化工学报2009，Vol.60Issue(12)：3089-3096,8.
焦化废水中硫氰化物的生物降解及其与苯酚、氨氮的交互影响
Biodegradation of thiocyanate and inhibitory interaction with phenol, ammonia in coking wastewater
摘要
Abstract
Thiocyanate (SCN~-) is one of the main contaminants in coking wastewater and has non-neglectable contribution to COD, chroma and NH_4~+-N value. The interactive inhibitory reaction of SCN~-with other pollutants would affect the selection of treatment technology and the draining water quality control. In this study, the SCN~- degradation kinetics was investigated using activated sludge of coking wastewater. Effects of phenol on SCN~- degradation and SCN~- on nitrification were also studied in order to assess the interaction of SCN~- with other pollutants. Under specified culture condition, the degradation rate of SCN~- reached up to 20.15 mg SCN~- · (g MLSS)~(-1) · H~(-1) and the sludge activity was not significantly affected by the initial concentration of SCN~-. The SCN~- degradation process follows the Michaelis-Menten model. Experiment results indicated that phenol has toxic inhibition on SCN~-degradation, with 738 mg · L~(-1) phenol, the complete degradation time of 108 mg · L~(-1) SCN~- was delayed from 1. 5 h to 20 h. On the other hand, SCN~- also inhibits the nitrification of NH_4~+ , especially for the conversion of nitrite to nitrate, which resulted in the accumulation of NO_2~-. Hence, the inhibitory interactions of thiocyanate with phenol and ammonia make the treatment of coking wastewater more complicated and difficult. Thus, for the pollution control of coking wastewater, it should identify the interaction effects among main contaminants, consider the adaptation of sludge activity with pollutants concentrations from the point of co-substrate effect or poisonous effect, which would give help in establishing an optimized biological treatment technology.关键词
焦化废水/硫氰化物/生物降解/交互干扰Key words
coking wastewater/ thiocyanate/ biodegradation/ inhibitory interaction分类
资源环境引用本文复制引用
潘霞霞,李媛媛,黄会静,任源,韦朝海..焦化废水中硫氰化物的生物降解及其与苯酚、氨氮的交互影响[J].化工学报,2009,60(12):3089-3096,8.基金项目
"十一五"国家科技支撑计划重点项目(2008BAC32B06-1) （2008BAC32B06-1）
国家高技术研究发展计划项目(2006AA06Z378) （2006AA06Z378）
国家自然科学基金项目(20977035). （20977035）
