Please use this identifier to cite or link to this item: http://scholarbank.nus.edu.sg/handle/10635/38779
Title: BIOLEACHING OF SPENT HYDROTREATING CATALYST BY THERMOPHILIC ARCHAEA ACIDIANUS BRIERLEYI
Authors: ABHILASHA BHARADWAJ
Keywords: Bioleaching, Spent catalyst, Thermophile, Acidianus brierleyi, Decoking
Issue Date: 17-Aug-2012
Source: ABHILASHA BHARADWAJ (2012-08-17). BIOLEACHING OF SPENT HYDROTREATING CATALYST BY THERMOPHILIC ARCHAEA ACIDIANUS BRIERLEYI. ScholarBank@NUS Repository.
Abstract: Rapid industrialization has led to the production of huge amounts of hazardous spent hydroprocessing catalysts from petro-chemical industries. Bioleaching is a cost effective, safe and environmentally benign process for the safe disposal of industrial waste and to avoid leaching of toxic metals into the environment. The bioleaching potential of thermophilic archaea Acidianus brierleyi and mesophilic bacteria Acidithiobacillus thiooxidans was investigated. Two types of spent hydrotreating catalyst were decoked to determine the effect of pretreatment on metal leaching. Coked and decoked spent catalyst was physically and chemically characterized and subjected to one step, two step and spent medium leaching by both microbes. Thermophile leaching at high temperature was found to be considerably more effective than the mesophillic culture. Bioleached spent catalyst was able to meet the regulations laid by USEPA and NEA for safe waste disposal and the thermophile was also able to leach more than 90% of the major heavy metals.
URI: http://scholarbank.nus.edu.sg/handle/10635/38779
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