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With the increase in operating costs and labor costs of sewage treatment equipment, the cost of community sewage treatment also increased, however, the sewage treatment plant operators are still constantly optimize the process to improve the reliability of sewage treatment technology and equipment, Meet the higher economic requirements. The availability and operating costs of the sewage pump are of vital importance to the design level. As an important equipment for the sewage purification process, the cost of the whole life cycle (including investment, operating costs and maintenance costs) is fully taken into account in the initial structural design.
1. need to pay attention to the key points
In general, the sewage pump and the amount of sewage and the amount of sewage to adapt to the composition (including impeller type). The structure of the sewage pump should not be easy to block the place, durable and reliable, colleagues should pay attention to the minimum flow rate of pressure pipes.
Solid matter in the sewage is easily deposited and agglomerated in the pipeline, especially in the vertical transport process, easily lead to solid material is not easy to chase away from the pump pit, or control valve due to deposition of dirt and stuck. Therefore, in order to ensure the reliability of the work of the equipment, need to ensure a certain minimum self-cleaning flow rate. Grundfos recommends that the minimum self-cleaning flow rate of the horizontal pipe is 0.7 m / s and the self-cleaning flow rate of the vertical pipe is 1 m / s. As a result, the flow of many small sewage pumps is often not determined by the actual flow rate, but by the self-cleaning flow of the sewage pump. Due to working noise and economic factors, the maximum flow rate of the sewage pump shall not exceed 2.3 m / s.
Also note that the number of times the sewage pump switch, the number of start-up of the sewage pump should be consistent with the performance of the motor (as little as possible). For ease of maintenance, the installation location of the sewage pump should be very open (choose dry or wet equipment). Finally, should check for the possibility of flammable and explosive media? Or the possibility of producing biogas? If so, you must use a flameproof safety type sewage pump.
2. Installation of dry or wet equipment
In principle, make decisions between dry installation and wet installation: dry-mounted sewage pumps can be used either vertically or horizontally. Dry installation is a bit easy to disassemble and assembly, easy maintenance, but the need to build pump room, there must be capital budget.
As a technical alternative to the economy, the traditional submersible pump has entered the field of sewage purification technology, wet install the sewage pump is the biggest advantage: the sewage pump installed under the water, no need to build pump room.
Impeller is the core of the pump - the energy required to deliver the liquid medium, mainly single suction impeller, free flow impeller and pipe impeller three.
In the free-flow impeller sewage pump, the sewage is not directly in contact with the impeller. Based on the principle of hydraulic coupling, the sewage circulates around the pump casing and delivers long fibers or viscous solid matter together. But the cost of this pump is low, of course, the choice of the impeller itself is a high efficiency and low gap between the possibility of a compromise. (Public number: pump housekeeper)
On the issue of energy efficiency, there is always a need for some compromise options: if the working hours of the sewage pumps are relatively short (for example, the number of sewage pumps in the spillway pumping station is limited per year), the energy utilization of the sewage pump There is little relationship between the level of high and low, and for other often run or used for many years the sewage pump, pay attention to the economy and the efficiency of the motor is particularly important.