推荐回答(2个)
五日化学需氧量
表示水中有机物等需氧污染物质含量的一个综合指示.说明水中有机物由于微生物的生化作用进行氧化分解,使之无机化或气体化时所消耗水中溶解氧的总数量.
5日生化需要量,主要代表污水中容易生化降解的指标。各种不同类型的废水BOD5和
CODcr之间有一定的比例关系。原则上BOD5比例越高废水的可生化性相对较好。BOD5一般
在生化培养箱用富氧水培养5天,再采取滴定法测定其含量。
生化耗氧量是“生物化学需氧量”的简称。常记为BOD,是指在一定期间内,微生物分解
一定体积水中的某些可被氧化物质,特别是有机物质所消耗的溶解氧的数量。以毫克/升
或百分率、ppm表示。它是反映水中有机污染物含量的一个综合指标。如果进行生物氧化
的时间为五天就称为五日生化需氧量(BOD5),相应地还有BOD10、BOD20 。
什么是BOD
BOD:生化需氧量,即是一种用微生物代谢作用所消耗的溶解氧量来间接表示水体被有机
物污染程度的一个重要指标。其定义是:在有氧条件下,好氧微生物氧化分解单位体积
水中有机物所消耗的游离氧的数量,表示单位为氧的毫克/升(O2,mg/l)。
一般有机物在微生物的新陈代谢作用下,其降解过程可分为两个阶段,*阶段是有机
物转化为CO2、NH3、和H2O的过程。第二阶段则是NH3进一步在亚硝化菌和硝化菌的作用
下,转化为亚硝酸盐和硝酸盐,即所谓硝化过程。NH3已是无机物,污水的生化需氧量一
般只指有机物在*阶段生化反应所需要的氧量。微生物对有机物的降解与温度有关,
一般zui适宜的温度是15~30℃,所以在测定生化需氧量时一般以20℃作为测定的标准温
度。20℃时在BOD的测定条件(氧充足、不搅动)下,一般有机物20天才能够基本完成在
*阶段的氧化分解过程(完成过程的99%)。就是说,测定*阶段的生化需氧量,
需要20天,这在实际工作中是难以做到的。为此又规定一个标准时间,一般以5日作为测
定BOD的标准时间,因而称之为五日生化需氧量,以BOD5表示之。BOD5约为BOD20的70%
左右。
五日化学需氧量
表示水中有机物等需氧污染物质含量的一个综合指示.说明水中有机物由于微生物的生化作用进行氧化分解,使之无机化或气体化时所消耗水中溶解氧的总数量.
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