Enhancing denitrification efficiency for nitrogen removal using waste sludge alkaline fermentation liquid as external carbon source

Shao, Mengyu; Guo, Liang; She, Zhigang; Gao, Mengchun; Zhao, Yangguo; Sun, Mei; Guo, Yiding

doi:10.1007/s11356-018-3944-4

Cited by 42 publications

(13 citation statements)

References 42 publications

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“…Moreover, the higher removal efficiency was observed in the ND9C and ND12C treatments with citrate as an extra carbon source, consistent with the result that organic acids (volatile fatty acids) were more conducive to denitrification than carbohydrates (Shao et al, 2019), which may due to that citrate be directly inserted into the metabolic process and improve denitrification (Elefsiniotis et al, 2004;Yang et al, 2012). Besides, higher concentrations of final organic nitrogen and biofloc particle were observed in the treatments at high C/N ratios, while the maximum was observed in the treatment with the addition of glucose.…”

Section: Discussionsupporting

confidence: 85%

Effect of carbon source and C/N ratio on microbial community and function in ex situ biofloc system with inoculation of nitrifiers and aerobic denitrifying bacteria

Qiu

Liao

Wang

et al. 2021

Aquaculture Research

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To control the inorganic nitrogen and biofloc concentrations in the biofloc system, it is necessary to intensify the nitrogen removal by nitrification and denitrification. In this study, nitrifiers and aerobic denitrifying bacteria were inoculated into aquaculture wastewater, with 16.80 mg/L of nitrogen input per day after start‐up, and by addition of glucose and citrate C/N to 9 and 12, without adding carbon source as control (C/N 6.17). The concentrations of inorganic nitrogen, total nitrogen and biofloc, and the diversity of the microbial community were investigated during the experimental period of 40 days. The results showed that 84.17–89.97% of nitrogen input was removed in all the treatments, residual nitrogen was higher in the glucose treatments. Lower inorganic nitrogen at a higher C/N ratio was obtained with the addition of the same carbon source due to more assimilation. Among all, the citrate treatment at C/N 12 obtained the best control in inorganic nitrogen concentrations and better in biofloc concentration owing to efficient dissimilation and assimilation. Moreover, from day 26 to day 40, the number of detected OTUs increased by 22.90–58.40% while the Shannon indices have not changed much in all the treatments. Ten of the top 15 genera were the typical denitrifying genera in each treatment, the total abundance of these decreased by 7.00% to 58.00% while that of Paracoccus, as one of the denitrifiers added, increased by 3.00% to 25.00%. This suggested that the addition of citrate at higher C/N could improve the denitrification function of biofloc system.

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Section: Discussionsupporting

confidence: 85%

Effect of carbon source and C/N ratio on microbial community and function in ex situ biofloc system with inoculation of nitrifiers and aerobic denitrifying bacteria

Qiu

Liao

Wang

et al. 2021

Aquaculture Research

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“…This means that waste carbon sources, with COD/N-NO 3 ratios of 8 and 7, ensured effective denitrification. Similar results were obtained by Shao et al [12]. The authors stated that for denitrification with waste sludge alkaline fermentation liquid as the external carbon source, the optimal was a C/N ratio of 7.…”

Section: Stage-denitrification Of the Effluent From Nitrifying Reactorssupporting

confidence: 86%

Post-Treatment of the Effluent from Anaerobic Digestion of the Leachate in Two-Stage SBR System Using Alternative Carbon Sources

et al. 2021

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Although anaerobic digestion (AD) enables biogas production and facilitates renewable electricity production, its effluent must be post-treated before discarding it into the environment. However, during AD designing, the post-treatment step is often overlooked. This paper presents the kinetics and efficiency of nitrogen removal from effluent after AD of leachate from the aerobic stabilization of the organic fraction of municipal solid waste. A two-stage SBR system was used. An ammonium oxidation rate of 15.5 mg N-NH4/(L·h) ensured a 98% nitrification efficiency (I stage). For denitrification (II stage), alternative carbon sources (ACS) (molasses, crude glycerine, or distillery stillage) were used. Two volumetric exchange rates (n) were tested: 0.35 1/d (COD/N-NO3 ratio of 8) and 0.5 1/d (COD/N-NO3 of 7). With all ACS and COD/N-NO3 ratios, almost 100% of nitrate was denitrified; at the COD/N-NO3 of 8, biodegradable organics remained in the effluents. At the COD/N-NO3 of 7, the denitrification removal rates were lower (29.6-45.1 mg N-NOx/(L·h)) than at the ratio of 8 (72.1–159.5 mg N-NOx/(L·h)), because of temporal nitrite accumulation. The highest nitrate removal rates were obtained with molasses, the lowest with a distillery stillage. Considering the nitrate removal rate and the effluent COD concentration, molasses was recommended as the most effective carbon source for AD effluent treatment at the COD/N-NO3 of 7.

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“…In water treatment systems, the structure and operating practices vary considerably depending on the characteristics of treatable water. If treatable water has a low organic carbon to nitrogen ratio, then there is a lack of electron donors in the environment and one of the main questions becomes how to remove the nitrogen compounds [10][11][12]. Often, organic carbon is added to the system to enhance the microbial denitrification process [13].…”

Section: Introductionmentioning

confidence: 99%

“…Often, organic carbon is added to the system to enhance the microbial denitrification process [13]. In wastewater treatment plants, methanol and ethanol are widely used, and in case of constructed wetlands, organic wood-mulch, activated carbon, and biochar are used as additional organic carbon sources [10,12,14]. This means that when wastewater is being treated, adding organic carbon is feasible and widely used, but when it comes to polluted groundwater, the addition of organic carbon is excluded as it can cause secondary pollution; therefore, another type of approach is necessary [15].…”

Section: Introductionmentioning

confidence: 99%

Enhancing Nitrate Removal from Waters with Low Organic Carbon Concentration Using a Bioelectrochemical System—A Pilot-Scale Study

Lust

Nerut

Kasak

et al. 2020

Water

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Assessments of groundwater aquifers made around the world show that in many cases, nitrate concentrations exceed the safe drinking water threshold. This study assessed how bioelectrochemical systems could be used to enhance nitrate removal from waters with low organic carbon concentrations. A two-chamber microbial electrosynthesis cell (MES) was constructed and operated for 45 days with inoculum that was taken from a municipal wastewater treatment plant. A study showed that MES can be used to enhance nitrate removal efficiency from 3.66% day−1 in a control reactor to 8.54% day−1 in the MES reactor, if a cathode is able to act as an electron donor for autotrophic denitrifying bacteria or there is reducing oxygen in a cathodic chamber to favor denitrification. In the MES, greenhouse gas emissions were also lower compared to the control. Nitrous oxide average fluxes were −639.59 and −9.15 µg N m−2 h−1 for the MES and control, respectively, and the average carbon dioxide fluxes were −5.28 and 43.80 mg C m−2 h−1, respectively. The current density correlated significantly with the dissolved oxygen concentration, indicating that it is essential to keep the dissolved oxygen concentration in the cathode chamber as low as possible, not only to suppress oxygen’s inhibiting effect on denitrification but also to achieve better power efficiency.

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Enhancing denitrification efficiency for nitrogen removal using waste sludge alkaline fermentation liquid as external carbon source

Cited by 42 publications

References 42 publications

Effect of carbon source and C/N ratio on microbial community and function in ex situ biofloc system with inoculation of nitrifiers and aerobic denitrifying bacteria

Effect of carbon source and C/N ratio on microbial community and function in ex situ biofloc system with inoculation of nitrifiers and aerobic denitrifying bacteria

Post-Treatment of the Effluent from Anaerobic Digestion of the Leachate in Two-Stage SBR System Using Alternative Carbon Sources

Enhancing Nitrate Removal from Waters with Low Organic Carbon Concentration Using a Bioelectrochemical System—A Pilot-Scale Study

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