Odor Control >> How To Get Rid Of Sewer Smells

In general, the TRS concentration was high from the noon to the evening, with several intermittent high peaks (Figure 4(D)). In fact, the shops and jewelers in the district were open late in the morning at 9:00 to 11:00; so low TRS emission could be observed in the early morning. After the shops were closed after the evening, How To Get Rid Of Sewer Smells the TRS emission decreased below 100 ppb till the morning of the next day. 

The high TRS concentration peak observed at around 22 to 23 o'clock was found to be due to the pumping of wastewater from the septic tank into the sewer in a nearby building. Regarding the effect of the Agent-D on How To Get Rid Of Sewer Smells the TRS emissions from the District-FOUR, the agent did not the one observed before. 

The average TRS value was also higher after the treatment; the average TRS was 210 ppb before the agent treatment but it increased to 415 ppb when measured after the treatment.The odor dilution and How To Get Rid Of Sewer Smells the concentration of individual odorants of the samples collected from a manhole in the District-FOUR showed the similar result as those obtained from the Districts-ONE, -TWO, and -THREE. 

H2S and How To Get Rid Of Sewer Smells mercaptans were found to be the major odorants contributing to the odor sensation of the district (Table 2). The analyses of wastewater performed after the Agent-D treatment confirmed that the addition of the agent did not have any effect on the water quality of wastewater in the sewer, either (Table 3).

Microbial organisms have been extensively applied to treat municipal wastewater, and livestock wastes, since they can effectively degrade organic matter in wastewater [24]. Microorganisms live naturally in sewer systems and they digest solids and How To Get Rid Of Sewer Smells breakdown various components. Based on the assumption that the microbes can degrade odorants in wastewater or sewage, microbial additives have been applied to sewer systems and waste treatment facilities. 

It is true that little information is available regarding the effectiveness of microbial additives in reducing odors. In their recent study, Rahmanet al.[25] evaluated the efficacy of a commercial microbial additive in reducing odors from a swine manure pit, and found no difference in terms of odor, ammonia, and H2S between treated and How To Get Rid Of Sewer Smells untreated pits. 

However, Reimerset al.[26] observed effective reduction of H2S emission in their study where a microbial agent was applied to a collection system in front of a wastewater treatment plant at a rate of 1 L additive solution per 1,000 m3 wastewater. Nonetheless, How To Get Rid Of Sewer Smells in our study both microbial additives applied to District-THREE and District-FOUR did not show any reduction in odor release, possibly because the dose was not enough to reduce the sewer odor. 

In addition, the application should last for a long period of time. Reimerset al.[26] had applied the additive for more than two years in order to reduce hydrogen level from 3.5 ppm to below 1 ppm. However, How To Get Rid Of Sewer Smells in our case, Agent-C and Agent-D had been applied to sewer systems only for a month before we evaluated their effectiveness in terms of odor, and H2S reduction.3.5.

Effectiveness of Agent-E in Control of Odors from SewerFigure 5shows the time profiles of the TRS concentration obtained at the District-FIVE before and How To Get Rid Of Sewer Smells after the Agent-E (i.e., NaOCl) was applied. This district is occupied by office-buildings, restaurants, hotels, and a convention center. Since the district is heavily populated, wastewater is continuously generated and flows into sewer. 

Therefore, sewage odor almost always could be sensed in the district.Time profiles of TRS measured at District-FIVE before and after application of Agent-E.From (Figure 5-Before), How To Get Rid Of Sewer Smells the TRS concentration observed in a manhole of the study site was much higher than those observed other sites. The TRS concentration was often over 20 ppm during a day before the Agent-E was applied. 

In fact, the District-FIVE is notorious with the sewer odor, which has been a target of the public complaints.After the NaOCl was injected (Figure 5-After), the TRS concentration was not over 10 ppm. In addition, How To Get Rid Of Sewer Smells the time when TRS emission was high reduced significantly after the chemical oxidant was injected; the total time when the TRS was over 5 ppm in the day in Figure 5was 395 min before the oxidant was applied, while it decreased to 60 min after the agent was applied.

We collected gas samples at a manhole near the site where the on-line TRS analyzer was installed before and after the oxidant was applied. The odor dilution and How To Get Rid Of Sewer Smells individual odor-causing compounds of the gas samples were analyzed (Table 2). After inserting the oxidant into the sewer of the District, the odor D/T was significantly reduced from over 6,000 to around 300 (p< 0.05), while H2S concentration was reduced from 25 ppm to 2 ppm (p< 0.01). 

In fact, How To Get Rid Of Sewer Smells OCl−can be consumed to oxidize sulfur compounds (e.g., mercaptans, disulfides,etc.) to SO42−; for example, HS−in sewage can be oxidized by OCl−(Equation (1)). Since hydrogen sulfide is the main odorant in a sewer system, transformation of sulfide by an oxidant to sulfate ion definitely contributed to reduction of odor emission in the current study:(1)

In general, How To Get Rid Of Sewer Smells microbial activities are responsible for the malodor emission from the anaerobic sewer systems. Another benefit of hypochlorite addition is disinfecting odor generating anaerobic microorganisms such as sulfate reducing bacteria. The disinfection effect of OCl−solution also must have contributed to the control of hydrogen sulfide generation from the sewer system [27].

The water quality of the wastewater seemed to be affected slightly (Table 3); the BOD and NH4+concentrations of the wastewater decreased. However, How To Get Rid Of Sewer Smells it was not confirmed the reduction of BOD and NH4+was due to the addition of the oxidant. Nonetheless, it was concluded that application of the NaOCl was effective.

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