Chromium Removal from Chrome-Tannery Effluent after Alkaline Precipitation by Adsorption using Municipal Solid Waste-Derived Activated Biochar

Author : Parañaque, Julienne Eris Leones
Major Adviser : Detras, Monet Concepcion M.
Committee Members : Alfafara, Catalino G.; Migo, Veronica P.
Year : 2019
Month : June
Type : Thesis
Degree: BS
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Abstract

The reduction of MSW and treatment of toxic wastewater are common concerns in the country recently. Hence in this study, activated biochar derived from municipal solid wastes (MSWAB) was used to treat alkaline-precipitated tannery wastewater by adsorption to meet the 0.5 ppm Crtotal concentration set by DENR. Alkaline precipitation reduced the chromium concentration by 99.67 % of the Crtotal concentration. An average yield of 50.42 % w/w biochar was obtained. The biochar produced was activated using KOH to improve adsorption capacity and yielded 98.76 % wt/wt. The residual chromium concentration became constant at 1 hour of adsorption. The effect of pH and adsorbent dosage on the Crtotal removal were tested from pH 6.5 to 12 and from 0.2 to 10 mg MSWAB/ mL wastewater, respectively. Using 2k factorial of DX11, the two factors were significant on the percent removal of Crtotal. However, the heterogeneous composition of the MSWAB had affect the adsorption of Cr which was the possible reason on the significant lack of fit of the model. The adsorption of MSWAB reached 98.97 % Crtotal removal at pH 12 with 10 mg/mL dosage. Freundlich isotherm best described the adsorption using MSWAB with R² equal to 0.8231 as compared to the 0.5079 of the Langmuir isotherm. The performance of commercial activated carbon (CAC) with a removal of 57.39 % was compared to the 55 % removal using MSWAB at pH 8.5. With the low cost of feedstock used and its adsorption performance, MSWAB can be a possible alternative for CAC.

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