Performance and microbial population variation in a plug‐flow A<sup>2</sup>O process treating domestic wastewater with low C/N ratio

Wu, Changyong; Peng, Yongzhen; Wan, Chunli

doi:10.1002/jctb.2539

Cited by 19 publications

(9 citation statements)

References 25 publications

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“…Sometimes, the nutrient removal performance is difficult to satisfy the requirement for increasingly strict legislation. Concentrations of readily biodegradable chemical oxygen demand (COD), such as volatile fatty acids (VFAs), in wastewater strongly affect the nutrient removal efficiency [1]. Earlier researches indicated that 3-4 mg COD as acetic acid is demanded to denitrify 1 mg total nitrogen (TN) [2], and that 6-9 mg VFAs is required for biological removal of 1 mg phosphorus [3].…”

Section: Introductionmentioning

confidence: 99%

Succession of bacterial community in anaerobic–anoxic–aerobic (A2O) bioreactor using sludge fermentation liquid as carbon source

Liu

Yuan

et al. 2015

Desalination and Water Treatment

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2015) Succession of bacterial communityin anaerobic-anoxic-aerobic (A 2 O) bioreactor using sludge fermentation liquid as carbon source, Desalination and Water A B S T R A C TTo analyze the effect of sludge fermentation liquid on succession of bacterial community as carbon source, a three-month-long experiment was conducted in anaerobic-anoxic-aerobic process at room temperature. Experimental results showed that the removal efficiencies of total nitrogen and total phosphorus were improved to 84.7 and 94.3% from 64.5 and 54.2% at flow ratio of fermentation liquid and municipal wastewater, 1:35. Meanwhile, the principal component analysis demonstrated that significant shifts of bacterial community were observed with fermentation liquid addition. In particular, fermentation liquid appeared to be selective for the phosphorus-removal bacteria Gammaproteobacteria, denitrifying bacteria Comamonas sp., nitrogen-removal bacteria Betaproteobacteria, and denitrifying phosphate accumulating organisms Sphingobacterium, indicating simultaneous nitrification and denitrification, and denitrifying dephosphatation might be present after fermentation liquid addition.

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Section: Introductionmentioning

confidence: 99%

Succession of bacterial community in anaerobic–anoxic–aerobic (A2O) bioreactor using sludge fermentation liquid as carbon source

Liu

Yuan

et al. 2015

Desalination and Water Treatment

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“…The average removal efficiency increased to 60.5% in RunsII-III, but decreased to 50.3% in Run IV. For A 2 /O process, good TN removal performance could be obtained at the anaerobic/anoxic/oxic retention time ratio of 1:1.4:1.6 [23]. However, in this study, the ratios were 1:0.6:2.7 in Runs I-III and 1:0.75:2.9 in Run IV.…”

Section: Performance Of Nitrogen Removalmentioning

confidence: 42%

“…Thus, it can be speculated that GAOs were much richer than PAOs [23], but need to be further investigated.…”

Section: Characteristics Of Phosphorus Removalmentioning

confidence: 99%

S107 Characteristics of Nitrogen and Phosphorus Removal in Multiple Post-Denitrification Process with Different Aeration Rates

Deng¹,

Jin-song²,

Qu³

2016

JRST

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ABSTRACT:The nutrient (nitrogen and phosphorus) removal from municipal wastewater was investigated by sequencing batch reactor (SBR) with different aeration rates. The results indicated that the removal performances of nitrogen and phosphorus both increased first and then decreased with increasing aeration rates, and that the aeration rate should be controlled at 25 L.h -1 (dissolved oxygen = 2.7 mg.L -1 ) in order to achieve ideal removal efficiencies of total nitrogen (TN) and total phosphorus (TP). Aeration rate had a prominent effect on the occurrence of nitrification and denitrification (SND), and excessive aeration would weaken nitrogen removal during SND process. In contrast, excessive aeration had no effect on the release rate of the anaerobic phosphorus, and the decrease of these polyhydroxyalkanoates (PHAs) could significantly influence phosphorus uptake, which was very essential for controlling the biological phosphate removal.

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“…To prevent eutrophication, nutrient removal is necessary, and several mechanical treatment methods, such as the activated sludge (AS) process [1], the advanced anaerobic-anoxic-oxic (A 2 O) process [2], and the sequencing batch reactor (SBR) [3] were developed.…”

Section: Introductionmentioning

confidence: 99%

Improving the Effectiveness of a Nutrient Removal System Composed of Microalgae and Daphnia by an Artificial Illumination

2014

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Abstract:For determining the effect of illumination on nutrient removal in an artificial food web (AFW) system, we launched a pilot continuous-flow system. The system consisted of a storage basin, a phytoplankton growth chamber, and a zooplankton growth chamber. A 25,000 Lux AFW-light emitting diode (LED) on system and an AFW-LED off system were separately operated for 10 days. In the AFW-LED on system, the maximum chlorophyll-a concentration of the phytoplankton chamber was four times higher than that of the AFW-LED off system. With artificial nighttime illumination, the microalgae became both smaller and more nutritious; the microalgae became high quality food for the zooplankton, Daphnia magna. Consequently, this zooplankton became more efficient at extracting nutrients and grew more densely than in the AFW-LED off system condition. In the LED-on condition, the amounts of total nitrogen (TN) and total phosphorus (TP) flowing into the system for 10 days were 84.7 g and 20.4 g, and the amounts flowing out were 19.5 g (23%) and 4.0 g (20%), respectively. In contrast, in the LED-off condition, 83.8 g and 20.6 g of TN and TP flowed into the system while 38.8 g (46%) and 6.8 g (33%) flowed out, respectively. Artificial illumination significantly improves the removal rate of nutrients in an AFW system.

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Performance and microbial population variation in a plug‐flow A²O process treating domestic wastewater with low C/N ratio

Cited by 19 publications

References 25 publications

Succession of bacterial community in anaerobic–anoxic–aerobic (A2O) bioreactor using sludge fermentation liquid as carbon source

Succession of bacterial community in anaerobic–anoxic–aerobic (A2O) bioreactor using sludge fermentation liquid as carbon source

S107 Characteristics of Nitrogen and Phosphorus Removal in Multiple Post-Denitrification Process with Different Aeration Rates

Improving the Effectiveness of a Nutrient Removal System Composed of Microalgae and Daphnia by an Artificial Illumination

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Performance and microbial population variation in a plug‐flow A2O process treating domestic wastewater with low C/N ratio

Cited by 19 publications

References 25 publications

Succession of bacterial community in anaerobic–anoxic–aerobic (A2O) bioreactor using sludge fermentation liquid as carbon source

Succession of bacterial community in anaerobic–anoxic–aerobic (A2O) bioreactor using sludge fermentation liquid as carbon source

S107 Characteristics of Nitrogen and Phosphorus Removal in Multiple Post-Denitrification Process with Different Aeration Rates

Improving the Effectiveness of a Nutrient Removal System Composed of Microalgae and Daphnia by an Artificial Illumination

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Performance and microbial population variation in a plug‐flow A²O process treating domestic wastewater with low C/N ratio