Re-configuring mainstream anammox

Wang, Zhiyao; Zheng, Min; Duan, Haoran; Hu, Shihu; Yuan, Zhiguo

doi:10.1016/j.cej.2022.136817

Cited by 8 publications

(3 citation statements)

References 46 publications

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“…A few recent studies reported conceptual models of mainstream deammonification such as a three-stage deammonification process (partial nitritation/anammox reactor, acidic nitritation reactor, and anammox reactor) by implementing upstream C removal using high-rate activated sludge system prior to partial nitritation/anammox reactor in the mainstream. The acidic nitritation reactor is to serve efficient nitrite (NO 2 -N) production for the downstream anammox reactor ( Cao et al, 2022 ; Wang et al, 2022 ). These concepts targeted the mainstream Anammox by integrating side stream treatment and reconfiguring the anammox reactor systems.…”

Section: Resultsmentioning

confidence: 99%

Concept development of a mainstream deammonification and comparison with conventional process in terms of energy, performance and economical construction perspectives

et al. 2023

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Deammonification for nitrogen removal in municipal wastewater in temperate and cold climate zones is currently limited to the side stream of municipal wastewater treatment plants (MWWTP). This study developed a conceptual model of a mainstream deammonification plant, designed for 30,000 P.E., considering possible solutions corresponding to the challenging mainstream conditions in Germany. In addition, the energy-saving potential, nitrogen elimination performance and construction-related costs of mainstream deammonification were compared to a conventional plant model, having a single-stage activated sludge process with upstream denitrification. The results revealed that an additional treatment step by combining chemical precipitation and ultra-fine screening is advantageous prior the mainstream deammonification. Hereby chemical oxygen demand (COD) can be reduced by 80% so that the COD:N ratio can be reduced from 12 to 2.5. Laboratory experiments testing mainstream conditions of temperature (8–20°C), pH (6–9) and COD:N ratio (1–6) showed an achievable volumetric nitrogen removal rate (VNRR) of at least 50 gN/(m3∙d) for various deammonifying sludges from side stream deammonification systems in the state of North Rhine-Westphalia, Germany, where m3 denotes reactor volume. Assuming a retained Norganic content of 0.0035 kgNorg./(P.E.∙d) from the daily loads of N at carbon removal stage and a VNRR of 50 gN/(m3∙d) under mainstream conditions, a resident-specific reactor volume of 0.115 m3/(P.E.) is required for mainstream deammonification. This is in the same order of magnitude as the conventional activated sludge process, i.e., 0.173 m3/(P.E.) for an MWWTP of size class of 4. The conventional plant model yielded a total specific electricity demand of 35 kWh/(P.E.∙a) for the operation of the whole MWWTP and an energy recovery potential of 15.8 kWh/(P.E.∙a) through anaerobic digestion. In contrast, the developed mainstream deammonification model plant would require only a 21.5 kWh/(P.E.∙a) energy demand and result in 24 kWh/(P.E.∙a) energy recovery potential, enabling the mainstream deammonification model plant to be self-sufficient. The retrofitting costs for the implementation of mainstream deammonification in existing conventional MWWTPs are nearly negligible as the existing units like activated sludge reactors, aerators and monitoring technology are reusable. However, the mainstream deammonification must meet the performance requirement of VNRR of about 50 gN/(m3∙d) in this case.

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Section: Resultsmentioning

confidence: 99%

Concept development of a mainstream deammonification and comparison with conventional process in terms of energy, performance and economical construction perspectives

et al. 2023

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“…NOB are typically sensitive to acid stress (see above), which has inspired attempts to develop efficient nitrification at low pH using acid-tolerant AOB [ 37 ]. Acid-tolerant AOB can provide a stable source of nitrite for anammox bacteria, while suppressing the activity of NOB at low pH [ 37 , 141 ]. This coupling of acidic nitrification with anammox is a highly promising technology that has been demonstrated in both lab-scale [ 37 , 57 , 142 , 143 ] and pilot-scale reactors [ 144 ].…”

Section: Applications and Implicationsmentioning

confidence: 99%

“…This coupling of acidic nitrification with anammox is a highly promising technology that has been demonstrated in both lab-scale [ 37 , 57 , 142 , 143 ] and pilot-scale reactors [ 144 ]. It can save significant aeration costs, eliminate the need for organic carbon, and allow for the separation and use of digested sludge in bioenergy recovery [ 141 , 145 ]. This technology has the potential to transform sewage treatment from an energy-negative to an energy-neutral service for wastewater treatment plants [ 139 , 146 , 147 ].…”

Section: Applications and Implicationsmentioning

confidence: 99%

Nitrification in acidic and alkaline environments

Leung

Daebeler

et al. 2023

Essays in Biochemistry

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Aerobic nitrification is a key process in the global nitrogen cycle mediated by microorganisms. While nitrification has primarily been studied in near-neutral environments, this process occurs at a wide range of pH values, spanning ecosystems from acidic soils to soda lakes. Aerobic nitrification primarily occurs through the activities of ammonia-oxidising bacteria and archaea, nitrite-oxidising bacteria, and complete ammonia-oxidising (comammox) bacteria adapted to these environments. Here, we review the literature and identify knowledge gaps on the metabolic diversity, ecological distribution, and physiological adaptations of nitrifying microorganisms in acidic and alkaline environments. We emphasise that nitrifying microorganisms depend on a suite of physiological adaptations to maintain pH homeostasis, acquire energy and carbon sources, detoxify reactive nitrogen species, and generate a membrane potential at pH extremes. We also recognize the broader implications of their activities primarily in acidic environments, with a focus on agricultural productivity and nitrous oxide emissions, as well as promising applications in treating municipal wastewater.

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New perspectives in free nitrous acid (FNA) uses for sustainable wastewater management

Zuo,

Zheng,

Liu

et al. 2023

Front. Environ. Sci. Eng.

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The biocidal effects of free nitrous acid (FNA) have found applications in multiple units in an urban wastewater system, including sewer networks, wastewater treatment processes, and sludge treatment processes. However, these applications are associated with chemical costs as both nitrite and acid are needed to produce FNA at the required levels. The recent discovery of novel acid-tolerant ammonia oxidizers offers the possibility to produce FNA from domestic wastewater, enabling the development of next-generation FNA-based technologies capable of achieving self-sustaining FNA production. In this study, we focus on the concept of in situ FNA generation facilitated by acid-tolerant ammonia oxidizers and highlight the multiple benefits it creates, after a brief review of the historical development of FNA-based technologies. We will discuss how wastewater systems can be made more energy-efficient and sustainable by leveraging the potential of acid-tolerant ammonia oxidizers.

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Re-configuring mainstream anammox

Cited by 8 publications

References 46 publications

Concept development of a mainstream deammonification and comparison with conventional process in terms of energy, performance and economical construction perspectives

Concept development of a mainstream deammonification and comparison with conventional process in terms of energy, performance and economical construction perspectives

Nitrification in acidic and alkaline environments

New perspectives in free nitrous acid (FNA) uses for sustainable wastewater management

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