EPI International Journal of Engineering

Pb Pb Adsorption of Coffee peel derived Activated Carbon by varying KOH Concentration

2024-03-20T05:52:23+00:00

Turning biomass waste into added value product is crucial as it is not only beneficial to the environment but also to the economy. Coffee peel is a waste that has excellent potential to produce activated carbon. Activated carbon is carbon that has gone through an activation process and has a large surface area and higher adsorption rate. The high need for activated carbon in overcoming waste problems makes it useful to reduce its environmental impact. Activated carbon is widely used in water filtration including heavy metal Pb and Cd. The aim of this research is to study the impact of KOH concentration on Pb adsorption of activated carbon derived from coffee peel. KOH activator could enhance the performance of the activated carbon. The KOH activator concentration is varied to obtain the best-surface structure in activated carbon. The KOH concentration is 2,3 and 4 molars. Each specimen will undergo the same carbon activation process by maintaining the carbonization and drying temperature. Then at the activation stage, variations of KOH concentration will be mixed with the activated carbon and soaked for 24 hours with a weight ratio of KOH to charcoal of 1,5 to 1. The result shown that fixed carbon of 2,3,4 molar KOH concentration are 45.99%, 58.22%, 42.99% respectively, while Pb adsorption are 96.56%, 98.34% and 96.45%. In addition, the adsorption rate of activated carbon is proportional to the concentration level of the KOH solution. However, there is a limit on adsorption concentration, so there is a significant decrease when KOH exceeds the saturation point. Based on this research, Pb adsorption of coffee peel derived activated carbon is quite significant even though the amount of fixed carbon relatively low

Application of ABC and EOQ Methods to Improve Control of Patented Medicine Inventory at Pharmacy A

2024-05-06T05:48:45+00:00

Abstract

This research aims to analyze drug inventory control at Pharmacy A using the Always Better Control (ABC) and Economic Order Quantity (EOQ) methods. Data on drug supplies, drug unit prices, and drug use from January to December 2021 were collected and analyzed using Microsoft Excel. Drugs are classified into three groups based on investment value. The results showed that group A had the highest investment value (80%) with 41 types of drugs, group B had a medium investment value (15%) with 24 types of drugs, and group C had the lowest investment value (5%) with 19 types of drugs. The EOQ value for group A varies from 1 item to 3170 items. This research recommends that Pharmacy A use the ABC and EOQ methods in managing drug supplies to make it more efficient, effective, and economical.

Keywords:- Pharmacy, Inventory Control, ABC, EOQ

Mine Scheduling of Lateritic Nickel Ore in The Mawar Block of PT Ang and Fang Brother Site Lalampu, Central Sulawesi Province, Indonesia

2024-07-01T13:57:55+00:00

PT Ang and Fang Brothers planned to open a new pit of lateritic nickel ore in Mawar Block. Mine scheduling of open-pit mines is an important thing in surface mine planning so the purpose of this research is to provide an overview of pit design and mining sequences, amount of production and number of equipment allocated in each sequence. The production targeted by the company was 50,000 tons by considering the mine recovery factor of 90%. Mine scheduling requires several data, namely cycle time, loss time, block model, equipment specifications and availability, slope and mine haul road geometry, and topography. The data used to design pit limits, mining sequences, and production scheduling. Based on the design of the mine pit, the total overburden that must be removed is 365,589 bcm and the total laterite nickel ore that must be stripped is 169,240 tons with a stripping ratio of 2.2:1 which is divided into three mining sequences. Total tonnage of lateritic nickel ore in the first to the third sequence is 55,677 tons, 55,518 tons, and 58,045 tons with overburden of 143,764 bcm, 136,055 bcm, and 85,770 bcm respectively. The equipment fleet of the first to the third sequence is 4 units’ loader with 17 units’ hauler, 4 units’ loader with 17 units’ hauler, and 3 units’ loader with 13 units’ hauler respectively.