Kamde Kalyani, Dahake Rashmi, Pandey R A, Bansiwal Amit
a Environmental Biotechnology Division CSIR-National Environmental Engineering Research Institute , Nagpur , Maharashtra , India.
b Environmental Material Division , CSIR-National Environmental Engineering Research Institute , Nagpur , Maharashtra , India.
Environ Technol. 2019 Apr;40(10):1337-1348. doi: 10.1080/09593330.2017.1422547. Epub 2018 Jan 8.
Recently, removal of arsenic from different industrial effluent discharged using simple, efficient and low-cost technique has been widely considered. In this study, removal of arsenic (As) from real wastewater has been studied employing modified bio-oxidation followed by adsorptive filtration method in a novel continuous flow through the reactor. This method includes biological oxidation of ferrous to ferric ions by immobilized Acidothiobacillus ferrooxidans bacteria on granulated activated carbon (GAC) in fixed bed bio-column reactor with the adsorptive filtration unit. Removal efficiency was optimized regarding the initial flow rate of media and ferrous ions concentration. Synthetic wastewater sample having different heavy metal ions such as Arsenic (As), Cobalt (Co), Chromium (Cr), Copper (Cu), Iron (Fe), Lead (Pb) and Manganese (Mn) were also used in the study. The structural and surface changes occurring after the treatment process were scrutinized using FT-IR and Scanning Electron Microscopy (SEM) analysis. The finding showed that not only arsenic can be removed considerably in the bioreactor system, but also removing efficiency was much more (<90%) for other heavy metals in real wastewater sample. The results from TCPL test confirms that solid spent media was non-hazardous and can be safely disposed of. This study verified that combination of bio-oxidation with adsorptive filtration method improves the removal efficiency of arsenic and other heavy metal ions in wastewater sample.
近年来，人们广泛考虑采用简单、高效且低成本的技术去除不同工业废水中排放的砷。在本研究中，采用改良生物氧化法，随后在一种新型连续流动通过式反应器中采用吸附过滤法，研究了从实际废水中去除砷（As）的情况。该方法包括在固定床生物柱反应器中，通过固定在颗粒活性炭（GAC）上的氧化亚铁硫杆菌将亚铁离子生物氧化为铁离子，并配备吸附过滤单元。针对介质的初始流速和亚铁离子浓度对去除效率进行了优化。研究中还使用了含有不同重金属离子（如砷（As）、钴（Co）、铬（Cr）、铜（Cu）、铁（Fe）、铅（Pb）和锰（Mn））的合成废水样本。使用傅里叶变换红外光谱（FT - IR）和扫描电子显微镜（SEM）分析仔细研究了处理过程后发生的结构和表面变化。研究结果表明，不仅在生物反应器系统中可以大量去除砷，而且对于实际废水样本中的其他重金属，去除效率也更高（<90%）。毒性特征浸出程序（TCLP）测试结果证实，固体废弃介质无害，可以安全处置。本研究证实，生物氧化与吸附过滤方法相结合可提高废水样本中砷和其他重金属离子的去除效率。
