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Oxygen，簡稱DO)，天然水中的溶解氧含量取決于水體與大氣中氧的平衡。水中溶解氧的飽和含量和空氣中氧的分壓、大氣壓力、水溫、水中含鹽量等有密切關(guān)系。清潔地面水中溶解氧一般接近飽和，20℃清潔水中飽和溶解氧含量約為9mg/L。水體受有機(jī)、無機(jī)還原性物質(zhì)污染，會使溶解氧降低。當(dāng)水中溶解氧低于2mg/L時，水體即產(chǎn)生惡臭。 </span></span></p><p><strong><span style="font-size:10.5pt"><span style="font-family:宋體">溶解氧分析儀</span></span></strong><span style="font-size:10.5000pt"><span style="font-family:宋體">是測定水中溶解氧含量的儀器，根據(jù)不同應(yīng)用場合，測量范圍一般有0~ 20mg/ L或0~20</span></span><span style="font-size:10.5000pt"><span style="font-family:calibri">μ</span></span><span style="font-size:10.5000pt"><span style="font-family:宋體">g/L兩種，后者屬于微量氧分析儀。 </span></span></p><p><strong><span style="font-size:10.5pt"><span style="font-family:宋體">溶解氧分析儀</span></span></strong><span style="font-size:10.5000pt"><span style="font-family:宋體">主要用于下述場合。 </span></span></p><p><strong><span style="font-size:10.5000pt"><span style="font-family:宋體">(1) </span></span></strong><strong><span style="font-size:10.5pt"><span style="font-family:宋體">污水處理工藝</span></span></strong> </p><p><span style="font-size:10.5000pt"><span style="font-family:宋體"> 對于使用活化污泥的生物處理廠來說，測量和控制曝氣池的溶解氧含量到2mg/L十分重要，可以控制空氣的鼓入量或曝氣時間，優(yōu)化生物凈化流程，提高污水處理效率。此外，還需要測量和控制終處理池中和澄清池出水中的氧含量。此時儀器測量范圍選擇0~20mg/ L。</span></span></p><p><span style="font-size:10.5000pt"><span style="font-family:宋體">(2)地表水、生活污水、</span></span><strong><span style="font-size:10.5pt"><span style="font-family:宋體">工業(yè)污水</span></span></strong><span style="font-size:10.5000pt"><span style="font-family:宋體">的水質(zhì)監(jiān)測 </span></span></p><p><span style="font-size:10.5000pt"><span style="font-family:宋體">可以了解地表水是否受到污染，</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">廠的出水是否達(dá)到排放指標(biāo)要求。此時儀器測量范圍選擇0~10mg/L。</span></span></p><p><span style="font-size:10.5000pt"><span style="font-family:宋體">(3)鍋爐給水中的氧含量測量 </span></span></p><p><span style="font-size:10.5000pt"><span style="font-family:宋體">大型鍋爐給水中要求不含氧，水中含有氧時(尤其在高溫和高壓條件下），與鋼材接觸會發(fā)生氧化反應(yīng)，生成疏松多孔的氫氧化鐵沉淀，使鋼鐵腐蝕。為保護(hù)鍋爐設(shè)備免受溶解氧的腐蝕，在鍋爐水的除氧器后面，以及鍋爐給水中都要測量水中的氧含量。此時儀表測量范圍選擇0~20</span></span><span style="font-size:10.5000pt"><span style="font-family:calibri">μ</span></span><span style="font-size:10.5000pt"><span style="font-family:宋體">g/L，控制指標(biāo)為小于7ug/L。 </span></span></p><p><span style="font-size:10.5000pt"><span style="font-family:宋體">(4)用于生物發(fā)酵過程中溶解氧的監(jiān)測 </span></span></p><p><span style="font-size:10.5000pt"><span style="font-family:宋體">可以了解發(fā)酵過程中微生物的生長情況，控制整個發(fā)酵過程，使得微生物發(fā)酵過程的產(chǎn)率提高。 </span></span></p><p><span style="font-size:10.5000pt"><span style="font-family:宋體">(5)用于食品和飲料生產(chǎn)過程中溶解氧的監(jiān)測 </span></span></p><p style="text-align:justify"><span style="font-size:10.5000pt"><span style="font-family:宋體">可以延長食品和飲料的貨架壽命，保證產(chǎn)品的質(zhì)量。 </span></span></p><p style="text-align:justify"><span style="font-family:宋體; font-size:14px">(6)</span><span style="font-size:10.5000pt"><span style="font-family:宋體">養(yǎng)殖業(yè)的水質(zhì)監(jiān)測和控制 </span></span></p><p style="text-align:justify"><span style="font-size:10.5000pt"><span style="font-family:宋體">現(xiàn)代化工廠養(yǎng)殖時，一般多采用密集養(yǎng)殖，養(yǎng)殖水質(zhì)的監(jiān)測和控制直接影響?zhàn)B殖業(yè)的安全和生產(chǎn)成本。其主要控制指標(biāo)是水體的溶解氧含量，可以通過測定溶解氧來控制空氣鼓風(fēng)量加以實現(xiàn)。 </span></span></p><p style="text-align:justify"><strong><span style="font-size:10.5pt"><span style="font-family:宋體">溶解氧分析儀</span></span></strong><span style="font-size:10.5000pt"><span style="font-family:宋體">由傳感器(又稱</span></span><strong><span style="font-size:10.5pt"><span style="font-family:宋體">探頭</span></span></strong><span style="font-size:10.5000pt"><span style="font-family:宋體">)和轉(zhuǎn)換器(又稱變送器)兩部分組成。傳感器有電化學(xué)式(簡稱電極式)和光學(xué)式兩類，目前廣泛采用的是前著。</span></span></p> </div> <div id="qprrcczb" class="ly_PrevNext"> <ul> <li>上一篇：<a href="/szhcy-Article-2000605/">pH計的校準(zhǔn)方法及步驟</a></li> <li>下一篇：<a 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