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style="font-family:宋體">（</span></span><strong><span style="font-size:10.5pt"><span style="font-family:宋體">氨氮分析儀</span></span></strong><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">去除率的影響見(jiàn)圖4</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">25。試驗(yàn)考察了HRT 2.5h和3h條件下的總氮去除率，從結(jié)果可見(jiàn)，在一定范圍內(nèi)水力停留時(shí)間的延長(zhǎng)有利于提高內(nèi)循環(huán)生物流化床總氮的去除，這是由于隨著水力停留時(shí)間的延長(zhǎng)，相應(yīng)的氨氮去除率提高，而較高的氨氮去除效果是實(shí)現(xiàn)理想脫氮的首要條件。然而水力停留時(shí)間的進(jìn)</span></span><span style="font-size:10.5000pt"><span style="font-family:宋體">一</span></span><span style="font-size:10.5000pt"><span style="font-family:宋體">步延長(zhǎng)將對(duì)總氮的去除產(chǎn)生不利的影響，這是由于過(guò)長(zhǎng)的HRT會(huì)導(dǎo)致系統(tǒng)負(fù)荷降低，一方面使系統(tǒng)內(nèi)生物量減少，從而降低處理效果，另方面在相同的曝氣條件下，使系統(tǒng)中DO濃度升高，對(duì)總氮的去除產(chǎn)生影響。本試驗(yàn)后期，HRT 3h</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">進(jìn)水總氮40mg/L，反應(yīng)器對(duì)總氮</span></span><span style="font-size:10.5000pt"><span style="font-family:宋體">（</span></span><strong><span style="font-size:10.5pt"><span style="font-family:宋體">總氮監(jiān)測(cè)儀</span></span></strong><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">的去除率可以達(dá)到50%，出水總氮濃度達(dá)到《城鎮(zhèn)污水處理廠(chǎng)污染物排放標(biāo)準(zhǔn)》(GB</span></span> <span style="font-size:10.5000pt"><span style="font-family:宋體">18918-2002)中規(guī)定的總氮</span></span><span style="font-size:10.5000pt"><span style="font-family:宋體">一</span></span><span style="font-size:10.5000pt"><span style="font-family:宋體">級(jí)B排放標(biāo)準(zhǔn)(20mg/L)。從總氮去除的試驗(yàn)結(jié)果可知，在好氧條件下，內(nèi)循環(huán)生物流化床實(shí)現(xiàn)了同步硝化反硝化。</span></span></p><p><span 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