温和的高温高压条件对磺化沥青可生物降解性的影响
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摘要
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7MPa,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%,CODB/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。
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 CODB/COD was 0.82 with the rate constant of the fi rst 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 signifi cantly while that of low molecular weight linear alkanes increased.
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 CODB/COD was 0.82 with the rate constant of the fi rst 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 signifi cantly while that of low molecular weight linear alkanes increased.
引文
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[2]樊泽霞,王杰祥,王兰兰,等.磺化渣油用作油溶性稠油降黏剂YCJ的研制[J].油田化学,2007,24(2):103-105.
[3]宋相丹,刘有智,姜秀平,等.磺化剂及磺化工艺技术研究进展[J].当代化工,2010,39(1):83-85.
[4]ZHANG C M,SONG Y L,WANG W,et al.The influence of sulfonated asphalt on the mechanical properties and microstructure of oil well cement paste[J].Construction and Building Materials,2017,132:438-445.
[5]MEDILL M.Treatment for oxidation of organic material in supercritical water:US4338199[P].1982.
[6]张文浩,尚宏志,刘希文.亚硫酸制浆废液CODB与BOD5的相关性研究[J].气象与环境学报,2006,22(6):69-71.
[7]MALIK S N,SARATCHANDRA T,TEMBHEKAR PD,et al.Wet air oxidation induced enhanced biodegradability of distillery effluent[J].J Environ Manage,2014,136:132-138.
[8]北京市化工研究院.水质化学需氧量的测定重铬酸盐法:GB 11914-1989[S].北京:中国标准出版社,1989:211-213.
[9]郑莉,黄绍松.环境微生物学实验[M].广州:华南理工大学出版社,2012:61-62.
[10]张晓林,邹道安,池涌.十氯联苯的超(亚)临界水降解特性[J].环境科学学报,2015,35(7):2099-2106.
[11]PINTO L D,DOS-SANTOS L M F,ALDURI B,et al.Supercritical water oxidation of quinoline in a continuous plug flow reactor part 1:effect of key operating parameters[J].J Chem Technol Biotechnol,2006,81(6):912-918.
[12]PADOLEY K V,TEMBHEKAR P D,SARATCHAN-DRA T,et al.Wet air oxidation as a pretreatment option for selective biodegradability enhancement and biogas generation potential from complex effluent[J].Bioresour Technol,2012,120:157-164.
[13]倪金平,张效敏,王海量,等.纤维素超/亚临界水水解研究进展[J].高分子通报,2012(6):43-48.
[14]高拯民,李宪法.城市污水土地处理利用设计手册[M].北京:中国标准出版社,1991:18-28.
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