Reaearch On Shallow Surface Flow Constructed Wetland Of Reaction Kinetics In Dephosphorization And Decarburization

According the structure of sewage discharge and the situation of sewage treatment in our country nowadays,it is known that domestic sewage discharge contribute large proportion in the pollution of water and ecosystem.Because the huge number of drainage causes a great quatity of pollutants enter into the river basin,and the domestic sewage scattered can t get effective treatment,which burden the water quality and ecosystem, and even cause pollution.At present,the domestic and foreign often use constructed wetland in the depth processing or directly deal with the sewage discharged,but the constructed wetland existe a problem which is matrix blocking,thus affecting the quality of the water treatment effect, and shortening the service life of the system.This shallow surface flow constructed wetland can effectively reduce the water load, so it can be used as pretreatement of other traditional constructed wetland,if this, this system can keep the good water quality and extend the fixed number of year of constructed wetland.This paper based on the dephosphorization and decarburization of shallow surfaces constructed wetland which choose clay and pebbles mixed as matrix and native plants ShuiZhu as plant.The test divided to three parts,preparation period,domestication period and maturity period.The preparation period set for the system construction and the plant natural growth,domestication period set for the controlzation of dephosphorization and decarburization to smooth, mature period set for the further research.The experiment shows that the COD and TP treated stably need about20days;Through the research on dephosphorization and decarburization under the different hydraulic loading,the experiment find that the operation of the best hydraulic loading is0.2m3/m2.d;Through the research of distance of dephosphorization and decarburization under different hydraulic loading,it find that in1/2bed body COD can remove90%of total removal rate,in3/4bed body TP can remove80%of total removal rate; Through the research of depth of dephosphorization and decarburization under different hydraulic loading,it find that with the depth increasing,the removal rate also increase;Through the research of DO s effection in dephosphorization and decarburization under best hydraulic loading,and combined with the distance and depth in removing COD and TP,it finds that DO can help to remove COD and TP,and microbial plays an important role in the decarbonization;Through the research of plants in dephosphorization in three periods,and the research of change rule of TP in domestication period,compared influence of DO in COD and TP, it finds that matrix contribute a large role in dephosphorization.This paper based on the shallow surface flow constructed wetland seted in laboratory, in the experiment it investigates the effect of dephosphorization and decarburization in different conditions,analyses the mechanism.So it can be best used as pretreatment of other constructe wetland,and can have better application in depth of the water quality treatment and the treatment of domestic sewage scattered.