Aerobic Treatment in Cold-Climate Countries

Champagne, Pascale; Liu, L.; Howell, Mary

doi:10.1016/b978-0-444-63665-2.00007-2

Cited by 7 publications

(4 citation statements)

References 122 publications

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“…The higher pH level of the influent during the summer was generally attributed the strong algal activities in the wastewater stabilization ponds that would exhaust the inorganic dissolved carbon and negatively impacted the pH balance in the water. The NO 3 -N level was significantly higher during the operational period than during the start-up period, as the nitrification process was not likely as effective during the fall season due to the lower Water 2017, 9, 928 7 of 14 ambient temperature, which would slow down the activity of nitrifying bacteria [36]. Although the influent PO 4 -P concentrations were similar between seasons, more than double the amount of TP was present during the operational period compared to the start-up period indicating other forms of phosphorus were likely present.…”

Section: Discussionmentioning

confidence: 99%

Peat as Substrate for Small-Scale Constructed Wetlands Polishing Secondary Effluents from Municipal Wastewater Treatment Plant

Jin

Carlos

McConnell

et al. 2017

Water

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Abstract:With the recent development of constructed wetland technology, it has become a mainstream treatment technology for the mitigation of a variety of wastewaters. This study reports on the treatment performance and pH attenuation capacity of three different configurations of small-scale on-site surface flow constructed wetlands (SFCW): T1 (Peat + Typha latifolia), T2 (T. latifolia alone), and T3 (Peat alone) treating secondary effluent from the Amherstview Water Pollution Control Plant (WPCP) for two treatment periods (start-up period and operational period). The aim of this study was to compare the nutrients removal efficiencies between the different treatments, as well as to evaluate the effects of substrate and vegetation on the wetland system. For a hydraulic retention time of 2.5 days, the results showed that all treatment systems could attenuate the pH level during both the start-up and operational periods, while significant nutrient removal performance could only be observed during the operational period. Peat was noted to be a better SFCW substrate in promoting the removal of nitrate (NO 3 -N), total nitrogen (TN), and phosphorus. The addition of T. latifolia further enhanced NO 3 -N and TN removal efficiencies, but employing T. latifolia alone did not yield effluents that could meet the regulatory discharge limit (1.0 mg/L) for phosphorus.

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Section: Discussionmentioning

confidence: 99%

Peat as Substrate for Small-Scale Constructed Wetlands Polishing Secondary Effluents from Municipal Wastewater Treatment Plant

Jin

Carlos

McConnell

et al. 2017

Water

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“…It is indicated that the activity of denitrifying bacteria is less dependent on temperature than that of nitrifying bacteria [16]. Although the temperature around 10°C partly inhibits the reduction of nitrates, it is possible to maintain the efficiency of this process on a high level by supplying easily available organic carbon [17]. In this study, the dominant forms of nitrogen in the wastewater discharged from bioreactors were ammonia nitrogen and organic nitrogen.…”

Section: Resultsmentioning

confidence: 74%

Influence of temperature and C/N ratio on nitrifying and denitrifying bacteria of biofilters treating wastewater from de-icing airport runways

et al. 2019

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One of the key elements in the operational management of airports is effective de-icing of surfaces. The run-off of precipitation water loaded with pollutants from de-icing is a considerable and costly problem. The aim of our research has been to evaluate the applicability of biofilters filled with light expanded clay aggregate (LECA) generated from incineration of sewage sludge and now serving as a matrix for the development of microorganisms. The tested biofilters treated precipitation water polluted with agents used to de-ice airports. The solution was tested on a laboratory scale, in a range of temperatures from 0 to 25°C, and at concentrations of pollutants from airport de-icing expressed as COD and varying from 503.30 to 3827.50 mg O2·L-1. The tested filling allowed nitrifying as well as denitrifying bacteria to grow and develop even at low temperatures. Biofilters provide simultaneous nitrification and denitrification, as well as removal of organic compounds, even at 0°C. Biofilters based on the granulate prepared from fly ash from sewage sludge thermal treatment can be a cost-efficient and low-maintenance technology to treat airport surface runoff.

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“…The activity of heterotrophic denitrifying bacteria is less dependent on the temperature than that of nitrifying bacteria [27]. Kadlec and Reddy [28] reported that 20-35 • C was the optimal temperature range for denitrification, which slows down considerably at temperatures lower than 10 • C and greater than 30 • C. Champagne et al [29] noted that providing a source of readily biodegradable organic carbon helped maintain high nitrification efficiencies even at temperatures under 10 • C. In the present study, the denitrification rate increased at higher temperatures and decreased at higher C/N ratios (Figure 2; Supplementary Figures S4-S6), even though the presence of a readily available source of organic carbon is one of the main drivers of effective denitrification [30,31] . Lowering the biofilter operating temperature to 0 • C reduced the performance by 36.7% and 40.0% against the control, respectively.…”

Section: Nitrogen Removalmentioning

confidence: 99%

The Kinetics of Pollutant Removal through Biofiltration from Stormwater Containing Airport De-Icing Agents

et al. 2021

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The present study aimed to determine the kinetics of pollutant removal in biofilters with LECA filling (used as a buffer to prevent de-icing agents from being released into the environment with stormwater runoff). It demonstrated a significant effect of temperature and a C/N ratio on the rate of nitrification, denitrification, and organic compound removal. The nitrification rate was the highest (0.32 mg N/L·h) at 25 °C and C/N = 0.5, whereas the lowest (0.18 mg N/L·h) at 0 °C and C/N = 2.5 and 5.0. Though denitrification rate is mainly affected by the available quantity of organic substrate, it actually decreased as the C/N increased and was positively correlated with the temperature levels. Its value was found to be the highest (0.31 mg N/L·h) at 25 °C and C/N = 0.5, and the lowest (0.18 mg N/L·h) at 0 °C and C/N = 5.0. As the C/N increased, so did the content of organic compounds in the treated effluent. The lowest organic removal rates were noted for C/N = 0.5, ranging between 11.20 and 18.42 mg COD/L·h at 0 and 25 °C, respectively. The highest rates, ranging between 27.83 and 59.43 mg COD/L·h, were recorded for C/N = 0.5 at 0 and 25 °C, respectively.

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Aerobic Treatment in Cold-Climate Countries

Cited by 7 publications

References 122 publications

Peat as Substrate for Small-Scale Constructed Wetlands Polishing Secondary Effluents from Municipal Wastewater Treatment Plant

Peat as Substrate for Small-Scale Constructed Wetlands Polishing Secondary Effluents from Municipal Wastewater Treatment Plant

Influence of temperature and C/N ratio on nitrifying and denitrifying bacteria of biofilters treating wastewater from de-icing airport runways

The Kinetics of Pollutant Removal through Biofiltration from Stormwater Containing Airport De-Icing Agents

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