Standard treatment method for high sulfur containing waste alkali liquor in petroleum and coal chemical industry

Abstract

The invention relates to a standard treatment method for high sulfur containing waste alkali liquor in the petroleum and coal chemical industry and belongs to the technical field of sewage treatment.The standard treatment method comprises the steps: firstly, sending waste alkali liquor into an oil separation adjusting tank to remove oil and suspended matters, mixing the waste alkali liquor with aliquid-state desulfurization catalyst, sending into a desulfurization tower, fixing a solid-state desulfurization catalyst in the desulfurization tower, staying the waste alkali liquor in the desulfurization tower for 20 to 25 h, then sending into a pH adjusting tank to adjust a pH to 6 to 10, then sending into an oil separator to remove impurities of emulsified oil, sending into a water distribution adjusting tank, diluting reaction liquid to 10 to 15 times, controlling sewage COD to be below 2000 mg / L, adding N and P compound and an osmotic pressure regulator, then sending into a primary aerating biochemical tank, staying for 40 to 50 h, then sending into a radial sedimentation tank, sending liquid supernatant into an ozone contact oxidation tank, then flowing into a secondary aeratingbiofilter, staying for 5 to 15 h, finally sending into a monitoring tank and draining out after indexes are detected and can reach the standard. The standard treatment method disclosed by the invention has the advantages of lower reaction temperature, low operation cost, stable treatment effect and the like.

Description

technical field [0001] The invention belongs to the technical field of sewage treatment, and in particular relates to a standard-reaching treatment method for high-sulfur waste lye in the petroleum and coal chemical industries. Background technique [0002] Waste lye is a kind of high-concentration refractory organic wastewater produced by petroleum and coal chemical industry. According to the source, it can be divided into refining waste lye, oil refining waste lye, coal-to-olefin waste lye, etc. Waste lye containing inorganic sulfur comes from catalytic cracking, hydrofining, ethylene production and other production links; waste lye containing sodium naphthenate comes from straight-run diesel oil, lubricating oil production and alkali cleaning and refining; waste lye containing organic sulfur mainly comes from Sour crude oil production and condensate oil processing. In the sewage treatment system, in order to save the space occupied by the device and reduce the treatment ...

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Problems solved by technology

The incineration method requires a large investment in equipment, high operating costs, needs to add a combustion aid, and the injector is easy to block; the wet oxidation method requires high temperature and high pressure for reaction conditions, strict requirements on the material of the reactor, and the degradation rate of heterocyclic pollutants is not high. Improper control is easy to coke; advanced chemical oxidation method, the cost of chemicals is high, and the waste residue needs to be further processed

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