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<li><a href="/about.html"> <div class="pic"><img src="/static/index/images/aside01.png" alt=""/></div> <div class="bt">關于正澤</div> </a></li> <li><a href="/contact.html#message"> <div class="pic"><img src="/static/index/images/aside03.png" alt=""/></div> <div class="bt">在線定制</div> </a></li> </ul> </div> </div> <div class="inmain-right"> <div class="inside-news-show clearfix" style="padding-top:0;"> <h1>A2/O工藝的脫氮除磷分析</h1> <p class="info">文章來源：正澤上傳時間：2022-03-05</p> <div class="txtbox cleafix" style="width:100%;float:none;"> <div microsoft="" style="margin: 0px; padding: 0px; color: rgb(102, 102, 102); font-family: " ui="" yahei=""> <div style="margin: 0px; padding: 0px; text-align: center;"><span style="font-size:14px; margin:0px; padding:0px"><img alt="" src="http://m.bz543.com/uploads/allimg/190222/1-1Z222112R2310.jpg" style="border:0px none; margin:0px; padding:0px; vertical-align:middle" /></span><br style="margin: 0px; padding: 0px;" /> </div> <div style="margin: 0px; padding: 0px;"><span style="font-size:14px; margin:0px; padding:0px">A2/O工藝是厭氧-缺氧-好氧生物脫氮除磷工藝的簡稱，一般適用于要求脫氮除磷的大中型城市污水廠。下面，我們通過A2/O工藝的脫氮除磷分析，來具體了解下該工藝。</span></div> <div style="margin: 0px; padding: 0px;"> </div> <div style="margin: 0px; padding: 0px;"><span style="font-size:14px; margin:0px; padding:0px">南方某城市污水處理廠采用的多點進水的改良A2/O工藝，下面對該工程的運行進行探討，以期獲得此類污水處理廠的管理經驗。該污水處理廠一期規模200,000t/d，工程于2004年正式運行。由于廠外配套管網尚未完善，目前該廠的處理量只有100,000t/d。該廠自運行以來，取得了較好的脫氮除磷效果。</span></div> <div style="margin: 0px; padding: 0px;"> </div> <div style="margin: 0px; padding: 0px;"><strong style="font-weight:bold !important; margin:0px; padding:0px"><span style="font-size:14px; margin:0px; padding:0px">1. 工藝流程</span></strong></div> <div style="margin: 0px; padding: 0px;"> </div> <div style="margin: 0px; padding: 0px;"><span style="font-size:14px; margin:0px; padding:0px">該工藝流程如圖1所示。</span><br style="margin: 0px; padding: 0px;" /> </div> <div style="margin: 0px; padding: 0px; text-align: center;"><span style="font-size:14px; margin:0px; padding:0px"><img 100="" alt="" src="http://m.bz543.com/uploads/allimg/190222/1-1Z22211291O04.jpg" style="border:0px none; margin:0px; padding:0px; vertical-align:middle;width:100%" /></span><br style="margin: 0px; padding: 0px;" /> </div> <span style="font-size:14px; margin:0px; padding:0px"><strong style="font-weight:bold !important; margin:0px; padding:0px">2. 主要處理構筑物及設備</strong></span></div> <div microsoft="" style="margin: 0px; padding: 0px; color: rgb(102, 102, 102); font-family: " ui="" yahei=""> </div> <div microsoft="" style="margin: 0px; padding: 0px; color: rgb(102, 102, 102); font-family: " ui="" yahei=""><span style="font-size:14px; margin:0px; padding:0px">主要處理構筑物及設備如表1所示。其中生化池的預缺氧段、厭氧段、缺氧段和好氧段的容積分別為：1,420m3、5,760m3、7,180m3和34,580m3，各段的平面布置如圖2所示。</span><br style="margin: 0px; padding: 0px;" /> </div> <div microsoft="" style="margin: 0px; padding: 0px; color: rgb(102, 102, 102); font-family: " ui="" yahei=""><span style="font-size:14px; margin:0px; padding:0px"><img alt="" src="http://m.bz543.com/uploads/allimg/190222/1-1Z222112941496.jpg" style="border:0px none; margin:0px; padding:0px; vertical-align:middle" /><br style="margin: 0px; padding: 0px;" /> <img alt="" src="http://m.bz543.com/uploads/allimg/190222/1-1Z222113000121.jpg" style="border:0px none; margin:0px; padding:0px; vertical-align:middle" /></span><br style="margin: 0px; padding: 0px;" /> </div> <div microsoft="" style="margin: 0px; padding: 0px; color: rgb(102, 102, 102); font-family: " ui="" yahei=""><strong style="font-weight:bold !important; margin:0px; padding:0px"><span style="font-size:14px; margin:0px; padding:0px">3. 運行效果</span></strong></div> <div microsoft="" style="margin: 0px; padding: 0px; color: rgb(102, 102, 102); font-family: " ui="" yahei=""> </div> <div microsoft="" style="margin: 0px; padding: 0px; color: rgb(102, 102, 102); font-family: " ui="" yahei=""><span style="font-size:14px; margin:0px; padding:0px">該廠2004年開始正式運行，至今運行正常。其中，2005年1月份進水水質較差，故以該月的運行結果來考察其運行效果。該月運行結果與設計進出水水質如表2所示，由此表可知，2005年1月份進水BOD5、TN和NH4+-N均超出設計值，但仍取得較好的處理效果，出水各項指標均達到設計要求，尤其總磷的去除率達84.04％，說明多點進水的改良A2/0工藝強化了除磷，除磷脫氮效果較好。</span><br style="margin: 0px; padding: 0px;" /> </div> <div microsoft="" style="margin: 0px; padding: 0px; color: rgb(102, 102, 102); font-family: " ui="" yahei=""><span style="font-size:14px; margin:0px; padding:0px"><img alt="" src="http://m.bz543.com/uploads/allimg/190222/1-1Z2221130343O.jpg" style="border:0px none; margin:0px; padding:0px; vertical-align:middle" /></span><br style="margin: 0px; padding: 0px;" /> </div> <div microsoft="" style="margin: 0px; padding: 0px; color: rgb(102, 102, 102); font-family: " ui="" yahei=""><strong style="font-weight:bold !important; margin:0px; padding:0px"><span style="font-size:14px; margin:0px; padding:0px">4. 主要運行參數的調控</span></strong></div> <div microsoft="" style="margin: 0px; padding: 0px; color: rgb(102, 102, 102); font-family: " ui="" yahei=""> </div> <div microsoft="" style="margin: 0px; padding: 0px; color: rgb(102, 102, 102); font-family: " ui="" yahei=""><span style="font-size:14px; margin:0px; padding:0px">要獲得良好的脫氮除磷效果，關鍵是對工藝中生化池各脫氮除磷反應單元的氧環境控制得當，以滿足脫氮與除磷分別要求的缺氧/好氧和厭氧/好氧狀態，還需要對工藝的其他主要運行參數進行控制，以取得較好的運行效果。</span></div> <div microsoft="" style="margin: 0px; padding: 0px; color: rgb(102, 102, 102); font-family: " ui="" yahei=""> </div> <div microsoft="" style="margin: 0px; padding: 0px; color: rgb(102, 102, 102); font-family: " ui="" yahei=""><strong style="font-weight:bold !important; margin:0px; padding:0px"><span style="font-size:14px; margin:0px; padding:0px">(1)溶解氧</span></strong></div> <div microsoft="" style="margin: 0px; padding: 0px; color: rgb(102, 102, 102); font-family: " ui="" yahei=""> </div> <div microsoft="" style="margin: 0px; padding: 0px; color: rgb(102, 102, 102); font-family: " ui="" yahei=""><span style="font-size:14px; margin:0px; padding:0px">改良A2/O工藝生化池中各脫氮除磷的反應單元的溶解氧控制是工藝控制的難點。</span></div> <div microsoft="" style="margin: 0px; padding: 0px; color: rgb(102, 102, 102); font-family: " ui="" yahei=""> </div> <div microsoft="" style="margin: 0px; padding: 0px; color: rgb(102, 102, 102); font-family: " ui="" yahei=""><span style="font-size:14px; margin:0px; padding:0px">首先，預缺氧段的溶解氧控制與好氧2段的溶解氧控制存在矛盾。</span></div> <div microsoft="" style="margin: 0px; padding: 0px; color: rgb(102, 102, 102); font-family: " ui="" yahei=""> </div> <div microsoft="" style="margin: 0px; padding: 0px; color: rgb(102, 102, 102); font-family: " ui="" yahei=""><span style="font-size:14px; margin:0px; padding:0px">為保證好氧段的硝化效果和為聚磷菌提供一個有氧環境以利于聚磷菌超量吸收磷，同時也使混合液進入二次沉淀池后不會因為缺氧反硝化而導致污泥上浮，一般好氧2段的DO要求在2.0mg/L以上。</span></div> <div microsoft="" style="margin: 0px; padding: 0px; color: rgb(102, 102, 102); font-family: " ui="" yahei=""> </div> <div microsoft="" style="margin: 0px; padding: 0px; color: rgb(102, 102, 102); font-family: " ui="" yahei=""><span style="font-size:14px; margin:0px; padding:0px">但是，富含溶解氧的污泥從二次沉淀池回流至預缺氧段后會提高預缺氧段的溶解氧，抑制了預缺氧段的反硝化反應，當混合液進入后續的厭氧段時，帶入的硝酸鹽和溶解氧破壞厭氧段的厭氧環境，影響聚磷菌對磷的釋放，不利于除磷。</span></div> <div microsoft="" style="margin: 0px; padding: 0px; color: rgb(102, 102, 102); font-family: " ui="" yahei=""> </div> <div microsoft="" style="margin: 0px; padding: 0px; color: rgb(102, 102, 102); font-family: " ui="" yahei=""><span style="font-size:14px; margin:0px; padding:0px">其次，好氧2段的溶解氧控制和缺氧1段的溶解氧控制存在矛盾。</span></div> <div microsoft="" style="margin: 0px; padding: 0px; color: rgb(102, 102, 102); font-family: " ui="" yahei=""> </div> <div microsoft="" style="margin: 0px; padding: 0px; color: rgb(102, 102, 102); font-family: " ui="" yahei=""><span style="font-size:14px; margin:0px; padding:0px">為了降低出水氨氮，需加大內回流比，但這樣將使好氧2段中的溶解氧過多地帶入缺氧1段，從而影響了缺氧段的反硝化反應。在工藝運行管理中，解決生化池預缺氧段與好氧2段溶解氧控制矛盾的措施是延長預缺氧段的水力停留時間。在運行中發現，預缺氧段中的溶解氧和停留時間相關，溶解氧隨著停留時間延長而降低。因而通過調節進入預缺氧段的原污水的比例，使預缺氧段的原污水進水比例從設計的15％降至11%左右，就可以延長預缺氧段的水力停留時間，從而降低溶解氧濃度。</span></div> <div microsoft="" style="margin: 0px; padding: 0px; color: rgb(102, 102, 102); font-family: " ui="" yahei=""> </div> <div microsoft="" style="margin: 0px; padding: 0px; color: rgb(102, 102, 102); font-family: " ui="" yahei=""><span style="font-size:14px; margin:0px; padding:0px">同樣，厭氧段的原污水進水比例也從設計的70％降至67％左右。而缺氧1段的進水量提高至22％左右，污泥回流比保持不變，此時，關閉缺氧2段與好氧1段交接處的2根供氣支管，用以增大缺氧段容積。</span></div> <div microsoft="" style="margin: 0px; padding: 0px; color: rgb(102, 102, 102); font-family: " ui="" yahei=""> </div> <div microsoft="" style="margin: 0px; padding: 0px; color: rgb(102, 102, 102); font-family: " ui="" yahei=""><span style="font-size:14px; margin:0px; padding:0px">為了解決好氧2段與缺氧1段溶解氧控制的矛盾，在運行中采取在好氧2段中內回流水池附近實行遞減供氧的措施，以減少回流水池內的溶解氧。在運行管理中摸索得到的較好的溶解氧調控范圍為：預缺氧段、厭氧段和缺氧段宜在0.2mg/L以下；好氧2段控制在1.0mg/L以上，好氧1段控制在2.0mg/L以上。</span></div> <div microsoft="" style="margin: 0px; padding: 0px; color: rgb(102, 102, 102); font-family: " ui="" yahei=""> </div> <div microsoft="" style="margin: 0px; padding: 0px; color: rgb(102, 102, 102); font-family: " ui="" yahei=""><strong style="font-weight:bold !important; margin:0px; padding:0px"><span style="font-size:14px; margin:0px; padding:0px">(2) BOD5污泥負荷</span></strong></div> <div microsoft="" style="margin: 0px; padding: 0px; color: rgb(102, 102, 102); font-family: " ui="" yahei=""> </div> <div microsoft="" style="margin: 0px; padding: 0px; color: rgb(102, 102, 102); font-family: " ui="" yahei=""><span style="font-size:14px; margin:0px; padding:0px">生物除磷屬高污泥負荷（F/M）、低污泥齡。這是因為磷的去除是通過排泥完成的。F/M較高時，SRT較小，剩余污泥排放量較多，因而在污泥含磷量一定的條件下，除磷量也較多。而生物硝化屬于低負荷工藝。負荷越低，硝化反應就進行得越充分，NH4+-N向NO3--N轉化的效率就越高。生物硝化是生物反硝化的前提，只有良好的硝化才能獲得高效而穩定的反硝化。也就是說，生物脫氮屬低污泥負荷系統。同步生物脫氮與除磷工藝所要求的污泥負荷存在矛盾。但脫氮除磷工藝可以以脫氮為重點，也可以以除磷為重點，當然也可以兩者兼顧。在兩者兼顧時，F/M一般應控制在0.1～0.15kgBOD/(kgMLVSS·d）。</span></div> <div microsoft="" style="margin: 0px; padding: 0px; color: rgb(102, 102, 102); font-family: " ui="" yahei=""> </div> <div microsoft="" style="margin: 0px; padding: 0px; color: rgb(102, 102, 102); font-family: " ui="" yahei=""><span style="font-size:14px; margin:0px; padding:0px">該污水廠采用的改良A2/0工藝，污泥負荷（F/M）的較好運行范圍與上述一致。當污泥負荷處在0.17～0.26kgBOD5/(kgMLVSS·d）時，就必須控制好溶解氧和污泥齡。在該范圍內污泥負荷越高，所需要的氧供應速率也就越高，目的是為了避免微生物在降解大量的有機物時好氧池中的溶解氧驟降而影響硝化反應以及聚磷菌的吸磷；同時，在該污泥負荷范圍內，要控制得當的污泥齡，理論上高污泥負荷需要較短的污泥齡，以排放較多的剩余污泥量，從而獲得較高的除磷量，但也可以適當延長污泥齡，以通過減少排泥提高曝氣池中的污泥濃度，降低污泥負荷。當污泥負荷在0.17～0.26kgBOD5/(kgMLVSS·d)時，好氧2段溶解氧最好控制在1.0mg/L以上，污泥齡至少大于7d。</span></div> <div microsoft="" style="margin: 0px; padding: 0px; color: rgb(102, 102, 102); font-family: " ui="" yahei=""> </div> <div microsoft="" style="margin: 0px; padding: 0px; color: rgb(102, 102, 102); font-family: " ui="" yahei=""><strong style="font-weight:bold !important; margin:0px; padding:0px"><span style="font-size:14px; margin:0px; padding:0px">(3) 污泥齡</span></strong></div> <div microsoft="" style="margin: 0px; padding: 0px; color: rgb(102, 102, 102); font-family: " ui="" yahei=""> </div> <div microsoft="" style="margin: 0px; padding: 0px; color: rgb(102, 102, 102); font-family: " ui="" yahei=""><span style="font-size:14px; margin:0px; padding:0px">生物除磷需要短的污泥齡，但不能太短。而生物脫氮需要長的污泥齡。同步生物脫氮除磷工藝當以除磷為重點時，污泥齡一般控制在7～10d，當以脫氮為重點時，污泥齡一般控制在至少8d以上，若兩者兼顧，污泥齡一般控制在8～12d。該污水廠的改良A2/O工藝運行的較好的污泥齡范圍為6～12d。如果污泥齡處在13～15d且運行效果不好，就該注意污泥負荷和溶解氧的控制。若是負荷過高而影響了處理效果，則不能通過減少排泥來增長污泥齡以降低污泥負荷，因為13～15d的污泥齡已經偏長且不在污泥最佳的范圍，此時，需對供氧速率進行調控。</span></div> <div microsoft="" style="margin: 0px; padding: 0px; color: rgb(102, 102, 102); font-family: " ui="" yahei=""> </div> <div microsoft="" style="margin: 0px; padding: 0px; color: rgb(102, 102, 102); font-family: " ui="" yahei=""><strong style="font-weight:bold !important; margin:0px; padding:0px"><span style="font-size:14px; margin:0px; padding:0px">(4) 內回流比與外回流比</span></strong></div> <div microsoft="" style="margin: 0px; padding: 0px; color: rgb(102, 102, 102); font-family: " ui="" yahei=""> </div> <div microsoft="" style="margin: 0px; padding: 0px; color: rgb(102, 102, 102); font-family: " ui="" yahei=""><span style="font-size:14px; margin:0px; padding:0px">內回流比與脫氮效率有關。內回流比越大，回流至缺氧段的硝酸鹽越多，系統總的脫氮效率就越高，出水TN就越低。但從另一方面來看，內回流比太高，通過內回流自好氧段的混合液帶至缺氧段的溶解氧就多，造成缺氧段溶解氧升高，影響反硝化反應的進行，對脫氮不利。此外，內回流比高，回流泵的能耗也大。理論上內回流比一般在200％～500％之間。該污水廠的運行內回流比采用200％，此時已達到設計所要求的脫氮效率。</span></div> <div microsoft="" style="margin: 0px; padding: 0px; color: rgb(102, 102, 102); font-family: " ui="" yahei=""> </div> <div microsoft="" style="margin: 0px; padding: 0px; color: rgb(102, 102, 102); font-family: " ui="" yahei=""><span style="font-size:14px; margin:0px; padding:0px">外回流的污泥回流至預缺氧段，回流污泥維持著生化反應池各段的污泥濃度，從而保證生化反應的順利進行。當好氧池中溶解氧不富裕時，如果外回流比R太小，會使活性污泥在二次沉淀池中的停留時間增長，容易導致二次沉淀池內反硝化引起污泥上浮或聚磷菌在二次沉淀池內遇到厭氧環境引起磷的二次釋放；相反，當好氧池中溶解氧充足時，如果外回流比R太大時，一方面回流污泥中攜帶的溶解氧增多，影響了預缺氧段和厭氧段的氧環境；另一方面，較大的外回流比縮短了污泥在厭氧段的實際停留時間，從而影響厭氧段中聚磷菌對磷的釋放。該污水A2/O工藝運行外回流比調控范圍在45％～50％之間。</span></div> <div microsoft="" style="margin: 0px; padding: 0px; color: rgb(102, 102, 102); font-family: " ui="" yahei=""> </div> <div microsoft="" style="margin: 0px; padding: 0px; color: rgb(102, 102, 102); font-family: " ui="" yahei=""><span style="font-size:14px; margin:0px; padding:0px">我們在分析了A2/O工藝的脫氮除磷后，知道A2/O工藝可以同時完成有機物的去除、硝化脫氮、磷的去除等功能。在實踐中遇到該工藝，還需要進行具體問題具體分析，在整體上把握才能有的放矢。</span></div> <div microsoft="" style="margin: 0px; padding: 0px; color: rgb(102, 102, 102); font-family: " ui="" yahei=""> </div> <div microsoft="" style="margin: 0px; padding: 0px; color: rgb(102, 102, 102); font-family: " ui="" yahei=""> <div microsoft="" style="margin: 0px; padding: 0px; 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