First of all, it is easy to cause blockage in the water conveyance system. In most power plants, coal-bearing wastewater is mainly collected in the sump between the coal bunkers. After being re-washed by the drainage pipe, the coal yard wastewater will be introduced into the primary sedimentation tank. In this process, the coal-bearing waste water flows through the coal bunker room, drainage room, coal bunker room and other workshops, and is not treated in a specialized place, but is scattered and transported by pressure pipes. Therefore, it is very easy to cause the problem of blocking, especially in the process of water transmission, the coal falling from the main plant trestle and transportation station is easy to be mixed, and the impurity content of the water delivery particles is greatly increased. Once it passes through the treatment devices such as the pump and water delivery pipe network, it is easy to cause blocking. In addition, due to the complexity of the pipe network and the long operation interval of the lift pump in the power plant, the negative impact time of pipe network blockage is long.

Second, it will generate additional costs for the power plant. Sedimentation method is the preferred method for many power plants to treat coal-bearing wastewater. This method requires that the wastewater be treated by equipment such as grab crane after settling in the sump for a period of time. However, due to long-term sedimentation, most of the coal cinders become sludge and dirt, and the static friction between them is small, which makes it difficult to achieve one-time cleaning. In addition, due to the stickiness of the sludge sediment, it is easy to rub with the coal water lift pump, resulting in the wear of the water pump, which increases the working pressure of the water pump maintenance.

Finally, the effect of BOD treatment is poor. According to the treatment method of coal-bearing wastewater in the power plant, physical separation such as sedimentation, degradation and sludge discharge are the main treatment methods. However, in the actual operation of the power plant, most of the plant waste water from the transfer station, coal bunker room and other plants flows into the coal-bearing waste water settling room along with the sewage pipe, which greatly increases the overall BOD content of the waste water. However, due to the lack of chemical degradation and biological treatment in the traditional treatment technology, the factory wastewater still contains too much organic matter, which is easy to cause microbial reproduction after being discharged into the water, resulting in a series of problems.