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</span></p><p><span><br/></span></p><p><span>BOD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(jī)物的生物化學(xué)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(jī)物越多，因此污染也越嚴(yán)重。</span></p><p><span><br/></span></p><p><span>BOD是一種環(huán)境監(jiān)測指標(biāo)，用于監(jiān)測水中有機(jī)物污染情況，有機(jī)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>BOD的測定方法有哪些？</span></p><p><span><br/></span></p><p><span>目前檢測BOD的方法通常有以下幾種：</span></p><p><span><br/></span></p><p><span> 1.1 標(biāo)準(zhǔn)稀釋法</span></p><p><span><br/></span></p><p><span> 將水樣稀釋至一定濃度后,在20℃恒溫下培養(yǎng)5d,測出培養(yǎng)前后水中溶解氧量,便可計(jì)算出BOD值(即BOD5)。該方法1936年被美國公共衛(wèi)生協(xié)會標(biāo)準(zhǔn)方法委員會采用,ISO/TC-147也推薦該法,成為上約定俗成的分析方法。我國頒布的水質(zhì)分析方法GB7488-87亦采用該方法。在水環(huán)境的各類污染物中耗氧污染物仍是當(dāng)前影響水體水質(zhì)的重要因素,其主要危害是消耗水中溶解氧,導(dǎo)致水質(zhì)惡化。BOD能相對表示微生物可分解的有機(jī)物量,即水中有機(jī)物分解時所消耗的溶解氧,符合水體自凈的實(shí)際情況和大部分污水處理技術(shù)工藝路線,因此,BOD的測定對控制水體污染具有更重要的意義。</span></p><p><span><br/></span></p><p><span>目前檢測BOD的方法通常有以下幾種：</span></p><p><br/></p> </div> <div id="3tzm5vv4jmr" class="ly_PrevNext"> <ul> <li>上一篇：<a href="/Article-3096790.html">生活污水氨氮怎么處理</a></li> <li>下一篇：<a href="/Article-3096284.html">為什么總氮測定儀越來越受到大家的歡迎</a></li> </ul> </div> </div>   <div id="3tzm5vv4jmr" class="ly_foot"> <div id="3tzm5vv4jmr" class="ly_Ftmain"> <div id="3tzm5vv4jmr" class="ly_FtLeft"> <div id="3tzm5vv4jmr" class="Ft_nav"><a href="/">首頁</a><a href="/aboutus.html" target="_blank" rel="nofollow">關(guān)于我們</a><a href="/products.html" target="_blank">產(chǎn)品展示</a><a href="/news.html" 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