Enhancing physico-chemical water quality in recycled dairy effluent through microbial consortium treatment

• Published in: Heliyon 2024-11, Vol.10 (21), p.e39501, Article e39501
• Main Authors: Velmurugan, Lavanya, Pandian, Kannan Dorai
• Format: Article
• Language: English
• Subjects: Dynamic sludge activation process; Elevated water quality standards; Green bioremediation solutions; Optimal contaminant elimination; Progressive biodegradability assessment
• ISSN: 2405-8440; 2405-8440
• DOI: 10.1016/j.heliyon.2024.e39501

The dairy industry, notorious by generating wastewater rich in organic and nitrogenous content, necessitates sustainable recycling solutions. Biological treatment emerges as a cost-effective and chemical-free alternative. This study delves into the potential of microbial consortium, a microbial consortium, for recycling dairy effluent, aiming at water reclamation and environmental sustainability. Effluent samples from Madurai's Dairy Industry underwent microbial consortium treatment in a recycling prototype, with treatment efficacy assessed through physicochemical parameters and contaminant removal efficiency. Guided by a biodegradability index of 4.51, the study showcased EM's impact, revealing a notable decrease in pH levels, fostering an alkaline environment (2.35 ± 0.06 ppt). Dissolved oxygen increased significantly to 4.50 ppm, indicating improved aerobic conditions. EM treatment led to substantial reductions in calcium (53 %), magnesium (95 %), nitrogen (22 %), sulfate (79 %), phosphate (86 %), BOD (78 %), and COD (82 %). In contrast, dairy effluent treated without microbial consortium during the sludge activation process exhibited negligible water quality improvement. These findings underscore microbial consortium efficacy in advancing biological treatment of dairy effluent, demonstrating a significant reduction in contaminants and showcasing its potential for sustainable water reclamation. Improved alkalinity, dissolved oxygen, and nutrient content further signify positive impacts on ecosystem health. Microbial consortium emerges as a promising avenue for recycling dairy effluent, offering an economically viable and environmentally friendly solution. The study emphasizes the crucial role of microbial treatments in achieving efficient water reclamation, contributing to a cleaner and sustainable environment. Future research and broader implementation of microbial consortium in dairy industry wastewater management are recommended for enhanced environmental benefits. [Display omitted] •Bioremediation selected for dairy effluent with high biodegradability.•EM Consortium removes ions in raw dairy wastewater effectively.•Favourable oxidation and mineralization of inorganic compounds observed.•EM application efficiently purifies and recycles dairy effluent contaminants.