| 摘要 |
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. |
