Abstract:
The characteristics and sedimentation features of tail water discharged from tilapia farming are the key factors influencing the design of sedimentation ponds and also the precondition and foundation for achieving efficient treatment of tail water. Taking the tail water from tilapia farming in Hainan as the research object, through conducting pollution monitoring and static sedimentation experiments on the farmed discharged tail water and the surrounding environment, the concentrations of total nitrogen (TN), total phosphorus (TP), chemical oxygen demand (CODMn), and suspended particulate matter (SS) in the water body were determined, and the pollution situation in the tail water and the reasonable sedimentation time for tail water treatment were analyzed and summarized. The results indicated that the concentration ranges of TN, TP, CODMn, and SS in the tail water from tilapia farming were 2.00 - 15.60 mg/L, 0.59 - 2.74 mg/L, 17.20 - 20.40 mg/L, and 2.50 - 144.00 mg/L, respectively; the concentration ranges of TN, TP, CODMn, and SS in the surrounding water of the culture ponds were 2.20 - 5.80 mg/L, 0.44 - 3.21 mg/L, 4.05 - 18.95 mg/L, and 55.00 - 152.00 mg/L, respectively; the average proportions of particulate nitrogen (TPN) and phosphorus (TPP) in the tail water were 20.80% - 62.80% and 50.80% - 74.90%, respectively. After 24 hours of static sedimentation treatment of the tail water, the decrease rate of SS in the upper water layer reached 83.08%, and the SS concentration decreased by 84.62% after 48 hours of static sedimentation treatment, and the sedimentation effect tended to be stable. Considering comprehensively, the static sedimentation time of the tail water can be selected as 24 hours, which can effectively remove the suspended pollutants in the water body.
Key words:
tilapia mossambica,
wastewater treatment,
static settlement,
suspended pollutants
摘要： 罗非鱼养殖排放尾水特征及沉降特点是影响尾水处理沉淀池设计的关键因素，也是实现尾水高效处理的前提和基础。本研究以海南罗非鱼养殖尾水为研究对象，通过对养殖排放尾水和周边环境进行污染监测及静沉降试验，测定水体总氮(TN)、总磷(TP)、化学需氧量(CODMn)、悬浮颗粒物(TSS)浓度，分析总结罗非鱼养殖尾水中污染情况及尾水处理合理沉降时间。结果显示：罗非鱼养殖尾水中TN、TP、CODMn和TSS的质量浓度范围分别为2.00~15.60、0.59~2.74、17.20~20.40和2.50~144.00 mg/L；养殖池周边水体TN、TP、CODMn和TSS的浓度范围分别为2.20~5.80、0.44~3.21、4.05~18.95和55.00~152.00 mg/L；养殖尾水中颗粒态氮(TPN)、磷(TPP)平均占比分别为20.80%~62.80%、50.80%~74.90%。尾水经静沉降处理24 h后，上层水体中TSS的下降率达到83.08%，静沉降处理48 h后TSS质量浓度下降84.62%，沉降效果趋于稳定。综合考虑，尾水静沉降时间建议选24 h可有效去除水体中悬浮污染物。
关键词:
罗非鱼,
尾水治理,
静沉降,
悬浮污染物
CHENG Guofeng, GUO Zeyu, WANG Jie, LIU Shikun, CHEN Zhe, CHENG Xiangyu, LIU Xingguo. Discharge pattern and sedimentation characteristics of tilapia aquaculture wastewater [J]. Fishery Modernization, 2024, 51(6): 61-.
程果锋, 郭泽裕, 王婕, 刘士坤, 陈哲, 程翔宇, 刘兴国. 罗非鱼养殖尾水污染物沉降特征研究[J]. 渔业现代化, 2024, 51(6): 61-.