Knowledge of sewage treatment: sewage treatment how to choose the pumps

The power consumption of the pump in the sewage treatment plant accounts for about 35% of the total power consumption of the plant. Pumps as one of the sewage treatment equipment, power consumption and so high. Therefore, the pump can run efficiently and normally become a direct impact on the sewage treatment plant sewage treatment efficiency and operating costs of important factors.　Pump selection requirements The actual production of domestic sewage treatment plant operation, the pump is often unable to operate efficiently, energy consumption is large, and its control is relatively backward. Due to the complexity of industrial wastewater quality, the pump requirements are more stringent, summing up the industrial wastewater treatment industry to optimize the pump selection requirements are as follows: 1) Reasonably determine the flow rate of the project Q and the head H value, the pump should be strictly controlled in the operation of the working point within the scope of the high-efficiency zone.　2)Should make the device under the average head for many years to maintain high efficiency and low utilization cost.　3) In the verification of the highest head, the pump can still ensure that the normal and efficient work.　4) pump motor can withstand long-term full load operation. In order to maximize the protection of the motor, even if the cable is damaged and the motor is still underwater in case of accidental abnormal operation, no moisture will enter the motor and the junction box from the cable inlet.　Application of water pumps Commonly used water pumps in sewage treatment plants are centrifugal pumps, screw pumps, diaphragm metering pumps and screw pumps, etc. The following are the characteristics of several commonly used water pumps in sewage treatment plants and the use of occasions: (1) PW-type horizontal centrifugal pumps the efficiency of this pump is about 50%, can be transported at 80 ℃ below the wastewater containing fibers or other suspended solids, the pump is more suitable for use in small-scale sewage treatment plants.　(2)WL Vertical Sewage Pump The efficiency of this pump is about 75%, which can lift wastewater with higher temperature and corrosiveness, and this pump can also be used to lift impurity wastewater or slurry water, so this pump is more suitable for industrial wastewater treatment plant.　(3)ZLB type vertical axial flow pump This pump is characterized by low head and large flow, and can be used in large sewage treatment plants.　(4)QZ series submersible axial flow pump The efficiency of this pump is about 75% - 83%, with low head, large flow, simple installation and can not be set up pump room features, so this pump can be used to lift the reflux sludge.　(5)QW Series Submersible Sewage PumpThe efficiency of this pump is 70% - 85%, it can transport industrial wastewater below 60℃, pH value is 4 - 10, this pump can be used to lift impurity sewage slurry water, this pump is also more suitable for industrial wastewater treatment plant. This pump is also more suitable for industrial sewage treatment plant.　(6)QH Series Submersible Sewage PumpThis pump has the advantages of high head and large flow rate, and is suitable for large-scale sewage treatment plants.　(7)Screw pump with low power consumptionThis pump has the advantage of low head, high efficiency, and can be used as lifting return sludge.　(8)Screw pump with low flow rateThis pump is characterized by high head and can be used as dosing or conveying sludge with large concentration and viscosity.　(9) Diaphragm pump piston pump with low flow rate of this pump has the characteristics of high head, can be used as dosing or conveying small flow rate of sludge.　Industrial wastewater treatment plant for the selection of pumps First of all, to strengthen the pump optimization selection; Secondly, combined with frequency control, optimization of combinations and sewage source heat pumps and other advanced and efficient energy-saving technology for energy-saving technical transformation of pumps and equipment to achieve energy saving and consumption reduction; Finally, we also need to consider the pump's corrosion resistance and acid and alkali resistance, because the complexity of the industrial wastewater water quality, with a high content of suspended solids, acidic and alkaline strong The water quality of industrial wastewater is complex, with a high content of suspended solids, acid and alkali characteristics.