High-rate activated sludge systems combined with dissolved air flotation enable effective organics removal and recovery

Autor: Korneel Rabaey, Wilbert Menkveld, Tom G.L. Vandekerckhove, Marjoleine Weemaes, Stijn O. Decru, Francis Meerburg, Bart Saerens, Cristina Cagnetta, Bart De Gusseme, Siegfried E. Vlaeminck, Arne Verliefde, Jo De Vrieze, Eddie Broeders
Jazyk: angličtina
Rok vydání: 2019
Předmět:
0106 biological sciences
Flocculation
Technology
Adsorption/bio-oxidation system
Sludge thickening
Environmental Engineering
Energy & Fuels
Dissolved air flotation
High-rate activated sludge (HRAS) system
Bioengineering
010501 environmental sciences
01 natural sciences
Waste Disposal
Fluid
Dissolved air flotation (DAF)
CARBON
BIOFLOCCULATION
Settling
Biogas
Methanation
010608 biotechnology
ANAEROBIC-DIGESTION
MANAGEMENT
RATE CONTACT-STABILIZATION
Biology
Waste Management and Disposal
0105 earth and related environmental sciences
MEMBRANE BIOREACTOR
Science & Technology
Sewage
Waste activated sludge (WAS)
A-STAGE
Renewable Energy
Sustainability and the Environment
Chemistry
Physics
Agriculture
General Medicine
PERFORMANCE
Pulp and paper industry
WASTE-WATER TREATMENT
Anaerobic digestion
Activated sludge
Biotechnology & Applied Microbiology
Yield (chemistry)
Biofuels
FLOCCULATION
Agricultural Engineering
Engineering sciences. Technology
Life Sciences & Biomedicine
Zdroj: Bioresource technology
ISSN: 0960-8524
Popis: High-rate activated sludge (HRAS) systems typically generate diluted sludge which requires further thickening prior to anaerobic digestion (AD), besides the need to add considerable coagulant and flocculant for the solids separation. As an alternative to conventional gravitational settling, a dissolved air flotation (DAF) unit was coupled to a HRAS system or a high-rate contact stabilization (HiCS) system. The HRAS-DAF system allowed up to 78% removal of the influent solids, and the HiCS-DAF 67%. Both were within the range of values typically obtained for HRAS-settler systems, albeit at a lower chemical requirement. The separated sludge had a high concentration of up to 47 g COD L-1, suppressing the need of further thickening before AD. Methanation tests showed a biogas yield of up to 68% on a COD basis. The use of a DAF separation system can thus enable direct organics removal at high sludge concentration and with low chemical needs. ispartof: BIORESOURCE TECHNOLOGY vol:291 ispartof: location:England status: published
Databáze: OpenAIRE
Externí odkaz: