BITS Faculty Publications

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Author: search.filters.author.Gupta, RajivSubject: search.filters.subject.Hazardous waste

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    Economical Treatment Method for Waste Pickling Liquor for Micro, Small and Medium Scale Enterprises
    (Tech Journal, 2014) Singhal, Anupam; Gupta, Rajiv; Verma, Sanjay Kumar
    Waste pickling liquor is pertinent to hazardous waste. Various types of recovery and regeneration methods are used to recover and regenerate the acid and metals from waste pickling liquor. But these methods are sumptuous and not amenable for small scale industries. In a developing country like India, where lots of micro, small and medium scale industries exist, only precipitation is a pecuniary treatment method but it generates lots of sludge. There are severe problems in its disposal to lined sites (landfills). This study has been undertaken to minimize the generation of the pickling sludge by different neutralizing agents and their combinations with economic valuation and also sludge characterization has been done. The results show that the treatment of pickling effluent with lime only is the economical solution but the quantity of sludge generation is on a higher side. However, the authors recommend 20% calcium hydroxide and 80% sodium hydroxide for the treatment because sludge reduction is appreciable and lower sludge generation will result in lower cost of sludge handling, i.e., sludge collection, transportation and disposal arrangement. The sludge characterization results show that the sludge generated by the treatment of WPL requires further treatment before using it as a building material.
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    A Study on Application of Pickling Sludge in Pavements Tiles
    (RTESE, 2019-06) Verma, Sanjay Kumar; Gupta, Rajiv; Singhal, Anupam; Devi, Anuradha
    Spent pickling liquor disposal is not safe according to US K062 the Environmental Protection Agency (EPA) and Hazardous Waste (Management &Handling) Rule, 1989. In the normal practice pickling sludge is being disposed off on both sides of roads and railway tracks to fill low-lying areas. This may cause a severe problem of ground water contamination. In the present study, an attempt has been made to examine the potential of utilizing Solidification and stabilization (S/S) pickling sludge in pavement tiles as a substitute to cement to avoid disposal problem. The results of this work showed that the compressive strength of pavement tiles increases by replacing cement with pickling sludge up to 10%. As per US EPA TCLP test, heavy metal (Fe, Cr, and Ni) concentrations are below detectable limit in the leachate of pavement tiles at 28 days of curing. Thus, sludge-cement pavement tiles can be safely used on the footpath. Reusing pickling sludge as the raw materials of the pavement will not only solve the disposal problem, but also decrease the producing cost of pavement.