对-氯代苯胺(PCA)在填充床生物反应器中的降解作用

以氯代苯胺(PCA)为选择基质,用驯化技术从降解对二氯苯(p-DCB)的富集培养物中得到了以同化PCA为唯一碳源和氮源的混合微生物。将这种固定在填充床反应器中的微生物用于PCA的降解作用研究中。在该反应器里,PCA的生物降解遵循Logistic方程q=q_max/(1+e^α-βU_v).由方程求出了主要的动力学常数,K_s(半速率常数)和q_max(最大比基质降解速率).于PCA降解的同时,释放氯离子到培养基中。在水力停留时间3h, 进水PCA浓度为360mg·L^-1情况下,基质的体积降解率达到125mg·L^-1·h^-1;基质的百分去除率为91%.

Degradation of p-chloroaniline(PCA) in packed-bed bioreactor

With p-chloroaniline(PCA) as a selected substrate, the mixed microorganisms assimilating it as the sole source of carbon and nitrogen were obtained by acclimation technique from the enriched cultural products of degraded p dichlorobenzen(p-DCB). The mixed microorganisms immobilized in a packed-bed reactor were used to degrade PCA. In the packed-bed bioreactor, the biodegradation of PCAfollowed the Logistic equation, q = q_max /(1+e^α-βU_v ). The major kinetic parameters, K_s (half velocity constant) and q_max (maximum specific substrate degradation rate), were calculated. PCA was found to be degraded with a concomitant release of chloride ions into the substrate. Under the conditions of residence time of 3 hours and inlet stream at PCAconcentration of 360mg·L^-1, the volumetric degradation rate of the substrate was 125mg·L^-1·h^-1, with removal efficiency of 91%.