School of Chemistry, Chemical and Environmental Engineering, Henan University of Technology, Zhengzhou, Henan, 450001, China.
School of Chemistry, Chemical and Environmental Engineering, Henan University of Technology, Zhengzhou, Henan, 450001, China.
Water Res. 2019 Nov 15;165:115004. doi: 10.1016/j.watres.2019.115004. Epub 2019 Aug 19.
A combined heterotrophic-sulfur-autotrophic system (CHSAS) was established to simultaneously reduce perchlorate and nitrate in water. In this system, the OH produced by the acetate heterotrophic part (H-part) could be neutralized with the H produced by the sulfur autotrophic part (S-part); thus, the pH of the final effluent could keep neutral. In addition, the S-part could further reduce the pollutants and residual carbon from the H-part to achieve a high performance. For 19.62 ± 0.30 mg/L ClO and 21.56 ± 0.83 mg/L NO-N in the influent, the operating parameters were optimal at a hydraulic retention time (HRT) of 1.0 h and an acetate concentration of 70 mg/L. The removal efficiency of ClO and NO reached 95.43% and 99.23%, without secondary pollution caused by residual organic carbon. It was also revealed that sulfur (S) disproportionation can be inhibited by shortening the HRT and reducing the acetate dosage. The dominant heterotrophic and autotrophic bacteria were Thauera and Ferritrophicum, respectively, while Chlorobaculum was related to S disproportionation.
建立了一种混合异养-硫自养系统（CHSAS），以同时还原水中的高氯酸盐和硝酸盐。在该系统中，乙酸盐异养部分（H 部分）产生的 OH 可与硫自养部分（S 部分）产生的 H 中和，从而使最终出水的 pH 值保持中性。此外，S 部分可以进一步还原 H 部分的污染物和残留碳，以实现高性能。对于进水的 19.62±0.30mg/L 的高氯酸盐和 21.56±0.83mg/L 的硝酸盐氮，在水力停留时间（HRT）为 1.0 小时和乙酸盐浓度为 70mg/L 的条件下，操作参数最佳。ClO 和 NO 的去除效率分别达到 95.43%和 99.23%，没有由于残留有机碳而引起的二次污染。研究还表明，通过缩短 HRT 和减少乙酸盐用量，可以抑制硫歧化。优势异养菌和自养菌分别为陶厄氏菌和亚铁铁氧化菌，而硫歧化与绿菌属有关。
