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Article

Study on Water Purification Effect and Operation Parameters of Various Units of Wastewater Circulation

1
Wuxi Fishery College, Nanjing Agricultural University, Wuxi 214081, China
2
Key Laboratory of Integrated Rice-Fish Farming Ecology, Ministry of Agriculture and Rural Affairs, Freshwater Fisheries Research Center (FFRC), Chinese Academy of Fishery Sciences (CAFS), Wuxi 214081, China
3
Key Laboratory of Healthy Freshwater Aquaculture, Ministry of Agriculture and Rural Affairs, Key Laboratory of Fish Health and Nutrition of Zhejiang Province, Zhejiang Institute of Freshwater Fisheries, Huzhou 313001, China
*
Authors to whom correspondence should be addressed.
These authors contributed equally to this work.
Academic Editors: Francisco Osorio, Christos S. Akratos, Laura Bulgariu, Xuwang Zhang and Jongkwon Im
Water 2022, 14(11), 1743; https://doi.org/10.3390/w14111743
Received: 15 April 2022 / Revised: 21 May 2022 / Accepted: 26 May 2022 / Published: 29 May 2022
The discharge of wastewater from aquaculture ponds causes a certain degree of damage to the environment. It is necessary to continuously improve the treatment efficiency of wastewater treatment devices. The purpose of this study is to obtain an optimal ratio of wastewater circulation devices in order to obtain the best operating parameters and to reduce the discharge of polluted water. We constructed an experimental wastewater circulation device consisting of three units. The primary unit contained modified attapulgite ([email protected]AP-N), volcanic stone, and activated carbon for precipitation. The secondary and tertiary units used biological methods to enhance removal rates of nitrogen and phosphorus. Water quality indicators of total phosphorus (TP), total nitrogen (TN), ammonia (NH3-N), permanganate (CODMn), and total suspended solids (TSS) were detected. Water quality was tested under different matching ratios for three units of different hydraulic retention time (HRT) and load Results showed that the removal rate of TP, TN, NH3-N, and TSS reached 20–60%, 20%, 30–70%, and 10–80%, respectively. The average reduction efficiencies of secondary module chlorella and filler on TP, TN, NH3-N, CODMn, and TSS were 56.88%, 30.09%, 0.43%, 46.15%, and 53.70%, respectively. The best removal rate can be achieved when the matching ratio of each unit becomes 2:1:1 and the hydraulic retention time is maintained within 2 h in the high-concentration load. Finally, the average removal rates of TP, TN, NH3-N, and TSS reached 58.87%, 15.96%, 33.99%, and 28.89%, respectively. The second unit obtained the enhanced removal effect in this wastewater treatment system when adding microorganisms and activated sludge. View Full-Text
Keywords: wastewater; modified attapulgite; volcanic stone; hydraulic retention time; removal rate wastewater; modified attapulgite; volcanic stone; hydraulic retention time; removal rate
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MDPI and ACS Style

Yin, T.; Zheng, Y.; Liu, T.; Wang, X.; Gao, J.; Nie, Z.; Song, L.; Xu, G.; Yuan, J. Study on Water Purification Effect and Operation Parameters of Various Units of Wastewater Circulation. Water 2022, 14, 1743. https://doi.org/10.3390/w14111743

AMA Style

Yin T, Zheng Y, Liu T, Wang X, Gao J, Nie Z, Song L, Xu G, Yuan J. Study on Water Purification Effect and Operation Parameters of Various Units of Wastewater Circulation. Water. 2022; 14(11):1743. https://doi.org/10.3390/w14111743

Chicago/Turabian Style

Yin, Tongtong, Yao Zheng, Tingyan Liu, Xiaofei Wang, Jiancao Gao, Zhijuan Nie, Lili Song, Gangchun Xu, and Julin Yuan. 2022. "Study on Water Purification Effect and Operation Parameters of Various Units of Wastewater Circulation" Water 14, no. 11: 1743. https://doi.org/10.3390/w14111743

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