摘要
采用臭氧氧化法处理经生化处理后的焦化废水,研究了对废水中COD、NH3-N和色度的去除效果,并通过气相色谱/质谱分析了有机物在反应过程中的降解与转化情况。结果表明:在气水接触90 min时,整个系统对COD、NH3-N和色度的去除率分别达到30.3%、21.9%和64.5%。经生化处理后焦化废水的有机组分主要为芳香烃、长链烷烃、杂环化合物、邻苯二甲酸酯类难降解有机物;经臭氧氧化后,大部分难降解有机物被完全去除,一部分被分解生成了一些中间产物和衍生物,如酰氯、酮类、醇类等易降解有机物,可生化性大大提高。因此,用臭氧氧化处理经生化处理后的焦化废水,后续接一级生化处理,有望使出水水质达到《污水综合排放标准》(GB8978—1996)的一级标准。
Ozonation process was applied for the treatment of coking wastewater which was pretreated by biochemical process. The removal effects of COD, ammonia nitrogen and color were studied, and the degradation and transformation of organics during ozonation were analyzed by gas chromatography/ mass spectrum （ GC/MS）. The results indicate that when the contact time between ozone and wastewater is 90 min, the removal rates of COD, ammonia nitrogen and color are 30.3% , 21.9% and 64.5% respectively. The main organics of coking wastewater pretreated by biochemistry are some refractory compounds, such as aromatic hydrocarbons, long-chain alkanes, heterocyclic compounds, phthalic acid esters and so on. After ozonation, the majority of refractory compounds are degraded absolutely, some of which are transformed into intermediates and derivatives that are easy to degraded, such as acyl chloride, ketones and alcohols, which greatly improves the biodegradability of the coking wastewater. Therefore, it is promising for coking wastewater to attain the first class criteria specified in the Integrated Wastewater Discharge Standard （GB 8978 -1996） by using biochemical pretreatment and ozonation followed by primary biochemical treatment.
出处
《中国给水排水》
CAS
CSCD
北大核心
2011年第21期72-75,共4页
China Water & Wastewater
关键词
臭氧
生化后焦化废水
有机物降解
质谱分析
ozone
coking wastewater pretreated by biochemical process
degradation of organics
mass spectrum
