The chemical and biological characteristics of coke-oven wastewater by ozonation

E. E. Chang, Hao Jan Hsing, Pen Chi Chiang, Mei Yin Chen, Jhieh Yu Shyng

Research output: Contribution to journalArticle

59 Citations (Scopus)

Abstract

A bench-scale bubble column reactor was used to investigate the biological and chemical characteristics of coke-oven wastewater after ozonation treatment through the examination of selected parameters. Color and thiocyanate could be removed almost entirely; however, organic matter and cyanide could not, due to the inadequate oxidation ability of ozone to remove ozonated byproducts under given experimental conditions. The removal of cyanide and total organic carbon were pH-dependent and were found to be efficient under neutral to alkaline conditions. The removal rate for thiocyanate was about five times that of cyanide. The ozone consumption ratio approached to about 1 at the early stage of ozonation (time TOC) increased to 30%, indicating that easily degraded pollutants were degraded almost entirely. The effect of ozonation on the subsequent biological treatment unit (i.e., activated sludge process) was determined by observing the ratio of 5-day biological oxygen demand to chemical oxygen demand (BOD5/COD) and the specific oxygen utilization rate (SOUR). The results indicated that the contribution of ozonation to inhibition reduction was very significant but limited to the enhancement of biodegradation. The operation for ozonation of coke-oven wastewater was feasible under neutral condition and short ozone contact time in order to achieve better performance and cost savings.

Original languageEnglish
Pages (from-to)560-567
Number of pages8
JournalJournal of Hazardous Materials
Volume156
Issue number1-3
DOIs
Publication statusPublished - Aug 15 2008

Fingerprint

Coke
Coke ovens
Ozonization
biological characteristics
Ozone
Cyanides
Waste Water
Biological Oxygen Demand Analysis
Wastewater
wastewater
cyanide
ozone
Cost Savings
Sewage
Carbon
Color
Activated sludge process
Bubble columns
Oxygen
Chemical oxygen demand

Keywords

  • Biodegradation
  • Cyanide
  • Inhibition
  • Ozonation
  • Thiocyanate
  • Total organic carbon

ASJC Scopus subject areas

  • Chemical Health and Safety
  • Process Chemistry and Technology
  • Safety, Risk, Reliability and Quality
  • Environmental Engineering

Cite this

The chemical and biological characteristics of coke-oven wastewater by ozonation. / Chang, E. E.; Hsing, Hao Jan; Chiang, Pen Chi; Chen, Mei Yin; Shyng, Jhieh Yu.

In: Journal of Hazardous Materials, Vol. 156, No. 1-3, 15.08.2008, p. 560-567.

Research output: Contribution to journalArticle

Chang, E. E. ; Hsing, Hao Jan ; Chiang, Pen Chi ; Chen, Mei Yin ; Shyng, Jhieh Yu. / The chemical and biological characteristics of coke-oven wastewater by ozonation. In: Journal of Hazardous Materials. 2008 ; Vol. 156, No. 1-3. pp. 560-567.
@article{e044a252302e4d3eaf6967db609245a5,
title = "The chemical and biological characteristics of coke-oven wastewater by ozonation",
abstract = "A bench-scale bubble column reactor was used to investigate the biological and chemical characteristics of coke-oven wastewater after ozonation treatment through the examination of selected parameters. Color and thiocyanate could be removed almost entirely; however, organic matter and cyanide could not, due to the inadequate oxidation ability of ozone to remove ozonated byproducts under given experimental conditions. The removal of cyanide and total organic carbon were pH-dependent and were found to be efficient under neutral to alkaline conditions. The removal rate for thiocyanate was about five times that of cyanide. The ozone consumption ratio approached to about 1 at the early stage of ozonation (time TOC) increased to 30{\%}, indicating that easily degraded pollutants were degraded almost entirely. The effect of ozonation on the subsequent biological treatment unit (i.e., activated sludge process) was determined by observing the ratio of 5-day biological oxygen demand to chemical oxygen demand (BOD5/COD) and the specific oxygen utilization rate (SOUR). The results indicated that the contribution of ozonation to inhibition reduction was very significant but limited to the enhancement of biodegradation. The operation for ozonation of coke-oven wastewater was feasible under neutral condition and short ozone contact time in order to achieve better performance and cost savings.",
keywords = "Biodegradation, Cyanide, Inhibition, Ozonation, Thiocyanate, Total organic carbon",
author = "Chang, {E. E.} and Hsing, {Hao Jan} and Chiang, {Pen Chi} and Chen, {Mei Yin} and Shyng, {Jhieh Yu}",
year = "2008",
month = "8",
day = "15",
doi = "10.1016/j.jhazmat.2007.12.106",
language = "English",
volume = "156",
pages = "560--567",
journal = "Journal of Hazardous Materials",
issn = "0304-3894",
publisher = "Elsevier",
number = "1-3",

}

TY - JOUR

T1 - The chemical and biological characteristics of coke-oven wastewater by ozonation

AU - Chang, E. E.

AU - Hsing, Hao Jan

AU - Chiang, Pen Chi

AU - Chen, Mei Yin

AU - Shyng, Jhieh Yu

PY - 2008/8/15

Y1 - 2008/8/15

N2 - A bench-scale bubble column reactor was used to investigate the biological and chemical characteristics of coke-oven wastewater after ozonation treatment through the examination of selected parameters. Color and thiocyanate could be removed almost entirely; however, organic matter and cyanide could not, due to the inadequate oxidation ability of ozone to remove ozonated byproducts under given experimental conditions. The removal of cyanide and total organic carbon were pH-dependent and were found to be efficient under neutral to alkaline conditions. The removal rate for thiocyanate was about five times that of cyanide. The ozone consumption ratio approached to about 1 at the early stage of ozonation (time TOC) increased to 30%, indicating that easily degraded pollutants were degraded almost entirely. The effect of ozonation on the subsequent biological treatment unit (i.e., activated sludge process) was determined by observing the ratio of 5-day biological oxygen demand to chemical oxygen demand (BOD5/COD) and the specific oxygen utilization rate (SOUR). The results indicated that the contribution of ozonation to inhibition reduction was very significant but limited to the enhancement of biodegradation. The operation for ozonation of coke-oven wastewater was feasible under neutral condition and short ozone contact time in order to achieve better performance and cost savings.

AB - A bench-scale bubble column reactor was used to investigate the biological and chemical characteristics of coke-oven wastewater after ozonation treatment through the examination of selected parameters. Color and thiocyanate could be removed almost entirely; however, organic matter and cyanide could not, due to the inadequate oxidation ability of ozone to remove ozonated byproducts under given experimental conditions. The removal of cyanide and total organic carbon were pH-dependent and were found to be efficient under neutral to alkaline conditions. The removal rate for thiocyanate was about five times that of cyanide. The ozone consumption ratio approached to about 1 at the early stage of ozonation (time TOC) increased to 30%, indicating that easily degraded pollutants were degraded almost entirely. The effect of ozonation on the subsequent biological treatment unit (i.e., activated sludge process) was determined by observing the ratio of 5-day biological oxygen demand to chemical oxygen demand (BOD5/COD) and the specific oxygen utilization rate (SOUR). The results indicated that the contribution of ozonation to inhibition reduction was very significant but limited to the enhancement of biodegradation. The operation for ozonation of coke-oven wastewater was feasible under neutral condition and short ozone contact time in order to achieve better performance and cost savings.

KW - Biodegradation

KW - Cyanide

KW - Inhibition

KW - Ozonation

KW - Thiocyanate

KW - Total organic carbon

UR - http://www.scopus.com/inward/record.url?scp=44949204396&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=44949204396&partnerID=8YFLogxK

U2 - 10.1016/j.jhazmat.2007.12.106

DO - 10.1016/j.jhazmat.2007.12.106

M3 - Article

C2 - 18387739

AN - SCOPUS:44949204396

VL - 156

SP - 560

EP - 567

JO - Journal of Hazardous Materials

JF - Journal of Hazardous Materials

SN - 0304-3894

IS - 1-3

ER -