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Treatment of Printing and Dyeing Wastewater by Biofilm Reactor

Author: ZhuHaiYan
Tutor: YaoBingHua；TianPing
School: Xi'an University of Technology
Course: Environmental Engineering
Keywords: Biofilm Reactor Dyeing wastewater Crystal Violet Kinetic model Wastewater treatment
CLC: X791
Type: Master's thesis
Year: 2006
Downloads: 405
Quote: 1
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Abstract


Printing and dyeing industry, China's industrial wastewater discharge large, large amount of water, high-color, complex composition. Dye discharged into water cauced the reduce the transmittance of the water, resulting in the destruction of aquatic ecosystems, bioaccumulation and has a three-induced (carcinogenic, teratogenic, mutagenic) role. Biodegradable dyeing wastewater treatment, the biofilm reactor adaptable to changes in water quality and quantity of wastewater, biomass, sludge bulking problem, high processing efficiency, has drawn wide attention in recent years. In this study, activated carbon as the carrier Guinness bacteria Kingella H-hanging membrane strains, the the immobilized microbial biofilm reactor characteristics, operating conditions of the reactor, substrate removal and biofilm growth dynamics simulated wastewater actual wastewater contrast processing, obtaining the following results: (1) the immobilized the Guinness bacteria Kingella H characteristic study investigated the concentration of microorganisms, liquid ionic strength, pH and temperature of the initial suspension of microorganisms in the carrier attached fixed. The results show that the fixed biomass on the carrier also increases with the increase of the concentration of bacteria in the initial suspension and stabilized. The fixed biomass and the liquid phase is proportional to the ionic strength, particularly at an ionic strength of 0.01 0 .20 mol / L range increases significantly. Liquid phase pH 6, fixed biomass on the carrier up, reached 28.9μg/cm 2 , and the best fixed temperature of 35 ° C. Kinetic studies, Kingella H follow a reversible reaction kinetics in the activated carbon surface adhesion fixed behavior. The determination which is attached a fixed kinetic equation is: 1 / B = 1.4697 (1 / t) 0.025. (2) for the bacteria to the Guinness bacteria Kingella H hanging glass column filled with activated carbon membrane immobilized biofilm reactor. Analysis and examines the impact of factors on the concentration of carbon source, nitrogen source concentration, dye concentration, treatment time, initial pH, water temperature and the amount of aeration biofilm reactor wastewater treatment crystal violet (CV). The orthogonal experiment factors to affect biofilm reactor wastewater treatment order was: time gt; temperature gt; concentration of carbon source gt; nitrogen concentration gt; pH value gt; dye concentration. The results showed that lower concentrations of carbon and nitrogen sources to maintain the normal operation of the reactor, to achieve the desired bleaching effect; CV certain inhibitory effect on the activity of the biofilm reactor can still make the concentration up to 500mg / L CV simulated wastewater within 30min decolorization rate was maintained at more than 97%; reactor operating conditions: water at pH 7, the temperature was 35 ° C, the process aeration rate 180L/min. (3) based on the material balance of the substrate to the biofilm reactor, substrate removal and biofilm growth dynamics derived the CV removal dynamics mathematical model of the reactor to: the biofilm general growth dynamics The mathematical model: CV dye certain inhibitory effect on the growth of the biofilm, the introduction of the substrate inhibition constant K IS suppressed growth dynamics mathematical model: determine the kinetic parameters: The maximum specific growth rate of the biofilm μ max = 0.0287d -1 ; the biofilm yield coefficient Y obs obey the equation y = 129.59x < sup> -1.1121 ; average biofilm thickness d of | - = 79.42μm; biofilm average dry density ρ = 1.028 × 10 6 g / m 3 . (4) at the optimum operating conditions, the application of the biofilm reactor compared CV wastewater and dyeing wastewater treatment, the simulated wastewater decolorization rate of more than 95%, COD Cr removal rate more than 90%; the actual wastewater decolorization rate of 78% 9 the COD Cr removal rate of 76% 9 0% between. It is suggested that the biofilm reactor has good prospects for industrial applications, the value of further research to enlarge.

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CLC: > Environmental science, safety science > Processing and comprehensive utilization of waste > Light industrial waste disposal and comprehensive utilization > Textile, printing and dyeing industry
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