首页> 外文期刊>Journal of food protection >Drip Line Flushing with Chlorine May Not Be Effective in Reducing Bacterial Loads in Irrigation Water Distribution Systems
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Drip Line Flushing with Chlorine May Not Be Effective in Reducing Bacterial Loads in Irrigation Water Distribution Systems

机译:用氯冲洗滴水管线可能无法有效减少灌溉水分配系统中的细菌负荷

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摘要

Irrigation water distribution systems are used to supply water to produce crops, but the system may also provide a protected environment for the growth of human pathogens present in irrigation water. In this study, the effects of drip tape installation depth and sanitization on the microbial quality of irrigation groundwater were evaluated. Drip tape lines were installed on the soil surface or 5 or 10 cm below the soil surface. Water samples were collected from the irrigation source and the end of each drip line every 2 weeks over an 11-week period, and the levels of Escherichia coli, total coliforms, aerobic mesophilic bacteria, and enterococci were quantified. Half of the lines installed at each depth were flushed with sodium hypochlorite for 1 h during week 6 to achieve a residual of 10 ppm at the end of the line. There was a statistically significant (P = 0.01) effect of drip tape installation depth and sanitizer application on the recovery of E. coli, with increased levels measured at the 5-cm depth and in nonsanitized lines, although the levels were at the limit of detection, potentially confounding the results. There was no significant effect of drip tape depth on total coliforms, aerobic mesophiles, or enterococci. In contrast, a statistically significant increase (P < 0.01) in the recovery of total coliforms was recorded from the ends of lines that received chlorine. This may be indicative of shedding of cells owing to degradation of biofilms that formed on the inner walls of the lines. These findings emphasize the need to better understand conditions that may lead to corrosion and increases in bacterial loads inside drip lines during flushing. Recommendations to growers should suggest collecting groundwater samples for testing at the end of drip lines rather than at the source. Guidelines on flushing drip lines with chlorine may need to include water pH monitoring, a parameter that influences the corrosive properties of chlorine.
机译:灌溉用水分配系统用于供应水以生产农作物,但是该系统也可以为灌溉水中存在的人类病原体的生长提供受保护的环境。在这项研究中,评估了滴灌带安装深度和消毒对灌溉地下水微生物质量的影响。将滴灌带线安装在土壤表面或土壤表面以下5或10 cm处。在11周的时间内,每2周从灌溉源和每个滴水管线的末端收集水样,并对大肠杆菌,总大肠菌群,需氧嗜温菌和肠球菌的水平进行定量。在第6周内,将安装在每个深度的一半管线用次氯酸钠冲洗1小时,以在管线末端达到10 ppm的残留量。滴灌带安装深度和消毒剂用量对大肠杆菌的回收率具有统计学上显着(P = 0.01)的影响,在5 cm深度和未消毒的管线中测得的水平有所增加,尽管该水平处于检测,可能会混淆结果。滴水带深度对大肠菌群,有氧嗜温菌或肠球菌没有显着影响。相反,从接受氯的生产线的末端记录到总大肠菌群的回收率具有统计学上的显着提高(P <0.01)。这可能表明由于细胞系内壁上形成的生物膜降解而导致细胞脱落。这些发现强调需要更好地了解在冲洗过程中可能导致腐蚀和滴水管内细菌负荷增加的条件。给种植者的建议应该建议在滴水管线的末端而不是在源头收集地下水样品进行测试。用氯冲洗滴水管线的准则可能需要包括水pH值监测,该参数会影响氯的腐蚀性。

著录项

  • 来源
    《Journal of food protection》 |2016年第6期|1021-1025|共5页
  • 作者单位

    Department of Plant Science and Landscape Architecture, University of Maryland, College Park, Maryland 20742, USA;

    Department of Plant Science and Landscape Architecture, University of Maryland, Lower Eastern Shore Research and Education Center, Salisbury, Maryland 21801, USA;

    Department of Plant Science and Landscape Architecture, University of Maryland, Lower Eastern Shore Research and Education Center, Salisbury, Maryland 21801, USA,Department of Plant and Soil Sciences, University of Delaware, Newark, Delaware 19716, USA;

    Department of Plant Science and Landscape Architecture, University of Maryland, College Park, Maryland 20742, USA,Center for Produce Safety and Security Systems, University of Maryland, College Park, Maryland 20742, USA;

  • 收录信息 美国《科学引文索引》(SCI);美国《化学文摘》(CA);
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    Biofilms; Chlorine; Drip line maintenance; Hypochlorous acid; Produce safety; Sanitization;

    机译:生物膜;氯;滴水线维护;次氯酸;生产安全;消毒;
  • 入库时间 2022-08-17 23:24:51

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