Sewage sludge-to-energy approaches based on anaerobic digestion and pyrolysis: Brief overview and energy efficiency assessment

Cao, Yucheng; Pawłowski, Artur

doi:10.1016/j.rser.2011.12.014

Cited by 374 publications

(165 citation statements)

References 50 publications

Supporting

Mentioning

156

Contrasting

Unclassified

Order By: Relevance

“…In addition to technological parameters, Laaber et al 2007 included economic, socio-economic and environmental parameters in the DEA evaluation of biogas plants. Cao & Pawlowski 2012 compared energy efficiency of sewage sludge pyrolysis to anaerobic digestion of sewage sludge followed by pyrolysis with a ratio of energy content of products to the higher heating value of dry material (HHVd) of the sludge. Djatkov et al 2012 rated the overall efficiency of biogas plant by combining the results of four aspects of the biogas plant performance: biogas production, biogas utilization, environmental impacts and socio-economic efficiency.…”

Section: Energy Performance Evaluation Methods From the Literaturementioning

confidence: 99%

Evaluation of methods for estimating energy performance of biogas production

et al. 2014

View full text Add to dashboard Cite

This study focused on identifying various system boundaries and evaluating methods of estimating energy performance of biogas production. First, the output-input ratio method used for evaluating energy performance from the system boundaries was reviewed. Secondly, ways to assess the efficiency of biogas use and parasitic energy demand were investigated. Thirdly, an approach for comparing biogas production to other energy production methods was evaluated. Data from an existing biogas plant, located in Finland, was used for the evaluation of the methods. The results indicate that calculating and comparing the output-input ratios (Rpr1, Rpr2, Rut, Rpl and Rsy) can be used in evaluating the performance of biogas production system. In addition, the parasitic energy demand calculations (w) and the efficiency of utilizing produced biogas (η) provide detailed information on energy performance of the biogas plant. Furthermore, Rf and energy output in relation to total solid mass of feedstock (FO/TS) are useful in comparing biogas production with other energy recovery technologies. As a conclusion it is essential for the comparability of biogas plants that their energy performance would be calculated in a more consistent manner in the future.

show abstract

Section: Energy Performance Evaluation Methods From the Literaturementioning

confidence: 99%

Evaluation of methods for estimating energy performance of biogas production

et al. 2014

View full text Add to dashboard Cite

show abstract

“…Part of the generated heat is used for de-watering of the digestate, control of the AD process, and feedstock sterilization when necessary. Process parameters, such as temperature and retention time (RT), are important to the AD performance [30], especially at an industrial scale. Operational cost of maintaining sludge heat for microbial activities and mixing in the reactor accounts for retention time trade-off, which results in residues with potential for energy recovery, such as those targeted in the proposed integrated system (Case C).…”

Section: Anaerobic Digestion Processmentioning

confidence: 99%

Life Cycle Analysis of Energy Production from Food Waste through Anaerobic Digestion, Pyrolysis and Integrated Energy System

et al. 2017

View full text Add to dashboard Cite

Abstract:The environmental performance of industrial anaerobic digestion (AD), pyrolysis, and integrated system (AD sequence with pyrolysis) on food waste treatment were evaluated using life cycle assessment. The integrated treatment system indicated similar environmental benefits to AD with the highest benefits in climate change and water depletion in addition to the increased energy generation potential and the production of valuable products (biochar and bio-oil). Pyrolysis results illustrated higher impact across water, fossil fuel, and mineral depletion, although still providing a better option than conventional landfilling of food waste. The dewatering phase in the AD process accounted for 70% of the treatment impact while the pre-treatment of the food waste was responsible for the main burden in the pyrolysis process. The study indicated that the three treatment options of food waste management are environmentally more favorable than the conventional landfilling of the wastes.

show abstract

“…Among the sludge treatment processes, anaerobic digestion (AD) is a promising technologies to treat sewage sludge due to the capacity of energy recovery, mass reduction and pathogen removal (Cao and Pawłowski, 2012). In addition, the biological degradation of organic matter in sludge is an important stabilizing process for land application (Chen et al, 2012).…”

Section: Introductionmentioning

confidence: 99%

Rheological properties of sewage sludge during enhanced anaerobic digestion with microwave-H2O2 pretreatment

et al. 2016

View full text Add to dashboard Cite

a b s t r a c tThe rheological behavior of sludge is of serious concern in anaerobic digestion. This study investigated the rheological properties of sewage sludge during enhanced anaerobic digestion with microwave-H 2 O 2 pretreatment (MW-H 2 O 2 ). The results showed that MW-H 2 O 2 pretreatment resulted in the improvement of sludge flowability and weakening of its viscoelastic properties. Further positive effects on the rheological properties of digested sludge during anaerobic digestion were observed. The flowability was improved with a low level of apparent viscosity. The decrease of the consistency index and increase of the flow behavior index indicated that the strength of the inner structures and non-Newtonian flow characteristics of digested sludge weakened. Both the storage modulus (G 0 ) and loss modulus (G 00 ) decreased, indicating that the viscoelastic behavior became weak. These effects were possibly attributed to the changes of the digested sludge micro-structures, such as extracellular polymeric substances (EPS). This study concluded that anaerobic digestion for treating sewage sludge combined with pretreatment is a more favorable option than single anaerobic digestion from the perspective of rheology.

show abstract

Sewage sludge-to-energy approaches based on anaerobic digestion and pyrolysis: Brief overview and energy efficiency assessment

Cited by 374 publications

References 50 publications

Evaluation of methods for estimating energy performance of biogas production

Evaluation of methods for estimating energy performance of biogas production

Life Cycle Analysis of Energy Production from Food Waste through Anaerobic Digestion, Pyrolysis and Integrated Energy System

Rheological properties of sewage sludge during enhanced anaerobic digestion with microwave-H2O2 pretreatment

Contact Info

Product

Resources

About