Study of operational conditions of simultaneous nitrification and denitrification in a Carrousel oxidation ditch for domestic wastewater treatment

Liu, Yanchen; Shi, Hanchang; Xia, Lan; Shi, Huiming; Shen, Tao; Wang, Zhiqiang; Wang, Gan; Wang, Yingzhe

doi:10.1016/j.biortech.2009.09.015

Cited by 140 publications

(63 citation statements)

References 20 publications

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“…The system HRT and rates of nitrification and denitrification under low DO concentrations played significant roles in SND rate. In our study, considerably high SND rate (5.09 mg L À1 h À1 ) was obtained, although 79% of SND efficiency was not very excellent due to adverse impacts of high organic loading and low C/N on TN removal [11,12,16], compared with other OD systems.…”

Section: Evaluation Of Snd By Nitrogen Mass Balancesmentioning

confidence: 89%

“…Table 6 summarizes SND performances among different types of oxidation ditches from this study and other related studies. The SND capacity depended on the efficiency and rate of SND occurrence [23], influenced by wastewater characteristics and process parameters [11,37]. From Table 6, the OD systems with very high SND efficiencies (close to 100%) might have quite slow SND rates due to very long HRTs.…”

Section: Evaluation Of Snd By Nitrogen Mass Balancesmentioning

confidence: 99%

“…To establish effective design criteria for plant optimization and retrofitting aiming at higher nitrogen removal efficiency, SND should be optimum based on premise control of oxygen by aeration adjustment [16] to reach the balance between nitrification and denitrification rates owing to their conflicts of oxygen and carbon substrates [11]. From the above comparisons, for oxidation ditches with higher organic rates and short HRT, enough oxygen intensity and tiny flocs are required for organic oxidation and then nitrification under the low-DO condition without the inhibitory effect on denitrification.…”

Section: Comparison and Optimization Of Snd In Full-scale Plantsmentioning

confidence: 99%

“…Until now, SND phenomenons have already been successfully observed in lab- [11], pilot- [11][12][13][14] and even full-scale OD systems [15][16][17]. There were some principal explanations or presumptions for nitrogen removal via SND in oxidation ditches: (1) repeatedly swift alternation is between aerobic (after aerators) and anoxic zones (before aerators) of the mixed liquor in the same aerated channel based on inhomogeneous oxygen distribution [18]; (2) low-oxygen nitrification occurs at low sludge loading rate or long HRT and SRT [14,16,17], despite its nitrification rate is generally maximum value at DO of above 2.0 mg L À1 ; (3) anoxic zones are developed inside the activated-sludge flocs under aerobic conditions [14,19]; (4) novel microbes such as aerobic denitrifiers and nitrifiers adapted to low-oxygen conditions [16,20] are capable of performing SND.…”

Section: Introductionmentioning

confidence: 99%

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Identification and evaluation of SND in a full-scale multi-channel oxidation ditch system under different aeration modes

Zhou

Han

Guo

2015

Chemical Engineering Journal

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h i g h l i g h t sSND was observed in a multi-channel OD at very low DO of 0.10-0.25 mg L À1 . SND was identified by micro-environment characteristics within tiny flocs. The highest SND occupied 44.1% of influent nitrogen mass by NMB analysis. The maximum SND efficiency was 79% with SND rate of 5.09 mg L À1 h À1 . a r t i c l e i n f o t r a c tSimultaneous nitrification and denitrification (SND) was evidently observed in a full-scale multi-channel oxidation ditch (OD), especially occurring within the outer channel under microaerophilic conditions. The optimum average dissolved oxygen (DO) concentration for SND was 0.25 mg L À1 with 79% SND efficiency and 5.09 mg L À1 h À1 SND rate, leading to 74.9% overall TN removal efficiency. Small sized flocs consisting of more nitrifying bacteria enhanced nitrification in favor of SND due to less oxygen diffusion limitation inside flocs than larger flocs under micro-aerated conditions. SND was also identified by co-existing of nitrifying and denitrifying bacteria as well as some microaerophilic microorganisms based on molecular biology analysis. Nitrogen mass balances (NMB) quantitatively demonstrated that the highest SND efficiency accounted for 44.1% of influent nitrogen mass. Above valuable findings might deeply reveal SND as a principal mechanism of nitrogen removal in a multi-channel OD from macro-to micro-scale.

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Section: Evaluation Of Snd By Nitrogen Mass Balancesmentioning

confidence: 89%

Section: Evaluation Of Snd By Nitrogen Mass Balancesmentioning

confidence: 99%

Section: Comparison and Optimization Of Snd In Full-scale Plantsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Identification and evaluation of SND in a full-scale multi-channel oxidation ditch system under different aeration modes

Zhou

Han

Guo

2015

Chemical Engineering Journal

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“…Flocs have a large size, anaerobic center and aerobic outer layers [7,8]. They are formed under the influence of specific hydraulic and oxygen regimes.…”

Section: Introductionmentioning

confidence: 99%

Energy efficient process of nitrification and denitrification in activated sludge system with low organic load

Gulshin

Gogina

2017

MATEC Web Conf.

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Abstract. The article summarizes the results of the second phase of a comprehensive study of energy efficient wastewater treatment processes in oxidation ditches. Dependence of the efficiency of simultaneous nitrification and denitrification at the change of oxygen regime have been determined at the second phase of the study. Results of the phase confirm the fundamental possibility of the withdrawal of biomass in energyefficient mode with high quality of wastewater treatment.

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Nutrient Removal from Municipal Wastewater and Microbial Community Analysis of a Combined ABR‐MBR (CAMBR) Process

Song

et al. 2013

CLEAN Soil Air Water

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In order to reduce the external nutrient loads in Lake Taihu, it is known that controlling nutrient input is the most effective way of reducing the risk of blooms. In this regard, simultaneous nitrogen and phosphorus removal by using a combined system consisting of an anaerobic baffled reactor and an aerobic membrane bioreactor for municipal wastewater treatment under the operation condition (a hydraulic retention time of 7.5 h, a recycle ratio of 200% and dissolved oxygen of 3 mg/L) was investigated. The results demonstrated that the process had a good ability to adapt to the influent shift, and was able to achieve the simultaneous nutrient removal of both two kinds of municipal wastewaters effectively with the high removal efficiencies of chemical oxygen demand, ammonium, total nitrogen, and total phosphorus more than 89, 98, 65, and 83% respectively. Analysis of fluorescence in situ hybridization showed that ammoniaoxidizing bacteria, nitrite-oxidizing bacteria, and phosphorus accumulating organisms all slightly decreased may be due to the sudden drop of influent nutrient. In addition, the high sum of the three kinds of bacteria may be the underlying reason why the CAMBR process was efficient for nitrogen and phosphorus removal.

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Study of operational conditions of simultaneous nitrification and denitrification in a Carrousel oxidation ditch for domestic wastewater treatment

Cited by 140 publications

References 20 publications

Identification and evaluation of SND in a full-scale multi-channel oxidation ditch system under different aeration modes

Identification and evaluation of SND in a full-scale multi-channel oxidation ditch system under different aeration modes

Energy efficient process of nitrification and denitrification in activated sludge system with low organic load

Nutrient Removal from Municipal Wastewater and Microbial Community Analysis of a Combined ABR‐MBR (CAMBR) Process

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