Process for reusing tail water in papermaking and pulping

A technology of tail water and process, which is applied in the process of wastewater treatment, water/sewage multi-stage treatment, water/sludge/sewage treatment, etc., to achieve the effect of solving the problem of large discharge

Active Publication Date: 2013-10-09
NANJING UNIV OF TECH +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The process adopts membrane treatment process, and the water recovery rate can only reach about 70%.

Method used

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  • Process for reusing tail water in papermaking and pulping
  • Process for reusing tail water in papermaking and pulping

Examples

Experimental program
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Effect test

Embodiment 1

[0027] The sewage of a papermaking enterprise is used for industrial circulating cooling water after treatment. The process flow chart is as follows figure 1 shown. After using a complete mixing homogeneous pool to mix mechanically, the COD Cr is 112mg / L, TDS is 1840mg / L, SS is 45mg / L, after being treated by aeration flotation machine, COD Cr Reduced to 68mg / L, SS reduced to 5mg / L, COD after ozone system treatment Cr Reduced to 56mg / L, the wastewater enters the pH adjustment tank, and the pH is adjusted to 6.5. After the wastewater with a volume fraction of 45% enters the electrosorption system, the TDS of fresh water decreases to 731mg / L, and the conductivity removal rate is 40%. The other water enters the ultrafiltration System treatment, in which ultrafiltration adopts hollow fiber membrane with an average pore size of 10nm, after treatment COD Cr The reverse osmosis system uses 4 stages of reverse osmosis, of which 1~3 stages use low-pressure reverse osmosis membranes, ...

Embodiment 2

[0030] A large pulp and paper company conducts advanced treatment of biochemical tail water and reuses it as industrial circulating cooling water. The process flow is as follows figure 1 . The quality of biochemical tail water is 150mg / L for COD, 1184mg / L for TDS, and 56mg / L for SS. Cr Reduced to 87mg / L, SS reduced to 5mg / L, COD after ozone system treatment Cr Reduced to 66mg / L, the wastewater enters the pH adjustment tank, and the pH is adjusted to 8. After the wastewater with a volume fraction of 75% enters the electrosorption system, the TDS of fresh water decreases to 568mg / L, and the conductivity removal rate is 70%. The other wastewater enters the ultrafiltration Systematic treatment, the ultrafiltration system uses a tubular ceramic membrane with an average pore size of 50nm, and the treated wastewater COD Cr Reduced to 61mg / L, the reverse osmosis system uses 6 stages of reverse osmosis, of which 1 to 5 stages use low-pressure reverse osmosis membranes, and the sixth ...

Embodiment 3

[0033] The process flow of advanced treatment of sewage in a pulping enterprise is as follows figure 2 shown. After mechanically stirring and mixing in a homogeneous tank with uniform distribution, the COD Cr is 130mg / L, TDS is 3210mg / L, SS is 48mg / L, after being treated by air flotation machine, COD Cr Reduced to 81mg / L, SS reduced to 5mg / L, COD after ozone system treatment Cr Reduced to 63mg / L, the wastewater enters the pH adjustment tank, and adjusts the pH to 10. After the wastewater with a volume fraction of 12% enters the electrosorption system, the TDS of fresh water decreases to 1898mg / L, and the conductivity removal rate is 50%. The other water enters the ultrafiltration System treatment, the ultrafiltration system uses a hollow fiber organic membrane with an average pore size of 100nm, and the COD after treatment Cr Reduced to 59mg / L, the reverse osmosis system uses 2 stages of reverse osmosis, of which the first stage uses a low-pressure reverse osmosis membrane...

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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...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F9/10C02F1/44C02F1/469C02F103/28
Inventor 杨刚李卫星李辉邢卫红
Owner NANJING UNIV OF TECH
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