A Study Of The Treatment Of Rural Domestic Sewage By Artificial Intensification Ecological Pond System

This topic in the research and development for decentralized treatment of rural domestic sewage artificial strengthening ecological pond,for the purpose of building a facultative pond-efficient algae pond-aquatic plant pond-buffer pond in series system,research the ecological pond system strengthening efficient pond algae and aquatic plants in the pond under different extension of the light of the change of the water pollutant treatment effect,to explore the aquatic plant pond at different hydraulic retention time,prolonged illumination and aquatic plant cover degree,to simulate the processing characteristics of rural domestic sewage water,and on removing mechanism was discussed.The results are as follows:the efficient algae pond has a high removal effect on rural domestic sewage under the condition of prolonged illumination time.The removal efficiency of COD,TN,NH₄⁺-N,TP and PO₄^3--P was 80.39%,37.36%,41.20%,21.56%and 26.63%,respectively.In terms of algal concentration and photosynthetic rate,Chl-a concentration was 0.21,0.28,0.33 and 0.25mg/L,respectively,in the four groups with extended illumination time of 0,2,4and 6 hours,and the average value of Fv/Fm was 0.44,0.45,0.50 and 0.47,respectively.The group with extended illumination was significantly higher than the group without extended illumination.The removal effect of aquatic plant ponds on rural domestic sewage is high when the illumination time is prolonged.The removal efficiency of COD,TN,NH₄⁺-N,TP and PO₄^3--P was 66.14%,43.44%,36.57%,36.57%and 26.89%,respectively.The concentration of Chl-a in the aquatic plant pond system was 0.05,0.03,0.08 and 0.10mg/L,respectively,in the four groups with the light duration of 0,2,4 and 6 hours,and the removal effect on Chl-a was 71.02%,77.88%,71.45%and 69.63%,respectively.The group with extended light was significantly higher than the group without prolonged light.The orthogonal experiment was designed to explore the key factors affecting the treatment performance of aquatic plant ponds.For COD removal,the best combination of removal effect should be HRT=8d,extended light time 6h and plant coverage of 15%.For TN removal,the best combination of removal effect should be HRT=6d,2h extension of light time and 15%plant coverage.For TP removal,the best removal combination should be HRT=6d,extended illumination time of 2h,and plant coverage of 15%.The removal efficiency of COD in rural domestic sewage was 90.75%,90.22%,93.13%and 92.65%when the illumination time was extended for0,2,4 and 6 hours.The removal efficiency of TN was 35.20%,54.78%,46.99%and 44.59%,respectively.The removal efficiency of NH₄⁺-N was40.45%,65.31%,50.48%and 46.76%,respectively.The removal of TP was 22.20%,40.61%,32.27%and 27.87%,respectively.The removal efficiency of PO₄^3--P was 30.75%,48.33%,42.72%and 43.02%.