Abstract:In order to achieve the high efficient purification of freshwater aquaculture tail water, the purification efficiency of Takifugu obscurus aquaculture tail water by photosynthetic bacteria combined with one of three different life forms of aquatic plants Eichhornia crassipes, Ipomoea aquatica and Myriophyllum verticillatum was studied through laboratory water quality determination methods, the changes and removal effects of various parameters of water quality (TAN, $ {\rm{NO}}_{\rm{2}}^ - $-N, $ {\rm{NO}}_{\rm{3}}^ - $-N, TSS, COD, TN and TP) were analyzed. The results showed that Ipomoea aquatica grew fastest of three aquatic plants, Eichhornia crassipes followed, and Myriophyllum verticillatum grew slowest. The combined systems of photosynthetic bacteria and aquatic plants had a significant purification effect on the freshwater aquaculture tail water, the removal effects of $ {\rm{NO}}_{\rm{2}}^ - $-N, $ {\rm{NO}}_{\rm{3}}^ - $-N, TSS, TN and TP in tail water by the combined systems with aquatic plants(PA1, PA2, PA3) were better than those of photosynthetic bacteria group (P) and control group (P<0.05), but the removal effects of TAN and COD were not significant (P>0.05), but they were higher than those of control group. Among them, the removal effect of the combined system with Ipomoea aquatica (PA2) was the best, and the concentrations of $ {\rm{NO}}_{\rm{2}}^ - $-N, TN, TP and COD decreased rapidly within 6 days, the concentration of TAN decreased to the lowest value within 9 days, and gradually approached to the stable values. The final removal rates of TAN, $ {\rm{NO}}_{\rm{2}}^ - $-N, $ {\rm{NO}}_{\rm{3}}^ - $-N and TSS reached 94.34%, 99.7%, 99.11% and 97.23%, respectively, and the removal rates of TN, TP and COD reached 87.74%, 86.26% and 34.07%, respectively. All the indicators, except for TSS, could meet the first-level discharge standards in the Discharge Requirements for Tail Water of Freshwater Aquaculture (SC/T 9101-2018) required by the Ministry of Agriculture and Rural Areas of China. Therefore, the best combination was photosynthetic bacteria and Ipomoea aquatica. The research results can provide a reference for the design and construction of freshwater aquaculture tail water treatment system. Key words:Photosynthetic bacteria/ aquatic plants/ aquaculture tail water/ removal rate/ purification efficiency.
图2各组中总氨氮(TAN)、亚硝态氮($ {\rm{NO}}_{\rm{2}}^ - $-N)和硝态氮($ {\rm{NO}}_{\rm{3}}^ - $-N)浓度的变化 Figure2.Variation of concentrations of total ammonia nitrogen, nitrite nitrogen and nitrate nitrogen in each group
下载: 导出CSV 表2表2实验结束后各组中总氨氮(TAN)、亚硝态氮($ {\bf{NO}}_{\rm{2}}^ - $-N)和硝态氮($ {\bf{NO}}_{\rm{3}}^ - $-N)的浓度及其去除率 Table2.At the end of the experiment, the concentration and removal rate of total ammonia nitrogen, nitrite nitrogen and nitrate nitrogen in each group
下载: 导出CSV 表3实验结束后各组中化学需氧量(COD)和总固体悬浮物(TSS)的浓度及其去除率 Table3.At the end of the experiment, the concentration and removal rate of chemical oxygen demand and total solid suspension in each group
下载: 导出CSV 表4实验结束后各组中总氮和总磷浓度及其去除率 Table4.At the end of the experiment, the concentration and removal rate of total nitrogen and total phosphorus in each group
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Shanghai Fisheries Research Institute, Shanghai Fisheries Technical Extension Station, Shanghai 200433, China Received Date: 2020-09-21 Accepted Date: 2021-02-19 Available Online: 2021-04-23 Keywords:Photosynthetic bacteria/ aquatic plants/ aquaculture tail water/ removal rate/ purification efficiency Abstract:In order to achieve the high efficient purification of freshwater aquaculture tail water, the purification efficiency of Takifugu obscurus aquaculture tail water by photosynthetic bacteria combined with one of three different life forms of aquatic plants Eichhornia crassipes, Ipomoea aquatica and Myriophyllum verticillatum was studied through laboratory water quality determination methods, the changes and removal effects of various parameters of water quality (TAN, $ {\rm{NO}}_{\rm{2}}^ - $-N, $ {\rm{NO}}_{\rm{3}}^ - $-N, TSS, COD, TN and TP) were analyzed. The results showed that Ipomoea aquatica grew fastest of three aquatic plants, Eichhornia crassipes followed, and Myriophyllum verticillatum grew slowest. The combined systems of photosynthetic bacteria and aquatic plants had a significant purification effect on the freshwater aquaculture tail water, the removal effects of $ {\rm{NO}}_{\rm{2}}^ - $-N, $ {\rm{NO}}_{\rm{3}}^ - $-N, TSS, TN and TP in tail water by the combined systems with aquatic plants(PA1, PA2, PA3) were better than those of photosynthetic bacteria group (P) and control group (P<0.05), but the removal effects of TAN and COD were not significant (P>0.05), but they were higher than those of control group. Among them, the removal effect of the combined system with Ipomoea aquatica (PA2) was the best, and the concentrations of $ {\rm{NO}}_{\rm{2}}^ - $-N, TN, TP and COD decreased rapidly within 6 days, the concentration of TAN decreased to the lowest value within 9 days, and gradually approached to the stable values. The final removal rates of TAN, $ {\rm{NO}}_{\rm{2}}^ - $-N, $ {\rm{NO}}_{\rm{3}}^ - $-N and TSS reached 94.34%, 99.7%, 99.11% and 97.23%, respectively, and the removal rates of TN, TP and COD reached 87.74%, 86.26% and 34.07%, respectively. All the indicators, except for TSS, could meet the first-level discharge standards in the Discharge Requirements for Tail Water of Freshwater Aquaculture (SC/T 9101-2018) required by the Ministry of Agriculture and Rural Areas of China. Therefore, the best combination was photosynthetic bacteria and Ipomoea aquatica. The research results can provide a reference for the design and construction of freshwater aquaculture tail water treatment system.
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