School of the Environment and Safety Engineering, Jiangsu University, Zhenjiang, Jiangsu 212013, China.
School of the Environment and Safety Engineering, Jiangsu University, Zhenjiang, Jiangsu 212013, China; Institute of Environmental Health and Ecological Security, Jiangsu University, Zhenjiang, Jiangsu 212013, China.
Bioresour Technol. 2021 Sep;335:125259. doi: 10.1016/j.biortech.2021.125259. Epub 2021 May 7.
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.
改性玄武岩纤维（MBF）是一种新型的废水处理生物载体，最近作为可持续材料进行了研究。本工作研究了钙改性对改性纤维（Ca-MBF）的细菌亲和性、细菌群落和氮去除性能的影响。结果表明，具有亲水性（62.66°）和正电荷（7.80 mV）表面的 Ca-MBF 促进了细菌的附着。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，当生物载体在活性污泥中培养时，具有较高的细菌活性。Ca-MBF 上的胞外聚合物物质增加了 4.35 倍，并且含有更多的蛋白质。在生物反应器中的超细载体上形成了具有独特好氧/厌氧结构的生物巢。Ca-MBF 生物反应器在使用合成生活污水进行长期处理时，总氮去除效率高于 72.2%，COD 去除效率高于 94.2%，性能比未改性载体更稳定。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增加。
