| With Chinese economic growth rapidly, the environment is degrading, the eutrophication of non-point source pollution problems caused are still not resolved, especially phosphorus water exacerbated urban lake or river serious eutrophication in storm runoff. The constructed wetland treatment storm water runoff is becoming a trend, however, the storm water runoff pollution load changes, hydraulic shock loads and other issues affecting the wetland application effect.The paper mainly express design doubles of the construced wetland, such as phosphorus adsorption matrix easy to saturation, dissolution, secondary pollution, repair and regeneration of problem. As well as some peoblems about the conventional construced wetland design, such as the treatment of pollution load parameters ranging from does not fit, design methods can not meet the requirements of the stormwater runoff treatment, and then, It proposes the development of new phosphorus matrix, and its load to a conventional matrix, the matrix effect of improving the adsorption phosphorus removal. the EMC value of introducing a single rainfall rainwater runoff of phosphorus in the wetland design approach to stormwater runoff EMC value or quarter average phosphorus, to strengthen the optimization of artificial wetland base matrix applied on the design method and examines current domestic conventional construced wetland application Status and phosphorus, as well as domestic handle stormwater runoff wetland reference design specifications and documentation is important for the current artificial wetland treatment of phosphorus in stormwater runoff, the main contents are as follows:(1)Selection of the optimum screening adsorption ferromanganese ferromanganese phosphorus ratio of 1: 5 composite oxide of iron and manganese, adhering to the volcanic rock ceramic by physical and chemical methods and making the experiment about phosphorus adsorption isotherm, adsorption kinetics, factors, and Regeneration. The results showed that the initial concentration of phosphorus n8mg/L, the removal efficiency of more than 90% of the initial concentration of phosphorus ≤8mg/L when, on the contrary, the removal of phosphorus reduced maximum adsorption of phosphorus is 368μg/L. It is Langmuir equation and chemical adsorption type, it comply second-order kinetic model for the monolayer. In the PH of the environment 4-10 adsorption of phosphorus better, it belongs to the type of heat, with increasing adsorption temperature increases; Load of iron and manganese composite oxide ceramic volcanic repair can be performed by acid-base method, under acidic conditions, more resilient, the PH is 2:00 recoverable 55.1%.(2) Compare cylinder means phosphorus removal by running the same thickness are arranged at different depths reinforced ceramic volcanic rocks and gravel experiment, at a flow rate of 140 m L/min, the hydraulic load of 25m3/(m2d), HRT 1min state operating conditions, Treatment with different concentrations of phosphorus in water, the outlet water samples at different depths measured and found the depth 5cm, 10 cm column of phosphorus removal similar effect, that effect is best.(3)By running the same thickness are arranged at different depths of t he load of iron and manganese composite oxide ceramic and volcanic gravel cylinder means. The flow rate of 140 m L/min, hydraulic loading of 25m3/(m2 d), HRT 1min, not backwater occur, leakage, different concentrations of phosphorus with water treatment, arranged to strengthen ceramic depth of 5cm, 10 cm similar post removal, the effect is best, it were able to achieve removal was 51.5%, 35.5% respectively, the strengthening of volcanic ceramic average removal of phosphorus 35.3%. In the initial phosphorus concentration of 4mg/L, the preferable treatment effect is better. The arranged thickness, volume respectively 15 cm, 58.88cm3, during 1min its good correlation on average adsorption capacity of p hosphorus, its unit volume of phosphate adsorption capacity is 0.736g/m3.(4) Arranged by running a depth of 5cm, different thicknesses of the load of iron and manganese composite oxide ceramic and volcanic gravel cylinder means, to treat different initial phosphorus concentration of water distribution. In the water flow of 140 m L/min, hydraulic loading of 25m3/(m2 d), hydraulic retention time of 1min, influent concentration of phosphorus 2.76mg/L, the water flow was 40 m L/min, 70 m L/min, 100 m L/min, when the water flow is 40 m L/min, removal is the best, the strengthening of volcanic gravel filled ceramic cylinder means to phosphorus ability to upgrade 1.3 times.(5)According to the characteristics of phosphorus in stormwater runoff and wetland applications limitations in different locations, to proposed wetland phosphorus load determination method that by monitoring the concentration of runoff and phosphorus runoff, stormwater runoff and phosphorus concentration to make the process flow line, to find the average value of EMC phosphorus concentration, as pollution load parameters. Calculated by simulating the case, to comparison of conventional wetland design parameters and application of reinforced ceramic volcanic wetland design parameters based on phosphorus load and proposes to strengthen the application of ceramic for stormwater runoff treatment wetland area formula and K, α, β parameters. At the same phosphorus loading △C, Qmax conditions, the largest wetland area of the constructed with application strengthen volcanic ceramic reduction than twice the conventional constructed wetland area smaller. |
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