废水处理工艺设计的光解,除垢,管道与控制.pptx

废水处理工艺设计及计算第6章9-11节? 6-9 PHOTOLYSIS 光解? 6-10 CHEMICAL NEUTRALIZATION SCALE CONTROL STABILIZATION 化学中和 水垢控制 稳定性目录『CONTENT』? 6-11 CHEMICAL STORAGE, FEEDING, PIPING, CONTROL SYSTEMS 化学贮藏、供给、管道 及控制系统6-9PHOTOLYSIS16-9定义Photolysis is a process by which constituents are broken down by exposure and absorption of photons from a light source. As with AOPs, the primary use of photolysis is for the removal of trace organic compounds in water reuse applications. In natural systems, sunlight is the light source for photolysis reactions, however, in engineered systems, ultraviolet (UV) lamps are used to produce the photonic energy. The effectiveness of the photolysis process depends, in part, on the characteristics of the reclaimed water, structure of the compounds, design of the photolysis reactor, and dose and wavelength of the applied light. The photolysis rate can be estimated from the rate at which the compound absorbs light and the photonic efficiency of the reaction (quantum yield).1原理6-9The photons that are absorbed cause the electrons in the outer orbital of some compounds forms an unstable compound that splits apart or becomes reactive.光解工艺 Photolysis ProcessesEngineered photolysis reactions are conducted in specially designed reactors optimized with respect to UV dose. Photolysis reactors are typically comprised of a stainless steel column or pipe containing UV lamps arranged parallel to the flow, perpendicular to the flow, or in a crisscrossing pattern perpendicular to the direction of flow. UV与O3、H2O2、Fenton联用。UV会促进H2O2产生OH·但加入H2O2会抑制某些有机物的分解Fouling that may occur on the outside of the UV lamp protective quartz sleeve may be managed using an automatic cleaning system consisting of a collar that periodically moves along the lamp to remove precipitates and intercepted matter. When used in conjunction with reverse osmosis pretreatment, the chemicals added to reduce the pH for scale control in the membranes will also reduce the potential for precipitation on