Chemical oxygen demand reduction of dairy wastewater using fenton's oxidation process

Date

10-2008

Degree

Bachelor of Science in Chemical Engineering

College

College of Forestry and Natural Resources (CFNR)

Adviser/Committee Chair

Jewel A. Capunitan

Committee Member

Catalino G. Alfafara, Monet Concepcion C. Maguyon

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Abstract

The effectiveness of Fenton’s oxidation process in the chemical oxygen demand (COD) reduction of dairy wastewater was assessed. The effects of varying the amounts of hydrogen peroxide and iron catalyst on percent COD reduction were investigated. Two treatment levels were employed to 25 mL dairy wastewater with initial COD of 177,400 ppm. The first treatment level involved varying volumes of 50% (w/w) hydrogen peroxide (10, 15, 20, 25 and 30 mL) at constant volume of FeSO4•7H2O solution. The second treatment level involved varying volumes of 10% (w/v) FeSO4•7H2O solution (2, 4, 6, 8 and 10 mL) at constant volume of hydrogen peroxide. The volumetric ratios of hydrogen peroxide to iron catalyst used to dairy wastewater in the first treatment level were 10:4:25, 15:4:25, 20:4:25, 25:4:25 and 30:4:25. The volumetric ratios of hydrogen peroxide to iron catalyst to dairy wastewater used in the second treatment level were 20:2:25, 20:4:25, 20:6:25, 20:8:25 and 20:10:25. The volume of hydrogen peroxide that exhibited the optimum percent COD reduction in the first treatment level was held constant in the second treatment level. Reaction times of each sample were recorded. An optimum percent COD reduction of 91.30% was attained for the samples treated using 4:20:25 (mL iron catalyst to mL hydrogen peroxide to mL wastewater ratio) at 45.33 minutes. The treated wastewater has COD of 7,633.33 ppm, and pH of 8.3. Preliminary cost of reagent was estimated to be Php 44.75 per liter of dairy wastewater. Although the only parameter that passed the DAO 35 Standards for discharge in inland waters was pH, the significantly high percentage of COD reduction obtained in this experiment confirmed that Fenton’s oxidation process is an effective method in reducing the COD level of dairy wastewater. Also, since the COD level has already been significantly reduced, biological method may be opted as a final treatment to further reduce the residual COD.

Language

English

LC Subject

Oxygen, Oxidation, Sewage

Location

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

Call Number

LG 993.5 2008 E62 N68

Document Type

Thesis

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