基于批式呼吸计量法的溶解性COD组分划分

利用批式好氧呼吸计量法结合溶解性慢速水解COD(S_H)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% S_H、 21.8%～35.2%易生物降解COD(S_S)和15.4%～30.9%溶解性惰性COD(S_I); 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% S_H、 29.3%～37.7% S_S和25.6%～31.2% S_I. 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S_H的水解过程,A厂和B厂进水S_H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S_S积分区域的理论划分,并消除溶解性微生物产物对S_I测定的影响.

Fractionation of Soluble COD in Wastewater Based on Batch Respirometric Method

A fractionation protocol of soluble COD (SCOD) was put forward by combining respirometric method with hydrolysis kinetics of soluble slowly biodegradable COD (S_H). 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% S_H, 21.8%-35.2% readily biodegradable COD (S_S) and 15.4%-30.9% soluble inert COD (S_I), 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 S_H, and the kinetic constants of S_H 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 S_S, and also eliminate the effect of soluble microbial products on S_I determination.