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循环水养殖系统六级生物滤池运行效果分析
柳婷婷, 李丽, 蒋雯雯, 蔡玉勇, 董双林
0
(海水养殖教育部重点实验室中国海洋大学)
摘要:
本研究对硬头鳟(Oncorhynchus mykiss)和虹鳟(O. mykiss)鱼苗循环水养殖系统生物滤池运行效率以及其不同部位主要功能进行比较。于2017年5~11月,测定了六级生物滤池的基本水质指标(TAN、NO2--N和NO3--N等),并计算了六级生物滤池对TAN、NO2--N和NO3--N的去除效率。于养殖中期,测定了六级生物滤池不同部位(BF1~BF6)的硝化速率、亚硝氮氧化速率和反硝化速率。结果如下:六级生物滤池对TAN、NO2--N和NO3--N的平均去除率分别为75.00 %、44.00 %和17.70 %,其主要去除效果发生在BF1~BF3;六级生物滤池中BF1的硝化速率最高,与BF1较高的初始TAN浓度、充足的溶氧和最适pH有关;BF3的亚硝氮氧化速率最高,与BF3较高的初始NO2--N浓度有关;BF5的反硝化速率最高,与BF5较低的pH和较高NO3--N浓度有关。结果表明适当缩减生物滤池级数,并在循环水养殖系统中加入反硝化反应器,有利于提高系统运行效率。
关键词:  硬头鳟、虹鳟  循环水养殖系统  六级生物滤池  去除率  硝化作用
DOI:
投稿时间:2018-08-30修订日期:2019-04-01
基金项目:国家重点研发计划(2017YFE0122100);海水养殖教育部重点实验室开放(KLM2017002)资助,
Performance evaluation of a six-stage bio-filter in recirculating aquaculture system
Liu Tingting, Li Li, Jiang Wenwen, Cai Yuyong, Dong Shuanglin
(The Key Laboratory of Mariculture,Ministry of Education,Ocean University of China)
Abstract:
This study evaluated the performance and function of a six-stage bio-filter in the recirculating aquaculture systems culturing Oncorhynchus mykiss and O. mykiss. From May to November of 2017, water was sampled every month to measure the water quality parameters (TAN, NO2--N and NO3--N, etc.)and the removal efficiencies of TAN, NO2--N and NO3--N of the six-stage bio-filter were calculated. During the mid-period of culture, the nitrification rate, nitrite nitrogen oxidation rate, and denitrification rate in different positions of the six-stage bio-filter (BF1~BF6) were measured. The experimental results were as follows: the average removal rates of the bio-filter were 75.00 %, 44.00 % and 17.70 % for TAN, NO2--N and NO3--N, respectively; its main removal effect occurs in BF1~BF3; the nitrification rate of BF1 was the highest which was associated with the high TAN, DO and pH of BF1. The nitrite nitrogen oxidation rate of BF3 was the highest, which was related to the higher initial NO2--N concentration of BF3. The denitrification rate of BF5 was significantly highest, it was related to the lower pH and high NO3--N concentrations of BF5. These results indicate that properly reducing the number of bio-filter stages and adding a denitrification reactor will help improve system operation efficiency.
Key words:  rainbow trout  recirculating aquaculture system  six-stage bio-filter  nitrification