Denitrification of simulated municipal wastewater treatment plant effluent using a three-dimensional biofilm-electrode reactor: Operating performance and bacterial community

Hao, Ruixia; Li, Sumei; Li, Jianbing; Meng, Chengcheng

doi:10.1016/j.biortech.2013.06.001

Cited by 100 publications

(55 citation statements)

References 30 publications

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“…However, this mechanism has not been well studied and its significance is unclear. Electrolysis of water is another indirect electron transfer mechanism, and different reactor configurations and operational parameters have been employed to leverage this mechanism (Gregory et al, 2004;Hao et al, 2013;Park et al, 2005;Prosnansky et al, 2005;Prosnansky et al, 2002;Sakakibara and Kuroda, 1993;Thrash and Coates, 2008;Wrighton et al, 2010). In this mechanism, H 2 produced from electrolysis of water can serve as an electron donor for the denitrifying microorganism.…”

Section: Theorymentioning

confidence: 99%

“…BER design parameters include selection of electrode materials, placement of electrodes, flow direction relative to electrode placement, HRT and current density. In fact, previous studies have shown that different reactor configurations have different nitrate removal, but optimal design required an external pH buffer to maintain pH of the water (Hao et al, 2013;Prosnansky et al, 2002;Prosnansky et al, 2005). At the field scale, pH buffer addition would likely be cost prohibitive, and thus an alternative approach is sought.…”

Section: Introductionmentioning

confidence: 99%

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Electrical stimulation for enhanced denitrification in woodchip bioreactors: Opportunities and challenges

Law

Soupir

Raman

et al. 2018

Ecological Engineering

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Woodchip bioreactors are being implemented for the removal of nitrates in groundwater and tile water drainage. However, low nitrate removals in denitrifying woodchip bioreactors have been observed for short hydraulic retention time (HRT) and low water temperature (°C). One potential approach to improve woodchip bioreactor performance is to provide an alternative and readily available electron source to the denitrifying microorganisms through electrical stimulation. Previous work has demonstrated the capability of bio-electrochemical reactors (BER) to remove a variety of water contaminants, including nitrate, in the presence of a soluble carbon source. The objective of this study was to evaluate the denitrification efficiency of electrically augmented woodchip bioreactors and conduct a simple techno-economic analysis (TEA) to understand the possibilities and limitations for full-scale BER implementation for treatment of agricultural drainage. Up-flow column woodchip bioreactors were studied included two controls (non-energized, and without electrodes), two electrically enhanced bioreactors, each using a single 316 stainless steel anode coupled with graphite cathodes, and two electrically enhanced bioreactors, each with graphite for both anode and cathodes. Both pairs of electrically enhanced bioreactors demonstrated higher denitrification efficiencies than controls when 500 mA of current was applied. While this technology appeared promising, the technoeconomic analysis showed that the normalized N removal cost ($/kg N) for BERs was 2-10 times higher than the base cost with no electrical stimulation. With our current reactor design, opportunities to make this technology cost effective require denitrification efficiency of 85% at 100 mA. This work informs the process and design of electrically stimulated woodchip bioreactors with optimized performance to achieve lower capital and maintenance costs, and thus lower N removal cost. RightsWorks produced by employees of the U.S. Government as part of their official duties are not copyrighted within the U.S. The content of this document is not copyrighted. A B S T R A C TWoodchip bioreactors are being implemented for the removal of nitrates in groundwater and tile water drainage. However, low nitrate removals in denitrifying woodchip bioreactors have been observed for short hydraulic retention time (HRT) and low water temperature (< 10°C). One potential approach to improve woodchip bioreactor performance is to provide an alternative and readily available electron source to the denitrifying microorganisms through electrical stimulation. Previous work has demonstrated the capability of bio-electrochemical reactors (BER) to remove a variety of water contaminants, including nitrate, in the presence of a soluble carbon source. The objective of this study was to evaluate the denitrification efficiency of electrically augmented woodchip bioreactors and conduct a simple techno-economic analysis (TEA) to understand the possibilities and limitations for full-scale BER im...

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Section: Theorymentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Electrical stimulation for enhanced denitrification in woodchip bioreactors: Opportunities and challenges

Law

Soupir

Raman

et al. 2018

Ecological Engineering

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“…There are several studies concerning new technologies for improving existing WWTPs [12][13][14][15][16]. However, the choice of the appropriate upgrading strategy first needs to focus on the causes of the poor efficiency of WWTPs.…”

Section: Open Accessmentioning

confidence: 99%

Influence of Strong Diurnal Variations in Sewage Quality on the Performance of Biological Denitrification in Small Community Wastewater Treatment Plants (WWTPs)

2013

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Abstract:The great diurnal variation in the quality of wastewater of small communities is an obstacle to the efficient removal of high nitrogen with traditional activated sludge processes provided by pre-denitrification. To verify this problem, the authors developed a pilot plant, in which the domestic wastewater of community of 15,000 inhabitants was treated. The results demonstrate that average and peak nitrogen removal efficiencies of over 60% and 70%, respectively, are difficult to obtain because of the strong variations in the BOD 5 /NO 3 -N ratios and the unexpected abnormal accumulation of dissolved oxygen during denitrification when the BOD 5 load is low. These phenomena cause inhibitory effects and BOD 5 deficiency in the denitrification process. The results demonstrate the need for a more complex approach to designing and managing small wastewater treatment plants (WWTPs) provided with denitrification than those usually adopted for medium-and large-size plants.

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“…If insufficient OC was supplied for denitrification, the accumulation of intermediate NO 2 − −N species and low denitrification rate could be observed (Lu et al 2014). This is a challenging problem for wastewater reclamation because the effluent of wastewater treatment plant (WWTP) usually contains little OC source for bacteria to utilize (Hao et al 2013a). Under such situation, some external organic carbon sources (e.g., methanol, ethanol, and acetate) need to be used as electron donors (Lu et al 2014).…”

Section: Introductionmentioning

confidence: 99%

An integrated process of three-dimensional biofilm-electrode with sulfur autotrophic denitrification (3DBER-SAD) for wastewater reclamation

Hao

Meng

2016

Appl Microbiol Biotechnol

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A three-dimensional biofilm-electrode reactor (3DBER) was integrated with sulfur autotrophic denitrification (SAD) to improve nitrogen removal performance for wastewater reclamation. The impacts of influent carbon/nitrogen (C/N) ratio, electric current, and hydraulic retention time (HRT) were evaluated. The new process, abbreviated as 3DBER-SAD, achieved a more stable denitrification compared to the recently studied 3DBER in literature. Its nitrogen removal improved by about 45 % as compared to 3DBER, especially under low C/N ratio conditions. The results also revealed that the biofilm bacteria community of 3DBER-SAD contained 21.1 % of the genus Thauera, 19.3 % of the genus Thiobacillus and Sulfuricella, as well as 5.3 % of the genus Alicycliphilus, Pseudomonas, and Paracoccus. The synergy between these heterotrophic, sulfur autotrophic, and hydrogenotrophic denitrification bacteria was believed to cause the high and stable nitrogen removal performance under various operating conditions.

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Denitrification of simulated municipal wastewater treatment plant effluent using a three-dimensional biofilm-electrode reactor: Operating performance and bacterial community

Cited by 100 publications

References 30 publications

Electrical stimulation for enhanced denitrification in woodchip bioreactors: Opportunities and challenges

Electrical stimulation for enhanced denitrification in woodchip bioreactors: Opportunities and challenges

Influence of Strong Diurnal Variations in Sewage Quality on the Performance of Biological Denitrification in Small Community Wastewater Treatment Plants (WWTPs)

An integrated process of three-dimensional biofilm-electrode with sulfur autotrophic denitrification (3DBER-SAD) for wastewater reclamation

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