Electrochemical decolorization and Chemical Oxygen Demand (COD) reduction of colored- paper-manufacturing wastewater

Date

4-2011

Degree

Bachelor of Science in Chemical Engineering

College

College of Engineering and Agro-Industrial Technology (CEAT)

Adviser/Committee Chair

Catalina G. Alfafara

Committee Member

Jerico R. Aguila, Ma. Cristina V. Mahilum

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Abstract

Electrochemical oxidation of dye wastewater from a local colored-paper manufacturing industry was investigated utilizing naturally occurring or supplemented presence of chloride ions. The decolorization and chemical oxygen demand (COD) reduction efficiencies were explored at different levels of constant operating current ands NaCI supplementation. Increase in initial decolorization rate and COD reduction were observed with increasing operating current and level of chloride supplementation until a limiting value is achieved. The optimum operating condition for the electrolytic process (based on charge dose calculations) was determined to be 3.0g/L NaCI supplementation at 7.0 A with corresponding charge doses of 295.64 Coulomb/Abs-L and 4.88 Coulomb/mg, and removal efficiencies of 99.98% and 69.48%, for color removal and COD reduction, respectively. The wastewater became almost completely biodegradable after electrooxidation, with a BOD₅ to COD ratio of 0.94. UV and IR spectra of the effluent after electrooxidation showed that color destruction may be due to the disruption of the color-causing conjugated system of double bonds in the dye molecule. Due to the extraordinarily high strength of the wastewater, the treatment costs were estimated to be PhP1,256.71/m³ for color removed and PhP7,928.07m³ for COD reduced. Practical and cost-effective application of electrooxidation for colored-paper manufacturing effluent may be as a first stage treatment for complete decolorization and biodegradability improvement, prior to second-stage biological treatment.

Language

English

LC Subject

Wastewater, Land treatment of wastewater, Pulp and Paper Technology, Decolorization

Location

UPLB College of Engineering and Agro-Industrial Technology (CEAT)

Call Number

LG 993 2011 E62 C35

Document Type

Thesis

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