Cement-based Solidification/Stabilization of Chromium from Tannery Wastewater using Municipal Solid Waste Fly Ash as Admixture

Author : Mendoza, Jeus Kim Ciudad
Major Adviser : Detras, Monet Concepcion M.
Committee Members : Bambase Jr. Manolito E.; Migo, Veronica P.
Year : 2020
Month : July
Type : Thesis
Degree: BS
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Abstract

Increasing generation of municipal solid waste (MSW) and chrome-laden tannery wastewater pose environmental problems in the Philippines. To address this, solidification/stabilization (S/S) can be applied through encapsulation and immobilization of contaminants in a cement matrix. This study aims to evaluate the S/S technology in treating chromium-containing tannery wastewater using MSW fly ash (MSWFA) as admixture. The MSWFA generated by the proposed 1000 tpd Quezon City Waste-to-Energy (WtE) facility will be utilized in treating the chromium after alkali-precipitation of tannery wastewater. Reviewed studies show Al₂O₃, SiO₂, and CaO content of MSWFA primarily provide strength development in cement. The mixture 58% OPC + 40% FA + sludge + 2% Na₂CO₃ was found to be the best condition for S/S of Cr and is expected to have a maximum 0.54 MPa compressive strength and minimum 0.137 mg/L Cr leaching according to Cerbo, et al (2016). Cost analysis of the treatment resulted to ₱ 61.54/L of tannery wastewater and 3.4033 kg MSW FA is utilized. Comparative analysis showed S/S as a cost-effective and relatively rapid treatment compared to adsorption and biological treatment. However, S/S may be ineffective in treating organic wastes and has unpredictable behavior due to environmental factors. The future of S/S technology leans on the use of self-healing and greener binders, AI assisted assessment of long term effects and increase in actual application to organic wastes.

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