Effect of Seasons and Sources of Raw Water on the Properties of Water Treatment Residue Compacted Clay

Abstract

Seasons affect the rainfall and river current. Thus, the quality of raw water from rivers as well as the property of water treatment residue (WTR) from water treatment plant are season-dependent. In this research, the season-dependent properties of WTR as compacted clay from five treatment plants located in the central of Thailand has been studied. These properties included Liquid Limit (LL), Plastic Limit (PL), Shrinkage Limit (SL), particles size, Optimum Moisture Content (OMC), and Unconfined Compressive Strength (UCS). It is found that the seasons and the sources of raw water in Thailand slightly affected the properties of WTR. The highest quality WTR was obtained from Tha Chin River, especially, those collected at the end of winter. A comparison between clay and WTR properties showed that their physical properties were similar. However, their strength and permeability were different. Clay-WTR mixture with the ratio of 1:1 is recommended for landfill liner because it offers comparable properties with clay but with a lower material cost.