Effect of C/N Ratio on the Removal of Nitrogen and Microbial Characteristics in the Water Saturated Denitrifying Section of a Two-Stage Constructed Rapid Infiltration System

Fang, Qinglin; Xu, Wangli; Xia, Gonghan; Pan, Zhicheng

doi:10.3390/ijerph15071469

Cited by 20 publications

(8 citation statements)

References 15 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…It was reported that NO 3 -N removal was only 7% in HFCW without carbon addition, but it increased to 70% when the COD/NO 3 -N ratio was maintained at 3.5:1 by the addition of sucrose. Similarly, in FSF CW complete NO 3 -N removal was observed when the COD/NO 3 -N ratio was between 3.5:1and 5:1, but further increase in C/N ratio did not increase the NO 3 -N removal (Chang et al 2013;Fang et al 2018). COD/NO 3 -N ratio below 2 limited the NO 3 -N removal because maximum organic matter removal took place in top layers of CW which reduced the carbon source for de-nitrification in bottom layers (Fang et al 2018) Another important parameter in CW is temperature since it affects the microbial community.…”

Section: Carbon/nitrogen Ratio and Temperaturementioning

confidence: 88%

A review on effective design processes of constructed wetlands

Shukla

Parde

Gupta

et al. 2021

Int. J. Environ. Sci. Technol.

View full text Add to dashboard Cite

Decentralized wastewater treatment has become inevitable as conventional wastewater treatment plants involve huge construction and maintenance costs. One of the most popularly used decentralized wastewater treatments is constructed wetlands. Constructed wetlands are a cost-effective and sustainable treatment method for domestic and industrial wastewater. Over the years, there has been a lot of improvement in the design and process approaches of constructed wetlands. This review paper aims to find the impacts of design processes like artificial aeration, design and flow pattern, effluent recirculation, substrate media, vegetation, and C/N ratio on the treatment performance of constructed wetlands. Based on the review, it is found that intermittent aeration along with recirculation, hybrid constructed wetlands and baffled constructed wetlands are an effective way to remove ammonia and organics from wastewater. Phosphorous removal in constructed wetlands is highly dependent on substrates rather than wetland plants. Further, the paper discusses the future scopes and challenges in terms of improving the efficiency of constructed wetlands, reuse of industrial waste as substrate, solar energy based aeration, etc., to make constructed wetlands a sustainable wastewater treatment technology.

show abstract

Section: Carbon/nitrogen Ratio and Temperaturementioning

confidence: 88%

A review on effective design processes of constructed wetlands

Shukla

Parde

Gupta

et al. 2021

Int. J. Environ. Sci. Technol.

View full text Add to dashboard Cite

show abstract

“…The main possible reason was that the inadequacy of carbon source in the denitrification section in the sublayer of the CRI system led to the weak role of denitrification effect [26], and also the transference speed of nitrate nitrogen was too fast so the time of denitrification reaction period was too short [27]. Fang et al [28] pointed out that TN removal efficiency can be improved to 75.4% after adding a postpositional waterlogged layer to coordinate the carbon nitrogen ratio.…”

Section: Nitrogen Removal Performance Of the Crimentioning

confidence: 99%

Performance and Microbial Community Analysis of a Constructed Rapid Infiltration System at Different Depths

Cheng

Xia

et al. 2020

Pol. J. Environ. Stud.

Self Cite

View full text Add to dashboard Cite

To study the removal performance of a constructed rapid infiltration (CRI) system and its microbial community characteristics, we took the demonstration project of a CRI system that has successfully operated for 15 years as an example, aiming to analyze the CRI system's removal performances for COD, NH 4 +-N, TN and TP. Meanwhile, high-throughput sequencing technology was used for the first time to study the microbial community diversity and structure in the CRI system. The results showed that the average removal efficiencies for COD and NH 4 +-N were 75.52% and 92.94%, and the average removal efficiencies for TN and TP were respectively 39.74% and 42.78%. High-throughput sequencing technology indicated that a variety of bacterial phyla were found in CRI's bacterial communities, including Bacteroidetes, Actinobacteria and Acidobacteria, among which Proteobacteria dominated. At the genus level, a spatial variation was illustrated for the diversity and structure of bacterial communities. The dominant genera on the surface layer (0 cm) of CRI were mainly Nocardioides, Sphingomonas, Bryobacter and other microorganisms that can degrade organic matter, and the dominant genera in the inside (30-120 cm) were mainly microorganisms that play an important role in removing nitrogen. This study provided a theoretical basis for the long-term operation of a CRI system.

show abstract

“…The decreasing trend of COD was observed. The decrease of NH4 + -N concentration and orthophosphate uptake corresponded to the decrease COD concentration indicated that the microorganisms had consumed the carbon source to perform microbial growth and metabolism (Fang, Xu, Xia, & Pan, 2018).…”

Section: Bnr Sludge Acclimatisationmentioning

confidence: 99%

Establishment of Biological Nitrogen Removal Process for Drinking Water Treatment in Malaysia

Wong

Ong

2020

Res Com Eng Sc Tech

View full text Add to dashboard Cite

Eutrophication arises from human activities has been recognized globally as an environmental issue. Human activities have greatly increased the input of phosphorus and nitrogen into the water bodies which place a heavy pressure on clean water resources. There are limitations in the conventional water treatment processes, where phosphorus and nitrogen could not be removed efficiently. For nitrogen removal, biological method emerges as a sustainable and economically feasible alternative in recent years. Though the biological nitrogen removal (BNR) method is widely recognized in developed countries with temperate climate, knowledge and expertise on the application of this treatment process is relatively limited in developing countries, so as Malaysia in tropical region. Thus, this research aims to provide a preliminary view on the establishment of the BNR process for drinking water treatment in the local context. A lab scale sequencing batch reactor (SBR) seeded with fish pond sludge and activated sludge in the volume ratio of 1:1 was operated for the BNR process. After four weeks of sludge cultivation, the characteristic of simultaneous nitrification-denitrification was observed. The removal of total nitrogen (TN) was found exceeding 60% and little nitrate-nitrogen (NO3̄-N) concentration was observed at the end of the process. Besides, the reduction in orthophosphate (PO43--P) concentration in a BNR system has indicated the process was able to perform nitrogen and phosphorus removal simultaneously. These findings suggest that the establishment of BNR is feasible in Malaysia.

show abstract

Effect of C/N Ratio on the Removal of Nitrogen and Microbial Characteristics in the Water Saturated Denitrifying Section of a Two-Stage Constructed Rapid Infiltration System

Cited by 20 publications

References 15 publications

A review on effective design processes of constructed wetlands

A review on effective design processes of constructed wetlands

Performance and Microbial Community Analysis of a Constructed Rapid Infiltration System at Different Depths

Establishment of Biological Nitrogen Removal Process for Drinking Water Treatment in Malaysia

Contact Info

Product

Resources

About