PTA废水生物处理工艺综述

PTA废水是由对二甲苯(PX)生产PTA过程中产生的排水。废水成分复杂,含大量芳香烃有机物,包括难降解有机物TA和甲基苯甲酸。分析了PTA废水中的芳香烃有机物好氧降解、厌氧降解机理以及TA降解机理。分析结果表明:芳香烃有机物好氧降解速率明显高于厌氧降解速。目前,对于PTA废水处理研究集中在好氧处理和厌氧处理工艺上,重点介绍了PTA废水厌氧、好氧及厌氧-好氧处理的几种工艺及其处理效果。综合投资、能耗、污泥量、操作、处理效率等多种因素,总结出PTA废水处理的最优工艺为厌氧-好氧处理工艺,常用工艺组合包括上旋流厌氧反应器+两级好氧、水解+A/O、两级A/O等。并讨论分析了重金属钴、锰,营养物质N,P,Mg,Fe等以及温度、pH对PTA废水处理效率的影响。同时,展望了PTA废水的研究发展趋势。

Review of Biological Treatment Process of PTA Wastewater

Purified Terephthalic Acid (PTA) wastewater contains a large number of aromatic hydrocarbon organic compounds, including refractory organic compounds of TA and methyl benzoic acid.In this article, the mechanisms of aerobic degradation and anaerobic degradation of aromatic hydrocarbons as well as TA degradation in PTA wastewater are analyzed.The rate of aerobic degradation is significantly higher than that of anaerobic degradation.At present, research on PTA wastewater treatment is focused on aerobic treatment and anaerobic treatment processes.Some technologies of aerobic, anaerobic and aerobic-anaerobic treatments as well as their effects are introduced.Aerobic-anaerobic treatment is summarized to be the optimal treatment process in comprehensive consideration of investment, energy consumption, sludge volume, operation, and processing efficiency.Vortex flow anaerobic reactor plus two-stage aerobic treatment, hydrolysis plus A/O, and two-stage A/O are common combinations.Furthermore, the influences of Co, Mn, nutrients, temperature and pH on the biological treatment of PTA wastewater are discussed.In addition, the development prospect of research trends in PTA wastewater treatment technology is also presented.