Parametric Study on Solidification/Stabilization of Chromium Containing Laboratory Waste using Rice Straw Ash as Binder

Author : Mendoza, Kate Lesley Miñas
Major Adviser : Migo-Sumagang, Maria Victoria P.
Committee Members : Arocena, Rhebner E.; Migo, Veronica P.
Year : 2018
Month : June
Type : Thesis
Degree: BS
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Solidification/Stabilization of COD waste using rice straw ash (RSA) as binder was studied. The component proportions of RSA, sludge and ordinary Portland cement (OPC) were varied; and a water to solids ratio of 0.60 was used and a curing time of 14 days was allotted. The effect of the variation to the chromium leachability was measured through the toxicity characteristic leaching procedure (TCLP) test. The three components were subjected to x-ray fluorescence analysis and Cr concentration of 4.9, 1204.9 and 5.9 ppm were detected from RSA, sludge and OPC, respectively. Results showed that all factors—RSA, sludge and OPC, are significant, as well as the interactions of sludge-RSA and RSA-OPC. Also, all the design points have chromium retention of 97 to 98%, and the best result among the runs passed the 5 ppm DENR limit for chromium leachability. The composition proportion of the run with the best result was used as basis for the preliminary cost estimation of the s/s process. Comparison of the estimated cost of COD treatment using s/s with the cost of the existing COD treatment was done. The cost of s/s treatment was calculated to be Php 17.00 per kg of COD waste which is lower compared to the Php 75.00 per kg of COD waste cost of the existing treatment by Allwaste.

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