Date

3-2009

Degree

Bachelor of Science in Chemical Engineering

College

College of Engineering and Agro-Industrial Technology (CEAT)

Adviser/Committee Chair

Amelia E. Parao

Co-adviser

Fidel Rey P. Nayne, Jr.

Committee Member

Catalino G. Alfafara, Jovita L. Movillon

Abstract

The efficacy of Rhizobium sp. exopolysaccharide (EPS) and system for the removal of nickel ions from synthetic and electroplating wastewaters was evaluated. The actual wastewater was found to contain 731ppm nickel. It has an initial pH of 2.91, initial COD value of 239ppm, and a mint green color. Malunggay protein was partially-purified using ammonium sulfate precipitation. It was found that partially-purified using ammonium sulfate precipitation. It was found that partially-purified MOSE contained 87.04% protein. The effect of pH in the treatment was assessed and it was found that the best pH for removal is at pH 8.02. On the other hand, optimization of the dosage of EPS and pMOSE showed that 1:1 mass ratio resulted to the highest nickel removal. Increase ratio of EPS showed a decrease in the percentage removal of nickel ions possibly due to the charge reversal that leads to loose flocs making filtration difficult. Increasing the dose of EPS and pMOSE while maintaining the 1:1 mass ratio leads to lower values of removal may be because the applied speed is not enough to bind the nickel to the large volume of EPS. The application of optimum conditions at the initial concentration of 133.62ppm resulted to 34.08ppm final nickel concentration of 70.37% removal. This is still short of new set standard of 0.5ppm for nickel thus further dilution and application of second treatment were done. The initial concentration of 5.52ppm of nickel corresponding to 33.3x dilution resulted to 100% nickel removal and 79.88% for synthetic and actual wastewater, respectively. On the other hand, an increase in COD measurement from 7.17ppm to an average of 11.84ppm was observed. Treatment of wastewater using pMOSE increases the amount of organic carbon content of the treated wastewater since pMOSE is a natural organic polymer.

Language

English

LC Subject

Wastewater, Water--Purification, Flocculation

Call Number

LG 993.5 2009 E62 A88

Document Type

Thesis

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