School of Environmental and Municipal Engineering, Xi'an University of Architecture and Technology, Xi'an 710055, China; Shaanxi Key Laboratory of Environmental Engineering, Xi'an University of Architecture and Technology, Xi'an 710055, China.
School of Environmental and Municipal Engineering, Xi'an University of Architecture and Technology, Xi'an 710055, China; Shaanxi Key Laboratory of Environmental Engineering, Xi'an University of Architecture and Technology, Xi'an 710055, China.
Sci Total Environ. 2022 Dec 10;851(Pt 2):158175. doi: 10.1016/j.scitotenv.2022.158175. Epub 2022 Aug 19.
A biofilm reactor filled with chia seeds gum modified biochar was set up for the simultaneous removal of nitrate, cadmium and zinc from calcium-containing wastewater via denitrification and microbially-induced (calcium) carbonate precipitation. The reactor performance was studied under different conditions of pH, Cd concentration, and hydraulic retention time. The optimal removal efficiency of the reactor for NO-N, Ca, Cd, and Zn were 99.98, 79.89, 100, and 99.84 %, respectively. 3D-EEM indicated the aromatic compounds confirming the stability of the reactor. FTIR illustrated the presence of -OH, CaCO, C-O-C, and C-O-H indicating the precipitation and role of gum in MICP. SEM confirmed that the seed crystal induced the repeated crystallization of free metal ions. XRD showed that heavy metals were removed in the form of CaCO, CdCO, ZnCO, Ca(PO), Cd(PO), and Zn(PO) co-crystallization. SEM-EDS showed the composition and distribution of elements. High-throughput sequencing showed that Curpriavidus sp. GMF1 and Ochrobactrum sp. GMC12 were the dominant bacterial species, with powerful denitrification and MICP mineralization capabilities.
建立了一个填充有奇亚籽胶改性生物炭的生物膜反应器，通过反硝化和微生物诱导的（碳酸钙）沉淀，同时从含钙废水中去除硝酸盐、镉和锌。研究了不同 pH 值、Cd 浓度和水力停留时间条件下反应器的性能。该反应器对 NO-N、Ca、Cd 和 Zn 的最佳去除效率分别为 99.98%、79.89%、100%和 99.84%。3D-EEM 表明存在芳香族化合物，证实了反应器的稳定性。FTIR 表明存在-OH、CaCO、C-O-C 和 C-O-H，表明存在胶在 MICP 中的沉淀和作用。SEM 证实了种子晶体诱导游离金属离子的重复结晶。XRD 表明重金属以 CaCO、CdCO、ZnCO、Ca(PO)、Cd(PO)和 Zn(PO)共结晶的形式被去除。SEM-EDS 显示了元素的组成和分布。高通量测序表明，Curpriavidus sp. GMF1 和 Ochrobactrum sp. GMC12 是优势细菌种类，具有强大的反硝化和 MICP 矿化能力。
