Granular activated carbon as nucleus for formation of Anammox granules in an expanded granular-sludge-bed reactor

doi:10.30955/gnj.001444

Cited by 25 publications

(1 citation statement)

References 18 publications

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“…The inoculated sludge used in the experiment was obtained from a sewage treatment plant in Guilin City, China. The anammox sludge was cultivated in a pilot-scale reactor using granulated active carbon, and it appeared red (Zhang et al 2014(Zhang et al , 2015(Zhang et al , 2016a(Zhang et al , 2016b(Zhang et al , 2018a. To start the AX-MBR, 4 L of activated sludge with a mixed liquor suspended solids (MLSS) of 3,500 mg/L was used as seed sludge.…”

Section: Inoculated Sludge and Wastewatermentioning

confidence: 99%

Integration of anammox into the MBR process for main stream sewage treatment

Zhang

2021

Journal of Water Supply: Research and Technology-Aqua

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The integration of Anaerobic ammonia oxidation (anammox) into the membrane bioreactor (MBR) process (AX-MBR) is proposed in this study to reduce operating costs. The temperature was not controlled during the study. Anammox, denitrification, and nitrification were studied in the AX-MBR for 210 days. The reactor was fed with mainstream sewage from Guilin City, China. The results showed that AX-MBR could run with reduced dissolved oxygen (DO) concentration, and COD, NH4+-N, and total nitrogen removal were maintained or improved. The microbial analysis results demonstrated that the added anammox sludge could survive in the AX-MBR, but the sludge microbial diversity decreased. Nitrospira, Candidatus Kuenenia, and Nitrosomonas dominated the anammox sludge. In a word, the AX-MBR developed in this study could treat mainstream sewage with the appropriate management, and the operation costs are expected to reduce by decreasing the amount of aeration.

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Section: Inoculated Sludge and Wastewatermentioning

confidence: 99%

Integration of anammox into the MBR process for main stream sewage treatment

Zhang

2021

Journal of Water Supply: Research and Technology-Aqua

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The influence of aeration control and temperature reduction on nitrogen removal and microbial community in two anammox‐based hybrid sequencing batch biofilm reactors

Azari

Jurnalis

Denecke

2021

J of Chemical Tech & Biotech

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BACKGROUND: Two hybrid biofilm reactors, an integrated fixed-film activated sludge-sequencing batch reactor (IFAS-SBR) and a hybrid SBR with a mixture of activated sludge and granules, were used to reach enhanced nitrogen removal based on the anaerobic ammonium oxidation (anammox) process under intermittent aeration.RESULTS: IFAS-SBR reached a more stable performance after a rapid start-up period of 25 days, and it showed a more reliable performance than the other reactor. The highest nitrogen removal efficiency (NRE) was up to 99% based on NH 4 + -N concentration and 91% based on total nitrogen concentration (TIN). A nitrogen removal rate of 0.01 to 0.15 kgN m −3 d −1 was achieved throughout the operation based on the TIN. The set-point of maximum dissolved oxygen (DO) at the peak of each aeration cycle was maintained at 1.2 ± 0.1 mg L −1 . The optimum working range for daily average DO concentration was 0.2-0.7 mg L −1 . Cold temperatures caused a decline of NRE, but NRE > 50% for temperatures above 13 °C was achieved. CONCLUSIONS: Results implied a higher abundance of Candidatus brocadia species of anammox bacteria in the biofilm samples and Denitratisoma genus in the flocs. The most substantial contribution of shared taxa among all samples at class level was Betaproteobacteria and Gammaproteobacteria, and the least abundant class was Nitrospira. Overall, results implied that IFAS-SBR is a robust configuration for anammox-based nitrogen removal in sidestream, and controlled intermittent aeration could suppress nitrite oxidation and help to regain system efficiency.

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Media selection for anammox‐based polishing filters: Balancing anammox enrichment and retention with filtration function

Fofana

Peng

Huynh

et al. 2022

Water Environment Research

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Retrofitting conventional denitrification filters into partial denitrification‐anammox (PdNA)‐ or anammox (AnAOB)‐based filters will reduce the needs for external carbon addition. The success of AnAOB‐based filters depends on anammox growth and retention within such filters. Studies have overlooked the importance of media selection and its impact on AnAOB capacity, head loss progression dynamics, and shear conditions applied onto the AnAOB biofilm. The objective of this study was to evaluate viable media types (10 types) that can enhance AnAOB rates for efficient nitrogen removal in filters. Given the higher backwash requirement and lower AnAOB capacity of the conventionally used sand, expanded clay (3–5 mm) was recommended for AnAOB‐based filters in this study. Owing to its surface characteristics, expanded clay had higher AnAOB activity (304‐ vs. 104‐g NH4+‐N/m2/day) and higher AnAOB retention (43% more) than sand. Increasing the iron content of expanded clay to 37% resulted in an increase in zeta potential, which led to 56% more anammox capacity compared to expanded clay with 7% iron content. This work provides insight into the importance of media types in the growth and retention of AnAOB in filters, and this knowledge could be used as basis in the development of PdNA filters. Practitioner Points Expanded clay showed the lowest head loss buildup and most likely will result in longer runtime for full‐scale PdNA applications The highest AnAOB rates were achieved in expanded clay types and sand compared with smaller media typically used in biofiltration Expanded clay resulted in better AnAOB retention under shear, whereas sand could not withstand shear and required more frequent backwashing Expanded clay iron coating enhanced AnAOB enrichment and retention, most likely due to increased surface roughness and/or positive charge

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Granular activated carbon as nucleus for formation of Anammox granules in an expanded granular-sludge-bed reactor

Cited by 25 publications

References 18 publications

Integration of anammox into the MBR process for main stream sewage treatment

Integration of anammox into the MBR process for main stream sewage treatment

The influence of aeration control and temperature reduction on nitrogen removal and microbial community in two anammox‐based hybrid sequencing batch biofilm reactors

Media selection for anammox‐based polishing filters: Balancing anammox enrichment and retention with filtration function

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