Influence of predominant wind angle direction to CO concentration in the surrounding area of cement industry

Abstract

This study aims to determine the effect of predominant wind angle on the concentration of CO received by receptors (receptor position) due to the cement industry. This research was conducted in the surrounding area of the cement industry in Padang City. The sampling of CO concentration was undertaken at 3 sampling points, that is Unand Blok D Residence, Padang Besi Residence, and Batu Gadang Residence, that is representing of the receptor positions (α), i.e. 0°, 45° and 90°. In addition, sampling was also conducted at background point in Bukit Sungkai, Batu Busuk, Padang City. Sampling CO concentration at 4 sampling points using an impinger. The sampling of each location was done every hour for 24 hours of measurement (24 data per sampling point), with a total of 96 data. The results showed CO concentrations range between 124,502 and 287,292 μg/Nm3. The highest concentration was found at α 0° (Unand Blok D Residence) while the lowest concentration was located at α 90° (Batu Gadang Residence). Meanwhile, CO concentrations in the background point (Bukit Sungkai, Batu Busuk) is relatively lower than the three-sampling point above, ranging from 44.22 μg/Nm3 up to 74.13 μg/Nm3. The decrease in CO concentration on wind coming angle occurred from 0° to 45° by 13.79% and α 0° to 90° by 25.38%. This decrease happened by shifting α from 0° to 90°. This indicated that there is an effect of predominant wind angle direction towards CO concentration received by the receptor.