Enhancement of mainstream nitrogen removal via simultaneous partial nitrification, anammox and denitrification by the gel entrapment technique

2020 ◽  
Vol 6 (3) ◽  
pp. 767-778
Author(s):  
Ming Zeng ◽  
Junfeng Yang ◽  
Xiaofang Li ◽  
Nan Wu ◽  
Peng Pan ◽  
...  
Keyword(s):  
Nitrogen Removal ◽  
Partial Nitrification ◽  
Gel Entrapment ◽  
Biofilm Carrier

A BSgel system was prepared by integrating the gel entrapment technique with a traditional biofilm carrier to realize the SNAD process under mainstream conditions.

scholarly journals Light as a Novel Inhibitor of Nitrite-Oxidizing Bacteria (NOB) for the Mainstream Partial Nitrification of Wastewater Treatment

Processes ◽  
2021 ◽  
Vol 9 (2) ◽  
pp. 346
Author(s):  
Keugtae Kim ◽  
Yong-Gyun Park
Keyword(s):  
Wastewater Treatment ◽  
Blue Light ◽  
Nitrogen Removal ◽  
Municipal Wastewater ◽  
Partial Nitrification ◽  
Biological Nutrient Removal ◽  
Nitrite Accumulation ◽  
Light Illumination ◽  
Ammonia Oxidizing Bacteria ◽  
Nitrite Oxidizing Bacteria

Conventional biological nutrient removal processes in municipal wastewater treatment plants are energy-consuming, with oxygen supply accounting for 45–75% of the energy expenditure. Many recent studies examined the implications of the anammox process in sidestream wastewater treatment to reduce energy consumption, however, the process did not successfully remove nitrogen in mainstream wastewater treatment with relatively low ammonia concentrations. In this study, blue light was applied as an inhibitor of nitrite-oxidizing bacteria (NOB) in a photo sequencing batch reactor (PSBR) containing raw wastewater. This simulated a biological nitrogen removal system for the investigation of its application potential in nitrite accumulation and nitrogen removal. It was found that blue light illumination effectively inhibited NOB rather than ammonia-oxidizing bacteria due to their different sensitivity to light, resulting in partial nitrification. It was also observed that the NOB inhibition rates were affected by other operational parameters like mixed liquor suspended solids (MLSS) concentration and sludge retention time (SRT). According to the obtained results, it was concluded that the process efficiency of partial nitrification and anammox (PN/A) could be significantly enhanced by blue light illumination with appropriate MLSS concentration and SRT conditions.

Nitrogen removal via simultaneous partial nitrification, anammox and denitrification (SNAD) process under high DO condition

2016 ◽  
Vol 27 (4-6) ◽  
pp. 195-208 ◽  
Author(s):  
Zhaoming Zheng ◽  
Jun Li ◽  
Jing Ma ◽  
Jia Du ◽  
Wei Bian ◽  
...  
Keyword(s):  
Nitrogen Removal ◽  
Partial Nitrification

A new device to select carriers for biomass immobilization and application in an aerobic/anaerobic fixed-bed sequencing batch biofilm reactor for nitrogen removal

2016 ◽  
Vol 74 (11) ◽  
pp. 2666-2674 ◽  
Author(s):  
A. Sarti ◽  
A. W. Lamon ◽  
A. Ono ◽  
E. Foresti
Keyword(s):  
Nitrogen Removal ◽  
Fixed Bed ◽  
Ammonia Concentration ◽  
Nitrogen Loading ◽  
Biofilm Reactor ◽  
New Approach ◽  
New Device ◽  
Sequencing Batch Biofilm Reactor ◽  
Biofilm Carrier ◽  
Aerobic And Anaerobic

This study proposes a new approach to selecting a biofilm carrier for immobilization using dissolved oxygen (DO) microsensors to measure the thickness of aerobic and anaerobic layers in biofilm. The biofilm carriers tested were polyurethane foam, mineral coal (MC), basaltic gravel, and low-density polyethylene. Development of layers in the biofilm carrier surface was evaluated using a flow cell device, and DO profiles were conducted to determine the size of the layers (aerobic and anaerobic). MC was the biofilm carrier selected due to allowing the development of larger aerobic and anaerobic layers in the biofilm (896 and 1,058 μm, respectively). This ability is supposed to improve simultaneous nitrogen removal by nitrification and denitrification biological processes. Thus, as a biofilm carrier, MC was used in a fixed-bed sequencing batch biofilm reactor (FB-SBBR) for treatment of wastewater with a high ammonia concentration (100–400 mgNH4+-N L−1). The FB-SBBR (15.0 L) was filled with matrices of the carrier and operated under alternating aeration and non-aeration periods of 6 h each. At a mean nitrogen loading rate of 0.55 ± 0.10 kgNH4+-N m−3 d−1, the reactor attained a mean nitrification efficiency of 95 ± 9% with nitrite as the main product (aerobic period). Mean denitrification efficiency during the anoxic period was 72 ± 13%.

scholarly journals Comparison of Clay Ceramsite and Biodegradable Polymers as Carriers in Pack-bed Biofilm Reactor for Nitrate Removal

2019 ◽  
Vol 16 (21) ◽  
pp. 4184
Author(s):  
Qian Zhang ◽  
Xue Chen ◽  
Heng Wu ◽  
Wandong Luo ◽  
Xiangyang Liu ◽  
...  
Keyword(s):  
Carbon Source ◽  
Biodegradable Polymers ◽  
Nitrogen Removal ◽  
Solid Phase ◽  
Biofilm Reactor ◽  
Attractive Alternative ◽  
Low Carbon ◽  
Conventional Process ◽  
Biofilm Carrier ◽  
Denitrification Process

In recent years, there is a trend of low C/N ratio in municipal domestic wastewater, which results in serious problems for nitrogen removal from wastewater. The addition of an external soluble carbon source has been the usual procedure to achieve denitrification. However, the disadvantage of this treatment process is the need of a closed, rather sophisticated and costly process control as well as the risk of overdosing. Solid-phase denitrification using biodegradable polymers as biofilm carrier and carbon source was considered as an attractive alternative for biological denitrification. The start-up time of the novel process using PCL (polycaprolactone) as biofilm carrier and carbon source was comparable with that of conventional process using ceramsite as biofilm carrier and acetate as carbon source. Further, the solid-phase denitrification process showed higher nitrogen removal efficiency under shorter hydraulic retention time (HRT) and low carbon to nitrogen (C/N) ratio since the biofilm was firmly attached to the clear pores on the surface of PCL carriers and in this process bacteria that could degrade PCL carriers to obtain electron donor for denitrification was found. In addition, solid-phase denitrification process had a stronger resistance of shock loading than that in conventional process. This study revealed, for the first time, that the physical properties of the biodegradable polymer played a vital role in denitrification, and the different microbial compositions of the two processes was the main reason for the different denitrification performances under low C/N ratio.

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