水产养殖废水循环利用及多余藻类生物量资源化

Recycling of Aquaculture Wastewater and Reusing the Resources of Redundant Algae Biomass

论文采用多个池塘循环养殖生态系统,利用"藻类-螺类-鲈鱼-微生物"营养链关系对养殖废水中多余有机质、营养盐的去除,研究了养殖废水净化、循环利用及水体多余藻类生物量资源化。结果表明,在系统运行的各个时期TN、NO3--N、NO2--N的平均去除率都超过80%,对总氨(NH4++NH3)去除率达97.17%,效果最好;TP的去除率达94.17%,CODcr的去除率为71.87%。出水口TN、TP、叶绿素平均值均达到湖泊Ш类水标准;CODcr达到了Ⅰ类水质标准。NO3--N、NO2--N、总氨(NH4++NH3)、溶解氧含量都符合渔业水质标准要求。该系统处理能力的稳定性较高,可以调控藻类种群结构、充分利用水体藻类和营养物质、将其转化为螺贝类或者价格更高的鲈鱼等增加养殖效益,还可以节约水资源,减少养殖废水排放量。

This paper studies aquaculture wastewater purification, recycling and reusing the resource of redundant algae biomass of aquaculture wastewater, from which recirculating aquaculture ecosystem was adopted for several ponds, in brief, through Algae-Snails-Weever-Microbial chain to remove the surplus nutrient and organic material of aquaculture wastewater. Result showed that the average removal rate of TN, NO3 - N and NO2- - N was more than 80%, and the removal rate of total ammonia（NH4 ＋ NH3）was the highest, up to 97. 17%; the removal rate of TP and CODcr was 94. 17% and 71.87%, respectively. The mean content of outlet＇s TN and TP and chlorophyll reached Category Ⅲ lake water standard, COD value reached Type I water level, nitrogen and dissolved oxygen contents were in accordance with the requirement of the fishing industry water quality standards. The ability of the high stability of the system can control algae population structure, and make full use of water algae biomass and nutrients, so energy will be transla- ted into higher prices or shellfish and weever to increase aquaculture efficiency, hence this system can not only save water resources but also decrease the discharge of wastewater.