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41.
N. DANESHVAR D. SALARI A. NIAEI A. R. KHATAEE 《Journal of environmental science and health. Part. B》2013,48(8):1273-1290
The present work mainly deals with photocatalytic degradation of a herbicide, erioglaucine, in water in the presence of TiO2 nanoparticles (Degussa P-25) under ultraviolet (UV) light illumination (30 W). The degradation rate of erioglaucine was not so high when the photolysis was carried out in the absence of TiO2 and it was negligible in the absence of UV light. We have studied the influence of the basic photocatalytic parameters such as pH of the solution, amount of TiO2, irradiation time and initial concentration of erioglaucine on the photodegradation efficiency of erioglaucine. A kinetic model is applied for the photocatalytic oxidation by the UV/TiO2 system. Experimental results indicated that the photocatalytic degradation process could be explained in terms of the Langmuir–Hinshelwood kinetic model. The values of the adsorption equilibrium constant, K, and the second order kinetic rate constant, k, were 0.116 ppm? 1 and 0.984 ppm min? 1, respectively. In this work, we also compared the reactivity between the commercial TiO2 Degussa P-25 and a rutile TiO2. The photocatalytic activities of both photocatalysts were tested using the herbicide solution. We have noticed that photodegradation efficiency was different between both of them. The higher photoactivity of Degussa P-25 compared to that of rutile TiO2 for the photodegradation of erioglaucine may be due to higher hydroxyl content, higher surface area, nano-size and crystallinity of the Degussa P-25. Our results also showed that the UV/TiO2 process with Degussa P-25 as photocatalyst was appropriate as the effective treatment method for removal of erioglaucine from a real wastewater. The electrical energy consumption per order of magnitude for photocatalytic degradation of erioglaucine was lower with Degussa P-25 than in the presence of rutile TiO2. 相似文献
42.
Dissolved organic matter removal using magnetic anion exchange resin treatment on biological effluent of textile dyeing wastewater 总被引:3,自引:0,他引:3
This study investigated the removal of dissolved organic matter(DOM) from real dyeing bio-treatment effluents(DBEs) with the use of a novel magnetic anion exchange resin(NDMP).DOMs in two typical DBEs were fractionized using DAX-8/XAD-4 resin and ultrafiltration membranes. The hydrophilic fractions and the low molecular weight(MW)(〈3 kDa) DOM fractions constituted a major portion(〉50%) of DOMs for the two effluents. The hydrophilic and low MW fractions of both effluents were the greatest contributors of specific UV254absorbance(SUVA254),and the SUVA254 of DOM fractions decreased with hydrophobicity and MW. Two DBEs exhibited acute and chronic biotoxicities. Both acute and chronic toxicities of DOM fractions increased linearly with the increase of SUVA254 value. Kinetics of dissolved organic carbon(DOC) removal via NDMP treatment was performed by comparing it with that of particle active carbon(PAC). Results indicated that the removal of DOC from DBEs via NDMP was 60%,whereas DOC removals by PAC were lower than 15%. Acidic organics could be significantly removed with the use of NDMP. DOM with large MW in DBE could be removed significantly by using the same means. Removal efficiency of NDMP for DOM decreased with the decrease of MW. Compared with PAC,NDMP could significantly reduce the acute and chronic bio-toxicities of DBEs. NaCl/NaOH mixture regenerants,with selected concentrations of 10% NaCl(m/m)/1%NaOH(m/m),could improve desorption efficiency. 相似文献
43.
朱庚申 《中国环境管理干部学院学报》1999,(1)
农业可持续发展是国家可持续发展的根本保证和优先领域,实现农业可持续发展必须建立可持续农业。本文认为,高科技生态农业是中国可持续农业的唯一战略选择和最终出路。为实现这一战略选择,在继续贯彻实施计划生育和环境保护两个基本国策的同时,必须调整现有的农业结构和资源管理模式,制定可持续利用的资源管理政策,发展以生态农业为基础、以高新农业技术为手段的高科技生态农业。 相似文献
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46.
稠油采出水回用热采锅炉供水的处理工艺设计 总被引:3,自引:0,他引:3
运用混凝沉降、溶气浮选、粗精过滤和弱酸软化方法对稠油采出水进行深度处理。可达到热采锅炉用水指标 ,回用热采锅炉供水 ;生产装置产生的污水、污油、污泥均回收利用。笔者总结了流程选择、工艺配置、新工艺的采用、工艺及自控设计特点 ,为今后污水处理设计提供借鉴。 相似文献
47.
高级氧化技术( AOP)是一种新兴的氧化处理技术,而羟基自由基(·OH)是高级氧化技术中一种重要的中间体,具有很强的氧化能力,是一种高效环保的氧化剂,近年将其用于烟气中有害气体氧化脱除的技术方法多有研究。列举了羟基自由基的检测方法,包括:电子自旋捕集法( ESR)、高效液相色谱法( HPLC)、分光光度法、荧光光度法( FD)等方法,这些方法对科研工作者检测羟基自由基提供了一定的技术支持,并对今后的研究方向起到一定的指导作用。 相似文献
48.
Shane Morrin Paola Lettieri Chris Chapman Richard Taylor 《Waste management (New York, N.Y.)》2014,34(1):28-35
Often perceived as a Cinderella material, there is growing appreciation for solid waste as a renewable content thermal process feed. Nonetheless, research on solid waste gasification and sulphur mechanisms in particular is lacking. This paper presents results from two related experiments on a novel two stage gasification process, at demonstration scale, using a sulphur-enriched wood pellet feed.Notable SO2 and relatively low COS levels (before gas cleaning) were interesting features of the trials, and not normally expected under reducing gasification conditions. Analysis suggests that localised oxygen rich regions within the fluid bed played a role in SO2’s generation. The response of COS to sulphur in the feed was quite prompt, whereas SO2 was more delayed. It is proposed that the bed material sequestered sulphur from the feed, later aiding SO2 generation. The more reducing gas phase regions above the bed would have facilitated COS – hence its faster response. These results provide a useful insight, with further analysis on a suite of performed experiments underway, along with thermodynamic modelling. 相似文献
49.
Climate change scenarios predict lower flow rates during summer that may lead to higher proportions of wastewater in small and medium sized streams. Moreover, micropollutants (e.g. pharmaceuticals and other contaminants) continuously enter aquatic environments via treated wastewater. However, there is a paucity of knowledge, whether extended exposure to secondary treated wastewater disrupts important ecosystem functions, e.g. leaf breakdown. Therefore, the amphipod shredder Gammarus fossarum was exposed to natural stream water (n = 34) and secondary treated wastewater (n = 32) for four weeks in a semi-static test system under laboratory conditions. G. fossarum exposed to wastewater showed significant reductions in feeding rate (25%), absolute consumption (35%), food assimilation (50%), dry weight (18%) and lipid content (22%). Thus, high proportions of wastewater in the stream flow may affect both the breakdown rates of leaf material and thus the availability of energy for the aquatic food web as well as the energy budget of G. fossarum. 相似文献
50.