Optimisation of the two-phase dry-thermophilic anaerobic digestion process of sulphate-containing municipal solid waste: Population dynamics

Zahedi, S.; Sales, D.; Romero, L.I.; Solera, Rosario

doi:10.1016/j.biortech.2013.09.002

Cited by 46 publications

(51 citation statements)

References 32 publications

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“…These can be attributed to more suitable pH and nutrition ( Fig 4A ) for acidogenic bacterial activity in the HAR with three kinds of substrates. Previous studies reported the lower VFAs/sCOD ratio in the HAR of (co-)digestion mainly because of unsuitable pH and excessive organic load [ 33 , 38 ]. As can be seen from Fig 2B , sCOD existing in HARs of G1-G6 shows a rising trend with the increase of KW proportion.…”

Section: Resultsmentioning

confidence: 99%

Improved biogas production and biodegradation of oilseed rape straw by using kitchen waste and duck droppings as co-substrates in two-phase anaerobic digestion

et al. 2017

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Oilseed rape straw (ORS) is a kind of biorefractory waste widely existing in the rural area of China, which is highly suitable to mix with kitchen waste (KW) and duck droppings (DD) in two-phase anaerobic digestion (AD). This research introduced the importance of KW and DD addition to improve the biogas production and biodegradation of ORS. A set of comparative experiments were conducted on two-phase mono- and co-digestion with organic load of 60 g VS/L. The total methane yield (TMY) and the biodegradation of ORS of co-digestions were obviously improving, and the synergistic effect found in the two-phase co-digestions. The optimum mixing ratio of ORS, KW and DD was 50:40:10, and the corresponding TMY and VS degradation rate of ORS were 374.5 mL/g VS and 49.7%, respectively. Addition of KW and DD maintained the pH within the optimal range for the hydrolyzing-acidification, improved the phase separation and buffering capacity of AD system.

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Section: Resultsmentioning

confidence: 99%

Improved biogas production and biodegradation of oilseed rape straw by using kitchen waste and duck droppings as co-substrates in two-phase anaerobic digestion

et al. 2017

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“…TS, VS, soluble Kjeldahl nitrogen (SKN) and SCOD were determined according to standard methods [22] and Zahedi et al [23,24]. NH 4 + was analyzed via ion chromatography (ICS5000, DIONEX).…”

Section: Methodsmentioning

confidence: 99%

Enhancing sludge biodegradability through free nitrous acid pre-treatment at low exposure time

Zahedi¹,

Icaran

Yuan

et al. 2017

Chemical Engineering Journal

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“…Finally, the decreases in the SRT at 5 d supposed the pH dropped to values bellow 6 and the reactor was not recovered. At this condition, the pH decreases as a result of the accumulation of VFA in the reactor due to methanogenic archaea were not able to degrade the excess of VFA produced by hydrolitic-acidogenic bacteria [15,16,20], indicating acidification of the medium and thus destabilize the process. In short, taking to account the pH values it could be said that single-phase mesophilic anaerobic codigestion of the sewage sludge with glycerine (1% v/v) is totally steady at SRTs between 20 and 7 d.…”

Section: Process Stability: Ph Evolution and Vfa/alkalinity Ratiomentioning

confidence: 99%

Mesophilic anaerobic co-digestion of sewage sludge with glycerine: Effect of solids retention time

Zahedi

Rivero

Solera

et al. 2018

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The main objective of this paper was to examine the effect of the increase of organic loading rates (OLRs) (by reducing solid retention time, SRT, from 20 d to 5 d) in single-phase mesophilic anaerobic co-digestion of the sewage sludge with glycerine (1% v/v). Experimentally, it was confirmed that anaerobic co-digestion of these biowastes in steady-state conditions can achieve 85±5% of volatile fatty acid (VFA) reduction at SRTs between 20 and 9 d, with a methane production around 0.8 l CH4/l/d. Decreases in the SRT not only allow maintaining the sludge stability and the biogas production, but it also implies an increase in the waste that could be treated and lower cost. Therefore, mesophilic anaerobic co-digestion of sewage sludge and glycerin at SRT lower than 20 d is possible and preferable, due to it is more economical and environmental friendly.

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Optimisation of the two-phase dry-thermophilic anaerobic digestion process of sulphate-containing municipal solid waste: Population dynamics

Cited by 46 publications

References 32 publications

Improved biogas production and biodegradation of oilseed rape straw by using kitchen waste and duck droppings as co-substrates in two-phase anaerobic digestion

Improved biogas production and biodegradation of oilseed rape straw by using kitchen waste and duck droppings as co-substrates in two-phase anaerobic digestion

Enhancing sludge biodegradability through free nitrous acid pre-treatment at low exposure time

Mesophilic anaerobic co-digestion of sewage sludge with glycerine: Effect of solids retention time

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