含易降解有机质时对苯二甲酸(TA)厌氧降解动力学

Kinetics for Terephthalic Acid Anaerobic Degradation with Easily Biodegradable Organic Material Co-existence

含易降解有机物的对苯二甲酸有机废水在厌氧处理时 ,其中的易降解有机质通过甲烷发酵被优先利用 ,其中间代谢物对对苯二甲酸的降解有抑制作用 ,同时 ,对苯二甲酸自身的降解也存在底物抑制现象。本文建立了有易降解有机质存在时对苯二甲酸厌氧降解的抑制动力学模型方程 :q=qmaxSS +KS[1+(I- 0 .86 ) /Ki,i]+S2 /Ki,S,并利用非线性回归 ,确定了模型参数 qmax =1972 .0mgTA/ gVSS·d ;Ks =2 0 .2 844gTA/L ;Ki,i =2 .0 41gCOD/L ;Ki,s =0 .0 10 8gTA/L ,实验数据对该动力学方程能较好拟合。在此基础上提出两段厌氧处理新工艺。

The fact of preferential substrate utilization results in a sequence of substrate attack.As typically,the easily biodegradable substrates in TA\|containing wastewater are degraded firstly through methane fermentation pathway,and just those intermediate metabolites have been proved to be inhibitors for TA biodegradation.Moreover,TA itself can inhibit the TA biodegradation,too.A kinetic model for the anaerobic digestion of wastewater containing both TA and easily biodegradable pollutants is constructed as q=q max SS+K\-S[1+(I-0.86)/K i,i ]+S 2/K i,S ,The model parameters are estimated with non\|linear regression method,the values are as follows:q max =1972.0 mgTA/gVSS·d; K s =20 2844gTA/L; K i,i =2.041 gCOD/L; K i,s =0.0108 gTA/L.The experimental data verification for the model equation is satisfactory.According to the model analysis,a new strategy,a two\|step anaerobic system,dealing with this kind of wastewater is suggested.