循环养殖系统中多级生物处理对水质的调控作用

研究了根据不同生物的功能特性及其间的协同作用,建立的由芦苇湿地、沉水植被群落、人工基质固定化微生物膜、软体底栖动物和滤食性鱼类组成的自净型多级生物修复系统,对养殖塘环境改善情况。结果显示:与实施修复前的系统相比,营养盐NO2-N、NO3-N和PO4-P的去除率分别达87.46%、62.99%和75.74%;浮游动、植物的生物量分别减少92.83%和15.90%。养殖塘排水营养盐NO2-N、NO3-N和PO4-P的去除率分别为27%～96%(年均87%)、37%～84%(年均84%)和30%～17%(年均9%),CODMn的去除率为1%～17%(年均9%)。经系统多级处理后水体透明度分别提高了75%和17%,最高值达52 cm。浮游植物生物量平均减少63.93%,尤其是蓝藻,平均减少68.17%。浮游植物群落结构转好,硅藻大量繁殖,成为优势种。浮游动物群落结构也由小型原生动物占优向大型枝角类、轮虫转变。受控于滤食性鱼类,浮游动物生物量维持在较低水平。

Controlling effect of multiple bio-treatments on water quality in a recirculating aquaculture system

According to the different functions of various living organisms and their synergistic effects,a self-purification multiple bio-treatment system was established.The system consisted of Phragmites australis beds,submerged plant communities,artificial immobilized microbial membranes,benthic molluscs and filter-feeding fish,utilized the nutrients in the water body,and finally improved the environment of the culure ponds.After comparing the system between pre-and post-treatment,the removal rates of NO2-N,NO3-N ...