Woodchip-sulfur based heterotrophic and autotrophic denitrification (WSHAD) process for nitrate contaminated water remediation.
Woodchip-sulfur based heterotrophic and autotrophic denitrification (WSHAD) process for nitrate contaminated water remediation.
复制标题
DOI：
10.1016/j.watres.2015.11.044
复制
发表时间：
2016-02
期刊：
影响因子：
12.8
通讯作者：
Rui Li;Chuanping Feng;Weiwu Hu;B. Xi;N. Chen;Baowei Zhao;Ying Liu;Chun-bo Hao;Jiaoyang Pu
中科院分区：
文献类型：
--
作者：
Rui Li;Chuanping Feng;Weiwu Hu;B. Xi;N. Chen;Baowei Zhao;Ying Liu;Chun-bo Hao;Jiaoyang Pu
同时异养和自养反硝化可以有效地处理硝酸盐污染水体。在本研究中，木屑和元素硫被用作共电子供体的HAD。研究发现，铵盐可以提高硫杆菌的硝化活性，硫杆菌利用木屑-硫基异养-自养反硝化（WSHAD）过程中异化硝酸盐还原为铵（DNRA）产生的铵。WSHAD工艺的反硝化性能（反应常数范围为0.05485 ~ 0.06637 h-1）优于硫基自养反硝化（反应常数范围为0.01029 ~ 0.01379 h-1），木屑与硫的最佳配比为1：1（w/w）。在WSHAD工艺中没有观察到硫酸盐的积累，并且异养反硝化中产生的碱度可以补偿硫基自养反硝化的碱度消耗。自养反硝化和异养反硝化之间的共生关系在混合营养环境中起着至关重要的作用。
Nitrate contaminated water can be effectively treated by simultaneous heterotrophic and autotrophic denitrification (HAD). In the present study, woodchips and elemental sulfur were used as co-electron donors for HAD. It was found that ammonium salts could enhance the denitrifying activity of the Thiobacillus bacteria, which utilize the ammonium that is produced by the dissimilatory nitrate reduction to ammonium (DNRA) in the woodchip-sulfur based heterotrophic and autotrophic denitrification (WSHAD) process. The denitrification performance of the WSHAD process (reaction constants range from 0.05485 h−1to 0.06637 h−1) is better than that of sulfur-based autotrophic denitrification (reaction constants range from 0.01029 h−1to 0.01379 h−1), and the optimized ratio of woodchips to sulfur is 1:1 (w/w). No sulfate accumulation is observed in the WSHAD process and the alkalinity generated in the heterotrophic denitrification can compensate for alkalinity consumption by the sulfur-based autotrophic denitrification. The symbiotic relationship between the autotrophic and the heterotrophic denitrification processes play a vital role in the mixotrophic environment.