How MBBR wastewater treatment plants operate automatically

MBBR (moving bed biofilm reactor) wastewater treatment plants achieve automated operation mainly through the following key aspects:
Sensor monitoring system
Water quality parameter monitoring: Various water quality sensors are installed at the inlet, outlet and reaction tank of the MBBR plant. For example, dissolved oxygen (DO) sensors are used to monitor the dissolved oxygen content in water in real time, which is essential for the metabolic activities of aerobic microorganisms. By monitoring the DO value, the automation system can control the operation of the aeration equipment according to the set optimal dissolved oxygen range (such as 2-4mg/L). Chemical oxygen demand (COD) sensors and ammonia nitrogen sensors can detect the concentration of organic matter and ammonia nitrogen in sewage to determine the degree of sewage treatment and provide a basis for adjusting parameters such as hydraulic retention time (HRT).

Flow and liquid level monitoring: Flow sensors are installed in the inlet and outlet pipes to measure the flow of sewage. Liquid level sensors are installed in the reaction tank to monitor water level changes. These data are very important for controlling the inlet and outlet speed of sewage, preventing sewage overflow and ensuring the stable operation of the plant. The automation system can automatically adjust the operating frequency of the water pump according to the flow and liquid level information to ensure that the hydraulic conditions in the device are in the best state.

Automation control unit
Equipment control logic programming: The automation control unit is the core of the entire automation operation. It operates various equipment in the MBBR device based on pre-written control logic. For example, when the inlet flow rate suddenly increases, the control unit can automatically increase the power of the aeration equipment and the speed of the stirring equipment according to the data of the flow sensor to maintain appropriate hydraulic conditions and oxygen supply. At the same time, according to the feedback information from the water quality sensor, such as the COD concentration is too high, the control unit can extend the residence time of the sewage in the device by adjusting the opening of the inlet and outlet valves.

Remote monitoring and operation: Modern MBBR automation systems usually have remote monitoring functions. Operators can view the real-time operation data of the device, including water quality parameters, equipment status, etc., at the control center or remote location through the host computer software or mobile phone application. And some important parameters can be set and the equipment can be operated remotely in an emergency, such as remotely shutting down or adjusting the operation of a certain device when an abnormal situation is found.

Automation of equipment operation
Aeration equipment automation: The aeration system can be automatically adjusted according to the data of the dissolved oxygen sensor. When the dissolved oxygen is lower than the set value, the automation system will automatically increase the frequency of the aeration fan or open more aeration heads to increase the dissolved oxygen content in the water; conversely, when the dissolved oxygen is too high, the aeration intensity will be reduced to avoid energy waste and adverse effects on microorganisms.

Automation of inlet and outlet equipment: The operation of the inlet pump and outlet valve can be automatically controlled according to the data of the liquid level and flow sensor. The inlet pump automatically starts and stops or adjusts the speed according to the liquid level and inlet flow in the reaction tank to ensure the stability of the water level in the device. The outlet valve automatically controls the outlet flow according to the treated water quality and liquid level to ensure that the sewage has enough treatment time in the device.

Automation of mixing equipment: The mixing equipment (if any) can be automatically adjusted according to the flow rate, water quality and growth of microorganisms in the sewage. For example, when the concentration of pollutants in the sewage is high or the attachment of microorganisms needs to be improved, the automation system can increase the operating time and intensity of the mixing equipment to promote full contact and material exchange between microorganisms and sewage.

Fault diagnosis and early warning system
Equipment fault detection: The automation system can monitor the operating status of each device in real time, such as the current, temperature, vibration of the motor, etc. When signs of equipment failure are detected, such as abnormal current of the aeration fan or abnormal vibration of the water pump, the system will immediately sound an alarm and automatically switch to backup equipment or take emergency shutdown measures if possible to avoid serious impact on the sewage treatment process.

Water quality abnormality warning: Through continuous monitoring of water quality parameters, the system can set water quality abnormality warning values. For example, when the COD or ammonia nitrogen concentration of the effluent exceeds a certain proportion of the discharge standard, the system will issue a water quality abnormality warning. This helps to promptly detect problems in the sewage treatment process, such as microbial poisoning, equipment failure, etc., and remind operators to take corresponding measures to adjust and repair.
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