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是混合液懸浮固體濃度，即污泥濃度，表示曝氣池中單位體積混合液所含懸浮固體的濃度，它是間接反映混合液中所含微生物量。為了保持曝氣池的凈化效率，在池內(nèi)維持一定量的污泥濃度。一般說，對于普通活性污泥法，曝氣池內(nèi)MLSS ?？刂圃?～3g/L。 </p><p> 污水處理中經(jīng)常會用濁度計對污泥濃度進(jìn)行測量，濁度跟污泥濃度是同一個概念嗎？顯然不是。雖然單位都是mg/l，但作為濁度單位的mg/l 和作為濃度單位的mg/l 是兩個*不同的概念，前者是光學(xué)單位，后者是質(zhì)量含量單位，兩者之間不存在數(shù)值上的相應(yīng)或等同關(guān)系。</p><p> 濁度相同的懸濁液，其濃度可能*不同；濃度相同的懸濁液，其濃度差異也往往很大。但對于同一懸濁液來說，濁度跟濃度（ss）存在對應(yīng)關(guān)系：濁度=a×濃度（ss）其中a 為常數(shù) 也就是說對于同一（或成分相同）懸濁液來說，濁度跟濃度（ss）存在線性對應(yīng)關(guān)系濁度為A 的懸濁液，測得濃度為B；對懸濁液進(jìn)行稀釋至濁度變?yōu)閚×A，此時濃度（ss）值必然為n×B。利用這個關(guān)系，可以采用在線濁度計對濃度（ss）進(jìn)行測量的，測出污泥的濁度后，在實驗室中采用重量法測定其濃度（ss），然后將濁度折算成濃度，對濁度計進(jìn)行標(biāo)定（詳細(xì)標(biāo)定方法）。也就是說，標(biāo)定后的在線濁度計顯示的不再是的濁度值，而是濃度（ss）值。 </p><p> 濁度計的測量范圍如何劃分？各適用于什么場合？</p><p> 濁度的測量范圍尚無統(tǒng)一、明確的劃分，習(xí)慣上根據(jù)測量對象或應(yīng)用場所的不同，將其劃分為低、中、高三段。</p><p> (1) 低濁度測量范圍在0～100NTU(或0～400NTU)。主要適用場合為高純水和飲用水工藝；自來水廠和工業(yè)水處理中的混凝沉淀監(jiān)測；過濾器反沖洗控制和泄漏監(jiān)測；工業(yè)水處理中離子交換器進(jìn)水監(jiān)測。</p><p> (2) 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