涤纶碱减量废水中对苯二甲酸的兼性厌氧降解研究
Study on facultative biodegradability of terephthalic acid in polyester fabric alkali-peeling process wastewater
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摘要: 针对碱减量废水中的乙二醇（EG）对对苯二甲酸（TA）的好氧生物降解产生不利影响，本实验采用水解酸化工艺在实验室条件下研究了TA和EG的兼性厌氧降解性能，并着重考察了TA在EG存在下的兼性厌氧降解规律，从而为碱减量工艺实际生产废水的生物处理工艺提供技术方案和科学依据。实验结果表明，TA在缺氧条件下的兼性厌氧降解率很低，在本实验条件下，其兼性厌氧平均降解率为6.1%，而兼性厌氧菌对EG具有较高的降解活性，其降解率达到58.9%～71.5%。在TA配制废水中投加EG时，EG首先得到降解，当EG完全降解后，TA才开始降解，并且其降解速率与TA作为惟一碳源时TA的降解速率相同。由实验结果可知，涤纶碱减量废水的处理不能仅仅采用兼性厌氧生物处理工艺，而应在好氧生物处理工艺为主的情况下，辅以兼氧或厌氧生物处理工艺。Abstract: Aimed at the negative influence of ethylene glycol (EG) on the aerobic biodegradation of terephthalic acid (TA) in the polyester fabric alkali-peeling process wastewater (PAPwastewater), the facultative biodegradability of terephthalic acid (TA) and ethylene glycol (EG), especially the facultative biodegradability of TA in the presence of EG, were studied under the lab conditions by hydrolysis-acidification process. Under the anoxic condition there was a low biodegradability of TA with a mean removal rate of 6.11% when TA was served as the sole carbon source, while the removal rate of EG was 58.9%～71.5% when EG and TA were served as the feed under the same condition. The experimental results indicated that the facultative aerobe had a very low activity for TA, but higher for EG. EG could not enhance the facultative biodegradability of TA when EG was added to TA artificial wastewater. TA began to degrade gradually after EG was depleted, and the removal rate of TA was equal to that before EG was added. From these observations it was concluded that the aerobic biological treatment process should be employed in the treatment of PAP-wastewater, coupled with facultative or anaerobic biological treatment process.
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