INVESTIGATION OF TEXTILE DYES AS A GROUNDWATER CONTAMINANT IN MANDALAY MYANMAR

Textile dyeing and weaving of traditional longyi garments has occurred in the Amarapura Township of Mandalay, Myanmar since 1822, transitioning from natural to chemical dyes in the early 1900’s. With no current wastewater treatment facilities in Mandalay, dye effluents mix with other wastewaters in unlined canals dug near peoples’ homes and discharge into local rivers and lakes. As locals rely heavily on dug and tube wells next to these wastewater canals for their drinking, bathing, and cooking, this industry poses a major health hazard to people in this region. The objective of this study is to identify and quantify the concentrations of major ions and heavy metals found in textile dye effluents and to determine the impact on local groundwater resources. Water samples from each stage of the dye process have helped to identify the previously unknown composition of the dye powders, while samples collected from tube and dug wells, both at dyeing sites and upgradient of these operations, have been used to assess the geochemistry of contaminated and background water sources. Preliminary results identified heavy metals in varying concentrations throughout each step of the dyeing process. The highest levels of heavy metals were found at the openings of discharge pipes, where multiple dyes mix together before spreading to the surrounding environment. Heavily reducing environments were also identified in the main dye mixtures and nearby tube wells, resulting from the high basicity of the dye mixtures. High electrical conductivity was also recorded in both dye bath mixtures and local tube wells, due to the addition of sodium hydroxide in one of the initial steps of the dyeing process to strengthen color fastness. These results are not seen in samples taken from upgradient of the select dyeing operations. Textile dyeing is a major source of pollution and a health hazard to the people within the Amarapura Township, however locals are not readily connecting the dye practices to the issues with their drinking water.