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id="tq6ztn8r" class="NyNewsdetail_con"> <p><span style="font-size:10.5000pt"><span style="font-family:宋體"> 在</span></span><strong><span style="font-size:10.5pt"><span style="font-family:宋體">污水處理</span></span></strong><span style="font-size:10.5000pt"><span style="font-family:宋體">系統(tǒng)中，曝氣系統(tǒng)能量消耗在整個能源費用中占有相當大的比重。供給充足的氧氣固然能夠保證良好的硝化效果，但這樣不經(jīng)濟。所以了解</span></span><strong><span style="font-size:10.5pt"><span style="font-family:宋體">溶解氧</span></span></strong><span style="font-size:10.5000pt"><span style="font-family:宋體">對硝化的影響十分有意義。試驗階段DO對亞硝化率總體影響見圖4-39(a)?？梢婋S著</span></span><strong><span style="font-size:10.5pt"><span style="font-family:宋體">溶解氧</span></span></strong><span style="font-size:10.5000pt"><span style="font-family:宋體">濃度的降低，亞硝化率為上升的趨勢。試驗還固定</span></span><strong><span style="font-size:10.5pt"><span style="font-family:宋體">pH</span></span></strong><strong><span style="font-size:10.5pt"><span style="font-family:宋體">儀表</span></span></strong><span style="font-size:10.5000pt"><span style="font-family:宋體">值、溫度等其他運行條件，考察了單一DO濃度因素對亞硝化率及氨氮去除率的影響，見圖4-39(b)。</span></span></p><p> <img alt="" src="http://img72.chem17.com/9/20200731/637317838714882560624.png" style="height:554px; width:510px" /></p><p><span style="font-size:10.5000pt"><span style="font-family:宋體"> 硝化系統(tǒng)是一個混合微生物體系，生長著兩類自養(yǎng)細菌，它們雖然利用的營養(yǎng)物質不同，在底物方面不存在競爭，但兩者對氧和生長空間卻要求相似。</span></span><strong><span style="font-size:10.5pt"><span style="font-family:宋體">溶解氧</span></span></strong><span style="font-size:10.5000pt"><span style="font-family:宋體">充足時，兩者的生殖代謝不會受到限制，協(xié)同完成整個硝化過程。當溶解氧低到一定的程度，即溶解氧成為限制基質，由于對氧利用能力不同，兩類硝化細菌之間將會發(fā)生競爭與動力學選擇過程</span></span><span style="font-size:10.5000pt"><span style="font-family:宋體">。</span></span><span style="font-size:10.5000pt"><span style="font-family:宋體">大量的研究結果表明，亞硝化細菌和硝化細菌與溶解氧之間的關系符合Monod方程，</span></span><span style="font-size:10.5000pt"><span style="font-family:宋體">而亞硝</span></span><span style="font-size:10.5000pt"><span style="font-family:宋體">化細蔭的氧飽和常數(shù)低于硝化細菌，這就意味著亞確化細菌對氧的利用率高。從本研究的試驗結果可見，DO濃度過高或過低都不利于系統(tǒng)實現(xiàn)亞硝酸鹽的積累。這是由于過低的DO會導致亞硝化細菌生長和代謝活動變</span></span><span style="font-size:10.5000pt"><span style="font-family:宋體">緩</span></span><span style="font-size:10.5000pt"><span style="font-family:宋體">甚至停止，而過高的DO供應會使硝化細菌大量繁殖。在試驗條件下，由于氧在生物膜中的傳質受限，液相主體DO濃度在2~3mg/L之間，系統(tǒng)有較為穩(wěn)定的亞硝化率。</span></span></p> </div> <div id="tq6ztn8r" class="ly_PrevNext"> <ul> <li>上一篇：<a href="/szhcy-Article-2319392/">反滲透預處理的優(yōu)化設計</a></li> <li>下一篇：<a href="/szhcy-Article-2315058/">污水中污染物可以分哪幾種？</a></li> </ul> </div> </div>   <div id="tq6ztn8r" class="foot_box"> <div id="tq6ztn8r" class="foot_t"> <div id="tq6ztn8r" class="w1200"> <a href="/">網(wǎng)站首頁</a>　|　<a href="/aboutus.html">關于我們</a>　|　<a href="/products.html">產(chǎn)品中心</a>　|　<a href="/news.html">新聞動態(tài)</a>　|　<a href="/article.html">技術文章</a>　|　<a href="/honor.html">榮譽資質</a>　|　<a href="/order.html" target="_blank">在線留言</a>　|　<a 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