不同类型外加碳源对制药污泥堆肥过程中青霉素降解的影响

Influence of carbon-rich amendments on penicillin degradation during pharmaceutical sewage sludge composting

以制药污泥为研究对象,采用葡萄糖、蔗糖、玉米秸秆粉及其混合物作为外加碳源,研究不同类型的外加碳源对堆肥系统一次发酵周期内温度、有机质等理化参数变化及青霉素的降解情况的影响.结果表明,堆体中有机质含量与外加碳源的量呈正比,堆体中有机质的质量分数随堆肥时间不断下降且趋于稳定.温度是青霉素降解的主要影响因素.外加碳源增加了堆体溶解性有机质质量分数,生物可利用碳源的增加促进了堆肥过程中微生物的转化作用,并有助于提高堆肥过程温度.在堆肥周期内外加碳源可以提高青霉素的降解速率(15 d内对照组青霉素降解率为94.44%,其他组均大于95%),且外加蔗糖与玉米秸秆粉的混合碳源处理组青霉素降解速率最快(15 d内降解率可达到99.08%).堆肥过程中升温阶段(中温阶段和高温阶段)青霉素含量与温度呈负相关(P<0.01),与溶解性有机碳呈正相关(P<0.01).15 d内所有处理组青霉素降解率均可以达到90%以上.

In order to investigate the changes of physico-chemical parameters such as temperature,organic matter and the degradation of penicillin during the first fermentation cycle of the composting system with different types of additional impact from carbon sources,different additional carbon sources（ glucose,sucrose and stalk powder） were added during pharmaceutical sludge composting stage. Results in this study indicated that the contfent of organic matter（ OM） in the mixed material was directly proportional to carbon sources,which also decreased with compost time and became steady at the later stage of the process. Our result also indicated that thermal degradation mightcontribute to the degradation of penicillin during sludge composting. The dissolved organic carbon（ DOC） and microbial utilization of carbon increased with the rates of carbon source addition,which is due to the increase of microbial transformation and therefore the increase of the compost temperature. Adding carbon sources facilitated the degradation rate of penicillin（ the control group94.44% in 15 days and more than 95% in the other groups）,and these rate was the highest in the mixture of sucrose and cornstalk powder（ within 15 days the degradation rate can reach 99. 08%）.Penicillin content was negatively correlated with temperature（ P〈0.01） and dissolved organic carbon（ P〈0.01） during the warming phase（ middle temperature stage and high temperature stage） in composting process. The degradation rate of penicillin reached more than 90% within 15 days in all treatments.