| This article mainly conducts research on the two functions of ecological ponds for rainwater regulation and water purification.During the long-term operation of the ecological pond,the poor fluidity of the water body will cause the accumulation of pollutants,which will lead to the weakening of the ability of the water body to purify the pollutants.When the pollutants in the water body are reduced,the pollutants deposited in the sediment will release the pollutants to the water body.After undergoing secondary pollution.Through long-term monitoring of the pollutant concentration changes in the water body and sediment in the ecological pond during rainfall and five days after rainfall,the water body’s ability to purify pollutants is studied,and the pollution risk of the water body and sediment is evaluated at the same time.The storage capacity of the ecological pond is passed by SWMM The software is simulated;and then through the intensified experiment of in DO or purification of pollutants,the conclusions are as follows:(1)The water body in the ecological pond has a strong self-purification adjustment ability for pollutants,and the overall performance is that the concentration of pollutants in summer is higher than in winter.Through the evaluation method,it is analyzed that the water in the ecological pond of the National Expo Center is mainly polluted by COD.Among them,the COD of the No.3 storage pond is the most serious and moderately polluted;the turbidity of No.3 and No.4 in the storage pond is obviously biased.Large,the water samples taken out are all yellow,and its role as a landscape water body is poor.It is recommended to solidify the No.3 and No.4 storage ponds,and clean the bottom mud of the remaining ecological ponds to avoid the release of a large amount of pollutants from the bottom mud and cause secondary pollution to the water body.(2)Under the condition of natural standing,compared with the hard group,the self-purification effect of the water body is enhanced after adding 10 cm thick soil as low quality.The comprehensive ammonia nitrogen,TN,TP,COD four pollutants indicators found that the water body The best self-purification enhancement effect is the soil + sediment group,and its removal rate is 50.52%,50.54%,54.32%,and 60.36%;under aeration conditions,comprehensive purification of four pollutants: ammonia nitrogen,TN,TP,and COD It is found that the soil + zeolite group has the best selfpurification enhancement effect on the water body.The removal rate of the soil + zeolite group on the four pollutants are: 50.9%,66.89%,57.46%,69%;through the water purification pollutant enhancement experiment,it is recommended The bottom mud in the ecological pond is partially cleaned to prevent the bottom mud from being disturbed and secondary pollution to the water body.At the same time,zeolite can be laid at the bottom as a filler to enhance the purification ability of water pollutants.(3)The effect is best when the DO sage of PAC is 30mg/L,and the removal rate of SS,turbidity,ammonia nitrogen,TN,TP,COD are 98.58%,92.96%,3.19%,23.2%,92.57% in sequence,43.85%,but when the use amount is 20mg/L,the removal rate is not much different from 30mg/L.Comprehensive economic and environmental factors can use 20mg/L to treat the water body;control the water temperature of the three beakers at three temperature environments of 10.5 ℃,22.3 ℃,and 31.1 ℃,comprehensive analysis of the removal effect of SS,turbidity,ammonia nitrogen,TN,TP,COD found that the higher the temperature,the better the removal of pollutants.When the water temperature reaches The removal rates of the six pollutants at 31.1℃were 98.99%,98.77%,4.27%,30.87%,95.78%,24.78%,respectively.(4)When the return period is once a year,after adding rainwater ponds,the peak flow rate of No.1 discharge outlet is reduced by 57.53%,the peak time is delayed by87 minutes,and the peak flow rate of No.2 discharge outlet is reduced by 45.21%,the peak time Delayed by 55 minutes;when the recurrence period is once every three years,the peak flow rate at No.1 discharge port is reduced by 66.40%,the peak time is delayed by 108 minutes,the peak flow rate at No.2 discharge port is weakened by 56%,and the peak time is delayed by 65 minutes;When the return period is once every five years,the peak flow rate at the No.1 outlet is reduced by 71.52%,and the peak time is delayed by 98 minutes.The peak flow rate at the No.2 outlet is weakened by 58.94%,and the peak time is delayed by 69 minutes;when the return period is When it happened once in ten years,the peak flow rate of No.1 discharge port was reduced by 76.56%,the peak time was delayed by 91 minutes,the peak flow rate of No.2 discharge port was weakened by 64.55%,and the peak time was delayed by 47 minutes. |
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