A Introduction about Application of Polyaluminum Chloride in Oilfield Wastewater Treatment

Oily sewage is mainly pollutants produced during the mining process of petrochemical enterprises. If the oily sludge is not treated properly and discharged directly, it will not only directly affect the soil and groundwater resources, but also be a huge waste of our scarce oil resources. If certain chemical technology is used for wastewater with harmful substances and high oil content, a considerable amount of dirty oil in oily sludge can be recovered, and the treated sewage sludge can reach the discharge standard to prevent pollution.

Polyaluminum chloride has become an important agent in oilfield sewage treatment in recent years, mainly due to its strong coagulation performance, fast demulsification, fast sedimentation speed, small floc volume, and a new type of coagulation that is equally effective under alkaline and neutral conditions. Agents are the direction of efforts of developers of water treatment agents.

In addition, the desulfurization effect of polyaluminum chloride in oilfield sewage treatment is obvious. A large number of sulfur ions in oilfield sewage not only cause great harm to the surrounding environment, but also induce localized corrosion and stress corrosion cracking of metal equipment. Polyaluminum chloride is used for the desulfurization effect of oilfield sewage treatment. Polyaluminum chloride has a wide pH range, low cost and good safety. The electrochemical method was used to oxidize sulfur ions into sulfur element, and then polyaluminum chloride was used as a flocculant to desulfurize oilfield wastewater.

The oil field wastewater treatment room must be degreased first, and other treatments are carried out. The degreasing process is inclined tube degreasing (light oil floats up, scraper scrapes off, heavy oil sinks, and the pipeline is discharged), and the air flotation machine removes emulsified oil. Pay attention to the effect of the air flotation machine on removing emulsified oil. The demulsification experiment should be done for the oil in the water, and then the content of the main agents such as polyaluminum chloride should be selected.

Studies have found that because polyaluminum chloride has a long molecular chain, it can bridge the colloidal particles formed by coagulation to form large and tough flocs, thereby improving the performance of the flocs.?Combining?polyaluminum chloride and polyacrylamide can improve the treatment effect