Performances and microbial characteristics of granular sludge for autotrophic nitrogen removal from synthetic and mainstream domestic sewage

Liang, Yong; Li, Dong; Qingling, Su; Zhang, Jie

doi:10.1016/j.cej.2018.01.067

Cited by 33 publications

(3 citation statements)

References 46 publications

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“…Additionally, Proteobacteria are known to secrete a substantial number of EPSs [39], which are crucial for granule formation. Chloroflexi and Bacteroidota are also common in AGS reactors [40], and they play a structural role in granule formation [41]. Their relative abundances showed some variation between the seed sludge and granular sludge samples.…”

Section: Microbial Structure Analysismentioning

confidence: 99%

Enhanced Simultaneous Nitrogen and Phosphorus Removal in a Continuous-Flow Granular Sludge System under Gradient-Controlled Hydraulic Loading

Zhao,

An,

Wan

et al. 2024

Water

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The feasibility of the aerobic granulation of activated sludge was investigated in a continuous-flow anaerobic–anoxic–oxic system under gradient-controlled hydraulic loading on the surface of a cyclone separator. Concentrated domestic sewage was used. After 80 days of operation, 80% of activated sludge in the system was in the form of granular sludge with an average particle size of 373 μm. High removal efficiency was achieved for chemical oxygen demand (94.40%), NH4+-N (99.93%), total nitrogen (89.44%), and total phosphorus (96.92%). A batch study revealed that Pseudomonas (1.34%) and Dechloromonas (1.05%) as the main denitrifying phosphorus-accumulating organisms could efficiently remove phosphorus using nitrate as an electron acceptor, which improved the utilization efficiency of carbon sources and achieved simultaneous denitrification and phosphorus removal. Overall, the study demonstrates the feasibility of enhanced denitrification and phosphorus removal in a continuous-flow granular sludge system. The sludge system enables simultaneous nitrogen and phosphorus removal under low carbon-to-nitrogen ratios.

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Section: Microbial Structure Analysismentioning

confidence: 99%

Enhanced Simultaneous Nitrogen and Phosphorus Removal in a Continuous-Flow Granular Sludge System under Gradient-Controlled Hydraulic Loading

Zhao,

An,

Wan

et al. 2024

Water

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“…To achieve N removal, partial nitritation combined with anammox (PN-anammox) has great potential because it offers significant chemical and energy savings compared with traditional nitritation and denitritation processes. [1][2][3] PN-anammox conducted in two reactors has been applied widely for the removal of N from ammonium-rich wastewater, [4][5][6][7] organic-rich, biogas effluent and low-temperature streams. 8,9 To facilitate the nitritation reaction, producing alkalinity is responsible for the main chemical costs in the combined process.…”

Section: Introductionmentioning

confidence: 99%

“…It means that traditional nitrification–denitrification is not a good method for nitrogen (N) removal because sulfate reducing bacteria (SRB) can convert sulfate to hydrogen sulfide (H 2 S) using carbon (C) source as electron acceptor and cause secondary pollution. To achieve N removal, partial nitritation combined with anammox (PN‐anammox) has great potential because it offers significant chemical and energy savings compared with traditional nitritation and denitritation processes 1–3 …”

Section: Introductionmentioning

confidence: 99%

Zeolite biofilm aeration filter plays a pre‐nitritation role in autotrophic nitrogen removal from iron oxide red wastewater

Feng

Wang

et al. 2020

J of Chemical Tech & Biotech

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BACKGROUND: The completely autotrophic nitrogen removal over nitrite (CANON) system has excellent performance in treating ammonium-rich wastewater and it depends on ammonia oxidizing bacteria (AOB) working together with anammox bacteria in a reactor. Higher ammonium nitrogen loading requires higher aeration to provide sufficient dissolved oxygen (DO) for nitritation, whereas high-strength aeration in theCANON will destroy the sludge structure and inhibit the activity of anammox bacteria. The present study uses a stable pre-nitritation system to reduce a part of nitritation and also decrease aeration intensity in the CANON. RESULTS: Continuous aeration to maintain the DO concentration between 1.5 and 4.3 mg L-1 in the CANON achieved a stable nitrogen removal rate (1.22 kg N m-3 d-1) from iron oxide red wastewater with 400-1016 mg N L-1 after 183 days of operation. Using a mixed alkalinity donor [sodium carbonate (Na 2 CO 3) and bicarbonate (NaHCO 3)] in the combined system can save ≈14.1-28.2% of the alkalinity cost compared with using NaHCO 3 only. CONCLUSIONS: A zeolite biofilm aeration filter (ZBAF) used in a pre-nitritation process can tolerate high DO concentration of ≤6.5 mg L-1 for nitritation and avoid all of the nitritation taking place in the CANON system. This can protect the sludge structure and anammox bacteria from high-strength aeration erosion.

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Study of the Operation of a Continuous Modular Bioreactor Used for Treatment of Wastewater from a Recycling Industry of by-Products from Slaughterhouses

Tonhato

Morejón

Hasan

2019

Water Air Soil Pollut

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Performances and microbial characteristics of granular sludge for autotrophic nitrogen removal from synthetic and mainstream domestic sewage

Cited by 33 publications

References 46 publications

Enhanced Simultaneous Nitrogen and Phosphorus Removal in a Continuous-Flow Granular Sludge System under Gradient-Controlled Hydraulic Loading

Enhanced Simultaneous Nitrogen and Phosphorus Removal in a Continuous-Flow Granular Sludge System under Gradient-Controlled Hydraulic Loading

Zeolite biofilm aeration filter plays a pre‐nitritation role in autotrophic nitrogen removal from iron oxide red wastewater

Study of the Operation of a Continuous Modular Bioreactor Used for Treatment of Wastewater from a Recycling Industry of by-Products from Slaughterhouses

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