Nitrogen removal via nitrite in a partial nitrification sequencing batch biofilm reactor treating high strength ammonia wastewater and its greenhouse gas emission

Wei, Dong; Zhang, Keyi; Ngo, Huu Hao; Guo, Wenshan; Wang, Siyu; Li, Jibin; Han, Fang; Du, Bin; Wei, Qin

doi:10.1016/j.biortech.2017.01.033

Cited by 67 publications

(15 citation statements)

References 36 publications

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“…This can avoid the high N2O emissions in suspended growth systems transitioning from anoxic to aerobic zones (Chandran et al 2011). Recent research on N2O emissions from MBBRs are consistent with the factors described at the beginning of this section, depending on the application (Mannina et al 2018a;Mannina et al 2017;Mannina et al 2018b;Wei et al 2017).…”

Section: Figuresupporting

confidence: 77%

Nitrous oxide emissions from biofilm processes for wastewater treatment

Sabba

Terada

Wells

et al. 2018

Appl Microbiol Biotechnol

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This paper discusses the microbial basis and the latest research on nitrous oxide (NO) emissions from biofilms processes for wastewater treatment. Conditions that generally promote NO formation in biofilms include (1) low DO values, or spatial DO transitions from high to low within the biofilm; (2) DO fluctuations within biofilm due to varying bulk DO concentrations or varying substrate concentrations; (3) conditions with high reaction rates, which lead to greater formation of intermediates, e.g., hydroxylamine (NHOH) and nitrite (NO), that promote NO formation; and (4) electron donor limitation for denitrification. Formation of NO directly results from the activities of ammonia-oxidizing bacteria (AOB), ammonia-oxidizing archaea (AOA), and heterotrophic denitrifying bacteria. More research is needed on the roles of AOA, comammox, and specialized denitrifying microorganisms. In nitrifying biofilms, higher bulk ammonia (NH) concentrations, higher nitrite (NO) concentrations, lower dissolved oxygen (DO), and greater biofilm thicknesses result in higher NO emissions. In denitrifying biofilms, NO accumulates at low levels as an intermediate and at higher levels at the oxic/anoxic transition regions of the biofilms and where COD becomes limiting. NO formed in the outer regions can be consumed in the inner regions if COD penetrates sufficiently. In membrane-aerated biofilms, where nitrification takes place in the inner, aerobic biofilm region, the exterior anoxic biofilm can serve as a NO sink. Reactors that include variable aeration or air scouring, such as denitrifying filters, trickling filters, or rotating biological contactors (RBCs), can form peaks of NO emissions during or following a scouring or aeration event. NO emissions from biofilm processes depend on the microbial composition, biofilm thickness, substrate concentrations and variability, and reactor type and operation. Given the complexity and difficulty in quantifying many of these factors, it may be difficult to accurately predict emissions for full-scale treatment plants. However, a better understanding of the mechanisms and the impacts of process configurations can help minimize NO emission from biofilm processes for wastewater treatment.

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Section: Figuresupporting

confidence: 77%

Nitrous oxide emissions from biofilm processes for wastewater treatment

Sabba

Terada

Wells

et al. 2018

Appl Microbiol Biotechnol

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“…The reason might 168 be based on the fact that ammonium was converted to nitrite, which led to the increase 169 of hydrogen ion concentration. After that, the increase in pH values might be due to 170 the completion of nitrification and the stripping of carbon dioxide(Peng and Zhu, 171 2006;Wei et al, 2017). 1723.2.…”

mentioning

confidence: 99%

Characterization of soluble microbial products in a partial nitrification sequencing batch biofilm reactor treating high ammonia nitrogen wastewater

Wei

Ngo

et al. 2018

Bioresource Technology

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In present study, the characterization of soluble microbial products (SMP) was evaluated in a partial nitrification sequencing batch biofilm reactor (SBBR). During the stable operation of SBBR, the NH-N removal efficiency and nitrite accumulation ratio were 96.70±0.41% and 93.77±1.04%, respectively. According to excitation-emission matrix (EEM), the intensities of protein-like substances were reduced under anoxic and aerobic phases, whereas humic-like substances had little change during the whole cycle. Parallel factor analysis (PARAFAC) further indentified two components and their fluorescence intensity scores were both reduced. Synchronous fluorescence spectra revealed that the fluorescence intensity of protein-like fraction decreased with reaction time. Two-dimensional correlation spectroscopy (2D-COS) further demonstrated that protein-like fraction might decrease earlier than the other fractions. The information obtained in present study is of fundamental significance for understanding the key components in SMP and their changes in partial nitrification system by using a spectral approach.

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“…Zuniga and Martinez reported an efficient phosphate removal and complete nitrification using SBBR . According to Wei et al, partial nitrification was successfully achieved and maintained in an SBBR . Although fixed‐bed reactors have been shown to be capable of treating a variety of wastewaters, the real‐world applications of SBBRs are limited due to several drawbacks of the system itself.…”

Section: Membrane Biofilm Reactorsmentioning

confidence: 99%

“…37 According to Wei et al, partial nitrification was successfully achieved and maintained in an SBBR. 105 Although fixed-bed reactors have been shown to be capable of treating a variety of wastewaters, the real-world applications of SBBRs are limited due to several drawbacks of the system itself. For example, the fixed bed is easily clogged.…”

Section: Sequencing Batch Biofilm Reactor (Sbbr)mentioning

confidence: 99%

A review on the advances in nitrifying biofilm reactors and their removal rates in wastewater treatment

Chaali

Naghdi

Brar

et al. 2018

J of Chemical Tech & Biotech

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Growing demand for efficient wastewater treatment systems is spurring on the development of new technologies. Biofilm‐based reactors can be used for the treatment of a variety of wastewaters and these reactors are resistant to toxic environments. Bioreactors, such as sequencing batch biofilm and moving bed biofilm are advanced techniques to treat various types of wastewaters with diverse operating conditions. Ammonium oxidizing bacteria, nitrite oxidizing bacteria and Anammox (anaerobic ammonium oxidation) bacteria are reported to be responsible for nutrient removal. In recent decades, the performance of these systems has been studied widely and compared for a number of wastewater treatment applications. In general, they are particularly suitable for high‐rate nitrification and nitrogen removal. The efficiency of these reactors has been confirmed in the laboratory and large‐scale plants. Their efficiency depends on the surface area of the biocarrier, the filling percentage volume of biofilm carriers, organic loading and diffused aeration supply. Chemical oxygen demand removal of 50–98% was reported for <12 h hydraulic retention time, 0.2 to 6.5 mg L−1 dissolved oxygen concentration and temperature range 15–35 °C. Also, the ratio of nitrate to ammonium conversion was from 0.2 to 90 and N2 conversion was from 0 to 8.5 mg. This review studied each of these bioreactors in the removal of nutrients (nitrogen, phosphorus and oxygen) from different wastewaters and compared them to conventional treatment. The review also includes the relevant studies on laboratory and pilot‐scale bioreactors to enhance their performance and reduce their costs. © 2018 Society of Chemical Industry

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Nitrogen removal via nitrite in a partial nitrification sequencing batch biofilm reactor treating high strength ammonia wastewater and its greenhouse gas emission

Cited by 67 publications

References 36 publications

Nitrous oxide emissions from biofilm processes for wastewater treatment

Nitrous oxide emissions from biofilm processes for wastewater treatment

Characterization of soluble microbial products in a partial nitrification sequencing batch biofilm reactor treating high ammonia nitrogen wastewater

A review on the advances in nitrifying biofilm reactors and their removal rates in wastewater treatment

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