蚯蚓堆制技术处理水葫芦过程中的重金属生物放大作用  

Biomagnification of Heavy Metals during Vemicomposting of Water Hyacinth by Earthworm

作　　者：周娟娟[1] 李战军[2] 

机构地区：[1]福建师范大学闽南科技学院,福建泉州362332 [2]中国科学院城市环境研究所,福建厦门361021

出　　处：《环境科技》2012年第3期5-7,共3页Environmental Science and Technology

基　　金：福建省教育厅项目:水葫芦养殖蚯蚓工艺的研究(JB09080)

摘　　要：水葫芦对重金属有较强的生物富集作用。在利用蚯蚓堆制技术处理水葫芦时,蚯蚓可通过生物放大作用进一步累积重金属。为了研究蚯蚓堆制技术处理水葫芦过程中,蚯蚓对重金属的富集规律,测定了模拟废水中生长的水葫芦茎叶部和根部的Cd(Ⅱ),Cr(Ⅵ),Pb(Ⅱ),Cu(Ⅱ),Ni(Ⅱ)含量,研究了蚯蚓堆制处理水葫芦茎叶过程中蚯蚓蚓体和蚓粪中的重金属含量。研究结果表明,水葫芦虽然可富集重金属,但主要集中在根部,茎叶部含量较少,以茎叶部饲养蚯蚓是较为安全的。当以茎叶部饲养蚯蚓时,受重金属污染的水葫芦可导致蚯蚓生长速率下降。但蚯蚓对重金属有一定耐受力,蚓粪中重金属含量远大于蚯蚓蚓体中的含量。Heavy metals could be bio-concentrated by water hyacinth and might be further cumulated by earthworm via the bio-magnification effect during vemicomposting. In order to realize the biomagnification of heavy metals, the concentrations of Cd（II）, Cr（VI）, Pb（II）, Cu（II）,Ni（II） in the leaves and root of water hyacinth cultured in simulated wastewater, earthworms, and wormdung were tested. The results indicated that heavy metals could be bio-concentrated by water hyacinth and the growth rate of earthworms was decreased when the heavy meatals concentrations increased. Nevertheless, most of the heavy metals were distributed in the root. So it was relatively safe to feed earthworms with the leaves. Moreover, earthworms were somewhat patient towards low levels of heavy metals while most of the heavy metals were retained in their dung.

关 键 词：水葫芦 蚯蚓 重金属 生物放大 

分 类 号：X7[环境科学与工程—环境工程]