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Sewage sludge stabilization by biomass ash
Pavšič, Primož ...
Sewage sludge, due to the high organic content, presence of pathogenic bacteria and often heavy metals, pose a major environmental problem. Environmentally very demanding is also managing different ...waste ash residues, which some of them were already successfully applied in field of construction.This is not a case for ashes from biomass combustion. By mixing waste biomass ash and biodegradable sewage sludge a composite construction material for specific purposes can be obtained. In view of sustainable development this presents an optimal - zero waste solution. Research has shownthat process of stabilization of sewage sludge, which is a fluid component (it contains minerals calcite, quartz, kaolinite, dolomite and illite), with biomass ash, which contains three active components (free CaO, portlandite and dicalcium silicate), because of the elevated temperature and pH value, effectively inhibit further microbial activity and the associated degradation. In the process a stable matrix is formed, which is in quantity and type of porosity similar to the matrix of lime mortar. In this way a composite building material with compressive strength of 1,5 to 2,5 MPa is produced. This can be used mainly in the area of landfill covers, road shoulders management and stabilizing road base, as well as in rehabilitation of degraded areas. The analysis of the chemical composition of the water eluate from the composite showed, that the new composite material is inert andas such does not pose a threat and do not burden to the environment.
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