Treatment of municipal sewage with low carbon-to-nitrogen ratio via simultaneous partial nitrification, anaerobic ammonia oxidation, and denitrification (SNAD) in a non-woven rotating biological contactor

Wang, Dong; Wang, Guowen; Yang, Fenglin; Liu, Changfa; Kong, Liang; Liu, Ying

doi:10.1016/j.chemosphere.2018.06.061

Cited by 37 publications

(9 citation statements)

References 34 publications

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“…When the DO remains constant, sufficient organic carbon sources are provided for DNB in the SNAD system with the increase in the C/N ratio, thus improving the TIN removal efficiency. However, the continued increase in organic carbon sources might inhibit AnAOB [ 29 ], leading to the decrement of the TIN removal efficiency. As shown in figure 2 b , when the C/N ratio and DO are 0.57–0.82 and 0.85–0.94 mg l −1 , respectively, the TIN removal efficiency is greater than 93.1%.…”

Section: Resultsmentioning

confidence: 99%

Optimization of nitrogen and carbon removal with simultaneous partial nitrification, anammox and denitrification in membrane bioreactor

et al. 2020

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In this study, a membrane bioreactor (MBR) was used to achieve both nitrogen and carbon removal by a simultaneous partial nitrification, anammox and denitrification (SNAD) process. During the entire experiment, the intermittent aeration (non-aerobic time : aeration time, min min −1 ) cycle was controlled by a time-controlled switch, and the aeration rate was controlled by a gas flowmeter, and the optimal operating parameters as determined by response surface methodology (RSM) were a C/N value of 1.16, a DO value of 0.84 mg l −1 and an aerobic time ( T ae ) of 15.75 min. Under these conditions, the SNAD process achieved efficient and stable nitrogen and carbon removal; the total inorganic nitrogen removal efficiency and chemical oxygen demand removal efficiency were 92.31% and 95.67%, respectively. With the formation of granular sludge, the membrane fouling rate decreased significantly from 35.0 Pa h −1 at SNAD start-up to 19.9 Pa h −1 during stable operation. Fluorescence in situ hybrid analyses confirmed the structural characteristics and the relative ratio of aerobic ammonia-oxidizing bacteria, anaerobic ammonia-oxidizing bacteria and denitrifying bacteria in the SNAD system.

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Section: Resultsmentioning

confidence: 99%

Optimization of nitrogen and carbon removal with simultaneous partial nitrification, anammox and denitrification in membrane bioreactor

et al. 2020

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“…It can be seen from the value of p that the influence of selected factors on the NnormalO3 –N removal is HRT > SA > NC. The cor total is 200.12 > 4, indicating that the model works well [42]. Based on the regression equation obtained by regression model variance analysis, the response surface of HRT, SA and NRR was made by software (figure 3).…”

Section: Resultsmentioning

confidence: 99%

Cultivating river sediments into efficient denitrifying sludge for treating municipal wastewater

Hou

Zheng

et al. 2019

R. Soc. open sci.

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The river sediment contains a lot of pollutants in many cases, and needs to be treated appropriately for the restoration of water environments. In this study, a novel method was developed to convert river sediment into denitrifying sludge in a sequencing batch reactor (SBR). The river sediment was added into the reactor daily and the hydraulic retention time (HRT) of the reactor was gradually reduced from 8 to 4 h. The reactor achieved in the N O 3 – N removal efficiency of 85% with the N O 3 – N removal rate of 0.27 kg N m −3 d −1 . Response surface analysis represents that nitrate removal was affected mainly by HRT, followed by sediment addition. The denitrifying sludge achieved the highest activity with the following conditions: N O 3 – N 50 mg l −1 , HRT 6 h and adding 6 ml river sediments to 1 l wastewater of reactor per day. As a result, the cultivated denitrifying sludge could remove 80% N O 3 – N for real municipal wastewater, and the high-throughput sequence analysis indicated that major denitrifying bacteria genera and the relative abundance in the cultivated denitrifying sludge were Diaphorobacter (33.82%) and Paracoccus (24.49%). The river sediments cultivating method in this report can not only obtain denitrifying sludge, but also make use of sediment resources, which has great application potential.

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“…A non-woven RBC evaluated for the treatment of municipal wastewater supporting both aerobic and anaerobic processes resulted in a higher TN removal efficiency. Under the optimal conditions, the removal rates of COD and TN were 83.12% and 79.13%, respectively [41]. An RBC applied for the treatment of petroleum refinery wastewater resulted in 85.76% and 99.07% COD and ammonium removal, respectively [26].…”

Section: Effect Of Hydraulic Retention Time On Cod Removalmentioning

confidence: 99%

Membrane Filtration as Post-Treatment of Rotating Biological Contactor for Wastewater Treatment

et al. 2021

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A rotating biological contactor (RBC) offers a low energy footprint but suffers from performance instability, making it less popular for domestic wastewater treatment. This paper presents a study on an RBC integrated with membrane technology in which membrane filtration was used as a post-treatment step (RBC–ME) to achieve enhanced biological performance. The RBC and RBC–ME systems were operated under different hydraulic retention times (HRTs) of 12, 18, 24, and 48 h, and the effects of HRT on biological performance and effluent filterability were assessed. The results show that RBC–ME demonstrates superior biological performance than the standalone RBC. The RBC–ME bioreactor achieved 87.9 ± 3.2% of chemical oxygen demand (COD), 98.9 ± 1.1% ammonium, 45.2 ± 0.7% total nitrogen (TN), and 97.9 ± 0.1% turbidity removals. A comparison of the HRTs showed that COD and TN removal efficiency was the highest at 48 h, with 92.4 ± 2.4% and 48.6 ± 1.3% removal efficiencies, respectively. The longer HRTs also lead to better RBC effluent filterability. The steady-state permeability increased respectively by 2.4%, 9.5%, and 19.1% at HRTs of 18, 24, and 48 h, compared to 12 h. Our analysis of membrane fouling shows that fouling resistance decreased at higher HRTs. Overall, RBC–ME offered a promising alternative for traditional suspended growth processes with higher microbial activity and enhanced biological performance, which is in line with the requirements of sustainable development and environment-friendly treatment.

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Treatment of municipal sewage with low carbon-to-nitrogen ratio via simultaneous partial nitrification, anaerobic ammonia oxidation, and denitrification (SNAD) in a non-woven rotating biological contactor

Cited by 37 publications

References 34 publications

Optimization of nitrogen and carbon removal with simultaneous partial nitrification, anammox and denitrification in membrane bioreactor

Optimization of nitrogen and carbon removal with simultaneous partial nitrification, anammox and denitrification in membrane bioreactor

Cultivating river sediments into efficient denitrifying sludge for treating municipal wastewater

Membrane Filtration as Post-Treatment of Rotating Biological Contactor for Wastewater Treatment

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