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</span></p><p><span><br/></span></p><p><span>什么是COD？</span></p><p><span><br/></span></p><p><span>COD(化學需氧量)：是在一定的條件下，采用一定的強氧化劑處理水樣時，所消耗的氧化劑量。它反映了水中受物質(zhì)污染的程度，化學需氧量越大，說明水中受有機物的污染越嚴重。COD以mg/L表示，通過水質(zhì)監(jiān)測儀器檢測出的COD數(shù)值，水質(zhì)可分為五大類，其中一類和二類COD≤15mg/L，基本上能達到飲用水標準，數(shù)值大于二類的水不能作為飲用水的，其中三類COD≤20mg/L、四類COD≤30mg/L、五類COD≤40mg/L屬于污染水質(zhì)，COD數(shù)值越高，污染就越嚴重。</span></p><p><span><br/></span></p><p><span> </span></p><p><span><br/></span></p><p><span>BOD又是什么？</span></p><p><span><br/></span></p><p><span>BOD(生化需氧量)：是指在有氧的條件下，水中微生物分解有機物的生物化學過程中所需溶解氧的質(zhì)量濃度。為了使BOD檢測數(shù)值有可比性，一般規(guī)定一個時間周期，并測定水中溶解氧消耗情況，一般采用五天時間，稱為五日生化需氧量，記做BOD5，經(jīng)常使用五日生化需氧量。BOD數(shù)值越大證明水中含有的有機物越多，因此污染也越嚴重。</span></p><p><span><br/></span></p><p><span>BOD是一種環(huán)境監(jiān)測指標，用于監(jiān)測水中有機物污染情況，有機物都可以被微生物分解，此過程中需要消耗氧，如果水中溶解氧不足以供給微生物的需要，水體就處理污染狀態(tài)。</span></p><p><span><br/></span></p><p><span> </span></p><p><span><br/></span></p><p><span>COD和BOD有什么關系呢？</span></p><p><span><br/></span></p><p><span>在污水處理過程中，有機物質(zhì)有上百種，對這些有機物質(zhì)進行逐一分析，既耗時間，又耗藥品。經(jīng)過研究發(fā)現(xiàn)，所有的有機物質(zhì)都有二個共性，一是它們都由碳氫組成，二是絕大多數(shù)的有機物質(zhì)能夠化學氧化或被微生物氧化，它們的碳和氫分別與氧形成無毒無害的二氧化碳和水。污水中的有機物質(zhì)不論是在化學氧化過程中還是在生物氧化過程中都要消耗氧，廢水中的有機物質(zhì)愈多，則消耗的氧量也愈多，二者之間是呈正比例關系的。于是，將污水用化學藥劑氧化所消耗的氧量稱為COD(化學需氧量)，將污水中微生物氧化所消耗的氧量稱為BOD(生氣需氧量)。</span></p><p><span><br/></span></p><p><span> </span></p><p><span><br/></span></p><p><span>由于COD(化學需氧量)與BOD(生氣需氧量)能夠綜合性地反映水中所有有機物的數(shù)量，此類檢測儀器也比較多，檢測方法簡單，較短時間內(nèi)就能拿到檢測結果，在因此被廣泛用于水質(zhì)檢測分析上，成為水質(zhì)監(jiān)測的重要指標，也是環(huán)境監(jiān)測水體的重要依據(jù)，在污水處理中我們大家聽到比較多的。</span></p><p><span><br/></span></p><p><span>實際上，COD(化學需氧量)不只單單反應水中有機物，它還能表示水中具有還原性質(zhì)的無機物質(zhì)，如：硫化物、亞鐵離子、亞硫酸鈉等。比如污水中的亞鐵離子在中和池中沒有*去除掉的話，在生化處理出水中，有亞鐵離子存在，出水COD(化學需氧量)可能會超標。</span></p><p><span><br/></span></p><p><span> </span></p><p><span><br/></span></p><p><span>污水中的有機物質(zhì)，有的可以被生物氧化的(如葡萄糖和乙醇)，有的只能部分被生物氧化降解(如甲醇)，還有一部分有機物是不能被生物氧化降解的，并且還有一定的毒性(某些表面活性劑)。這樣，可以把污水中的有機物分成二個部分，可生化降解和不可生化降解的有機物。習慣上，COD(化學需氧量)基本上表示污水中所有的有機物，BOD(生氣需氧量)是污水中可以生物降解的有機物，因此COD與BOD的差值，可表示污水中不能生物降解的有機物。</span></p><p><br/></p><p><br/></p><p>想要了解有關水質(zhì)測定儀請聯(lián)系我們：河南綏凈環(huán)保科技有限公司</p> </div> <div id="trkh4jg" class="ly_PrevNext"> <ul> <li>上一篇：<a href="/Article-2988626.html">污水基本分類的小知識</a></li> <li>下一篇：<a href="/Article-2988616.html">污染指數(shù)那么多，為何選擇了COD</a></li> </ul> </div> </div>   <div id="trkh4jg" class="ly_foot"> <div id="trkh4jg" class="ly_Ftmain"> <div id="trkh4jg" class="ly_FtLeft"> <div id="trkh4jg" class="Ft_nav"><a href="/">首頁</a><a href="/aboutus.html" target="_blank" rel="nofollow">關于我們</a><a href="/products.html" target="_blank">產(chǎn)品展示</a><a href="/news.html" target="_blank">新聞中心</a><a href="/article.html" target="_blank">技術文章</a><a href="/honor.html" target="_blank" rel="nofollow">榮譽資質(zhì)</a></div> <div 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