Evaluation of sampling methods for monitoring effluent phosphorus for on-site wastewater treatment systems
Evaluation of sampling methods for monitoring effluent phosphorus for on-site wastewater treatment systems
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DOI：
10.2166/wst.2012.107
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发表时间：
2012-01-01
影响因子：
2.7
通讯作者：
Krogstad, Tore
中科院分区：
文献类型：
--
作者：
Johannessen, Erik;Eikum, Arild Schanke;Krogstad, Tore
挪威莫尔萨流域有1，600多个预制现场废水处理厂正在运营。截至2010年，对这些工厂的性能进行了监测。讨论了污水处理厂的采样方法，并对不同的采样方法进行了比较。该研究包括六个不同的工厂模型，其中所有的预制包装厂。调查的参数是总磷（总P），正磷酸盐（PO 4-P）和悬浮固体（SS）。日变化曲线显示没有明显的重复变化超过24小时的时间间隔，表明良好的均衡和稳健的设计，以补偿高度可变的负载。抓取样本和时间比例复合样本的比较显示几乎相同的平均值，配对双尾学生t检验表明两种采样方法之间没有统计学显著差异。结果表明，无论采用何种抽样方法，都应预期得到相同的结果，而且，由于复合抽样的成本要高得多，因此建议在评估大量工厂时采用抓取抽样。
More than 1,600 prefabricated on-site wastewater treatment plants are in operation in the Morsa watershed in Norway. As of 2010 a monitoring program on the performance of these plants is in effect. Sampling methods for wastewater treatment plants is discussed, and different methods are compared. The study includes six different plant models, of which all are prefabricated package plants. The parameters investigated were total phosphorus (Tot-P), orthophosphate (PO4-P) and suspended solids (SS). Diurnal curves showed no apparent repetitive variation over 24 h intervals, indicating good equalization and robust design to compensate for highly variable loadings. A comparison of grab samples and time proportional composite samples showed almost identical average values, and a paired two-tailed Student's t-test indicates no statistically significant difference between the sampling methods. The results indicate that equivalent results should be expected irrespective of sampling method, and, as composite sampling is attributed to much higher costs, it is recommended that grab sampling should be used when a large number of plants are evaluated.