Theoretical And Expeirmental Study On Of Four Dimention Bio-Reactor At Nitrogen Removal

The larger area, power consumption and higher operating costs as well as the existence ofsome environmental pollution problems from the traditional sewage treatment processes aregetting people’s attention. How to use the method of wastewater treatment which is efficient andeconomical has become an urgent problem in water treatment. In this study, the Four DimentionBio-reactor at Nitrogen Removal(FDBNR) is a new sewage treatment facilities, taking AirliftAlternant Loop Complex Bio-filters as the basic unit, the several groups of response units willbe arranged in series, becoming a integrated device which is a continuous and a characteristicsof baffle in the lengthways, and to control the changes in aeration of in the timeline so that thewhole reactor sub-district in different time periods show changes in the processing status offour-dimensional feature. The reactor can occur within the aerobic, anoxic environment at work,the original water shunt was channeled to follow-up processing unit by influent branch,additional carbon source was added for the denitrification without external carbon source, orreturn, in the case of low energy consumption, at the same time to achieve high efficiency in thefunction of removing organic and nitrogen.This study consists of three aspects: First, analysis and research on the fluid dynamics andhydraulic characteristics of FDBNR were made by mathematical derivation and study ofsimplified model; Second, the operating parameters of the process reactor were determined by asmall test; Third, by stabilizing the experiment, study the actual processing capacity of thereactor and the features distribution.The results show that, the baffle of non-aeration unit trends in flow push flow, and there isa case of axial dispersion; Aeration unit cycle of flow approach to the state of whole mixed,Both the flow pattern characteristics of completely mixed reactor and plug flow reactor, underthe control of time axis aeration, two kinds of flow pattern change and complex continuously,reducing the hydraulic dead zone and increasing the reactor volume utilizationThrough the optimization of process parameters about the reactor, the optimum aerationcontrol timing of reactor was determined. Hydraulic retention time was10h, the system shuntratio was5:1, the reactor was operated stably for long-term under these conditions, it was foundthat average removal rate of COD、NH3-N、total nitrogen by the reactor was93.13%、93.29%and61.73%respectively, the consistency of outlet water was20.4mg/L、1.64mg/L and17.2mg/L, all meeting the first grade of the《Nitional discharge standard of pollutants formunicipal wastewater treatment plant》(GB18918-2002). In this article, the processing property of the Four Dimention Bio-reactor at NitrogenRemoval were studied, and it was applied to distributed sewage treatment during laboratorystage,and gained good results. It provides certain scientific evidence and theory for popularizingand application of this new reactor, as well as a new method for distributed sewage treatment.