Requirements for pump selection

In the actual production and operation of domestic sewage treatment plants, water pumps are often unable to operate efficiently, consume more energy, and their control methods are relatively backward. Because of the complex water quality of industrial sewage, the water pumps are required more strictly. The requirements of water pump selection in industrial sewage treatment industry are summarized as follows:

1) to determine the flow Q and head H of the project reasonably, the operating point of the pump should be strictly controlled in the range of high efficiency.

2) the device should be kept high efficiency and low operating cost under the multi-year average lift.

3) under the highest head, the pump can still work normally and efficiently.

4) the pump motor can withstand long term full load operation. In order to maximize the protection of the motor, even in the case of accidental abnormal operation, the cable is damaged and the motor is still underwater, The cable inlet also won't have wet steam to enter the motor and the connection box.

Application of Water pump

The pumps commonly used in sewage treatment plants include centrifugal pumps, screw pumps, diaphragm metering pumps and screw pumps, etc. The following are the characteristics and application occasions of the pumps commonly used in sewage treatment plants:

（1） PW horizontal centrifugal pump

The efficiency of the pump is about 50%, and can transport the wastewater containing fiber or other suspended matter below 80 ℃. The pump is suitable for small sewage treatment plant.

（2） WL vertical sewage pump this pump

The efficiency is about 75%, which can enhance the wastewater with higher temperature and stronger corrosiveness. This pump can also be used to enhance the impurity sewage or mud water, so this pump is more suitable for industrial sewage treatment plant.

（3） ZLB vertical axial flow pump this pump has the characteristics of low lift and large flow, and can be used in large sewage treatment plant.

（4） QZ series submersible axial flow pump

The pump efficiency is about 75%-83%, with low head, large flow rate, simple installation and no pump room, so this pump can be used to enhance the return sludge.

（5） QW series submersible sewage pump this pump has an efficiency of 70% and 85%, and can transport industrial wastewater with pH value below 60 ℃ and pH value 4 ~ 10. This pump can be used to raise impurity sewage slurry water, and this pump is also suitable for industrial sewage treatment plant.

（6） QH series submersible sewage pump this pump has the advantages of high lift and large flow, and is suitable for large sewage treatment plants.

（7） Screw pump has low power consumption. This pump has advantages of low head and high efficiency, so it can be used to raise reflux sludge.

（8） Screw pump with low flow the pump has the characteristics of high lift and can be used to feed or transport sludge with high concentration viscosity.

（9） diaphragm pump plunger pump with low flow rate this pump has the characteristics of high lift, can be used as a dosing or transportation of small flow of sludge.

Selection of water pump for industrial sewage treatment plant

First of all, we should strengthen the optimization of pump selection; secondly, combined with frequency conversion speed regulation, optimization combination and sewage source heat pump and other advanced and efficient energy-saving technology to pump equipment energy-saving technology transformation, so as to achieve the purpose of energy-saving and consumption reduction; finally, The corrosion resistance and acid-alkali resistance of the pump should be considered, because the industrial wastewater has complex water quality, high content of suspended solids, strong acid and alkalinity and so on.