共查询到17条相似文献,搜索用时 109 毫秒
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凝胶吸附技术用于污泥中重金属去除较传统技术具有成本低、效率高的优势,介绍了凝胶吸附技术的原理、目前国内外相关研究进展情况、国内污泥处理重金属现状以及需要解决的技术问题;通过中试案例的运行效果分析,得出结论:凝胶吸附除重技术已经部分具备工业化应用的技术可行性。 相似文献
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污泥中重金属的稳定化研究进展与去除方法简述 总被引:1,自引:0,他引:1
通过"十一五"污水处理厂的建设,我国污泥产量也随之大幅增长,污泥的处理处置已经成为制约社会经济发展的重要问题。国际上的经验表明土地利用是污泥最终处置的主要发展方向,然而污泥中的重金属成为其土地利用的主要障碍。越来越多的研究者意识到,重金属的环境危害不仅仅取决于其总量,更取决于重金属存在形态。目前,Tessier分步提取法作为主流的污泥重金属划分方法,取得了广泛应用,该法将污泥中的重金属分成5种形态,分别为可交换态、碳酸盐结合态、铁锰氧化物结合态、有机结合态和残渣态。本文以此为基础综述了目前国内外主要的污泥重金属稳定和去除方法的原理及研究进展,比较了不同重金属稳定及去除方法的优点与不足,并提出了新的展望。 相似文献
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我国城镇污泥营养成分与重金属含量分析 总被引:1,自引:0,他引:1
我国城镇污水处理厂的污泥中含有大量营养成分,同时也含有重金属成分,对于污泥中营养成分和重金属的含量情况,汇总并分析了国内90个污水处理厂的污泥泥质数据后,得出结论:总体上城镇污水处理厂的污泥泥质是适合土地利用的,重金属风险由大到小排序为:Hg、Ni、Cd、Zn、Cu、Cr、Pb、As、B;建议在开展污泥土地利用工作的同时,应探索创新排水管理模式、污泥中重金属去除技术,以及土地利用模式。 相似文献
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阐述了生物沥浸处理技术的基本原理、工艺流程及主要技术特点,通过典型应用工程实例表明,采用生物沥浸预处理方法不但可大幅度提高污泥脱水性能,而且可去除污泥中的重金属、恶臭,杀灭病原物,脱水后的污泥水分含量很低(60%以下),无臭、卫生、无害,可广泛应用于城镇污水处理厂及工业行业的污泥处理,市场前景十分广阔。 相似文献
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城市污水污泥资源化利用研究 总被引:1,自引:0,他引:1
为确定城市污水的污泥在农用过程中是否存在重金属毒害,文章系统研究了西宁城市污水的污泥中重金属特征。研究表明:①西宁城市污水的污泥中重金属含量较我国其他城市略低;②EDTA(乙二胺四乙酸)提取污泥时,重金属的提取率在18%-55%,这部分重金属有可能被植物吸收。③污泥中所含的有机质、氮、磷、钾微量元素及土壤改良剂(有机腐殖质)等成分可以改善土壤结构,提高土壤的肥力。 相似文献
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利用城市污水厂剩余污泥制备生物炭吸附镉 总被引:2,自引:0,他引:2
利用城市污水厂剩余污泥制备生物炭并用于吸附重金属离子Cd2+,有利于城市污水厂污泥的处置,为污水中重金属的处理与处置和“碳减排”提供新的思路与方法。研究结果表明不同污水厂的污泥的最佳活化温度不同,昆明第一污水处理厂污泥最佳活化温度为300℃,第三、第五污水处理厂污泥为400℃;对于污水厂污泥制备的生物炭对镉的吸附量随着pH值的升高而增加;吸附模型拟和结果表明Freundllch模型在大部分温度下均具有比Iangrmuir模型有更好的相关性。 相似文献
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超声波去除农用污泥中重金属的试验研究 总被引:1,自引:0,他引:1
污水处理厂污泥中的重金属浓度高是污泥农用的主要障碍。为了降低农用污泥中的重金属含量,以Cu、Zn、Ni、Pb为对象,研究了超声波对其的影响。结果表明:超声对污泥中重金属有一定的溶出作用。当超声时间为30min时,溶解状态Cu、Zn、Ni、Pb的析出率分别为42.1%、37.5%、12.7%、14.7%;总的析出率分别为52.7%、44.7%、23.6%、71%。其中析出的Pb大部分以胶体状态存在,而溶解状态只占很少一部分。其他几种金属则以溶解状态为主。 相似文献
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生物沥滤污泥重金属污染的潜在生物毒性评价 总被引:1,自引:0,他引:1
采用沉积物质量基准法(SQGs)和Hakanson指数法对沥滤前后城市污泥中重金属的潜在生物毒性进行了定性和定量的评价,结果表明氧化亚铁硫杆菌(A.ferrooxidans菌)对Cu、Cd的脱毒作用优于氧化硫硫杆菌(A.thiooxidans菌)。沥滤后污泥的综合潜在生态危害指数均能下降91.0%以上,且A.ferrooxidans菌沥后污泥的潜在生物毒性最弱,其综合潜在生态危害指数为84.75,是生物沥滤去除城市污泥重金属工程应用的适合菌种。 相似文献
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Toxic metals removal from wastewater sewage sludge can be achieved through microbial processes involving Acidithiobacillus ferrooxidans. The oxidation of ferrous ions by A. ferrooxidans, cultured in sewage sludge filtrate, was studied in both batch and continuous flow stirred tank reactors. Sewage sludge filtrate containing natural nutrients (phosphorus and nitrogen) was recovered as effluent following the dehydration of a primary and secondary sludge mixture. Batch and continuous flow stirred tank reactor tests demonstrated that A. ferrooxidans were able to grow and completely oxidize ferrous iron in a culture medium containing more than 80% (v v(-1)) sewage sludge filtrate with 10 g Fe(II) L(-1) added. Toxic levels were reached when total organic carbon in the sewage sludge filtrate exceeded 250 mg L(-1). The ferric iron solution produced in the sludge filtrate by A. ferrooxidans was used to solubilize heavy metals in primary and secondary sludge. The solubilization of Cu, Cr, and Zn yielded 71, 49, and 80%, respectively. This is comparable with the yield percentages obtained using a FeCl(3) solution. The cost of treating wastewater sewage sludge by bioproducing a ferric ion solution from sewage sludge is three times less expensive than the conventional method requiring a commercial ferric chloride solution. 相似文献
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Mohammad Khan Jamali Tasneem Gul Kazi Mohammad Bilal Arain Hassan Imran Afridi Nusrat Jalbani Jameel A. Baig Abdul Niaz 《The Environmentalist》2008,28(4):366-375
The recycling of sewage sludge on agriculture land represents an alternative, advantageous, disposal of this waste material.
The aim of the present study was to evaluate the feasibility of using industrial sewage sludge, produced in Pakistan, as a
fertiliser. Agricultural soil amended with 25% (w/w) sewage sludge with or without lime treatment was used for growing a variety
of sorghum (PARC-SS-1). The mobility of the heavy metals (HMs) (Cd, Cu, Cr, Ni, Pb and Zn) and metalloid (As) in the untreated
industrial waste water sewage sludge (UIWS) samples were assessed by applying a modified BCR (Community Bureau of Reference)
sequential extraction procedure. The single extraction procedure comprised of the application of mild extractant (CaCl2) and water for the estimation of the proportion of easily soluble metal fractions. The precision and accuracy of BCR was
evaluated by using a certified reference material of soil amended with sewage sludge BCR 483. The plant available metal contents,
as extracted by the deionised water and 0.01 M CaCl2 solution and exchangeable fraction of BCR sequential, decreased with lime application in the range of 10–44% for As, Cr,
Ni, Pb and Zn, except in the cases of Cd and Cu, where their mobility was increased by 10% and 24%, respectively. Sludge amendment
enhanced the dry weight yield of sorghum and the increase was more obvious after liming up to 25%. The uptake of HMs were
lower in test samples (3.2–21.8%), except for Cu and Cd, which was higher (4%), while they were below the permissible limit
of these metals. The present experiment demonstrates that liming was important in factors facilitating the growth of sorghum
in sludge-amended soil. 相似文献