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首页> 外文会议>XXI International Mineral Processing Congress >DECONTAMINATION OF CADMIUM FROM INDUSTRIAL LIQUID WASTE BY COCONUT FIBER
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DECONTAMINATION OF CADMIUM FROM INDUSTRIAL LIQUID WASTE BY COCONUT FIBER

机译：椰子纤维对工业废液中的镉进行去污染

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摘要

Cadmium, a common contaminant in aqueous effluents originating from electrowinning and nickel/cadmium battery plants, is of great concern because of its cumulative effect on the human organism. The decontamination of aqueous solutions containing cadmium ions using a scavenger the fiber of Cocus nucifera was investigated in laboratory scale. Chemical precipitation by alkalies to concentrate the metal in sludge is not effective for cadmium ion removal, due to its hydroxide and carbonate high K_(PS) values. Recently used and effective are the electrolytic and the adsorptive methods by vegetable waste. In Brazil, especially in the coastal areas, a considerable tonnage of bulky waste from coconut extensively accumulates and decays. The mesocarp of the coconuts is, usually, a fibrous pulp, and the fiber surface of the Cocus nucifera is rich in chemical compounds which are good scavengers for cadmium ions; hydrosoluble compounds, which also present, may interfere, probably as ligands which may retain the Cd~(2+) in solution. The authors have obtained high efficiencies for the removal of Cd~(2+) with fibers in natura, from this vegetable waste. In previous papers conditions established for the optimization of the adsorptive separation (pH adjustment, ratio of fiber/solution volume, contact time, etc.) were described. The process has lead Cd~(2+) removal efficiency more than 99%, thus adequating the final effluent to the legal limits established by FEEMA-Rio de Janeiro's pollution control agency. In the present paper, fundamentals are described and the active chemical compounds on the coconut fiber surface, responsible for retention of Cd~(2+), are characterized by IR and NMR analyses. This innovative process may have economical value, since cadmium may be recovered in commercial form.
机译：镉是电解沉积和镍/镉电池厂中废水中的常见污染物，由于其对人体的累积影响，因此备受关注。在实验室规模上研究了使用清除剂Cocus nucifera纤维对含镉离子的水溶液进行的去污。由于碱金属的氢氧化物和碳酸盐的K_（PS）值较高，因此用碱进行化学沉淀以将金属浓缩到污泥中对于去除镉离子无效。最近使用和有效的是利用植物废料的电解和吸附方法。在巴西，特别是在沿海地区，大量吨的椰子废料大量积累和腐烂。椰子的中果皮通常是一种纤维状的果肉，而Cocus nucifera的纤维表面富含化学化合物，这些化合物是镉离子的良好清除剂。还存在的水溶性化合物可能会作为配体发生干扰，从而可能将Cd〜（2+）保留在溶液中。作者已经获得了从这种蔬菜废料中去除天然纤维中Cd〜（2+）的高效方法。在先前的论文中，描述了为优化吸附分离而建立的条件（pH调节，纤维/溶液体积比，接触时间等）。该方法的铅Cd〜（2+）去除效率超过99％，因此使最终废水达到FEEMA-Rio de Janeiro污染控制机构规定的法定限值。本文描述了基本原理，并通过IR和NMR分析表征了椰子纤维表面上负责保留Cd〜（2+）的活性化合物。这种创新工艺可能具有经济价值，因为镉可能以商业形式回收。

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