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3 results on '"Conventional activated sludge system (CAS)"'

1. Treatment of textilewaste water by CAS, MBR, and MBBR: A comparative study from technical, economic, and environmental perspectives

Author

Universitat Politècnica de Catalunya. Departament d'Enginyeria de Projectes i de la Construcció, Universitat Politècnica de Catalunya. Institut d'Investigació Tèxtil i Cooperació Industrial de Terrassa, Universitat Politècnica de Catalunya. ENMA - Enginyeria del Medi Ambient, Yang, Xuefei, López Grimau, Víctor, Vilaseca Vallvé, M. Mercedes, Crespi Rosell, Martin, Universitat Politècnica de Catalunya. Departament d'Enginyeria de Projectes i de la Construcció, Universitat Politècnica de Catalunya. Institut d'Investigació Tèxtil i Cooperació Industrial de Terrassa, Universitat Politècnica de Catalunya. ENMA - Enginyeria del Medi Ambient, Yang, Xuefei, López Grimau, Víctor, Vilaseca Vallvé, M. Mercedes, and Crespi Rosell, Martin

Abstract

In this study, three different biological methods—a conventional activated sludge (CAS)system, membrane bioreactor (MBR), and moving bed biofilm reactor (MBBR)—were investigatedto treat textile wastewater from a local industry. The results showed that technically, MBR was themost efficient technology, of which the chemical oxygen demand (COD), total suspended solids (TSS),and color removal efficiency were 91%, 99.4%, and 80%, respectively, with a hydraulic retention time(HRT) of 1.3 days. MBBR, on the other hand, had a similar COD removal performance comparedwith CAS (82% vs. 83%) with halved HRT (1 day vs. 2 days) and 73% of TSS removed, while CAShad 66%. Economically, MBBR was a more attractive option for an industrial-scale plant since itsaved 68.4% of the capital expenditures (CAPEX) and had the same operational expenditures (OPEX)as MBR. The MBBR system also had lower environmental impacts compared with CAS and MBRprocesses in the life cycle assessment (LCA) study, since it reduced the consumption of electricityand decolorizing agent with respect to CAS. According to the results of economic and LCA analyses,the water treated by the MBBR system was reused to make new dyeings because water reuse in thetextile industry, which is a large water consumer, could achieve environmental and economic benefits.The quality of new dyed fabrics was within the acceptable limits of the textile industry., This research was co-funded by ACCIÓ (Generalitat de Catalunya) within the REGIREU Project (COMRDI16-1-0062)., Peer Reviewed, Postprint (published version)

Published
2020

2. Treatment of textilewaste water by CAS, MBR, and MBBR: A comparative study from technical, economic, and environmental perspectives

Author

Xuefei Yang, Mercedes Vilaseca, Víctor López-Grimau, Martí Crespi, Universitat Politècnica de Catalunya. Departament d'Enginyeria de Projectes i de la Construcció, Universitat Politècnica de Catalunya. Institut d'Investigació Tèxtil i Cooperació Industrial de Terrassa, and Universitat Politècnica de Catalunya. ENMA - Enginyeria del Medi Ambient

Subjects
textile wastewater, Textile industry, Indústria tèxtil -- Residus, lcsh:Hydraulic engineering, Hydraulic retention time, Moving bed biofilm reactor (MBBR), Geography, Planning and Development, Aigües residuals -- Depuració, Desenvolupament humà i sostenible::Enginyeria ambiental::Tractament de l'aigua [Àrees temàtiques de la UPC], 02 engineering and technology, water reuse, 010501 environmental sciences, Aquatic Science, Membrane bioreactor, 01 natural sciences, Biochemistry, Textile industry--Environmental aspects, Water reuse, lcsh:Water supply for domestic and industrial purposes, economic feasibility, lcsh:TC1-978, membrane bioreactor (MBR), Aigua -- Reutilització -- Aplicacions industrials, 0105 earth and related environmental sciences, Water Science and Technology, Total suspended solids, lcsh:TD201-500, conventional activated sludge system (CAS), Moving bed biofilm reactor, business.industry, Textile wastewater, Chemical oxygen demand, Conventional activated sludge system (CAS), 021001 nanoscience & nanotechnology, Pulp and paper industry, Economic feasibility, Activated sludge, Wastewater, Sewage -- Purification, Membrane bioreactor (MBR), life cycle assessment (LCA), Enginyeria tèxtil::Impacte ambiental [Àrees temàtiques de la UPC], Environmental science, Life cycle assessment (LCA), moving bed biofilm reactor (MBBR), 0210 nano-technology, business
Abstract

In this study, three different biological methods&mdash, a conventional activated sludge (CAS) system, membrane bioreactor (MBR), and moving bed biofilm reactor (MBBR)&mdash, were investigated to treat textile wastewater from a local industry. The results showed that technically, MBR was the most efficient technology, of which the chemical oxygen demand (COD), total suspended solids (TSS), and color removal efficiency were 91%, 99.4%, and 80%, respectively, with a hydraulic retention time (HRT) of 1.3 days. MBBR, on the other hand, had a similar COD removal performance compared with CAS (82% vs. 83%) with halved HRT (1 day vs. 2 days) and 73% of TSS removed, while CAS had 66%. Economically, MBBR was a more attractive option for an industrial-scale plant since it saved 68.4% of the capital expenditures (CAPEX) and had the same operational expenditures (OPEX) as MBR. The MBBR system also had lower environmental impacts compared with CAS and MBR processes in the life cycle assessment (LCA) study, since it reduced the consumption of electricity and decolorizing agent with respect to CAS. According to the results of economic and LCA analyses, the water treated by the MBBR system was reused to make new dyeings because water reuse in the textile industry, which is a large water consumer, could achieve environmental and economic benefits. The quality of new dyed fabrics was within the acceptable limits of the textile industry.

Published
2020

3. Treatment of Textile Wastewater by CAS, MBR, and MBBR: A Comparative Study from Technical, Economic, and Environmental Perspectives.

Author

Yang, Xuefei, López-Grimau, Víctor, Vilaseca, Mercedes, and Crespi, Martí

Subjects
MOVING bed reactors, TOTAL suspended solids, WATER reuse, COLOR removal (Sewage purification), CHEMICAL oxygen demand, WASTEWATER treatment
Abstract

In this study, three different biological methods—a conventional activated sludge (CAS) system, membrane bioreactor (MBR), and moving bed biofilm reactor (MBBR)—were investigated to treat textile wastewater from a local industry. The results showed that technically, MBR was the most efficient technology, of which the chemical oxygen demand (COD), total suspended solids (TSS), and color removal efficiency were 91%, 99.4%, and 80%, respectively, with a hydraulic retention time (HRT) of 1.3 days. MBBR, on the other hand, had a similar COD removal performance compared with CAS (82% vs. 83%) with halved HRT (1 day vs. 2 days) and 73% of TSS removed, while CAS had 66%. Economically, MBBR was a more attractive option for an industrial-scale plant since it saved 68.4% of the capital expenditures (CAPEX) and had the same operational expenditures (OPEX) as MBR. The MBBR system also had lower environmental impacts compared with CAS and MBR processes in the life cycle assessment (LCA) study, since it reduced the consumption of electricity and decolorizing agent with respect to CAS. According to the results of economic and LCA analyses, the water treated by the MBBR system was reused to make new dyeings because water reuse in the textile industry, which is a large water consumer, could achieve environmental and economic benefits. The quality of new dyed fabrics was within the acceptable limits of the textile industry. [ABSTRACT FROM AUTHOR]

Published
2020
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