Co-digestion of the organic fraction of municipal solid waste and sludge improves the energy balance of wastewater treatment plants: Rovereto case study

Mattioli, Andrea; Gatti, G.; Mattuzzi, Gp; Cecchi, Fabiola; Bolzonella, David

doi:10.1016/j.renene.2017.06.079

Cited by 84 publications

(45 citation statements)

References 39 publications

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“…On the other hand, energy recovery can still represent a no-regret option if the plant is considered under a broader perspective. An example is the implementation of co-digestion of the organic fraction of municipal waste (Mattioli et al 2017, Maktabifard et al 2018 to improve the organic load (and thus gas production) while integrating the waste and WWT chain, which are commonly regarded and managed as separate businesses. Promising options in this direction come from the view of the plant as a material (other than energy) recovery facility (Coats andWilson 2017, Breach andSimonovic 2018) that look at water reuse, nutrients and chemicals extraction and biosolids reuse.…”

Section: Discussionmentioning

confidence: 99%

Opportunities to improve energy use in urban wastewater treatment: a European-scale analysis

Ganora

Hospido

Husemann³

et al. 2019

Environ. Res. Lett.

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Wastewater treatment is an essential public service that has a major impact on energy use in the urban water cycle, thus receiving increasing attention in context of the Water-Energy Nexus. Understanding the current energy use for wastewater is an essential step to design reliable policies promoting a more efficient use of resources. This paper develops a pan European estimation of electricity use for the treatment of wastewater, based on a dataset of wastewater treatment plants (WWTPs) across the continent. Prediction of electricity use has been performed using a statistical model that accounts for economies of scale. Different scenarios of improvements of energy use efficiency have been investigated to understand the possible reductions in electricity consumption at the continental scale. The overall WWTP electricity use in Europe (only plants with no less than 2000 population equivalent (PE) have been considered) was estimated at 24 747 GWh yr −1 , about the 0.8% of the electricity consumption in the EU-28. Small plants (less than 50 000 PE) represent almost 90% of the total number of plants, but process only 31% of the PE and require 42% of electricity use. Plants from mid to very large size (more than 50 000 PE), being only 10% of the plants, process about 70% of the PE with 58% of the total electricity use. If all plants that use more than the current average were shifted to the average value, the saving would be slightly more than 5500 GWh yr −1 . With highly stringent targets of efficiency improvement, saving of about 13 500 GWh yr −1 could be expected. Further considerations on the emerging role of WWTPs as energy and material producer are finally discussed.

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Section: Discussionmentioning

confidence: 99%

Opportunities to improve energy use in urban wastewater treatment: a European-scale analysis

Ganora

Hospido

Husemann³

et al. 2019

Environ. Res. Lett.

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“…Recently, Mattioli et al (2017) analyzed the effect of co-digestion of municipal solid waste and mixed sludge in Rovereto WWTP (Italy) (95,000 PE). It was shown that by treating 10,000 kg/day of organic waste, biogas generation increased from 1321 to 2723 m 3 /day which consequently doubled the power generation (from 3.9 to 7.8 MWh/day) and resulted in 85% recovery of the WWTP total energy demand.…”

Section: Organic Waste Co-digestionmentioning

confidence: 99%

Achieving energy neutrality in wastewater treatment plants through energy savings and enhancing renewable energy production

Maktabifard

Zaborowska

Mąkinia

2018

Rev Environ Sci Biotechnol

227

106

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Wastewater treatment plants (WWTPs) consume high amounts of energy which is mostly purchased from the grid. During the past years, many ongoing measures have taken place to analyze the possible solutions for both reducing the energy consumption and increasing the renewable energy production in the plants. This review contains all possible aspects which may assist to move towards energy neutrality in WWTPs. The sources of energy in wastewater were introduced and different indicators to express the energy consumption were discussed with examples of the operating WWTPs worldwide. Furthermore, the pathways for energy consumption reductions were reviewed including the operational strategies and the novel technological upgrades of the wastewater treatment processes. Then the methods of recovering the potential energy hidden in wastewater were described along with application of renewable energies in WWTPs. The available assessment methods, which may help in analyzing and comparing WWTPs in terms of energy and greenhouse gas emissions were introduced. Eventually, successful case studies on energy self-sufficiency of WWTPs were listed and the innovative projects in this area were presented.

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“…Anerobic codigestion of leachate has recently gained interest using different substrates, effluents and technolgies [1][2][3]. Leachates, particulary the young ones, are more and more considered as a source of energy and the most emerging reflexion in that field is associated to food waste and landfill leachates and wastewater codigestion in ordre to improve anaerobic wastewater plant efficiency and energy dependence [4][5][6].…”

Section: Introductionmentioning

confidence: 99%

Anaerobic codigestion of urban solid waste fresh leachate and domestic wastewaters: Biogas production potential and kinetic

Moujanni

Qarraey

Ouatmane

2018

Environmental Engineering Research

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The Biochemical Methane Potential (BMP) of fresh leachate and domestic wastewaters codigestion was determined by laboratory Bach Tests at 35ºC over a period of 90 d using a wide range of leachates volumetric ratios from 0% to 100%. To simulate wastewaters plant treatment step, all the ratios were first air stripped for 48 h before anaerobic incubation. The kinetic of biogas production was assessed using modified Gompertz model and exponential equation. The results obtained showed that cumulative biogas production was insignificant in the case of wastewaters monodigestion while the codigestion significantly improves the BMP. Air stripping pretreatment had positive effect on both ammonium concentration and volatiles fatty acids with reduction up to 75% and 42%, respectively. According to the Modified Gompertz model, the optimal anaerobic co-digestion conditions both in terms of maximal biogas potential, start-up period and maximum daily biogas production rate, could be achieved within large leachate volumetric ratios from 25% to 75% with a maximum BMP value of 438.42 mL/g volatile solid at 50% leachate ratio. The positive effect of codigestion was attributed to a dilution effect of chemical oxygen demand and volatile fatty acid concentrations to optimal range that was between 11.7 to 32.3 gO2/L and 2.1 to 7.4 g/L, respectively. These results suggested that the treatment of fresh leachate by their dilution and co digestion at wastewaters treatment plants could be a promising alternative for both energetic and treatment purposes.

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Co-digestion of the organic fraction of municipal solid waste and sludge improves the energy balance of wastewater treatment plants: Rovereto case study

Cited by 84 publications

References 39 publications

Opportunities to improve energy use in urban wastewater treatment: a European-scale analysis

Opportunities to improve energy use in urban wastewater treatment: a European-scale analysis

Achieving energy neutrality in wastewater treatment plants through energy savings and enhancing renewable energy production

Anaerobic codigestion of urban solid waste fresh leachate and domestic wastewaters: Biogas production potential and kinetic

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