Industry solutions for water treatment

 A typical urban sewage treatment process mainly includes mechanical treatment, biochemical treatment, sludge treatment and other sections. The system composed of mechanical treatment and biochemical treatment is a secondary treatment system, and its BOD5 and SS removal rate can reach 90% to 98%. The treatment effect between primary and secondary treatment is generally called enhanced primary treatment, primary and a half treatment or incomplete secondary treatment. There are two main categories: high-load biological treatment and chemical treatment. The BOD5 removal rate can be Reaching 45% to 75%. Secondary treatment systems with biological phosphorus and denitrification functions are often called deep secondary treatment. In order to remove specific substances, the treatment system set up after the secondary treatment is a tertiary treatment, such as chemical phosphorus removal, flocculation filtration, activated carbon adsorption, etc.

 

The oxidation ditch process is a common sewage treatment process. Oxidation ditch, also known as oxidation ditch, is so named because its structure is a closed annular ditch. It is a variation of the activated sludge process. Because sewage and activated sludge continuously circulate in the aeration channels, some people call it "circulating aeration tank" or "terminal-less aeration tank". The oxidation ditch has a long hydraulic retention time and low organic load. It is essentially a delayed aeration system.

Our factory may be able to fully meet the requirements of the oxidation ditch sewage treatment process, providing a highly reliable, low-cost, and more optimized control solution. process control strategy

 

grille control

 

The grid control adopts two modes: time control and liquid level difference control. Under normal circumstances, the grille operates according to the preset time interval and duration. When the liquid level difference before and after the grille is greater than the set value, the grille decontamination machine starts to work continuously until the liquid level difference is small enough to meet the requirements. Afterwards, resume normal grille decontamination machine operation. The screen slag conveying press operates in conjunction with the screen.

 

Upgrade pump room

 

Automatically control the speed of the variable frequency speed regulating pump and the start/stop of the water pump according to the liquid level in the water collection tank. According to the lowest liquid level in the water collection tank, the pump automatically stops to realize dry running protection of the pump. The number of starts and total operating hours of each pump are balanced. The initial setting gives each pump equal running time. The control system monitors the operation process of the pump, and if the pump fails, it will alarm and automatically put in the backup pump.

 

Grit chamber and sand-water separator

 

The sand transport pump and other motors of the grit chamber and the sand-water separator form a self-contained system and are controlled by the attached control box.

oxidation ditch

 

The PLC adjusts the operation and speed of the turntable according to the measured value of dissolved oxygen in each channel, and controls the operation of the propeller scraper bridge.

 

Backflow and residual sludge pump room

 

The start, stop and running time of the return sludge pump are feedback controlled by PLC based on the mixed liquid concentration detected in the biological pool.

Substation

 

PLC does not participate in the control of the substation and communicates with the power station automation monitoring system through RS485 or other interfaces.

 

Sludge thickening tank

 

The sludge thickening tank mixer operates continuously and is started and stopped manually by the on-site electrical control box or controlled by PLC.

 

Sludge dewatering machine room

 

The sludge dehydrator and its auxiliary machines are controlled by the sludge dehydrator control box. When the sludge dehydrator is working, its sludge pump, dosing device, dosing pump, etc. operate in conjunction.

 

Blower room

 

The blower control system uses the gas signal as the main control signal and the oxidation ditch dissolved oxygen signal as the auxiliary signal. It automatically controls the opening of the regulating valve according to the actual load to achieve the purpose of controlling the quality of the outlet water. The number of starts for each blower is balanced against the total operating hours.

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