English 
French 
Spanish 
Turkish 
Russian Application of Filter Press in Power Plant Coal Slime Wastewater Treatment
During the operation of modern power plants, coal storage, and transportation systems will produce a large amount of coal sludge wastewater. This type of wastewater generally has the characteristics of high suspended matter content, high turbidity, and strong viscosity. If it is not effectively treated, it will not only affect the environment but also cause resource waste. In order to achieve the goals of resource recovery, standard discharge, and efficient volume reduction, the use of efficient solid-liquid separation technology has become the core means. The following is the application of a filter press in the power plant’s coal slime wastewater treatment.
Reasons for Treating Coal Slime Wastewater
Coal slime wastewater mainly comes from the coal yard spray system, belt washing, transfer point cleaning, and other links. The water contains a large amount of fine coal powder, mud, and organic impurities. The particles are small and highly dispersed, making them difficult to treat.
Treatment objectives
Recover coal slime resources and realize resource reuse;
Reduce the concentration of suspended solids to ensure that the discharge meets the standards.
The filtrate can be reused or stably discharged in compliance with the standards.
Reduce the moisture content of the mud cake to facilitate transportation and disposal.
Coal Slime Wastewater Treatment Process
Pretreatment Stage
In order to improve the solid-liquid separation efficiency, the coal slime wastewater needs to be flocculated. Commonly used flocculants include polyacrylamide (PAM) and composite polymer flocculants. Under the action of mechanical stirring, fine particles form large particle flocs through polymer chain bridging, which is conducive to subsequent filter pressing.
The dosing system accurately adds chemicals to ensure sufficient flocculation reaction.
The reaction tank or stirring tank promotes full mixing of chemicals and wastewater, forming stable flocs and reducing the risk of filter cloth clogging.
Filter Press Dehydration Stage
The flocculated mud-water mixture enters the filter press system for high-pressure dehydration. Depending on the scale of the power plant and the processing load, a diaphragm filter press or a chamber filter press is often used as the main equipment.
The diaphragm filter press has a secondary extrusion function, and the moisture content of the mud cake is low, which can be reduced to 30%-60%.
The chamber filter press has a simple structure and stable operation, which is suitable for small and medium-sized systems.
The automatic filter cloth washing system is optional to ensure continuous operation.
The Role of Filter Press in Power Plant Wastewater Treatment
High solid-liquid separation efficiency
Power plant wastewater usually contains a large amount of solid particles, ash, gypsum, etc. The filter press can achieve fast and efficient solid-liquid separation so that the solid forms a filter cake and the liquid meets the discharge or reuse standards.
Helps to reduce sludge volume
The sludge discharged from the filter press has a low moisture content, which helps to reduce the volume and volume of sludge and reduce the subsequent sludge disposal costs, such as transportation, incineration, or landfill.
Improve the water resource reuse rate
The treated clear liquid can be reused in the cooling system, flushing system, or other non-production water areas, improving the recycling efficiency of water resources and reducing the overall water cost.
Conclusion
The efficient treatment of coal slime wastewater not only solves the problem of discharge but also realizes resource recovery and optimization of operating costs. Through the combined process of pretreatment flocculation + high-efficiency filter press dehydration, the power plant can achieve the triple goals of filtrate discharge, filter cake transportation, and resource utilization, meet the increasingly stringent environmental protection standards, and improve the level of green operation.
