In 1998, after the government officially closed the landfill, the first challenge was to contain the waste. The slopes and walls of the mountain were stabilized and reinforced using salvaged concrete debris from construction projects. Then the landfill was capped and covered, which allows Ayalon Biogas to collect methane produced by the still rotting garbage, which is used to power a textile factory.

via Tel Aviv’s Hiriya “trash mountain” transformed into Israel’s “Central Park” : TreeHugger.