field [0001] This invention relates to a method for solid-liquid separation of dynamic membrane self-flowing water suitable for domestic sewage treatment, which can realize dynamic membrane self-flowing water under the drive of gravity, without the need for power equipment, and saves energy consumption. It belongs to the new type of membrane solid-liquid in the field of domestic sewage treatment. Separation technology. Background technique [0002] The new membrane bioreactor formed by the combination of membrane separation and bioreactor is considered to be the most promising sewage treatment and bioreactor in the 21st century because of its reliable effluent quality, convenient operation, compact structure, and small footprint. One of the recycling technologies. Submerged membrane bioreactor combined membrane technology and bioreactor technology is a new bright spot in efficient sewage treatment system. However, there are not many examples of the application of...

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Problems solved by technology

[0006] The purpose of the present invention is to overcome the shortage of high power consumption of membrane bioreactor in urban sewage treatment, and develop a dynamic membrane self-flowing water solid-liquid separation method suitable for domestic sewage treatment. Water-permeable powder particles (such as powder sintered diatomite, powdered activated carbon, etc.) form a bio-enhanced powder mixture to improve the structure of activated sludge; combined with dynamic membrane separation technology, the filtration and permeability of dynamic membrane mud cake are greatly improved Capability; it can realize the solid-liquid separation and water discharge of the dynamic membrane module (flat or tubular type) driven by the fixed gravity effect water head formed by the liquid level difference between the upper liquid level of the submerged dynamic membrane module in the reaction device and the water outlet, No need for external power, easy operation and low energy consumption

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