蚯蚓对造纸污泥的养分和重金属处理效应研究

造纸污泥含有大量的养分和重金属等物质。试验采用室内培养试验,研究不同蚯蚓投放量对污泥中养分和重金属的处理效应。结果表明:蚯蚓的最佳投放量为中等投放量(22.5 g kg-1)。经过84天处理后,造纸污泥中有机质大量分解,最高分解率为24.95%;全量N、P、K的含量增加,其最大增量分别为2.65 g kg-1、0.64 g kg-1和0.32 g kg-1;碱解氮、速效磷、速效钾的最大减幅依次为24.78%、30.40%和10.77%。经蚯蚓处理后造纸污泥中重金属Mn、Cu和Zn的最大去除率依次为28.80%、28.80%和35.34%,蚯蚓体内Mn、Cu和Zn最高增加了8.03%、23.49%和27.06%,Mn、Cu和Zn的K值均小于1.0,其中Mn>Zn>Cu,说明蚯蚓对重金属Mn、Cu和Zn有明显的去除效应。

Effect of Earthworm Biological Treatment on Nutrients and Heavy Metals of Paper Mill Sludge

Paper mill sludge contains a lot of nutrients and heavy metals.We studied the change of nutrients and heavy metals after the earthworm treatment in paper mill sludge of different earthworms addition rates in the incubation experiments.The results showed that the appropriate addition rate was 22.5 gram earthworm per kilogram paper mill sludge.After 84 days of the earthworm treatment,the organic matter of the sludge decomposed strongly and the highest resolution ratio reached 24.95 %;total N,total P and total K increased,and their maximum increments were separately 2.65 g kg-1,0.65 g kg-1 and 0.32 g kg-1;the maximum decreases of available N,available P and available K were 24.78 %,30.40 % and 10.77 %,respectively.The maximum removal rates of total Mn,Cu and Zn reached 28.80%,28.80% and 35.34%,respectively,and the maximum increments of total Mn,Cu and Zn in earthworms were respectively 8.03 %,23.49 % and 27.06 %.The K-values of total Mn,Cu and Zn of earthworm were all lower than 1.0 and ordered as Mn> Zn> Cu,which suggested that the earthworm could significantly absorb Mn,Cu and Zn in paper mill sludge.