Farzadkia Mahdi, Esrafili Ali, Gholami Mitra, Koolivand Ali
1Department of Environmental Health Engineering, School of Public Health, Iran University of Medical Sciences, Tehran, Iran.
2Department of Environmental Health Engineering, Faculty of Health, Arak University of Medical Sciences, Arak, P.O. BOX: 3818146851 Iran.
J Environ Health Sci Eng. 2019 Nov 8;17(2):839-846. doi: 10.1007/s40201-019-00400-y. eCollection 2019 Dec.
The kinetic studies and effect of amendment addition on the performance of the composting process in reduction of total petroleum hydrocarbons (TPH) from petroleum contaminated soils (PCS) were investigated in the present research.
Seven composting experiments containing various mixing ratios of PCS to unfinished compost (UC) and finished compost (FC) were set up and operated for 14 weeks. The mixing rations consisted of 1:0 (as control experiment), 1:0.3, 1:0.6, and 1:1. The initial C/N/P and moisture contents of the composting piles were adjusted to 100/5/1 and 50-55%, respectively.
Results showed that 50.09-79.49% of TPH was removed in the composting experiments after 14 weeks. The highest and lowest removal rates were achieved in the ratios of 1:1 and 1:0.3, respectively. Moreover, application of UC as amendments and bulking agent is more efficient than FC. The biodecomposition of TPH was fitted to the first-order kinetic with the half lives and rate constants of 5.63-11.55 days and 0.060-0.123 d, respectively. The bacteria detected from the composting treatments were sp., sp., and sp.
The study confirmed the suitability of composting process for PCS bioremediation and superiority of UC than FC as bulking agent.
本研究调查了动力学研究以及添加改良剂对堆肥过程从石油污染土壤（PCS）中减少总石油烃（TPH）性能的影响。
设置了七个堆肥实验，包含不同比例的PCS与未完成堆肥（UC）和完成堆肥（FC）的混合比例，并运行14周。混合比例包括1:0（作为对照实验）、1:0.3、1:0.6和1:1。堆肥堆的初始碳/氮/磷和水分含量分别调整为100/5/1和50 - 55%。
结果表明，14周后堆肥实验中TPH的去除率为50.09 - 79.49%。去除率最高和最低的比例分别为1:1和1:0.3。此外，使用UC作为改良剂和膨松剂比FC更有效。TPH的生物降解符合一级动力学，半衰期和速率常数分别为5.63 - 11.55天和0.060 - 0.123 d⁻¹。从堆肥处理中检测到的细菌有 菌属、 菌属和 菌属。
该研究证实了堆肥过程对PCS生物修复的适用性以及UC作为膨松剂比FC的优越性。
