Tuesday 6th - Session G (Pineta Room)

- 9:00 - 10:40
Workshop: Industrial waste management: new opportunities
Chair: E. Gidarakos (GR)

Industrial waste production is significantly larger than Municipal Solid Waste (MSW) production. In some cases, industrial wastes can contain and release pollutants that are potentially harmful to the environment and population therefore they are considered as hazardous waste. In the past, the inadequate management and disposal of such waste has caused severe environmental impacts, and continues to be so today in some cases (particularly in developing countries).
 Over time, industrial waste has come to be viewed as a potential source for industry, and now it has been included in the concept of urban mining: also industrial residues should be minimized, reused and recycled before handling and treatment prior to final disposal.

10:40 - 11:10 Coffee break

- 11:10 - 12:50
Workshop: Leaching tests in decision making
Chairs: H.A. van der Sloot (NL), D. Kosson (US)

When considering long-term impacts from either landfilling or beneficial use, the major concern will be on heavy metals and persistent organic contaminants. For an MSW landfill, the gas emissions are a relatively short term issue, whereas leaching of inorganic and persistent organic contaminants from MSW will continue for a long time and hence potentially poses significant long-term risk. Recent regulatory developments focus on release from construction products, which more and more are produced with alternative materials used as coarse and fine aggregates, fillers, etc. In many cases such alternative materials were formerly waste materials. Therefore alternative materials are judged for their hazardous nature in the EU (Hazardous Waste Directive) and by options to classify waste as non-critical by End-of-Waste criteria. Products produced with alternative materials need to be considered based on their environmental performance, as well as their technical performance.  Recently adopted leaching test methods in US EPA and EU ( CEN, Waste and Construction) in combination with a sophisticated geochemical modelling tools allow a more integrated evaluation of long-term release behaviour taking changes in material behaviour due to external influences (organic matter interaction, carbonation, oxidation,..) into account.

12:50 - 15:30 Lunch break

- 15:30 - 17:10
IWWG Workshop: Aftercare completion decision making
Chair: H. Scharff (NL)

Aftercare completion is the moment at which a landfill site can be considered functionally stable, thus entering post-regulatory minimal care. From that moment, the remaining risk and emission potential is transferred from the landfill operator to the society.
The main issue is represented by the difficulty to use available data to predict stability of waste in the landfill body after completion, due to changes (e.g. build-up of a leachate table in the site) which may invalidate models used.
The workshop will consist of short and focused presentations, aimed to better understand the role of assessment of long-term emissions, including data needed and criteria to be used for a further development in completion procedures.

Introductory lectures:

O. Hjelmar (DK)
The need for a site-specific risk-based approach
A. Van Zomeren (NL)
Site-specific criteria for three Dutch landfills
T. Heimovaara (NL)
Relevant questions for completion procedures

17:10 - 17:40 Coffee Break
17:40 - 18:00 Poster discussion

- 18:00 - 19:40
Workshop: Longterm waste data management
Chair: Howard Robinson (GB)

The extended periods of time over which putrescible landfill sites need to be managed means that data and information relating to the sites have to be passed to successive future generations. Among the topics to consider is the media used to store information. Modern paper and inks have a short life, and paper records are vulnerable as well as expensive to store. Electronic storage would seem a cost effective way to pass on site histories, but this brings with it concerns about formats, security and protection. In addition, completely electronic management of (for example) analytical data can easily lead to inadequate routine scrutiny of those results, although on the other hand, use of “trigger values” can rapidly bring non-compliances to the attention of an operator. There are currently no standards or guidelines on how information should be collected, stored and made available in the future and this workshop provides an opportunity to discuss the issues involved, which have wider application to data management for all waste installations.

Introductory lectures:

K. Wilson (GB)
Closed landfill sites – Managing the information legacy