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791.
以拜耳法生产氧化铝产生的赤泥为捕集剂,对CO2进行捕集,考察了液固比、反应温度、搅拌速率、CO2流量对单位CO2捕集量(以每克赤泥捕集的CO2质量计)和赤泥脱碱率(以钠去除率计)的影响。实验结果表明:在液固比为7#x02236;1、反应温度为30℃、搅拌转速为500r/min、CO2流量为200mL/min的最佳实验条件下,最大单位CO2捕集量为0.0263g/g,赤泥的脱碱率可达到42.43%。赤泥具有较强的捕集CO2的能力,因此,利用固体废弃物赤泥吸收工业废气中的CO2可以达到以废治废的目的。 相似文献
792.
793.
不同焚烧温度下开发区污泥焚烧渣分析 总被引:4,自引:1,他引:3
在不同焚烧温度条件下采用可控温管式炉焚烧开发区干污泥,对污泥焚烧渣中微观形貌、元素分布、矿物组成以及重金属总量及其形态进行了分析研究。实验结果表明,污泥焚烧渣在焚烧温度为900℃出现明显的结焦现象,在焚烧温度为1 100℃时焚烧渣结焦的微观表面致密。XRD分析发现温度的升高使污泥烧渣中出现NaA lS iO4等性质相当稳定的物质。不同重金属在底渣中的总量分布及其形态特征受焚烧温度的影响程度不同。焚烧温度的提高使污泥中重金属的残渣态比例增高,使污泥焚烧对环境的影响减小。 相似文献
794.
考察了pH值对“Fe^0一厌氧微生物”体系降解2,4,6,一三氯酚(2,4,6.TCP)效果的影响,结果表明:pH值是影响“Fe^0-厌氧微生物”体系降解2,4,6-TCP效果的重要参数,初始pH值直接影响微生物活性和铁腐蚀,进而影响过程pH值变化,反过来又影响铁腐蚀和微生物活性,pH7.0~9.0的中性偏碱范围较适于厌氧微生物生长。Fe^0与微生物对目标污染物的降解具有协同促进作用,其协同促进机制表现在3方面:Fe^0与微生物对体系过程pH值具有互补调节作用,可将体系的pH值调节值适于微生物生长的中性范围;Fe^0腐蚀产生的Fe2+和H2可为微生物代谢提供电子对和营养物质,从而促进生物还原脱氯的进行;Fe^0的腐蚀过程直接对氯代有机物还原脱氯,而微生物又可促进Fe^0腐蚀。 相似文献
795.
为研究石煤提钒离交尾水的深度处理技术,利用质量分数为1%、5%和10%的过氧化氢溶液对ZWY15型活性炭进行改性,得到3种改性活性炭即1%AC、5%AC和10%AC;探讨其对该废水中低浓度的NH3-N、V等的吸附效果。实验结果表明:AC或改性AC的加入可使废水的碱度升高,随着吸附时间及吸附剂投加量的增加,升高幅度增大,且不同改性AC对废水碱度提高的幅度不同;相较于未改性活性炭,过氧化氢改性活性炭对V的吸附效果明显提高,去除率最大可提高30%,对NH3-N的去除率提升约11%;当投加量为60 g/L时,10%AC可使废水中V的浓度降低至1.88 mg/L,此时废水中Cr、Cd和Zn的浓度分别降低至0.006、0.010和0.036 mg/L,均低于《钒工业污染物排放标准》(GB26452-2011)所规定的排放限值。 相似文献
796.
Zhihui Dai Xinbin Feng Chao Zhang Jingfu Wang Taiming Jiang Houjun Xiao Yu Li Xun Wang Guangle Qiu 《Environmental science and pollution research international》2013,20(11):7560-7569
Long-term mining and smelting activities brought a series of environmental issues into soils in Wanshan mercury (Hg) mining area (WMMA), Guizhou, China. Several studies have been published on the concentrations of Hg in local soils, but a comprehensive assessment of the mass of Hg in soil induced by anthropogenic activities, as presented in this paper, has not been previously conducted. Three districts of WMMA were chosen as the study areas. We summarized previous published data and sampled 14 typical soil profiles to analyze the spatial and vertical distributions of Hg in soil in the study areas. The regional geologic background, direct and indirect Hg deposition, and Hg-polluted irrigation water were considered as the main sources of Hg contaminations in local soils. Furthermore, the enrichment factor (EF) method was applied to assess the extent of anthropogenic input of Hg to soil. Titanium (Ti) was chosen to be the reference element to calculate the EF. Generally, the elevated values of EF were observed in the upper soil layers and close to mine wastes. The total budget of Hg in soil contributed from anthropogenic sources was estimated to be 1,227 t in arable soil and 75 t in natural soil. Our data showed that arable soil was the major sink of anthropogenic Hg in the study area. 相似文献
797.
Wu Y Wen Y Zhou J Dai Q Wu Y 《Environmental science and pollution research international》2012,19(8):3371-3379
Purpose
The potential of using waste Saccharomyces cerevisiae as adsorbent for the adsorption of As(III) from aqueous solution was assessed.Methods
The biosorbent was characterized by Fourier transform infrared (FTIR) spectroscopy analysis. Various parameters including pH, biosorbent dosage, contact time, and temperature were systematically investigated.Results and conclusions
The FTIR results of S. cerevisiae biomass showed that biomass has different functional groups, and these functional groups are able to react with metal ion in aqueous solution. Several biosorption isotherms were used to fit the equilibrium data, showing sorption to be monolayer on the heterogeneous surface of the biosorbent. The maximum biosorption capacity calculated using Langmuir model was found to be 62.908???g/g at pH?5.0, biosorbent dosage 5?g/L, contact time 240?min, and temperature 35?°C. The kinetic studies indicated that the biosorption process of the As(III) followed well the pseudo-second-order equation. The intraparticle diffusion and Richenberg models were applied to the data, and we found that the biosorption of As(III) was governed by film diffusion followed by intraparticle diffusion. The thermodynamics constants indicated that the biosorption of As(III) onto S. cerevisiae was spontaneous and endothermic under examined conditions. Biosorbent could be regenerated using 0.5?M NaOH solution, with up to 75?% recovery. 相似文献798.
Selective removal of diclofenac from contaminated water using molecularly imprinted polymer microspheres 总被引:1,自引:0,他引:1
Dai CM Geissen SU Zhang YL Zhang YJ Zhou XF 《Environmental pollution (Barking, Essex : 1987)》2011,159(6):1660-1666
A molecularly imprinted polymer (MIP) was synthesized by precipitation polymerization using diclofenac (DFC) as a template. Binding characteristics of the MIP were evaluated using equilibrium binding experiments. Compared to the non-imprinted polymer (NIP), the MIP showed an outstanding affinity towards DFC in an aqueous solution with a binding site capacity (Qmax) of 324.8 mg/g and a dissociation constant (Kd) of 3.99 mg/L. The feasibility of removing DFC from natural water by the MIP was demonstrated by using river water spiked with DFC. Effects of pH and humic acid on the selectivity and adsorption capacity of MIP were evaluated in detail. MIP had better selectivity and higher adsorption efficiency for DFC as compared to that of powdered activated carbon (PAC). In addition, MIP reusability was demonstrated for at least 12 repeated cycles without significant loss in performance, which is a definite advantage over single-use activated carbon. 相似文献
799.
800.