排序方式： 共有29条查询结果，搜索用时 15 毫秒
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采用序批式实验,分别以活性污泥和颗粒污泥为吸附材料,考察接触时间、pH等因素对废水中Pb2+生物吸附效果的影响.结果表明,活性污泥和颗粒污泥对低浓度Pb2+(0～20 mg/L)能在30 min内达到吸附平衡,当Pb2+浓度在20～100 mg/L时,浓度越低,达到平衡时间越快,以被动吸附为主.在Pb2+低浓度条件下(0～20 mg/L),初始pH为4～5时,Pb2+的去除率达99%以上,且初始pH值是影响活性污泥和颗粒污泥生物吸附Pb2+的重要因素.活性污泥和颗粒污泥对Pb2+的生物吸附符合朗缪尔(Langmuir)方程,在pH为4及25 ℃下,活性污泥饱和吸附量为59.88 mg/g,颗粒污泥饱和吸附量为80.65 mg/g.因此,活性污泥和颗粒污泥可作为有效的生物吸附剂处理低浓度(0～20 mg/L)含铅废水,且颗粒污泥比活性污泥的生物吸附效果好. 相似文献
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鱼腥藻对某些金属离子的吸附效应研究（Ⅰ） 总被引：2，自引：0，他引：2
初步探讨了鱼腥藻对Mn~(2+)、Co~(2+)、Ni~(2+)、Cu~(2+)、Cd~(2+)和Pb~(2+)的生物吸附特性;研究了金属离子浓度与溶液pH值对吸附行为的影响;展示了某些藻类在分离富集中的应用前景。 相似文献
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利用单因素实验对海洋解木糖赖氨酸芽孢杆菌(Lysinibacillus xylanilyticus sp.JZ008)培养条件进行了优化.优化后的培养条件:温度为35℃、pH值为7.5、接种量为3%(V/V)、装液量为50cm3/250 cm3时,菌量达到2.01×108CFU/cm3,比优化之前提高了40.6%.添加海藻寡糖可以促进菌株生长,添加量为5.0 g/dm3时发酵液中活菌数是对照组的2.51倍.研究了菌株JZ008对Cd~(2+)、Cr~(3+)、Cu~(2+)3种重金属离子的吸附特性,结果表明菌株JZ008对3种重金属离子污染的水溶液吸附率效果明显,20 d吸附率分别达到95.6%、96.4%、87.0%.土壤重金属吸附实验结果表明,海藻寡糖复配菌株JZ008组对Cd~(2+)、Cr~(3+)、Cu~(2+)吸附效果明显,60 d吸附率分别达到82.5%、82.0%、86.9%.菌株JZ008对重金属的优良吸附作用为进一步开发解木糖赖氨酸芽孢杆菌在重金属修复方面的应用奠定了基础. 相似文献
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藻类对重金属污染水体的生物修复 总被引：18，自引：1，他引：18
重金属对水体的污染已成为全球性的环境问题, 利用藻类生物修复重金属污染水体, 因 其有效、低廉和环保引起了国内外的广泛重视, 并且取得了一定的成效。本文介绍了藻类修复重 金属废水的应用概况, 总结了多年来在藻类对重金属离子的吸收途径、耐受机理、生物吸附机制、 模型解释及影响因素等方面的研究成果, 同时指出了当前在这些方面尚存的不足, 并就今后继续 筛选、利用生物技术培育对重金属高耐受、高富集性藻类, 进一步探求修复机理以及野外应用方 面的研究。 相似文献
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四氯乙烯的生物吸附和厌氧生物降解研究 总被引：2，自引：2，他引：0
四氯乙烯(PCE)的广泛使用和不合理的处置已经使其成为地下水中普遍存在的有毒有害的有机污染物。PCE在厌氧条件下通过还原脱氯发生生物降解,按照非水溶性生物降解模型,有机物先吸附到厌氧活性污泥中,解吸后再进行生物降解。利用间歇试验进行厌养污泥对PCE的吸附降解实验研究。试验结果表明：厌氧污泥对PCE的吸附在0.5 h达到吸附平衡,在1.0 h达到解吸平衡。对实验结果的回归分析表明：PCE的吸附和解吸均符合Freundlich等温吸附方程。厌氧污泥在微生物的作用下将PCE还原脱氯为TCE和DCEs。 相似文献
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Discharge of heavy metals from metal processing industries is known to have adverse effects on the environment. Biosorption
of heavy metals by metabolically inactive biomass of microbial organisms is an innovative and alternative technology for removal
of these pollutants from aqueous solution. The search of marine actinobacteria with potential heavy metal biosorption ability
resulted in the identification of a novel alkalophilic Streptomyces VITSVK5 species. The biosorption property of Streptomyces VITSVK5 spp. was investigated by absorbing heavy metals Cadmium (Cd) and Lead (Pb). Physiochemical characteristics and trace
metal concentration analysis of the backwater showed the concentrations of different metals were lead 13±2.1 μg L−1, cadmium 3.1±0.3μg L−1, zinc 8.4±2.6μg L−1 and copper 0.3±0.1μg L−1, whereas mercury was well below the detection limit. The effect of pH and biomass dosage on removal efficiency of heavy metal
ions was also investigated. The optimum pH for maximal biosorption was 4.0 for Cd (II) and 5.0 for Pb (II) with 41% and 84%
biosorption respectively. The biosorbent dosage was optimized as 3 g L-1 for both the trace metals. Fourier transform infrared
absorption spectrum results indicated the chemical interactions of hydrogen atoms in carboxyl (-COOH), hydroxyl (-CHOH) and
amine (-NH2) groups of biomass with the metal ions. This could be mainly involved in the biosorption of Cd (II) and Pb (II) onto Streptomyces VITSVK5 spp. The results of our study revealed Streptomyces metabolites could be used to develop a biosorbent for adsorbing metal ions from aqueous environments. 相似文献
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The thermodynamic process of two macroalgae, Sargassum fusiforme and Lamin aria japonica, absorbing heavy, metal ions Cu^2 , Pb^2 , Cd^2 and Ni^2 . has been studied. The result indicates that the absorption isotherms of these two macroalgae clearly accord with the Landmuir adsorption model. The absorptive processes of S. fusiforme and L. japonica for Cu^2 are endothermal, and at 35℃, the adsorption heat of these two algae is 59.5kJ/mol and 76.8 kJ/mol respectively. Temperature could affect the algae‘s adsorption capacity. Their adsorption capacity increases with temperature (25℃ and 35℃). 相似文献