The presence of heavy metals in surface water, which is common in mining area pose harmful effect to human health and the environment. Recently, cocopeat has been studied as an effective sorbent material for removing heavy metals from wastewater. In this study, kinetic was done by analyzing the distribution of the heavy metal in sorbent material and liquid phase after mixing 50 mg/L solution of lead (Pb2+) and zinc (Zn2+)in single solute system with 0.1 g of coco-peat, that were consequently shaken at 5, 10, 15, 30, 60, 120, 180 and 360 minutes. To determine the equilibrium adsorption isotherm for each heavy metal, the solutions of 10, 20, 30,40 and 50 mg/L of Pb2+ and Zn2+ were prepared separately. Two different pH levels (natural pH, and pH 4) were setto describe the sorption behavior of Pb2+ and Zn2+ of each heavy metal.Using data from batch experiments, appropriate kinetic (time dependency) and equilibrium (isotherm) models were fitted on the sorbent material and liquid phase concentrations to determine adsorption parameters. Pseudo second-order kinetic model fitted well to the kinetic data due to chemisorption that happened during experiments. In other hand, Langmuir model fitted well to the equilibrium, this indicates that the sorption of lead and zinc on coco peat is monolayer and that the adsorbent’s surface is homogenous. The increase of heavy metals adsorption following the increase of pH might be due to negative charge of coco peat surface. Pb2+ adsorbed more than Zn2+ because ion with high hydration enthalpy will have smaller amount of ion adsorbed. The hydration enthalpies for Pb2+ and Zn2+ are 23 kJ/kg and 113 kJ/kg, receptively. Considering all the factors that we have discussed, cocopeat has high efficiency to remove the heavy metals from wastewater. Keywords: Coco-peat, adsorption, batch experiment, kinetic, equilibrium.

The problem is the difficulty in determining the type and method of manufacture and installation of foundation on soft soils. The research objective is to provide an overview of the type of foundation, the method of manufacture and the method of installation of the foundation which is suitable and suitable in the soft soil environment. This research method uses used research methods with trial and error, and with a case study approach method, namely the case of difficulties in overcoming the problem of the availability of permanent structural support foundations and refinery operation equipment on soft soil. The results showed that the type and shape of the foundation that is suitable and to solve the problem is the foundation behind the box. This foundation specification is an inverted box with reinforced concrete material and certain dimensions with cover plates. The results of this used research also show that the inverted box type of foundation is suitable for supporting equipment supporting refinery operations such as pipe supports and other refinery operation equipment.

Hipotesa lempeng tektonik memberikan wawasan baru tentang interpretasi sejarah geomorfik Kabupaten Banjarnegara, Jawa Tengah, Indonesia. Bentang alam adalah akibat dari proses endogenik dan eksogenik. Peristiwa tersebut terjadi di daerah aktif tektonik, di mana proses tektonik mengakibatkan adanya pengangkatan dan pembentukan relief, sementara erosi bertanggung jawab atas penggundulan bantuan. Morfologi pada daerah penelitian dikelompokkan menjadi undulating hill step dan undulating hills. Berdasarkan geologi regional, wilayah penelitian termasuk pada struktur tektonik dan geologi yang kompleks. Dengan demikian, proses terbentuk akibat dari deformasi litologi seperti kompleks Melange dan struktur regional mayoritas dari arah Barat Laut ke Tenggara.

Lapangan Teapot Dome berada di Wyoming Tengah, Amerika Serikat. Lapangan ini tercatat sebagai 100 lapangan penghasil minyak terbesar di Amerika Serikat dengan cadangan yang terbukti sebesar 42.515.000 barrel. Lapangan ini berada dekat dengan tepi barat daya Cekungan Powder River. Bagian terdalam dari Cekungan Powder River terdiri dari hampir 5.500 meter batuan sedimen, dan sekitar 2.440 meter dari sedimen tersebut merupakan sedimen non marin yang berumur Kapur Akhir dan batuan sedimen klastik Tersier yang berhubungan dengan Orogenesis Laramide. Penelitian ini difokuskan pada bagian Pennsylvanian, khususnya pada bagian Top Sand B. Lapisan ini merupakan lapisan batupasir yang cukup tebal dengan Eolian Dunes. Pemetaan yang dilakukan ini untuk mengetahui sebaran reservoir batupasir pada Top Sand B dengan analisis atribut seismik menggunakan atribut instantaneous frequency dengan menggunakan data seismik 3D Post Stack Time Migration dengan menggunakan 3 sumur sebagai pengontrol untuk formasi dan kedalaman. Berdasarkan hasil analisis atribut seismik menunjukkan bahwa atribut instantaneous frequency dapat menggambarkan sebaran reservoir batupasir pada bagian Top Sand B dengan perubahan yang dapat dilihat berdasarkan perubahan warna dalam bentuk peta. Dengan dominasi persebaran batupasir berada di wilayah bagian selatan Lapangan Teapot Dome. Hal ini juga dipengaruhi oleh struktur patahan pada Formasi Tensleep.