Role of sludge retention time in mitigation of nitrous oxide emission from a pilot-scale oxidation ditch

Zhou, Nan; Dang, Chenyuan; Zhao, Zijian; He, Shishi; Zheng, Maosheng; Liu, Wen; Wang, Xiangke

doi:10.1016/j.biortech.2019.121961

Cited by 30 publications

(11 citation statements)

References 39 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…4 (c)). An increase in N 2 O concentration associated with nitrite accumulation has been reported in previous studies [4,15,35,[42][43][44]. The reduction activity of N 2 O, similarly to that of NO 2 − , is affected by the presence of oxygen [33,34], low water temperature [35], and carbon limitation [41].…”

Section: Mechanism Of N 2 O Productionsupporting

confidence: 62%

“…According to previous studies, parameters such as system configuration, operating conditions, nitrogen loading rate, dissolved oxygen (DO) concentration, carbon source, pH, water temperature [3], hydraulic retention time (HRT) [4,5], and sludge retention time (SRT) [4,6] can influence N 2 O production. In addition to these conventional water quality parameters and operating conditions, the study of the transcription levels of functional genes involved in nitrification and denitrification has become a powerful tool to elucidate the N 2 O production mechanism.…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Long-term Assessment of N<sub>2</sub>O Emission Factor in Full-scale Oxidation Ditch Reactor Considering Spatiotemporal Distribution

Otomo

Terada

et al. 2021

J. of Wat. & Envir. Tech.

View full text Add to dashboard Cite

In full-scale sewage treatment plants, long-term and high-frequency monitoring is required to mitigate nitrous oxide (N 2 O) emissions. In this study, the profile of the dissolved N 2 O concentration in a full-scale oxidation ditch reactor was investigated to determine the variation of the N 2 O emission factor. It was found that the concentration of dissolved N 2 O depended on microbial activity, which is affected by water temperature, dissolved oxygen concentration, and the dimensional relationship between the rotator and the inflow point. In the reactor, higher transcription levels of amoA mRNA and lower transcription levels of clade II type nosZ mRNA may be associated with N 2 O production. The emission factor for removed dissolved inorganic nitrogen presented a mean value of 0.86% and a median of 0.19%. When N 2 O production was promoted, gasification from the water surface was the most significant emission source, accounting for 52% of the total N 2 O emitted, on average. The N 2 O emission factor was often lower than 0.01% during stable operation; however, this factor was subject to sudden increases caused by nitrite accumulation.

show abstract

Section: Mechanism Of N 2 O Productionsupporting

confidence: 62%

Section: Introductionmentioning

confidence: 99%

Long-term Assessment of N<sub>2</sub>O Emission Factor in Full-scale Oxidation Ditch Reactor Considering Spatiotemporal Distribution

Otomo

Terada

et al. 2021

J. of Wat. & Envir. Tech.

View full text Add to dashboard Cite

show abstract

“…Significantly lower N 2 O emission factor for a pilot oxidation ditch system operated at an SRT of 25 days was reported when compared to the system with 15‐day SRT (Zhou et al., 2019). The PICRUSt (phylogenetic investigation of communities by reconstruction of unobserved states) results showed more abundant N 2 O reductase in the ditch system with higher SRT, suggesting a higher genetic potential for N 2 O reduction.…”

Section: Ghg Emissions From Wrrfsmentioning

confidence: 99%

Gaseous emissions from wastewater facilities

Koh¹,

Shaw²

2020

Water Environment Research

View full text Add to dashboard Cite

A review of the literature published in 2019 on topics relating to gaseous emissions from wastewater facilities is presented. This review is divided into the following sections: odorant emissions from Water Resource Recovery Facilities (WRRFs); greenhouse gas (GHG) emissions; gaseous emissions from wastewater collection systems; physiochemical odor/emissions control methods; biological odor/emissions control methods; odor/GHG characterization and monitoring; and odor impacts/risk assessments.

show abstract

“…To develop a deeper understanding of relationships between velocity and locations, the characteristics of the flow field in scheme (b) were analyzed, both experimentally and numerically. This is illustrated in Figure 13 by using six sections (1)(2)(3)(4)(5)(6).…”

Section: Velocity Distribution In Each Sectionmentioning

confidence: 99%

“…Therefore, they are one of the most widely used methods for activated sludge biological treatment [4]. Despite the existing research recognizes the critical role played by OD in the treatment plant's production effectiveness and economics, old and inefficient technology still prevails in many OD systems; thus, studies suggest their modernization will enhance the flow field and reduce costs and environmental impact [5][6][7][8].…”

Section: Introductionmentioning

confidence: 99%

Study on Propellers Distribution and Flow Field in the Oxidation Ditch Based on Two-Phase CFD Model

Zhang

et al. 2019

Water

View full text Add to dashboard Cite

The oxidation ditch (OD) plays an important role in wastewater treatment plants. With increasing demand and production costs, the energy consumption and sludge deposition occurring in the OD must be diminished to enhance its development. In this paper, a two-phase computational fluid dynamics (CFD) model of water and activated sludge examined the flow field characteristics of an OD, consisting of two side-by-side propellers. The system was studied under five configurations, where the spacing between the propellers was set equal to −0.2, −0.1, 0, 0.1, 0.2 times the length of the OD. The viscosity and settling rate of activated sludge was imported in the numerical simulation through a user defined function (UDF). The optimal scheme of the propeller’s power consumption, velocity distribution, and sludge concentration distribution was obtained. The result shows that sludge concentrations are linked with dead zone velocity but not necessarily with low velocities. Experiments confirmed the validity of the velocity flow field simulated by the two-phase CFD model. Overall, these findings form the basis for the propellers distribution optimization and allow a deeper insight into the flow field of OD systems.

show abstract

Role of sludge retention time in mitigation of nitrous oxide emission from a pilot-scale oxidation ditch

Cited by 30 publications

References 39 publications

Long-term Assessment of N<sub>2</sub>O Emission Factor in Full-scale Oxidation Ditch Reactor Considering Spatiotemporal Distribution

Long-term Assessment of N<sub>2</sub>O Emission Factor in Full-scale Oxidation Ditch Reactor Considering Spatiotemporal Distribution

Gaseous emissions from wastewater facilities

Study on Propellers Distribution and Flow Field in the Oxidation Ditch Based on Two-Phase CFD Model

Contact Info

Product

Resources

About