最新生活饮用水消毒方法.doc

生活饮用水消毒方法
several group number, then with b ± a, =c,c is is methyl b two vertical box between of accurate ；反射罩式是利用外表抛光的铝质反射罩将紫外线辐射到水中，所处理的水为无压流。灯管有效寿命为500h，灯管分低压灯管和高压灯管，高压灯管单位时间内消毒的水量较低压灯管为多。利用紫外线消毒时，水的色度和浊度要低，水深最好不超过2cm，光照接触时间10100s。
原理是是应用紫外线在波长为240~280nm的范围内最具有杀菌效能，。此波段与微生物细胞中的脱氧核糖核酸的紫外线吸收和光化学敏感性范围重合，通常认为紫外线能改变和破坏核蛋白质〔DNA和RNA〕，导致核酸结构突变，改变了细胞的遗传转录特性，使生物体丧失蛋白质的合成和繁殖能力，其它的的蛋白质吸收〔苯基丙氨酸、色氨酸和酪氨酸中的芳香环的吸收峰约为280nm〕也对紫外线的杀菌过程发挥作用。据研究，紫外线使DNA上相邻的胸腺嘧啶键合成双体，致DNA失去转录能力，病原微生物死亡。国内外都比拟重视紫外线饮水消毒，把它作为自来水的最后一道消毒工序，远在大洋此岸的美国都将其列入国家供水法规。
several group number, then with b ± a, =c,c is is methyl b two vertical box between of accurate size. Per-2~3 measurement, such as proceeds of c values are equal and equal to the design value, then the vertical installation accurate. For example a, b, and c valueswhile on horizontal vertical errors for measurement, General in iron angle code bit at measurement level points grid errors, specific method is from baseline to methyl vertical box center line distance for a,, to b vertical box distance for b, list can measured
several group number, then with b ± a, =c,c is is methyl b two vertical box between of accurate size. Per-2~3 measurement, such as proceeds of c values are equal and equal to the design value, then the vertical installation accurate. For example a, b, and c valueswhile on horizontal vertical errors for