Reuse of wastewater sludge with marine clay as a new resource of construction aggregates
Journal
Water Science and Technology
Journal Volume
50
Journal Issue
9
Pages
189-196
Date Issued
2004
Author(s)
Abstract
The disposal of sludge from wastewater treatment presents highly complex problems to any municipality. Most of the sludge disposal methods have varying degrees of environmental impact. Hence, it is necessary to explore potential areas of reuse in order to alleviate sludge disposal problems and to conserve natural resources. Industrial sludge and marine clay are two forms of high-volume wastes. Using these wastes as a resource of raw materials to produce construction aggregates would enable large-scale sludge reuse. The aggregates were produced at various sludge-clay combinations containing 0, 20, 50, 80 and 100% clay contents, respectively. The pelletized aggregates displayed lower particle densities ranged between 1.48 and 2.25 g/cm3, compared to the density of granite at 2.56 g/cm3. Good 28-day concrete compressive strength of 38.5 N/mm2 achieved by the 100% sludge aggregate was comparable to the value of 38.0 N/mm2 achieved of the granite control specimens. The leachate contamination levels from the aggregates after 150 days were found acceptable when used in concrete, indicating insignificant environmental contamination. The heat flow study showed increases in heat flow at the temperatures of 480¢XC and between 660¢XC and 900¢XC, indicating a need for the extension of heating time around these temperatures. ? IWA Publishing 2004.
Subjects
Clay
Construction aggregates and utilization
Sintered
Sludge
Other Subjects
Clay; Compressive strength; Concrete aggregates; Contamination; Environmental impact; Granite; Heating; Natural resources; Reusability; Waste disposal; Wastewater treatment; Leachate contamination levels; Municipality; Pelletized aggregates; Sewage sludge; Clay; Recycling; sludge; Waste disposal; Wastewater treatment; article; building material; chemical analysis; clay; contamination; controlled study; environmental impact; environmental protection; feasibility study; heating; industrial sludge; leaching; marine environment; physical chemistry; recycling; sludge treatment; temperature dependence; waste water management
Type
journal article