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process for recovery of humic substances by leachate from landfill of municipal solid waste or similar smoking process and substance obtained by the process.
process for recovery of humic substances by leachate from landfill of municipal solid waste or similar smoking process and substance obtained by the process.
A process for recovering humic substances from percolate originating from urban solid refuse dumps or the like during the maturation stage with pH between 7.0 and 10.0, characterised by: - subjecting the percolate to an evaporation-concentration stage at a temperature between 50 and 1 30°C and a pressure between 5 and 200 kPa, - subjecting the concentrated percolate containing the substances in solution to an acidification stage with inorganic acid to a pH between 1 and 3 to obtain precipitation of humic substances in the form of flocky solid, - separating the flocky humic substance solid from the liquid phase to obtain crude humic substances.
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