朋友,我任务,望采纳!Montreal Canada: dump park was once Canada is one of the most important quarry, since 1968, the area received 40 million tons of garbage, landfill depth reached 60 meters. In 1995, Montreal, the city government put forward a repair plan, aims to the landfill and converted into a city park. Experts in the litter layer laid a biogas collection network composed of 375 shaft, trash generated biogas suction well, these biogas through 20 km pipe network to the, power plants, to around 12000 households use. In order to prevent rubbish pollution of groundwater, garbage leachate by pump flow pump out about 2500 cubic meters per day, after oxidation pretreatment, again into the sewage pipe and delivery to Montreal city sewage treatment plant for processing. When agreed garbage coverage scheme, the experts in the field of pieces on the ground after a year-long experiment, finally decides the coverage solution, finally to dump coverage of up to 7 layers, the thickness is 1.5 meters. By 2009, has been completed covering 33 hectares, all kinds of vegetation exuberant, pleasant surroundings. According to the plan, by 2020, there will be new green space of the city.