温和的高温高压条件对磺化沥青可生物降解性的影响

在氮气氛围下,采用温和的高温高压对模拟磺化沥青废水进行预处理,考察了预处理时间、温度和压力对磺化沥青可生物降解性的影响,得出最佳工艺条件为预处理时间40 min,预处理温度220 ℃,预处理压力7 MPa,采用最佳条件预处理后的磺化沥青废水经活性污泥处理后,COD去除率达80.0%,COD_B/COD为0.82,一级反应速率常数达0.123 5 h^-1。对预处理前后磺化沥青的表征结果显示,经高温高压处理后的磺化沥青主要成分仍是烷烃和芳香族化合物等,但发生了脱磺水解反应,长链烷烃和苯系物的含量大幅下降,低分子量直链烷烃含量升高。

Effect of mild high temperature and high pressure on biodegradability of sulfonated asphalt

The simulated sulfonated asphalt wastewater was pretreated with a method of mild high temperature and high pressure in nitrogen atmosphere. The effects of pretreatment time,temperature and pressure on the biodegradability of sulfonated asphalt were investigated. The results showed that pretreatment time 40 min,pretreatment temperature 220 ℃ and pretreatment pressure 7 MPa were the optimum conditions. After the sulfonated asphalt wastewater pretreated with optimal conditions was treated with activated sludge,the COD removal rate was 80.0% and COD_B/COD was 0.82 with the rate constant of the first order reaction being 0.123 5 h^-1. The characterization of the sulfonated asphalt before and after pretreatment indicated that the main components of the sulfonated asphalt were still alkanes and aromatic compounds after the high temperature and high pressure treatment. However,the desulfonation hydrolysis reaction was took place,and then the contents of long chain alkanes and benzene series decreased significantly while that of low molecular weight linear alkanes increased.