Thermophilic anaerobic co-digestion of coffee grounds and excess sludge: long term process stability and energy production

RSC Advances ◽  
2015 ◽  
Vol 5 (34) ◽  
pp. 26452-26460 ◽  
Author(s):  
Wei Qiao ◽  
Shofie Mohammad ◽  
Kazuyuki Takayanagi ◽  
Yu-you Li
Keyword(s):  
Anaerobic Digestion ◽  
Energy Production ◽  
Stirred Tank ◽  
Process Stability ◽  
Excess Sludge ◽  
Tank Reactor ◽  
Thermophilic Anaerobic Digestion ◽  
Coffee Grounds ◽  
Continuously Stirred Tank Reactor

In this research, thermophilic anaerobic digestion of coffee grounds and sludge was carried out using a 12 liter continuously stirred tank reactor (CSTR) to identify the inhibitory factors and to evaluate the energy production.

scholarly journals Anaerobic digestion performance of vinegar residue in continuously stirred tank reactor

2015 ◽  
Vol 186 ◽  
pp. 338-342 ◽  
Author(s):  
Lin Li ◽  
Lu Feng ◽  
Ruihong Zhang ◽  
Yanfeng He ◽  
Wen Wang ◽  
...  
Keyword(s):  
Anaerobic Digestion ◽  
Stirred Tank ◽  
Stirred Tank Reactor ◽  
Tank Reactor ◽  
Vinegar Residue ◽  
Continuously Stirred Tank Reactor

Mesophilic–thermophilic–mesophilic anaerobic digestion of liquid dairy cattle manure

2006 ◽  
Vol 53 (8) ◽  
pp. 253-261 ◽  
Author(s):  
M. Effenberger ◽  
J. Bachmaier ◽  
G. Garcés ◽  
A. Gronauer ◽  
P.A. Wilderer ◽  
...  
Keyword(s):  
Anaerobic Digestion ◽  
Dairy Cattle ◽  
Loading Rate ◽  
Cattle Manure ◽  
Methane Yield ◽  
Stirred Tank ◽  
Tank Reactor ◽  
Digestion Efficiency ◽  
Continuously Stirred Tank Reactor ◽  
Intestinal Enterococci

The potential of a mesophilic–thermophilic–mesophilic anaerobic digestion system was investigated with respect to improvement of both digestion and sanitation efficiencies during treatment of liquid cattle manure. The pilot plant produced a high methane yield from liquid dairy cattle manure of 0.24 m3 (kg VSfed)−1. Considering the low system loading rate of 1.4–1.5 kg VS (m3 d)−1, digestion efficiency compared to conventional processes did not appear improved. The minimum guaranteed retention time in the tubular thermophilic reactor was increased compared to a continuously stirred tank reactor. Levels of intestinal enterococci in raw liquid manure as determined with cultivation methods were reduced by 2.5–3 log units to a level of around 102 cfu/mL. This sanitizing effect was achieved both during mesophilic–thermophilic–mesophilic and thermophilic–mesophilic treatment, provided the thermophilic digester was operated at 53–55°C. A change in feeding interval from 1 h to 4 h did not significantly alter methane yield and sanitation efficiency. It was proposed that a two-stage, thermophilic–mesophilic anaerobic digestion system would be able to achieve the same sanitizing effect and equal or better digestion efficiency at lower costs.

Numerical Bifurcation Analysis of Delayed Recycle Stream in a Continuously Stirred Tank Reactor

2010 ◽  
Author(s):  
Nalwala Rohitbabu Gangadhar ◽  
Periyasamy Balasubramanian ◽  
Swapan Paruya ◽  
Samarjit Kar ◽  
Suchismita Roy
Keyword(s):  
Bifurcation Analysis ◽  
Stirred Tank ◽  
Stirred Tank Reactor ◽  
Tank Reactor ◽  
Continuously Stirred Tank Reactor ◽  
Numerical Bifurcation ◽  
Numerical Bifurcation Analysis

Modeling ammonia removal in aerated facultative lagoons

2005 ◽  
Vol 51 (12) ◽  
pp. 139-142 ◽  
Author(s):  
C.D. Houweling ◽  
L. Kharoune ◽  
A. Escalas ◽  
Y. Comeau
Keyword(s):  
Seasonal Variation ◽  
Activated Sludge ◽  
Water Column ◽  
Bacterial Growth ◽  
Organic Material ◽  
Mechanistic Model ◽  
Ammonia Removal ◽  
Stirred Tank ◽  
Tank Reactor ◽  
Continuously Stirred Tank Reactor

A mechanistic model has been developed to model ammonia removal in aerated facultative lagoons. Flow is modeled through the water column by a continuously stirred tank reactor and exchanges between the sludge layer and the water column are simulated by a solids separator. The biological model is based on an activated sludge model with reactions added for anaerobic bacterial growth and degradation of inert organic material. Results show that the model is able to predict seasonal variation in ammonia removal as well as sludge accumulation in the lagoons.

A critical review of conventional and emerging methods for improving process stability in thermophilic anaerobic digestion

2020 ◽  
Vol 54 ◽  
pp. 72-84 ◽  
Author(s):  
John Ryue ◽  
Long Lin ◽  
Farokh Laqa Kakar ◽  
Elsayed Elbeshbishy ◽  
Abdullah Al-Mamun ◽  
...  
Keyword(s):  
Anaerobic Digestion ◽  
Critical Review ◽  
Process Stability ◽  
Thermophilic Anaerobic Digestion
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