Method for treating cationic dye wastewater through modified fall-off biofilm of biological filter

A cationic dye and biological filter technology, which is applied in the field of modified biological filter shedding biofilm to treat cationic dye wastewater, can solve the problems of large intermediate products and sludge sedimentation, complex process and low removal rate, and achieve ideal adsorption performance. , The effect of high dye removal rate and high adsorption capacity

Inactive Publication Date: 2015-02-18
ZHEJIANG NORMAL UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The purpose of the present invention is to provide a solution for the disadvantages of large investment, high cost, complex process, low removal rate, easy to produce toxic intermediate products and difficult sludge settlement in the existing technology for treating dye wastewater. A method for treating cationic dye wastewater by using the biofilm shed from a biofilter as a raw material and using it as a biosorbent after activation and modification

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] Measure 5 liters of septic tank sewage into the pool, add 750mg of whole milk powder, 4000mg of flour, KH 2 PO 4 120mg and Na 2 SO 4 1400mg, stir evenly, adjust the pH value of the nutrient-rich sewage mixture to 7.0; collect the biofilm that comes off from the biofilter, wash it 3 times with clear water, weigh 2Kg of biofilm (moisture content is calculated as 95% on average) and 15g of bentonite Add it into the nutrient-rich sewage mixture, aerate for 6 hours, then take out the biofilm and rinse it twice with clean water; put the biofilm into a closed container, first pass 15mg / L ozone for 25 minutes, and then inactivate it with steam at 120°C for 12 minutes; The pH value of the cationic dye wastewater was adjusted to 7.2, and the biofilm was added to the cationic dye wastewater, adsorbed for 49 minutes under constant aeration, and the water was precipitated.

Embodiment 2

[0027] Measure 5 liters of septic tank sewage into the pool, add 500mg of whole milk powder, 2500mg of flour, KH 2 PO 4 75mg and Na 2 SO 4 2500mg, stir evenly, adjust the pH value of the nutrient-rich sewage mixture to 6.5; collect the biofilm that comes off from the biofilter, rinse it twice with clear water, weigh 2Kg of biofilm (moisture content is calculated as 95% on average) and 10g of bentonite Add it into the nutrient-rich sewage mixture, aerate for 5 hours, then take out the biofilm and wash it twice with clean water; put the biofilm in a closed container, first pass 10mg / L ozone for 20min, and then inactivate it with steam at 120°C for 10min; The pH value of the cationic dye wastewater was adjusted to 7.0, and the biofilm was added to the cationic dye wastewater, and was adsorbed under continuous aeration for 60 minutes, and the water was precipitated.

Embodiment 3

[0029] Measure 5 liters of septic tank sewage into the pool, add 1000mg of whole milk powder, 5000mg of flour, KH 2 PO 4 125mg and Na 2 SO 4 1150mg, stir evenly, adjust the pH value of the nutrient-rich sewage mixture to 8.5; collect the biofilm that comes off from the biofilter, wash it 3 times with clear water, weigh 2Kg of biofilm (moisture content is calculated by 95% on average) and 20g of bentonite Add it to the nutrient-rich sewage mixture, aerate for 8 hours, then take out the biofilm and rinse it with clean water 3 times; put the biofilm into a closed container, first pass 20mg / L ozone for 30min, and then inactivate it with steam at 120°C for 15min; The pH value of the cationic dye wastewater was adjusted to 7.5, and the biofilm was added to the cationic dye wastewater, and was adsorbed under constant aeration for 45 minutes, and the water was precipitated.

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Abstract

The invention provides a method for treating cationic dye wastewater through a modified fall-off biofilm of a biological filter. Compared with the existing dye wastewater treatment technology, the method has the advantages of high sludge proportion, high sedimentation velocity, high adaptability, low dye wastewater treatment cost, high dye absorbing and removal rate, etc. The method for treating the cationic dye wastewater through the modified fall-off biofilm of the biological filter comprises the following steps of: (1) uniformly mixing sewage of a septic tank, whole milk powder, flour, KH2PO4 and Na2SO4 to obtain an eutrophic sewage mixing solution; (2) collecting the biofilm fallen off from the biological filter, adding bentonite, and aerating in the eutrophic sewage mixing solution; (3) putting the aerated and flushed biofilm into a closed vessel, charging ozone, and then inactivating with high-temperature steam to obtain an activated and modified biofilm; and (4) adding the activated and modified biofilm to the cationic dye wastewater, aerating and absorbing cation from the dye wastewater, and then depositing and draining the water after the absorption is finished.

Description

technical field [0001] The invention relates to the technical field of environmental protection, in particular to a method for treating cationic dye wastewater with exfoliated biofilm in a modified biological filter. Background technique [0002] In recent years, my country's textile dye industry has developed rapidly, and its annual wastewater production is about 7 billion tons. Due to the increasing variety of dyes, some of the pollutants have the characteristics of complex chemical structure, high stability, refractory degradation, and toxicity, and are developing in the direction of anti-photolysis, anti-oxidation, and anti-biodegradation, making dye production wastewater Handling becomes more difficult. Therefore, the treatment of dye production wastewater has always been a difficult point and a hot spot in industrial wastewater treatment. [0003] At present, the treatment methods for some refractory dye wastewater include physical methods such as membrane separation...

Claims

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Application Information

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Patent Type & AuthorityPatents(China)
IPC IPC(8): B01J20/24C02F1/28C02F103/30
Inventor李小忠徐强强刘俊华郭婷梁刚锋
OwnerZHEJIANG NORMAL UNIVERSITY