Advanced treatment method for industrial park wastewater

Abstract

The invention discloses a treatment method for industrial park wastewater. The treatment method sequentially comprises the following steps: pretreatment on the wastewater, hydrolytic acidification variable biochemical treatment, flocculation and sedimentation, advanced oxidation, secondary precipitation, biological aerated filter, oxidation pond and the like, wherein a hydrolytic acidification variable biochemical treatment system controls anoxic and aerobic environments through water quality change within a running cycle; the anti-shock water loading capability of the system is increased; nutrient substances such as nitrogen and phosphorus are removed when carbon-source organic matters are removed; ultraviolet light and ozone are combined by a high-level oxidation system; the pollution removal rate of a reaction system is greatly improved; and the residual SS, COD, BOD, nitrate, phosphorus and the like are removed by the biological aerated filter. Compared with the prior art, the pollutant removal capacity is obviously improved; and the effluent can reach the maximum allowable emission concentration level standard A (petrochemical industry, seeing table 4 in GB8978-1996) of the second pollutants in the integrated wastewater discharge standard (GB8978-1996).

Description

technical field [0001] The invention relates to a method for treating wastewater in industrial parks, in particular to treating wastewater in petrochemical industrial parks, and belongs to the field of water treatment in environmental protection. Background technique [0002] At present, in addition to chemical industry, electroplating and other professional industrial parks and other professional industrial parks with conditions that need to build separate centralized wastewater treatment plants, there are three main modes of wastewater treatment in industrial parks: one is that the enterprises are pretreated and incorporated into the municipal pipe network for urban wastewater treatment The second is that the enterprises build their own wastewater treatment facilities to treat the discharge up to the standard, which is mostly adopted at present; the third is that the wastewater treatment plants built in the park are discharged into the industrial park wastewater treatment p...

AI Technical Summary

Problems solved by technology

[0003] (1) There are many chemical production facilities in petrochemical and chemical parks, the discharge of wastewater is irregular, and the water quality and quantity fluctuate greatly

[0004] (2) The wastewater quality of petrochemical and chemical industry parks is complex, often containing polycyclic aromatic hydrocarbon compounds, aromatic amine compounds, heterocyclic compounds and other refractory organic substances, and the biodegradability of wastewater is poor after pretreatment

[0005] (3) If the effluent needs to meet the relatively strict primary standard, the discharge standard cannot be met by relying solely on secondary treatment

[0006] According to the above characteristics, it is difficult to meet the discharge standards by relying on simple biochemical or physical chemical and traditional biochemical and physical chemical combined processes. The wastewater that does not meet the standards is discharged irregularly, and even illegal discharge occurs, which has a serious impact on the surrounding environment, especially petrochemical, Refractory substances in chemical industry parks have brought serious harm to the local environment and the health of residents, so there is an urgent need for a treatment method suitable for petrochemical industrial park wastewater

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