Characterization of methanogenic activity during high-solids anaerobic digestion of sewage sludge

2016 ◽  
Vol 109 ◽  
pp. 96-100 ◽  
Author(s):  
Can Liu ◽  
Huan Li ◽  
Yuyao Zhang ◽  
Qingwu Chen
Keyword(s):  
Anaerobic Digestion ◽  
Sewage Sludge ◽  
High Solids ◽  
Methanogenic Activity

Enhancement of methanogenic activity in anaerobic digestion of high solids sludge by nano zero-valent iron

2020 ◽  
Vol 703 ◽  
pp. 135532 ◽  
Author(s):  
Jun Zhou ◽  
Xiaogang You ◽  
Baowei Niu ◽  
Xiaoqi Yang ◽  
Lei Gong ◽  
...  
Keyword(s):  
Anaerobic Digestion ◽  
Zero Valent Iron ◽  
High Solids ◽  
Methanogenic Activity ◽  
Nano Zero Valent Iron

Process performance of high-solids batch anaerobic digestion of sewage sludge

2014 ◽  
Vol 35 (21) ◽  
pp. 2652-2659 ◽  
Author(s):  
Xiaocong Liao ◽  
Huan Li ◽  
Yingchao Cheng ◽  
Nan Chen ◽  
Chenchen Li ◽  
...  
Keyword(s):  
Anaerobic Digestion ◽  
Sewage Sludge ◽  
Process Performance ◽  
High Solids

Anaerobic co-digestion of sewage sludge and food waste using temperature-phased anaerobic digestion process

2004 ◽  
Vol 50 (9) ◽  
pp. 107-114 ◽  
Author(s):  
H.-W. Kim ◽  
S.-K. Han ◽  
H.-S. Shin
Keyword(s):  
Anaerobic Digestion ◽  
Sewage Sludge ◽  
Production Rate ◽  
Food Waste ◽  
Batch Reactor ◽  
Hydrolytic Activity ◽  
Organic Loading Rate ◽  
Methanogenic Activity ◽  
Ch4 Production ◽  
Low Efficiency

This study was performed to overcome the low efficiency of anaerobic digestion of sewage sludge and food waste by combining temperature-phased digestion, sequencing batch operation, and co-digestion technology. It was demonstrated that the temperature-phased anaerobic sequencing batch reactor (TPASBR) system for the co-digestion of sewage sludge and food waste resulted in enhanced volatile solids (VS) reduction and methane production rate. At the organic loading rate (OLR) of 2.7 g VS/l/d, the TPASBR system showed the higher VS reduction (61.3%), CH4 yield (0.28 l/g VSadded) and CH4 production rate (0.41 l CH4/l/d) than those (0.29 l CH4/l/d) of the mesophilic two-stage ASBR (MTSASBR). In the specific methanogenic activity (SMA) tests on thermophilic biomass of the TPASBR system, the average SMA of acetate (93 ml CH4/gVSS/d) was much higher than those of propionate (46 ml CH4/g VSS/d) and butyrate (76 ml CH4/g VSS/d). Also, higher specific hydrolytic activity (SHA, 217 mg COD/g VSS/d) of the biomass supported fast hydrolysis under thermophilic conditions. The track study revealed that the most active period of the 24 h cycle was between 6 and 12 h. The enhanced performance of the TPASBR system could be attributed to longer solids retention time, fast hydrolysis, higher CH4 conversion rate, and balanced nutrient condition of co-substrate. It was verified that this combination could be a promising and practical alternative for the simultaneous recycling of two types of organic fraction of municipal solid waste (OFMSW) with high stability.

Characterization of the curing process from high-solids anaerobic digestion

2010 ◽  
Vol 101 (2) ◽  
pp. 537-544 ◽  
Author(s):  
Margaret F. Drennan ◽  
Thomas D. DiStefano
Keyword(s):  
Anaerobic Digestion ◽  
Curing Process ◽  
High Solids

High-solids anaerobic digestion of cassava pulp in semi-continuous bioreactors

BioResources ◽  
2021 ◽  
Vol 16 (4) ◽  
pp. 6723-6736
Author(s):  
Wei Zhao ◽  
Chen-Yu Zhou ◽  
Jun Zhang ◽  
Dun-Qiu Wang
Keyword(s):  
Organic Matter ◽  
Anaerobic Digestion ◽  
Sewage Sludge ◽  
High Solids ◽  
Total Solids ◽  
Loading Rates ◽  
Cassava Pulp ◽  
Volatile Solids ◽  
Organic Matter Loading ◽  
Mesophilic Conditions

The effects of two total solids contents (TS) and two inocula were studied for the semi-continuous high-solids anaerobic digestion (HS-AD) of cassava pulp under mesophilic conditions (35 ± 2 °C). In the 1.0-L bioreactors, two TS of 15% and 20% with digestate as a sole inoculum were chosen to run the HS-AD, and two inocula (the digestate from the AD of cassava pulp and sewage sludge) were used separately under TS 20%. All treatments were carried out at the organic matter loading rates (OLRs) of from 3.0 to 10.0 kg volatile solids (VS)/(m3·d), with each phase of 6 days followed by two 3-days phases of no feeding and then low OLR of 6.5 kg VS/(m3·d). Compared with TS 15%, the bioreactors of TS 20% with the digestate had a higher buffering capability to alleviate the rapid acidification and a higher level of the specific methane yields (SMYs) of from 0.212 to 0.233 m3/(kgVSadded) at the OLRs of 4.0 to 6.5 kgVS/(m3·d), while TS 15% obtained the highest SMY of from 0.152 to 0.182 m3/(kgVSadded) at the OLR of 4.0, 6.5, and 8.0 kgVS/(m3·d). In contrast, sewage sludge did not restrain the rapid acidification and only yielded quite small SMYs under TS 20%.

Simultaneous treatment of sewage sludge and food waste by the unified high-rate anaerobic digestion system

2006 ◽  
Vol 53 (6) ◽  
pp. 29-35 ◽  
Author(s):  
H.-W. Kim ◽  
S.-K. Han ◽  
H.-S. Shin
Keyword(s):  
Anaerobic Digestion ◽  
Sewage Sludge ◽  
Production Rate ◽  
Food Waste ◽  
High Rate ◽  
Organic Loading Rate ◽  
Simultaneous Treatment ◽  
Methanogenic Activity ◽  
Ch4 Production ◽  
Methane Production Rate

This study aimed to evaluate the performance of the unified high-rate anaerobic digestion (UHAD) system treating co-substrate of sewage sludge and food waste. A 24-hr operating sequence consisted of four steps including fill, react, settle, and draw. The effects of co-substrate and organic loading rate (OLR) on the performance were investigated to verify the system applicability. In each OLR, the UHAD system showed higher CH4 recovery (>70%), CH4 yield (0.3 L CH4/g VSadded) and CH4 production rate (0.6 L CH4/L/d) than the control system. In the specific methanogenic activity (SMA) tests on thermophilic biomass of the UHAD system, the average SMA of acetate (102 mL CH4/gVSS/d) was much higher than those of butyrate (85 mL CH4/g SS/d) and propionate (42 mL CH4/gVSS/d). It was demonstrated that the UHAD system for co-digestion resulted in higher methane yield and methane production rate due to sequencing batch operation, thermophilic digestion, and co-digestion. The enhanced performance could be attributed to longer retention time of active biomass, faster hydrolysis, higher CH4 conversion rate, and balanced nutrient conditions of co-substrate in the UHAD system. Consequently, this optimized unification could be a viable option for the simultaneous treatment of two types of OFMSW with high stability.

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