Process for reusing tail water in papermaking and pulping

Abstract

The invention relates to a process for reusing tail water in papermaking and pulping. The technology comprises the following specific steps of: (1) feeding wastewater into an equalization basin for premixing; (2) transferring the premixed wastewater into an air flotation system, and reducing COD (Chemical Oxygen Demand) and SS (Suspended Solids); (3) transferring the water treated by the air flotation system into an ozone system, and removing partial COD; (4) adjusting pH (Potential of Hydrogen) of the water treated by the ozone system, transferring partial water into an ultrafiltration system for pre-treating; transferring the other part of water into an electro-adsorption system, and directly feeding the water generated by the electro-adsorption system into an allocation system; (5) transferring the water subjected to ultrafiltration treatment into a reverse osmosis system; (6) transferring the fresh water subjected to reverse osmosis treatment into the allocation system for reusing, and transferring the concentrated water subjected to reverse osmosis treatment into an electroosmosis system for concentrating; and (7) feeding the fresh water subjected to electroosmosis into the allocation system for reusing, and feeding the concentrated water subjected to electroosmosis into an evaporating system for treating. The technology for reusing the tail water in papermaking and pulping realizes the recovery of water resources in the papermaking and pulping industry, and the treated water can be allocated according to the demand on water use of an enterprise, thus meeting the water supply under different requirements for water quality.

Description

technical field

[0001] The invention relates to the treatment of papermaking pulping wastewater, in particular to a papermaking pulping tail water recycling process, which realizes the recovery of water resources in the papermaking pulping industry, and the treated water can be deployed according to the water demand of enterprises, and can be Meet the various water standards of enterprises. Background technique

[0002] Papermaking pulping wastewater has complex components, and is a difficult-to-treat organic wastewater with large water volume, high chroma, large suspended solids content, high concentration of organic matter, and complex components. The papermaking industry has a large amount of wastewater discharge. With the improvement of papermaking wastewater discharge standards year by year, conventional sewage treatment equipment and a single process can no longer meet the needs of enterprises, and the maturity of membrane technology, electrodialysis and other technolo...

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