Department of Chemistry

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Author: search.filters.author.Singhal, AnupamSubject: search.filters.subject.Chemistry

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    A Study on Utilization of Treated Spent Liquor Sludge with Fly Ash by Making Cement Concrete Hollow Cavity Bricks
    (IJEP, 2012-09) Singhal, Anupam
    This solid waste may contaminate surface run-off and surface water. In stainless steel pickling industries, a lot of sludge is generated and disposal of above sludge as per Act of Hazardous Waste (Management & Handling) Rules, 1989 is not easy. In the normal practice, the sludge is being disposed off on both sides of roads and railway tracks to fill low lying areas. This causes a severe problem, because during rains, the entire toxic compound (leachate) goes into ground and pollutes the ground water. Seeing the above problem, a study is taken for utilization of pickling sludge with fly ash to avoid the problem of disposal. Cement concrete hollow cavity bricks can be made and compressive strength of cement concrete hollow cavity brick is found to increase with addition of 7.5% TSLS (treated spent liquor sludge) and 15% fly ash as a partial replacement of cement. Formation of C-S-H gel may be contributing to increase in compressive strength.
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    Development of a low cost potato gel system for nitrate removal from water
    (RJCE, 2016-09) Shukla, Paritosh; Gupta, Rajiv; Singhal, Anupam
    This paper proposes to utilize the commonly available natural resource in form of tuber i.e. potato to treat the water for nitrate. The gel derived from potato (Solanum tuberosum) is employed for the removal of contaminant present in the water. The chosen system has shown overall 92 % reduction in nitrate concentration. Batch study was carried out to optimize the parameters (time of reaction, adsorbent weight and adsorbate concentration) followed by 144 h run of column to determine capability of adsorbent with artificial samples. Our studies showed that the batch study followed the Langmuir isotherm more closely than the Freundlich isotherm. Column data fit the Thomas model and kinetic constant is determined using Thomas equation. The maximum sorption capacity determined for adsorbent is 0.2484 mg/g. FTIR analysis of adsorbent (potato gel) at two different conditions shows changes in transmittance indicating the presence of active sites in adsorbent responsible for nitrate reduction.