Influence of ammonia in the anaerobic digestion of food waste

Yirong, Chaowana; Zhang, Wei; Heaven, S.; Banks, C.J.

doi:10.1016/j.jece.2017.09.043

Cited by 44 publications

(24 citation statements)

References 38 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The inhibitory effect of urea, NH 4 Cl, TAN, FAN and high N concentration in feeding, as well as the effect of elevated ammonium (NH 4 + ), elevated ammonium nitrogen (NH 4 + -N) and elevated TAN on biogas and methane yields, have been previously studied [1,4,15,17,22,32,[51][52][53]. However, no results on the effects of N concentration in inoculum and N-increase rate in feedstock on the level of inhibition in specific methane yield were found.…”

Section: Discussionmentioning

confidence: 99%

“…Utilization of protein-rich substrates, such as kitchen waste, poultry manure, microalgae, green legumes, oilseeds, etc. may lead to high concentrations of nitrogen (N) in the reactor during anaerobic digestion (AD) [1][2][3][4]. High concentrations of N inside the reactor negatively affect process stability and efficiency due to ammonia formation.…”

Section: Introductionmentioning

confidence: 99%

“…A frequently used approach is to feed the reactor with a specific N-or ammonia-increase rate. However, no information on the maximum increase rates is available [1,4,12,[21][22][23][24].…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Effects of Increasing Nitrogen Content on Process Stability and Reactor Performance in Anaerobic Digestion

Morozova¹,

Nikulina²,

Oechsner³

et al. 2020

Energies

View full text Add to dashboard Cite

The aim of this study was to analyse the effect of different nitrogen increase rates in feedstock on the process stability and conversion efficiency in anaerobic digestion (AD). The research was conducted in continuously stirred tank reactors (CSTR), initially filled with two different inocula: inocula #1 with low and #2 with high nitrogen (N) concentrations. Three N feeding regimes were investigated: the “0-increase” feeding regime with a constant N amount in feeding and the regimes “0.25-increase” and “0.5-increase” where the N concentrations in feedstock were raised by 0.25 and 0.5 g·kg−1, respectively, related to fresh matter (FM) every second week. The N concentration inside the reactors increased according to the feeding regimes. The levels of inhibition (Inhibition) in specific methane yields (SMY), related to the conversion efficiency of the substrates, were quantified. At the N concentration in digestate of 10.82 ± 0.52 g·kg−1 FM measured in the reactors with inoculum #2 and “0.5-increase” feeding regime, the level of inhibition was equal to 38.99% ± 14.99%. The results show that high nitrogen increase rates in feeding regime are negatively related to the efficiency of the AD process, even if low volatile fatty acid (VFA) concentrations indicate a stable process.

show abstract

Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Effects of Increasing Nitrogen Content on Process Stability and Reactor Performance in Anaerobic Digestion

Morozova¹,

Nikulina²,

Oechsner³

et al. 2020

Energies

View full text Add to dashboard Cite

show abstract

“…This was clearly demonstrated in a comparative study by Yirong et al (2013a) which showed the onset of failure in thermophilic SS-DFW digesters when TAN concentrations reached 3.0 g N L -1 . A parallel study with acclimatisation to thermophilic conditions using a low nitrogen (1.45 % of dry weight) synthetic food waste showed long-term stable operation was possible in thermophilic conditions, while subsequent increases in the nitrogen concentration by addition of urea to this feedstock confirmed that the critical TAN concentration was between 2.5-3.0 g N L -1 (Yirong et al, 2013b; VALORGAS, 2013), equivalent to FAN concentrations of 590-710 mg N L -1 at the operational pH. This threshold value is similar to that reported in other studies where suppression of methanogenic activity as a result of ammonia toxicity has been demonstrated in thermophilic systems (Angelidaki and To maximise the specific methane yield in thermophilic digestion of SS-DFW while avoiding VFA accumulation and process instability, one approach is to reduce the TAN concentration in the digester by gas stripping.…”

Section: Introductionmentioning

confidence: 94%

Biogas stripping of ammonia from fresh digestate from a food waste digester

Serna‐Maza

Heaven

Banks

2015

Bioresource Technology

View full text Add to dashboard Cite

The efficiency of ammonia removal from fresh source-segregated domestic food waste digestate using biogas as a stripping agent was studied in batch experiments at 35, 55 and 70 ⁰C, at gas flow rates of 0.125 and 0.250 L biogas min -1 L -1 digestate with and without pH adjustment. Higher temperatures and alkaline conditions were required for effective ammonia removal, and at 35 ⁰C with or without pH adjustment or 55 ⁰C with unadjusted pH there was little or no removal. Results were compared to those from earlier studies with digestate that had been stored prior to stripping and showed that ammonia removal from fresh digestate was more difficult, with time constants 1.6 to 5.7 times higher than those previously reported. This has implications for the design of large-scale systems where continuous stripping of fresh digestate is likely to be the normal operating mode. A mass balance approach showed that thermal-alkaline stripping improved hydrolysis.

show abstract

“…The treatment of wastewater with a low TOC/N ratio still represents a challenge for industrial wastewater treatment plant. Conventional biological processes, such as Anaerobic Digestion (AD), are generally unsuitable to complete the nitrogen cycle due to the inhibition of microorganisms involved in the treatment [12]. For this reason, effluents from AD are usually rich in ammonium up to 2 kgN/m 3 [13].…”

Section: No −mentioning

confidence: 99%

Shortcut Biological Nitrogen Removal (SBNR) in an MFC Anode Chamber under Microaerobic Conditions: The Effect of C/N Ratio and Kinetic Study

et al. 2018

View full text Add to dashboard Cite

In this work, the feasibility of the Shortcut Biological Nitrogen Removal (SBNR) in the anodic chamber of a Microbial Fuel Cell (MFC) was investigated. Thirty day experiments were carried out using synthetic wastewaters with a Total Organic Carbon vs. nitrogen ratio (TOC/N) ranging from 0.1 to 1. Ammonium, nitrite, nitrate, pH, and TOC were daily monitored. Results showed that microaerobic conditions in the anodic chamber favored the development of nitritation reaction, due to oxygen transfer from the cathodic chamber through the membrane. Nitritation was found to depend on TOC/N ratio: at TOC/N equal to 0.1 an ammonium removal efficiency of up to 76% was observed. Once the oxygen supply to the cathodic chamber was stopped, denitritation occurred, favored by an increase of the TOC/N ratio: a nitrite removal of 80.3% was achieved at TOC/N equal to 0.75. The presence of nitrogen species strongly affected the potential of the electrochemical system: in the nitritation step, the Open Circuit Voltage (OCV) decreased from 180 mV to 21 mV with the decrease of the TOC/N ratio in the investigated range. Lower OCV values were observed in the denitritation steps since the organic carbon acted as the energy source for the conversion of nitrite to nitrogen gas. A kinetic analysis was also performed. Monod and Blackman models described the ammonium and the organic carbon removal processes well during the nitritation step, respectively, while Blackman-Blackman fitted experimental results of the denitritation step better.

show abstract

Influence of ammonia in the anaerobic digestion of food waste

Cited by 44 publications

References 38 publications

Effects of Increasing Nitrogen Content on Process Stability and Reactor Performance in Anaerobic Digestion

Effects of Increasing Nitrogen Content on Process Stability and Reactor Performance in Anaerobic Digestion

Biogas stripping of ammonia from fresh digestate from a food waste digester

Shortcut Biological Nitrogen Removal (SBNR) in an MFC Anode Chamber under Microaerobic Conditions: The Effect of C/N Ratio and Kinetic Study

Contact Info

Product

Resources

About