Integrated sewage treatment device and method

Abstract

The invention discloses an integrated sewage treatment device and method and belongs to the technical field of sewage treatment. The sewage treatment process comprises the following steps: ammonia nitrogen is converted into nitrate nitrogen through a nitration reaction in an aerobic environment, the nitrate nitrogen is converted into nitrogen through a denitrification reaction in an anoxic environment, and denitrification is realized; and meanwhile, activated sludge is left in the system by utilizing the membrane separation performance of the MBR, so that the yield of residual sludge is reduced, and meanwhile, the high-concentration microbial biomass of the system is kept. Periodic in-situ membrane cleaning is performed through reciprocating motion of a membrane module device, and sludge adsorbed on the surfaces of membrane filaments is desorbed through mutual collision and friction between the membrane filaments and water, so that the use frequency and concentration of chemical liquid medicine are reduced, the damage of the chemical liquid medicine to the membrane filament state is reduced, the service life of the membrane module is prolonged, and the operation and maintenance cost of equipment is reduced; and meanwhile, the resistance of water flowing through the membrane is reduced, the permeability of micropores on the surface of membrane filaments is maintained, the MBR running flux is improved, and the running stability of equipment is enhanced.

Description

technical field [0001] The invention relates to an integrated sewage treatment device and method, and belongs to the technical field of sewage treatment. Background technique [0002] MBR sewage treatment has the characteristics of high solid-liquid separation efficiency, high activated sludge concentration, and low residual sludge output. At the same time, it realizes complete separation of hydraulic retention time (HRT) and sludge age (SRT), making operation control more flexible and stable. , easy to realize automatic control, convenient operation and management. However, in the process of MBR sewage treatment, suspended matter such as particles, colloidal particles or solute macromolecules in the sewage will inevitably be adsorbed and deposited on the membrane surface or in the membrane pores to cause blockage of the MBR, thereby affecting the degradation and filtration efficiency of the MBR, that is, the membrane The pollution problem seriously restricts the stable ope...

AI Technical Summary

Problems solved by technology

However, the existing MBR process is mainly applied to sewage treatment in the form of engineering, which belongs to the site-fixed building, that is, each engineering equipment is independently set up separately, the process flow is long, the construction scale is large, immovable, and the process is not easy to control. Some small-scale sewage treatment and reclaimed water reuse, especially those projects with scattered sewage sources, unstable water quality and quantity, short working cycle, and lack of professional operation and maintenance personnel are not suitable, which will cause a very large consumption of manpower and financial resources

[0006] Disadvantages of the existing technology: (1) The integrated treatment equipment only scales the process of the sewage treatment plant, and does not consider the particularities of scattered sewage pollution sources in villages and towns, unstable water quality and quantity, etc., and the traditional process of complex operation process, difficult maintenance, and high energy consumption Sewage treatment technology cannot be effectively applied; (2) The existing MBR process is mainly applied to sewage treatment in the form of engineering. Treatment engineering is not applicable; (3) The MBR process often uses continuous gas aeration to control membrane fouling. , leading to poor removal of total nitrogen in the system, which affects the water quality of MBR water. On the one hand, the hair entanglement at the root of the membrane filaments caused by aeration affects the service life of MBR; (4) When the MBR membrane is seriously polluted, chemical cleaning is often used However, on the one hand, this method increases the cost of equipment maintenance, especially in remote villages and towns where there is a lack of professionals to maintain the membrane modules, which may cause the MBR to fail to work normally. The degree of damage to the membrane unit itself is immeasurable, and it may affect the stable operation of the MBR in serious cases; (5) MBR without aeration uses ultrasonic waves, electromagnetic vibration or mechanical vibration to control membrane fouling, but the movement form and process of the MBR There is still room for improvement in terms of design and operational stability

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