In this work, biomass immobilized alginate beads were amended with various ratios of starch (0-20%) and powdered activated carbon (PAC: 0-0.1%), and optimum compositions were shortlisted based on simultaneous removal of metronidazole (MNZ) and organic matter from synthetic wastewater. MNZ removal of greater than 80% was achieved for initial MNZ concentration of 1ppm in 3d with optimum PAC (0.1%) and starch (5%) ratios. The presence of additional carbon substrate (i.e., dextrose) had improved the MNZ removal efficiency. Subsequently, the experiments were conducted with alginate beads amended with 0.1% PAC (A1-C2), 5% starch (A1-S1) and combination of 0.1% PAC and 5% starch (A1-S1-C2) The MNZ removal by PAC and starch amended beads was found to follow the second-order and first-order kinetics, respectively. Compared to starch amended beads, average MNZ, organic carbon and nitrogen removal efficiencies of PAC amended beads were higher by 12%, 32% and 5%, respectively. Moreover, reusability study had shown better stability of PAC (8 cycles) compared to starch (3 cycles). When starch and PAC were added together, the removal efficiencies were better than starch but lower than PAC except in the case of ammonia removal. Among the shortlisted beads, A1-C2 was found to perform best in MNZ, TOC and ammonia removals. PAC addition improved MNZ removal efficiency and the MNZ removal rate. The involvement of both adsorption and biodegradation were established in MNZ removal in all types of beads by FTIR and LC-MS analysis, respectively. However, simultaneous and rapid removal of MNZ as along with organic carbon by adsorption paired with subsequent biodegradation demonstrate the applicability of A1-C2 for the treatment of PPCP laden wastewaters.

在这项工作中，用不同比例的淀粉（0-20%）和粉状活性炭（PAC：0-0.1%）对生物质固定化海藻酸盐珠进行了修正，并基于同时去除甲硝唑（MNZ）和有机物筛选出最佳组合物。来自合成废水的物质。对于 1 ppm 的初始 MNZ 浓度，在 3 d 内以最佳 PAC (0.1%) 和淀粉 (5%) 比率实现了大于 80% 的 MNZ 去除。额外的碳底物（即葡萄糖）的存在提高了 MNZ 去除效率。随后，使用用 0.1% PAC (A1-C2)、5% 淀粉 (A1-S1) 和 0.1% PAC 和 5% 淀粉的组合 (A1-S1-C2) 修正的藻酸盐珠进行实验。 PAC 去除 MNZ发现淀粉修饰的珠粒分别遵循二级和一级动力学。与淀粉改性珠相比，PAC 改性珠粒的平均 MNZ、有机碳和氮去除效率分别高 12%、32% 和 5%。此外，可重复使用性研究表明，与淀粉（3 个循环）相比，PAC（8 个循环）具有更好的稳定性。当淀粉和PAC一起加入时，除氨去除的情况外，去除效率优于淀粉但低于PAC。在入围的珠子中，发现 A1-C2 在 MNZ、TOC 和氨去除方面表现最好。添加PAC提高了MNZ去除效率和MNZ去除率。分别通过 FTIR 和 LC-MS 分析确定了吸附和生物降解参与所有类型珠子中 MNZ 的去除。然而，