A zero-discharge treatment system and method for dmf-containing wastewater

Abstract

The invention discloses a zero-emission processing system for wastewater containing dimethyl formamide (DMF) and a method thereof. The system comprises a regulating reservoir, an expanded granular sludge bed (EGSB) reactor, an ammonia stripping tower, a hydrolyzing and acidifying pool, a primary aerobiotic tank, a primary anoxic tank, an external MBR system (a secondary aerobiotic tank and a membrane bioreactor), a primary reserve osmosis (RO) system, a concentrated water reverse osmosis (NRO) system and an evaporator. According to the zero-emission processing system disclosed by the invention, most of the wastewater can be applied to a reuse water system after being treated, and the residual concentrated wastewater is externally conveyed after being evaporated and crystallized; EGSB rector effluent treated by ammonia stripping can achieve 1 to 1 adjustment with system influent; a part of return sludge of the external MBR system enters the hydrolyzing and acidifying tank and the primary anoxic tank, and the rest part of the return sludge is exhausted to a sludge concentrating system and is externally conveyed after being concentrated and filtered; biogas generated by the EGSB reactor can be separated by a steam separator and conveyed to a plant area incinerator to be burnt. The zero-emission processing system disclosed by the invention achieves a zero emission target of high-concentration organic wastewater through technologies of a biochemical method, a membrane method, evaporation and the like.

Description

technical field [0001] The invention belongs to the technical field of water treatment, and belongs to a treatment technology of industrial waste water, in particular to a zero-discharge treatment system and method for waste water containing DMF. Background technique [0002] The treatment of high-concentration refractory organic wastewater is a recognized problem in domestic and foreign sewage treatment circles. High-concentration organic wastewater mainly has the following characteristics: First, the concentration of organic matter is high. The chemical oxygen demand (COD) is generally above 2000mg / L, and some even as high as tens of thousands or even hundreds of thousands of mg / L. Relatively speaking, the biochemical oxygen demand (BOD) is relatively low, and the ratio of BOD to COD in many wastewaters is less than 0.3. Second, the composition is complex. The organic matter in wastewater containing toxic substances is mostly aromatic compounds and heterocyclic compound...

AI Technical Summary

Problems solved by technology

Second, the composition is complex

Third, high chroma and peculiar smell

Fourth, the wastewater may also have strong acid and alkali, high salt content, oiliness, etc.

[0004] At present, there is no relevant research on the zero-discharge technology of high-concentration organic wastewater at home and abroad, which belongs to the relatively advanced technical field.

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