水丝蚓对猪粪重金属的富集作用及周边水质影响研究
Investigation of Limnodilus hoffineisteri on Heavy Metals Enrichment in Pig Manure and Water Quality

水丝蚓中重金属的含量会影响特种水生动物的生长和品质，是水丝蚓资源化利用的主要制约因素。本文研究了利用新鲜猪粪培育水丝蚓的过程中水丝蚓对猪粪重金属的富集作用及周边稻田水质的影响。结果表明：水丝蚓可以显著降低猪粪中Cu、Zn的含量，Cu在水丝蚓干的含量仅有猪粪含量的2%左右，而Zn在水丝蚓干的含量降低至猪粪含量的14%左右，但对猪粪中的Pb、Cr、As发生了一定的富集作用。水质结果表明，水丝蚓处理后的水体Cd、Cr、Hg、As的平均含量均低于0.001 mg/L，铜、铅和锌的含量约为0.02 mg/L，去除效果差异显著。稻田种植区及稻渔共作区可以有效利用水丝蚓培育区出水的氨态氮和硝态氮，增加水体的溶解氧，同时，总氮和总磷经过稻渔共作区后，其含量也明显降低。
Heavy metal contents in Limnodilus hoffineisteri will affect the growth and quality of special aquatic animals, which was the main restriction factor for utilization. This study investigated the Limnodilus hoffineisteri on heavy metals enrichment in pig manure and rice and fish farming water quality and the results indicated that Limnodilus hoffineisteri can significantly reduce the content of copper and zinc in pig manure, with the copper content in the dried hymeniaceae only about 2% of that in pig feces, zinc reduced to about 14% in pig feces, while it has certain enrichment effects on Pb, Cr and As. The average content of Cd, Cr, Hg and As in the water body after Limnodilus hoffineisteri treatment was < 0.001 mg/L, and the content of copper, lead, and zinc is about 0.02 mg/L. The paddy field and rice-fish farming area can effectively utilize ammonia nitrogen and nitrate nitrogen from the effluent of Limnodilus hoffineisteri cultivation area, increase dissolved oxygen content in the water body, meanwhile, the content of nitrogen and phosphorus nutrients were also significantly reduced through the rice-fish farming area.