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class="article-title"> <h1>震惊!污泥堆肥土地利用重金属去哪儿？</h1> </div> <div class="entry-meta"> <span class="">发布日期：2018-01-17 15:52:15</span> <span class="marL20">发布人：scmeiwen</span> <span class="marL20"> 浏览量：0</span> </div> <div class="article-content"> (1)污泥堆肥中有机物和铁水合氧化物的含量均明显高于土壤，有利于重金属固定;与此同时，污泥堆肥中各种重金属总量均高于对照土壤，土地利用会增加土壤中重金属总量。污泥堆肥和土壤中重金属赋存的化学形态基本一致，Cr、Cu和Cd主要吸附在固体有机物表面，Ni和Pb主要吸附在固体有机物和铁铝氧化物表面，As主要吸附在铁铝氧化物表面，同时易与钙离子和磷酸根形成共沉淀。<br /> <br /> (2)pH、有机物组成含量变化、氧化还原条件改变是影响污泥堆肥中重金属释放的主要因素。碱性条件下颗粒态有机物向溶解性有机物转化，重金属与溶解性有机物络合，释放能力增强。<br /> <br /> (3)旱田的氧化性条件促进了溶解性有机碳的降解，强化了Cd和Cu在颗粒态有机碳上的吸附固定。水田的还原性条件下，Fe(III)被还原为Fe(II)，铁的水合氧化物含量降低，对As的吸附能力减弱。<br /> <br /> (4)污泥堆肥的多次施用增加了土壤有机质含量，提升了微生物活性对土壤中氧气的消耗能力，强化了还原性条件的形成。在还原性条件下，As的浸出浓度上升约1个数量级，累积释放量可达到总量的15.7%，因此在降雨丰富及连续灌溉等易形成还原性条件的土壤环境中，不宜施用富含As的污泥堆肥。对于有机质含量低的土壤，污泥堆肥多次施用可增强有机质对重金属Cd、Cu、Pb的吸附固定。<br /> <br /> (5)污泥堆肥的3年田间施用显著提升了污泥堆肥施用层(0~10 cm)土壤中溶解性有机质、腐殖酸、铁水合氧化物含量，有机物含量的上升及其在碱性条件的溶解，导致重金属在偏碱性环境中释放能力显著高于对照土壤。污泥堆肥的施用对小麦及水稻中重金属含量无显著影响。表层0~10 cm土壤对重金属的阻滞固定能力强，10~20 cm的土壤中重金属含量及释放特性未受到污泥堆肥施用的影响。<br /> </div>   <div id="ckepop"> <span class="jiathis_txt">分享到：</span> <a class="jiathis_button_tqq">腾讯</a> <a class="jiathis_button_tsina">新浪</a> <a class="jiathis_button_renren">人人网</a> <a class="jiathis_button_email">邮件</a> <a class="jiathis_button_fav">收藏夹</a> <a class="jiathis_button_copy">复制网址</a> <a class="jiathis jiathis_txt jiathis_separator jtico jtico_jiathis" target="_blank">更多</a> <a class="jiathis_counter_style"></a> </div>  <script type="text/javascript">var jiathis_config={data_track_clickback:true};</script> <script type="text/javascript" src="http://v2.jiathis.com/code/jia.js?uid=1336353133859589" charset="utf-8"></script>  </div> <div class="pad10">  <p class="prev">上一篇：没有了</p> <p class="next">下一篇：<a href="/news/show-133.html">每文环保在中国成都环保产业博览会等您~！</a></p>  </div> </div> </div> </div> </div> </div>   <div class="marT20" style="background-color:#e5e5e5"> <div class="center-block"> <div class="row"> <div class="span6"> <div class="pad20"> 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