农业有机废弃物对废水中Cr^(6+)吸附效果的研究

Research on the Adsorption Removal of Heavy Metal Pollutants Cr^(6+) by Agricultural Organic Wastes

针对电镀、皮革等工业造成的重金属Cr6+污染,而大量农业有机废弃物(如秸秆等)没有得到充分利用的严峻现实,研究了生物质种类、改性等条件对Cr6+吸附效果的影响。结果表明,不同生物质的吸附效果为:花生壳>玉米芯>麦壳>玉米秆;活化后生物质吸附Cr6+的能力显著提高,其中麦壳的活化效果最好,Cr6+脱除率可增加10%;随着Cr6+废水溶液pH值的升高,生物质对Cr6+的吸附率降低。废水溶液中Cr6+浓度对吸附率具有明显的影响,当浓度为30μg/mL时Cr6+吸附率达74%以上。

With electroplating, leather and other industrial development, the environment was polluted by heavy metal pollutants Cr6＋ , badly. At the same time, the agricultural organic waste wasn＇t used adequately. The effect of biomass type （ as peanut shells, corncob, wheat shell and cornstalk） and modification on the Cr6＋ adsorption removal was researched in this paper. The results indicated that different biomass have a difference Cr6＋ removal ability, and the peanut shells is the best adsorbent for Cr6＋ removal in the used biomasses. Modification could improve the ability of removal Cr6＋ for all used biomass, and the removal ability of Cr6＋ could be obviously affected by modification for wheat shell, and the removal rate of Cr6＋ could be increased 10 %. The removal rate of Cr6＋ decreased with pH value of waste water solution increment. With the concentration of Cr6＋ in waste water solution changing, the removal rate exceeded 74 % at 30 μg/mL.