Nano manganese dioxide coupling carbon source preloading granular activated carbon biofilter enhancing biofilm formation and pollutant removal.
Nano manganese dioxide coupling carbon source preloading granular activated carbon biofilter enhancing biofilm formation and pollutant removal.
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DOI：
10.1016/j.envres.2023.117606
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发表时间：
2023-11
影响因子：
8.3
通讯作者：
Wen Qin;Qiurong Xiao;Miaoqing Hong;Jingru Yang;Yangsuk Song;Jun Ma
中科院分区：
文献类型：
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作者：
Wen Qin;Qiurong Xiao;Miaoqing Hong;Jingru Yang;Yangsuk Song;Jun Ma
稳定成熟的生物膜的形成影响生物活性碳(BAC)对氨氮的高效稳定去除。在本研究中，新型颗粒活性碳(GAC)在使用前预先负载了碳源(葡萄糖和蔗糖)和纳米二氧化锰(NMnO2)。然后进行试验，确定基质预负荷是否促进了氨氮的去除。NMnO2与负载蔗糖的生物炭联用对氨氮的去除效果达到49.1±2.5%，是非负载生物炭的1.7倍(28.2±1.9%)。培养第7天，生物量达到5.83×106~1.22×107cell/gDW GAC，是非负载组(1.28×106cell/gDW GAC)的4.6~9.5倍。负载蔗糖的生物炭表面的胞外聚合物(即蛋白质)的数量显著增加，黄杆菌(0.7%~11%)、伯克霍尔德雷亚科(13%~20%)和水生细菌(30%~67%)是载糖生物炭上的优势功能菌，有利于硝化或反硝化过程。结果表明，负载nMnO2和/或碳源加速了生物炭生物膜的形成和去除氨氮。此外，nMnO2与负载蔗糖的生物炭耦合处理对氨氮的去除是由微生物降解(56.0%±22.5%)、生物膜吸附(38.7%±22.1%)和颗粒炭吸附(5.3%±60.3%)共同贡献的，表明微生物的降解作用占主导地位。
The formation of stable and mature biofilms affects the efficient and stable removal of ammonium by biological activated carbon (BAC). In this study, the new granular activated carbon (GAC) was preloaded with the carbon source (glucose and sucrose) and nano manganese dioxide (nMnO2) before using. Then tests were performed to determine whether substrate preloading promoted ammonium removal. The ammonium removal treated by nMnO2coupled with sucrose-loaded BAC reached 49.1 ± 2.5%, which was 1.7 times higher than that by the nonloaded BAC 28.2 ± 1.9%). The biomass on the substrate-loaded BAC reached 5.83 × 106-1.22 × 107cells/g DW GAC on Day 7, which was 4.6–9.5 times higher than the value of the nonloaded BAC (1.28 × 106cells/g DW GAC). The amount of extracellular polymer (i.e., protein) on nMnO2coupled to sucrose-loaded BAC was promoted significantly.Flavobacterium(0.7%–11%),Burkholderiaceae(13%–20%) andAquabacterium(30%–67%) were the dominant functional bacteria on the substrate-loaded BAC, which were conducive to the nitrification or denitrification process. The results indicated that loading nMnO2and/or a carbon source accelerated the formation of biofilms on BAC and ammonium removal. Additionally, the ammonium removal treated by nMnO2coupled with sucrose-loaded BAC was contributed by microbial degradation (56.0 ± 2.5%), biofilm adsorption (38.7 ± 2.1%) and GAC adsorption (5.3 ± 0.3%), suggesting a major role of microbial degradation.