Odor Control >> Problems With Plumbing Smells

Evaluation of Odors from Sewer Pipes On-Line TRS Analyzer An on-line TRS analyzer was installed at a manhole in each study site. The head space gas of each manhole was collected once every five min and was fed into the TRS analyzer. The TRS analyzer thermally oxidizes reduced sulfur compounds in a sample gas to SO2, Problems With Plumbing Smells which is subsequently quantified with an optical sensor [18].

Before each on-line TRS analyzer was installed, it was calibrated with standard H2S gas. In addition, Problems With Plumbing Smells the instrument was regularly maintained to ensure accurate measurements. The R2of the calibration curves was always higher than 0.9996 in the range 0 to 1,000 ppb (Figure 2). The TRS analyzers were operated for a week before and after the treatment at each site.

Example calibration curve for on-line TRS analyzer against standard H2S gas.In order to confirm the major odorous compounds from sewer systems, two or three gas samples were collected from the inside of a manhole located in each study sites, Problems With Plumbing Smells except District-FIVE, and were analyzed 1 to 2 months before the deodorant evaluation study was initiated. 

In fact, it was found that sulfur compounds were the major odorants. The TRS concentration measured by the TRS analyzer on-site and odor dilution of the samples collected from the sites showed a good linear correlation (Figure 3). Therefore, Problems With Plumbing Smells it was confirmed that the on-line TRS analyzer could be used as a tool to monitor the odor emissions from sewer systems and to evaluate the efficiency of any odor reducing technology.

Odor dilution vs. TRS concentration from the sewers in the study sites.2.3.2.Measurement of Odor and Individual Odorants In general, sampling and analysis of odorous gases were performed following the Korean Odor Measurement and Analysis Methods [19,20]. Brief explanations of the Problems With Plumbing Smells sample collection and analysis methods are provided below. 

Collection, Transportation and Storage of Samples The gas samples were taken from the monitoring site of each district (e.g., from a street inlet or a manhole located on 300to500 m downstream from the agent-spraying point) at three different times before and after the Problems With Plumbing Smells treatment. The gas samples were collected for 5 min with a diaphragm pump regulated by a flow meter and operating at 4 L·min−1using a 20 L Tedlar bag. 

Tedlar bags were cleaned three times with high purity nitrogen before use and the pump and the tubes were also cleaned by flowing high purity nitrogen through them for 3 min. After collection, samples were stored in light resistant containers, Problems With Plumbing Smells and were sent to a third party operating a certified laboratory for determining odor dilution, and to our laboratory for instrumental analysis of individual odorants. 

All the samples were analyzed within a day after collection.Determination of Odor DilutionOdors of collected gas samples were determined by a third party panel. The Problems With Plumbing Smells samples for the panel evaluation were mixed with odor-free air with the dilution factor of 3, 10, and 30 times and so on using an auto-dilution unit. The odor panel was composed of five males over 19 years old. 

All of them had passed a screening test specially designed for panel candidates. Analysis of Individual Odorants A set of gas samples were collected Problems With Plumbing Smells and analyzed for individual odorants (i.e., NH3, H2S, CH3SH, DMS, and DMDS) following the Korean Odor Measurement and Analysis Methods [19]. 

For NH3analysis, the gas in the headspace of each sewer was absorbed by an acid solution in a bottle; the gas was passed through the acid solution at 10 L·min−1for 5 min. The concentration of the absorbed NH3was quantified following the Problems With Plumbing Smells standard methods. Sulfur compounds (i.e., CH3SH, H2S, DMS, and DMDS) in a gas sample collected by a Tedlar bag were analyzed by a cold concentrated-capillary column GC-FPD method. 

In addition, the effect of odor reducing agents on the water quality of the wastewater in the sewer at each site was also evaluated by collecting water samples before and after the treatment at each site, Problems With Plumbing Smells and by measuring water temperature, pH, BOD, SS, and NH3. Go to:3. Results and Discussion Effectiveness of Agent-A in Control of Odors from Sewer

Figure 4(A) shows the TRS profiles monitored by the on-line TRS analyzer before (A1) and after (A2) Agent-A was applied at District-ONE.Time profiles of TRS measured at Districts-ONE to FOUR before and after application of Agents-(A to D). Since a few governmental office buildings are located in the area along with many restaurants Problems With Plumbing Smells and coffee shops, large amounts of wastewater are intermittently discharged from the noon to evening. 

The wastewater discharge is also identified by the on-line TRS analyzer. From Figure 4(A), intermittent releases of large amount of sulfur compounds were observed; especially the peaks often appeared from lunch time to the evening. On the other hand, Problems With Plumbing Smells low concentrations of TRS were detected from dawn till noon. 

The times when the TRS peaks were observed were identical to the pumping times for outflows from the septic tanks in the large buildings along the street,  Problems With Plumbing Smells indicating that the odor emission from the sewer was mainly due to the activity of the commercial areas. It was found that there was little difference between the TRS profiles before and after the treatment were compared. 

The daily average TRS concentrations of the site before and after the Agent-A was applied were almost the same;i.e., 370 ppb and 410 ppb for before and after the treatment, Problems With Plumbing Smells respectively. At the study site of the District-ONE, the gas samples were collected before and after the agent applied, and analyzed both for odor and individual odorants. 

The samples were collected during the day times (13:00 to 15:00). The odorous gas samples were collected three times at intervals of 20 to 40 min. In general, Problems With Plumbing Smells there was not a statistically significant difference in the odor dilutions obtained from the panel evaluation for the gas samples collected before and after the application of the Agent-A (p= 0.91). 

Although gas samples for measuring odor dilution were collected when two odor panels were noticed odor emission, still large deviations could be observed from the study (Table 2). However, Problems With Plumbing Smells it should be noted that olfactory measurement can produce large deviations, especially at lower odor dilutions [11].

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