Anaerobic digestion of different agricultural wastes: A techno-economic assessment

2020 ◽  
Vol 315 ◽  
pp. 123836
Author(s):  
Yangyang Li ◽  
Yiyu Han ◽  
Yiran Zhang ◽  
Wenhai Luo ◽  
Guoxue Li
Keyword(s):  
Anaerobic Digestion ◽  
Economic Assessment ◽  
Agricultural Wastes

Anaerobic digestion of agricultural wastes from liquid to solid state: Performance and environ-economic comparison

2021 ◽  
pp. 125080
Author(s):  
Yangyang Li ◽  
Chuanren Qi ◽  
Yiran Zhang ◽  
Yanming Li ◽  
Yanqin Wang ◽  
...  
Keyword(s):  
Anaerobic Digestion ◽  
Solid State ◽  
Agricultural Wastes ◽  
Economic Comparison

Biological nutrient removal wastewater treatments and sewage sludge anaerobic mesophilic digestion performances

2002 ◽  
Vol 46 (10) ◽  
pp. 199-208 ◽  
Author(s):  
D. Bolzonella ◽  
L. Innocenti ◽  
F. Cecchi
Keyword(s):  
Anaerobic Digestion ◽  
Sewage Sludge ◽  
Economic Assessment ◽  
Gas Production ◽  
Anaerobic Digester ◽  
Biological Nutrient Removal ◽  
Energetic Balance ◽  
Mesophilic Digestion ◽  
The Difference ◽  
Energy Balances

The paper deals with the performances of the mesophilic anaerobic digestion treatment of sewage sludge from a full scale BNR process without primary settling (nominally 300,000 PE). A relation between the activated sludge observed yields, Yobs, and the anaerobic digester performance was preliminarily found: for values of Yobs of 0.25 kgVSS/kgCOD the anaerobic digester specific gas production showed the best performances (0.22 m3/kgVSfed). This has to be confirmed with wider future studies. It was also shown the level of sludge pre-thickening to be reached for the self-sustaining warming of the digester also in wintertime. According to the energetic balance and to a comparison with an aerobic stabilisation process, it was pointed out as when a co-generation unit for heat and energy production was introduced about 3.4 kWh/PE y of energy were produced in the anaerobic digestion process. On the other hand, 4.3 kWh/PE y were spent if an aerobic stabilisation process was applied. The economic assessment, carried out on the basis of the energy balances, showed that the anaerobic digestion is always economically advantageous if compared to aerobic stabilisation processes, also for small WWTPs. According to the energetic evaluations an environmental balance was assessed, in terms of CO2 emissions. The difference between anaerobic and aerobic processes was about 5.3 kgCO2/PE y in favour of anaerobic processes application.

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