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| Selection of the purification material and its operating parameters for primary precipitation units |
| Received:March 13, 2020 |
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| KeyWord:aquaculture wastewater;primary precipitation unit;water purification materials;volcanic stone;modified 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: |
| In order to optimize the purification capacity of the primary precipitation unit of aquaculture wastewater treatment systems, the efficiency of seven purification materials based on three water quality indices, their optimal values, and their distribution was assessed. The three water quality indices included total nitrogen (TN), total phosphorus (TP), and the permanganate index (CODMn). The seven purification materials included phosphorus and nitrogen removal-type Al-impregnated thermally treated calcium-rich attapulgites (Al@TCAP-P and Al@TCAP-N, respectively), ceramsite sand, bacterial house, volcanic stone, ammonia absorption stone, and activated carbon. The results showed that Al@TCAP-N and volcanic stone exhibited overall suitable removal rates TN, TP, and CODMn. Under normal precipitation, the efficiency of Al@TCAP-N to remove TN was 36%, with tiling as the best treatment type. The efficiencies of volcanic stone to remove TP and reduce CODMn were 34% and 15%, respectively, with accumulation as the best treatment type. The additive amounts of Al@TCAP-N and volcanic stone were 5.24 g·L-1 and 5.02 g·L-1, respectively, when they were used in the primary precipitation unit to improve purification efficiency. |
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