| In recent years,China's social and economic development has been rapid,and the environmental problems left over from this have gradually emerged,the water environmental pollution problem is serious,it is urgent to solve.For small lakes,the pollution of river water quality to eutrophication of water body,the traditional single treatment technology and the technology of artificial floating island can't achieve ideal processing effect,so in view of the eutrophication of water bodies,this article put forward the technique of artificial floating island,oxygen aeration complex technology,biological contact oxidation technology,bioremediation technology of combining the processing technology of water pollution.The experimental results show that:(1)The aquatic plants coppergrass and red wave have strong vitality,in which the removal rate of TP and ammonia nitrogen is 37.4%and 17.3%respectively.Both of them can remove some polluted elements such as N and P from water.After artificial modification,natural gravel packing is not only environmentally friendly but also has a large specific surface area and easy to be attached by microorganisms.Three kinds of packing height were selected for comparison,namely 5cm,10cm and 15cm,respectively.The removal rate of TP was 87.8%,90.27%and 92.82%,while the removal rate of COD was 87.16%,90.05%and91.27%,respectively.Therefore,the higher the packing height was,the better the sewage treatment effect would be;(2)The main factors influencing the processing effect of the process are as follows:temperature,PH,concentration of dissolved oxygen in water.The optimum temperature suitable for this process is 20?,p H 7.6 and dissolved oxygen concentration 7.01mg/L.Among them,the change of DO value in water has the most significant influence on the treatment effect.Compared with no aeration treatment,when the dissolved oxygen concentration is 7.01mg/L,the removal rate of TP is increased by 23.38%,the removal efficiency of ammonia nitrogen is increased by 56.37%,and the removal rate of COD is increased by 4.64%;In this experiment,three dissolved oxygen concentrations were selected for comparison,respectively 5.95mg/L,7.01mg/L and 8.02mg/L.With the increase of dissolved oxygen content,the removal efficiency of TP,ammonia nitrogen and COD in water was higher.However,when the dissolved oxygen content rises to a certain value,the removal rate of pollutants in water gradually flattens out.Considering the economic cost and water treatment demand,the dissolved oxygen was 7.01 mg/L.(3)For eutrophication water,this enhanced artificial floating island technology can significantly improve the treatment effect of sewage compared with the artificial floating island technology,which can improve the extremely eutrophication water to the nutrient-poor water,while the artificial floating island technology cannot achieve such treatment effect in a short time.After 9 days of treatment,the removal rate of TP,nitrite nitrogen and COD increased by 42.97%,4.92%and 25.96%respectively.(4)In order to analyze the feasibility of this process,the author takes wuhan tanghu as the object of engineering application.In the project,the floating island covers an area of 3200m~2,the height of packing is 50cm,a total of 800kg of plants are needed,and the volume of water can be treated as 3000m~3.This project adopts solar panel power generation technology,air-blast and micro-porous distribution air pipe aeration equipment,and the total oxygen demand of the treated lake is 5.08kg O~2/d calculated according to the first-stage reaction box model.The total investment of this project is 513,000 yuan in the early stage of operation.Through a series of experimental studies and practical case analysis shows that:For eutrophication water body,the artificial floating island treatment technology is strengthened by contact aeration oxidation,which has good treatment effect.Eutrophication of water bodies after processing,the lake water quality can meet the water quality standard of surface water?class. |
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