The application of carbonization or carbonization model technology to reactor equipment uses a closed method. The purpose of using a closed system is to produce high quality carbon which is shiny black in nature and breaks easily when pressed with the thumb. This technological method is very practical for the community to apply both in the manufacture of reactors and the carbonization process to the manufacture of charcoal briquettes. The reactor can be made from used compressor cylinders or 12 kg gas cylinders. The material is then modified into a reactor device where combustion is carried out in the reactor tube. In the process of carbonizing biomass, neither agricultural nor industrial waste needs to wait until it turns into carbon, in this case black granules. In this training, participants were first provided with theory and explanations about the use of reactor tubes starting from the manufacturing process to carbon production. In making briquettes, several stages are carried out, including drying, waste sorting, carbonization, mixing with adhesive to printing with a briquette size of 3.18 cm and drying using an oven or sun. so that participants can practice at home. This training can provide skills to the participants, as well as open the mindset of how to use the waste around it to be used as a solid alternative fuel. It can also be used as a home industry business so that it can improve the household economy.

The removal of alkaline chemicals, particulates, and other impurities from syngas is a challenge in the biomass gasification process. Wet scrubbers are frequently used to clean the industrial exhaust gases before being released into the atmosphere. Cleaning fluid is sprayed or pumped through the apertures and comes in touch with the gas to be cleaned of most wet scrubbers. Therefore, this paper proposes a new technology that uses a bubble wet scrubber system to flow syngas at a constant height into a pool of cleaning water. The syngas will come into direct contact with the cleaning water to form bubbles containing gas and other impurities that are absorbed mostly by the cleaning water. The objective of this study is to develop a simple and cost-effective bubble system scrubber and investigate its impact on the scrubber's performance for tar removal from biomass gasification. The results show that 2.6 L of cleaning water can remove particles and tar from syngas with an 83.26% efficiency.

Technological advances in material aspects are always increasing, and one of the applications of natural fibers as a matrix in composite materials has begun to be widely used. Composite materials have mechanical properties that are sturdy, corrosion resistant, and concise, and can be used as a substitute for metal materials. Areca palm fronds are part of the areca palm tree which are widely used as storage media because they are durable and weather resistant. The aim of this study was to determine the tensile strength of areca nut composites without alkali treatment combined with epoxy. Tensile test based on ASTM D3039 test standard. The test results showed a maximum tensile strength of 4839886.67 N/m2 or 4.84 MPa, and a modulus of elasticity of 114148270.5 N/m2 or 114.15 MPa. According to the JIS A 5905 standard, it meets the specified requirements, namely elastic strength of 32 MPa and tensile strength of 0.4 MPa.