The aim of present study is to assess the seasonal effects during five different seasons on endotoxins levels at various sections (aeration tank, sludge bed, grit chamber and final settlement tank) of a sewage treatment plant. Samples for endotoxins were collected using a three-stage cascade impactor. The sampler collects particulate matters in three different sizes, viz. PM1, PM2.5 and PM10. We mainly focused on the detection of endotoxins associated with the coarse particles (PM 10-2.5 ) and fine particles (PM 2.5-1.0 ). ANOVA was employed to understand whether the difference in airborne endotoxins concentrations (EU/m 3 ) was significant at p < 0.05 in different sections and during different seasons. The endotoxin concentration was found highest (125.67 ± 7.89 EU/m 3 ) at the aeration tank in summer season and lowest (11.25 ± 2.62 EU/m 3 ) at FST during winter season in the size range of (PM 10-2.5 ), both are significant. Same trends were followed for fine particulate matter (PM 2.5-1.0 ) associated endotoxin. The endotoxin concentration was found significantly different ( p < 0.05) in summer and winter season, but no significant ( p > 0.05) difference was found in monsoon and autumn seasons at all the sections.

中文翻译：

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德里污水处理厂不同部分内毒素浓度的季节性影响

本研究的目的是评估五个不同季节对污水处理厂不同部分（曝气池、污泥床、沉砂池和最终沉降池）内毒素水平的季节性影响。使用三级级联撞击器收集内毒素样品。采样器收集三种不同尺寸的颗粒物，即。PM1、PM2.5 和 PM10。我们主要关注与粗颗粒（PM 10-2.5 ）和细颗粒（PM 2.5-1.0 ）相关的内毒素检测。方差分析用于了解空气中内毒素浓度 (EU/m 3 ) 的差异是否在不同部分和不同季节的 p < 0.05 处显着。夏季曝气池内毒素浓度最高（125.67 ± 7.89 EU/m 3 ），最低（11.25 ± 2）。62 EU/m 3 ) 在冬季的 FST 大小范围内 (PM 10-2.5 )，两者都很重要。细颗粒物 (PM 2.5-1.0) 相关的内毒素也遵循相同的趋势。内毒素浓度在夏季和冬季有显着差异（ p < 0.05），但在所有断面的季风季节和秋季没有显着差异（ p > 0.05）。 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .