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/>1、為什么用BOD和COD作為污染物指標(biāo)？</span></p><p><span style="font-size:16px">在污廢水中，大多數(shù)的污染物是有機(jī)物。但是廢水中的有機(jī)物種類少的可能幾十種多的有上百種甚至上千種我們不可能把每種有機(jī)物都拿出來(lái)作為出水指標(biāo)。此時(shí)就需要有一個(gè)統(tǒng)一的指標(biāo)來(lái)代表廢水中的有機(jī)物。我們知道有機(jī)物都是由碳?xì)浣M成的可以被強(qiáng)氧化劑氧化或者被微生物氧化分解產(chǎn)物是二氧化碳和水。在氧化的過(guò)程中會(huì)消耗氧氣耗氧量越多就代表廢水中有機(jī)物越多所以用化學(xué)需氧量和生化需氧量也就是COD和BOD來(lái)代表廢水中有機(jī)物的含量。<br /><br />2、什么是BOD和COD？<br /><br />BOD指的就是微生物分解有機(jī)物所需要的溶解氧的含量。在實(shí)際測(cè)定水中的溶解氧消耗情況時(shí)一般采用5天作為一個(gè)周期稱為BOD5。COD是指在一定條件下測(cè)定單位體積水樣中還原性物質(zhì)所消耗的氧化劑的量一般用重鉻酸鉀法稱為CODcr。BOD和COD數(shù)值越高水質(zhì)污染越嚴(yán)重</span></p><p><span style="font-size:16px">3、BOD和COD有什么區(qū)別？</span></p><p><span style="font-size:16px">廢水中的有機(jī)物分為可降解有機(jī)物和不可降解有機(jī)物微生物可以利用的只有可降解有機(jī)物<br />而強(qiáng)氧化劑可以氧化所有有機(jī)物所以BOD表示可降解的有機(jī)物。COD表示所有有機(jī)物，這兩個(gè)數(shù)據(jù)的差值表示不可降解有機(jī)物。在不出現(xiàn)測(cè)定失誤的情況下，COD一定是大于BOD的。通常可以用BOD/COD的值來(lái)粗略的表示廢水的可生化性，一般是大于0.3時(shí)認(rèn)為廢水具有可生化性二者比值越大廢水可生化性越高。</span></p> </div> <div 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