Method for deep processing and recycling oil refining wastewater

Abstract

The invention relates to a method for deep processing and recycling oil refining wastewater. A technical scheme of the invention includes: adding 15-25 mg / L inorganic / organic composite coagulant into biochemically-treated oil refining wastewater for coagulating, and removing colloid and residual macromolecular organics in the oil refining wastewater; pumping the coagulated oil refining wastewater into an ozone catalytic oxidation column, wherein a ceramsite catalyst using manganese nitrate, titanium dioxide and copper nitrate as active ingredients is disposed in the ozone catalytic oxidation column; introducing ozone gas, keeping ozone concentration in a liquid phase under 25-35 mg / L, and reacting for 12-15 min; finally, pumping the oil refining wastewater subjected to ozone catalytic oxidation into a polyvinylidene fluoride tubular-membrane ultrafiltration membrane assembly, and using effluent of the polyvinylidene fluoride tubular-membrane ultrafiltration membrane assembly as supplementary water of recirculating cooling wat4er of a refinery for refuse.

Description

technical field [0001] The invention belongs to the technical field of advanced treatment of oil refinery wastewater. Specifically, it relates to a method for advanced treatment and reuse of oil refinery wastewater. Background technique [0002] With the country's further emphasis on low-carbon economy and energy conservation and emission reduction, the requirements for the discharge of oil refining wastewater have been raised, and oil refining companies are facing severe environmental pressure. There are dozens of large and medium-sized refineries in my country, and most of the refinery wastewater treatment adopts the treatment process of "oil separation-air flotation-A / O biochemical". Complex follow-up processes such as oxidation can meet the newly promulgated national discharge standards. Therefore, the advanced wastewater treatment process with short development process, simple process and low investment has attracted more and more attention from technicians in the indus...

AI Technical Summary

Problems solved by technology

[0004] The biochemical refinery wastewater is first subjected to biological contact oxidation, then biological aeration treatment, and then filtered through a multi-media filter device, and the filtered wastewater is finally ultrafiltered. This method has complex processes, long hydraulic retention time and high operating costs.

[0005] "A Reuse Treatment Method for Oil Refining Wastewater" (CN103771656B), the method is to sequentially degrease and remove suspended solids treatment, sequence batch activated sludge treatment and forward osmosis membrane bioreactor treatment for oil refinery wastewater, through deoiling and suspended solids treatment to remove petroleum and suspended solids, remove most of COD and ammonia nitrogen through SBR treatment, remove residual COD through OMBR, and intercept suspended solids and inorganic salts. This method treats water quality better, but there are complex treatment processes and Disadvantages such as high operating costs

[0006] "A method for advanced treatment of oil refinery wastewater" (CN102276053B). This method uses the refinery wastewater after the secondary biological treatment of the refinery as the raw water for advanced treatment, and injects the acetic acid solution and the raw water into the biological aerated filter at the same time to control the acetic acid. Using the co-substrate principle to further remove residual organic matter in refinery wastewater, this method needs to continuously add acetic acid, and the wastewater after adding acetic acid needs to be neutralized by adding alkali because of its acidity, so the treatment cost is high