厌氧颗粒污泥对有机污染物的初期吸附机制

为研究厌氧颗粒污泥对废水中有机污染物的初期吸附机制,在实验室条件下,采用静态、序批的方法考察了活的和灭活的厌氧颗粒污泥对废水中有机污染物COD的初期吸附率之差异,推算了吸附过程中热力学参数值,并对厌氧颗粒污泥初期吸附有机污染物前后的红外光谱进行了比对分析,结果表明,厌氧颗粒污泥对废水中有机污染物的初期吸附是一个复杂的综合过程,初期吸附作用主要表现为物理吸附,占总吸附去除COD的70%多,其次为生物吸附,大约在总吸附去除COD的20%～35%之间。红外光谱分析表明,厌氧颗粒污泥表面上的一些功能基团参与了对有机污染物的吸附作用,这些基团包括-OH、-CH2、-CH3、P-H、C=O、C-N及S=O。

Mechanism of Initial Adsorption of Organic Pollutants onto Anaerobic Granular Sludge

Mechanisms of initial adsorption of organic pollutants in wastewater onto anaerobic granular sludge were studied. Differences between initial adsorption rate of COD in wastewater onto living and non-living anaerobic granular sludge were studied using a batch and static sorption method at laboratory scale,thermodynamics parameters in adsorption process were reckoned and comparison of infrared spectrum of anaerobic granular sludge before and post adsorption was made. Results showed that initial adsorption of organic pollutants in wastewater onto anaerobic granular sludge was a complicated and integrated process,with physical adsorption playing a significant role in initial adsorption process and accounting for more than 70% of total COD adsorption,followed by biosorption which accounting for 20%～35% of total COD adsorption amounts. Analysis of infrared spectrum showed that surface functional groups participated in adsorptive and complexation of anaerobic granular sludge onto organic pollutant,and the surface functional group included-OH,-CH2,-CH3,P-H,C=O,C-N and S=O.