几种分散染料的生物降解特性研究

发布时间：2018-03-31 12:54

本文选题：分散染料　切入点：生物降解　出处：《东华大学》2016年硕士论文

【摘要】：随着涤纶纺织品的广泛应用,上染涤纶纤维最常用的分散染料的品种和用量也在逐年增长,随之而来的分散染料废水成分越来越复杂、废水量也越来越大。目前,在染料废水处理方法中仍以生物法为主,分散染料废水生物降解问题是废水处理的一个重点问题。本实验即是考察了厌氧、好氧、厌氧/好氧交替3种不同条件下Neocron Black、Rhodamine B、分散大红S-BWFL、分散红S-5BL这4种分散染料的降解情况。并通过剩余染料浓度和COD值来分析染料的降解速率和初始反应条件对降解过程的影响,同时通过气相色谱-质谱联用(GS-MS)测定降解中间产物,分析其降解历程。本研究结果可为分散染料废水的生物降解提供可行性支持,也对其可能的降解产物提供依据。(1)在好氧、厌氧、厌氧/好氧条件下,采用活性污泥法降解分散染料Neocron Black(NB),研究该染料的生物降解特性,并初步探讨该染料的生物降解过程。研究结果表明,NB染料在好氧条件下降解率最高,厌氧/好氧交替条件次之,厌氧条件下染料降解率最低;随着进水染料浓度的增加,微生物对染料的降解率逐渐下降,而添加易生物降解碳源可以促进NB染料的降解;NB染料降解最佳初始pH为7。全波段扫描结果显示,NB染料经过12h生物降解作用后,其发光基团得到较彻底降解。GC-MS测得NB染料生物降解中间产物有2,4-二硝基苯胺、2-氰基-4-硝基苯胺、对硝基苯胺等。(2)在好氧、厌氧、厌氧/好氧条件下,采用活性污泥法生物降解分散染料Rhodamine B,实验结果表明在48h反应过后最大去除率为7.0%。(3)在好氧、厌氧、厌氧/好氧条件下,采用活性污泥法降解染料分散大红S-BWFL。实验结果表明分散大红S-BWFL在厌氧条件下降解率最高,厌氧/好氧交替条件次之,好氧条件下降解率最低;随着进水染料浓度的增加,微生物对染料的降解率逐渐下降,而添加易生物降解碳源可以促进分散大红S-BWFL的生物降解;分散大红S-BWFL降解最佳初始pH为8。全波段扫描结果显示,分散大红S-BWFL经过12h生物降解作用后,其发光基团得到较彻底降解。GC-MS测得分散大红S-BWFL生物降解中间产物有对硝基苯胺、邻苯二甲酸单(2-乙基己基)酯和对硝基苯甲醚。(4)在好氧、厌氧、厌氧/好氧条件下,采用活性污泥法降解染料分散红S-5BL。实验结果表明分散红S-5BL在厌氧条件下降解率最高,厌氧/好氧交替条件次之,好氧条件下降解率最低;随着进水染料浓度的增加,微生物对染料的降解率逐渐下降,而添加易生物降解碳源可以促进分散红S-5BL的生物降解率;分散红S-5BL降解最佳初始pH为8。全波段扫描结果显示,分散红S-5BL经过12h生物降解作用后,其发光基团得到较彻底降解。GC-MS测得分散红S-5BL生物降解中间产物有2-氯-4-氨基苯胺和邻苯二甲酸单(2-乙基己基)酯。
[Abstract]:With the wide application of polyester textiles, the variety and dosage of disperse dyes most commonly used in dyeing polyester fiber are increasing year by year. The composition of disperse dye wastewater is becoming more and more complex and the waste water quantity is increasing.At present, biological treatment is still the main method in dye wastewater treatment, and the biodegradation of disperse dye wastewater is an important problem in wastewater treatment.The degradation of four disperse dyes, Neocron Black-Rhodamine B, disperse reddish S-BWFLand disperse red S-5BL, was investigated under three different conditions: anaerobic, aerobic and anaerobic / aerobic alternations.The results of this study can provide a feasible support for the biodegradation of disperse dye wastewater, and also provide a basis for the possible degradation products of disperse dye wastewater under aerobic, anaerobic, anaerobic / aerobic conditions.The biodegradation characteristics of the disperse dye, Neocron, were studied by activated sludge method, and the biodegradation process of the dye was discussed.The results showed that the degradation rate of niobium dyes was the highest under aerobic conditions, followed by alternative anaerobic / aerobic conditions, and the lowest under anaerobic conditions, and the degradation rate of dyes gradually decreased with the increase of influent dye concentration.The optimum initial pH value of NB dye degradation was 7. 2%, while the addition of easily biodegradable carbon source could promote the degradation of NB dye.The results of full-band scanning showed that after 12 h biodegradation, the luminescent groups of NB dyes were completely degraded. GC-MS determined that the intermediate products of biodegradation of NB dyes were 2o 4-dinitroaniline 2-cyano-4-nitroaniline, p-nitroaniline, etc.) in aerobic condition.Under anaerobic, anaerobic / aerobic conditions, the biodegradation of disperse dye Rhodamine B by activated sludge was carried out. The experimental results showed that the maximum removal rate of Rhodamine B was 7. 0% after 48 h reaction) under aerobic, anaerobic, anaerobic / aerobic conditions.The dye disperse red S-BWFL was degraded by activated sludge process.The results showed that the degradation rate of disperse scarlet S-BWFL was the highest under anaerobic condition, followed by alternative anaerobic / aerobic condition, and the lowest under aerobic condition, and the degradation rate of dye decreased gradually with the increase of influent dye concentration.The addition of easily biodegradable carbon sources could promote the biodegradation of disperse reddish S-BWFL, and the optimum initial pH was 8.The results of full-band scanning showed that after 12 h biodegradation of disperse reddish S-BWFL, its luminescent group was completely degraded. GC-MS determined that the intermediate product of disperse reddish S-BWFL biodegradation was p-nitroaniline.Dye disperse red S-5BL was degraded by activated sludge method under aerobic, anaerobic, anaerobic / aerobic conditions.The results showed that the degradation rate of disperse red S-5BL was the highest in anaerobic condition, followed by alternative anaerobic / aerobic condition, and the lowest in aerobic condition, and the degradation rate of dye decreased gradually with the increase of influent dye concentration.The biodegradation rate of disperse red S-5BL was improved by adding easily biodegradable carbon source, and the optimum initial pH of disperse red S-5BL was 8.The results of full-band scanning showed that after 12 h biodegradation of disperse red S-5BL, its luminescent group was completely degraded. GC-MS determined that the intermediate products of disperse red S-5BL biodegradation were 2-chloro-4-aminoaniline and mono-2-ethylhexyl phthalate.
【学位授予单位】：东华大学
【学位级别】：硕士
【学位授予年份】：2016
【分类号】：X791

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