Koolivand Ali, Naddafi Kazem, Nabizadeh Ramin, Saeedi Reza
a Department of Environmental Health Engineering, Faculty of Health , Arak University of Medical Sciences , Arak , Iran.
b Department of Environmental Health Engineering, School of Public Health , Tehran University of Medical Sciences , Tehran , Iran.
Environ Technol. 2018 Oct;39(20):2597-2603. doi: 10.1080/09593330.2017.1362037. Epub 2017 Oct 4.
In this research, removal of petroleum hydrocarbons from oily sludge of crude oil storage tanks was investigated under the optimized conditions of in-vessel composting process and chemical oxidation with HO and Fenton. After determining the optimum conditions, the sludge was pre-treated with the optimum state of the oxidation process. Then, the determined optimum ratios of the sludge to immature compost were composted at a C:N:P ratio of 100:5:1 and moisture content of 55% for a period of 10 weeks. Finally, both pre-treated and composted mixtures were again oxidized with the optimum conditions of the oxidants. Results showed that total petroleum hydrocarbons (TPH) removal of the 1:8 and 1:10 composting reactors which were pre-treated with HO were 88.34% and 90.4%, respectively. In addition, reduction of TPH in 1:8 and 1:10 composting reactors which were pre-treated with Fenton were 83.90% and 84.40%, respectively. Without applying the pre-treatment step, the composting reactors had a removal rate of about 80%. Therefore, pre-treatment of the reactors increased the TPH removal. However, post-oxidation of both pre-treated and composted mixtures reduced only 13-16% of TPH. Based on the results, remarkable overall removal of TPH (about 99%) was achieved by using chemical oxidation and subsequent composting process. The study showed that chemical oxidation with HO followed by in-vessel composting is a viable choice for the remediation of the sludge.
本研究在原油储罐含油污泥的容器内堆肥工艺以及用羟基自由基（HO）和芬顿试剂进行化学氧化的优化条件下，对去除其中的石油烃进行了研究。确定最佳条件后，污泥采用氧化工艺的最佳状态进行预处理。然后，将确定的污泥与未成熟堆肥的最佳比例按照碳氮磷比100:5:1和含水量55%进行堆肥处理，为期10周。最后，对预处理和堆肥后的混合物再次采用氧化剂的最佳条件进行氧化。结果表明，用HO预处理的1:8和1:10堆肥反应器中石油总烃（TPH）的去除率分别为88.34%和90.4%。此外，用芬顿试剂预处理的1:8和1:10堆肥反应器中TPH的减少量分别为83.90%和84.40%。不进行预处理步骤时，堆肥反应器的去除率约为80%。因此，对反应器进行预处理提高了TPH的去除率。然而，对预处理和堆肥后的混合物进行后氧化仅使TPH减少了13 - 16%。基于这些结果，通过化学氧化和后续堆肥工艺实现了TPH的显著总体去除（约99%）。该研究表明，先用HO进行化学氧化，然后进行容器内堆肥是修复污泥的可行选择。
