Hangzhou Tianziling No.1 MSW Sanitary Landfill Site (hereafter, "Tianziling Landfill")
is a full-scale sanitary landfill of valley type. It serves for the treatment and disposal of municipal solid waste (MSW) of Hangzhou City. Situated in Southeast China on the southern side of the Yangtze River Delta, Hangzhou is a state-level scenic tourist city and a historically and culturally famous city in China. It is a major central city in the Yangtze River Delta and the center of politics, economy, science and education, and culture of Zhejiang Province. It has also been listed among China's model cities in environmental protection.
Tianziling Landfill is the 1st one in China that was constructed and operated according to the national standard "Standard for Pollution Control on the Landfill Site of Municipal Solid Waste" (GB 16889-1997). It is also the 1st landfill that has successfully installed the biogas engines for combined heat and electricity production (CHP) in China.
From April 1999 to December 2005, it has landfilled more than 7 million tons of waste. Tianziling Landfill has an area of 160,000 m2 and a design capacity of 6 million m3. As a valley-type landfill, the lowest and highest points of Tianziling Landfill are 54 m and 165 m above the Yellow Sea level, respectively. The highest layer of landfilled waste is about 50 m.
Besides the sanitary landfill, a full-scale demonstration project for bioreactor landfill is also conducted in Tianziling Landfill site. The practice is initiated for the first time in China to validate the feasibility of applying bioreacoter landfill for the treatment of putrescible waste in developing countries. The project is supported by the National High Technology Research and Development Program of China (863 Program). The bioreactor landfill has a capacity of 100,000 m3 with 4 lifts and an area of about 7000 m2. Six hundreds t/d of MSW were loaded for about half year. It was closed at the end of 2005, and now has been continuously monitored for 22 months.
The bioreactor landfill has two kinds of operation:
1) to recycle aerobically pre-treated leachate into waste layers
2) to irrigate the stabilized leachate into cover soil, where the irrigating pipe is installed under the surface of soil, so-called subsurface irrigation.
