Towards zero waste production in the paint industry wastewater using an agro-based material in the treatment train

• Published in: Environmental monitoring and assessment 2018-10, Vol.190 (10), p.587-9, Article 587
• Main Authors: Vishali, S., Roshini, S. K., Samyuktha, M. R., Ashish anand, K.
• Format: Article
• Language: English
• Subjects: Agricultural wastes; Atmospheric Protection/Air Quality Control/Air Pollution; Coagulants; Coagulation; Color; Color removal; Colour; Earth and Environmental Science; Ecology; Ecotoxicology; Effluent treatment; Effluents; Environment; Environmental Management; Environmental Monitoring; Environmental science; Filtration; Flocculation; Industrial Waste - analysis; Membrane filtration; Membrane separation; Monitoring/Environmental Analysis; Moringa oleifera; Moringa oleifera - chemistry; Organic chemistry; Paint; Paint industry; Paints; pH effects; Powder; Properties; Removal; Sand; Sedimentation; Seeds - chemistry; Sodium chloride; Turbidity; Waste Disposal, Fluid - methods; Waste Products - analysis; Waste Products - statistics & numerical data; Waste Water - analysis; Waste Water - statistics & numerical data; Wastewater; Wastewater treatment; Water Purification - methods
• ISSN: 0167-6369; 1573-2959
• DOI: 10.1007/s10661-018-6904-z

An attempt has been made to evaluate the use of natural, agro-based material, Moringa oleifera as a coagulant in the treatment of recreated water-based paint effluent. The treatment train sequence comprising coagulation, flocculation, sedimentation, sand filtration, and membrane filtration was used. The efficiency was evaluated in terms of color and turbidity. The influence of experimental parameters such as eluent type, eluent concentration, coagulant dose, coagulant-eluate volume, initial effluent pH, and initial effluent concentration was examined. The recommended conditions to yield maximum removal efficiency are 80 mL of eluate prepared using 3 g of M . oleifera seed powder and 1 N NaCl, under actual pH, to treat a liter of effluent. The treated supernatant from coagulation unit was passed through a sand filtration setup and a membrane filtration, with a maximum removal of color above 95%. The results affirmed the positive coagulation properties of M . oleifera , which could serve as a better alternative for chemical coagulant. The optimized treatment conditions derived for the recreated paint effluent were applied in the real paint effluent treatment. An opportunity was identified for re-using treated wastewater, as a cooling fluid and a diluting agent for lower quality paints. The results affirmed the positive coagulation properties of M . oleifera , which could serve as a better alternative for chemical coagulant. Graphical abstract ᅟ