Comprehensive processing method for furfural production wastewater

Abstract

The invention provides a furfural waste water comprehensive treatment method which aims at the defects of the existing furfural production waste water processing method. The furfural production waste water is fed into a pre-processing unit; then the pre-processed waste water enters an electric dialyzator; the diluted phase effluent of the electric dialyzator enters a biochemical treatment device after meeting the biochemical treatment requirement, and reaches the standard for discharge after the biochemical treatment; and the concentrated phase effluent of the electric dialyzator can reach certain concentration by electrodialysis concentration so as to extract a distillation unit to recycle acetic acid, thus being capable of obtaining the industrial first-grade acetic acid. The concentrated phase effluent of the electric dialyzator can also be free from being concentrated so as to be repeatedly used. The furfural waste water comprehensive treatment method has the advantages that the whole processing technique is characterized not only by large waste water processing amount, strong impact resistance and stable processed water quality, but also by recycling the important chemical industry product, namely, acetic acid, simultaneously when the waste water is processed, thus fully showing the organic combination of electrodialytic technique, biodegradation technique, and extractive distillation technique, and being an effective and economic comprehensive treatment method.

Description

technical field [0001] The invention belongs to a method for treating industrial organic waste water, and in particular provides a comprehensive treatment method for furfural production waste water. Background technique [0002] Furfural is an important organic chemical raw material, which is mainly used in furfuryl alcohol processing, petrochemical, pharmaceutical and other industries. Its main raw materials are corncobs and other pesticide residues. Furfural production is a project that obtains greater economic benefits with relatively small economic investment, and is of great significance to the revitalization of regional economy and the promotion of social development. However, the pollution of furfural production wastewater has become a bottleneck restricting the development of this industry. [0003] The furfural wastewater mainly comes from the wastewater below the tower, which contains a large amount of acetic acid. Every ton of furfural produced produces 30m of wa...

AI Technical Summary

Problems solved by technology

Alkali-added neutralization process is simple, but its wastewater discharge does not meet the national discharge standards, and the COD removal rate is not high; direct recovery method can recover acetic acid, but the solvent consumption is large; electrodialysis method can recover acetic acid, but the efficiency of electrodialysis is low, The energy consumption is high, and the treated wastewater cannot be reused or discharged up to standard; the anaerobic filter has a large impact load resistance capacity and a high COD removal rate, but the investment is large and the requirements are high; the recyclable part of the phase transfer method is 30- 40% acetic acid, but the process is complex, it may bring a lot of by-products and secondary pollution, economically unreasonable

[0005] In recent years, CN200410011386.2, CN200610017170.6, and CN200710010166 proposed the method of neutralization, double-effect evaporation, activated carbon adsorption, centrifugal filtration, and recovery of acetic acid by preparing calcium acetate. This method is simple, stable and reliable, and easy to maintain and manage, but can High consumption, accumulation of recycled products, and secondary pollution

CN200610050837.2 discloses a reverse osmosis membrane treatment method for furfural wastewater. This method also has the problem of recovering acetic acid by preparing calcium acetate, and serious membrane pollution leads to increased costs.

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