Slowly released carbon source from composite materials system for removing nitrate pollution in groundwater

被引:18
|
作者
Xie, Yufeng [1 ]
Zhang, Dejin [1 ,2 ]
Lou, Shuai [1 ,3 ]
He, Fei [1 ]
Yin, Lu [1 ,4 ]
机构
[1] Minist Environm Protect, Nanjing Inst Environm Sci, Nanjing 210042, Jiangsu, Peoples R China
[2] Nanjing Univ Sci & Technol, Jiangsu Key Lab Chem Pollut Control & Resources R, Sch Environm & Biol Engn, Nanjing 210094, Jiangsu, Peoples R China
[3] Jiangsu Radiat Environm Protect Consultat Ctr, Nanjing 210019, Jiangsu, Peoples R China
[4] Nanjing Univ Informat Sci & Technol, Sch Environm Sci & Engn, Nanjing 210044, Jiangsu, Peoples R China
来源
RSC ADVANCES | 2017年 / 7卷 / 17期
关键词
POSTANOXIC DENITRIFICATION; WASTE-WATER; POLYHYDROXYALKANOATES; REDUCTION; POLYMERS; LEACHATE; BACTERIA; SLUDGE;
D O I
10.1039/c6ra27639c
中图分类号
O6 [化学];
学科分类号
0703 ;
摘要
Chemoheterotrophic denitrification technologies using biopolymers as a solid carbon source and biofilm carriers have been widely trialed to remove nitrate from groundwater. Here, we use a polyhydroxyalkanoates (PHA) and cellulose blend as a slowly released carbon material, the performance of which was detected through static and dynamic experiments. In the static experiment, the carbon released from the straw, cob and bagasse was 66.95, 40.12 and 40.65 mg L-1, respectively. Results show that the straw possessed higher carbon content than the others. In the dynamic experiments, the PHA/cellulose blend exhibited excellent nitrate removal efficiency and less adverse effects in nitrite accumulation during stable operation. The nitrate nitrogen removal rate reduced from 99.80% to 73.13% as nitrate loading increased from 40 to 60 mg L-1. The microbial structure of a permeable reactive barrier (PRB) system was revealed by high-throughput sequencing analysis. Azospira, Rhizomicrobium and Acidovorax were found to be the predominant species in the PHA system after the system had stabilized. Our results highlight that the PHA/cellulose blend is an economically attractive carbon source with good denitrification performance.
引用
收藏
页码:10215 / 10220
页数:6
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