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【Abstract】Setanaerobic, naoxic section Carrous oxidation ditch with biologicla nitrogen and phosphoru sremoval capabilitie, is curren dythe mainstream of city life process of sewage treatment, This article descirbes the structure of Carrousel oxidation ditch, porcess and design problems during the oper-ation and the corresponding solutions．
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【Keywords】Carrousel；Oxidationditch；Phosphorusnadnitrogenremoval；Structure；Mechanism5318
1. Foreword
Oxidize the ditch( oxidation ditch) again a continuous circulation spirit pond( Continuous loop reactor), is a live and dirty mire method a kind of to transform.Oxidizing the dirty water in ditch handles the craft be researched to manufacture by the hygiene engineering graduateschool of Holland in the 50'sof20centuriessuccess.Since in
1954 at Dutch throw in the usage for the velY first nme.secause its a water fluid matter good, circulate the stability and manage convenience etc. technique characteristics, already at domestic and international and extensive application in live the dirty water to is dirty to manage aquecustv with the industlYli).
Current application than oxidize extensively the ditch type include:The ( Pasveer) oxidizes the ditch, the (Carrousel) oxidizes the ditch, ( Orbal) oxidizes the ditch, the type of T oxidizes the ditch( three ditch types oxidize the ditch), the type of DE oxidizes the ditch to turn to oxidize the ditch with the Integral whore.these oxidize the ditch because of the difference of esse in construction with circulating, therefore each characteristics[2].This text will introduce construction, mechanism, existent problem and its latest developments that Carrousel oxidize ditches primarily.
2. The Carrousel oxidizes the construction of the ditch
The Carrousel Oxidize the ditch to be researched to manufacture by Dutch DHV company development in 1967.0xidize the last the companyofDHVinfou ndationoftheditchin theoriginal Carrousel to permited specially the company EIMCO to invent again with its patent in the United States Carrousel 2000 system realizes the living creature of the higher request takes off the nitrogen with pidedbythefunctionof.Therehasbeen in the world up to now more than 850 Carrousels oxidize the ditch with the Carrousel 2000 system are circulating
From diagram therefore, the Carrousel oxidizes the ditch the usage the spirit of that definite direction control with shake up the device, face to mix with the liquid deliver the level speed, from but make drive the liquid of admixture that shake up is in oxidize ditch shut match outlet circulate nowrnererore oxidize the ditch have the special hydraulics flows the ,current complete mix with the characteristics of the type reactor, have the characteristics that push the flow type reactor again, the ditch inside exsrts obviously of deliquescence oxygen density steps degree.Oxidizing the ditch cross section is rectangle or trapezoids, the fiat surface shape is many for oval, the ditch internal water is deep general for 2.5 -4 .5 m , the breadth is deep compare for 2:1, also have the deep wate r amount to 7 ms of, ditch inside average speed in water current is 0.3 mS/ s.ostorze ditch spirit admixture equipments contain surface spirit machine, the spirit of turn to brush or turn the dish and shoot to flow the spirit machine, pipe type spirit machine with promote take care of type spirit machine etc., match with in recent years usage still contain underwater push machine
3. The Carrousel oxidizes the mechanism of the ditch
3.1 The Carrousel oxidizes the ditch handles dirty and aqueous principle
The at the beginning common Carrousel oxidizes the dirty water In inside In craft of the ditch direct with dirty mire In reflux together enteroxidize theditch system.The surface spiritmachinemakesfuse In the liquid of admixture the density of the oxygen DO increases about 2 the 3 mgsl t.uncer this kind of well the term of the oxygen, the microorganism gets the enough deliquescence oxygen comes and go to pided by the BOD;At the same time, the ammonia were too oxidized nitrate with second nitrate, this time, mix with the liquid be placed in the oxygen appearance.In the spirit machine downstream, after water current be become by the swift flow appearance of the spirit District oP even flow the appearance, the water current maintainsin theminim umcurrentvelocity,guaranteeingthe liveand dirty mire be placed in the floats the appearance.( average current vercctvs-o.a msl s)Oxldlze microbially the process consumed to fuse theoxygenin thewater,until thevalueofDOdeclinesforzero, mixing with the liquid report the anoxia appearance.versa nitric that turn the function through anoxia area, mix with the liquid enter to have the oxygen area, completing once circulating.That system inside, the BOD declines the solution is a continuous process, the nitric turns the function to turn with the versa nitric ~e function ta ke place in same pond.Because of structural restrict, this kind of oxidize the ditch although can then valid whereabouts BOD, pided by the phosphorus take off the nitrogenous ability ltmrtedt".