The Swiss have invariably been highly environmentally aware, and for a long time have looked after their environment in an exemplary fashion. The 'Guidelines to waste product control in Switzerland ' ( EKA, 1986 ) were set in 1986, well before many states. One mandatory objective of this as a code of sound practise has been that all waste product management procedures need to provide materials which either are reusable or can be dumped in a rubbish heap without any negative or damaging environmental impact for long-term periods. This type of landfilling would be called 'final storage ' and the wastes in the final storage must naturally by inference have 'final storage quality'. Emissions from a last storage quality dump must be a close fit with the quality in the natural environment without any extra treatment. Another imperative objective of the Swiss waste product control policy is that each generation handles its waste to a standing of last storage quality. So that the reactions in a dump to take it to last storage quality have to be quick enough to all be finished inside thirty years, and ideally less.
As an effect of this policy, has each borough's solid waste landfills been proved to be able to get to the last storage quality within about 30 years after disposal? The final storage concept focuses predominantly on the solid waste itself stabilizing so that the new generation won't have to depend instead on the synthesised or natural barriers round the rubbish heap body, and the answer's a powerful no! The dump body has to reach an 'inert ' state so that the emissions from the rubbish heap have compatibility with the environment for long-term periods regardless of the retardation and attenuation capacities of surrounding materials. But this inactive state depends on geochemical properties of the dump site materials. The concern is that compounds in the inactive dump body may become 'mobile ' when the physical and chemical conditions in the rubbish heap change, and this will continue to be damaging even centuries after the dump was filled and revived.
A correct lining and a correct geological environment are basic absolute must-haves for last storages. They're compulsory for containment, for monitoring and, last although not least, for environmental security reasons.
Ditched in a dump, community solid waste ( MSW ) will at last come into contact water, which enters the rubbish heap continuously thru rain, even after capping as the seal can't ever be perfect over a period of time. As a result of this contact, many chemical and microbiological reactions occur. Natural compounds can be modified to other natural chemicals or inorganic compounds. Inorganic compounds can experience many chemical reactions and can be changed to other inorganic compounds.
The products of these reactions and parts of non-reacted MSW can, and at last will, be transported by leachate and by gas into the encompassing area. In addition, many physical processes, like adsorption, dissolution, rain, etc, can occur simultaneously. a MSW rubbish heap can be accepted as a 'partly continued chemical and microbiological fixed bed reactor'. Now that isn't a great thing to have in communication with groundwater which should regularly later be used as drinking water. It is also regarded as therapy facility where the target it is to get it to self-treat to a rubbish heap body of last storage quality. Major research and monitoring of landfills is a new development, controlled landfills having existed for 20 years or so already.
The present controlled landfills so are still in the exhaustive reactor phase in which radical microbiological decompositions occur.
The behavior of landfills in this period can be considered roughly properly using current models. But no experience exists regarding the long term behavior ( over even 30 years ) of MSW landfills. Thanks to the highly difficult nature of the systems, a specific prediction of long-term behavior of MSW landfills is almost impossible. So it's no exaggeration to claim that long-term leachate emissions from city solid waste landfills are unknown, and yet all across the globe each day, new and larger landfills are being built and stuffed with waste. It's all a big experiment and science hasn't determined the result. Even the Swiss, who are possibly some the most responsible guardians of the environment in the world have fallen far short of their 1986 ideals.
How can we be so complacent? Shouldn't we all be worried?
Article is based upon the paper "Long-Term Leachate Emissions from Municipal Solid Waste Landfills, Hasan Belevi and Peter Baccini, Switzerland, presented at the International Symposia on Sanitary Landfills held in Sardinia (Italy)"
Many people find this fact to be of great concern. Is all of landfilling just a huge experiment which might cause huge problems in the future? Part 2 of this article is available were we further discuss landfill final storage quality. Go there now to read more!
