Construction and demolition debris (CDD) and gypsiferous soils
contain elevated concentrations of sulfate which can cause several
environmental and agricultural problems. Reduction of the sulfate
content of CDD and gypsiferous soils is an option to overcome these
problems. This study aimed to develop sulfate removal systems
either by biological or chemical processes to reduce the sulfate
content of CDD and gypsiferous soils in order to decrease the
amount of solid wastes and to improve the quality of CDD and soils
for recycling purposes or agricultural applications. The treatment
concept leaches the gypsum contained in the CDD by water. The
sulfate containing leachate is further treated and reused in the
leaching step. A mixture of cheap organic materials can be utilized
as electron donor for the biological sulfate reduction step,
especially in gypsiferous soils treatment. The sulfide containing
effluent from the bioreactor can be removed by electrochemical
sulfide oxidation system.
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