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src="Template/Free001/Images/bdhny.jpg" border="0" align="absmiddle" /> </div> <div class="rvxbxbp" id="nrr"><div align="center"></div><div id="dfvzxdj" class="nbj"><h1><span><b></b>行業(yè)資訊</span><em><a href='index.html'>網(wǎng)站首頁(yè)</a> > <a href='list.asp?cid=12&tp=Free001'>新聞動(dòng)態(tài)</a> > <a href='list.asp?Cid=20&tp=Free001'>行業(yè)資訊</a></em> <div id="fhtvjvj" class="clear"></div></h1> <p><div class="lfnlnlf" id="newsview" class=" clearfix"> <div class="hbpvfln" id="fontsizer"></div> <h2>廢水處理分為幾級？每一級的任務(wù)是什么？</h2> <div class="bpvlhpz" id="newsview_cs">作者：admin　　來(lái)源：admin　　更新時(shí)間：2018-08-30　　閱讀數：594 </div> <div class="prftpxb" id="content">按處理程度，廢水處理（首要是城市生活污水和某些工業(yè)廢水）一般可分為三級。<br /> <p> 　　一級處理的使命是從廢水中去除呈懸浮狀況的固體污染物。為此，多選用物理處理法。一般經(jīng)過(guò)一級處理后，懸浮固體的去除率為70％～80％，而生化需氧量（ BOD）的去除率只要25％～40％左右，廢水的凈化程度不高。 </p> <p> <img src="UpLoadFile/image/smallpic/廢水處理工程 (8).jpg" width="400" alt="廣東環(huán)保工程公司" /> </p> 　　二級處理的使命是大幅度地去除廢水中的有機污染物，以 BOD 為例，一般經(jīng)過(guò) 二級處理后，廢水中的 BOD可<br /> 　　去除80％～90％，如城市污水處理后水中的 BOD含量可低于30毫克／升。需氧生物處理法的各種處理單元大多可以到達這種要求。<br /> 　　三級處理的使命是進(jìn)一步去除二級處理未能去除的污染物，其間包含微生物未能降解的有機物、磷、氮和可溶性無(wú)機物。<br /> 　　三級處理是高檔處理的同義語(yǔ)，但兩者又不完全一致。三級處理是經(jīng)二級處理后，為了從廢水中去除某種特定的污染物，如磷、氮等，而補充添加的一項或幾項處理單元；高檔處理則往往是以廢水收回、復用為意圖，在二級處理后所增設的處理單元或體系。三級處理耗資較大，辦理也較復雜，但能充分利用水資源。有少數國家建成了一些污水三級處理廠(chǎng)。<br /> 　　重金屬廢水首要來(lái)自礦山、鍛煉、電解、電鍍、農藥、醫藥、油漆、顏料等企業(yè)排出的廢水。假如不對重金屬廢水處理，就會(huì )嚴重污染環(huán)境。廢水處理中重金屬的品種、含量及存在形狀隨不同出產(chǎn)企業(yè)而異。除重金屬在廢水處理中顯得很重要。<br /> 　　因為重金屬不能分解損壞，而只能搬運它們的存在方位和改變它們的物理和化學(xué)形狀，到達除重金屬的意圖。例如，廢水處理過(guò)程中，經(jīng)化學(xué)沉積處理后，廢水中的重金屬從溶解的離子形狀改變成難溶性化臺物而沉積下來(lái)，從水中搬運到污泥中；經(jīng)離子交換處理后，廢水中的重金屬離子搬運到離子交換樹(shù)脂上，經(jīng)再生后又從離子交換樹(shù)脂上搬運到再生廢液中。<br /> 　　因此，廢水處理除重金屬準則是：<br /> 　　除重金屬準則一：最底子的是變革出產(chǎn)工藝。不必或少用毒性大的重金屬；<br /> 　　除重金屬準則二：是選用合理的工藝流程、科學(xué)的辦理和操作，削減重金屬用量和隨廢水流失量，盡量削減外排廢水量。重金屬廢水處理應當在發(fā)生地點(diǎn)就地處理，不同其他廢水混合，避免使處理復雜化。更不應當不經(jīng)除重金屬處理直接排入城市下水道，避免擴展重金屬污染。<br /> 文章來(lái)源：廣東環(huán)保工程公司 <a href="../" 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