摘要
文章研究不同条件下锯末、玉米芯及黄秋葵秸秆作为微生物反硝化碳源时的脱氮性能,筛选出优质固体碳源和反应条件,为氮污染去除现场应用提供参考。试验结果表明:在不同碳源用量(0.25、0.50、1.00、2.00g)条件下,3种碳源的硝酸盐去除率均表现出随着用量增加呈先上升后下降的趋势,其中玉米芯比其他2种碳源的脱氮效果更好,当玉米芯的用量为1.00g时硝酸盐的去除率最高,达98.3%;不同温度条件下的优化试验结果表明,35℃时玉米芯组的微生物对硝酸盐的反硝化效果最好,其去除率达98.5%。在地下水动态模拟试验中选用玉米芯为填充介质,其去除率与进水NO_3-N的初始质量浓度之间有很好的相关性,初始质量浓度升高,去除率降低但去除量升高,且随着进水流速减小,NO_3-N的去除率升高。
The denitrification performance of sawdust,corncob and okra straw used as microbial denitrifying carbon source under different conditions was studied and compared in order to screen highquality solid carbon source and reaction conditions and provide reference for the relevant application in contaminated sites.The experimental results show that the three groups of carbon sources have different nitrogen removal effects,and the corncob has better nitrogen removal effect than the other two carbon sources.Under the condition of the different dosage of carbon sources（0.25 g,0.50 g,1.00 g,2.00 g）,the nitrate removal rate of three groups of carbon sources first increases with the increasing dosage,and then decreases,the highest removal rate reaches 98.3% when the dosage of corncob is 1.00 g;as for different temperature conditions,the nitrate denitrification effect of the corncob group is the best when the temperature is 35 ℃,and the removal rate reaches 98.5%.In the dynamic simulation experiment of groundwater,corncob is selected as the filling medium,and the results show that there is a good correlation between the initial concentration of influent nitrate nitrogen and removal rate,with the increase of initial concentration,the removal rate is reduced but the removal amount increases,and with the decrease of inlet velocity,the nitrate removal rate increases.
作者
龚荧
马雷
杨章贤
刘建奎
李宇博
万文华
GONG Ying;MA Lei;YANG Zhangxian;LIU Jiankui;LI Yubo;WAN Wenhua(School of Resources and Environmental Engineering,Hefei University of Technology,Hefei 230009,China;Anhui Institute of Geo-Environment Monitoring,Hefei 230001,China)
出处
《合肥工业大学学报（自然科学版）》
CAS
北大核心
2018年第6期838-844,共7页
Journal of Hefei University of Technology：Natural Science
基金
国家自然科学基金资助项目(41602256
41772250)
安徽省国土资源科技资助项目(2016-k-11)
关键词
固态碳源
硝酸盐污染
反硝化细菌
反硝化作用
三氮
solid carbon source
nitratepollution
denitrifying bacteria
benitrification
three nitrogen
