Enhanced nitrate removal and side effects of methanol dosing in denitrifying bioreactors

Moghaddam, Reza; Torres-Rojas, Dorisel; Schipper, Louis A.

doi:10.1016/j.ecoleng.2022.106818

Cited by 3 publications

(4 citation statements)

References 51 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…18,20 Exogenous C dosing has also been implemented and evaluated in field-scale WBRs. 19,21,22 These studies employed constant dosing rates of methanol or acetate and confirmed that C dosing effectively increased the NO 3 − removal rates under realworld conditions. However, they also showed that C dosing can lead to biofouling of woodchip media and decreases in hydraulic efficiency 19,21 and the release of unmetabolized labile C in bioreactor effluent, contributing to biochemical oxygen demand (BOD) in receiving waters.…”

Section: ■ Introductionmentioning

confidence: 88%

“…Woodchip bioreactor performance is typically poor during cold periods or storm events, 15,18,21,38−40 and here we evaluated the use of biostimulation of microbial denitrification with exogenous carbon to improve NO 3 − removal during these critical times. 19,21,22 Several studies on exogenous carbon dosing of WBRs have been performed in recent years (Table 2) and have shown that C dosing is effective at increasing NRR. Our results confirm the potential of C dosing to increase NRR up to 5-fold relative to "baseline" conditions, and we quantified an improvement in cumulative N load reduction from 11.3% (under a model-based "baseline" scenario) to 24.1%.…”

Section: Effects Of Exogenous Carbon Dosing In Woodchipmentioning

confidence: 99%

See 1 more Smart Citation

Real-Time Control of Exogenous Carbon Dosing in a Denitrifying Woodchip Bioreactor Treating Agricultural Drainage

Zhang,

Echavarria,

Sang

et al. 2024

ACS EST Eng.

View full text Add to dashboard Cite

Nature-based treatment technologies such as denitrifying woodchip bioreactors (WBRs) are employed to manage nitrogen (N) pollution from agricultural nonpoint sources. Due to variability in environmental conditions like temperature and discharge, it is challenging to achieve consistent treatment effectiveness with these passive systems. To improve nitrate (NO 3 − ) load reductions in a field-scale WBR in New York State during cool spring weather, we designed a system for controlled exogenous carbon (C) dosing, allowing rates of C dosing to respond in real time to changing discharge and NO 3 − concentrations. Treatment efficiencies for NO 3 − , acetate mass balances, and other bioreactor properties were monitored from April 5 to June 10, 2023. Biostimulation with 7.5 mg C/L acetate (assuming complete mixing of injected acetate with bioreactor pore water) increased NO 3− removal rates up to 5-fold compared to a model-based scenario of baseline bioreactor performance, and were as high as 0.4 mg NO 3 − −N L −1 h −1 while water temperatures were <12 °C. Increasing acetate concentrations beyond 7.5 mg C/L did not confer a clear improvement in NO 3 − removal rates. Cumulative N load reductions increased from 11.3% under the baseline scenario without C dosing to 24.1% with C dosing. The mass ratio of metabolized C to additional N removal was 2.5:1, although the total dosed C/N mass ratio was 5.1:1 due to incomplete acetate utilization in the reactor. We found evidence that C dosing could enhance the future release of dissolved organic N (DON) and dissolved organic C related to biofilm sloughing. The expense of acetate, with a cost efficiency of 86 USD/kg N, was the main cost driver of the real-time control approach. Our results demonstrate the potential of real-time control of C dosing to meaningfully improve nonpoint source N removal during cool spring conditions but also highlight opportunities for methods to improve acetate utilization efficiencies in order to improve the overall cost-effectiveness of the approach.

show abstract

Section: ■ Introductionmentioning

confidence: 88%

Section: Effects Of Exogenous Carbon Dosing In Woodchipmentioning

confidence: 99%

Real-Time Control of Exogenous Carbon Dosing in a Denitrifying Woodchip Bioreactor Treating Agricultural Drainage

Zhang,

Echavarria,

Sang

et al. 2024

ACS EST Eng.

View full text Add to dashboard Cite

show abstract

“…Physical and chemical technologies have been applied to treat nitrogen pollution in wastewater, such as air stripping and reverse osmosis [12], but these technologies may produce nitrite (NO 2 − ), nitrous oxide (N 2 O) and other secondary pollutants, causing inconvenience to the subsequent treatment [13][14][15]. The end-product of biological nitrogen removal technology is N 2 , which is environmentally friendly.…”

Section: Introductionmentioning

confidence: 99%

“…However, for most industrial wastewaters, organics were deficient. Glucose, methanol and acetate were commonly purchased and added to the wastewater as the electron donor for denitrification [6,15,17]. To save costs and decrease the emission of carbon dioxide, biological autotrophic denitrification technology, especially with the cathode as an electron donor came into people's vision [18].…”

Section: Introductionmentioning

confidence: 99%

A Promising Process to Remove Nitrate from Solar Panel Production Wastewater and Meanwhile Generating Electricity

Chen,

Ding,

Liu

et al. 2023

Water

View full text Add to dashboard Cite

For traditional heterotrophic denitrification technology, organics are usually added as the electron donor for nitrate removal, which increases the operation cost for wastewater treatment. Solar panel production wastewater contains a large amount of nitrate. To decrease the operation cost and reduce CO2 emissions, an iron anode microbial fuel cell (Fe-MFC) was constructed to treat solar panel production wastewater by sequencing batch operation. The results showed that the maximum nitrate removal efficiency reached 99.98% and the maximum removal rate was 0.049 kg·m−3·d−1. The output voltages rose rapidly to 560 ± 10 mV within 2 h and then stabilized at 520 ± 50 mV for about 40 h. Combining the detection of coulombic efficiency, CV curve, q* value and internal resistance; the decrease in denitrification efficiency and electricity generation efficiency probably resulted from the passivation of iron anode and the aging of the cathode biofilm resulted in the efficiency decrease. From the microbial analysis, Chryseobacterium, Thermomonas and Thauera predominated at the end of Fe-MFC operation. Microorganisms that cannot adapt to the autotrophic environment in Fe-MFC died out finally. Periodic replacement of the iron anode and domestication of the bio-cathode were essential to maintain the Fe-MFC efficiency. The Fe-MFC technology was feasible to be used to remove nitrate and generate electricity from solar panel production wastewater. Without organics addition, the Fe-MFC technology was cost-efficient and environmentally friendly, endowing itself with a broad prospect of application.

show abstract

Flow analysis and hydraulic performance of denitrifying bioreactors under different carbon dosing treatments

Moghaddam

Barkle²,

Rivas

et al. 2023

Journal of Environmental Management

View full text Add to dashboard Cite

Enhanced nitrate removal and side effects of methanol dosing in denitrifying bioreactors

Cited by 3 publications

References 51 publications

Real-Time Control of Exogenous Carbon Dosing in a Denitrifying Woodchip Bioreactor Treating Agricultural Drainage

Real-Time Control of Exogenous Carbon Dosing in a Denitrifying Woodchip Bioreactor Treating Agricultural Drainage

A Promising Process to Remove Nitrate from Solar Panel Production Wastewater and Meanwhile Generating Electricity

Flow analysis and hydraulic performance of denitrifying bioreactors under different carbon dosing treatments

Contact Info

Product

Resources

About