Combined process for refined cotton black liquid treatment

A combined process and refined cotton technology, applied in the field of water treatment, can solve the problems of high treatment operating costs, serious pollution, difficult process control, etc., and achieve the effect of solving difficult treatment

Inactive Publication Date: 2014-02-12
QINGDAO UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] However, there are some problems in the production of refined cotton due to the traditional high-temperature and high-alkali cooking and chlorine-containing bleaching processes: First, the pollution is very serious, and the waste water mainly comes from cooking black liquor and bleaching white liquor
Second, the pulping yield is low, the color is deep, the degradation is serious, and it is difficult to produce products with high whiteness and high polymerization degree
Among them, the black liquor combustion causticization method, condensed air flotation method, wet oxidation alkali recovery method, and membrane separation method have large investment scale, difficult process control, and relatively high treatment and operation costs.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] Take 1000mL of refined cotton black liquor, the measured COD is 44580mg / L, and the conductivity is 2.66×10 4 μS / cm. with 30%H 2 SO 4 Adjust the pH to 3.05, heat the water until the water temperature is 30±1°C, let it stand for 60 minutes, and centrifuge. The measured COD of the supernatant is 8040mg / L;

[0033] After acid analysis, the supernatant enters the electrosorption device, the control voltage is 1.5V, the electrode distance is 1.5cm, the electrode material is activated carbon fiber, the hydraulic retention time is 30min, the COD of the effluent is 2780mg / L, and the conductivity is reduced to 1.6× 10 4 μS / cm;

[0034] The electro-adsorption effluent enters the anaerobic reactor equipped with anaerobic granular sludge, the temperature is controlled at 35±1°C, the dissolved oxygen is 0-0.3mg / L, the hydraulic retention time is 24h, and the effluent COD is 1290mg / L;

[0035] The anaerobic effluent enters the aerobic reactor, the temperature is controlled at 25±...

Embodiment 2

[0038] Take 1000mL of refined cotton black liquor, the measured COD is 50650mg / L, and the conductivity is 3.38×10 4 μS / cm. with 30%H 2 SO 4Adjust the pH to 2.89, heat the water to a temperature of 30±1°C, let it stand for 60 minutes, and centrifuge to separate. The measured COD of the supernatant is 9180 mg / L;

[0039] After acid analysis, the supernatant enters the electrosorption device, the control voltage is 1.5V, the electrode distance is 1.5cm, the electrode material is activated carbon fiber, the hydraulic retention time is 30min, the COD of the effluent is 3670mg / L, and the conductivity is reduced to 2.0× 10 4 μS / cm;

[0040] The electro-adsorption effluent enters the anaerobic reactor equipped with anaerobic granular sludge, the temperature is controlled at 35±1°C, the dissolved oxygen is 0-0.3mg / L, the hydraulic retention time is 24h, and the effluent COD is 2140mg / L;

[0041] The anaerobic effluent enters the aerobic reactor, the temperature is controlled at 25...

Embodiment 3

[0044] Take 1000mL of refined cotton black liquor, the measured COD is 30650mg / L, and the conductivity is 2.78×10 4 μS / cm. with 30%H 2 SO 4 Adjust the pH to 3.11, heat the water to a temperature of 30±1°C, let it stand for 60 minutes, and centrifuge to separate. The measured COD of the supernatant is 7360 mg / L;

[0045] After acid analysis, the supernatant enters the electrosorption device, the control voltage is 1.5V, the electrode distance is 1.5cm, the electrode material is activated carbon fiber, the hydraulic retention time is 30min, the COD of the effluent is 1880mg / L, and the conductivity is reduced to 1.6× 10 4 μS / cm;

[0046] The electro-adsorption effluent enters the anaerobic reactor equipped with anaerobic granular sludge, the temperature is controlled at 35±1°C, the dissolved oxygen is 0-0.3mg / L, the hydraulic retention time is about 24h, and the COD of the effluent is 1360mg / L;

[0047] The anaerobic effluent enters the aerobic reactor, the temperature is co...

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Abstract

The invention discloses a combined process for refined cotton black liquid treatment, which develops a treatment process mainly used for a refined cotton black liquid produced in a refined cotton production course. The combined process comprises the following steps of introducing the refined cotton black liquid produced in the refined cotton production course into a pretreatment tank for acidification; introducing an acidified supernate into an electric adsorption device for treatment so as to improve biodegradability of wastewater; introducing electric adsorption effluents into an anaerobic reactor filled with anaerobic granular sludge for anaerobic degradation of wastewater; introducing anaerobic effluents into an aerobic reactor for further removing organic matters in wastewater; and then introducing the wastewater into an ultrafiltration membrane assembly so that COD (Chemical Oxygen Demand) of effluents reaches the emission standard. The combined process is developed for the black liquid produced in the refined cotton production course, namely, the combined process is designed for the cooked black liquid produced by cooking cotton linters through an alkaline method and enormous black brown wastewater produced by slurry washing. The combined process combines an acidification process, an electric adsorption process, an anaerobic and aerobic biological process and an ultrafiltration process for treating the refined cotton black liquid, solves the problem of difficult treatment of the refined cotton black liquid and is simple and easy to operate.

Description

technical field [0001] The invention belongs to the technical field of water treatment, and in particular relates to a combined process for treating refined cotton black liquor. Background technique [0002] Refined cotton, also known as cotton pulp or cotton pulp, is a kind of cellulose refined from cotton linters by alkaline cooking. Its main chemical components are cellulose, lignin and hemicellulose. It is composed of three elements: carbon, hydrogen and oxygen. The mass ratio of its composition is: carbon 44.4%, hydrogen 6.17%, oxygen 49.39%, and its density is generally 50-56g / cm 3 , specific heat capacity 30-40kJ / (kg·℃), soluble in cuproammonia solution, has good hydrophilicity and good adsorption. The general formula of refined cotton: (C 6 h 1005 ) n , where n is the degree of polymerization of cellulose, which represents the repeated basic chain link in the macromolecule of cellulose—glucose residues. The degree of polymerization of cotton fiber is generally 1...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F9/14C02F103/26
Inventor 周贵忠
Owner QINGDAO UNIV OF SCI & TECH
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