Design, development and performance evaluation of skid-mounted pilot wastewater treatment and resource recovery unit for mechanical scavenging vehicle. (15th October 2022)

• Record Type: Journal Article
• Authors: Mukherjee, Anupam; Chalicheemala, Srinath; Roy, Subhankar; Mullick, Aditi; De, Sirshendu; Roy, Anirban; Moulik, Siddhartha
• Is Part Of: Journal of cleaner production. Volume 371(2022)
• Publication Date: 2022-10-15
• Subjects: Mechanical scavenging -- Municipal wastewater -- Resource recovery -- Hydrodynamic cavitation -- Computational fluid dynamics; Factory and trade waste -- Management -- Periodicals; Manufactures -- Environmental aspects -- Periodicals; Déchets industriels -- Gestion -- Périodiques; Usines -- Aspect de l'environnement -- Périodiques; 628.5
• DOI: 10.1016/j.jclepro.2022.133564
• Languages: English
• ISSNs: 0959-6526

Abstract

Abstract: The current work is an effort towards developing a sustainable solution towards the obnoxious practice of manual scavenging of the drainage pipelines and clogged pits in the developing countries. Here, a skid-mounted system has been developed and tested that works both as wastewater treatment and recovery unit and also for recovery of valuable nutrients that further has economic value. The initial bench scale work was carried out in two different approaches: the first targeting to a sequential process of separating the N, P in the form of struvite as a nutrient rich bio-cake followed by treatment & recovery of the supernatant liquid through AOP. The second approach intended to initially reduce the solid content of the effluent through coagulation followed by separating the nutrient laden liquid and treatment by AOPs to degrade the organic. Under the optimized condition of pH 9.5, Mg:P:NH4 at 1.1:1:1 and 20 min, maximum recovery of the nutrient was achieved. The results obtained from ozone based AOP was improved by combining a venturi-based cavitation device under optimized geometric and operating condition. Both the nutrient rich bio-cake obtained from degraded sludge in a rotating hydrodynamic cavitator as well the nutrient rich water was used as the fertilizer for studying the plant growth rate and compared with commercial fertilizer. The techno-economic study indicates that $ 0.22/m 3 as operational cost for treatment and recycling of sewage wastewater using the developed skid mounted device reveals techno-economic viability and self-sustainability of the process. Graphical abstract: Image 1 Highlights: Development of a skid mounted unit for cleaning of municipal drainage system. Application of chemical precipitation followed by advanced oxidation process. Multiphase CFD based design and optimization of hydrodynamic cavitation unit. Valuable nutrient recovery and use as fertilizer for plant growth study. Pilot scale system development and study with real-life municipal wastewater.