重金属絮凝剂二硫代羧基化壳聚糖对废水中铅锌的去除性能

Removal of Lead and Zinc Ions in Waste Water with Heavy Metal Flocculant Dithiocarboxyl Chitosan

以二硫代羧基化壳聚糖(DTCTS)为重金属絮凝剂,研究了该絮凝剂对废水中铅锌的去除性能,并对一些影响因素进行了考查.研究结果表明:DTCTS对Pb^(2+)、Zn^(2+)的捕集效率较高,去除率均可达95%以上;pH值对DTCTS去除Pb^(2+)、Zn^(2+)有一定的影响,当pH=6时,DTCTS对Pb^(2+)、Zn^(2+)去除效果最好;EDTA对Pb^(2+)、Zn^(2+)的去除有抑制作用;柠檬酸和氨基乙酸对Pb^(2+)的去除有一定的抑制,而对Zn^(2+)的去除影响甚微;焦磷酸钠及致浊物质的存在均能促进Pb^(2+)、Zn^(2+)的去除.

The removal effect of the flocculant on Pb 2+and Zn 2+in waste water was investigated by using dithiocarboxyl chitosan(DTCTS)as the heavy metal flocculant,and the effects of some influencing factors were examined through a series of experiments.Results show that DTCTS exhibits strong collection efficiency for Pb 2+and Zn 2+,and the removal rates of Pb 2+and Zn 2+are higher than 95%.PH value has certain influence on removal effects of DTCTS on Pb 2+and Zn 2+.When pH value is 6.0,the best effect for the removal of Pb 2+and Zn 2+can be achieved.EDTA has a restraining effect on the removal of Pb 2+and Zn 2+.Citric acid and amino acetic acid can restrain the removal of Pb 2+,but have no effect on the removal of Zn 2+.Sodium pyrophosphate and turbidity can promote the removal rates of Pb 2+and Zn 2+.