Aplikasi Metode Pengapungan Batang dalam Menentukan Lama Waktu Pengendapan Air Limbah serta Estimasi Ukuran Partikel Total Suspended Solid (TSS) pada Air Limbah yang Viskositasnya Berbeda

Abstract

The Buoyancy Weighing Bar Method (BWM) is a new method for estimating the settling time and particle size estimation in wastewater and is very useful in the wastewater treatment industry. This study aims to examine the application of the rod flotation method in determining the estimated length of time for deposition of liquid waste at the wastewater treatment plant (WWTP) and the particle size distribution of Total Suspended Solid (TSS) in industrial wastewater consisting of two samples liquid, namely industrial waste water CV. Sinar Agri Kencana and Namorube Julu waste water with different viscosities use BWM. In this method, the change in the mass of the rods suspended in a liquid suspension of wastewater will be measured over time. The variations carried out were the diameters of the rods of 5 mm, 10 mm and 15 mm with variations in the shape of cylindrical rods, rectangular prisms, hexagon prisms, and sheets. As a parameter for determining the best time for settling wastewater, it is known from the results of the TSS purity measurement. The results of determining the particle size distribution are compared with the laser diffraction method and setting balance. Based on the results obtained, the type of stem that gives the best estimated settling time in wastewater CV. Sinar Agri Kencana and Namorube Julu waste water are cylindrical rods with a diameter of 5 mm and a length of 210 mm. The best settling time of CV. Sinar Agri Kencana and Namorube Julu waste water respectively at 150 and 310 minutes with the results of purity from TSS of 205 mg/L and 168 mg/L. In the variation of stem shape, the deposition time is close to each shape. The results obtained by BWM can be used to estimate the best settling time for wastewater. The rod flotation method can be used to determine the particle size distribution of TSS and the results are comparable to the settling balance method and the laser diffraction method. The results of the measurement of the particle size distribution obtained with each method are 694 – 1581 μm, 647 – 1579 μm and 613 – 1584 μm in CV. Sinar Agri Kencana waste water and 519 – 1421 μm, 553 – 1444 μm and 564 – 1464 μm in the waste water of Namorube Julu.