Method and apparatus for treating oil refining sewerage

Abstract

The invention relates to a treatment method and a device for refinery sewage. The refinery sewage is sent into an electrolytic catalysis oxidation reactor which is provided with an anode, a cathode and solid catalyst particles, wherein, the lower part of the reactor is provided with an oxygenation aeration device, the solid catalyst particles are filled between the anode and the cathode, and the solid catalyst particles adopts particle activated carbon loaded with metals having catalytic and oxidation function. The effluent of the electrolytic catalysis oxidation can be further treated by adopting an activated sludge process. The method is used for treating high-concentration salt-containing mixed wastewater such as the draining water of a refinery electrical desalting unit, the alkali washing waste alkali liquid of oils, liquefied petroleum gas and dry gas, and cutting water in an oils tank farm, and the like, the wastewater after treatment satisfies the requirement of direct discharging, thus alleviating impact on a wastewater treatment plant. The method put forward by the invention has the advantages that high-concentration wastewater can reach disposable treatment standard and does not need any dilution biochemical treatment, treatment effluent is not polluted secondarily by metal ions, and investment and running cost are lower, and the like.

Description

technical field [0001] The invention relates to a treatment method for oil refinery sewage and a device used in the method, in particular to a standard-reaching treatment method and device for high-concentration salt-containing sewage in oil refinery. Background technique [0002] At present, oil refinery sewage is mainly treated by centralized mixing, that is, oily sewage discharged from various production units, sulfur-containing sewage, purified water after stripping pretreatment, and production or domestic water are mixed and then passed through the oil separation-flotation-biochemical combination process Discharge after standard treatment. However, with the deteriorating properties of crude oil processed by refining and chemical companies and the increasingly stringent requirements for wastewater reuse due to water shortages, this centralized and mixed treatment method and process for wastewater has increasingly exposed major problems. First of all, the proportion of m...

AI Technical Summary

Problems solved by technology

After the three types of wastewater are mixed, they finally show the comprehensive characteristics of salinity, high emulsification, high concentration, difficult biodegradation, and strong odor. It is difficult to achieve effective oil removal, biooxidation, or physical and chemical treatment technologies by conventional oil removal, biological oxidation, and physical and chemical treatment. Emission targets such as deodorization and COD removal

[0005] Based on the above analysis, using various current methods to treat high-concentration salt-containing mixed wastewater such as drainage from electric desalination units in oil refineries, alkali washing waste lye from oil products and liquefied petroleum gas or dry gas, and cut water from oil tank farms all exist or do not exist. Suitable, or insufficient treatment effect, or large investment and high operating costs, or easy to produce secondary pollution of metal ions and many other problems