Research On Reclaimed Water Reuse With Constructed Wetland

With the population and economy's increasing, freshwater is needed too much more than ever before. There are less and less freshwater with unreasonable using with water. How ever sewage treated company can't afford sewage every day. So we have to sovle the problem in a new way. The constracted wetland is a new sewage treated method, and it fits to small district's sewage treatment. The efficiency of the disposal system is very high, and the index of the final treated water can achieve the"CJ/48-1999".It use physical and biochemical method to treat the sewage. The main installations are pretreatment pool, the adjustive pool, the biomass adsorptive tower and the constracted wetland. The constracted wetland is the most important treated installation, the pretreatment pool, the adjustive pool and the biomass adsorptive tower are pretreatment installation. We study the characteristic of the microorganism in the constructed wetland in the text, and how the microorganism, waterpower burden, pH and temperature influence the treatment effect of the constracted wetland. In the experiment, we study when waterpower burden is 0. 3～0. 5 m3(/m2·d),pH is 6.5～8,temperature 16～18℃, the effect of the constracted wetland is the best. And we can get the best condition from the experiment, the best condition is: waterpower burden is0.4 m3/ ( m2·d ) ,pH is 8.0,temperature 17℃. We also study how the entire treated system treat the sewage. The chroma, CODcr, BOD5 and NH3-N of the untreated water are 210, 270mg/L, 160mg/L, 65mg/L,and the treated water's chroma, CODcr, BOD5 and NH3-N are 30,10 mg/L, 10 mg/L, 10 mg/L. the average efficiency of the treatment are:90%, 96%, 96%, 83%. And the index of the treated water can achieve the"CJ/48～1999".With the experiment, we can see that the constructed wetland have many merit. Such as: high efficiency, convenient, economical, developmental. So it is a new way of sewage treatment in the future.