以聚己内酯作为生物反硝化固体碳源的研究  

Investigation of biological denitrification using biodegradable polymers cascade mini ring as carbon source

作　　者：梁捷[1] 缪恒锋[1] 任洪艳[1] 赵明星[1] 黄振兴[1] 阮文权[1] 

机构地区：[1]江南大学环境与土木工程学院,无锡214122

出　　处：《环境工程学报》2015年第2期633-638,共6页Chinese Journal of Environmental Engineering

基　　金：国家"水体污染控制与治理"科技重大专项(2012ZX07101-013-04)

摘　　要：为解决水体因低碳氮比而导致脱氮效率差的问题,将颗粒聚己内酯(PCL)重新塑形为阶梯环状,研究其作为反硝化过程的生物膜载体与固相碳源的反硝化性能。结果表明,在静态实验中,平均反硝化速率为8.57 mg NO3-N/(L·h);反硝化过程为零级反应。连续填充床实验中,超过90%的硝酸盐可被去除,出水NO2-N质量浓度低于0.20 mg/L;出水NH3-N质量浓度略有上升;出水溶解性有机碳(DOC)先上升后降低至1 mg/L左右。电子扫描显微镜扫描显示,PCL阶梯环反应表面空隙率较高,表面生物膜以杆菌为主,反应后被明显腐蚀;液相色谱检测显示PCL阶梯环分子量反应前后略有下降,其结构未受到破坏;表明该材料适合作为反硝化反应的碳源的同时,又可以作为载体供微生物附着生长。Polycaprolactone(PCL) was reshaped into cascade mini ring(CMR) served both as solid carbon source and biofilm carrier for denitrification in wastewater with low C:N ratio.Results from batch experiments showed that denitrifying microbes could easily adapt to utilize PCL with the average denitrification rate as8.57 mg NO3-N/(L·h),and the denitrification process well followed the zero-order reaction kinetics,indicating that PCL was suitable denitrification carbon source for municipal sludge.Data from the continuous packed bed reactor with PCL CMR demonstrated that more than 90% NO3-N was removed without NH3-N,NO2-N and DOC accumulation.Further research into surface characteristics and molecular weight changes of PCM CMR were illustrated by SEM and GPC,respectively.Resulted showed that PCM CMR could be assimilated by microbes and the main microbes and bacteria on biofilm were bacillus.However,the main structure was not destroyed after biological reaction.

关 键 词：反硝化 生物可降解聚合物 阶梯环 固相碳源 生物膜载体 

分 类 号：X52[环境科学与工程—环境工程]