How to control temperature in MBBR sewage treatment plant

MBBR sewage treatment plant can achieve temperature control in the following ways:

1. Using heating or cooling equipment
Heat exchanger: Install a heat exchanger outside the reactor to adjust the sewage temperature by circulating hot water or cold water. When the water temperature is too low, hot water is introduced to increase the water temperature; when the water temperature is too high, cold water is introduced to cool it down. Heat exchangers can be of various types such as tubular and plate types. The appropriate type should be selected according to the scale and actual needs of the treatment plant.

Steam heating or cooling system: For large MBBR sewage treatment plants, steam heating or cooling systems can be used. Steam heating can pass steam into the heating coil of the reactor in cold seasons to increase the sewage temperature. The cooling system generates a low-temperature medium through the refrigeration unit during high temperatures in summer, which is circulated into the reactor to reduce the water temperature.

2. Optimize reactor design
Insulation measures: Insulate the reactor and wrap the reactor shell with insulation materials such as rock wool and polyurethane foam to reduce heat loss to the surrounding environment. This helps maintain the stability of the temperature in the reactor and reduces the impact of changes in the external environment temperature on the treatment process.

Reasonable design of water flow path: By optimizing the water flow path in the reactor, the sewage is evenly distributed in the reactor to avoid local over-high or over-low temperatures. For example, multiple water inlet points or guide plates are used to promote full contact between sewage and biofilm, which is also conducive to uniform heat transfer.

3. Utilize the heat of sewage itself
Waste heat recovery: If the sewage itself contains a certain amount of heat, waste heat recovery technology can be used. For example, the heat of the treated effluent is transferred to the inlet water through a heat exchanger to increase the inlet water temperature, reduce dependence on external heating equipment, and achieve effective use of energy.

4. Monitoring and control
Temperature sensor: Install multiple temperature sensors in the reactor to monitor the sewage temperature in real-time. The sensor transmits the temperature signal to the control system so that the operator can understand the temperature changes in a timely manner.

Automatic control: Based on the feedback from the temperature sensor, the control system automatically adjusts the operating parameters of the heating or cooling equipment to keep the temperature in the reactor within the appropriate range for microbial growth (generally 15 - 35℃).

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