Pyrolysis of activated sludge: Energy analysis and its technical feasibility. (February 2015)

• Record Type: Journal Article
• Authors: Agarwal, Manu; Tardio, James; Venkata Mohan, S.
• Is Part Of: Bioresource technology. Volume 178(2015)
• Page Start: 70
• Page End: 75
• Publication Date: 2015-02
• Subjects: Electrical power -- Hydrogen -- Methane -- Char -- Biorefinery; Biomass -- Periodicals; Biomass energy -- Periodicals; Bioremediation -- Periodicals; Agricultural wastes -- Periodicals; Factory and trade waste -- Periodicals; Organic wastes -- Periodicals; Bioénergie -- Périodiques; Déchets agricoles -- Périodiques; Déchets industriels -- Périodiques; Déchets organiques -- Périodiques; Déchets (Combustible) -- Périodiques; 662.88
• DOI: 10.1016/j.biortech.2014.09.134
• Languages: English
• ISSNs: 0960-8524

Abstract

Highlights: Activated sludge is a potent source of renewable energy. Pyrolysis of activated sludge can produce 478.3 kWh/T electrical energy. Pyrolysis of activated sludge can produce 31.238 m 3 /T bio-gas. A full scale commercial process is a potent alternative energy technology. Abstract: A comprehensive study on the potential of pyrolysis of activated sludge to generate substances that can be used to produce energy was evaluated for its technical and environmental viability. The products of the process viz., pyrolysis gas, pyrolysis oil and char can readily be used by the major energy consumers viz., electricity and transportation. Based on the results obtained it is estimated that a 1 ton capacity process for pyrolysis of activated sludge can serve the electrical needs of a maximum of 239, 95 and 47 Indian houses per day, considering lower middle class, middle class and upper middle class, respectively. In addition the process would also produce the daily methane (CNG) requirement of 128 public transport buses. The process was determined to be technically feasible at low and medium temperatures for both, pyrolysis gas and electrical energy. The gas generated could be utilized as fuel directly while the oil generated would require pretreatment before its potential application. The process is potentially sustainable when commercialized and can self-sustain in continuous mode of operation in biorefinery context.