During the processing of marble and other stone materials, the wastewater generated contains a large amount of stone powder and coolant. If these wastewater are directly discharged, it will not only cause waste of water resources, but also seriously pollute the environment. To solve this problem, a certain stone processing enterprise adopts chemical precipitation method, combined with polyaluminum chloride (PAC) and polyacrylamide (PAM), combined with filter press equipment, to achieve effective treatment and recycling of sewage, while creating additional economic benefits.
1、 Characteristics and treatment difficulties of sewage
Marble processing wastewater has the characteristics of high suspended solids concentration and complex composition. The fine particles of stone powder are difficult to settle naturally, and the coolant contains various chemicals such as surfactants, rust inhibitors, etc., which increase the difficulty of wastewater treatment. If not effectively treated, suspended solids in sewage will clog pipelines, and chemicals in coolant will pollute soil and water bodies.
2、 Filter press processing flow
The enterprise has installed high-efficiency filter presses in the sewage treatment system. Firstly, add polyaluminum chloride and polyacrylamide into the dosing buckets provided with the filter press, and dissolve and stir them in a certain proportion. The dissolved drug is precisely controlled by a dosing pump to deliver to the mixing tank of the filter press. In the mixing tank, the chemicals are thoroughly mixed with the sewage, and coagulation and flocculation reactions occur rapidly. Subsequently, the mixed liquid enters the filter chamber of the filter press, and under pressure, the water is discharged through the filter cloth, while the sediment is trapped in the filter chamber. After a period of pressure filtration, a mud cake with low moisture content is formed, achieving efficient separation of solid and liquid.
In summary, the use of chemical precipitation method, combined with polyaluminum chloride and polyacrylamide, and combined with filter press equipment to treat marble processing wastewater is an efficient, economical, and environmentally friendly solution with good promotion value.
3、 Selection of filter press model
Post time: May-17-2025