Industry experts and IIT-Delhi representatives, on September 7, 2017, made a presentation on a permanent solution for the mountains of garbage at three landfill sites in the city, before Lt Governor Anil Baijal and chief minister Arvind Kejriwal. The presenation was made at a meeting convened by the L-G, to discuss solutions for the Ghazipur, Bhalswa and Okhla landfills.
In the deliberations about the mounds at Bhalswa and Okhla, it was decided to undertake their greening, after grading their slopes in an engineered manner, the L-G’s office said in a statement. The statement also said that work at all the three sites would be carried out under the guidance of experts, to take care of any contingencies and long-term effects.
In the meeting, professor Manoj Datta of IIT explained measures for improvement of stability of the garbage mounds, such as flattening the slope and removing leachate (the liquid that drains or ‘leaches’ from a landfill) and gas. Case studies from Gorai (Maharashtra), Vapi (Gujarat) and Hyderabad (Telangana) were demonstrated. “The issue of emission control and the need to eliminate fires, were also deliberated. It was apprised to the L-G that a five-layer impervious cover/cap could be provided, besides removal of leachate and gas through drains and wells. Fires can be eliminated by collecting and flaring inflammable methane,” the statement said.
Regarding the aesthetics of the landfill sites, it was suggested that the garbage slopes could be re-graded and green vegetative growth engineered. The normal time frame to implement such measures, which are also quite expensive, range from nine months to 18 months, depending upon site conditions and clearances.
The Delhi Jal Board CEO talked about possible solutions, for efficient forms of disposal of silt such as stocking it in geo-tubes and de-watering it along the banks of the existing major drains. The L-G directed him to consult with NEERI (National Environmental Engineering Research Institute) and other experts on this front and come up with firm proposals.
Earlier this week, Baijal had directed municipal corporations to increase the capacity of their existing waste to energy plants and clear the garbage at Ghazipur landfill site, within two years beginning November, 2017. The direction had come had come after a portion of the waste dump, estimated to be as high as a 15-storey building, collapsed on September 1, 2017, killing two persons.