Andrea G Capodaglio, Ezio Ranieri and Vincenzo Torretta
– The purpose of this paper is to develop improvements in the efficiency of the codigestion process.
Abstract
Purpose
The purpose of this paper is to develop improvements in the efficiency of the codigestion process.
Design/methodology/approach
Two pilot plants, fed by different compositions of manure and industrial organic waste, generating biogas by mesophilic and thermophilic anaerobic fermentation, respectively, were analysed.
Findings
It was observed that these processes do not commonly operate at maximum theoretical efficiency.
Research limitations/implications
The limiting factor in the process was found to be the hydrolysis of the digested material.
Practical implications
A technical solution had been suggested: implementing a secondary (after) storage phase which has the purpose of exploiting, by promoting enhanced hydrolysis, the substrate potential that remains undigested after the traditional process.
Originality/value
The proposed configuration opens to original variations in the anaerobic digestion schemes.
Details
Keywords
Vincenzo Torretta and Gabriela Ionescu
The purpose of this paper is to point out some important elements that can be useful to minimize the impacts and the results can possibly inform business and policy makers about…
Abstract
Purpose
The purpose of this paper is to point out some important elements that can be useful to minimize the impacts and the results can possibly inform business and policy makers about how to minimize the impacts associated to the municipal solid waste (MSW) collection.
Design/methodology/approach
The present work faces with the problem of transport, placing attention to the relationship of emissions from scenarios that has been selected between real systems of management.
Findings
The choices related to the typology of treatment has the same importance to the item concerning the correct localization of the plant for the implications related to the environmental pressure due to the transport of waste.
Originality/value
An important aspect that has to be considered in terms of MSW management is the stage of collection. The emissions generated from these systems can arrive to values that are of the same order of magnitude of emissions from combustion of waste in waste-to-energy plants according to some scenarios.
Details
Keywords
Stefano Antognoni, Marco Ragazzi, Gabriela Ionescu, Giorgia Passamani, Simone Zanoni, Elena C. Rada and Vincenzo Torretta
In the EU, over the past three decades, poultry production has been growing around the 5 percent per year. This increase determined a higher volume of livestock and poultry…
Abstract
Purpose
In the EU, over the past three decades, poultry production has been growing around the 5 percent per year. This increase determined a higher volume of livestock and poultry farming waste, which represents a potential renewable fuel suitable for waste to energy conversion. One way is through biological process such as the dry anaerobic digestion (AD). Tests normally applied for the measurement of the anaerobic biogas potential (ABP) are reliable, but not feasible as a routine analysis. This kind of test is expensive and time consuming (21-100 days). The purpose of this paper is to propose a rapid method for assessing the potential of biogas in anaerobic poultry manure, with the goal of helping the choices of operators of AD.
Design/methodology/approach
The Dynamic Respiration Index was calculated as “key parameter” in order to estimate the ABP, which provides important information about the biogas generation for the poultry manure. Furthermore, two dynamic respirometric approaches were considered developed in two Italian universities. The main difference between them is the control of temperature.
Findings
Calculate ABP through IRD is a useful method to determine the value of the potential production of biogas of different biomasses in a short time and assess which one is more productive.
Originality/value
The methodology presented in this study is fast (one-five days) and alternative method to determinate the ABP, above all for the operators of AD plant.