Tannery sewage is one of the important pollution sources of environmental pollution, and it damages the environment and ecology very seriously. Tannery sewage contains a large amount of toxic chromium and other heavy metal elements, BOD, COD and other organic loads are also high, and the concentration of suspended solids is high. Therefore, the process adopts SBR to optimize coagulation. Polyacrylamide is a kind of excellent performance. The polymer coagulant can effectively treat suspended solids in water.
Tannery wastewater treatment polyacrylamide
Tannery wastewater has the characteristics of large sewage volume, high sewage concentration, strong alkalinity, high oxygen consumption, and more suspended solids. Because a variety of chemicals are added in the leather processing process, and the production process also produces a variety of organic and inorganic substances such as acids, alkalis, dyes, sulfides, sugars, oils, proteins, wool fibers, dander, suspended matter, etc. The composition of tanning wastewater is quite complex.
The tannery wastewater has better biochemical properties, and generally can be treated with biochemical methods. However, wastewater often contains sulfide and chromium ions, which can inhibit microorganisms, so full attention should be paid to the role of pretreatment. Therefore, in the treatment of tannery wastewater, a combination of "physical and biochemical" processes are generally used.
Specific application of polyacrylamide in tannery wastewater:
Because polyacrylamide has a variety of active groups, it can have affinity with many substances and adsorb to form hydrogen bonds. It is mainly used to flocculate negatively charged colloids with the functions of turbidity removal, decolorization, adsorption, and adhesion. Play an important role in leather wastewater treatment. Anionic polyacrylamide is generally used for the treatment of tanning wastewater, and cationic polyacrylamide is generally used for tanning wastewater.
In tanning production, due to the different raw skins, different processing techniques, and different finished products, the sewage water quality varies greatly, so the type and dosage of polyacrylamide used will be different. Which polyacrylamide is used? It is still necessary to determine the type and dosage of polyacrylamide through a small experiment and then a big test on the machine to achieve a better water purification effect.
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