Pengkajian Unjuk Kerja Komponen Near Surface Disposal: Cover untuk Demoplant Disposal

Abstract

STUDY OF PERFORMANCE ASSESSMENT OF NEAR SURFACE DISPOSALCOMPONENT: COVER FOR DEMOPLANT DISPOSAL. Near Surface Disposal (NSD) has threecomponents as main barrier system such as waste package, site and disposal facilities. At thisyear, study of cover performance as part of the engineering barrier system in the NSD disposalfacilities has been conducted for recommendation suit cover in the Demoplant Disposal facilities.Method of work is description method by literature study, gathering information about variousdisposal type that has been applied in another countries with the purpose to obtain supporting datain the development of Demoplant NSD in Serpong Nuclear Zone. Performance assessment ofcover has been analysed by software HELP version 3.07 with weather data based on Serpong areaand using default soil texture from database. Serpong Nuclear Zone are an area that has fairly highrainfall and the site of Demoplant NSD are located in SP4 with an area 6.300 m2 that having aslope area in the west side of Demoplant NSD site. So that recommendation for cover type is multilayeredcover with dome type design (slope 2-3 %) that accompanied with drainage system. Covermaterial consists of vertical percolation layer that also as protection layer (consists of vegetatedsoil, coarse rock and gravel), two drainage layer (primer and secondary consists of sand layer) thatseparated by membran liner, and barrier layer that is low-impermeability material such as bentoniteor clays.Keywords: Near Surface Disposal, cover, engineering barrier, hydrologic. ENGKAJIAN UNJUK KERJA KOMPONEN NEAR SURFACE DISPOSAL: COVER UNTUKDEMOPLANT DISPOSAL. Near Surface Disposal (NSD) memiliki tiga komponen barrier utamayaitu kemasan limbah, tapak dan fasilitas disposal. Pada tahun ini telah dilakukan pengkajian unjukkerja cover sebagai bagian dari penghalang teknis pada fasilitas disposal NSD untuk rekomendasicover fasilitas Demoplant Disposal. Metode yang diterapkan adalah metode deskripsi dengan carapenelusuran pustaka, mengumpulkan informasi tentang berbagai tipe disposal dari negara laindengan tujuan mendapatkan data untuk mendukung pembangunan Demoplant NSD di IPLRKawasan Nuklir Serpong. Analisis unjuk kerja cover menggunakan perangkat lunak HELP(Hydrologic Evaluation of Landfill Performance) versi 3.07 dengan basis data cuaca Serpong dankarakteristik tanah default perangkat lunak. Kawasan Nuklir Serpong merupakan daerah yang memiliki curah hujan yang cukup tinggi dan lokasi calon Demoplant NSD terletak di SP4 denganluas area 6.300 m2 dan memiliki kemiringan lereng di bagian Barat sehingga rekomendasi tipecover yaitu multi-layered cover dengan bentuk desain berupa Kubah (slope 2-3 %) disertai dengansistem drainase. Komponen cover terdiri dari layer resapan yang juga berfungsi sebagai layerproteksi biologis berupa vegetasi dengan tanah, batuan dan kerikil, dua layer drainasi (primer dansekunder berupa lapisan pasir) yang dipisahkan oleh layer membran, dan layer barrier denganimpermeabilitas rendah berupa lempung atau bentonit terkompaksi