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MBTシュ?ズ ??店 vdd vzx swvq cbz

发表日期:2011-06-16 摄影器材: 点击数: 投票数:
 Lime treatment formaldehyde Wastewater 
 H of reaction time effects. It can be seen from Figure 5, the raw water pH 7 formaldehyde polysaccharide reaction time required to reach the end of 160rain, and when the raw water pa is 50,100,150,herve leger toronto,200 reaction time / min Figure 5 the initial raw water pH on formaldehyde degradation effect ∞ Indian Park ∞ ∞ fanny lion plus plus. Summer Ⅱ, hide Lu Shan Lake coffee 022ll shake 12 required response time of just 100rain. Can be seen, the higher the alkaline reaction environment more conducive to formaldehyde polysaccharide reaction. 2.2.4 watery formaldehyde concentration in the initial reaction of any chemical reaction rates are affected by the concentration of reactants, formaldehyde polysaccharide response is no exception. The other reaction conditions fixed the same test to study the concentration of HCHO and lime 2.5, the reaction temperature is 6O ℃,Beats By Dre Headphones, the raw water pH 7, the initial formaldehyde concentration in the raw water polysaccharide reaction of formaldehyde, the reaction results shown in Figure 6. Figure 6 The initial formaldehyde concentration on the reaction time required for the effects seen from Figure 6, the greater the initial concentration of formaldehyde, formaldehyde polysaccharide response required response time shorter. Initial concentration of formaldehyde increased by the 500nL to 4000mg / L, the reaction of formaldehyde polysaccharide reaction time required for the corresponding reduced by 185min 105min. Can be seen, the initial concentration of formaldehyde required for the reaction of formaldehyde polysaccharide reaction time have a significant impact, high concentrations of formaldehyde in wastewater can be a good reaction, low concentrations of formaldehyde in water is relatively slow response. Therefore, the relatively high concentration of lime is more suitable for wastewater treatment of formaldehyde. 2.3 change in pH during the reaction and the reaction mechanism of the reaction conditions in the 2.1 to study the lime treatment of wastewater removal of formaldehyde, the specific results shown in Figure 7. Figure 7 lime treatment of formaldehyde removal from wastewater can be seen in Figure 7, the degradation of formaldehyde and pH curve of the curve remained the same trend, with lower concentrations of formaldehyde, the reaction pH of water is gradually reduced, when decreases sharply when the concentration of formaldehyde, pH also dramatically reduced from 12.89 into 12.81. It can be seen, the reaction of lime in the process of formaldehyde polysaccharides OH is not just to provide one from the OH-from a purely catalytic role, but in the reaction process may be involved in the OH-reaction leading to gradually reduce its concentration. Visible, formaldehyde is a polysaccharide reaction under alkaline conditions, the consumption of OH-reaction, which is working with 2.2.1 in the dosage of lime derived from the greater the shorter the reaction time is consistent point of view, because the greater the dosage of lime, the reaction of OH-ionization provides the more, so formaldehyde reaction for polysaccharides faster. 3 Conclusions (1) the initial concentration of lime treatment of formaldehyde in water must be feasible and effective. The initial concentration of formaldehyde was 2001.5mg / I, CO [) c is 3019mg / L of formaldehyde waste in the appropriate reaction conditions, reaction 1.5h, wastewater formaldehyde, CODc ~ removal rates up to 99.93 , 5.58. Visible, Lime formaldehyde formaldehyde have a good water removal, for further biological treatment to create a good biological condition. (2) lime dosage, reaction temperature, water initial pH, initial concentration of formaldehyde in water lime treatment of the effect of formaldehyde in water are to a certain extent. Lime dosage the greater the higher the temperature, the higher the initial pH of water samples, water samples the higher the initial concentration of formaldehyde, formaldehyde polysaccharide shorter reaction time. (3) reaction of suitable polysaccharides formaldehyde under alkaline conditions, the reaction process consumes OH ~, lime reaction in the process of formaldehyde glycans can play a buffer pH, continue to provide the role of OH. References 1 Zhang Zhihu, Shao Hua. Formaldehyde and detection methods are reviewed. Chinese Occupational Medicine, 2005,Beats By Dre Studio,32 (1): 55 - 572 Wuxi Kang. Organic chemical wastewater treatment technology. Beijing: Chemical Industry Press, 19993MoussaviM, MowlaD, EdrakiH. ChemicalPretreatmentofFormaldehyde-ContainingEffluents. EnvironSciTechnol, 2002, (36): 3822 ~ 3826 ☆ Correspondence: 250014 Jinan City Rd 46 small Weisi Construction Department of Shandong Province, Shandong Province, north on the third floor of the Municipal Urban Construction Design Institute Tel: 15169173032E-mail: wangzhihai234234 @ 163. corn Received Date :2009 -06-22 Revised 2009 -10-30 water drainage Vo1.36No. 12,010,herve leger sale,145, head, u00u,MBTシュ?ズ ??店, constriction 
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