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href="http://www.28fashion.com/news/">新聞資訊</a> >> <a href="http://www.28fashion.com/news/xydt/">行業(yè)動(dòng)態(tài)</a> </div> </div> <div id="jlrjvtnppp" class="content">  <div id="jlrjvtnppp" class="news_detail"> <h1 class="title">中和沉淀法與硫化物沉淀法對(duì)廢水治理的意義表現(xiàn)</h1> <div id="jlrjvtnppp" class="info_title clearfix"> <h3 class="title_bar"> 發(fā)布日期：<span>2019-01-14 16:12</span> 來(lái)源：<span>http://www.28fashion.com</span> 點(diǎn)擊：<span><script src="http://www.28fashion.com/data/include/newshits.php?id=604"></script></span> </h3> <div id="jlrjvtnppp" class="share">  <div id="jlrjvtnppp" class="bdsharebuttonbox"> <a href="#" class="bds_more" data-cmd="more"></a> <a href="#" class="bds_qzone" data-cmd="qzone"></a> <a href="#" class="bds_tsina" data-cmd="tsina"></a> <a href="#" class="bds_tqq" data-cmd="tqq"></a> <a href="#" class="bds_renren" data-cmd="renren"></a> <a href="#" class="bds_weixin" data-cmd="weixin"></a> </div> <script> window._bd_share_config={"common":{"bdSnsKey":{},"bdText":"","bdMini":"2","bdPic":"","bdStyle":"0","bdSize":"16"},"share":{},"image":{"viewList":["qzone","tsina","tqq","renren","weixin"],"viewText":"分享到：","viewSize":"16"},"selectShare":{"bdContainerClass":null,"bdSelectMiniList":["qzone","tsina","tqq","renren","weixin"]}};with(document)0[(getElementsByTagName('head')[0]||body).appendChild(createElement('script')).src='http://bdimg.share.baidu.com/static/api/js/share.js?v=89860593.js?cdnversion='+~(-new Date()/36e5)]; </script>  </div> </div> <div id="jlrjvtnppp" class="content"><p><span style="font-family: 微軟雅黑, 'Microsoft YaHei'; font-size: 14px;">電鍍重金屬?gòu)U水治理技術(shù)說明</span><br/></p><p><br/></p><p><span style="font-family: 微軟雅黑, 'Microsoft YaHei'; font-size: 14px;">中和沉淀法</span></p><p><span style="font-family: 微軟雅黑, 'Microsoft YaHei'; font-size: 14px;">　　在含重金屬的廢水中加入堿進(jìn)行中和反應(yīng)，使重金屬生成不溶于水的氫氧化物沉淀形式加以分離。中和沉淀法操作簡(jiǎn)單，是常用的處理廢水方法。實(shí)踐證明在操作中需要注意以下幾點(diǎn)：(1)中和沉淀后，廢水中若pH值高，需要中和處理后才可排放;(2)廢水中常常有多種重金屬共存，當(dāng)廢水中含有Zn、Pb、Sn、Al等兩性金屬時(shí)，pH值偏高，可能有再溶解傾向，因此要嚴(yán)格控制pH值，實(shí)行分段沉淀;(3)廢水中有些陰離子如：鹵素、氰根、腐植質(zhì)等有可能與重金屬形成絡(luò)合物，因此要在中和之前需經(jīng)過預(yù)處理;(4)有些顆粒小，不易沉淀，則需加入絮凝劑輔助沉淀生成。</span></p><p><br/></p><p><span style="font-family: 微軟雅黑, 'Microsoft YaHei'; font-size: 14px;">硫化物沉淀法</span></p><p><span style="font-family: 微軟雅黑, 'Microsoft YaHei'; font-size: 14px;">　　</span></p><p><span style="font-family: 微軟雅黑, 'Microsoft YaHei'; font-size: 14px;">加入硫化物沉淀劑使廢水中重金屬離子生成硫化物沉淀除去的方法。與中和沉淀法相比，硫化物沉淀法的優(yōu)點(diǎn)是：重金屬硫化物溶解度比其氫氧化物的溶解度更低，而且反應(yīng)的pH值在7—9之間，處理后的廢水一般不用中和。硫化物沉淀法的缺點(diǎn)是[2]：硫化物沉淀物顆粒小，易形成膠體;硫化物沉淀劑本身在水中殘留，遇酸生成硫化氫氣體，產(chǎn)生二次污染。為了防止二次污染問題，英國(guó)學(xué)者研究出了改進(jìn)的硫化物沉淀法，即在需處理的廢水中有選擇性的加入硫化物離子和另一重金屬離子(該重金屬的硫化物離子平衡濃度比需要除去的重金屬污染物質(zhì)的硫化物的平衡濃度高)。由于加進(jìn)去的重金屬的硫化物比廢水中的重金屬的硫化物更易溶解，這樣廢水中原有的重金屬離子就比添加進(jìn)去的重金屬離子先分離出來(lái)，同時(shí)防止有害氣體硫化氫生成和硫化物離子殘留問題。</span></p><p><br/></p><p><br/></p><p><br/></p><p><br/></p><p><br/></p></div> <h3 class="tag">相關(guān)標(biāo)簽：<a href="http://www.28fashion.com/tag/%E9%87%8D%E5%BA%86%E5%BA%9F%E6%B0%B4%E6%B2%BB%E7%90%86">重慶廢水治理</a> </h3> <div id="jlrjvtnppp" class="page">上一篇：<a href="http://www.28fashion.com/news/603.html">污水處理法可分為物理處理法、化學(xué)處理法和生物處理法三類</a><br />下一篇：<span><a href="http://www.28fashion.com/news/605.html">工業(yè)園區(qū)的廢水治理重點(diǎn)都表現(xiàn)在哪些方面呢？</a></span></div> </div> <div id="jlrjvtnppp" class="relateproduct relate"><h4>最近瀏覽：</h4> <div id="jlrjvtnppp" class="content"> 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