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331.
Chunping Yang Guanlong Yu Guangming Zeng Haining Yang Fayuan Chen Congying Jin 《环境科学学报(英文版)》2011,23(8):1325-1333
Two identical bench-scale biotrickling filters (BTFs), BTF 1 and BTF 2, were evaluated for toluene removal at various gas empty bed
contact times (EBCTs) and organic loadings. BTF 1 and BTF 2 were packed with structured and cubic synthetic polyurethane sponges,
respectively. At a constant toluene loading of 16 g/(m3 hr), toluene removal efficiencies decreased from 98.8% to 64.3% for BTF 1
and from 98.4% to 74.1% for BTF 2 as gas EBCT decreased from 30 to 5 sec. When the toluene loading increased from 35 to 140
g/(m3 hr) at a gas EBCT of 30 sec, the removal efficiencies decreased from 99.1% to 77.4% for BTF 1 and from 99.0% to 81.5% for
BTF 2. The pressure drop for both BTFs increased with increased air flow rate, and did not significantly vary while the toluene loading
was increased under similar operation conditions. BTF 1 and BTF 2 could start up successfully within 19 and 27 days, respectively,
when packed with fresh sponge media, and the performances could be restored in 3–7 days after biomass was removed and wasted
from the media. BTF 2 displayed higher removal efficiency even under shorter EBCT or higher loading rate than BTF1 when other
operation conditions were similar, while it showed lower pressure drop than BTF 1 during the whole period of operation. These results
demonstrated that both BTFs could treat waste gas containing toluene effectively. 相似文献
332.
Xiaoyou Zhang Xianli Ruan Minchan Yan Yaxian Zhao Wuji Wei Yongjian Yang Haiming Xu Yan Li 《环境科学学报(英文版)》2011,23(7):1199-1204
Polybrominated diphenyl ethers (PBDEs) as ubiquitous persistent organic pollutants have attracted much attention in recent years.
Exposure to PBDEs could induce a high health risk for children. The aim of this study was to investigate the PBDEs exposure of
children (9–12 years) from Taizhou, China. Fifty-eight blood samples were collected in one school in a mountainous area in Taizhou.
The concentrations of Σ9PBDEs (sum of BDE-28, -47, -99, -100, -153, -154, -183, -197 and -209) ranged from 2.66 to 33.9 ng/g lipid
wet (lw) with a median of 7.22 ng/g lw. These concentrations were lower than those of children in USA, but close to European and
Asian general population levels. The results showed that children in Taizhou countryside were at a low level of PBDEs exposure. The
predominant congener was BDE-209, followed by BDE-28, -47, -197 and -153. High abundance of BDE-209 was consistent with the
pollution background of PBDEs in China characterized by high brominated congeners as main pollutants. 相似文献
333.
海带加工废水属高浓度有机废水(HCOWW).将HCOWW处理回用,实施清洁生产,对于进一步发展沿海经济,意义重大.采用自行设计制作浸没式膜生物反应器(iMBR),进行海带加工废水的处理实验,重点考察iMBR处理废水的效果及其影响因数.结果表明,iMBR对CODCr,NH4-N,TP和甲醛(HCHO)的平均去除率分别达到... 相似文献
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ZHOU Weihu LI Tao CAI Chuanghu HUANG Liangmin WANG Hankui XU Jirong DONG Junde ZHANG Si 《环境科学学报(英文版)》2009,21(5):595-603
The composition of phytoplankton and the dynamics of phytoplankton and bacterioplankton biomass (PB and BB, respectively) of Sanya Bay, South China Sea, were determined. A total of 168 species (67 genera) phytoplankton were identified, including Bacillariophyta (diatom, 128 species), Pyrrophyta (35 species), Cyanophyta (3 species), and Chrysophyta (2 species). Annual average abundance of phytoplankton was 1.2 × 107 cells/m3, with the highest abundance in autumn, and the lowest in summer. Annual average dive... 相似文献
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二段式污泥低温干化的原理与水汽热量平衡 总被引:3,自引:0,他引:3
在深入研究污泥成分和通过模拟实验分析污泥干化特性的基础上,首次建立了利用烟气余热的二段式污泥低温干化技术,同时给出了该技术的工作原理和计算了污泥干化过程的水汽、热量、物料平衡.结果表明,利用烟气余热的二段式污泥低温干化技术不仅能在不增加新能耗的情况下使污泥得到有效地干化,而且能使污泥自然形成质地坚硬并保存原始污泥90%以上热值的颗粒;污泥干化成粒装置内的螺旋板、扬料板和链锤等辅助设备可以明显提高污泥干化效率;烟气量为1.5×105m.3h-1,烟温为155℃,经污泥干化后降温50℃,可使100.td-1污泥从含水率78%干化至40%.这为污泥的无害化、减量化、资源化处理提供了理论依据和技术支撑,对开辟以废治废和废弃物循环利用的污泥处理新途径具有重要的实践指导意义. 相似文献