Judul: Konsep Eco-Agroindustrial Estate di Kalimantan Tengah: Pembangkit Listrik Tenaga Biogas
Abstrak: The government plans to develop a food barn in Central Kalimantan to anticipate the food crisis and improve food security. The concept of eco-agroindustrial estate aims to formulate the concept of land use as an integrated area to be applied in Central Kalimantan, which can produce various agricultural commodities, livestock, fisheries, and other supporting commodities to achieve the function as a food barn efficiently. This concept uses an industrial ecology approach that forms a closed-loop system in minimizing waste generation and external inputs. This research is part of the eco-agroindustrial estate concept that utilizes livestock waste and converts it into energy and fertilizer. The biogas generation plant unit treats 360 tons of cow manure, generating 10630 kWh of electricity, 24 tons of solid fertilizer, and 170 m3 of liquid fertilizer. This power plant shows technically and technologically feasible results, financially viable with an R/C ratio of 1.8, and environmentally sound with methane mitigation of 20,664 Mt CO2-eq. This concept offers social, economic, and environmentall benefits. This concept also contributes to the Sustainable Development Goals, namely goals number 2, 5, 6, 7, 8, 9, 12, 13, and 15., Pemerintah berencana membangun lumbung pangan di Kalimantan Tengah untuk mengantisipasi krisis pangan dan meningkatkan ketahanan pangan. Konsep eco-agroindustrial estate bertujuan untuk merumuskan konsep penggunaan lahan sebagai kawasan terpadu untuk diterapkan di Kalimantan Tengah, yang dapat menghasilkan berbagai komoditas pertanian, peternakan, perikanan, dan komoditas pendukung lainnya untuk mencapai fungsi sebagai lumbung pangan secara efisien. Konsep ini menggunakan pendekatan ekologi industri yang membentuk sistem loop tertutup dalam meminimalkan timbulan sampah dan input eksternal. Penelitian ini merupakan bagian dari konsep eco-agroindustrial estate yang memanfaatkan limbah ternak dan mengubahnya menjadi energi dan pupuk. Unit pembangkit biogas mengolah 360ton kotoran sapi, menghasilkan listrik 10630 kWh, 24ton pupuk padat, dan 170 m3 pupuk cair. Pembangkit listrik ini menunjukkan hasil yang layak secara teknis dan teknologi, layak secara finansial dengan rasio R/C 1,8, dan berwawasan lingkungan dengan mitigasi metana sebesar 20.664 Mt CO2-eq. Konsep ini menawarkan manfaat sosial, ekonomi, dan lingkungan. Konsep ini juga berkontribusi pada Tujuan Pembangunan Berkelanjutan, yaitu tujuan nomor 2, 5, 6, 7, 8, 9, 12, 13, dan 15.
Keyword: Central Kalimantan, closed loop system, eco-agroindustrial estate, food estate

Judul: Konsep Eco-Agroindustrial Estate di Kalimantan Tengah: Industri Mocaf dan Tahu
Abstrak: The increase in population that is not followed by an increase in food production and distribution capacity causes instability between national food demand and supply which in turn triggers the issue of national food security. One of the efforts that can be made as a contribution to the realization of food security is the development of food estate. To achieve success in the food estate program, the right concept is needed so that the program can be realized as planned. The objective of this study is to formulate the concept of an eco-agroindustrial estate in Central Kalimantan as an alternative land use into an integrated area to produce various agricultural commodities that contribute to achieving national food security, with focusing on integrated mocaf and tofu industry. The research is conducted using descriptive research method with qualitative and quantitative data obtained from the results of previous research literature studies. Central Kalimantan is considered as a good area for developing an eco-agroindustrial estate including rice milling industry, dry shelled corn and milled corn industry, mocaf industry, tofu industry, beef cattle industry, catfish cultivation and processing industry, biomass power plant, and biogas power plant. These industries form a closed loop system and feasible technically and technologically, financially, and environmentally.
Keyword: Central Kalimantan, eco-agroindustrial estate, mocaf industry, tofu industry, closed loop system, industrial ecology

Judul: Characterizations of low alloy steel sae 4422  plated with chromic acid (Cro3)
Abstrak: Characterizations of low alloy steel SAE 4422 plated with chromic acid (CrOrO3) was use Optical Microscopy (OM), Scanning Electron Microscopy (SEM), X-Ray Diffraction (XRD), RD),Energy Dispersive Analysis of X-Ray (EDAX), Hardness Test and Roughness Test. Microstructures analysis exhibits cracks and grain boundaries microcracks as a characteristics of chrome metal found at plating metal. Perlite and Ferrite as grains of steel found at base metal with grain boundaries around it. Phase analysis of plating metal appropriate to chrome metal with lattice constant (a) is 2.559 Å and phase analysis of base metal appropriate to iron ferrite with lattice constant (a) is 3.318 Å. Both plating and base metal have cubic system. Chemical analysis of plating metal at surface section exhibits that cracks area have highest value of carbon element compare with grains and grains boundaries area. While chemical analysis of base metal at cross section exhibits that perlite have highest value of carbon element compare with ferrite and grain boundaries. The hardness value of plating metal at surface section and cross section are 753 and 637 VHN. While, the hardness value of base metal and interface area at cross section are 205 and 373 VHN. The roughness value at measurement points of chrome surface for as received sample are 0.445 μm. Observation used Optical Microscopy and Scanning Electron Microscopy exhibits surface irregularities combine to form surface texture of plating metal at surface section.
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