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"To analyze the stability of landfill waste, it is necessary to know the geotechnical characteristics of the solid waste material, especially the parameters related to the stability calculation such as the strength parameters (cohesion and friction angle). The physical properties of the materials are also important, as well as the composition of the waste. This study conducts laboratory and field tests to obtain the aforementioned characteristics from a typical urban landfill in Indonesia. The case study is taken to be the TPST Bantargebang landfill. Due to the difficulties in obtaining an undisturbed sample from landfill waste, a laboratory test was conducted using artificial solid waste samples. The strength parameters of the artificial waste samples were determined using a direct shear test. Besides the laboratory test, field tests (cone penetration test (CPT) and dynamic cone penetrometer test (DCPT)) were also conducted on the closed landfill zones in TPST Bantargebang to obtain the typical bearing capacity of the fill materials. The results of the direct shear test show that the cohesion value of the waste material aligns with the initial compression: higher compression results in higher cohesion, while the contrary applies to the friction angle. The cohesion values range from 0 to 41 kPa, and the friction angle ranges from 0 to 26°. The cone resistance value (qc) up to a depth of 10 m is in the range of 2 to 10 MPa. The equivalent CBR (California Bearing Ratio) value from the DCPT ranges from 4% to 21%. Despite the large variability of the bearing capacity at the top layers, as shown by the DCPT results, the CPT results in the field reveal that the bearing capacity (also the strength characteristics) of the waste materials shows linear increase in line with the depth."

"This research was carried out to investigate the efficiencies of leachate treatment by usingsubsurface flow constructed wetland (CW) with low permeable reactive media and guinea grass(Panicum maximum TD 58). Pilot scale CW was examined at hydraulic loading rate (HLR) of0.028 m/d and hydraulic retention time (HRT) of 10 d. Two different types of media in CW wereused i.e. system 1: clay and sand mixture at ratio of 40:60 (%w/W) and system 2: clay, iron sludgeand sand mixture at ratio of 30: 10:60 (%w/w). The results showed that the performance of system 2was better in terms of pollutant removal efficiencies. Average BOD, COD and TKN removals were76.1, 68.5 and 73.5% respectively. Methane, carbon dioxide and nitrous oxide emissions during thetreatment of CW were 23.2-52.1, 69.1-601.8 and 0.04-0.99 mymzd respectively. The use of CWwith reactive media in system 2 and vegetation resulted in lower GHG emissions. The results showthat CW with low permeable reactive media could be effectively used to remediate leachate fromthe landfill site."

"Tempat Pembuangan Akhir (TPA) adalah salah satu layanan yang harus selalu beroperasi dalam suatu kota. Operasi TPA yang baik dan benar dimulai dari pemahaman dan persepsi pekerja terhadap risiko yang mungkin terjadi. Penelitian ini bertujuan untuk mengetahui persepsi pekerja terhadap risiko sampah longsor di TPA X dan faktor-faktor yang mempengaruhi persepsi tersebut. Dari hasil penelitian dapat disimpulkan bahwa yang mempengaruhi persepsi pekerja terhadap risiko sampah longsor adalah kelompok pekerja, pendidikan terakhir pekerja, dan masa kerja pekerja. Disarankan agar menajemen memberikan penyegaran kembali kepada pekerja tentang risiko yan gmungkin timbul dalam operasi TPA sehari-hari.

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Landfill is one of services that has to be done every day in the city. The right operation of landfill begin from the perception of the workers about risk that can be happened on landfill. The goal of this research is to find out perception from the workers about solid waste slide risk and factors that affect that perception. The conclusion of this research that influence the workers about the perception of wate slide risk are worker group, level of education, and period of work. Suggestion from this research is the landfill management should refresh the workers about the risk inseide landfill including of solid slide risk."