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Chinese Agricultural Science Bulletin ›› 2023, Vol. 39 ›› Issue (26): 154-164.doi: 10.11924/j.issn.1000-6850.casb2022-0803

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Purification Effect and Water Quality Evaluation of Tail Water after Standardized Transformation of Different Ponds

LIU Tingyan1(), WANG Xiaofei1, AN Shuwei2, GU Lingling2, XU Jing3, ZHENG Yao1,4(), XU Gangchun1,4   

  1. 1 Wuxi Fishery College of Nanjing Agricultural University, Wuxi, Jiangsu 214081
    2 Wujiang District Aquatic Technology Promotion Station of Suzhou, Suzhou, Jiangsu 215200
    3 Wuxi Environmental Monitoring Center, Wuxi, Jiangsu 214028
    4 Freshwater Fisheries Research Center, Chinese Academy of Fishery Sciences/ Key Laboratory of Integrated Rice-Fish Farming Ecology, Ministry of Agriculture and Rural Affairs, Wuxi, Jiangsu 214081
  • Received:2022-09-26 Revised:2022-12-27 Online:2023-09-15 Published:2023-09-11

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Abstract:

In order to explore the effect of water quality treatment of ponds after the standardized transformation based on tertiary purification technology, from April 2020 to March 2021, the tail water indicators of the Eriocheir sinensis and adult crab breeding pond (T1), the Litopenaeus vannamei breeding pond (T2), Lateolabrax japonicus breeding pond (T3) and the Ctenopharyngodon idella-Carassius auratus polyculture pond (T4) after the standardization reform in Suzhou area were tracked. Monitoring indicators included pH, total nitrogen (TN), total phosphorus (TP), permanganate index (CODMn), ammonia nitrogen (NH3-N), and water quality evaluation. The results showed that the removal rate of TN, TP, NH3-N, and CODMn by the treatment system during the monitoring period was -61.78%-22.04%, -85.57%-42.89%, -38.66%-33.72%, -13.44%-12.41%, respectively, the pH was relatively stable after treatment, and all indicators met the "Freshwater Pond Aquaculture Water Discharge Requirements" (SC/T 9101—2007) after three-stage purification treatment. During the monitoring period, the pollutants before T1~T4 treatment were mainly NH3-N, TP, TP, TN, and the weight values were 0.3096, 0.2810, 0.3241, 0.2961. After treatment, the pollutants were mainly NH3-N, TN, TP, TP, with weight values of 0.3293, 0.3489, 0.2829, and 0.3405 respectively. According to the results of fuzzy comprehensive evaluation, in winter, crab ponds water was converted from Class V to Class I; In summer and autumn, shrimp ponds water was changed from Class V to Class II; in spring, the sea bass pond water was changed from class V to class IV; in autumn and winter, the grass carp polyculture pond water was changed from class V to class III and class III to class I. This study shows that the culture tail water treatment system of the two filter dams and three purification areas has a good effect on the purification of tail water in crab ponds in winter, shrimp ponds in summer and autumn, sea bass ponds in spring and grass crucian polyculture ponds in autumn and winter in Suzhou.

Key words: pond aquaculture, standardized transformation, tail water treatment, weights, fuzzy comprehensive evaluation