Ammonia inhibition in anaerobic digestion: A review

Yenigün, Orhan; Demirel, Burak

doi:10.1016/j.procbio.2013.04.012

Cited by 1,074 publications

(543 citation statements)

References 92 publications

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“…The slightly higher TAN concentrations found under thermophilic conditions support the view that greater protein hydrolysis was occurring. Final TAN values were still below inhibitory concentrations, as stated by Yenigün and Demirel (2013), and probably provided additional buffering capacity.…”

Section: Digestion Performancementioning

confidence: 71%

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Comparison of mesophilic and thermophilic anaerobic digestion of sugar beet pulp: Performance, dewaterability and foam control

Suhartini

Heaven

Banks

2014

Bioresource Technology

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Digestion of sugar beet pulp was assessed in relation to biogas and methane production, foaming potential, and digestate dewaterability. Four 4-litre working volume digesters were operated mesophilically (37 ±0.5 o C) and four thermophilically (55±0.5 o C) over three hydraulic retention times. Digesters were operated in duplicate at organic loading rates (OLR) of 4 and 5 g volatile solids l -1 day -1 without water addition. Thermophilic digestion gave higher biogas and methane productivity than mesophilic and was able to operate at the higher OLR, where mesophilic digestion showed signs of instability. Digestate dewaterability was assessed using capillary suction time and frozen image centrifugation. The occurrence of, or potential for, stable foam formation was assessed using a foaming potential test. Thermophilic operation allowed higher loadings to be applied without loss of performance, and gave a digestate with superior dewatering characteristics and very little foaming potential.

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Section: Digestion Performancementioning

confidence: 71%

“…This corresponded to an increase in TAN (Fig. 3b) which reached 1.4-1.5 g N kg -1 WW, below values considered inhibitory to mesophilic (Yenigün and Demirel, 2013). At an OLR of 5 g VS l -1 day -1 total alkalinity and TAN concentrations decreased from around day 120.…”

Section: Digestion Performancementioning

confidence: 87%

Comparison of mesophilic and thermophilic anaerobic digestion of sugar beet pulp: Performance, dewaterability and foam control

Suhartini

Heaven

Banks

2014

Bioresource Technology

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“…Duan and Savage [23] also indentified ammonia in the aqueous phase obtained from an upgrading process of algal biocrude in the supercritical water media through GC-MS analysis. By employing UV-Vis spectroscopy, Tommaso et al [24] also concluded that the aqueous phase converted from HTL of mixed-culture algae at 260-320°C contains 2000-4500 ppm ammonia, which is higher than the threshold concentrations (1100 ppm) for a typical anaerobic digestion [25]. Furthermore, according to another related study [26], the total nitrogen of aqueous phase from HTL of CP was gradually increased with the increasing temperature from 260°C to 300°C.…”

Section: Nmr Analysismentioning

confidence: 98%

An investigation of reaction pathways of hydrothermal liquefaction using Chlorella pyrenoidosa and Spirulina platensis

Gai

Zhang

Chen

et al. 2015

Energy Conversion and Management

252

109

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a b s t r a c tLow-lipid microalgae can be successfully converted to bio-crude oil in a hydrothermal liquefaction (HTL) environment. This study examined the behavior of hydrothermal liquefaction of two low-lipid content microalgae in subcritical water between 200°C and 320°C at 20°C intervals. Under these conditions, the chemical composition and functional groups for the bio-crude oil and aqueous fraction were analyzed. Results indicated that reaction temperature greatly affected the distribution of chemical composition and functional groups of HTL bio-crude oil and aqueous fraction. The bio-crude oil with a higher percentage of aliphatic functional groups was obtained at higher reaction temperatures (280-320°C). Besides, the aqueous fraction recovered under the same operating conditions had a lower concentration of nitrogenous organic compounds (NOCs) with two or more methyl groups. The general reaction network for HTL of low-lipid microalgae was proposed. The specific reaction pathways for microalgae substrates were analyzed in terms of lipid, protein and non-fibrous carbohydrate based on the spectral analysis.

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“…This material has a high protein content, however, which releases ammonia when hydrolysed and although this can increase the buffering capacity of the AD process, the overall C/N ratio is only 5 to 10 (Yangin- Gomec & Ozturk, 2013). This is lower than that for manure from other farm animals, food waste, and waste active sludge (Bujoczek et al, 2000;Niu et al, 2013) and can lead to operational difficulties through inhibition of the methanogenic microflora as a result of free ammonia accumulation in the digester (Sun et al, 2015a;Yenigun & Demirel, 2013).…”

Section: Introductionmentioning

confidence: 99%

Biogas production from undiluted chicken manure and maize silage: A study of ammonia inhibition in high solids anaerobic digestion

Sun

Cao

Banks

et al. 2016

Bioresource Technology

156

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The feasibility of co-digestion of chicken manure (CM) and maize silage (MS) without water dilution was investigated in 5-L digesters. Specific methane production (SMP) of 0.309 L CH 4 g -1 volatile solids (VS) was achieved but only at lower %CM. Above a critical threshold for total ammonia nitrogen (TAN), estimated at 7 g N L -1 , VFA accumulated with a characteristic increase in acetic acid followed by its reduction and an increase in propionic Methanogenesis was completely inhibited at TAN of 9 g N L -1 . The low digestibility of the mixed feedstock led to a rise in digestate TS and a reduction in SMP over the 297-day experimental period. Methanogenesis appeared to be failing in one digester but was recovered by reducing the %CM. Co-digestion was feasible with CM ≤20% of feedstock VS, and the main limiting factor was ammonia inhibition.

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Ammonia inhibition in anaerobic digestion: A review

Cited by 1,074 publications

References 92 publications

Comparison of mesophilic and thermophilic anaerobic digestion of sugar beet pulp: Performance, dewaterability and foam control

Comparison of mesophilic and thermophilic anaerobic digestion of sugar beet pulp: Performance, dewaterability and foam control

An investigation of reaction pathways of hydrothermal liquefaction using Chlorella pyrenoidosa and Spirulina platensis

Biogas production from undiluted chicken manure and maize silage: A study of ammonia inhibition in high solids anaerobic digestion

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