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

Long-term high-solids anaerobic digestion of food waste: Effects of ammonia on process performance and microbial community

2018 ◽  
Vol 262 ◽  
pp. 148-158 ◽  
Author(s):  
Xuya Peng ◽  
ShangYi Zhang ◽  
Lei Li ◽  
Xiaofei Zhao ◽  
Yao Ma ◽  
...  
Keyword(s):  
Microbial Community ◽  
Anaerobic Digestion ◽  
Food Waste ◽  
Process Performance ◽  
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%.

Process performance and change in sludge characteristics during anaerobic digestion of sewage sludge with ozonation

2004 ◽  
Vol 49 (10) ◽  
pp. 105-113 ◽  
Author(s):  
R. Goel ◽  
K. Komatsu ◽  
H. Yasui ◽  
H. Harada
Keyword(s):  
Anaerobic Digestion ◽  
Sewage Sludge ◽  
Unit Cost ◽  
Economic Feasibility ◽  
Municipal Sewage Sludge ◽  
Process Performance ◽  
Solid Concentration ◽  
Digested Sludge ◽  
New Process ◽  
Inorganic Content

A new process configuration combining anaerobic digestion with ozonation, and operated at long SRT, was studied with the objective of on-site reduction in sludge quantity and improving biogas recovery. The process performance with respect to solid reduction efficiency and other important process parameters like accumulation of inorganic solids, changes in sludge viscosity and dewatering characteristics were evaluated from the data of long term pilot scale continuous experiments conducted using a mixture of primary and secondary municipal sewage sludge. Due to sludge ozonation and long SRT, high VSS degradation efficiency of approximately 80% was achieved at a reactor solid concentration of 6.5%. A high fraction of inorganic solid (>50%) consisting mainly of acid insoluble and iron compounds was found to accumulate in the reactor. The high inorganic content accumulated in the digested sludge did not, however, contribute to the observed increase in sludge viscosity at high solid concentration. The sludge viscosity was largely found to depend on the organic solid concentration rather than the total solid content. Moreover, higher inorganic content in the digested sludge resulted in better sludge dewaterability. For a quick assessment of the economic feasibility of the new process, an economic index based on the unit cost of digested sludge disposal to unit electric cost is proposed.

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