氧化沟_毕业论文外文文献翻译.doc

附　录 PAGE 16 外文资料翻译 Oxidation ditches 1. Introduction Oxidation ditch and continuous circular aeration tank, deformation is one of the activated sludge process. Oxidation ditch sewage treatment technology is successfully developed by the Dutch in the 1950 s and health engineering. Put into use in the Netherlands for the first time since 1954. Due to its good effluent water quality, steady operation, convenient management and other technical characteristics, has been widely used both at home and abroad in domestic sewage and industrial wastewater treatment. The types of the oxidation ditch has been widely applied at present include: pass, oxidation ditch, the Carrousel oxidation ditch, Mr. Bell oxidation ditch, T oxidation ditch, three groove type oxidation ditch, and the integration of DE type oxidation ditch and oxidation ditch. The oxidation ditch because of the differences on the structure and operation, so each has its characteristics. This paper will mainly introduce Carrousel’s structure, the mechanism of the oxidation ditch, the existence question and its latest development. 2. The structure of Carrousel oxidation ditch Carrousel oxidation ditch is DHV Company developed in 1967 by the Dutch. On the basis of the original Carrousel oxidation ditch DHV EIMCO it’s patented in the United States Company and created the Carrousel 2000 System, realizes the higher requirements of biological denitrification and phosphorus removal function. By far the world has more than 850Carrousel oxidation ditch and Carrousel 2000 System is running. Carrousel oxidation ditch with directional control of aeration and agitation device, the mixture transfer horizontal velocity, which was stirring the mixture of circulating in the oxidation ditch channels closed. Oxidation ditch has special hydraulic flow state, therefore, has the characteristics of both the completely mixed reactor and has the characteristic of push flow reactor, groove exists obvious dissolved oxygen conce