Rancangan Alat Bantu untuk Mengurangi Beban Kerja pada Unit Filtrasi Pengolahan Air

Abstract

The PERUMDA Tirtanadi water treatment facility, Limau Manis branch, is a water treatment installation that has been built since 2003. It consists of several stages of water treatment, one of which is the filtration unit. The filter tanks are cleaned, and the filter media is replaced with new ones every 7 to 8 months. The process of replacing the filter media (sand and gravel) involves dismantling, transporting, and replacing the sand and gravel in the filter tanks. The filter tanks have dimensions of 4.8 meters in length, 4.8 meters in width, and 5 meters in height. The process of replacing the filter media is done manually and repeatedly. The filter media that is removed and transported consists of 23 tons of sand and 10 tons of gravel. The manual process of replacing the filter media takes 2 to 3 months to complete. This study aims to design an assisting tool that can reduce workload and improve the working method. The research process involves all workers in the filtration tanks. The researcher distributed Nordic Body Map questionnaires to the workers to determine the level of operator complaints. The assessment of workers' working posture was conducted using the REBA method. The pulse rate or %CVL was calculated before and after work using an Oximeter. The results showed the existence of discomfort complaints and poor working postures, indicating the need for improvement. Based on the analysis of the data, an assisting tool was designed to reduce workload and improve the working method. Workers can work practically and efficiently using the assisting tool without having to manually carry heavy loads.