Mohanakrishna Gunda, Al-Raoush Riyadh I, Abu-Reesh Ibrahim M, Pant Deepak
Department of Civil and Architectural Engineering, College of Engineering, Qatar University P O Box 2713 Doha Qatar
Department of Chemical Engineering, College of Engineering, Qatar University P O Box 2713 Doha Qatar.
RSC Adv. 2019 Dec 13;9(71):41409-41418. doi: 10.1039/c9ra06957g.
A pristine soil environment supports a healthy soil biodiversity, which is often polluted with recalcitrant compounds. The bioelectrochemical remediation of the contaminated soils using bioelectrochemical systems (BESs) is gaining significant attention with respect to the restoration of the soil ecosystem. In this direction, a microbial fuel cell (MFC, an application of BES), was employed for the treatment of total petroleum hydrocarbons (TPHs) in a soil microenvironment at three ranges of pollution (loading conditions - 320, 590 and 840 mg TPH per L). TPHs degraded effectively in the soil-electrode vicinity in the range of 158 mg TPH per L (320 mg TPH per L) and 356 mg TPH per L (840 mg TPH per L). The study also demosntrated a maximum bioelectrogenesis of 286.7 mW m (448 mV at 100 Ω) at the highest TPH loading concentration studied (840 mg TPH per L). The conditions prevailing in the soil MFC also facilitated the removal of sulfates (114 mg SO per L; 62.64%) and the removal of total dissolved solids (910 mg TDS per L, 12.08%) at an 840 mg TPH per L loading condition. The pH of the outlet wastewater prevailing in the mild alkaline range of 7.6 and 8.4, along with improved sulfate and TPH removal in the respective conditions suggested suitable conditions for sulfate-reducing bacteria (SRB). This study also signified the sustainability of the process for the effective treatment of hydrocarbon contaminated soil that also generates green energy.
pristine土壤环境支持健康的土壤生物多样性，但该环境常被难降解化合物污染。利用生物电化学系统（BESs）对污染土壤进行生物电化学修复，在土壤生态系统恢复方面正受到广泛关注。在此方向上，微生物燃料电池（MFC，BES的一种应用）被用于处理土壤微环境中三种污染程度（负载条件 - 每升320、590和840毫克总石油烃（TPHs））下的总石油烃。在每升158毫克TPH（对应320毫克TPH每升）和每升356毫克TPH（对应840毫克TPH每升）范围内，TPHs在土壤 - 电极附近有效降解。该研究还表明，在所研究的最高TPH负载浓度（每升840毫克TPH）下，最大生物电产生为286.7毫瓦每平方米（在100Ω时为448毫伏）。土壤MFC中的条件还促进了在每升840毫克TPH负载条件下去除硫酸盐（每升114毫克硫酸根；62.64%）和去除总溶解固体（每升910毫克TDS，12.08%）。出水废水的pH值在7.6至8.4的弱碱性范围内，以及在各自条件下硫酸盐和TPH去除率的提高，表明为硫酸盐还原菌（SRB）提供了适宜条件。该研究还表明了该工艺对有效处理烃类污染土壤并产生绿色能源的可持续性。
