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All Journal Barometer Industrika : Jurnal Ilmiah Teknik Industri
Malisi, Sibro
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Control & Systems Engineering Decision Sciences, Operations Research & Management Economics, Econometrics & Finance Engineering Industrial & Manufacturing Engineering

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BIODELIGNIFICATION OF AGRO-INDUSTRIAL WASTE AS THE SUBSTRATE TO PRODUCE LACCASE ENZYME FROM TRAMETES VERSICOLOR Perdani, Meka Saima; Malisi, Sibro; Putri, Dwini Normayulisa; Margaretha, Grace; Hermansyah, Heri
BAROMETER Vol 9 No 1 (2024): Barometer
Publisher : Fakultas Teknik, Universitas Singaperbangsa Karawang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.35261/barometer.v9i1.11018

Abstract

Agro-industrial waste in Indonesia is a significant problem for the environment. Optimization of agro-industrial waste utilization is an exciting thing to be researched further. This study aims to utilize agro-industrial waste to optimize laccase enzyme production. The agro-industrial waste used is in the form of bagasse, rice straw, and corn stalks. The waste is used as biomass and treated to extract cellulose through bio-delignification. Cellulose serves as a substrate substance in the production of laccase enzymes. Laccase enzymes can be applied as a biocatalyst in the environmental, pharmaceutical, and chemical industries. Cellulose from agroindustry waste was synthesized by heat treatment using steam explosion with the operation conditions 200°C and 10 bar for 10 minutes. The production of laccase enzymes was done using the green technology submerged fermentation method for 32 hours at 25°C. The optimal result in producing laccase enzyme is using substrate from corn stalks and adding nutrients with an activity value of 25.46 U/mL. The reaction kinetics of laccase enzyme and commercial enzyme against 0.1 M substrate were modelled using the Euler method, and the k value was 2x10-4 min-1 (crude laccase) and 1.9x10-2 min-1 (commercial laccase).
Penerapan Economic Order Quantity (EOQ) dalam Menganalisis Persediaan Bahan Baku Agregat Halus Produksi Buis Beton Di UD. KI Malisi, Sibro; Sundari, Susanti; Suwarni, Putri Endah
Industrika : Jurnal Ilmiah Teknik Industri Vol. 8 No. 1 (2024): Industrika: Jurnal Ilmiah Teknik Industri
Publisher : Fakultas Teknik Universitas Tulang Bawang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.37090/indstrk.v8i1.1382

Abstract

UD. KI is an industry that produces Buis Benton type precast concrete. The materials that make up concrete blocks are cement, water, and coarse and fine aggregates. The supply of coarse aggregate is obtained from Gunung Sugih river sand, where availability is greatly influenced by flood conditions during the rainy season where there is a slight shortage which causes an increase in order prices. If the company wants to take steps to secure stock of sand raw materials to anticipate increases in order costs and ensure production continuity, this will disrupt the balance of production capital costs and the availability of storage space. Therefore, it is necessary to measure raw material inventories so that companies can take safety measures to anticipate increases in order costs and ensure production continuity. Analysis of the supply of coarse aggregate raw materials in concrete buis production at UD. KI uses the Economic Order Quantity (EOQ) method. By implementing the EOQ method, ordering value can be saved by 214.04 tonnes in 2021 and 173.28 tonnes in 2022, and there has been a significant reduction in the order frequency level from 12 times to 2 times per year, with a safety stock of 61.74 tons. Keywords: Coarse aggregate, Buis concrete, EOQ, Safety stock
Co-Authors Heri Hermansyah Margaretha, Grace Perdani, Meka Saima Putri, Dwini Normayulisa Sundari, Susanti Suwarni, Putri Endah