Anionic polyacrylamide is a water-soluble high molecular polymer. It is mainly used for flocculation and sedimentation of various industrial wastewaters, precipitation and clarification treatment, such as steel plant wastewater, electroplating plant wastewater, metallurgical wastewater, coal washing wastewater, sewage treatment, sludge dewatering, etc. .
If it is flocculation and sedimentation of sewage, it is chosen to use anionic anionic polyacrylamide or nonionic anionic polyacrylamide, and some need to be combined with inorganic flocculant polyaluminum chloride or polyaluminum sulfate according to the actual process. When choosing anionic polyacrylamide, pay attention to the range of pH values ??for anionic polyacrylamide. The anion is suitable for a pH greater than 7, if the pH is less than 7, then use a non-ionic type. Sometimes cations are used, depending on the situation.
Mud water is a suspension liquid containing a certain amount of fine mud particles in water. Generally, the pretreated industrial wastewater contains many suspended particles, high concentration, positive charge of particles, neutral or alkaline water of water, and anionic polyacrylamide for treating steel plant wastewater, electroplating wastewater, metallurgical wastewater. , sewage treatment such as coal washing wastewater, the best results.
Anionic polyacrylamide for flocculation and sedimentation of various industrial wastewaters
Application in the recovery of lost starch distiller's grains in starch plants and alcohol plants: Many starch plants now contain a lot of starch in their wastewater. Now, anionic polyacrylamide is added to flocculate the starch particles, and then the precipitate is pressed by a filter press. It is filtered into a cake and can be used as feed. The alcohol in the alcohol factory can also be dehydrated by anionic polyacrylamide and recovered by pressure filtration.
Coal chemical discharge wastewater is mainly high-concentration gas washing wastewater, which contains a large amount of toxic and harmful substances such as phenol, cyanide, oil and ammonia nitrogen. The organic pollutants contained in the wastewater include phenols, polycyclic aromatic compounds and heterocyclic compounds containing nitrogen, oxygen and sulfur. It is a typical industrial wastewater containing refractory organic compounds. The easily degradable organic matter in wastewater is mainly phenolic compounds and benzene compounds; pyrrole, naphthalene, furan and carbazole are degradable organic substances.
Different amounts of sewage anionic polyacrylamide flocculant may be used differently. In addition, in the experiment, various problems should be considered. In short, the selection of anionic polyacrylamide is very important.
