Advanced treatment system and process of chemical wastewater

Abstract

The invention discloses a deep chemical wastewater treatment system which comprises a Fenton fluidized bed device, a flocculation and sedimentation device and a biological aerated filter device which are sequentially communicated with one another, wherein the Fenton fluidized bed device comprises a reaction tank body, a clapboard, multiple water distributors, granular catalyst packing, an effluent weir plate, a first water outlet pipe, a water inlet pipe, a return pipe, a circulating pump and a first dosing device; the clapboard divides the reaction tank body into a lower premixing chamber and an upper reaction chamber separator; the multiple water distributors are arranged on the clapboard; the effluent weir plate is arranged on the upper part of the reaction chamber; and the circulating pump and the first dosing device are arranged on the return pipe. According to analysis of the various existing wastewater treatment technologies, targeted research is performed by combining the problems such as complicated chemical wastewater matter structure and high treatment difficulty, and the Fenton fluidized bed technology and the biological aerated filter technology are ingeniously combined according to the economy principle in actual production, so that the advantages of the two technologies are synergistically matched with one another, and the problem that the chemical wastewater treatment does not reach the standard and the problem that the conventional equipment is high in operating cost are solved.

Description

technical field [0001] The invention relates to the technical field of advanced treatment of chemical wastewater, in particular to a system and process for advanced treatment of chemical wastewater. Background technique [0002] The pollution hazards caused by chemical wastewater to the environment and the prevention and control measures that should be taken depend on the characteristics of chemical wastewater, that is, the type, nature and concentration of pollutants. The water quality characteristics of chemical wastewater not only vary according to the type of wastewater, but also vary with time and place. The main characteristics of chemical wastewater are: large discharge volume; complex composition; serious pollution. The water quality of different chemical wastewater varies greatly. Taking chemical oxygen demand as an example, the lower one is between 250 and 3500mg / L, and the higher one is often tens of thousands of milligrams per liter, or even hundreds of thousan...

AI Technical Summary

Problems solved by technology

[0005] However, although the COD of the effluent from the secondary sedimentation tank after the front-end treatment is high, the biodegradability of the wastewater is poor and contains toxic and harmful substances. If the pure biological treatment technology is used, the treatment effect is extremely poor and cannot meet the standard; if the advanced oxidation technology is used, Such as Fenton (Fenton), ozone oxidation and other treatment technologies have reached the standard, because the macromolecules, rings, and long-chain organic substances in the wastewater are oxidized into small molecules and are not easy to be further oxidized into CO 2 and H 2 O, it needs to consume a lot of chemicals and cause very high operating costs, which is not feasible in actual production

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