Optimizing potassium ferrate for textile wastewater treatment by RSM
Background: Application of potassium ferrate is a chemical oxidation approach used for water and wastewater treatment. The aim of this study is to apply central composite design (CCD) and response surface methodology (RSM) to optimize potassium ferrate consumption in the treatment of wastewater f...
Main Authors: | , , , |
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Format: | Article |
Language: | English |
Published: |
Kerman University of Medical Sciences
2016-08-01
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Series: | Environmental Health Engineering and Management |
Subjects: | |
Online Access: | http://ehemj.com/browse.php?a_id=194&slc_lang=en&sid=1&ftxt=1 |
Summary: | Background: Application of potassium ferrate is a chemical oxidation approach used for water and
wastewater treatment. The aim of this study is to apply central composite design (CCD) and response
surface methodology (RSM) to optimize potassium ferrate consumption in the treatment of wastewater
from carpet industries.
Methods: Samples in this experimental study were collected from wastewater, originating from a carpet
factory. Wastewater sampling was carried out monthly for a period of two seasons. Ferrate oxidation
experiments were conducted by means of a conventional jar-test apparatus. The time and speed for mixing
were set with an automatic controller. Parameters of study were measured based on given methodologies
in Standard method for examining water and wastewater. CCD and RSM were applied to optimize the
operating variables including potassium ferrate dosage and pH.
Results: Results showed that potassium ferrate concentration (A), pH (B), their interactions (AB) and
quadratic effects (A2 and B2) were significant in the removal of COD, turbidity, color and TSS from carpet
industries effluents. At an optimum point (COD: 160 mg/L of potassium ferrate and pH 4, turbidity: 165
mg/L of potassium ferrate and pH 4, color and TSS: pH 4.5 and 150 mg/L of potassium ferrate) removal
efficiencies for COD, turbidity, color and TSS were 86, 86, 87 and 89%, respectively.
Conclusion: Potassium ferrate has a significant impact on pollutants decomposition and the removal of
color from wastewater produced in carpet industries. This process can be employed for the pretreatment
or post treatment of wastewaters containing refractory organic pollutants. CCD and RSM are suitable
tools for experimental design. |
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ISSN: | 2423-3765 2423-4311 |