基于批式呼吸计量法的溶解性COD组分划分

Fractionation of Soluble COD in Wastewater Based on Batch Respirometric Method

利用批式好氧呼吸计量法结合溶解性慢速水解COD(SH)水解动力学拟合提出了溶解性COD(SCOD)的组分划分方案.上海2个污水处理厂进水的SCOD组分划分结果表明,A厂沉砂池出水(典型生活污水)的SCOD中含有43.5%～58.6%SH、21.8%～35.2%易生物降解COD(SS)和15.4%～30.9%溶解性惰性COD(SI);B厂沉砂池出水(长距离输送的合流制污水)SCOD中含有34.5%～45.2%SH、29.3%～37.7%SS和25.6%～31.2%SI.9组不同水样的试验拟合结果表明,一级动力学能够很好地描述SH的水解过程,A厂和B厂进水SH的水解速率常数分别为28.00～39.77 d-1和26.48～29.52 d-1.该组分划分方案能够实现SS积分区域的理论划分,并消除溶解性微生物产物对SI测定的影响.

A fractionation protocol of soluble COD （SCOD） was put forward by combining respirometric method with hydrolysis kinetics of soluble slowly biodegradable COD （SH）. SCOD fractionation results of two wastewater treatment plants （WWTP） in Shanghai show that the SCOD in sand basin effluents （typical domestic wastewater） of WWTP A is composed of 43.5%-58.6% SH, 21.8%-35.2% readily biodegradable COD （Ss） and 15.4%-30.9% soluble inert COD （S1）, and those SCOD fractions in sand basin effluents （combined sewers after long pipeline transportation） of WWTP B are 34.5 % -45.2 %, 29.3 % -37.7 % and 25.6 % -31.2 %, respectively. The linear regression results of respirometric tests data from nine samples demonstrate that the first-order kinetics can reliably describe hydrolysis process of SH, and the kinetic constants of SH from WWTP A and B are respectively 28.00-39.77 d^-1 and 26.48-29.52 d^-1 . Experimental results demonstrate that this protocol can achieve theoretical partition for the integration area of Ss, and also eliminate the effect of soluble microbial products on S1 determination.