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| Microbial functional enzyme activities in water purification material in the precipitation treatment area of aquaculture wastewater systems |
| Received:May 08, 2020 |
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| KeyWord:aquaculture wastewater treatment;volcanic stone;modified attapulgite;nitrogen conversion;phosphorus decomposition |
| Author Name | Affiliation | E-mail | | YANG Xiao-xi | Wuxi Fishery College, Nanjing Agricultural University, Wuxi 214081, China | | | WU Wei | Wuxi Fishery College, Nanjing Agricultural University, Wuxi 214081, China | | | SHI Yu-lu | Wuxi Fishery College, Nanjing Agricultural University, Wuxi 214081, China | | | WANG Yu-qin | Wuxi Fishery College, Nanjing Agricultural University, Wuxi 214081, China | | | QIAN Xin-yu | Wuxi Fishery College, Nanjing Agricultural University, Wuxi 214081, China | | | ZHENG Yao | Wuxi Fishery College, Nanjing Agricultural University, Wuxi 214081, China
Freshwater Fisheries Research Center, Chinese Academy of Fishery Sciences, Wuxi 214081, China | zhengy@ffrc.cn | | CHEN Jia-zhang | Wuxi Fishery College, Nanjing Agricultural University, Wuxi 214081, China
Freshwater Fisheries Research Center, Chinese Academy of Fishery Sciences, Wuxi 214081, China | chenjz@ffrc.cn |
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| Abstract: |
| To study the mechanism underlying water purification with specific materials in the precipitation treatment area of wastewater treatment systems, the enzyme activities, water quality indicators, and the major categories of bacteria and fungi in the surrounding water bodies and in the two purification materials, nitrogen-modified attapulgite(Al@TCAP-N)and volcanic rocks, were evaluated. The enzyme activities were related to the nitrogen and phosphorus contents, as well as to the decomposition of organic matter. The results showed that Al@TCAP-N and volcanic stone increased the microbial alkaline phosphatase(AKP) and nitrate reductase(Nar) activities in the surrounding water. Volcanic stone promoted the activities of internal organophosphorus hydrolase(OPH)and ammonia monooxygenase (AMO)during the early stages of treatment(0~6 h). Al@TCAP-N increased the internal dehydrogenase(DHO)activity in the later period (36~48 h). The enzymatic activities of microorganisms in volcanic stone were higher than of those in Al@TCAP-N. The optimal time for water treatment was 36 h, and the removal rates of total nitrogen(TN), total phosphorus(TP), and permanganate were 22.61%, 9.52%, 22.16%, respectively. In the actual application process, the levels of harmful pollutants in the water could be reduced by the dual effects of adsorption by Al@TCAP-N and the action of microorganisms present in volcanic rocks. Planctomycetes, Protepbacteria, Bacteroidetes, and Chytridiomycota were the major bacterial and fungal phyla present in the purification materials. Treatment with the Al@TCAP-N and volcanic rock promoted the decomposition of phosphorus compounds and the conversion of nitrogen in water. Volcanic stone promoted the decomposition of organic phosphorus compounds and the conversion of nitrate nitrogen(NO3--N)to nitrous nitrogen(NO2--N)during the early stages of purification. Al@TCAP-N promoted the decomposition of organic matter during the later stages of purification. |
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