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| Influence of volcanic stone and Al@TCAP-N on the purification effect of primary precipitation units |
| Received:April 01, 2020 |
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| KeyWord:aquaculture wastewater treatment;primary precipitation units;volcanic stone;Al-impregnated thermally treated calcium-rich attapulgite |
| Author Name | Affiliation | E-mail | | WANG Yu-qin | 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 | | QIAN Xin-yu | Wuxi Fishery College, Nanjing Agricultural University, Wuxi 214081, China | | | YANG Xiao-xi | Wuxi Fishery College, Nanjing Agricultural University, Wuxi 214081, China | | | CHEN Jia-zhang | Wuxi Fishery College, Nanjing Agricultural University, Wuxi 214081, China
Freshwater Fisheries Research Center, Chinese Academy of Fishery Sciences, Wuxi 214081, China | | | WU Wei | Wuxi Fishery College, Nanjing Agricultural University, Wuxi 214081, China
Freshwater Fisheries Research Center, Chinese Academy of Fishery Sciences, Wuxi 214081, China | wuw@ffrc.cn |
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| Abstract: |
| To optimize the purification capacity in the primary precipitation unit of an aquaculture wastewater treatment system, nitrogen removal type Al-impregnated thermally-treated calcium-rich attapulgite(Al@TCAP-N)and volcanic stone were used in this study. Moreover, a microscope was used to study the purification mechanism and measure the specific surface area. The concentration and removal rates of TN, TP, and CODMn were regarded as detection indicators. A method of using two purification materials to enhance water purification in the primary precipitation unit was discovered, and the corresponding operating parameters and the ability to reuse were obtained. Results showed that the specific surface area of Al@TCAP-N was large(28.58 m2·g-1), rendering the attachment of microorganisms difficult. The specific surface area of volcanic stone was small(10.9 m2·g-1)but suitable for microorganism attachment. The treatment effect of the primary precipitation unit on cultured wastewater was significantly improved and its removal rates of TN, TP, and CODMn were 41.25%, 45.31%, and 54.97%, respectively, possibly due to the combined effect of composite purification materials and exogenous microorganisms. The results of the in-depth study on operating parameters of the model showed that the most suitable compounding mass ratio for the two materials was 1:1 and the most suitable addition amount when compounding was 1 g·L-1. Moreover, the purification effect of the microorganisms that are directly added to the water body is higher than that of the solid support. Investigation of used purification materials indicated that they can be reused by simply washing and drying. The used purification materials can potentially be re-utilized because they contain 201.73 μg nitrogen and 34.98 μg phosphorus per gram. The combination of purification materials and exogenous microorganisms can effectively increase the water purification effect of the primary precipitation unit. |
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