Modelling transportation and transformation of nitrogen compounds at different influent concentrations in sewer pipe

Pai, Tzu‐Yi; Shyu, Guey Shin; Chen, L.; Lo, Huang‐Mu; Chang, Dyi-Huey; Lai, Wei-Jia; Yang, Pei-Yu; Chen, C.Y.; Liao, Yi; Tseng, Shih-Chi

doi:10.1016/j.apm.2012.04.036

Cited by 16 publications

(7 citation statements)

References 22 publications

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“…The sum of NO 2 --N and NO 3 --N rapidly decreased; however, their initial concentrations were too small to evaluate the denitrification activity. Since insufficient nitrogen removal due to poor nitrification was observed in every one of our tests and -434 -agreed with previous studies for an actual sewer pipe (Pai et al, 2010) and in-lab experiments (Pai et al, 2013), we can concentrate on the removal of organic matter to estimate the oxygen balance. Nevertheless, it should also be noted that two research groups achieved significant nitrogen removal via nitrification by means of recirculating open-channel reactors in Thailand (Manandhar and Schroder, 1995;Karnchanawong and Polprasert, 1990).…”

Section: Performance Of the Purifying Pipe Systemsupporting

confidence: 87%

In-sewer Treatment System of Enhancing Self-Purification: Performance and Oxygen Balance in Pilot Tests

Shoji

Matsubara

Tamaki

et al. 2015

J. of Wat. & Envir. Tech.

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A novel sewer pipe with a double-deck structure was developed for in-sewer treatment. The upper deck is designed for the smooth transportation of wastewater, while the treatment is conducted by sponge media in the lower deck, which is intermittently exposed to wastewater and oxygen as with a trickling filter. The performance of the novel pipe was examined in the pilot-scale demonstration fed with domestic wastewater for 9 months. The indices of organic matter (BOD, COD, and SS) decreased for several hours of batch-mode recirculating tests. The removal rates ranged between 12 and 39 g-COD/(m•d) and were not significantly affected by temperature (18 -29°C) and flow rate (6 -15 m 3 /h). The estimated oxygen requirement was balanced with the intermittent oxygen supply, i.e., sum of reaeration with water flow and direct exposure without water flow. Furthermore, the performance of the novel pipe coupled with simple post-treatments was also examined. The coagulation was the most efficient: BOD was successfully decreased to below 20 mg/L by the in-sewer treatment for 3.5 h followed by the addition of 100 mg/L of polyaluminum chloride. The novel pipe, therefore, may be promising technology for both COD reduction (independent usage) and alternative secondary treatment (coupled with coagulation).

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Section: Performance Of the Purifying Pipe Systemsupporting

confidence: 87%

In-sewer Treatment System of Enhancing Self-Purification: Performance and Oxygen Balance in Pilot Tests

Shoji

Matsubara

Tamaki

et al. 2015

J. of Wat. & Envir. Tech.

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“…NH 4 + -N tended to migrate from sediment to overlying water due to their concentration difference (Liu, Yang, et al, 2021;Yu et al, 2019;Zhou et al, 2023). Under the action of various microorganisms, the transformation of nitrogen in the pipeline includes ammonization, nitrification, denitrification, and nitrogen fixation (Li et al, 2019;Pai et al, 2013;Zhao et al, 2023). Among them, the denitrification process is common due to the anoxic environment of the sewage pipeline (He et al, 2018).…”

Section: Introductionmentioning

confidence: 99%

Effects of flow rate and wastewater concentration on the transformation of nitrogen in sediment–water system of sewage pipelines

Xie,

Liu,

Zhou

et al. 2024

Water Environment Research

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In this work, the transformation law of nitrogen in sediment–water system under different flow rates and wastewater concentrations were investigated in a simulated sewage pipeline system. Results showed that the different flow rates and wastewater concentrations in the pipeline caused differences in microbial community in sediments and nitrogen transformation. When the flow rate increased from 0.05 to 0.2 m/s, the scouring effect was enhanced, resulting in higher concentrations of NH4+–N and NO3−–N in the overlying water. At 0.2 m/s, the relative abundance of Clostridium_sensu_stricto_1 in sediments was higher, resulting in a greater conversion of amino acid nitrogen (AAN) to NH4+–N. Meanwhile, many denitrifying bacteria (Trichococcus, Dechloromonas, norank_f__norank_o__Gaiellales, Thiobacillus) had high relative abundance in the sediments, and the denitrification process was common. When the wastewater concentration was high, the nitrification reaction was great in overlying and interstitial water. Moreover, the ammoniation process was great in the sediments, and the variation flux of AAN was large (remarkably reduced).Practitioner Points AAN transformed to NH4+–N in sediment under different flow rate and concentration. Scouring was enhanced at 0.2 m/s, increasing nitrogen contents in overlying water. Difference in microbial community led to more AAN conversion to NH4+–N at 0.2 m/s. The ammoniation process was greater in sediment at a high concentration of sewage. NH4+–N migrated from overlying water to sediment at a high concentration of sewage.

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“…In addition to physical migration, biological transformation by microorganisms is also common. Nitrogen could undergo ammonification, nitrification, denitrification, and other reactions under the action of microorganisms (Pai et al, 2013; Rodriguez‐Gomez et al, 2009). Phosphorus can be enriched and released through microbial metabolism and other activities (Song et al, 2019).…”

Section: Introductionmentioning

confidence: 99%

Changes in the transformation of nitrogen and phosphorus under different microbial communities in sewage pipes

Zhou,

Xie,

Tao

et al. 2024

Water Environment Research

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Microbial communities living in different environments can affect the transformation of nitrogen and phosphorus in sewage pipes. Two different environments were simulated to investigate the differences in the transformation of nitrogen and phosphorus under different microbial communities in the pipe. Results showed that the concentration of nitrogen and phosphorus changed greatly in the first 25–33 days and the first 21 days, respectively, and then remained stable. The decrease in amino acid nitrogen (AAN) concentration and the increase in ammonia nitrogen (NH4+‐N) concentration in the sediments were evident in the contrast group. The concentrations of total phosphorus (TP), dissolved total phosphorus (DTP), and dissolved reactive phosphorus (DRP) in the overlying water and interstitial water decreased, and that of TP in the sediment increased. Some microorganisms in the sediments of both groups are related to the transformation of nitrogen and phosphorus, such as Clostridium_sensu_stricto_1, Sporacetigenium, Norank_f__Anaerolineaceae, Norank_f__norank_o__PeM15, and Caldisericum. The relative abundance of these microorganisms was remarkably differed between the two groups, which partly caused the difference in nitrogen and phosphorus transformation among overlying water, interstitial water, and sediment in the two environments.Practitioner Points The concentration of N and P changed greatly in the first 20–30 days. AAN and NH4+‐N in sediments had greater concentration variation in contrast group. In two groups, TP, DTP, and DRP of water decreased, and TP of sediment increased. Microbe related to the transformation of N and P differed between the two groups.

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Modelling transportation and transformation of nitrogen compounds at different influent concentrations in sewer pipe

Cited by 16 publications

References 22 publications

In-sewer Treatment System of Enhancing Self-Purification: Performance and Oxygen Balance in Pilot Tests

In-sewer Treatment System of Enhancing Self-Purification: Performance and Oxygen Balance in Pilot Tests

Effects of flow rate and wastewater concentration on the transformation of nitrogen in sediment–water system of sewage pipelines

Changes in the transformation of nitrogen and phosphorus under different microbial communities in sewage pipes

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