Hasanzadeh Reyhaneh, Abbasi Souraki Behrooz, Pendashteh Alireza, Khayati Gholam, Ahmadun Fakhru'l-Razi
Department of Chemical Engineering, Faculty of Engineering, University of Guilan, Rasht, Iran; Department of Water and Environmental Engineering, Caspian Sea Basin Research Center, University of Guilan, Rasht, Iran..
Department of Chemical Engineering, Faculty of Engineering, University of Guilan, Rasht, Iran.
J Hazard Mater. 2020 Dec 5;400:123197. doi: 10.1016/j.jhazmat.2020.123197. Epub 2020 Jun 12.
Salinity expressed as total dissolved solids (TDS), is the most challenging parameter in bioremediation of produced water which may inhibit the microbial activities and cause sedimentation problems. The present study explores the feasibility of using walnut shell as an inexpensive and accessible adsorbent-carrier for the immobilization of isolated halophilic microorganisms for treatment of synthetic oilfield produced water. The moving bed biofilm reactor (MBBR) was examined with influent chemical oxygen demand (COD) concentrations from 900 to 3600 mg L, TDS concentrations from 35,000-200,000 mg L, and cycle times from 24 to 72 h. Comparison of the MBBR with the conventional sequencing batch reactor (SBR) indicated that both systems operated at lower influent COD and TDS concentrations satisfactorily; but at higher TDSs (above 150,000 mg L) the MBBR was more resistant to the shocks of toxicity (salinity) and organic load relative to the SBR. Also, the effluent turbidity was lower and the free sludge settling property was more favorable in the MBBR with average sludge volume index (SVI) of 38.8 mL g compared to the SBR with SVI of 98.09 mL g. Microbial identification confirmed the presence of eight dominant halophilic species which were hydrocarbon degraders and/or denitrifiers.
以总溶解固体（TDS）表示的盐度是采出水中生物修复最具挑战性的参数，它可能会抑制微生物活性并导致沉淀问题。本研究探讨了使用核桃壳作为一种廉价且易于获取的吸附剂载体来固定分离出的嗜盐微生物，以处理合成油田采出水的可行性。对移动床生物膜反应器（MBBR）进行了测试，进水化学需氧量（COD）浓度为900至3600 mg/L，TDS浓度为35000 - 200000 mg/L，循环时间为24至72小时。将MBBR与传统序批式反应器（SBR）进行比较表明，两个系统在较低进水COD和TDS浓度下均能令人满意地运行；但在较高TDS（高于150000 mg/L）时，相对于SBR，MBBR对毒性（盐度）和有机负荷冲击的耐受性更强。此外，MBBR的出水浊度更低，自由污泥沉降性能更优，其平均污泥体积指数（SVI）为38.8 mL/g，而SBR的SVI为98.09 mL/g。微生物鉴定证实存在八种主要嗜盐菌种，它们是烃降解菌和/或反硝化菌。
