Microfiber pollution from Dhobi Ghats (open air laundry centers) and commercial laundries in a north Indian city.

Abstract

In regions like Southeast Asia, Dhobi Ghats-traditional open-air laundromats-hold cultural significance and provide livelihoods to many people. These centers are near the riverbanks for easy access to water for washing. These Dhobi Ghats are among major sources of microfibers (MFs) in the waterbodies. However, there is no ample data that confirms their level of MF release into the waterbodies. This study reports for the first time the prevalence of microfibers (MFs) in wastewater from Dhobi Ghats in a North Indian city and comparatively assess them with the MF pollution from commercial laundries. A mean microfiber concentration of 3204 ± 270 MFs/L was observed in the discharged effluents of Dhobi Ghats, while a concentration at 36,923 ± 389 MFs/L was observed in effluents from commercial laundries. Pertinently, microfibers measuring less than 75µm dominated in effluents of commercial laundries, accounting for 53% of the total. Conversely, microfibers within the 75-150-µm range were present in effluents of Dhobi Ghats, constituting 52%. Spectroscopic analyses by FTIR showed polyester and polyamides as the main polymers released from Dhobi Ghats. Ecological risk assessment demonstrated a potential environmental risk from the MF pollution from Dhobi Ghats and commercial laundries. The study also proposed a mitigation framework prioritizing both environmental protection and the sustenance of local livelihoods for reducing the microfiber pollution by the Dhobi Ghats.