Present and future solutions of waste management in a candied fruit – jam factory: Optimized anaerobic digestion for on site energy production
| Autor: | Barbara Ruffino, Mariachiara Zanetti |
|---|---|
| Rok vydání: | 2017 |
| Předmět: |
Engineering
Municipal solid waste 020209 energy Strategy and Management Cost benefit-analysis chemistry.chemical_element 02 engineering and technology 010501 environmental sciences 01 natural sciences Industrial and Manufacturing Engineering Methane Mesophilic process chemistry.chemical_compound 0202 electrical engineering electronic engineering information engineering Factory 0105 earth and related environmental sciences General Environmental Science Waste management Renewable Energy Sustainability and the Environment business.industry Fossil fuel Fruit processing waste Digestibility tests Nitrogen Anaerobic digestion High organic load wastewater Sulfite chemistry Wastewater Yield (chemistry) business |
| Zdroj: | Journal of Cleaner Production. 159:26-37 |
| ISSN: | 0959-6526 |
| DOI: | 10.1016/j.jclepro.2017.05.048 |
| Popis: | This paper presents a cost-benefit analysis of a new solution for the management of waste and wastewater in a candied fruit – jam factory. The solid waste products are presently treated via composting, while wastewaters are sent to a conventional biological treatment, after a chemical pre-treatment. This management modality involves an economic cost of 15 k€/y and a direct emission of 435 t CO 2 /y. Due to the high potential of this kind of waste products to generate methane under anaerobic conditions, a Waste-to-Energy solution that considers an optimized anaerobic digestion (AD) process was investigated. Digestibility tests carried out at a lab-scale demonstrated that the solid waste had an average methane specific yield of 0.276 Nm 3 /kgVS added and the liquid waste, that make up the wastewater, had methane specific yields ranging from 0.250 to 0.330 Nm 3 /kgVS added . Moreover, tests demonstrated that an accurate regulation of the food vs. microorganism ratio (F/M), and the addition of nitrogen and buffering resources, were compulsory for a steady development of the AD process. The whole amount of waste generated in the factory can be digested in a 320 m 3 reactor coupled with a 40 kW combined heat and power unit. The AD process can produce approximately 30% of the electrical needs of the plant and supply one part of the heat necessary for the industrial processes, thus saving fossil fuels. Net CO 2 emissions could decrease by approximately a half compared with the present solution. |
| Databáze: | OpenAIRE |
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