Stone processing wastewater
DATE：2017-10-19 / READ：
The stone processing industry not only consumes a large amount of water resources, but also causes serious pollution to the water body. Although this kind of stone powder and sludge is a physical change of substance, but discharged into rivers, ponds and reservoirs, the precipitation will be tight sealing bottom, eventually causing serious pollution of water, however, after reasonable treatment and reuse, the protection of the environment and save water fee and sewage charges relatively substantial, improve enterprise the competitiveness.
Stone processing wastewater mainly contains powder (SiO2, CaO component and CaCO3), a small amount of fine diamond abrasive grain, and wash the mud and sand etc.. Compared with mill wastewater, the quality of the two kinds of wastewater from the saw and cutting edge machine is more similar, and the particles in the sewage are more coarse and contain small amount of organic coolant (mainly saponification, Swire oil, etc.). Through investigation and water quality analysis, the characteristic pollutants of wastewater are suspended solids (SS). The particles in sewage are suspended and colloidal, and the dispersion is high.
At present, domestic sewage treatment methods include: physical treatment, chemical treatment and biological treatment method of three kinds of sewage contain pollutants removal, recycling, or transformed into harmless substances, purified water. The main characteristic of sewage in stone processing industry is the high content of suspended solids. Most of the existing stone manufacturers generally use precipitation method, specifically with natural precipitation method, coagulation precipitation method to remove pollutants. The choice of pool type is mostly advection or vertical flow. The general stone waste water treatment process is shown in the picture.
Stone processing wastewater collected through the sewers in the plant, into the regulation pool, by homogenizing, adding polymeric aluminium chloride and polyacrylamide as coagulant and coagulant after reaction in the reaction tank is generated by sedimentation tank alum, precipitation, most of the suspended solids sink to the bottom of the pool, into the supernatant the clear water tank, through the water reuse system into the production workshop to be reused or discharged.
AUTHOR：ATZ Environmental Protection Technology