Naphthenic acids speciation and removal during petroleum-coke adsorption and ozonation of oil sands process-affected water
Naphthenic acids speciation and removal during petroleum-coke adsorption and ozonation of oil sands process-affected water
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DOI：
10.1016/j.scitotenv.2011.08.033
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发表时间：
2011-11-01
影响因子：
9.8
通讯作者：
Smith, Daniel W.
中科院分区：
文献类型：
--
作者：
El-Din, Mohamed Gamal;Fu, Hongjing;Smith, Daniel W.
阿萨巴斯卡油砂行业在沥青提取和升级过程中产生大量油砂工艺影响水 (OSPW)。 OSPW 的成分包括氯化物、环烷酸 (NA)、芳香烃、痕量重金属以及其他无机和有机化合物。为了解决与 OSPW 回收和/或安全返回环境相关的环境问题，需要水处理技术。这项研究首次研究了预处理步骤（包括过滤和石油焦吸附）对分区要求和性能的影响。还检查了初始 OSPW pH 对处理性能的影响，以及臭氧化的演变及其对 OSPW 毒性和生物降解性的影响。使用半间歇式臭氧化系统，在臭氧使用剂量为 150 mg/L 时，可降解超过 76% 的总酸可萃取有机物。在臭氧使用剂量为 100 mg/L 时，处理后的 OSPW 变得更具生物降解性，并且对费氏弧菌没有毒性。臭氧化后观察到 NA 分布在碳数和环数方面的变化。 OSPW 的过滤并没有改善臭氧化性能。研究发现，石油焦吸附可有效将酸可萃取有机物总量减少 91%，NA 含量减少 84%，OSPW 毒性从 4.3 毒性单位减少至 1.1 毒性单位。这项研究的结果表明，石油焦吸附和臭氧化相结合是一种有前途的处理 OSPW 的方法。 (C) 2011 Elsevier B.V. 保留所有权利。
The Athabasca Oil Sands industry produces large volumes of oil sands process-affected water (OSPW) as a result of bitumen extraction and upgrading processes. Constituents of OSPW include chloride, naphthenic acids (NAs), aromatic hydrocarbons, and trace heavy metals, among other inorganic and organic compounds. To address the environmental issues associated with the recycling and/or safe return of OSPW into the environment, water treatment technologies are required. This study examined, for the first time, the impacts of pretreatment steps, including filtration and petroleum-coke adsorption, on zonation requirements and performance. The effect of the initial OSPW pH on treatment performance, and the evolution of ozonation and its impact on OSPW toxicity and biodegradability were also examined. The degradation of more than 76% of total acid-extractable organics was achieved using a semi-batch ozonation system at a utilized ozone dose of 150 mg/L With a utilized ozone dose of 100 mg/L, the treated OSPW became more biodegradable and showed no toxicity towards Vibrio fischeri. Changes in the NA profiles in terms of carbon number and number of rings were observed after ozonation. The filtration of the OSPW did not improve the ozonation performance. Petroleum-coke adsorption was found to be effective in reducing total acid-extractable organics by a 91%, NA content by an 84%, and OSPW toxicity from 4.3 to 1.1 toxicity units. The results of this study indicate that the combination of petroleum-coke adsorption and ozonation is a promising treatment approach to treat OSPW. (C) 2011 Elsevier B.V. All rights reserved.