2. Materials and methods
2.1. Sampling and assessment of odor
2.1.1. Design of experiment: sampling
A case study was carried out at Baranagar–Kamarhati sewagetreatment plant (Fig. 1) which falls under the purview of the KMDA(Kolkata Municipal Development Authority, Kolkata, India). The plantwas situated in Baranagar–Kamarhati Municipal town, Mathkol,near Belgachia Metro Car Shed, Baranagar, West Bengal, India (Lat:22.6438N; Long: 88.3658E). This plant receives domestic sewage fromthe population of the Kamarhati and Baranagar municipality and itspresent capacity is 40 MLD (Million Litre per Day).Samples of odorous emissions were collected from raw sewage,which was supposed to be a source having the highest levels ofmalodorous compounds. This was accomplished during the periodof May–July, 2012. A big drum was filled with the raw sewage,leaving a headspace of approximately 3900 ml, and then the lidwas tightly locked in situ using Teflon seals and tape to prevent anyloss of volatile compounds during transport to the laboratory andhandling in the laboratory before any experiments on odor controlassessment by adsorption and olfactometry. The average ambient air temperature during sampling was 39 8C. Samples were collected between 9:30 a.m. and 10:00 a.m. Upon arrival in the laboratory, the drum was weighed. Immediately after weighing,
2. Materials and methods2.1. Sampling and assessment of odor2.1.1. Design of experiment: samplingA case study was carried out at Baranagar–Kamarhati sewagetreatment plant (Fig. 1) which falls under the purview of the KMDA(Kolkata Municipal Development Authority, Kolkata, India). The plantwas situated in Baranagar–Kamarhati Municipal town, Mathkol,near Belgachia Metro Car Shed, Baranagar, West Bengal, India (Lat:22.6438N; Long: 88.3658E). This plant receives domestic sewage fromthe population of the Kamarhati and Baranagar municipality and itspresent capacity is 40 MLD (Million Litre per Day).Samples of odorous emissions were collected from raw sewage,which was supposed to be a source having the highest levels ofmalodorous compounds. This was accomplished during the periodof May–July, 2012. A big drum was filled with the raw sewage,leaving a headspace of approximately 3900 ml, and then the lidwas tightly locked in situ using Teflon seals and tape to prevent anyloss of volatile compounds during transport to the laboratory andhandling in the laboratory before any experiments on odor controlassessment by adsorption and olfactometry. The average ambient air temperature during sampling was 39 8C. Samples were collected between 9:30 a.m. and 10:00 a.m. Upon arrival in the laboratory, the drum was weighed. Immediately after weighing,
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