Precipitation kinetics of CuS through the removal of copper (II) from gold smelting wastewater using biogenic hydrogen sulfide in a bench scale bioreactor system

Date

10-2010

Degree

Bachelor of Science in Chemical Engineering

College

College of Engineering and Agro-Industrial Technology (CEAT)

Adviser/Committee Chair

Maria Cristina V. Mahilum

Committee Member

Butch G. Bataller, Marilyn C. Del Barrio

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Abstract

The precipitation kinetics of CuS from the reaction of copper (II) and biogenic H2S was explored in order to evaluate the design of the shop-fabricated design of precipitator that was installed in BIOTECH. The experiments were done by measuring the pressures and temperatures of precipitator and N2 tank every sparging time. Results of the experiment showed that the reaction rate is faster than the mass transfer rate as supported by the calculated enhancement factors (13.03 m-1

and 10.91 m-1 for Trial 1 and Trial 2, respectively). Therefore, it was concluded that the rate of reaction between Cu2+ and H2S is mainly controlled by the mass transfer occurring between them. The H2S gas absorption rate was calculated using the equations for two cases (gas phase and gas-liquid phase mass transfer limited regimes) derived by Ter Maat et al. (2007). In case the simplification is allowed, they said that the over-all mass transfer rate is limited by the minimum of the two boundary cases. It was found that the mass transfer rate is defined by the gas phase mass transfer limited regime with the computed average value of 0.0035 mol H2S/(m2-min). It was also tasked to assess the characteristics of gold-smelting wastewater. The experiment was able to reduce copper content from 4108 ppm to 500 ppm only. Thus, it is concluded that the laboratory study conducted by Atienza (2010) with copper reduction of 0.04 ppm provides more efficient results than this bench-scale study.

Language

English

LC Subject

Wastewater, Copper, Diagnosis, Laboratory--Equipment and supplies

Location

UPLB College of Forestry and Natural Resources (CFNR)

Call Number

LG 993.5 2010 E62 B38

Document Type

Thesis

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