Vieira P A, Vieira R B, Faria S, Ribeiro E J, Cardoso V L
Faculdade de Engenharia Química, Universidade Federal de Uberlândia, CEP 38400-902, Uberlândia, MG, Brazil.
J Hazard Mater. 2009 Sep 15;168(2-3):1366-72. doi: 10.1016/j.jhazmat.2009.03.023. Epub 2009 Mar 18.
We examined the effects of aeration interval and agitation speed in an effort to optimize the biodegradation of effluent contaminated with diesel oil and gasoline. The biodegradation process employed a C(1) mixed culture and intermittent aeration. Optimization was performed using central composite design (CCD). The independent variables were aeration interval (X(1)) and agitation speed (X(2)) and the dependent variable was the degree of removal of total petroleum hydrocarbons (TPH). The optimum aeration interval (33h) and agitation speed (110rpm) resulted in TPH removal of 75.9% after 3 days. Five hydrocarbons classes were identified using gas chromatography: paraffins, isoparaffins, olefins, naphthenics, and aromatics. The following reductions were observed: 91.8% for the paraffins, 83.3% for the isoparaffins, 80.9% for the olefins, 39.3% for the naphthenics, and 80.9% for the aromatics. In comparative studies performed under constant aeration (CA), without aeration (WA), and intermittent aeration (IA) conditions, intermittent aeration resulted in the highest TPH removals, with 90% reduction after 22 days. Under the IA condition, the degradation percentages were 99.6% for the paraffins, 94% for the isoparaffins, 95.4% for the olefins, 70.8 for the naphthenics, and 83.4% for the aromatics.
我们研究了曝气间隔和搅拌速度的影响，以优化被柴油和汽油污染的废水的生物降解过程。生物降解过程采用C(1)混合培养物和间歇曝气。使用中心复合设计（CCD）进行优化。自变量为曝气间隔（X(1)）和搅拌速度（X(2)），因变量为总石油烃（TPH）的去除程度。最佳曝气间隔（33小时）和搅拌速度（110转/分钟）在3天后使TPH去除率达到75.9%。使用气相色谱法鉴定出五类烃：链烷烃、异链烷烃、烯烃、环烷烃和芳烃。观察到以下降解率：链烷烃为91.8%，异链烷烃为83.3%，烯烃为80.9%，环烷烃为39.3%，芳烃为80.9%。在恒定曝气（CA）、无曝气（WA）和间歇曝气（IA）条件下进行的对比研究中，间歇曝气导致TPH去除率最高，22天后降低了90%。在IA条件下，链烷烃的降解率为99.6%，异链烷烃为94%，烯烃为95.4%，环烷烃为70.8%，芳烃为83.4%。
Zotero 插件