流出物
反硝化
化学
废水
硝酸盐
过滤(数学)
磷
总悬浮物
制浆造纸工业
悬浮物
化学需氧量
环境化学
环境工程
氮气
环境科学
工程类
有机化学
统计
数学
作者
Xiaoyu Cheng,Hongbo Feng,Yifan Liang,Lincong Li,Yunbo Yao,Minghui Jin,Jun Li
标识
DOI:10.1016/j.scitotenv.2023.162799
摘要
A novel pilot-scale advanced treatment system combining waste products as fillers is proposed and established to enhance the removal of nitrate (NO3--N) and phosphate (PO43--P) from secondary treated effluent. The system consists of four modular filter columns, one containing iron shavings (R1), two containing loofahs (R2 and R3), and one containing plastic shavings (R4). The monthly average concentration of total nitrogen (TN) and total phosphorus (TP) decreased from 8.87 to 2.52 mg/L and 0.607 to 0.299 mg/L, respectively. Micro-electrolysis of iron shavings produces Fe2+ and Fe3+ to remove PO43--P, while oxygen (O2) consumption creates anoxic conditions for subsequent denitrification. Gallionellaceae, iron-autotrophic Microorganisms, enriched the surface of iron shavings. The loofah served as a carbon source to remove NO3--N, and its porous mesh structure facilitated the attachment of biofilm. The plastic shavings intercepted suspended solids and degraded excess carbon sources. This system can be scaled up and installed at wastewater plants to improve the water quality of effluent cost-effectively.
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