Simultaneous carbon and nutrient removal in an airlift loop reactor under a limited filamentous bulking state

Jiang, Ming; Zhang, Yalei; Zhou, Xuefei; Su, Yimin; Zhang, Min; Zhang, Ke

doi:10.1016/j.biortech.2012.11.129

Cited by 19 publications

(8 citation statements)

References 31 publications

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“…In previous studies, Jiang et al tried to remove nutrients and carbon, simultaneously, and by using a loop airlift reactor under balking limited conditions. The results demonstrated that the reactors efficiency was 91%, 92%, 86%, and 94% for COD, NH 4 , TN, and TP, respectively (19). According to Jiang et al, simultaneous removal of nitrogen compounds and organic matter was done very well, as well and this was due to urgent need of denitrifier microorganisms to organic matter for removing nitrogen compounds during the denitrification process.…”

Section: Discussionmentioning

confidence: 98%

The Efficiency of a Novel Cycling Flow Baffled Reactor Performance for the Removal of Nitrogen and Organic Matter from Wastewater

Abbasi

Azhdarpoor

Samaei

2018

Jundishapur J Health Sci

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Background and Objectives: Nitrogen is a potential pollutant of water resources. They penetrate in water resources through insufficiently treated wastewater that is rich in nitrogen. The present study aimed at evaluating the efficiency of an anoxic/aerobic cycling reactor (AACR) with continuous flow in removing nitrogen and organic matter from wastewater. Methods: Experiments were performed using a reactor with continuous intermittent influent and effluent. In this reactor, 4 phases with aeration and mixing cycles were designed and efficiency of each phase in removing nitrogen compounds was evaluated at 600 mg/L chemical oxygen demand (COD) concentration, 40 mg/L ammonia concentration, and 18-to 30-hour hydraulic retention times (HRT). Results: Results demonstrated that all cycles had great performance in removal of COD. Average COD removal efficiencies in phases 1, 2, 3, and 4 were 93%, 96.3%, 96%, and 94%, respectively. In phase 2, removal efficiency of 98.7% was obtained at hydraulic retention time of 24 hours, COD concentration of 600 mg/L, and ammonia concentration of 40 mg/L. Conclusions: Phase 2 showed great efficiency in removal of nitrogen compounds. Combination of anoxic aeration stages and short cycles in anoxic/aerobic cycling reactor resulted in great performance of this reactor in removing nitrogen from wastewater. As a result, continuous influent and effluent flow, and not needing external carbon resulted in AACR good performance in removing nitrogen compounds and organic materials.

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Section: Discussionmentioning

confidence: 98%

The Efficiency of a Novel Cycling Flow Baffled Reactor Performance for the Removal of Nitrogen and Organic Matter from Wastewater

Abbasi

Azhdarpoor

Samaei

2018

Jundishapur J Health Sci

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“…Air-lift bioreactors with a continuous operation regime were not effective to remove phosphorus when compared to the CFIDAB with continuous feed and intermittent discharge regime used in this study. For instance, 12.1 and 6.6 mg/l of phosphorus was eliminated from synthetic wastewater in an airlift intermittent circulation membrane bioreactor and airlift loop reactor under a limited filamentous bulking state, respectively [14,15]. Hence, compared to other BNR systems, it can be concluded that the proposed single bioreactor is a good alternative to treat industrial wastewaters with high phosphorus concentration.…”

Section: Tp Removalmentioning

confidence: 93%

“…It was reported that 78.6 g/m 3 .day and 13.20 g/m 3 .day of TN and TP were removed [14]. In another study, Airlift loop reactor under a limited filamentous bulking state was operated to treat synthetic wastewater, which the average removal efficiencies for COD, NH 4 -N, TN and TP were 91, 92, 86 and 94%, respectively at HRT of 11 h [15].…”

Section: Introductionmentioning

confidence: 97%

High rate simultaneous nutrients removal in a single air lift bioreactor with continuous feed and intermittent discharge regime: Process optimization and effect of feed characteristics

Asadi

Zinatizadeh

Loosdrecht

2016

Chemical Engineering Journal

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In this research, continuous feed and intermittent discharge air lift bioreactor (CFIDAB) was evaluated under two independent variables to treat milk processing wastewater (MPW). The effect of HRT (6-14 h) and air flow rate (1-3 l/min) on the performance of CFIDAB was studied in a laboratory scale of the bioreactor. The optimum values of HRT and air flow rate were 10 h and 3 l/min, reaching SCOD, TN, and TP removal efficiency around 98, 85, and 78%, respectively. The results showed that TP and TN removal were enhanced simultaneously with an increase in HRT and air flow rate. Oxidation-reduction potential (ORP) measurement at the optimal condition showed the successful occurrence of anaerobic, anoxic, and aerobic zones in the CFIDAB. Moreover, the effect of feed characteristics on the process performance for milk processing and soft drink wastewaters was investigated. Based on the obtained data, CFDIAB operated with soft drink wastewater (SDW) showed a better performance in removal of carbon and phosphorus compounds, while nitrogen content was removed more efficient for MPW. As a result, the performance of CFIDAB is sensitive to BOD 5 /COD ratio of wastewater. Overall, this single compartment airlift bioreactor could act as an efficient biological nutrient removal system, providing the conditions for good carbon and nutrient removal. It showed an excellent reactor geometry as well as operating strategy to be used as a membrane bioreactor.

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“…At DO concentrations of 2 and 3.5 mg/l, the TN removal efficiency was increased with decreasing COD/N ratio which confirms the high capacity of this system for nitrogen removal. Table 9 compares the performance of this innovative system with other bioreactors applied for the simultaneous nutrients removal [13,14,23,25,[44][45][46][47][48]. It is clearly found from Table 9, single bioreactors with CFID regime shows more capability to remove CNP from wastewater relative to the other proposed single bioreactors.…”

Section: Effect Of Cod/n Ratiomentioning

confidence: 98%

“…for treating cheese whey wastewater [8], bubble column with a draught tube to treat synthetic wastewater [9], a biofilm airlift suspension extension reactor to treat synthetic wastewater [10], radial anaerobic-aerobic immobilized biomass (RAAIB) bioreactor to treat sewage wastewater [11], simultaneous anaerobic-aerobic (SAA) bioreactor for treating diluted land filled leachate [12], an airlift loop reactor under a limited filamentous bulking state for treating synthetic wastewater [13], airlift intermittent circulation membrane bioreactor for treating synthetic wastewater [14].…”

Section: Introductionmentioning

confidence: 99%

A novel continuous feed and intermittent discharge airlift bioreactor (CFIDAB) for enhanced simultaneous removal of carbon and nutrients from soft drink industrial wastewater

Asadi

Zinatizadeh

Loosdrecht

2016

Chemical Engineering Journal

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Implementation of different redox zones is an interesting method to amend single bioreactors for the simultaneous nutrient removal process. Air lift bioreactors have been noticed recently as a system that could provide environments with different oxidation-reduction potentials (ORP). In this study, the performance of a novel continuous feed and intermittent discharge airlift bioreactor (CFIDAB) for simultaneous removal of nutrients (N and P) from soft-drink wastewater was investigated. Three independent variables were selected to analyze, model and optimize the process at three levels. The variables were hydraulic retention time (HRT) (6-14 h), the diameter ratio of internal and external column (D in /D out) (0.3-0.7) (Corresponding to 10-1 as surface area of downcommer and riser ratio), and dissolved oxygen (DO) concentration (0.5-3.5 mg/l). Three different zones; anaerobic, anoxic, and aerobic zones, were successfully provided in the bioreactor under continuous aeration. An industrial soft drink wastewater with COD:N:P of 100:16:5 was used as feed. The optimum condition was determined as 12 h HRT, a D in /D out ratio of 0.5 and DO concentration of 3.5 mg/l At the optimum condition, COD, TN, and TP removal efficiencies were 98, 72, and 65%, respectively. Performance of the CFISAB is extremely influenced by superficial gas velocity due to its direct impact on development of different zones in the single bioreactor. As a conclusion, this innovative single bioreactor is capable to treat wastewaters with high content of carbon and nutrients in smaller volume compared to existing conventional and combined systems.

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Simultaneous carbon and nutrient removal in an airlift loop reactor under a limited filamentous bulking state

Cited by 19 publications

References 31 publications

The Efficiency of a Novel Cycling Flow Baffled Reactor Performance for the Removal of Nitrogen and Organic Matter from Wastewater

The Efficiency of a Novel Cycling Flow Baffled Reactor Performance for the Removal of Nitrogen and Organic Matter from Wastewater

High rate simultaneous nutrients removal in a single air lift bioreactor with continuous feed and intermittent discharge regime: Process optimization and effect of feed characteristics

A novel continuous feed and intermittent discharge airlift bioreactor (CFIDAB) for enhanced simultaneous removal of carbon and nutrients from soft drink industrial wastewater

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