It seems that this presentation was a real hit. In ISWA's 2009 Lisbon congress and in HSWMA's 2009 Athens Conference the more or less same presentation created a huge effect between the audience and a plethora of congratulations.
Please allow me to thanks all people encouraging me to write a paper with the same title - I am already working on this.
In the meantime, my presentation is available at:
http://www.scribd.com/doc/22205324/The-Future-of-SWM
The main topics are:
Historic waste
Increasing Quantities
Changing composition of waste
Recycling and resource scarcity
Energy revolution
Robotics
All those are viewed and discussed according their waste management impacts
11.06.2009
7.02.2009
Comparing N2O emissions from organic and mineral fertilisers
This is from "Science for Environment Policy / Issue 158" (service from the European Commission)
A recent study compares the effects of organic, 'natural' fertilisers, such as compost, with mineral, synthetic fertilisers, such as urea, on N2O emissions from Mediterranean soil. It suggests that there is little difference between the fertilisers, but that pig slurry offers the best overall balance in terms of emissions and crop yield.
Nitrous oxide (N2O) is a powerful greenhouse gas (GHG). Although N2O exists in smaller quantities than CO2 in the atmosphere, it is a more powerful GHG. One of its main anthropogenic sources is agricultural soil, the result of applying organic and mineral fertilisers. These fertilisers also produce nitric oxide (NO) which damages the ozone layer.
Previous studies on the effects of applying natural organic and mineral fertilisers on N2O and NO emissions have produced contradictory findings. Emissions are influenced by conditions such as soil type, crop, temperature and water levels in the soil. Research, conducted under the EU NitroEurope project1, investigated the effect of both types of fertiliser on a non-irrigated crop under Mediterranean conditions. It also investigated the effect of the first rainfall events in autumn on changing levels of N2O and NO.
Eighteen 30 m2 plots were selected at a location near Madrid where no crop had been sown and no fertiliser applied in the previous 5 years. Individual plots were treated with four natural organic fertilisers (composts and liquid manures), a mineral fertiliser (urea) and a control treatment without any nitrogen fertiliser. Barley was sown on the same day in each plot. Changes in N2O and NO were measured during the whole experimental period from January to October.
There were no significant differences between the fertilisers and very low emissions were measured for all treatments and throughout the study period. However, to compare, composted, organic municipal solid waste (MSW) produced fewest N2O emissions and composted crop residue with sludge (CCR+S), also a natural organic treatment, produced the least NO. Three of the four natural organic fertilisers (MSW, CCR+S and untreated pig slurry) produced smaller NO emissions than urea, and a NO sink was observed at several points, particularly when soil temperatures were low. The authors suggest that further studies are needed to investigate this process. The research observed brief rises of N2O emissions in autumn when the first rainfall events occur and the dry soil becomes wet.
An emission factor was calculated which related N2O emissions to the amount of barley produced. This indicated that digested pig slurry is the most efficient fertiliser for this type of Mediterranean agrosystem if the aim is to reduce N2O emissions without reducing crop yield. In comparison, composted residues mixed with sewage sludge and urea both had high emissions factors, i.e. it would not be possible to reduce N2O emissions without also reducing crop yield.
1. NitroEurope was supported by the European Commission under the Sixth Framework Programme. See: www.nitroeurope.eu
Source: Meijide, A., García-Torres, L., Arce, A. et al. (2009). Nitrogen oxide emissions affected by organic fertilization in a non-irrigated Mediterranean barley field. Agriculture, Ecosystems and Environment. 132: 106-115.
Contact: ana.meijide@upm.es
A recent study compares the effects of organic, 'natural' fertilisers, such as compost, with mineral, synthetic fertilisers, such as urea, on N2O emissions from Mediterranean soil. It suggests that there is little difference between the fertilisers, but that pig slurry offers the best overall balance in terms of emissions and crop yield.
Nitrous oxide (N2O) is a powerful greenhouse gas (GHG). Although N2O exists in smaller quantities than CO2 in the atmosphere, it is a more powerful GHG. One of its main anthropogenic sources is agricultural soil, the result of applying organic and mineral fertilisers. These fertilisers also produce nitric oxide (NO) which damages the ozone layer.
Previous studies on the effects of applying natural organic and mineral fertilisers on N2O and NO emissions have produced contradictory findings. Emissions are influenced by conditions such as soil type, crop, temperature and water levels in the soil. Research, conducted under the EU NitroEurope project1, investigated the effect of both types of fertiliser on a non-irrigated crop under Mediterranean conditions. It also investigated the effect of the first rainfall events in autumn on changing levels of N2O and NO.
Eighteen 30 m2 plots were selected at a location near Madrid where no crop had been sown and no fertiliser applied in the previous 5 years. Individual plots were treated with four natural organic fertilisers (composts and liquid manures), a mineral fertiliser (urea) and a control treatment without any nitrogen fertiliser. Barley was sown on the same day in each plot. Changes in N2O and NO were measured during the whole experimental period from January to October.
There were no significant differences between the fertilisers and very low emissions were measured for all treatments and throughout the study period. However, to compare, composted, organic municipal solid waste (MSW) produced fewest N2O emissions and composted crop residue with sludge (CCR+S), also a natural organic treatment, produced the least NO. Three of the four natural organic fertilisers (MSW, CCR+S and untreated pig slurry) produced smaller NO emissions than urea, and a NO sink was observed at several points, particularly when soil temperatures were low. The authors suggest that further studies are needed to investigate this process. The research observed brief rises of N2O emissions in autumn when the first rainfall events occur and the dry soil becomes wet.
An emission factor was calculated which related N2O emissions to the amount of barley produced. This indicated that digested pig slurry is the most efficient fertiliser for this type of Mediterranean agrosystem if the aim is to reduce N2O emissions without reducing crop yield. In comparison, composted residues mixed with sewage sludge and urea both had high emissions factors, i.e. it would not be possible to reduce N2O emissions without also reducing crop yield.
1. NitroEurope was supported by the European Commission under the Sixth Framework Programme. See: www.nitroeurope.eu
Source: Meijide, A., García-Torres, L., Arce, A. et al. (2009). Nitrogen oxide emissions affected by organic fertilization in a non-irrigated Mediterranean barley field. Agriculture, Ecosystems and Environment. 132: 106-115.
Contact: ana.meijide@upm.es
6.30.2009
Biowaste management and ISWA's position
This a presentation that outlines ISWA's position paper on the Green Paper for Biowaste Management. It was made during an event organised by the European Economic and Social Counciland the municipality of Salerno, which applies a complete source separation program. The presentation emphasizes the view for biowaste management as well as lessons that have been learned through biowaste management around Europe.
The presentation is available at:
http://www.scribd.com/doc/16952026/Biowaste-Position
The presentation is available at:
http://www.scribd.com/doc/16952026/Biowaste-Position
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