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Nano‐layered TiO 2 for effective bacterial disintegration of waste activated sludge and biogas production
Author(s) -
Godvin Sharmila Vincent,
Rajesh Banu Jeyakumar,
Gunasekaran Muniappan,
Angappane Subramanian,
Yeom Ick Tae
Publication year - 2018
Publication title -
journal of chemical technology and biotechnology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.64
H-Index - 117
eISSN - 1097-4660
pISSN - 0268-2575
DOI - 10.1002/jctb.5626
Subject(s) - anaerobic digestion , methane , biogas , extracellular polymeric substance , activated sludge , chemistry , pulp and paper industry , sewage treatment , slurry , chemical oxygen demand , waste management , chemical engineering , materials science , organic chemistry , bacteria , biofilm , biology , engineering , composite material , genetics
BACKGROUND Proper management of the huge amount of waste activated sludge generated during the conventional treatment of wastewater is nowadays a major environmental issue. Proper treatment of sludge needs huge investment and proper handling. To address this issue, the immobilized photocatalyst (TiO 2 ) mediated exocellular fractionation of bacterial pretreatment for anaerobic digestion was utilized as a sludge treatment technique. RESULT Ti was deposited on glass substrate by a DC spluttering technique, and a TiO 2 layer was formed by annealing in oxygen atmosphere. This immobilized TiO 2 efficiently extricated the extracellular components after 45 min by removing 99% of the total extractable extracellular polymeric substances. The exocellular fractionated bacterial pretreatment induced 20% of COD solubilization with methane generation of about 0.0217 g COD g ‐1 COD d ‐1 , which was higher than the sludge without any treatment and sludge with bacterial pretreatment only. CONCLUSION An 8% increase in COD solubilization was achieved, which generated high quantities of methane. With the advantage of methane generation, the maximum profitable sludge reduction was obtained. Thin film deposition of TiO 2 enables easy recovery of TiO 2 . The cost, energy, and solid balance analysis confirmed that this treatment method is field applicable. © 2018 Society of Chemical Industry