Coking wastewater deep treatment and reuse process and equipment thereof

Abstract

The invention discloses a coking wastewater deep treatment and reuse process and equipment thereof, belonging to the technical field of environmental protection, and the main steps are as follows: dosing a coagulant in biochemical treatment water, then leading the biochemical treatment water to enter into a sedimentation tank, discharging sludge from a sludge hopper, leading treated water to enter into a three-dimensional electrode reactor, leading the outlet water after electro-oxidation treatment to enter into a biological filter tank, and leading the water after the treatment of the biological filter tank to enter into a follow-up ultrafiltration treatment; the ultrafiltration outlet water has two selections, one is to reuse the outlet water as the process water directly, the other one is to continuously pass through a reverse osmosis membrane system for treatment; and the coagulation and sedimentation tank, the process equipment of the three-dimensional electrode reactor, the biological filter tank, the ultrafiltration system and the reverse osmosis desalination system are adopted during the treatment process, thereby achieving the purposes of removing residual refractory organic matters, suspended impurities and salt in the waste water, reusing the outlet water, simultaneously leading the content of the organic matters in the reverse osmosis concentrated water not to exceed the national environmental protection standard, also reusing the concentrated water in occasions with less stringent requirements on the water quality and achieving the purpose of zero emission of the wastewater.

Description

technical field [0001] The present invention relates to a method for advanced treatment of organic wastewater, in particular to a process for advanced treatment and reuse of coking wastewater. More particularly, the present invention also provides process equipment used in the process of the present invention. Background technique [0002] Coking wastewater is wastewater produced during high-temperature coal dry distillation, gas purification and chemical product refining. The main sources are: first, residual ammonia water, which is produced during coal dry distillation and gas cooling, and is the main source of coking wastewater; It is the wastewater produced in the process of gas purification, such as gas final cooling water and crude benzene separation water, etc.; the third is the wastewater produced in the refining process of tar and crude benzene and other occasions. Coking wastewater mainly contains phenol, cyanide, ammonia nitrogen, sulfide It is a kind of wastewate...

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Problems solved by technology

[0005] The Chinese patent number is CN101280461, a treatment system and method for realizing the reuse of coking wastewater. Coagulation sedimentation, photocatalytic ozone, and activated carbon filtration technologies are used to realize the reuse of coking wastewater, but this technology is purely physical and photochemical. Degradation and mineralization of organic matter, there is a problem of high operating costs

[0006] The Chinese patent number is CN100999366. The coking wastewater reuse treatment method adopts the process of chlorine dioxide oxidation, precipitation method to remove ammonia nitrogen, filtration method to remove ammonia nitrogen and reverse osmosis desalination, and the reuse of wastewater is also purely physical and chemical. To remove organic matter and ammonia nitrogen, the operating cost is also high

[0008] Moreover, the above patents on three-dimensional electrode reactors all tend to introduce the principle, and the equipment also tends to be on the laboratory scale, failing to provide an equipment model that can be applied to the engineering scale

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