Explanation of Sewage Treatment Process Flow for Village Domestic Sewage Treatment Equipment:

This project adopts the biofilm method: anaerobic aerobic (A/0) treatment process. A/O, also known as anaerobic+aerobic biological contact oxidation, is a mature biological treatment process that has the advantages of high volumetric load, fast biodegradation rate, small footprint, low infrastructure investment and operating costs. It can replace the ordinary activated sludge method used in urban sewage treatment and is particularly suitable for the treatment of medium and high concentration industrial wastewater, with low investment, small footprint, and high treatment efficiency.

This process adopts a combination of biological contact oxidation and precipitation, and is mature and reliable. Sludge is precipitated in the equipment, and a portion of the sludge is further oxidized and decomposed due to the action of dissolved oxygen, while another portion is lifted into the sedimentation tank. The system sludge only needs to be regularly pumped in the sedimentation tank. The working program of the main control equipment such as the wind turbine and submersible sewage pump in the system is input into the PLC machine to achieve automatic operation, reduce the workload of operation, and minimize unnecessary human damage.

1. Grille: The wastewater discharged from production is collected by the pipeline system and enters the subsequent treatment system after passing through a coarse grille. Coarse grid is mainly used to intercept large floating objects in sewage, ensuring the normal operation of subsequent treatment structures and effectively reducing treatment loads, providing guarantees for the long-term normal operation of the system.

2. Sewage regulating tank: used to regulate water volume and ensure uniform water quality, so that sewage can enter the subsequent treatment unit relatively evenly. Setting up a pre aeration system in the regulating tank can improve the impact resistance of the entire system, reduce the foul odor of sewage in anaerobic conditions, and reduce the design scale of subsequent treatment units. Submersible sewage pumps are installed in the sewage tank to lift and send sewage to the subsequent treatment units.

The village domestic sewage treatment equipment comes into contact with two major components in the oxidation tank:

(1) Packing: This process uses a new type of three-dimensional elastic packing, a layer dense high-efficiency biochemical packing, which has the advantages of large specific surface area, long service life, easy film formation, and corrosion resistance. At the same time, the filler has a certain degree of stiffness and can cut the bubbles in the sewage at multiple levels, increasing the efficiency of dissolved oxygen. In addition, the fillers are not easily agglomerated, avoiding blockage of the oxidation tank.

(2) Aerator: This process uses a microporous aerator, which has a higher dissolved oxygen transfer rate than other aerators. Its biggest feature is that it does not age, is lightweight, has a long service life, and has advantages such as corrosion resistance and resistance to clogging.

The sewage treatment equipment adopts PLC fully automatic control from inlet to outlet. The specific control content is as follows:

(1) The sewage regulating tank is equipped with a liquid level control device, which operates automatically at high liquid levels; Stop the pump at low liquid level.

(2) The fan operates alternately and provides uninterrupted air supply. Two fans can set the automatic switching interval time as required.

(3) It is recommended to use dual power supply for sewage treatment plants. The main pumps in the processing technology are used alternately, with mutual use and backup, to ensure normal operation.

(4) The start-up, shutdown, and switching of various electrical equipment are automatically linked by a programmable controller according to the program. At the same time, there are automatic and manual transfer switches on the panel of the control cabinet, which can be switched to manual control if necessary.

(5) All types of electrical equipment are equipped with circuit short-circuit and carrier devices, and indicator lights are also installed to display the working status of each electrical equipment.

The electrical control cabinets in the equipment room and operation room should be installed in the ground building. It is recommended to arrange them in the water treatment room next to the main sewage treatment structure to facilitate daily operation management and equipment maintenance.