罗非鱼养殖尾水污染物沉降特征研究OA北大核心CSTPCD

The characteristics and sedimentation features of tail water discharged from tilapia(Oreochromis mossambicus)farming are the key factors influencing the design of sedimentation ponds,as well as 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(TSS)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 TSS 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 TSS 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 TSS in the upper water layer reached 83.08%.The TSS concentration decreased by 84.62%after 48 hours of static sedimentation treatment,and the sedimentation effect tended to be stable.Considering comprehensiveness,the static sedimentation time of the tail water can be selected as 24 hours,effectively removing the suspended pollutants in the water body.