Comparative Analysis Of The Applicablility Of The Oxidation Ditch Process

As a variant of the activated sludge process, oxidation ditch process is generally used asthe major sewage treatment plant for the wastewater treatment plant because of its simplestructure, strong impact resistance load capacity, less investment in infrastructure, lowoperating costs and the stability of the treatment effect, etc. Therefore, there have a certaintheoretical significance and practical value on the optimizing of the oxidation ditch processdesign methods and the studying of conditions on application of various types oxidation ditchprocess.With the comprehensive analysis of the domestic commonly used oxidation ditch processdesign method, the commonly used four dynamics calculation method for the contrastanalysis, and the investigation data of the12domestic oxidation ditch as a basis forcomparison accounts, the results of this article show that the applicable scope of the methodwhich recommended by the ‘Technical Specifications for Oxidation Ditch Activated SludgeProcess’ is more widely, and the design value and the actual value of the difference betweenthe minimum,and the design of the results are more identical with the practical operationcondition. So, this method recommended as the preferred method of the oxidation ditchprocess design in our country. And in this method, the key is how to choose the reasonablesludge production rate. We suggest using the German ATV as the basic calculation formula.And combining with the actual conditions of our country we can by a correction coefficient0.9.By designing the Orbal oxidation ditch, T oxidation ditch, DE oxidation ditch, Carrouseloxidation ditch, micro aeration oxidation ditch process, and comprehensive analysis from thefour quantitative indicators of total investment, total energy consumption, and operation cost,cover an area of an area, we get the applicable condition of each type of the oxidation ditch inthe sewage treatment plants:Total energy consumption: Orbal＜T＜DE＜Micro aeration＜Carrousel. Compared withT oxidation ditch, DE oxidation ditch, micro aeration oxidation ditch and Carrousel oxidationditch. Orbal oxidation ditch’s energy saving percentage for0.3%~3%,6%~8%,7%~10%and9%~14%respectively.Operation cost: Orbal＜T＜DE＜Micro aeration＜Carrousel. Compared with Toxidation ditch, DE oxidation ditch, micro aeration oxidation ditch and Carrousel oxidationditch.Orbal oxidation ditch’s operation cost saving percentage for1.3%~1.8%,2.3%~4.8%，3%~6.2%and5%~9%respectively. Total investment: T＜Orbal＜DE＜Carrousel＜Micro aeration. Compared with Orbaloxidation ditch, DE oxidation ditch, Carrousel oxidation ditch and micro aeration oxidationditch. T oxidation ditch’s total investment saving percentage for0.2%~1.3%,1%~4%、4%~6.6%and6.9%~10.7%respectively.Covers area: Micro aeration＜Carrousel＜Orbal＜T＜DE. Compared with Carrouseloxidation ditch, Orbal oxidation ditch, T oxidation ditch and DE oxidation ditch. Microaeration oxidation ditch’s covers area saving percentage for5%~8.8%,10%~23%,12%~37%,and20%~43%respectively.