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The Study on the Futher Treatment of Acrylic Fiber Wastewater after Biotreatment

Author: WangMingMing
Tutor: YangFengLin
School: Dalian University of Technology
Course: Environmental Engineering
Keywords: Acrylic fiber wastewater Flocculation Advanced Oxidation Nanofiltration
CLC: X703
Type: Master's thesis
Year: 2010
Downloads: 116
Quote: 2
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Abstract


Of acrylic fiber wastewater biochemical the water generally difficult to substandard status quo and explore the use of physical and chemical methods to its depth. Acrylic biological wastewater effluent treatment, flocculation, O3/UV advanced oxidation and nanofiltration membrane separation technology three kinds of physical and chemical methods and effects of the treatment effect. Draw the following conclusions: (1) biochemical acrylic fiber wastewater effluent coagulation treatment, more PAC polymerization ferric chloride and ferric chloride the three flocculation (mixed) coagulant coagulation effect, determine trichloro of iron flocculant. COD removal efficiency of turbidity removal and floc size distribution as basis for further investigation of its dosage, dosage, pH, coagulant aids polyacrylamide flocculation effect and stirring speed floc strength and floc structure. The results show that: the ferric chloride dosage of 90 mg L-1, the the PAM investment and increase the amount of 2.1mg · L-1, and do alkalinity supplement dosage 3mg · L-1 calcium oxide, stirring speed the strength and the morphology of the flocs formed in about 80 rpm ideal. Coagulation test effluent COD, turbidity and other indicators to meet the requirements of subsequent processing, which can reach more than 22% COD removal efficiency. (2) the use of O3/UV synergistic Advanced Oxidation Process acrylic biological wastewater effluent, initial pH value adjustment reaction, to examine the treatment of COD removal efficiency change, and to observe the reaction time on COD removal efficiency; reduce sewage the concentration of pollutants observed treatment effect; trying to add the appropriate amount of sodium bicarbonate to the reaction with water, without added observe changes in the COD removal efficiency. Experimental results show that this case, the removal rate of more than 35% when the reaction time is within 30min, COD removal, and time (t) to maintain a linear relationship between the reaction time is 30 min and reached the removal inflection , continue to extend the reaction time efficiency is not high; initial reaction pH range of 6-8.5. The experiment also found that raw sewage diluted 2-fold more reasonable then advanced oxidation processes; to help COD removal can shorten the reaction time required for adding the right amount of NaHCO3 sewage. (3) nanofiltration membrane separation technology to the wastewater treatment efficiency is very high, single-stage processing, the COD removal efficiency can reach more than 85%, TN removal in about 60% of ammonia removal efficiency of 78% . Contribute to the removal of ammonia sulfate ions due to the electrostatic interactions between ions, originally present in the sewage. Since most of the wastewater nitrification inhibitor molecular weight below 500, it can be used nitration methods processing nanofiltration concentrate ammonia nitrogen removal rate is greater than 90%. Using two nanofiltration, contribute to the removal of COD and ammonia nitrogen. The nanofiltration membrane long-running, water quality and stability.

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CLC: > Environmental science, safety science > Processing and comprehensive utilization of waste > General issues > Wastewater treatment and utilization
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