Investigation of a basic nitrification–denitrification biofiltration system for primary wastewater treatment

IF 2.4 4区 环境科学与生态学 Q2 WATER RESOURCES Water Quality Research Journal Pub Date : 2023-05-03 DOI:10.2166/wqrj.2023.103
W. Hassen, A. Ben Rejab, B. Hassen, N. Jdidi, A. Hassen
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Abstract

The study aimed to eliminate the nitrogen and its main residual forms from municipal wastewater by using a biofilter system adapted for a small community. The biological nitrification/denitrification system used involved two successive PVC columns; a first gravel column (C1) loaded with primary wastewater followed by a second sandy column (C2). A complex biofilm development on the gravel and sand materials has been confirmed by scanning electron microscope. The efficiency of chemical oxygen demand (COD), BOD5, TSS, and NH4+-N removal from primary wastewater reached 75.3, 88.4, 83.5, and 88.1%, respectively, at the exit of the sandy column (C2). Inoculation with activated sludge as an external carbon source allowed an improvement in the nitrate removal, from 80 to 28 mg/l N-NO3. However, sludge inoculation showed non-significant fecal coliforms and Streptococcus contamination, and the biofilter appeared as effective for total nitrogen removal and a bacterial abatement of over 3.2 U-log10. The average bacterial removal seemed directly related to the applied load of about 50 cm/day and a tertiary disinfection treatment, such as UV-C254 irradiation, is needed as a preventive step to ensure the removal of pathogens.
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用于污水一级处理的基本硝化-反硝化生物过滤系统研究
该研究旨在通过使用适用于小型社区的生物过滤系统,消除城市废水中的氮及其主要残留形式。所使用的生物硝化/反硝化系统涉及两个连续的PVC塔;第一个砾石柱(C1)装载初级废水,然后是第二个砂柱(C2)。通过扫描电镜观察,证实了砾石和砂石材料上存在复杂的生物膜发育。在砂柱出口(C2),化学需氧量(COD)、BOD5、TSS和NH4+-N的去除率分别达到75.3、88.4、83.5和88.1%。接种活性污泥作为外部碳源可以提高硝酸盐的去除率,从80到28 mg/l N-NO3。然而,污泥接种显示粪便大肠菌群和链球菌污染不显著,生物过滤器似乎有效去除总氮和细菌减少超过3.2 U-log10。平均细菌去除率似乎与约50 cm/天的施加负荷直接相关,并且需要三级消毒处理,如UV-C254照射,作为确保病原体去除的预防步骤。
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