Treatment of waste alkali after alkaline washing of refined oil products

Hehe, taken from the internet: Technology for treating wastewater with high concentrations of alkaline residues is being promoted. Oil refineries and chemical plants in China that use petroleum distillates as raw materials rely on five specialized equipment and process technologies such as cooling systems and exhaust gas purification systems as well as recirculating cooling towers. The process of alkaline refining of oils generates large amounts of wastewater containing highly polluting substances; two patents have been obtained for the treatment of such waste alkaline solutions. Sexual wastewater: the emissions of pollutants such as COD, sulfides, and phenols from this type of wastewater account for a significant portion of the total pollutant emissions. Industrial test results show that the use of this technology can reduce sulfur emissions in waste alkaline solutions by 20% to 30%. Such wastewater represents a major source of offensive odors in refineries and petrochemical plants. The oil refinery alkali slag and wastewater treatment technology jointly developed by the Fushun Research Institute of Petrochemicals of Sinopec Corporation and the Shanghai Gaoqiao Branch can effectively oxidize and treat high-concentration wastewater such as waste alkaline solutions from catalytic cracking gasoline production and liquefied petroleum gas production. This technology, which possesses independent intellectual property rights, has reached an international advanced level. It has been applied in more than 10 petrochemical enterprises in cities such as Shanghai, Daqing, and Qingdao, achieving excellent results. This technology employs a mild wet oxidation deodorization process combined with an intermittent activated sludge method, addressing various engineering challenges such as the design of the mild wet oxidation reactor, the cooling of the gas-liquid mixture after deodorization, and the structure of the SBR bioreactor. A closed-loop wet oxidation reactor was successfully developed; the separation of the gas-liquid mixture after deodorization was achieved, and the mass concentration was reduced from 8 s/L to below 0.5 ms/L. The phenol concentration was lowered from 10 L to below 2 ms/L, while the COD concentration was reduced from 150 g/L to below 500 mg/L, meeting the water quality standards for wastewater entering oil refining wastewater treatment plants ； It can completely eliminate the pollution of air and water bodies caused by sodium sulfide and organic sulfides in refinery waste alkaline solutions, removing over 90% of pollutants such as COD and phenols from these solutions. This achievement provides a suitable set of technologies for the treatment of waste alkali solutions from refineries, significantly reducing the load on wastewater treatment plants and ensuring the proper operation of existing wastewater treatment systems as well as compliance with discharge standards. This technology features a simple process flow, small equipment footprint, low investment and operating costs, high level of automation, and easy operation, making it suitable as a replacement for imported equipment.