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601.
高浓度薛佛氏盐生产废水的资源化处理工艺研究 总被引:7,自引:0,他引:7
提出了一种薛佛氏盐生产废水处理工艺 ,其方法是 :首先用 730 1树脂—磺化煤油络合萃取回收废水中的 R盐 ,萃取后的废水再用 H2 O2 / Fe2 +催化氧化处理 ;研究了影响萃取效率的主要因素。实验表明 ,R盐回收率可达 98%以上 ;催化氧化后的废水可达标排放 相似文献
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In situ chemical oxidation (ISCO) schemes using MnO4- have been effective in destroying chlorinated organic solvents dissolved in ground water. Laboratory experiments and field pilot tests reveal that the precipitation of Mn oxide, one of the reaction products, causes a reduction of permeability, which can lead to flow bypassing and inefficiency of the scheme. Without a solution to this problem of plugging, it is difficult to remove DNAPL from the subsurface completely. In a companion paper, we showed with batch experiments that Mn oxide can be dissolved rapidly with certain organic acids. This study utilizes 2-D flow-tank experiments to examine the possibility of nearly complete DNAPL removal by ISCO with MnO4-, when organic acids are used to remove Mn oxide. The experiments were conducted in a small 2-D glass flow tank containing a lenticular silica-sand medium. Blue-dyed trichloroethylene (TCE) provided residual, the perched and pooled DNAPL. KMnO4 at 200 mg/l was flushed through the DNAPL horizontally. Once plugging reduced permeability and prevented further delivery of the oxidant, citric or oxalic acids were pumped into the flow tank to dissolve the Mn oxide precipitates. Organic ligands removed the Mn oxide precipitates relatively quickly, and permitted another cycle of MnO4- flooding. Cycles of MnO4-/acid flooding continued until all of the visible DNAPL was removed. The experiments were monitored with chemical analysis and visualization. A mass-balance calculation indicated that by the end of the experiments, all the DNAPL was removed. The results show also how heterogeneity adds complexity to initial redistribution of DNAPL, and to the efficiency of the chemical flooding. 相似文献
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607.
Yu Jiang Beidou Xi Rui Li Mingxiao Li Zheng Xu Yuning Yang Shaobo Gao 《Frontiers of Environmental Science & Engineering》2019,13(6):89
608.
改性PAN非织造布铁配合物可见光降解甲醛气体 总被引:1,自引:0,他引:1
使用盐酸羟胺对聚丙烯腈非织造布(nPAN)进行了化学改性,并将所得改性聚丙烯腈非织造布(AO-nPAN)与Fe(III)配位制得改性聚丙烯腈非织造布铁配合物(Fe-nPAN),分别使用扫描电镜(SEM)、傅立叶红外光谱(FTIR)、X射线衍射(XRD)和UV-Vis吸收光谱对Fe-nPAN进行了表征,然后将其作为光催化剂应用于甲醛气体的氧化降解反应中.结果表明:提高Fe(III)初始浓度、反应温度和AO-nPAN的增重率都能够增加Fe-nPAN的Fe(III)配合量.Fe-nPAN中偕胺肟基团与Fe(III)发生了配位反应,使其在可见光区有明显的吸收带.增加Fe(III)配合量和可见光强度都能够促进甲醛的降解反应,而且与PAN纱线制备的铁配合物催化剂相比,Fe-nPAN明显具有更高的催化活性. 相似文献
609.
低温生物除铁除锰工艺快速启动与滤速的探求 总被引:4,自引:0,他引:4
为净化低温(5~6℃)高铁高锰这种地下水质,通过水厂实地滤柱实验表明,在该种水质下,适当调整工艺运行的参数能够快速富集铁锰氧化微生物,在120d左右实现生物除铁除锰工艺的快速启动和稳定运行;滤柱启动过程中,对滤层厚度进行了优化,1500mm厚新滤料在启动过程中会导致出水锰超标,而800mm厚成熟生物滤层在6~8m/h滤速下,可完成对铁、锰的深度去除;在此条件下,进行滤速探求的实验研究,最高滤速可达到16.5m/h保证出水铁锰合格,并给出了相应的反冲参数. 相似文献
610.
Jiwan SINGH Yoon-Young CHANG Jae-Kyu YANG Seon-Hong KANG Janardhan Reddy KODURU 《Frontiers of Environmental Science & Engineering》2016,10(4):9
Phenol removal by n/m Fe in the presence of H2O2 was highly effective.
Increasing the amounts of n/m Fe and H2O2?increased the phenol removal rate.
Phenol removal was decreased with an increase in the concentration of phenol.
The natural pH (6.9) of the solution was highly effective for phenol removal.
The pseudo-first-order kinetics was best fitted for the degradation of phenol.
The study investigates the magnetic separation of Fe from automobile shredder residue (ASR) (<0.25 mm) and its application for phenol degradation in water. The magnetically separated Fe was subjected to an ultrasonically assisted acid treatment, and the degradation of phenol in an aqueous solution using nano/micro-size Fe (n/m Fe) was investigated in an effort to evaluate the possibility of utilizing n/m Fe to remove phenol from wastewater. The prepared n/m Fe was analyzed by scanning electron microscopy (SEM) and Fourier transform infrared spectroscopy (FTIR). The effects of the dosages of n/mFe, pH, concentration of phenol and amount of H2O2 on phenol removal were evaluated. The results confirm that the phenol degradation rate was improved with an increase in the dosages of n/mFe and H2O2; however, the rate is reduced when the phenol concentration is higher. The degradation of phenol by n/mFe followed the pseudo-first-order kinetics. The value of the reaction rate constant (k) was increased as the amounts of n/m Fe and H2O2 increased. Conversely, the value of k was reduced when the concentration of phenol was increased. The probable mechanism behind the degradation of phenol by n/m Fe is the oxidation of phenol through hydroxyl radicals which are produced during the reaction between H2O2 and n/m Fe. 相似文献