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1.
本文研究处理用硫酸酸化脱氰、再用氢氧化钠除镍含镍氰复杂废水的效果。以工厂废水及实验室所配溶液试验均取得良好效果，可使原料水氰化物从１５０ｍｇ／Ｌ降到８ｍｇ／Ｌ，从镍５０ｍｇ／Ｌ降到４ｍｇ／Ｌ以下。 相似文献
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Yubo Yan Xiaodong Liu Xiuyun Sun Fangbian M Lianjun Wang Jiansheng Li Jinyou Shen 《环境科学学报(英文版)》2014,26(5):970-980
Alkaline residue(AR) was found to be an efficient adsorbent for phosphate removal from wastewater. The kinetic and equilibrium of phosphate removal were investigated to evaluate the performance of modified alkaline residue. After treatment by NaOH(AR-NaOH), removal performance was significantly improved, while removal performance was almost completely lost after treatment by HCl(AR-HCl). The kinetics of the removal process by all adsorbents was well characterized by the pseudo second-order model. The Langmuir model exhibited the best correlation for AR-HCl, while AR was effectively described by Freundlich model. Both models were well fitted to AR-NaOH. The maximum adsorption capacities calculated from Langmuir equation were in following manner: AR-NaOH AR AR-HCl. Phosphate removal by alkaline residue was pH dependent process. Mechanisms for phosphate removal mainly involved adsorption and precipitation, varied with equilibrium pH of solution. For AR-HCl, the acid equilibrium pH( 6.0) was unfavorable for the formation of Ca-P precipitate, with adsorption as the key mechanism for phosphate removal. In contrast, for AR and ARNaOH, precipitation was the dominant mechanism for phosphate removal, due to the incrase on pH( 8.0) after phosphate removal. The results of both XRD and SEM analysis confirmed CaHPO4·2H2O formation after phosphate removal by AR and AR-NaOH. 相似文献
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Cleaning of hollow-fibre polyvinyl chloride (PVC) membrane with di erent chemical reagents after ultrafiltration of algal-richwater was investigated. Among the tested cleaning reagents (NaOH, HCl, EDTA, and NaClO), 100 mg/L NaClO exhibited the bestperformance (88.4% 1.1%) in removing the irreversible fouling resistance. This might be attributed to the fact that NaClO couldeliminate almost all the major foulants such as carbohydrate-like and protein-like materials on the membrane surface, as confirmed byFourier transform infrared spectroscopy analysis. However, negligible irreversible resistance (1.5% 1.0%) was obtained when themembrane was cleaning by 500 mg/L NaOH for 1.0 hr, although the NaOH solution could also desorb a portion of the major foulantsfrom the fouled PVC membrane. Scanning electronic microscopy and atomic force microscopy analyses demonstrated that 500 mg/LNaOH could change the structure of the residual foulants on the membrane, making them more tightly attached to the membranesurface. This phenomenon might be responsible for the negligible membrane permeability restoration after NaOH cleaning. On theother hand, the microscopic analyses reflected that NaClO could e ectively remove the foulants accumulated on the membrane surface. 相似文献
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在常规工艺基础上,通过投加氢氧化钠,实验进行了应急去除重金属镉的研究。实验结果表明,该方法能有效去除饮用水水源的镉,效果稳定,可进行应急处理。对pH、镉初始浓度和混凝剂投加量3个影响因素的灰色关联分析表明,3个因素对镉去除效果影响的大小排序为:滤后水pH>混凝剂投加量>镉初始浓度。在水源镉突发污染时,在原有常规水处理工艺基础上,通过控制滤后水pH可实现对重金属镉的去除,pH的控制值与水源水质有关。 相似文献
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现在使用的挥发酚保存剂是磷酸和硫酸酮，磷酸既有腐蚀性，又不便携带，给采样带来许多麻烦，研究表明：用氢氧化钠作为保存剂，采样时携带方便，操作简单，监测结果靠，是一种优于磷酸和硫酸铜的保存剂。 相似文献
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针对容量法测定氢氧化钠气溶胶的不足，研究了对其进行比色测定。实验证明，此法操作简单，灵敏度高、重现性好。可用于监测空气中的氢氧化钠气溶胶的测定。 相似文献
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该文介绍了用无水乙醇或用氢氧化钠代替N，N-二甲基酰胺作溶剂，配制吡唑啉酮显色剂，在异烟酸-吡唑啉酮测定水中氰化物时的应用及实验结果。 相似文献