Enhanced nitrogen removal in partial nitrification-anammox (PNA) suspended sludge system for real municipal wastewater treatment at extremely low carbon to nitrogen ratio

Wang, Hanbin; Dan, Qiongpeng; Du, Rui; Li, Jiapeng; Wang, Shuying; Li, Xiyao; Zhang, Qiong; Peng, Yongzhen

doi:10.1016/j.cej.2022.139256

Cited by 8 publications

(3 citation statements)

References 48 publications

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“…Wang et al [65]. delved into an examination of the performance of an integrated combined SND-anammox suspended sludge bioreactor for municipal wastewater treatment, particularly focusing on its efficacy at extremely low C/N ratios.…”

Section: Suspended Growthmentioning

confidence: 99%

Advances in Nitrogen-Rich Wastewater Treatment: A Comprehensive Review of Modern Technologies

Omar,

Almomani,

Qiblawey

et al. 2024

Sustainability

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Nitrogen-rich wastewater is a major environmental issue that requires proper treatment before disposal. This comprehensive overview covers biological, physical, and chemical nitrogen removal methods. Simultaneous nitrification–denitrification (SND) is most effective in saline water when utilizing both aerobic and anoxic conditions with diverse microbial populations for nitrogen removal. Coupling anammox with denitrification could increase removal rates and reduce energy demand. Suspended growth bioreactors effectively treated diverse COD/N ratios and demonstrated resilience to low C/N ratios. Moving biofilm bioreactors exhibit reduced mortality rates, enhanced sludge–liquid separation, increased treatment efficiency, and stronger biological structures. SND studies show ≥90% total nitrogen removal efficiency (%RETN) in diverse setups, with Defluviicoccus, Nitrosomonas, and Nitrospira as the main microbial communities, while anammox–denitrification achieved a %RETN of 77%. Systems using polyvinyl alcohol/sodium alginate as a growth medium showed a %RETN ≥ 75%. Air-lift reflux configurations exhibited high %RETN and %RENH4, reducing costs and minimizing sludge formation. Microwave pretreatment and high-frequency electric fields could be used to improve the %RENH4. Adsorption/ion exchange, membrane distillation, ultrafiltration, and nanofiltration exhibit promise in industrial wastewater treatment. AOPs and sulfate-based oxidants effectively eliminate nitrogen compounds from industrial wastewater. Tailoring proposed treatments for cost-effective nitrogen removal, optimizing microbial interactions, and analyzing the techno-economics of emerging technologies are crucial.

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Section: Suspended Growthmentioning

confidence: 99%

Advances in Nitrogen-Rich Wastewater Treatment: A Comprehensive Review of Modern Technologies

Omar,

Almomani,

Qiblawey

et al. 2024

Sustainability

View full text Add to dashboard Cite

show abstract

“…Anammox processes play a prominent role in the global nitrogen cycle, accounting for over 50% of nitrogen loss in marine systems and up to 35% of nitrogen loss in freshwater systems. − Recently, extensive attention has been focused on the anammox process in the field of biological wastewater treatment. , It converts ammonia and nitrite into nitrogen gas directly without oxygen or organic carbon consumption, thus providing an energy-saving and high-efficiency alternative for nitrogen removal from wastewater. , As for mainstream wastewater treatment, however, the efficient enrichment and retention of the slow-growing anammox bacteria (AnAOB) remain a worldwide challenge, and they have not been widely applied at present. Moreover, AnAOB with a long generation time are sensitive to the fluctuation of environmental conditions and influent quality. , In practice, especially in the activated sludge system treating domestic wastewater, the complex and diverse microbial communities compete for substrates with AnAOB, and fast-growing heterotrophic bacteria can outcompete and competitively exclude AnAOB …”

Section: Introductionmentioning

confidence: 99%

“…Moreover, AnAOB with a long generation time are sensitive to the fluctuation of environmental conditions and influent quality. 9,10 In practice, especially in the activated sludge system treating domestic wastewater, the complex and diverse microbial communities compete for substrates with AnAOB, and fast-growing heterotrophic bacteria can outcompete and competitively exclude AnAOB. 11 To date, several strategies for culturing and retaining AnAOB have been reported in forms such as biofilms, microbial aggregates, granules, or entrapped forms such as gel carriers.…”

Section: Introductionmentioning

confidence: 99%

Highly Enriched Anammox Bacteria with a Novel Granulation Model Regulated by Epistylis spp. in Domestic Wastewater Treatment

Dan

et al. 2023

Environ. Sci. Technol.

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Anammox granulation is an efficient solution proffered to enrich slow-growing anammox bacteria (AnAOB), but the lack of effective granulation strategies for low-strength domestic wastewater impedes its application. In this study, a novel granulation model regulated by Epistylis spp. for highly enriched AnAOB was revealed for the first time. Notably, anammox granulation was achieved within 65 d of domestic wastewater treatment. The stalks of Epistylis spp. were found to act as the skeleton of granules and provide attachment points for bacterial colonization, and the expanded biomass layer in turn provided more area for the unstalked free-swimming zooids. Additionally, Epistylis spp. exerted much less predation stress on AnAOB than on nitrifying bacteria, and AnAOB tended to grow in aggregates in the interior of granules, thus favoring the growth and retention of AnAOB. Ultimately, the relative abundance of AnAOB reached up to a maximum of 8.2% in granules (doubling time of 9.9 d) compared to 1.1% in flocs (doubling time of 23.1 d), representing the most substantial disparity between granules and flocs. Overall, our findings advance the current understanding of interactions involved in granulation between protozoa and microbial communities and offer new insight into the specific enrichment of AnAOB under the novel granulation model.

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Start-up and optimization of a one-stage partial nitrification-anammox (PN-A) process treating low ammonium concentration wastewater: experimental results and modeling investigation

Zhang

et al. 2022

Environ Sci Pollut Res

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Enhanced nitrogen removal in partial nitrification-anammox (PNA) suspended sludge system for real municipal wastewater treatment at extremely low carbon to nitrogen ratio

Cited by 8 publications

References 48 publications

Advances in Nitrogen-Rich Wastewater Treatment: A Comprehensive Review of Modern Technologies

Advances in Nitrogen-Rich Wastewater Treatment: A Comprehensive Review of Modern Technologies

Highly Enriched Anammox Bacteria with a Novel Granulation Model Regulated by Epistylis spp. in Domestic Wastewater Treatment

Start-up and optimization of a one-stage partial nitrification-anammox (PN-A) process treating low ammonium concentration wastewater: experimental results and modeling investigation

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