Effect of Organic Loading Rate on Biogas Yields of Rice Straw using a Plug Flow Reactor at Mesophilic Temperature

2017 ◽  
Author(s):  
Ademola Oyejide Adebayo ◽  
Noor Ahmed
Keyword(s):  
Rice Straw ◽  
Loading Rate ◽  
Flow Reactor ◽  
Plug Flow ◽  
Plug Flow Reactor ◽  
Organic Loading Rate ◽  
Organic Loading ◽  
Mesophilic Temperature

Performance of an anaerobic plug-flow reactor treating agro-industrial wastes supplemented with lipids at high organic loading rate

2021 ◽  
pp. 0734242X2199189
Author(s):  
Alexandros Eftaxias ◽  
Dimitrios Georgiou ◽  
Vasileios Diamantis ◽  
Alexandros Aivasidis
Keyword(s):  
Volatile Fatty Acids ◽  
Loading Rate ◽  
Flow Reactor ◽  
Plug Flow ◽  
Plug Flow Reactor ◽  
Industrial Wastes ◽  
High Rate ◽  
Organic Loading Rate ◽  
Organic Loading ◽  
Used Cooking Oil

This study evaluated the performance of a plug-flow reactor (PFR) for high-rate anaerobic co-digestion of complex agro-industrial wastes and used cooking oil or animal fat. The PFR was successfully operated up to an organic loading rate (OLR) of 21 g L−1 d−1, yielding biogas at 0.35 L g−1 chemical oxygen demand (COD) influent. During the study period, supernatant COD at the PFR effluent remained between 4 and 7 g L−1, with negligible volatile fatty acids’ concentrations (<500 mg L−1) and no presence of foaming incidents. The biomass concentration inside the PFR, expressed as total suspended solids, remained between 30 and 60 g L−1. Moreover, the above-mentioned anaerobic digestion technology has been currently scaled-up at 50 m3 PFR, while a full-scale facility of 240 kW-el is under construction in the region of north-eastern Greece.

Phase separation during anaerobic fermentation of solid substrates in an innovative plug-flow reactor

1997 ◽  
Vol 36 (6-7) ◽  
pp. 303-310 ◽  
Author(s):  
Tuanchi Liu ◽  
Sambhunath Ghosh
Keyword(s):  
Phase Separation ◽  
Flow Reactor ◽  
Anaerobic Fermentation ◽  
Plug Flow ◽  
Plug Flow Reactor ◽  
Organic Loading ◽  
Loading Rates ◽  
Solid Substrates ◽  
Solids Content ◽  
Acidogenic Phase

Separation of the liquefaction-acidification and gasification phases of anaerobic digestion was studied in a simple, plug-flow reactor (PFR) charged with 3 to 10 wt% solids-content feed slurries. The unmixed PFR had zigzagging parallel channels with floors sloping towards the outlet. Steady-state runs were conducted at hydraulic retention times of 32 to 13 days and organic loading rates (OLRs) of 0.84 to 6.84 kg-VS/m3-d. Phase separation was first observed when the OLR was 2.05 kg-VS/m3-d. Longitudinal pH and volatile fatty acid (VFA) profiles at this OLR showed a lowest pH of 6.10 and a highest VFA accumulation of 1500 mg/l. The acidogenic phase predominated within the first 50 cm from the inlet, and the methanogenic phase prevailed in the remainder of the PFR. At an OLR of 6.84 kg-VS/m3-d the pH dropped to 4.4, and the VFA accumulated to 9600 mg/l with the acidogenic phase extending to 83 cm from the PFR inlet. Unlike a CSTR digester, the PFR always recovered from the initial sour digestion and afforded high VS reductions of 78 to 63% corresponding to methane yields of 0.36 to 0.28 m3/kg-VS added.

Effects of feedstock ratio and organic loading rate on the anaerobic mesophilic co-digestion of rice straw and cow manure

2015 ◽  
Vol 189 ◽  
pp. 319-326 ◽  
Author(s):  
Dong Li ◽  
Shengchu Liu ◽  
Li Mi ◽  
Zhidong Li ◽  
Yuexiang Yuan ◽  
...  
Keyword(s):  
Rice Straw ◽  
Loading Rate ◽  
Organic Loading Rate ◽  
Cow Manure ◽  
Organic Loading
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