人工湿地对胡子鲇养殖水体循环净化的研究

摘要

以大型观光植物美人蕉-砾石为基础的垂直流人工湿地对胡子鲇养殖水体进行净化处理和回流使用,在胡子鲇养殖中测定了水体主要水质指标的变化,表明人工湿地对养殖水体净化效果显著,养殖期间BOD5、COD、TN的平均去除率分别为81.77%、55.55%和65%,净化后水质部分符合渔业用水标准,可以循环利用.对照池水体由于BOD5、COD、TN得不到去除而持续增加,混浊度显著高于实验池,并出现水华.这种水体循环养殖模式具结构简单和易推广等优点.%The vertical-flow constructed wetland which was in the base of gravel-Canna indica was designed and applied to purify wastewaters for reusing in the culture of Clarias fuscus.Observations were taken on parameters of water quality during breeding Clarias fuscus.The results showed that the planted constructed wetland had considerably effective purification in water body of aquaculture.The average removal rate of BOD5,COD,and TN of wastewaters during breeding periods was 81.77%,55.55%,and 65% respectively.After being purified,the water quality partly accorded with the National Standard of Fishery Water Quality,and the culture water could be recycled.However,because there was no treatment in the control pond,BOD5,COD and TN increased continually.The turbidity degree was obviously higher than that in the experimental pond.Algae bloomed in the control pond.This study demonstrated the advantage for planted constructed wetlands which were simple mechanisms and easily generalized to treatment of wastewaters in circulating aquaculture.