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Research on the Treatment of Acrylic Wastewater by EGSB-BAF Process

Author: LiuZuoYue
Tutor: LvBingNan
School: Harbin Institute of Technology
Course: Municipal Engineering
Keywords: Industrial wastewater Acrylic fiber wastewater Nonbiodegradable Microbial culture Drop cyanide strains
CLC: X703
Type: Master's thesis
Year: 2008
Downloads: 66
Quote: 1
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Abstract


At home and abroad on the treatment of wastewater containing cyanide has been the study of a variety of methods, should be considered first for high levels of cyanide wastewater recycling; wastewater with low cyanide content before processing. The recycling methods acidification aeration - lye the absorption spectrometry recycling sodium cyanide solution, to resolve Preparation yellow blood salt. The treatment methods are alkaline chlorination, oxidation method, electrolysis method, pressurized hydrolysis method (resin and activated carbon, etc.) and the adsorption method, a biochemical method, which has reached a practical stage and the wider application of alkaline chlorination law, belong to the large-scale facilities acidification aeration, biological treatment method. Acrylic fiber plant in Daqing Daqing petrochemical plant in Daqing City, Daqing Petrochemical Company uses a two-step wet process production of acrylic sodium thiocyanate solvent. Wastewater generated by the polymerization of acrylic workshop, spinning and recovery devices such as wastewater and acrylonitrile, sodium thiocyanate and acetone cyanohydrin device into the acrylic fiber wastewater treatment plant processing, the main reason is that the acrylic fiber wastewater biodegradability poor. Acrylic fiber wastewater measured BOD / COD 0.25 to 0.28, from the theory are more difficult biodegradable industrial wastewater. In this study based on acrylic fiber wastewater characteristics, combined anaerobic - aerobic treatment process, the specific process for expanded granular sludge bed EGSB (Expended Granular Sludge Bed) and activated carbon Biological Aerated Filter (BAF) combination of biological treatment processes . The EGSB reactor as well as the operation of biological aerated filter, acrylic fiber wastewater organic pollutants and cyanide and other toxic substances are effectively remove. The specific performance in the COD, SS, turbidity, cyanide concentration in the reactor have been removed effectively. And analysis of these parameters, further investigate the influencing factors and operating characteristics of the two reactors, to confirm the feasibility of anaerobic - aerobic the Combined Process acrylic organic wastewater. EGSB reactor into the stable operation period, basically mature granular sludge wastewater sludge in the reactor has to adapt to nature and have the ability to remove organics, and which cultivate a dedicated drop cyanide strains COD. removal rate stabilized at around 60%, the removal rate of cyanide in the 50% to 65% of the average SS removal efficiency of 60%. BAF reactor and stable operation period, through adsorption and microbial degradation, COD removal to an average of about 60%, the average turbidity removal rate stabilized at between 50% to 60%, the removal rate of cyanide in 60% to 70%. And microbial bioassays, proved that exclusive drop cyanogen bacteria. The two reactor COD removal efficiency of 70% to 80%. Cyanide removal rate stabilized at 90%. Turbidity removal in 60% to 70%. Reactor EGSB-BAF combined process to prove the feasibility of this combined process Wastewater By.

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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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