共查询到19条相似文献,搜索用时 281 毫秒
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随着我国工业的发展,废水排放量增加,其中重金属污染已成为一个亟待解决的问题。对传统的处理废水重金属的方法如反渗透法、离子交换法进行了回顾,对各自的优缺点与操作条件进行了比较,综述近年来采用这些方法所取得的成就。着重介绍了新兴的生物方法包括活性污泥法、生物膜法处理废水中重金属的作用机制、操作优点及其应用前景。最后得出,虽然传统的物理化学方法已被广泛使用,但由于各有利弊,需要进一步改进,才能更好的应用于大规模生产。相比之下,大规模应用活性污泥及生物滤器从废水中回收有毒重金属将有极好的应用前景。 相似文献
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通过活性污泥2号模型(ASM2)对城市污水处理厂接纳初期雨水处理效果进行模拟分析,探讨城市污水处理厂处理初期雨水的可行性。模拟结果表明城市污水处理厂具备接纳初期雨水进行处理的能力,且适当增加池容可有效提高接纳初期雨水后的处理效果。 相似文献
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大孔离子交换树脂在废水处理终端中应用探讨 总被引:5,自引:0,他引:5
本文介绍了目前国内外先进的两种废水处理组合工艺,即金属氢氧化物沉淀-离子交换法和活性炭-离子交换法,用于重金属废水和城市污水处理厂排水的深度处理,离子交换法作为低浓度废水的终端处理,越来越显示它的优越性。 相似文献
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重金属离子对A~2/O工艺脱氮效能的毒性影响分析 总被引:1,自引:0,他引:1
以浙江某城市污水处理厂重金属离子引起出水水质恶化为研究对象,分析了城市污水厂处理厂进水、出水、活性污泥中Mn2+、Ni2+、Cr6+、Cu2+、Zn2+等重金属离子的含量。结果表明,进水、出水、活性污泥(干泥)中Mn2+含量分别为0.476 5~8.248 7 mg/L、0.472 7~4.630 5 mg/L、1 582.2 mg/kg干泥,Mn2+是影响该污水处理厂水质净化效果主要原因。通过采取控制进水水质、加大活性污泥排放量、接种污泥等措施,最后恢复了该厂的正常运行。 相似文献
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Jianlong Wang Yuanling Zhao Pingping Zhang Liqiong Yang Huai'ao Xu Guangpeng Xi 《中国化学工程学报》2018,26(1):96-103
Urban sediments have rapidly increased in recent years around the world,and their effective management has become an important problem.To remove heavy metals from stormwater runoff and use sediments as a resource,a novel ceramsite was developed using sewer pipe sediments(SPS),river bed sediments(RBS),urban water supply treatment sludge(WSTS),and wastewater treatment plant excess sludge(WWTS).The optimal composition was determined based on the Brunauer–Emmett–Teller specific surface area and an orthogonal test design.The adsorption characteristics of the novel ceramsite for dissolved heavy metals(Cu~(2+)and Cd~(2+)) were investigated through adsorption isotherms and kinetic experiments at(25±1)℃.Both Cu~(2+) and Cd~(2+) were effectively removed by the novel ceramsite,and their equilibrium adsorption was 4.96 mg·g~(-1) and 3.84 mg·g~(-1),respectively.Langmuir isotherms and a pseudo-first-order kinetic equation described the adsorption process better than other techniques.Characterization analysis of the ceramsite composition before and after heavy metal adsorption showed that the Cu~(2+) and Cd~(2+) contents in the ceramsite increased after adsorption.The results revealed that adsorption is both a physical and chemical process,and that ceramsite can be used as a bioretention medium to remove heavy metals from stormwater runoff while simultaneously converting problematic urban sediments into a resource. 相似文献
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结合含氰、含铬、酸洗电镀废水的特点,采用氧化法破氰;6价铬还原,碱性沉淀后,加入重金属捕集剂反应,再利用铁碳还原法进一步降低废水中的重金属含量,达到深度去除重金属的目的;采用接触氧化法降解污水中的有机污染物,各级沉淀池的污泥通过静水压定期排入集泥池,然后通过机械压滤后作无害化处理.运行结果表明,该工艺处理效果稳定可靠,... 相似文献
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硫酸盐生物还原和重金属的去除 总被引:6,自引:0,他引:6
重金属废水的排放带来了长期的环境污染。利用硫酸盐还原菌生物还原硫酸盐的过程中同时可将重金属化学沉淀为难溶金属硫化物而去除。文章对硫酸盐生物还原法去除重金属的原理、特点、影响因素和研究现状进行了阐述.从而说明该法去除重金属是可行和有效的,它对于处理重金属废水具有现实意义。 相似文献
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《分离科学与技术》2012,47(6):920-932
In this work an ultrafiltration (UF) membrane system was investigated for the treatment of textile wastewater. UF membranes were assisted by activated sludge and minerals, which were employed as sorbents, to remove Cu(II), Pb(II), Zn(II), Ni(II), color, and organics. Significant variations were observed in metal removal efficiencies among the textile wastewater samples of different origin, even at the same pH (= 6) due to the presence of different compounds in wastewater. At the examined pH range (5.63–9.21), the dominant mechanism for copper and lead removal was the formation of insoluble metals due to precipitation and complexation of metal ions with wastewater compounds, including adsorption of metals on suspended solids and colloidal matter. The adsorption process of metals on minerals and activated sludge was the dominant process for nickel and zinc removal at low pH, while precipitation/complexation prevailed at higher pH. The examined adsorption-UF system could produce a treated effluent having low metal concentrations that could be safely discharged into municipal sewers. COD removal ranged from 76%–92% for the five textile wastewater samples. The color removal accomplished was significant (45%–70%), and depended on the type of dye. 相似文献
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Donald B. Aulenbach Michael A. Meyer Eileen Beckwith Shrikant Joshi Chittibabu Vasudevan Nicholas L. Clesceri 《Chemical Engineering Communications》1987,60(1):79-99
Studies were conducted to determine the removal of heavy metals in three normally operating activated sludge wastewater treatment plants having only moderate industrial inputs. The removals of the soluble and particulate fractions varied with primary and secondary treatment, and in one instance a tertiary sand filter. 相似文献
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城市污水处理厂污泥产生量大,含有丰富的有机质、氮、磷、钾等农作物所需营养物质,但由于受重金属的污染使污泥无法直接农用。本文简述了城市污泥重金属的来源、特点及危害。重点论述了城市污泥中重金属去除和稳定方法,包括化学法(电化学法、化学试剂法)、生物法(微生物法、植物法、低等动物法)、物理法(超临界流体萃取、微波和超声)及联合技术。分析了各种方法处理污泥重金属过程中重金属的形态变化及其对处理效果的影响,对比各种方法的优缺点、影响因素及适用范围。指出污泥中重金属形态分布是影响去除效果的关键因素,污泥中重金属形态分布差异性大,且大部分重金属以稳定或相对稳定的状态存在,导致物理法和生物法去除效率较低,微生物和低等动物处理法相比植物法(备受时空限制)则表现出更好的适应性;电化学法对可氧化、可还原态分布的重金属都能起到较好的转化去除作用,但往往受由污泥向污泥液相中转移过程的控制,电损耗较突出;化学试剂浸提剂是目前效率较高的方法,但强酸环境常导致污泥营养物质流失和酸根离子累积,农用时容易板结而不利于污泥土地利用。因此,以土地利用为前提的条件下,将各种处理技术联合运用以提高污泥重金属去除率有待于进一步研究。 相似文献