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發(fā)布日期：<span>2016-10-31 16:01</span> 來源：<span>http://www.28fashion.com</span> 點擊：<span><script src="http://www.28fashion.com/data/include/newshits.php?id=372"></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"><form id="form1" method="post" action="index.aspx?nodeid=67&page=ContentPage&contentid=87803"><div id="jlrjvtnppp" class="family w1002 clearfix"><div id="jlrjvtnppp" class="sideL fl"><div id="jlrjvtnppp" class="edits"><p><span style="font-size: 16px;">今天繼續(xù)向大家介紹土壤鉛污染的生物修復(fù)方法，生物修復(fù)主要分為微生物修復(fù)法和植物修復(fù)法。</span></p><p><br/></p><p><span style="font-size: 16px;">　　<span style="font-size: 16px; color: rgb(255, 0, 0);">9、微生物修復(fù)法</span></span></p><p><br/></p><p><span style="font-size: 16px;">　　利用微生物(細菌、藻類和酵母)來減輕或消除重金屬污染，國內(nèi)外已有許多相關(guān)報道。鉛污染土壤的微生物修復(fù)是利用微生物對鉛的吸附、沉淀、氧化和還原等作用，降低土壤中鉛的毒性。鉛污染土壤中存在大量適應(yīng)于此污染環(huán)境的優(yōu)勢微生物群落，根據(jù)自身的新陳代謝作用不斷改變土壤環(huán)境。Macaskie L.E發(fā)現(xiàn)，Citrobacter sp.產(chǎn)生的酶能使鉛和鎘形成難溶性磷酸鹽。L.L.Barton等人發(fā)現(xiàn)，從含鉛、六價鉻和鋅的土壤中分離的菌種Pseudomonas能夠?qū)⒍r鉛還原為不具毒性的膠態(tài)鉛。微生物不能降解和破壞重金屬鉛，只能通過改變它們的化學(xué)或物理特性從而影響其在環(huán)境中的遷移和轉(zhuǎn)化。因此微生物處理重金屬鉛污染方面的發(fā)展有限，通常與植物修復(fù)技術(shù)聯(lián)用[27]。首先通過植物與微生物抗性細菌的篩選，得到具有耐重金屬鉛的植物物種與微生物抗性細菌菌種，然后將該耐性植物的種子在微生物抗性細菌菌液中浸泡、包衣，最后將該種子種植于鉛污染土壤中。此方法修復(fù)效果好，費用低、易于管理與操作，不產(chǎn)生二次污染，具有廣泛的應(yīng)用前景。</span></p><p><br/></p><p><span style="font-size: 16px;">　　<span style="font-size: 16px; color: rgb(255, 0, 0);">10、植物修復(fù)法</span></span></p><p><br/></p><p><span style="font-size: 16px;">　　植物修復(fù)主要是利用超富集植物，將土壤中的鉛大量轉(zhuǎn)移至植株體內(nèi)特別是地上部分，從而修復(fù)鉛污染土壤。根據(jù)其作用過程和機理，可分為植物穩(wěn)定、植物提取和植物揮發(fā)三種方法。植物修復(fù)技術(shù)的難點在于超富集植物的篩選。20世紀70年代以后，有關(guān)重金屬超富集植物的研究逐漸受到重視。重金屬的超富集植物應(yīng)同時具備以下3個基本特征: (1)植物地上部分富集重金屬的量要達到一定的臨界標準，在較低污染水平下也有較高的吸收速率;(2)地上部分重金屬含量高于地下部分的重金屬含量，即植物應(yīng)有較強的轉(zhuǎn)運能力;(3)生長快、生物量大、抗蟲病能力強、植物生長未出現(xiàn)明顯的毒害癥狀。一般認為，只有植物地上部分的鉛積累量達到1000mg/kg才能稱之為鉛的超富集植物。自然界中大多數(shù)植物對鉛的吸收能力很低，普通植物一般含鉛量為10mg/kg干重。目前，已發(fā)現(xiàn)的鉛超富集植物并不多，國內(nèi)外已見報道的鉛超富集植物有Brassica.nigua、Brassica1pekinensis、Brassica.juncea、T. rotungifol-ium、密毛白蓮蒿、蓖麻、短萼灰葉等。植物修復(fù)技術(shù)的優(yōu)點主要表現(xiàn)為: (1)修復(fù)成本較低，修復(fù)費用為200~10000$ /hm2，比物理化學(xué)修復(fù)技術(shù)的費用低幾個數(shù)量級[36]，此外植物冶金回收的重金屬可以創(chuàng)造一定的經(jīng)濟效益;(2)以太陽能為驅(qū)動能，是一種綠色修復(fù)技術(shù)，且植物修復(fù)屬于原位修復(fù)，對環(huán)境擾動較小，避免了土壤結(jié)構(gòu)的破壞;(3)提高土壤有機質(zhì)含量，增加土壤肥力，有利于植物生長。同時，植物修復(fù)技術(shù)也存在一定的局限性，如超富集植物種類較少、對重金屬復(fù)合污染的修復(fù)具有單一選擇性、植物地上部分枯萎重新進入土壤等。</span></p></div></div></div></form><form id="form1" method="post" action="index.aspx?nodeid=67&page=ContentPage&contentid=87803"><div id="jlrjvtnppp" class="family w1002 clearfix"><div id="jlrjvtnppp" class="sideL fl"><div id="jlrjvtnppp" class="articleInfo cleargap"><span style="font-size: 12px;">來源：土壤地下水修復(fù)</span></div></div></div></form><p><br/></p></div> <h3 class="tag">相關(guān)標簽：<a href="http://www.28fashion.com/tag/%E5%99%AA%E5%A3%B0%E9%98%B2%E6%B2%BB%E8%AE%BE%E5%A4%87">噪聲防治設(shè)備</a> </h3> <div id="jlrjvtnppp" class="page">上一篇：<a href="http://www.28fashion.com/news/367.html">小城鎮(zhèn)污水處理存在的問題及對策</a><br />下一篇：<span><a href="http://www.28fashion.com/news/396.html">排污許可正式來襲監(jiān)測行業(yè)的機會在哪里?</a></span></div> </div> <div id="jlrjvtnppp" class="relateproduct relate"><h4>最近瀏覽：</h4> <div id="jlrjvtnppp" class="content"> <ul id="relate_n" class="news_list clearfix"> </ul> </div> </div>  <div id="jlrjvtnppp" class="relate_list"> <div id="jlrjvtnppp" class="relateproduct relate"><h4>相關(guān)產(chǎn)品：</h4> <div id="jlrjvtnppp" class="content"> 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