共查询到19条相似文献,搜索用时 107 毫秒
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固体三元稳态ClO2杀菌剂稳定性、腐蚀性及杀菌消毒特性研究 总被引:3,自引:0,他引:3
对固体三元稳态二氧化氯杀菌剂的稳定性、腐蚀性及杀菌消毒特性进行研究后发现,该杀菌剂ClO2活化得率在95.5%以上;活化酸度为pH=4.84; 于(54±1) ℃放置14 d,ClO2含量的下降率为3.1%;用ClO2质量浓度 80 mg/L的消毒液作用3~5 min,对大肠杆菌和金黄色葡萄球菌的杀灭率为100%;ClO2质量浓度 400 mg/L的消毒液作用60 min对枯草杆菌黑色变种芽孢的杀灭率为100%;ClO2质量浓度 300 mg/L的消毒液作用20 min,可以完全破坏悬液中HBsAg的抗原性;ClO2质量浓度 800 mg/L的消毒液对不锈钢基本无腐蚀,对铜片、碳钢、铝片均有中度腐蚀. 相似文献
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采用化学氧化法应急处理甲醛污染饮用水源,探讨H_2O_2、NaClO、Ca(ClO)_2、KMnO_4、K_2FeO_4这5种氧化剂在典型浓度下投加量、pH、时间、温度等反应条件对甲醛废水的去除效果并找出最佳工艺条件。结果表明,H_2O_2、NaClO、Ca(ClO)_2可作为应急处理甲醛污染饮用水源的药剂,典型浓度下处理的最佳工艺条件:常规pH条件下反应30 min,当水中甲醛浓度依次超标10、20、50、100、200、500、1 000倍时,0~20℃时分别投加20 g/L Ca(ClO)_2、100 mL/L NaClO(8%)、25g/L Ca(ClO)2、200 mL/L NaClO、100 g/L Ca(ClO)_2、300 mL/L NaClO、400 mL/L NaClO;20~35℃时适宜投加H2O2(30%),分别投加60、100、120、250、400、600、800 mL/L。经处理后甲醛浓度基本能降到标限以内,甲醛去除率可达到99%以上。 相似文献
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利用ClO2氧化/粉煤灰吸附协同体系对一实际印染废水进行了处理实验研究,结果表明,对于CODcr为750mg/L、色度为250倍的1000mL印染废水,当溶液的pH为4.5,ClO2用量20mg/L,粉煤灰吸附用量2.5g,在合适的反应和吸附时间下,处理后的废水CODcr< 100mg/L,色度<40倍,达到了国家纺织染整工业废水的排放要求(GB 4287-92),本文同时对二者的协同机理进行了理论上的探讨. 相似文献
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在酸性环境中通过NaCl电解协同NaClO2化学氧化方法制备的复合二氧化氯溶液中ClO2和自由氯浓度分别达到70%和20%左右,系统地研究了电流密度(A)、NaClO2与NaCl质量比(B)、电解时间(C)对复合溶液中组分浓度和质量百分数的影响,并将复合溶液用于城市污水二级处理出水的消毒。结果表明,复合溶液中自由氯的浓度主要受因素C和A的影响,ClO2的浓度主要受因素C和B的影响,而A对副产物ClO2-和ClO3-的影响最大。总大肠菌群数在105~108个.L-1的城市污水二级处理出水采用复合溶液消毒时,当其中ClO2投加量为4 mg/.L-1,自由氯含量不低于1.20mg.L-1,经30min接触后出水生物学指标满足GB/ T18920-2002 的要求。既降低了消毒剂的使用量,又减少了消毒副产物ClO2-的生成。 相似文献
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应用方波溶出伏安法,玻炭汞膜电极为工作电极对铜、锌测定进行了研究。在NH3-NH4Cl体系中,得出铜对锌测定最低影响浓度为5×10^-6 mol/L,低于此浓度时,适合单一锌离子标准曲线ip(10^-6A)=0.609 1 c(10^-5 mol/L)+4.1495,r=0.995 4;锌对铜测定最低影响浓度为5×10^-3mol/L,铜在含锌5×10^-5 mol/L时适用标准曲线ip(10^-5A)=0.662 2 c(10^-5 mol/L)+0.966 5,r=0.995 2,铜在含锌低于10^-7 mol/L时适用单一铜离子的标准曲线ip(10^-5A)=0.891 2 c(10^-5mol/L)+0.848 5,r=0.992 0,同时测得回收率为94%~97% 相似文献
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2,5-二氨基己二酸四亚甲基膦酸的阻垢缓蚀性能研究 总被引:1,自引:0,他引:1
采用鼓泡法和旋转挂片失重法评定了2.5-二氨基己二酸四亚甲基膦酸(DAATMP)的阻垢和缓蚀性能,探讨了药剂浓度、溶液pH、钙离子浓度、反应时间等对阻垢和缓蚀性能的影响.试验结果表明:在Ca2 质量浓度为120 mg/L,pH=8.5,温度60℃,阻垢剂投加质量浓度为5 mg/L的条件下,阻垢率达到89.0%.对比实验表明:在pH=7.0,温度为80℃,Ca2 质量浓度为120 mg/L,阻垢剂投加质量浓度为10 mg/L的条件下,DAATMP的阻垢效果明显优于PBTCA和DETPMP,阻垢率达到84%.在Ca2 200 mg/L、Mg2 48 mg/L、Cl-430 mg/L、HCO3-120 mg/L、缓蚀剂投加质量浓度为80 mg/L、挂片时间72 h的条件下,其对A3钢的缓蚀率达到89.1%;若以120 mg/L的DAATMP 4 mg/L的Zn2 复合预膜剂预膜24 h后,投加10 mg/L DAATMP和6 mg/L Zn2 复合药剂,其对A3钢和铜的缓蚀率分别达到92.64%和95.2%. 相似文献
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This study was designed to elucidate the behavior of chlorine dioxide in drinking water systems. Furthermore, the factors
that influence the formation of chlorite, chlorate in terms of reaction time, concentration of chlorine dioxide, pH, temperature
and UV irradiation were experimentally reviewed. At 20 ‡C, pH 7, 70–80% of chlorine dioxide injected was converted to chlorite
and 0–10% of that was transformed into chlorate within 120 min with 2.91 mg/L of DOC. The amount of chlorite formed also increased
when pH and temperature increased. As DOC content increased, the residual chlorine dioxide decreased but the amount of chlorite
and chlorate were increased. These experiments revealed that chlorate was a dominant by-product under UV irradiation. The
models that were obtained by the regression analysis for the formation of chlorite and chlorate from chlorine dioxide with
Han River water are as follows: Chlorite (mg/L)=10-2.20[ClO2]0.45[pH]0.90[temp]0.27[TOC]1.04[time]0.20, Chlorate (mg/L)=10-2.61[ClO2]1.27[pH]-0.50[temp]1.28 [TOC]0.31[time]0.12 相似文献
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The formation of the by-product chlorite after using chlorine dioxide for the disinfection of drinking water depends on the quantity of the organic matter dissolved in the water. A further decisive factor for the chlorite formation is the level of residual free chlorine dioxide. The chlorine dioxide demand decreases by application of activated carbon filtration, especially after the use of a combination of ozone and activated carbon treatment of the water. Nevertheless, higher chlorine dioxide residuals are a source of chlorite and chlorate formation. The concept of the “Minimum Chlorine Dioxide Dosage (MCDD)” is developed in order to give a clue to the water companies for an optimized chlorine dioxide dose without compromising the disinfection efficiency. By application of the MCDD, the residual level of chlorine dioxide is focused to 0.05 mg/L after 0.5 h contact time. In the range of the MCDD the ratio of the chlorite formation and the chlorine dioxide demand is nearly independent of the level of DOC. 相似文献
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介绍用烧碱吸收氯碱生产过程中的大量尾氯,所得吸收液在过氯状态下的主要组分是氯酸钠和氯化钠。利用该吸收液与干燥过氯气的废硫酸反应生成二氧化氯,既解决了废液的污染问题,同时又可获得可观的经济效益。 相似文献
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