Calcium modified basalt fiber bio-carrier for wastewater treatment: Investigation on bacterial community and nitrogen removal enhancement of bio-nest.
Calcium modified basalt fiber bio-carrier for wastewater treatment: Investigation on bacterial community and nitrogen removal enhancement of bio-nest.
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DOI：
10.1016/j.biortech.2021.125259
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发表时间：
2021-05
影响因子：
11.4
通讯作者：
F. Gao;Xiangtong Zhou;Yuting Ma;Xiaoying Zhang;X. Rong;Xiang Xiao;Zhiren Wu;Jing Wei
中科院分区：
文献类型：
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作者：
F. Gao;Xiangtong Zhou;Yuting Ma;Xiaoying Zhang;X. Rong;Xiang Xiao;Zhiren Wu;Jing Wei
改性玄武岩纤维（MBF）是最近被研究作为新型废水处理生物载体的可持续材料。本工作研究了钙改性对改性纤维（Ca-MBF）的细菌亲和力、细菌群落和脱氮性能的影响。结果表明，Ca-MBF 具有亲水性 (62.66°) 和带正电 (7.80 mV) 的表面，可加速细菌附着。改性后Ca-MBF上的挥发性悬浮固体（5.46 g VSS/g纤维）增加了2.61倍，在活性污泥中培养生物载体时具有较高的细菌活性。 Ca-MBF上的细胞外聚合物含量高出4.35倍，并且含有更多的蛋白质。在生物反应器的超细载体上形成具有独特好氧/厌氧结构的生物巢。在长期处理合成生活废水中，Ca-MBF生物反应器的总氮去除率高于72.2%，COD去除率高于94.2%，比未改性载体性能更稳定。16S rRNA基因测序显示Ca-MBF生物巢中硝化和反硝化细菌的丰度有所增加。
Modified basalt fiber (MBF) is a sustainable material studied as novel wastewater treatment bio-carrier recently. This work studied the effects of calcium modification on the bacterial affinity of modified fiber (Ca-MBF), bacterial community, and nitrogen removal performance. Results showed that Ca-MBF with hydrophilic (62.66°) and positively-charged (7.80 mV) surface accelerated bacterial attachment. Volatile suspended solids on Ca-MBF (5.46 g VSS/g fiber) were increased by 2.61 times after modification, with high bacterial activity when bio-carriers were cultured in activated sludge. Extracellular polymeric substances on Ca-MBF was 4.35 times higher and consisted of more protein. Bio-nests with unique aerobic/anaerobic structure formed on the ultrafine carriers in bioreactor. Ca-MBF bioreactor exhibited total nitrogen removal efficiency above 72.2% and COD removal efficiency above 94.2% with more stable performance than unmodified carrier in long-term treatment using synthetic domestic wastewater.16S rRNA gene sequencing revealed enhanced abundance of nitrifying and denitrifying bacteria in Ca-MBF bio-nest.