2.3 Sampling and Analysis
Analyses undertaken in triplicates. The pH measured by pH meter (Cyberscan 20), while oil and grease measured according standard method 1164, EPA. Suspended solid, color and COD measured by DR 5000 HACH spectrophotometer that is adapted from Standard Method for Water and wastewater. All water color measures described in this work report as true color values using the platinum-cobalt (Pt-Co) method, the unit of color being that produced by 1 mg platinum/L in the form of the chloroplatinate ion (APHA, AWWA & WEF, 2012). The samples were filtered using 0.45 μm filter paper before colors were measured.