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New Waste Concepts' Spectrum of
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- What are
the health and safety issues that
need to be addressed in using leachate
as a blending medium, and as a
result, what are the health protocols
that should be adopted.
- For states
that were still managing their
landfills under the 'Dry
Tomb" theory
and not allowing recirculation
of leachate, NWC had to prove that
using leachate was not adding back
water or leachate to the landfill,
or what would be technically classified
as recirculation.
- What are
the benefits of using leachate,
if any
- What are
Open Document 3-1, which includes: (828 kb PDF download)
- Minnesota
Pollution Control Agency Approval
Letter
- NWC
suggested protocol – blending
leachate w/ Concover Analysis
- Nutrient
Blanket vs Recycling of Leachate Analysis
- Excel
Spreadsheet showing savings Analysis
- Jones
and Henry Paint Filter Test Lab
results
- NWC position paper – leachate use for bio-stabilization Analysis
Controlled Leachate Recirculation
World Symposium Paper presented 1993
Open Document 3-3 (127 kb download)
Risk Based Model for Landfill Employees
Study & Analysis 2001
The state of Minnesota is one of the few states which has required not only a study but the development of a health protocol to ensure worker safety. Hull and Associates, an independent engineering firm was hired to develop a Risked Based Health Evaluation Model to assess risk to employees based upon the chemical and organic constituency of the landfills leachate for NWC and its landfill customer base in Minnesota. Of particular importance to the health of the workers when spraying NWC's spectrum of cover materials is its viscosity, which limits the droplets sizes that can be inhaled.
Further, because of the viscosity, when the ConCover materials are added to an odorous tank of leachate, the free waters are locked up by the polymers thus limiting evaporation and the escaping of the odor molecules into the atmosphere. It is readily apparent to the nose when ConCover materials are added to a tank as the odor drops immediately as the polymers unfold.
The economic benefit of using leachate is found largely in cost avoidance arising out of not having to treat the leachate which is used as a blending medium. The water and thus, the leachate evaporates off the surface as the cover materials dry. Thus, the leachate is not added back to the landfill. Attached to this package is part of a financial analysis using the cost of the machine that applies the ConCover materials, as well as the operating costs (fuel, maintenance, labor and depreciation) to determine the annual operating and life cycle cost for a landfill that operates a 1000 square meter working face. The annual savings by using leachate for this small landfill would be nearly 50% of the annual operating costs. On a daily basis, the savings was nearly a cubic meter of leachate per day. For larger sites the savings could be even higher since the tank size could be upwards of 13,000 liters or 13 cubic meters of leachate per day savings.
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