碱激活PMS氧化法协同SBBR深度处理焦化废水研究

Advanced treatment of coking wastewater with peroxymonosulfate oxidation activated by base combined with SBBR

采用碱激活过一硫酸盐(PMS)氧化法协同序批式生物膜反应器(SBBR)工艺深度处理焦化废水,研究当以NaOH作为激活剂时,pH、PMS浓度和温度对碱/PMS体系去除焦化废水生化出水COD和色度的影响,之后考察SBBR工艺处理碱/PMS体系出水的效果。研究结果表明,碱/PMS体系深度处理焦化废水的最佳条件为温度25℃、pH=10、PMS投加浓度7 mmol/L、反应时间4 h,在此条件下色度和COD的去除率分别为96.1%和45.9%。电子顺磁共振实验表明碱/PMS体系存在^(1)O_(2)、O_(2)•-、∙OH和SO_(4)•-等活性氧物种。废水经碱/PMS体系处理后可生化性提高,之后经SBBR工艺进一步处理后出水COD<60 mg/L。总体而言,碱激活PMS氧化法协同SBBR工艺对COD的平均去除率达66.7%。焦化废水生化出水处理前后的三维荧光光谱分析表明,碱/PMS体系协同SBBR工艺能去除焦化废水生化出水中的芳香蛋白类物质和类腐殖酸物质。

The advanced treatment of bio-treated coking wastewater was carried out using peroxymonosulfate(PMS)oxidation activated by base combined with sequencing biofilm batch reactor(SBBR).The effects of pH,PMS concen-tration,and temperature on the removal of COD and chroma of bio-treated coking wastewater were investigated by base/PMS system with sodium hydroxide as activater.The optimal conditions were temperature of 25℃,pH of 10,PMS concentration of 7 mmol/L,reaction time of 4 h.Under this condition,the removal rates of COD and chroma were 45.9% and 96.1%,respectively.EPR analyse indicated that ^(1)O_(2),O_(2)·-,∙OH and SO_(4)·-existed in the base/PMS system.After base/PMS system,the biodegradabality of waste water improved.The COD of effluent after SBBR treat-ment was less than 60 mg/L.The average removal rate of COD reached 66.7% with PMS oxidation activated by base combined with sequencing biofilm batch reactor.The three-dimensional fluorescence spectrum showed that the base/PMS system combined with SBBR could remove aromatic-like protein substances and humic-like acids.