Methane recovery from water hyacinth through anaerobic activated sludge process
The concepts of phase separation, anaerobic activated sludge process, and alkali pretreatment have been incorporated in this investigation with the objective of developing rational and cost-effective designs of diphasic anaerobic activated sludge systems, with and without alkali treatment, for methane recovery from water hyacinth (WH). Evaluation of process kinetics and optimization analyses of laboratory data reveal that a diphasic system with alkali treatment could be designed with an alkali pretreatment step (3.6% Na/sub 2/CO/sub 3/ + 2.5% Ca(OH)/sub 2/ (w/w) of WH, 24 h duration) followed by an open acid phase (2.1 days HRT) and closed methane reactor with sludge recycle (5.7 days HRT, 7.7 days MCRT) for gas yield of 50 l/kg WH/d at 35-37/sup 0/C. Likewise, a diphasic system without alkali treatment could be designed with an open acid phase (2 days HRT) followed by close methane reactor with sludge recycle (3.2 days HRT, 6 days MCRT) for gas yield of 32.5 l.kg WH/d at 35-37/sup 0/C. Detailed economic analyses bring forth greater cost-efficacy of the diphasic system without alkali treatment and reveal that the advantage accrued in terms of higher gas yield is overshadowed by the cost of chemicals in the diphasic system with alkali treatment.
- Research Organization:
- Indian Institute Technology, Bombay
- OSTI ID:
- 5366748
- Journal Information:
- Biotechnol. Bioeng.; (United States), Vol. 28:2
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
BIOMASS CONVERSION PLANTS
DESIGN
ECONOMICS
METHANE
PRODUCTION
WATER HYACINTHS
ALKALINE HYDROLYSIS
ANAEROBIC DIGESTION
ACTIVATED SLUDGE PROCESS
ANAEROBIC CONDITIONS
BIOCHEMICAL REACTION KINETICS
COST
HYDROXIDES
LABORATORIES
OPTIMIZATION
ALKANES
AQUATIC ORGANISMS
BIOCONVERSION
CHEMICAL REACTIONS
DECOMPOSITION
DIGESTION
HYDROCARBONS
HYDROGEN COMPOUNDS
HYDROLYSIS
KINETICS
LYSIS
MANAGEMENT
ORGANIC COMPOUNDS
OXYGEN COMPOUNDS
PLANTS
PROCESSING
REACTION KINETICS
SOLVOLYSIS
WASTE MANAGEMENT
WASTE PROCESSING
090122* - Hydrocarbon Fuels- Preparation from Wastes or Biomass- (1976-1989)
140504 - Solar Energy Conversion- Biomass Production & Conversion- (-1989)