城市污泥混合青霉素菌渣堆肥实验

Experimental study on co-composting of municipal sewage sludge and penicillin fermentation dregs

摘要:

为分析抗生素残留对菌渣堆肥过程的影响,以青霉素菌渣、市政脱水污泥和木屑为原料,研究好氧堆肥过程温度、碳素、氮素等理化参数的变化及青霉素的降解情况. 首先通过0.4 m³的大堆体研究菌渣好氧堆肥的可行性,然后通过5个6 L的小堆体详细研究菌渣污泥混合堆肥过程. 结果表明：菌渣污泥混合堆肥升温效果优于对照的单纯污泥. 堆肥菌渣质量分数与堆肥物料总有机碳（TOC）质量分数成正比,堆体的TOC质量分数随堆肥时间不断下降且趋于稳定,菌渣残留的青霉素未影响堆肥过程TOC的变化趋势. 投加菌渣增加了堆体的水溶性有机碳（WSOC）质量分数,生物可利用碳源的增加促进了堆肥过程微生物的转化作用,有助于堆肥过程温度的升高. 添加菌渣有助于减少堆肥原料中的氮素损失,且在第5天已检测不到菌渣中的抗生素残留. 可以通过混合堆肥实现菌渣的资源化利用及药物残留的分解.

Abstract:

Penicillin fermentation dregs, municipal sludge and saw dust were used as composting raw material to analyze the effect of antibiotic residue on aerobic composting process in this paper. The variation of such physicochemical parameters as temperature, carbon and nitrogen and the degradation of penicillin were analyzed during the aerobic compost process. The feasibility of composting with fermentation dregs was analyzed using 0.4 m3 volume reactors and the detail compost process were analyzed using five 6 L volume reactor. Results show that the temperature rise rate of co-compost process has an advantage over municipal sludge compost process. The content of total organic carbon (TOC) in mixed material is directly proportional to fermentation dregs, which also decreases with compost time and tends to stable finally. Results also show that the penicillin residue doesn’t affect the TOC varation trend. The water soluble organic carbon (WSOC) and microbial utilization carbon increases with the adding fermentation dregs, which is helpful to microbial transformation and contribute to increase the compost temperature. Adding fermentation dregs is also helpful to reduce the loss of nitrogen and no penicillin residue can be detected on the 5th day of composting process, which shows the resource utilization of fermentation dregs and the degradation of antibiotic residue can be achieved by co-compost process.