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class="pager fl"> <div id="rjxnxjz" class="info"> <h3 class="ar_title">給水排水 | 又到了污泥膨脹的季節，怎么辦？</h3> <span>來(lái)源：<a href='http://www.sqhqw.com' target='_blank'>www.sqhqw.com</a> 發(fā)布時(shí)間：2024-03-26</span> <a href="javascript:history.go(-1)" class="back">返回列表</a> </div> <div id="955j9hf" class="ar_con"> <span style="font-size:16px;">最近，有小伙伴反饋，自己的污水處理系統又開(kāi)始出現膨脹了，每年都會(huì )這樣，很有周期性！其實(shí)，很多污水處理系統在溫度高的夏季和寒冷的冬季都不會(huì )出現嚴重的污泥膨脹情況，往往出現在每年的春夏、秋冬換季時(shí)。即發(fā)生在氣溫、水溫和氣壓交變的環(huán)境。<br /> </span> <p> <span style="font-size:16px;"><br /> </span> </p> <p> <span style="font-size:16px;"><br /> </span> </p> <span style="font-size:16px;">在分析一些污水處理廠(chǎng)的統計數據后，發(fā)生泡沫現象的時(shí)期為：由水溫高于氣溫而交變到水溫低于氣溫時(shí)(3月份到4月份)和由水溫低于氣溫而交變到水溫高于氣溫時(shí)(10月份到11月份)。<br /> <br /> <br /> <strong>1、換季膨脹原因分析</strong><br /> <br /> <br /> 由于生態(tài)環(huán)境的更迭，使微生物的生長(cháng)、構成等發(fā)生了變化。從過(guò)去的操作運行發(fā)現，不改變其他條件，泡沫現象在經(jīng)歷一段時(shí)間后(10～20 d)會(huì )逐漸消失，污水處理系統自動(dòng)修復。<br /> <br /> <br /> 通過(guò)鏡檢，發(fā)現春夏交變的泡沫中主要是絲狀菌的暴發(fā)，絲狀菌大量生長(cháng)，并伸展開(kāi)來(lái)；而秋冬交變時(shí)，失去活力的絲狀菌包裹在同樣失去活力的菌膠團中形成上浮泡沫。<br /> </span> <p> <span style="font-size:16px;"></span> </p> <p style="text-align:center;"> <span style="font-size:16px;"><br /> </span> </p> <p style="text-align:center;"> <span style="font-size:16px;"><br /> </span> </p> <p style="text-align:center;"> <span style="font-size:16px;"><img src="https://img01.fuhai360.com/--47/47514/202403/202403271127370662.jpg" alt="" /><br /> </span> </p> <p style="text-align:center;"> <span style="font-size:16px;"><br /> </span> </p> <p style="text-align:center;"> <span style="font-size:16px;"><br /> </span> </p> <p style="text-align:left;"> <span style="font-size:16px;">其原理仍須進(jìn)一步研究，一般認為，當季節(溫度、氣壓)交變時(shí)，微生物均會(huì )受到影響，但絲狀菌的適應性要比一些絮成菌強，如Microthrix parvicella的生長(cháng)溫度可在8～35 ℃間，而且更適宜生長(cháng)在低溫環(huán)境。<br /> <br /> <br /> 當環(huán)境不利于微生物的生長(cháng)時(shí)，絲狀菌的菌絲會(huì )從菌膠團中伸展出來(lái)以增加其攝取營(yíng)養的表面積，其生長(cháng)速率高于其他微生物。<br /> <br /> <br /> 當春夏交變時(shí)，污泥的活性均有下降，生活污水中有大量的合成洗滌劑和油脂類(lèi)得不到降解，而一些絲狀菌仍然活躍，它們喜歡利用這些物質(zhì)作為食物并快速增長(cháng)，這使得出現絲狀菌的暴發(fā)并形成泡沫。<br /> <br /> <br /> 秋冬交變時(shí)，主要形成的是上浮污泥(這與前者不同)，在上浮污泥和泡沫中很難發(fā)現展開(kāi)的絲狀菌，顯微鏡下可見(jiàn)上浮污泥中包裹有細小氣泡。估計這是在環(huán)境交變時(shí)，菌膠團變得分散細小，結合曝氣氣泡后密度減小而產(chǎn)生上浮。<br /> <br /> <br /> <strong>2、換季膨脹控制方法</strong><br /> <br /> <br /> 總結出泡沫形成規律后，對采取控制措施有利，如對于春夏交變時(shí)的泡沫采用機械清理、刮除的方法。因為這些泡沫存在大量絲狀菌，不宜遺留在混合液中，以免重新造成泡沫現象，處置方法如下。而對于秋冬交變時(shí)的上浮污泥和泡沫可采用高壓水槍噴水來(lái)緩解，因為上浮污泥中仍然大部分為絮成菌，被打碎后可以回到混合液中。<br /> <br /> <br /> <strong>1、投加凝聚劑</strong><br /> <br /> <br /> 投加合成的有機聚合物、鐵鹽、鋁鹽等混凝劑均可以通過(guò)其凝聚作用來(lái)提高污泥的壓密性增加污泥的比重；投加高嶺土、碳酸鈣、氫氧化鈣等也可以通過(guò)提高污泥的壓密性來(lái)改善污泥的沉降性能。實(shí)踐證明，不設初沉池的污水廠(chǎng)，其SVI值都比較低，所以設有初沉池的污水廠(chǎng)發(fā)生污泥膨脹時(shí)，將部分污水直接送到曝氣池也是一種控制污泥膨脹的方法。<br /> <br /> <br /> <strong>2、投加Cl2或漂白粉</strong><br /> <br /> <br /> 控制污泥膨脹采用的傳統氧化劑是Cl2。具有氧化能力的Cl2、HOCl和次氯酸根滲入細胞后，能破壞菌體內的酶系統，導致細胞死亡。絕大程度上說(shuō)的絲狀菌都可通過(guò)加氯氣加以控制。<br /> <br /> <br /> 一般投加在回流污泥中，投加量至關(guān)重要，投加過(guò)量很可能將正常菌膠團全部殺滅，而投加過(guò)少很可能沒(méi)有起到任何作用，反而使生化系統出水出現惡化。通過(guò)不同比例投加后對活性污泥的抑制情況來(lái)確認最佳投加漂白粉量，主要通過(guò)顯微鏡觀(guān)察原后生動(dòng)物的活性和存在數量，以及絲狀菌的受損程度來(lái)確認。當SVI值逐漸降低、膨脹不斷緩解時(shí)，應逐漸減少投藥量。<br /> <br /> <br /> <strong>3、引入惰性物質(zhì)抑制絲狀菌膨脹</strong><br /> <br /> <br /> 我們在實(shí)踐中發(fā)現，高度和極度膨脹的絲狀菌，通過(guò)簡(jiǎn)單的方法很難有效阻止，但可以投加惰性物質(zhì)來(lái)抑制絲狀菌的膨脹。足量的惰性物質(zhì)流入生化系統，強化活性污泥的相對沉降性能的同時(shí)，還對絲狀菌的結構起到了破壞作用，降低其膨脹程度，繁殖速度也會(huì )降低。因此，通過(guò)引入惰性物質(zhì)，對絲狀菌的抑制作用是明顯的。<br /> <br /> <br /> <strong>4、調整pH值抑制絲狀菌膨脹</strong><br /> <br /> <br /> 運用高ph值得廢水來(lái)抑制絲狀菌膨脹，因為絲狀菌的比表面及比菌膠團大，在理論上，絲狀菌應對急性環(huán)境惡變的能力總體而言低于菌膠團，特別是耐受高ph值和對活性污泥有抑制作用的有毒物質(zhì)，但運用這個(gè)方法pH控制范圍很重要，根據經(jīng)驗，在曝氣池整池，pH控制在10左右，持續4-8h能夠對絲狀菌起到明顯的殺滅作用，pH過(guò)高對活性污泥有影響，pH太低效果不好。<br /> <br /> <br /> <br /> <br /> 來(lái)源：環(huán)保工程師<br /> <br /> </span> </p> </div> <div id="f95tx99" class="record"> <span id="fvjbpd9" class="prevrecord">上一條：<a href="/content/336.html"> 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