以煤热解废水为研究对象,采用厌氧流化床微生物燃料电池(AFB-MFC)进行生化处理,考察了COD对系统产电及废水处理性能影响,并通过GC/MS内标法分析了反应体系中有机物组成及酚类物质的降解特性。结果表明,进水COD为952~2 238 mg/L时,输出...以煤热解废水为研究对象,采用厌氧流化床微生物燃料电池(AFB-MFC)进行生化处理,考察了COD对系统产电及废水处理性能影响,并通过GC/MS内标法分析了反应体系中有机物组成及酚类物质的降解特性。结果表明,进水COD为952~2 238 mg/L时,输出电压及功率密度随COD增加而提高,最高分别为284.5 m V和2.13 m W/m^2,当COD为3 419 mg/L,输出电压和功率密度分别降低至245.7 m V和1.42 m W/m^2,说明过高的COD负荷会抑制微生物产电活性;COD去除率最高可达到92%,且随着进水COD的提高而有所下降。GC/MS结果表明,酚、苯、醇、杂环化合物与多环芳烃等物质充分降解,去除率分别为99.63%、97.55%、98.30%、95.75%和92.87%。准确分析了其中主要的5种酚类的质量浓度,该方法检出限为2.48~5.50μg/L,R^2大于0.993,平均加标回收率为72.6%~115.8%。展开更多
The sonolytic degradation of 2-chlorobiphenyl was investigated. Mass spectroscopy was used to detect the products of sonolytic degradation of 2-chlorobiphenyl. The results show that the products of sonolytic degradati...The sonolytic degradation of 2-chlorobiphenyl was investigated. Mass spectroscopy was used to detect the products of sonolytic degradation of 2-chlorobiphenyl. The results show that the products of sonolytic degradation, such as biphenyl, ethyl benzene, diethylbiphenyl, dibutylbiphenyl, phenol, propylphenol and di-tert-butyl phenol are produced by thermolysis and hydroxyl free radical reactions, in which biphenyl counts for almost 40%（mole fraction） of the mother compound and others are at trace level. Rapid accumulation of chloride ion shows quick dechlorination, and 78% organic chlorine is converted into chloride ion. Free radical scavengers, bicarbonate and carbonate, decrease the reaction rate of sonolytic degradation of 2-chlorobiphenyl significantly, and the pseudo 1st order rate constant of sonolytic degradation of 2-chlorobiphenyl decreases linearly with the natural logarithm of the concentration of the added free radical scavenger, showing that the pyrolysis and hydroxyl free radical reaction are the two major pathways for the sonolytic degradation of 2-chlorobiphenyl, in which the hydroxyl radical concentration is estimated to be 1×10-10 （mol/L.）展开更多
This paper studies the effect of reducing sugar concentration, reducing sugar yield and byproducts furfural concentration that generate by straw under the condition of acid concentration and flow rate in the gradient ...This paper studies the effect of reducing sugar concentration, reducing sugar yield and byproducts furfural concentration that generate by straw under the condition of acid concentration and flow rate in the gradient temperature hydrolysis process （60℃-230℃）, we can conclude that reducing sugar yield is highest when the concentration of sulfuric acid is 1%, the velocity of reaction liquid is 25mL/min, at the highest concentration of wheat straw yield of reducing sugar up to 32.9g/L, the reducing sugar yield was 60.8%. At this point the furfural concentration is lower than 1.0g/L, but in the entire gradient heating process, reducing sugar concentration peak of furfural concentration peak appears in the temperature lower, can realize the separation of the reducing sugar and furfural good, reduce the inhibition of fermentation by- products such follow-up treatment process.展开更多
文摘以煤热解废水为研究对象,采用厌氧流化床微生物燃料电池(AFB-MFC)进行生化处理,考察了COD对系统产电及废水处理性能影响,并通过GC/MS内标法分析了反应体系中有机物组成及酚类物质的降解特性。结果表明,进水COD为952~2 238 mg/L时,输出电压及功率密度随COD增加而提高,最高分别为284.5 m V和2.13 m W/m^2,当COD为3 419 mg/L,输出电压和功率密度分别降低至245.7 m V和1.42 m W/m^2,说明过高的COD负荷会抑制微生物产电活性;COD去除率最高可达到92%,且随着进水COD的提高而有所下降。GC/MS结果表明,酚、苯、醇、杂环化合物与多环芳烃等物质充分降解,去除率分别为99.63%、97.55%、98.30%、95.75%和92.87%。准确分析了其中主要的5种酚类的质量浓度,该方法检出限为2.48~5.50μg/L,R^2大于0.993,平均加标回收率为72.6%~115.8%。
文摘The sonolytic degradation of 2-chlorobiphenyl was investigated. Mass spectroscopy was used to detect the products of sonolytic degradation of 2-chlorobiphenyl. The results show that the products of sonolytic degradation, such as biphenyl, ethyl benzene, diethylbiphenyl, dibutylbiphenyl, phenol, propylphenol and di-tert-butyl phenol are produced by thermolysis and hydroxyl free radical reactions, in which biphenyl counts for almost 40%（mole fraction） of the mother compound and others are at trace level. Rapid accumulation of chloride ion shows quick dechlorination, and 78% organic chlorine is converted into chloride ion. Free radical scavengers, bicarbonate and carbonate, decrease the reaction rate of sonolytic degradation of 2-chlorobiphenyl significantly, and the pseudo 1st order rate constant of sonolytic degradation of 2-chlorobiphenyl decreases linearly with the natural logarithm of the concentration of the added free radical scavenger, showing that the pyrolysis and hydroxyl free radical reaction are the two major pathways for the sonolytic degradation of 2-chlorobiphenyl, in which the hydroxyl radical concentration is estimated to be 1×10-10 （mol/L.）
文摘This paper studies the effect of reducing sugar concentration, reducing sugar yield and byproducts furfural concentration that generate by straw under the condition of acid concentration and flow rate in the gradient temperature hydrolysis process （60℃-230℃）, we can conclude that reducing sugar yield is highest when the concentration of sulfuric acid is 1%, the velocity of reaction liquid is 25mL/min, at the highest concentration of wheat straw yield of reducing sugar up to 32.9g/L, the reducing sugar yield was 60.8%. At this point the furfural concentration is lower than 1.0g/L, but in the entire gradient heating process, reducing sugar concentration peak of furfural concentration peak appears in the temperature lower, can realize the separation of the reducing sugar and furfural good, reduce the inhibition of fermentation by- products such follow-up treatment process.
