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在静态条件下研究了改性沸石对氨氮的吸附特性,考察了不同条件下改性沸石对含氨氮废水的处理能力。结果表明:热改性温度为500℃、pH值为7、改性沸石加入量为30g/L、吸附时间120min条件下,改性沸石对氨氮的去除率可达95%以上。 相似文献
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采用人造沸石吸附景观用水中低浓度氨氮,研究了人造沸石投加量、反应时间、初始pH、人造沸石目数(粒径)等因素对水样中氨氮吸附效果的影响,分析了其吸附动力学方程在人造沸石吸附氨氮实验中的拟合情况.结果表明:人造沸石能够有效的处理广州荔湾湖水中的低浓度氨氮景观湖水,当pH值在5~7时,人造沸石投加量为10mg/L时,反应时间180min后,氨氮去除率可达到85%左右。人造沸石投加量、pH值、反应时间、沸石粒径对氨氮的吸附效果都有影响.投加量增加,人造沸石对水样中氨氮的去除效果也增加,但吸附量随之减少;随反应时间的增长,人造沸石对水样中氨氮的吸附效果增强,但当人造沸石吸附饱和后,吸附效果不再随时间的增长而增强;人造沸石在酸性条件下对氨氮的吸附效果较好;人造沸石目数对水样氨氮有较大影响,去除率随沸石目数的增加而增加。 相似文献
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采用人造沸石吸附景观用水中低浓度氨氮,研究了人造沸石投加量、反应时间、初始pH、人造沸石目数(粒径)等因素对水样中氨氮吸附效果的影响,分析了其吸附动力学方程在人造沸石吸附氨氮实验中的拟合情况。结果表明:人造沸石能够有效的处理广州荔湾湖水中的低浓度氨氮景观湖水,当pH值在57时,人造沸石投加量为10mg/L时,反应时间180min后.氨氮去除率可达到85%左右。人造沸石投加量、pH值、反应时间、沸石粒径对氨氮的吸附效果都有影响。投加量增加,人造沸石对水样中氨氮的去除效果也增加,但吸附量随之减少;随反应时间的增长,人造沸石对水样中氨氮的吸附效果增强,但当人造沸石吸附饱和后,吸附效果不再随时间的增长而增强;人造沸石在酸性条件下对氨氮的吸附效果较好;人造沸石目数对水样氨氮有较大影响,去除率随沸石目数的增加而增加. 相似文献
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以偏高岭土基地质聚合物为基本骨架,结合水热聚合反应生成具有晶体结构的沸石分子筛(MK-GP),对该材料进行表征,并针对低浓度氨氮废水进行吸附实验,考察MK-GP型沸石分子筛对水中氨氮的去除特性。结果表明,当氨氮浓度为5~7 mg/L时,MK-GP型沸石分子筛的吸附与准二级动力学模型拟合较好,当温度为298 K时,吸附热力学参数ΔH=4.181 9 kJ/mol、ΔS=0.015 6J/(mol·K),表明MK-GP型沸石分子筛去除氨氮是自发的吸热反应。该研究为低浓度氨氮废水的处理提供了一种绿色环保的新材料。 相似文献
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沸石去除废水中氨氮及其再生 总被引:29,自引:0,他引:29
沸石对NH4^ 具有较高的选择性,可有效去除废水中的氨氮。综述了沸石的结构特征,去除氨氮的影响因素,沸石的生物再生及其工艺,并提出了今后的研究方向。 相似文献
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通过静态搅拌和振荡试验,了解不同品种的沸石处理微污染原水的适用性,研究沸石对氨氮等污染物的吸附规律,初步确定沸石的投加量,选择合适的沸石投加条件。结果表明,天然沸石和分子筛对氨氮等有机物有一定去除效果。 相似文献
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微波强化NaCl改性沸石的除氨氮效果研究 总被引:1,自引:0,他引:1
为改善天然沸石对水中氨氮的去除效果,采用微波强化NaCl活化对沸石进行改性,考察了微波加热时间、功率及活化方法的影响.结果表明,微波加热可疏通沸石内部孔道,NaCl活化能改善其离子交换性能;与经NaCl及NaCl+NaOH活化后的改性沸石相比,经89 W微波加热4min后再用饱和NaCl活化后的改性沸石,对氨氮的去除率提高了10%以上;改性沸石对氨氮的吸附速率显著加快,反应30 min时对氨氮的去除率可达80%,饱和吸附容量达到13.5 mg/g,高于天然沸石的吸附容量(10.11 mg/g). 相似文献
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沸石去除地下水中氨氮及其再生试验研究 总被引:2,自引:0,他引:2
采用沸石柱直接过滤氨氮超标地下水,考察了滤速和原水氨氮浓度对沸石柱运行效果的影响及再生流速和再生方式对再生效果的影响,以探求简单、经济、可行的去除地下水中氨氮的工艺。结果表明,滤速越低、进水氨氮浓度越小,则沸石柱的有效运行时间越长,累计合格产水量越大;再生流速对再生效果有较大影响,再生流速为10m/h时的综合再生效果最佳;逆流再生的效果略好于顺流再生的,但差异不大;沸石具有较好的重复利用性能。 相似文献
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为开发具氨氮吸附效能的沸石多孔混凝土功能材料,采用正交试验、综合表观验证分析等方法对其最优配合比进行研究。结果表明:各因素对孔隙率的影响大小顺序为骨料粒径>灰骨比>水灰比>减水剂掺量,骨料粒径对孔隙率的影响显著,灰骨比次之,水灰比与减水剂掺量影响较小;对氨氮吸附量的影响顺序是灰骨比>水灰比>骨料粒径>减水剂掺量,灰骨比对吸附量影响显著,水灰比次之,粒径与减水剂掺量影响较小。通过表观分析验证性试验结果得出最优骨料粒径是20~30 mm,水、灰、骨料的最优的配合比是0.28∶1∶8。 相似文献
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生物沸石滤池去除微污染水源水中氨氮的挂膜启动 总被引:3,自引:0,他引:3
对沸石滤料生物滤池处理微污染水源水中低浓度氨氮的挂膜启动性能进行了研究。试验结果表明,挂膜过程可以根据氨氮、亚硝酸盐氮、硝酸盐氮浓度的变化分为三个阶段:初期沸石发挥本身对铵离子的吸附交换性能,氨氮去除率达88%以上;中期开始出现生物硝化作用,亚硝酸盐积累明显,硝酸盐出水浓度不稳定,氨氮去除率稳定,但下降至65%左右;后期硝化反应稳定进行,亚硝酸盐迅速转化为硝酸盐,氨氮去除率稳定在60%以上。生物沸石滤池挂膜同时应考察亚硝酸盐氮、硝酸盐氮浓度变化,在出水亚硝酸氮明显积累后又稳定降低,且硝酸盐氮稳定积累时方可认为挂膜成功。进出水pH值的变化可以指示硝化反应的进行程度和生物膜形成阶段。 相似文献
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In order to evaluate the electrolytic decomposition characteristics of ammonia to nitrogen, this work has studied several experimental variables of electrolytic ammonia decomposition. The effects of the pH and the chloride ion in the solution, kinds of anodes such as IrO(2,) RuO(2), and Pt on the electrolytic decomposition of ammonia were compared, and the existence of a membrane equipped in the cell, the changes of the current density, the initial ammonia concentration, and so on were investigated for the decomposition. The performances of the electrode were totally in the order of RuO(2) approximately IrO(2) > Pt in both the acid and alkali conditions. The ammonia decomposition was the highest at a current density of 80 mA/cm(2), over which it decreased, because the adsorption of the ammonia at the electrode surface was hindered by the hydroxyl ions in the solution. The ammonia decomposition yield increased with the concentration of the chloride ion in the solution. However, the increment rate became much lesser over 10 g/l of the chloride ion. The RuO(2) electrode among the tested anodes generated the most OH radicals which could oxidize the ammonium ion at pH 7. 相似文献
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以厨余垃圾为原材料,在不同温度、不同停留时间下将其制成生物炭,研究了生物炭对氨氮的吸附效果和影响因素.生物炭对氨氮的吸附不仅包括物理吸附,还存在复杂的化学吸附,使用Langmuir模型可以更好地拟合描述吸附等温线,其动力学过程可以采用伪二级动力学方程描述. 相似文献
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《Planning》2017,(21)
为了研究煤在不同环境温度下对CO_2的吸附解吸特性,为利用天然煤层的强吸附性进行CO_2封存或用CO_2驱替煤层瓦斯等技术提供基础依据,针对内蒙古榆林葫芦素煤矿和河南焦作方庄煤矿煤样,在自主研制的高温气体吸附解吸设备上进行定容吸附解吸实验,研究煤样在高温条件下对CO_2的吸附解吸特性。结果表明:在相同温度条件下,同种煤样随着粒径的减小,吸附量逐渐变大,温度越高,吸附量越低,当吸附温度达到150℃左右时,不同粒径煤样的吸附量基本一致;不同粒径煤样,解吸量都随着温度的上升而增加,温度越高,初始时刻累积解吸量的增加也越快;随着时间的增加,解吸速度慢慢减小,最后达到解吸平衡;煤样解吸率随着温度的上升而变大,随着粒径的减小而逐渐增大;当温度上升到150℃以后,不同粒径煤样的解吸量和解吸率趋于一致;同一煤样在相同条件下解吸速度在最初阶段达到最大值,随着解吸的进行,解吸速度迅速衰减,最后趋于同一个值;同一煤样粒径越小,初始时刻的解吸速度越大;同一煤样温度越高,初始时刻的解吸速度越快。 相似文献
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Enhanced ammonia nitrogen removal using consistent biological regeneration and ammonium exchange of zeolite in modified SBR process 总被引:13,自引:0,他引:13
The modified zeo-SBR is recommended for a new nitrogen removal process that has a special function of consistent ammonium exchange and bioregeneration of zeolite-floc. Three sets of sequencing batch reactors, control, zeo-SBR, and modified zeo-SBR were tested to assess nitrogen removal efficiency. The control reactor consisted of anoxic-fill, aeration-mixing, settling, and decanting/idle phases, meaning that nitrogen removal efficiency was dependent on the decanting volume in a cycle. The zeo-SBR reactor was operated in the same way as the control reactor, except for daily addition of powdered zeolite in the SBR reactor. The operating order sequences in the zeo-SBR were changed in the modified zeo-SBR. Anoxic-fill phase was followed by aeration-mixing phase in the zeo-SBR, while aeration-mixing phase was followed by anoxic-fill phase in the modified zeo-SBR to carry NH4(+)-N over to the next operational cycle and to reduce total nitrogen concentration in the effluent. In the modified zeo-SBR, nitrification and biological regeneration occurred during the initial aeration-mixing phase, while denitrification and ammonium adsorption occurred in the following anoxic-fill phase. The changed operational sequence in the modified zeo-SBR to adapt the ammonium adsorption and biological regeneration of the zeolite-floc could enhance nitrogen removal efficiency. As a result of the continuous operation, the nitrogen removal efficiencies of the control and zeo-SBR were in 68.5-70.9%, based on the 33% of decanting volume for a cycle. The zeo-SBR showed a consistent ammonium exchange and bio-regeneration in the anoxic-fill and aeration-mixing phases, respectively. Meanwhile, the effluent total nitrogen of the modified zeo-SBR showed 50-60 mg N/L through ammonium adsorption of the zeolite-floc when the influent ammonium concentration was 315 mg N/L, indicating the T-N removal efficiency was enhanced over 10% in the same HRT and SRT conditions as those of control and zeo-SBR reactors. The ammonium adsorption capacity was found to be 6-7 mg NH4(+)-N/g FSS that is equivalent to 40 mg NH4(+)-N/L of ammonium nitrogen removal. 相似文献
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利用沸石粉配制高性能混凝土的应用研究 总被引:6,自引:0,他引:6
本文对利用沸石粉与不同细度粉煤灰复合配制的混凝土各项力学性能,耐久性及结构特征进行了分析对比,介绍了混凝土导电量与早期自由收缩的检测方法,并结合沸石结构特征对其改善混凝土的工作性及耐久性的机理进行了探讨。 相似文献