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Retention of 2,4,6-trinitrotoluene and heavy metals from industrial waste water by using the low cost adsorbent pine bark in a batch experiment

机译:批量实验中使用低成本吸附松树皮保留工业废水中的2,4,6-三硝基甲苯和重金属

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摘要

Pine bark is a low cost sorbent originating from the forest industry. In recent years, it has been found to show promise as an adsorbent for metals and organic substances in contaminated water, especially landfill leachates and storm water. This study aims to investigate if pine bark can replace commercial adsorbents such as active carbon. An industrial effluent, collected from a treatment plant of a demilitarization factory, was diluted to form concentration ranges of contaminants and shaken with pine bark for 24 hours. Metals (e.g. Pb, Zn, Cd, As and Ni) and explosives, e. g., 2,4,6-trinitrotoluene (TNT), were analysed before and after treatment. The aim of the experiment was twofold; firstly, it was to investigate whether metals are efficiently removed in the presence of explosives and secondly, if adsorption of explosive substances to pine bark was possible. Langmuir and Freundlich isotherms were used to describe the adsorption process where this was possible. It was found that metal uptake was possible in the presence of TNT and other explosive contaminants. The uptake of TNT was satisfactory with up to 80% of the TNT adsorbed by pine bark.
机译:松树皮是源自林业的低成本吸附剂。近年来,发现它被证明是吸附污水中金属和有机物特别是垃圾渗滤液和雨水的一种吸附剂。这项研究旨在调查松树皮是否可以代替商业吸附剂,例如活性炭。从非军事化工厂的处理厂收集的工业废水经过稀释以形成污染物的浓度范围,并用松树皮振荡24小时。金属(例如Pb,Zn,Cd,As和Ni)和炸药,例如在处理之前和之后分析例如2,4,6-三硝基甲苯(TNT)。实验的目的是双重的。首先,要研究在炸药存在下是否能有效地去除金属;其次,是否有可能将爆炸性物质吸附到松树皮上。 Langmuir和Freundlich等温线用于描述可能的吸附过程。发现在TNT和其他爆炸性污染物的存在下可能吸收金属。 TNT的吸收令人满意,松树皮吸收的TNT高达80%。

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