Shaanxi Province Key Laboratory of Environmental Pollution Control and Reservoir Protection Technology of Oilfields, Xi'an Shiyou University, Xi'an 710065, China.
Shaanxi Key Laboratory of Lacustrine Shale Gas Accumulation and Exploitation, Xi'an 710065, China; Research Institute of Yanchang Petroleum (Group) Company Limited, Xi'an 710065, China.
Ecotoxicol Environ Saf. 2021 Jan 15;208:111673. doi: 10.1016/j.ecoenv.2020.111673. Epub 2020 Nov 21.
In the present research, a bioremediation process was developed using solid complex bacterial agents (SCBA) through a combined two-step biodegradation process. Four isolated strains showed high efficiency for the degradation of total petroleum hydrocarbons (TPH) and the reduction of COD of the oily sludge, at 96.6% and 92.6%, respectively. The mixed strains together with bran prepared in form of SCBA exhibited improved performance compared to individual strains, all of which had an optimal temperature of around 35 °C. The use of SCBA provided advantages over commonly used liquid media for storage and transportation. The two-step process, consisting of firstly biosurfactant-assisted oil recovery and secondly biodegradation of the remaining TPH with SCBA, demonstrated the capability for treating oily sludge with high TPH content (>10 wt%) and short process period (60 days). The large-scale (5 tons oily sludge) field test, achieving a TPH removal efficiency of 93.8% and COD reduction of 91.5%, respectively, confirmed the feasibility and superiority of the technology for industrial applications.
在本研究中，通过两步生物降解过程，使用固体复合细菌剂（SCBA）开发了一种生物修复工艺。四种分离的菌株对总石油烃（TPH）的降解和含油污泥 COD 的降低表现出高效率，分别为 96.6%和 92.6%。与单独的菌株相比，混合菌株与制备成 SCBA 的麸皮一起表现出了更好的性能，所有菌株的最佳温度约为 35°C。与常用的液体培养基相比，SCBA 在储存和运输方面具有优势。两步工艺包括首先用生物表面活性剂辅助采油，然后用 SCBA 生物降解剩余的 TPH，证明了该技术能够处理高 TPH 含量（>10wt%）和短处理期（60 天）的含油污泥。在 5 吨含油污泥的大规模现场试验中，TPH 去除效率分别达到 93.8%和 COD 降低 91.5%，分别证实了该技术在工业应用中的可行性和优越性。
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