ABSTRAKPenelitian EM4 and MOL for a C/N: Y= 20, Kata kunci : sampah organik rumah tangga, pengomposan, response surfase methodology, rasio C/N. ABSTRACT This research using household organic waste that is a mixture of organic waste from the kitchen and garden with the addition of an activator EM4, MOL and mixed EM4/MOL. The research design used is a combination of volume mix ratio and activator EM4/MOL and the fermentation time. The data results was plotted on a mathematical model and then optimized using the software Statistica 6.0 Response Surface Methodology methods (RSM).The results obtained by use of a mathematical model for the relationship activator combination

Hydrogen energy is environmental-friendly and considered an attractive alternative to fossil fuels. Among the feasible technologies for hydrogen generation, photocatalysis-derived hydrogen from water splitting is considered to be the optimal solution for meeting long-term sustainability and increased energy demands. In this context, various photocatalytic genres are proposed, with metal and carbon-supported photocatalysts demonstrating greater comprehensiveness and potential for addressing solar-driven hydrogen production from water. Several important aspects of the aforementioned photocatalytic genres are reviewed in the present work in an effort to provide pertinent researchers with new horizons for more advanced performance. The review is initiated by introducing the primary principles in photocatalysis, as well as the prerequisites for hydrogen generation from water. The focus then moves to metal-based photocatalysts, where the important features of these materials as photocatalysts are summarized. Related limitations are also discussed, along with the proposed strategies that could potentially mitigate them. Similar systematic summaries are made of knowledge on carbon-based photocatalysts. The review concludes with a discussion of potential future research directions in light of the bottlenecks currently encountered. With the proper research and development, metal-based and carbon-based photocatalysts could produce clean hydrogen from water, thereby fueling global development without causing environmental harm.

ABSTRAKEnergi memiliki peranan penting dalam proses pembangunan yang pada akhirnya untuk mencapai tujuan sosial, ekonomi dan lingkungan untuk serta merupakan pendukung bagi kegiatan ekonomi nasional. Sumber energi terbarukan yang berasal dari pemanfaatan biogas limbah cair kelapa sawit dapat menghasilkan energi listrik yang saat ini banyak bergantung pada generator diesel dengan biaya yang mahal.Limbah cair kelapa sawit (Palm Oil Mill Effluent atau POME) adalah limbah cair yang berminyak dan tidak beracun, berasal dari proses pengolahan minyak kelapa sawit, namun limbah cair tersebut dapat menyebabkan bencana lingkungan apabila tidak dimanfaatkan dan dibuang di kolam terbuka karena akan melepaskan sejumlah besar gas metana dan gas berbahaya lainnya ke udara yang menyebabkan terjadinya emisi gas rumah kaca. Tingginya kandungan Chemical Oxygen Demand (COD) sebesar 50.000-70.000 mg/l dalam limbah cair kelapa sawit memberikan potensi untuk dapat di konversi menjadi listrik dengan menangkap biogas (gas metana) yang dihasilkan melalui serangkaian tahapan proses pemurnian. Di Kabupaten Kotawaringin Timur terdapat 36 Pabrik Pengolahan Kelapa Sawit yang total kapasitas pabriknya adalah sebesar 2.115 TBS/jam, menghasilkan limbah cair sebesar 1.269 ton limbah cari/jam dan mampu menghasilkan 42.300 m3 biogas.Kata kunci: Renewable Energy, Plam Oil Mill Effluent, Chemical Oxygen Demand, Biogass, Methane. ABSTRACTEnergy has an important role in the development process and ultimately to achieve the objectives of social, economic and environment for as well as an environmental support for national economic activity. Renewable energy source derived from wastewater biogas utilization of oil palm can produce electrical energy which is currently heavily dependent on diesel generators at a cost that mahal.Limbah liquid palm oil (Palm Oil Mill Effluent, or POME) is the wastewater that is greasy and non-toxic, derived from the processing of palm oil, but the liquid waste could cause environmental disaster if not used and disposed of in open ponds because it will release large amounts of methane and other harmful gases into the air that cause greenhouse gas emissions. The high content of Chemical Oxygen Demand (COD) of 50000-70000 mg / l in the liquid waste palm oil provides the potential to be converted into electricity by capturing the biogas (methane gas) produced through a series of stages of the purification process. In East Kotawaringin there are 36 palm oil processing factory that total factory capacity is of 2,115 TBS / hour, producing 1,269 tons of liquid waste wastewater / h and is capable of producing 42,300 m3 of biogas.

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The economically feasible study has become an important factor in today's societies due to achieve the well-being of people. The study analyzed the economic perspective of biomass energy from several secondary data locally and globally. The main target of this study aims to explore the economic perspective of biomass energy in Indonesia. The purpose of this study evaluates from many several economic advantages of the utilization of biomass energy such as economic sustainability, and job creation, and the last one is achieving sustainable development goals. Intensive exposure to several analysis factors of the advantages of modern biomass energy that is leading to economically feasible sustainability for the environment and local people in Indonesia. Moreover, it was found that the relationship between biomass energy and sustainable development significantly related to and supported the achievement of United Nation – Sustainable Development Goals (UN SDGs). Based on analyzing the biomass energy and economic strong effect on social development. After this, found significant benefits of biomass energy by creating local income, health care, school, and transportation as well as agriculture. These conclusions are discussed from many literature predictions about the future perspective of the relationship between biomass energy and economics. Recommendations encourage to government, investors, and stakeholders to involve biomass energy which is aim to achieve renewable energy targets. This research will provide more understanding of the several benefits of biomass energy and also to policymakers and investors to the intention of economic growth of biomass energy.