Case study on water quality index for wastewater treatment in Mumbai

Abstract

The traditional wastewater treatment process is laborious and demanding in terms of time, energy, and space. With rapid advancements, there's a quest for more efficient techniques that can achieve comparable treatment outcomes while minimizing these demands. This study proposes a solution by employing ozone as an Advanced Oxidation Process (AOP) to expedite the treatment while enhancing the water quality. The Water Quality Index (WQI) offers a consolidated representation of overall water quality by considering multiple quality parameters. Although typically used for assessing surface water quality, this study utilizes WQI to gauge the enhancement in parameters post-treatment. The research investigates the impact of varied ozone doses on raw sewage samples collected from four different sites in Mumbai, focusing on parameters such as dissolved oxygen, turbidity, hardness, chemical oxygen demand (COD), and WQI. The results demonstrate a notable percentage enhancement in WQI, ranging from 30 to 60% across various sites within a short 25-minute timeframe, attributed to the application of ozone. HIGHLIGHTS Conventional wastewater treatment methods are time-consuming and resource-intensive.; AOP is proposed as a solution to expedite treatment and improve water quality.; Normally used for surface water assessment, WQI is employed here to measure improvements post-treatment.; Study examines varied ozone doses on sewage samples from Mumbai, analyzing parameters like DO, turbidity, hardness, COD, and WQI.; Significant enhancements in WQI (30–60%) within 25 minutes demonstrate ozone's promise in reducing treatment time and space requirements, with simplified installation and maintenance compared to traditional methods.;

Keywords

• aop
• domestic wastewater
• municipal wastewater
• ozonation
• wqi