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Advanced treatment and recycling device and method of papermaking wastewater

A technology for papermaking wastewater and advanced treatment, which is applied in processing wastewater treatment, water/sewage multi-stage treatment, water/sludge/sewage treatment, etc. The effect of paper discharge, simple operation

Inactive Publication Date: 2011-05-25
ZHEJIANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

After being treated by this method, the indicators of the effluent COD<70mg / L, BOD5<20mg / L, SS<30mg / L can only be used for boiler cooling water, and it is difficult to apply to the production of paper industry

Method used

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  • Advanced treatment and recycling device and method of papermaking wastewater

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] After the secondary treatment, the papermaking wastewater enters the first sump for water quality regulation. The inflow and outflow of the first sump is 96m 3 / d, the water quality is as follows: pH is 6.78, COD Cr 200mg / L, BOD 44mg / L, turbidity 10NTU, chromaticity 300 times, conductivity 3000μs / cm 2 .

[0032] Wastewater from the first sump is 96m 3 The flow rate of / d enters the biological aerated filter, and the residence time is 4.9h, and most of the soluble organic pollutants in the wastewater are degraded by microorganisms. After treatment, the effluent water quality is as follows: pH is 7.13, COD Cr 80mg / L, BOD 15mg / L, turbidity 4NTU, chromaticity 210 times, conductivity 3000μs / cm 2 , the effluent enters the second sump for water quality regulation.

[0033] Wastewater from the second sump is 96m 3 The flow rate of / d enters the sand filter tank and the carbon filter tank successively, and the chroma and COD of the wastewater are removed by the adsorption...

Embodiment 2

[0038] After the secondary treatment, the papermaking wastewater enters the first sump for water quality regulation. The inflow flow of the first sump is 72m 3 / d, the water quality is as follows: pH is 7.78, COD Cr 200mg / L, BOD 44mg / L, turbidity 10NTU, chromaticity 300 times, conductivity 3000μs / cm 2 .

[0039] The waste water of the first sump is 72m 3The flow rate of / d enters the biological aerated filter, the residence time is 3.6h, and 5g of diammonium hydrogen phosphate is added per ton of wastewater as a nitrogen and phosphorus source, and most of the soluble organic pollutants in the wastewater are degraded by microorganisms. After treatment, the effluent water quality is as follows: pH is 7.53, COD Cr 80mg / L, BOD 11mg / L, turbidity 4NTU, chromaticity 190 times, conductivity 3000μs / cm 2 . The effluent enters the second sump for water quality regulation.

[0040] Wastewater from the second sump is 72m 3 The flow rate of / d enters the sand filter tank and the car...

Embodiment 3

[0045] After the secondary treatment, the papermaking wastewater enters the first sump for water quality regulation. The influent flow rate of the first sump is 96m 3 / d, the water quality is as follows: pH is 7.48, COD Cr 150mg / L, BOD 35mg / L, turbidity 11NTU, chromaticity 270 times, conductivity 2500μs / cm 2 .

[0046] Wastewater from the first sump is 96m 3 The flow rate of / d enters the biological aerated filter tank, the residence time is 4.9h, and 2g of urea is added as a nitrogen source and 3g of diammonium hydrogen phosphate as a phosphorus source per ton of wastewater, and most of the soluble organic pollutants in the wastewater are degraded by microorganisms. After treatment, the effluent water quality is as follows: pH is 7.33, COD Cr 75mg / L, BOD 13mg / L, turbidity 4NTU, color 163 times, conductivity 3000μs / cm 2 , the effluent enters the second sump for water quality regulation. .

[0047] Wastewater from the second sump is 96m 3 The flow rate of / d enters the ...

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Abstract

The invention discloses an advanced treatment and recycling device and method of papermaking wastewater. The device comprises a first water-collecting pool, an aeration biological filter, a second water-collecting pool, a sand filter tank, a carbon filter tank, a third water-collecting pool, an ultrafiltration system and a reverse osmosis system which are connected in turn. The wastewater treatment comprises the following steps: papermaking wastewater enters the first water-collecting pool after secondary treatment; the wastewater in the first water-collecting pool enters the aeration biological filter to remove partial organic pollutants in wastewater; the wastewater treated by the aeration biological filter enters the second water-collecting pool; the wastewater in the wastewater passes through the sand filter tank and the carbon filter tank to remove the chroma of wastewater and partial organic pollutants; the wastewater treated by the sand filter tank and the carbon filter tank enters the third water-collecting pool; the wastewater of the third water-collecting pool enters the ultrafiltration system to remove partial colloidal material in wastewater; the wastewater treated by the ultrafiltration system enters the reverse osmosis system to remove partial salt in wastewater; and the clean water from the reverse osmosis system enters a clean-water pool.

Description

technical field [0001] The invention relates to a device and method for advanced treatment and reuse of papermaking wastewater, belonging to the technical field of environmental protection. Background technique [0002] The paper industry is a large discharge of industrial wastewater in my country. According to statistics, the total amount of wastewater discharged annually reaches 4.9 billion tons, accounting for 17% of the total discharge of industrial wastewater in the country. 32%. At present, the paper industry has formed a mature technology for primary physical and chemical treatment and secondary biochemical treatment of wastewater, and the treated wastewater can meet the discharge standards. With the gradual strictness of my country's environmental protection laws and the continuous enhancement of national environmental protection awareness, advanced wastewater treatment and reuse has become the only way for sustainable industrial development. [0003] At present, th...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F9/14C02F1/44C02F103/28
Inventor 史惠祥次新波张高川万先凯
Owner ZHEJIANG UNIV
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