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Journal of Environmental Sciences 2012年第8期24卷 1371-1377页

作者： Seungjoon Chung makram T.suidan Albert D.Venosa Technology Development Center Samsung Engineering Co.Ltd.SuwonGyeonggi 443-823South Korea Faculty of Engineering and Architecture American University of BeirutBeirut 11072020Lebanon National Risk Management Research Laboratory U.S.Environmental Protection AgencyCincinnatiOH 45268USA

Ammoniated bagasse is a plant-derived organic sorbent that can be used for capturing oil and for supplying slow-release nutrients to oil-degrading microorganisms. We investigated the oil-wicking behavior of this sorbent under various conditions for its effectiveness in remediating oil-contaminated wetlands. Abiotic microcosms simulating a wetland environment were used to assess the influence of sand particle sizes （20x30 and 60x80 U.S. mesh）, degrees of oil saturation （25% and 75%）, water table levels （on top of the clean sand layer, oiled-sand layer, and sorbent layer）, and the presence of sorbent. Results indicated that oil wicking favors higher oil contamination, larger sand particle size, and low water coverage. Water coverage was the predominant factor limiting the effectiveness of sorbent. The most plausible explanation for this limitation was that sorbent captured more water than oil at higher water coverage.

关键词： crude oil wetlands sorbent remediation sediment

Performance of rotating drum biofilter for volatile organic compound removal at high organic loading rates

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Journal of Environmental Sciences 2008年第3期20卷 285-290页

作者： YANG Chunping CHEN Hong ZENG Guangming ZHU Xueqing suidan makram T College of Environmental Science and Engineering Hunan University Changsha 410082 China Department of Civil and Environmental Engineering University of Cincinnati Cincinnati OH 45221-0071 USA

Uneven distribution of volatile organic compounds （VOCs） and biomass, and excess biomass accumulation in some biofilters hinder the application of biofiltration technology. An innovative multilayer rotating drum biofilter （RDB） was developed to correct these problems. The RDB was operated at an empty bed contact time （EBCT） of 30 s and a rotational rate of 1.0 r/min. Diethyl ether was chosen as the model VOC. Performance of the RDB was evaluated at organic loading rates of 32,1, 64.2, 128, and 256 g ether/（m^3·h）（16.06 g ether/（m^3·h） ≈ 1.0 kg chemical oxygen demand （COD）/（m^3·d））. The EBCT and organic loading rates were recorded on the basis of the medium volume. Results show that the ether removal efficiency decreased with an increased VOC loading rate. Ether removal efficiencies exceeding 99% were achieved without biomass control even at a high VOC loading rate of 128 g ether/（m^3·h）. However, when the VOC loading rate was increased to 256 g ether/（m^3·h）, the average removal efficiency dropped to 43%. Nutrient limitation possibly contributed to the drop in ether removal efficiency. High biomass accumulation rate was also observed in the medium at the two higher ether loading rates, and removal of the excess biomass in the media was necessary to maintain stable performance. This work showed that the RDB is effective in the removal of diethyl ether from waste gas streams even at high organic loading rates. The results might help establish criteria for designing and operating RDBs.

关键词： biofiltration organic loading rotating drum biofilter (RDB) volatile organic compound

Novel continuous single-step synthesis of nitrogen-modified TiO_2 by flame spray pyrolysis for photocatalytic degradation of phenol in visible light

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Journal of Materials Science & Technology 2018年第9期34卷 1494-1502页

作者： Thirupathi Boningari Siva Nagi Reddy Inturi makram suidan Panagiotis G.Smirniotis Chemical Engineering Program College of Engineering & Applied Science University of Cincinnati Environmental Engineering College of Engineering & Applied Science University of Cincinnati

A novel rapid and continuous process has developed for the synthesis of nitrogen-doped TiO2（N-TiO2）with flame spray pyrolysis（FSP） method. The nitrogen incorporation into TiO2 was achieved by a facile modification（addition of dilute nitric acid） in the precursor for the synthesis. The catalysts were characterized by X-ray diffraction, Raman spectroscopy, transmission electron microscopy, diffuse reflectance spectroscopy, and X-ray photoelectron spectroscopy. The doping of nitrogen into the TiO2 was confirmed by X-ray photoelectron spectroscopy（XPS） and energy dispersive X-ray（EDX） spectroscopy. The UV-vis spectra of the modified catalysts（with primary N source） exhibited band-gap narrowing for 4 N-TiO2 with band gap energy of 2.89 eV, which may be due to the presence of nitrogen in TiO2 structure. The introduction of secondary N-source（urea） into TiO2 crystal lattice results in additional reduction of the band gap energy to 2.68 eV and shows a significant improvement of visible light absorption. The N-TiO2 nanoparticles modified by using secondary N-source showed significant photocatalytic activity under visible light much higher than TiO2. The higher activity is attributed to the synergetic interaction of nitrogen with the TiO2 lattice. The lowering of the band-gap energy for the flame made N-doped TiO2 materials implies that the nitrogen doping in TiO2 by aerosol method is highly effective in extending the optical response of TiO2 in the visible region. The nitrogen atomic percentage has increased monotonically（0.09%-0.15%）with the increase in primary nitrogen source（nitric acid）, and significantly boosted to 0.97% when secondary nitrogen source（urea） was introduced. The highest rate of phenol degradation was obtained for catalysts with secondary N source due to increase in N content in the catalyst.

关键词： Flame spray pyrolysis(FSP) Titania (TiO2) Visible-light-induced Liquid phase Phenol photodegradation

Biodegradation of alkylates under less agitated aquifer conditions

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Journal of Environmental Sciences 2013年第8期25卷 1529-1538页

作者： Jay J. Cho makram T. suidan Albert D. Venosa URS Corporation 7720N 16th St. Ste 100 Phoenix AZ 85020 USA Faculty of Engineering and Architecture American University of Beirut Dean's officeP.O.Box 11-0236 Riad El Solh 1107 2020 Beirut Lebanon US Environmental Protection Agency National Risk Management Research LaboratoryCincinnati OH 45268 USA

The biodegradability of three alkylates （2,3-dimethylpentane, 2,4-dimethylpentane and 2,2,4-trimethylpentane） under less agitated aquifer conditions was investigated in this study. All three alkylates biodegraded completely under these conditions regardless of the presence or absence of ethanol or benzene, toluene, ethylbenzene, and xylenes （BTEX） in the feed. In the presence of ethanol, alkylates degradation was not inhibited by ethanol. However, alkylates degraded more slowly in the presence of BTEX suggesting competitive inhibition to microbial utilization of alkylates. In the sterile controls, alkylates concentrations remained unchanged throughout the experiments.

关键词： biodegradation alkylates inhibition BTEX ethanol

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厌氧活性炭滤池对酚类的处理

环境科学与管理 1985年第3期 1-11页

作者： makram T.suidan 姜安玺

绪言酚类化物(苯的一元羟基衍生物)是炼焦厂、煤气化厂、炼油厂、石油化工、溶剂、炸药生产、玻璃纤维制造以及飞机维修等工业废水的主要成分。Mazur以及 Ganczarczyk 和 ELion发现炼焦废水用活性污泥处理,其中酚的去除率超过99％。Cape... 详细信息

绪言酚类化物(苯的一元羟基衍生物)是炼焦厂、煤气化厂、炼油厂、石油化工、溶剂、炸药生产、玻璃纤维制造以及飞机维修等工业废水的主要成分。Mazur以及 Ganczarczyk 和 ELion发现炼焦废水用活性污泥处理,其中酚的去除率超过99％。Capestany 等人报导了用活性污泥处理高浓度含酚废水的类似研究结果。氧化塘、污泥曝气湖和氧化塔据报导对低浓度含酚废水处理或对进一步降低活性污泥厂出水中的酚含量是有效的。一般说来,各种好氧生化处理法对含酚废水处理是有效的,其结果使废水的化学需氧量(COD)、总有机炭(TOC)

关键词：滤柱进水 COD TOC 厌氧粒状活性炭甲烷产量酚类