College of Environmental Science and Engineering, Donghua University, Shanghai 201620, China.
College of Environmental Science and Engineering, Donghua University, Shanghai 201620, China; Shanghai Institute of Pollution Control and Ecological Security, Shanghai 200092, China; State Key Laboratory of Modification of Chemical Fibers and Polymer Materials, Donghua University, Shanghai 201620, China.
Sci Total Environ. 2024 Jun 1;927:172113. doi: 10.1016/j.scitotenv.2024.172113. Epub 2024 Apr 4.
Antimony (Sb) and sulfate are two common pollutants in Sb mine drainage and Sb-containing textile wastewater. In this paper, it was found that iron‑carbon (Fe/C) enhanced Sb(V) removal from sulfate-rich wastewater by anaerobic granular sludge (AnGS). Sulfate inhibited Sb(V) removal (S + Sb, k = 0.101), while Fe/C alleviated the inhibition and increased Sb(V) removal rate by 2.3 times (Fe/C + S + Sb, k = 0.236). Fe/C could promote the removal of Sb(III), and Sb(III) content decreased significantly after 8 h. Meanwhile, Fe/C enhanced the removal of sulfate. The 3D-EEM spectrum of supernatant in Fe/C + S + Sb group (at 24 h) showed that Fe/C stimulated the production of soluble microbial products (SMP) in wastewater. SMP alleviated the inhibition of sulfate, promoting AnGS to reduce Sb(V). Sb(V) could be reduced to Sb(III) both by AnGS and sulfides produced from sulfate reduction. Further analysis of extracellular polymeric substances (EPS) and AnGS showed that Fe/C increased the adsorbed Sb(V) in EPS and the c-type cytochrome content in AnGS, which may be beneficial for Sb(V) removal. Sb(V) reduction in Fe/C + S + Sb group may be related to the genus Acinetobacter, while in Sb group, several bacteria may be involved in Sb(V) reduction, such as Acinetobacter, Pseudomonas and Corynebacterium. This study provided insights into Fe/C-enhanced Sb(V) removal from sulfate-rich wastewater.
锑（Sb）和硫酸盐是 Sb 矿排水和含 Sb 纺织废水的两种常见污染物。本文发现铁碳（Fe/C）增强了厌氧颗粒污泥（AnGS）对富硫酸盐废水中 Sb(V)的去除。硫酸盐抑制 Sb(V)的去除（S+Sb，k=0.101），而 Fe/C 缓解了抑制作用，将 Sb(V)去除率提高了 2.3 倍（Fe/C+S+Sb，k=0.236）。Fe/C 可以促进 Sb(III)的去除，并且 Sb(III)的含量在 8 小时后明显下降。同时，Fe/C 增强了硫酸盐的去除。Fe/C+S+Sb 组上清液的 3D-EEM 光谱（24 小时）表明，Fe/C 刺激了废水中可溶微生物产物（SMP）的产生。SMP 缓解了硫酸盐的抑制作用，促进了 AnGS 还原 Sb(V)。Sb(V)既可以被 AnGS 还原，也可以被硫酸盐还原产生的硫化物还原为 Sb(III)。进一步对胞外聚合物（EPS）和 AnGS 的分析表明，Fe/C 增加了 EPS 中吸附的 Sb(V)和 AnGS 中 c 型细胞色素的含量，这可能有利于 Sb(V)的去除。Fe/C+S+Sb 组中 Sb(V)的还原可能与不动杆菌属有关，而在 Sb 组中，可能有几种细菌参与了 Sb(V)的还原，如不动杆菌属、假单胞菌属和棒状杆菌属。本研究为从富硫酸盐废水中强化去除 Sb(V)提供了思路。
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