School of Civil and Environmental Engineering, Georgia Institute of Technology, Atlanta, GA 30332-0512, USA.
School of Civil and Environmental Engineering, Georgia Institute of Technology, Atlanta, GA 30332-0512, USA.
Bioresour Technol. 2015 Mar;179:339-347. doi: 10.1016/j.biortech.2014.12.058. Epub 2014 Dec 20.
A commercial naphthenic acids (NAs) mixture (TCI Chemicals) and five model NA compounds were ozonated in a semibatch mode. Ozonation of 25 and 35 mg/L NA mixture followed pseudo first-order kinetics (k(obs)=0.11±0.008 min(-1); r(2)=0.989) with a residual NAs concentration of about 5 mg/L. Ozone reacted preferentially with NAs of higher cyclicity and molecular weight and decreased both cyclicity and the acute Microtox® toxicity by 3.3-fold. The ozone reactivity with acyclic and monocyclic model NAs varied and depended on other structural features, such as branching and the presence of tertiary or quaternary carbons. Batch aerobic degradation of unozonated NA mixture using a NA-enriched culture resulted in 83% NA removal and a 6.7-fold decrease in toxicity, whereas a combination of ozonation-biodegradation resulted in 89% NA removal and a 15-fold decrease in toxicity. Thus, ozonation of NA-bearing waste streams coupled with biodegradation are effective treatment processes.
一种商业环烷酸（NAs）混合物（TCI 化学品）和五种模型 NA 化合物在半分批模式下进行臭氧化处理。25 和 35 mg/L 的 NA 混合物的臭氧化遵循准一级动力学（k（obs）=0.11±0.008 min(-1)；r(2)=0.989），残留的 NAs 浓度约为 5 mg/L。臭氧优先与更高环数和分子量的 NAs 反应，使环数和急性 Microtox®毒性降低了 3.3 倍。无环和单环模型 NA 的臭氧反应性不同，这取决于其他结构特征，如支链和叔碳或季碳的存在。使用富含 NA 的培养物对未臭氧化的 NA 混合物进行批式好氧降解，导致 83%的 NA 去除和毒性降低 6.7 倍，而臭氧化-生物降解的组合导致 89%的 NA 去除和毒性降低 15 倍。因此，臭氧化含 NA 的废水与生物降解相结合是有效的处理工艺。
