Removal of chromium VI (Cr 6+) from COD (chemical oxygen demand) waste water using Rhizobium sp. (BJVr-12) cells on coconut husk and its recovery

Date

11-2003

Degree

Bachelor of Science in Chemistry

College

College of Arts and Sciences (CAS)

Adviser/Committee Chair

Estella T. Paner

Abstract

ABSTRACT

LEONNIE PEARL NANGGAN MOSQUERA. College of Arts and Sciences. University of the Philippines Los Banos. November, 2003. Removal of Chromium (Cr6+) from Chemical Oxygen Demand (COD) Wastewater Using Rhizobium sp. (BJVr-I2) Cells on Coconut Husk and Its Recovery.

Adviser Estella T. Paner

Co-Adviser: Josefina L. Solivas

The capacity of coconut husk with exopolysaccharides(EPS) from Rhizobium sp. (BJVr-12) to remove hexavalent chromium from Chemical Oxygen Demand (COD) wastewater was studied. One gram of coconut husk with EPS removed a maximum of 90% chromium (VI) from 50 mL COD wastewater after 4 hours of shaking compared to the coconut husk alone with 78.18% chromium (VI) reduction after 2 hours of shaking.

The Freundlich constant, K for coconut husk with EPS is 0.0098 rnM Cr6+g-1 dry biomass, and the Langmuir constant, Qo is 0.0127 mM Cr6+g-1 dry biomass. The r2 in the linear graph both for Freundlich and Langmuir are 0.923 and 0.967 respectively. With the value of Langmuir r2 nearer to 1, this suggests that the biosorption of chromium (VI) by coconut husk with EPS involves a monolayer adsorption and constant energy of adsorption under low chromiumion concentration.

The recovery of the adsorbed chromium was done using 6 M HCI. One hour of shaking removed 78% chromium (V1) from the used coconut husk with EPS compared to 76% chromium desorption of two hours shaking. This shows that there is no significant difference between the two time intervals, both with significant recovery of chromium from the coconut husk with EPS.

Language

English

Location

UPLB Main Library Special Collections Section (USCS)

Call Number

LG 993.5 2003 C4 M67

Document Type

Thesis

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