Performance of a Full-Scale Vermifilter for Sewage Treatment in Removing Organic Matter, Nutrients, and Antibiotic-Resistant Bacteria

被引:2
作者
Gutierrez, Victor [1 ]
Monsalves, Naomi [1 ,2 ]
Gomez, Gloria [1 ,2 ]
Vidal, Gladys [1 ,2 ]
机构
[1] Univ Concepcion, Environm Sci Fac, Environm Engn & Biotechnol Grp GIBA UDEC, Concepcion 4030000, Chile
[2] ANID Fondap Ctr, Water Res Ctr Agr & Min CRHIAM, Victoria 1295, Concepcion 4030000, Chile
关键词
sewage treatment; full-scale vermifilter; antibiotic-resistant bacteria; molecular weight distribution; WASTE-WATER TREATMENT; FLOW CONSTRUCTED WETLANDS; INFLUENT C/N RATIOS; MICROBIAL COMMUNITIES; SLUDGE TREATMENT; GENES; PHARMACEUTICALS; CHLORINATION; INACTIVATION; TEMPERATURE;
D O I
10.3390/su15086842
中图分类号
X [环境科学、安全科学];
学科分类号
08 ; 0830 ;
摘要
The vermifilter (VF) is regarded as a sustainable solution for treating rural sewage. However, few studies have investigated the performance of a full-scale vermifilter. The objective of this study is to evaluate the performance of a full-scale vermifilter in reducing organic matter, nutrients, and antibiotic-resistant bacteria contained in sewage. Influent and effluents were obtained from a rural sewage treatment plant using a VF and UV disinfection system. The results show a significant removal (p < 0.05) of chemical organic demand (COD) (77%), biochemical oxygen demand (BOD5) (84%), total nitrogen (TN) (53%), and total phosphorus (36%). Seasonality is an influential variable for COD, BOD5, and TN removal. In addition, the molecular weight distribution shows that the VF does not generate a considerable change in the distribution of organic matter (COD and total organic carbon (TOC)) and NH4+-N. The UV disinfection system eliminated 99% of coliform bacteria; however, they are not eliminated to safe concentrations. Therefore, it is possible to detect bacteria resistant to the antibiotics ciprofloxacin, amoxicillin, and ceftriaxone at 63.5%, 87.3%, and 63.5%, respectively, which were detected in the effluents. This study shows the potential of a system for the removal of pollution and the need to optimize the VF to be a safe treatment.
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页数:18
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