Abstract
The beam house operations in tanning process of hides/skins comprise of soaking, liming, fleshing and deliming operations. The removal of animal hair and flesh from skin is facilitated by the liming operation. About 5 m3/ton of wastewater containing a credible concentration of sulphide and dissolved proteins are discharged in tannery process. It is highly alkaline and having high BOD/COD ratio. The biological treatment of wastewater occurs at neutral pH requires neutralization of the wastewater using acidic stream. This results in the emission of hydrogen sulphide which is considered to be highly toxic gas. The present investigation employed Heterogeneous Peroxide Oxidation process (HPO) for the oxidation of sulphide in the lime sulphide liquor without sludge production with simultaneous removal of COD from wastewater. The screened effluent was adjusted to pH 9.7 using conc. sulphuric acid, and it is catalytically oxidized with hydrogen peroxide 3.921 mM/L and nanoporous activated carbon (NPAC), 30 g/L at HRT 24 h. The dosage of hydrogen peroxide, mass of NPAC and HRT were optimized. The integrated catalytic and biological oxidation in Fluidized Immobilized Carbon Catalytic Oxidation (FICCO) reactor eliminated COD, sulphide, total Kjeldahl nitrogen, protein, amino acids and TOC by 66.66, 98.95, 75.67, 44.21, 48.98 and 62.18%, respectively. The sulphide present in the wastewater was catalytically oxidized to sulphate, and ammonia content was increased about 78.05% by cleaving protein molecules.
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Acknowledgements
The authors are very thankful for providing the facilities through the project INDO-VIETNAM JOINT RESEARCH PROJECT GAP1065, CSIR-CLRI to carry out the research work and we would like to thank Centralised Sophisticated Instruments Facility centre of CSIR-CLRI for helping us to analyse TGA.
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Prabhakaran, N., Swarnalatha, S., Sekaran, G. (2018). Catalytic Oxidation of Sulphide Laden Tannery Wastewater Without Sludge Production. In: Singh, V., Yadav, S., Yadava, R. (eds) Water Quality Management. Water Science and Technology Library, vol 79. Springer, Singapore. https://doi.org/10.1007/978-981-10-5795-3_10
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