Polyaluminum chloride in the field of sewage treatment is very important to use the effect of Polyaluminum chloride as a relatively broad wastewater treatment chemicals, an inorganic polymer coagulants, due to the bridging effect of hydroxyl ions and multivalent High molecular weight, high charge inorganic polymers produced by the polymerization of anions are used in general oil fields. The pollutants that can rapidly process drilling wastewater include drill cuttings, petroleum addictives, clay stabilizers, etchants, Preservatives, bactericides, lubricants, formation affinity agents, defoamers, etc., heavy metals contained in drilling wastewater. Other types of sewage mainly include percolation water from sludge storage sites, washes of washing equipment, surface runoff rainwater, domestic sewage and polluted water caused by accidental leakage and discharge. Due to the variety of oilfields, stratum differences and different drilling processes, the oilfield wastewater treatment stations have not only great differences in water quality but also great changes in the quality of oilfield wastewater, which makes it difficult for oilfield wastewater treatment. Polyaluminum chloride Notes for use and dosage 1, according to the different conditions of raw water, before use can be done on a small test to get the best dose. For ease of calculation, small test solution configuration by weight (W / W), usually 2 ~ 5% with good. If equipped with 3% solution: said polyaluminum chloride solid 3g, into a clean 200ml measuring cylinder, add about 50ml of water, to be dissolved and diluted with water to 100ml scale, shake well. 2, the production of aluminum chloride solid by solid: water = 1: 9 to 1:15 by weight (liquid products using 1: 2 to 1: 5) can be mixed and dissolved. Alumina content of less than 1% of the solution is easy to hydrolysis, will reduce the use of effect, the concentration is too high not easy to vote evenly. 3, dosing by small test to get the best dosage dosing, and pay attention to observe and adjust in operation. See the settling pond alum less, Yuzhu large, the dosage is too small; see see the settling pond alum and up, Yuzhuo high, the dosage is too large, should be properly adjusted. In recent years, polyaluminum chloride has become an important agent in the field of sewage treatment, mainly because of strong coagulation ability, rapid demulsification, rapid settling velocity, small volume of flocs, and effective coagulation under alkaline and neutral conditions Agent, is the direction of water treatment agent developers. Polyaluminum chloride, polyaluminum chloride, polyacrylamide as the focus of research on the treatment of oilfield sewage using pharmaceutical agents.