Abstract
This paper undertakes an assessment of the impact of a mineral-organic composite on the environment as well as the potential for its application for land rehabilitation purposes. The analysis involves the release of the leachable contaminations from the material subjected to testing. This material was formed by a composite manufactured on the basis of communal bottom ash and stabilized sewage sludge. The sludge resulting from wastewater treatment was subjected to stabilization and dehydration in waste pounds at the phase of pre-watering until 20% of dry mass is obtained. Subsequently, they were mixed with bottom ash, which was obtained from selective waste collection, in a 1:1 mass ratio. The analysis involved the leaching of inorganic contaminants in the form of heavy metals, sulphates (VI), chlorides, and fluorides as well as organic compounds in the form of organic carbon solution under the effect of leachant with a various level of pH. The analysed components were characterized by various leaching behaviour depending on the leachant pH. On the basis of the results, it was able to assess the potential hazard posed by the examined material on the environment as a consequence of its application for landfill area rehabilitation.
Highlights
The landfill rehabilitation process is the restoration or reallocation of the utility value to degraded land as a result of the deposition of waste, through proper land formation, improvement of chemical and physical properties, restoration of soil and regulation of proper water relations [1]
Reclamation works are the final stage of the operation and the day of completion of rehabilitation process is the same day that the landfill is closed
Sewage sludge for many wastewater treatment plants and municipal facilities become a problem in terms of their disposal [17]
Summary
The landfill rehabilitation process is the restoration or reallocation of the utility value to degraded land as a result of the deposition of waste, through proper land formation, improvement of chemical and physical properties, restoration of soil and regulation of proper water relations [1]. Rehabilitation of the landfill can be carried out in the technical, biological or target site management. The use of sewage sludge as a reclamation material gives the municipal utilities the ability to manage this type of waste by own means. Likewise, this action is most desirable in waste management, where direct storage of unprocessed sewage sludge is not permitted [6]
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