共查询到20条相似文献,搜索用时 218 毫秒
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水体中氟离子超标严重危害人们的健康,为了寻求廉价、高效的氟离子吸附剂,本文通过共沉淀-焙烧的方法制备了铁铝复合金属氧化物吸附剂,并将之应用于氟离子废水的吸附。探讨了氧化物配比、吸附时间、吸附剂投加量、溶液初始浓度、溶液p H等因素对氟离子吸附效果的影响。结果表明:当铁铝复合氧化物中铁氧化物与铝氧化物摩尔比为1∶2,氟离子溶液初始浓度100 mg/L,固液比为4 g/L,溶液p H为6.0,吸附时间为30 min时,该吸附剂对氟离子的吸附效果最佳,此时氟离子的去除率为92.5%。 相似文献
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利用硫酸铝和硫酸镁改性沸石来进行含磷废水的处理,通过正交试验得出最佳的沸石改性条件为:沸石、硫酸铝、硫酸镁=8∶2∶1(质量比),400℃下焙烧4 h,改性后的沸石相对于未改性的沸石对磷的去除效果提高了20%。探讨了改性沸石投加量、吸附时间、pH、初始浓度对除磷率的影响,并对改性沸石进行了正交试验研究,结果表明:改性沸石除磷的最佳条件:吸附时间70 m in、pH为6.5、投加量4 g、初始浓度为1.5 mg/L。 相似文献
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Fenton氧化法深度处理制革废水生化出水试验研究 总被引:2,自引:0,他引:2
采用Fenton氧化法深度处理以制革废水为主的园区生化处理出水,试验表明:影响Fenton氧化的因素从大到小依次为H2O2投加量、Fe2+浓度、pH、反应时间。当进水CODCr平均为116.6mg/L时,在H2O2投加量50mmol/L、Fe2+投加量10mmol/L、pH为3、反应时间60min的最佳条件下,出水CODCr平均为31.7mg/L;在H2O2投加量25mmol/L、Fe2+投加量7.5mmol/L、pH为5、反应时间40min的经济运行条件下,出水CODCr平均为46.6mg/L。经济条件下的运行成本比最佳条件下的运行成本可节约2.3元/m3。 相似文献
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两级中和沉淀-混凝工艺处理高浓度含氟废水试验研究 总被引:5,自引:0,他引:5
高浓度酸性氟磷废水回用处理中,一级处理后的低浓度含氟废水如采用传统活性氧化铝工艺存在操作管理复杂等问题.以某磷肥厂为例,提出了两级中和沉淀-混凝吸附工艺,并通过试验研究了中和沉淀及混凝的药剂投加种类及投加量,同时考察了pH及搅拌速度等因素对除氟的影响.研究结果表明当进水中F-为178~190 mg/L、PO3-4为146~155 mg/L、pH为2~4.2时,一级和二级中和药剂采用CaO,投加量分别为2.5 g/L和1.2 g/L;出水可达到F-≤10 mg/L、P3-4≤0.6mg/L、SS≤70 mg/L,在聚氯化铝投加量为1.5 g/L及pH为7.5的条件下,经进一步混凝吸附后,出水可达到F-≤1 mg/L、P3-4≤0.6 mg/L、SS≤70 mg/L,满足了回用水的要求,并具有抗冲击负荷能力强,处理效果稳定,操作管理简便及运行经济等优点. 相似文献
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采用颗粒活性炭、粉末活性炭和活性炭负载壳聚糖对高锰地下水进行静态吸附试验,利用颗粒活性炭进行动态吸附试验,研究了静态条件吸附剂投加量、pH值、温度对吸附效果的影响,以及动态条件下浓度和流速对吸附效果的影响。结果表明,三种吸附剂吸附效果相差不大,相对而言粉末活性炭效果最好,颗粒活性炭效果与粉末活性炭较接近;静态试验中,当水中Mn2+的浓度为5mg/L时,水温25℃,pH值为6.8~7.0状态下颗粒活性碳的处理效果最好,最佳投加量为0.02g/L,即0.4g(GAC)/mg(Mn2+);动态条件下,锰离子浓度的增加、流速增大都会使初始穿透点提前。 相似文献
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Alum sludge refers to the by-product from the processing of drinking water in water treatment works. In this study, groups of batch experiments were designed to identify the characteristics of dewatered alum sludge for phosphorus adsorption. Air-dried alum sludge (moisture content 10.2%), which was collected from a water treatment works in Dublin, was subjected to artificial P-rich wastewater adsorption tests using KH2PO4 as a model P source. Adsorption behaviours were investigated as a function of amount and particle size of alum sludge, pH of solution and adsorption time. The results have shown that pH plays a major role not only in the adsorption process but also in the adsorption capacity. With regard to adsorption capacity, this study reveals the Langmuir adsorption isotherm being the best fit with experimental data (R2 = 0.98-0.99). The maximum adsorption capacities range from 0.7 to 3.5 mg-P/g when the pH of the synthetic P solution was varied from 9.0 to 4.3, accordingly. The outcome of this study indicated that alum sludge is suitable for use as an adsorbent for removal of phosphate from wastewater. 相似文献
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锰砂与粉末活性炭对印染废水脱色的研究 总被引:5,自引:0,他引:5
利用除铁用锰矿砂(PGM)为处理剂进行罗丹明B与甲基橙模拟废水的静态脱色试验,并与粉末活性炭(PAC)进行对比。结果表明:PAC与染料的作用机理是物理吸附,脱色率受pH影响较小,对甲基橙和罗丹明B分别符合Langmuir和Freundlich方程。PGM在酸性条件下对染料的脱色是氧化与吸附的综合作用,较低的pH、较高的投量和恰当的反应时间可提高PGM的脱色效能,pH是影响PGM脱色能力的关键因素,pH=1.2时,符合Langmuir方程。酸性条件下较大的吸附容量和较短的平衡时间使PGM有可能应用于染料废水深度处理。 相似文献
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河流水体中的含磷营养物质与较细颗粒的悬移质泥沙发生吸附作用,将对水质循环过程产生影响。基于拟合磷与泥沙颗粒吸附过程的Langmuir方程和修正Langmuir方程分别推导了计算颗粒态磷(PP)和溶解态磷(DP)的计算公式。并采用香溪河泥沙样品的磷吸附实验数据和野外观测数据验证了推导公式,计算结果与实测值符合良好。研究结果表明:当悬移质泥沙浓度较低时,可采用线性吸附方程近似计算颗粒态和溶解态磷浓度,但当悬移质泥沙浓度较高时,需要采用本研究推导的计算公式,特别是解吸和吸附现象并存时,需要使用基于修正的Langmuir模型推导的计算式。研究成果可用于水质或水生态模型建模。 相似文献
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对甘蔗渣进行了吸附去除印染废水中的中性红模拟实验研究。考察了甘蔗粉用量、pH、吸附时间、中性红初始浓度和温度等因素对吸附效果的影响,探究了其吸附动力学及吸附规律。结果表明,甘蔗粉用量、pH、吸附时间和中性红初始浓度、温度等因素对甘蔗粉吸附水中中性红有显著影响。适宜的吸附条件为:甘蔗粉用量0.6g/100mL,pH6.0~7.0,吸附时间60min,初始浓度100mg/L,温度30℃。在该条件下,中性红的去除率达91%以上。甘蔗粉对中性红的吸附过程可以用Langmuir、Temkin等温吸附方程和二级吸附速率方程进行很好的描述,主要表现为物理吸附。 相似文献
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Hui-fang Wu Jun-ping Wang Er-gao Duan Wen-hua Hu Yi-bo Dong Guo-qing Zhang 《水科学与水工程》2020,13(3):193-201
Phosphorus adsorption tests were carried out using poly-aluminum chloride sludge (PACS), which was collected from a water treatment plant in Nanjing. The amount of phosphorus adsorbed by PACS increased quickly within the first hour and reached equilibrium after about 48 h. The adsorption behavior of PACS for phosphorus is consistent with the Langmuir adsorption isotherm equation (R2 > 0.99) and parallel first-order kinetic equation (R2 > 0.98). With the increase of the PACS concentration, the adsorption capacity of PACS for phosphorus decreased, and the removal rate increased. The results of batch tests showed that the adsorption capacities of PACS for phosphorus ranged from 1.64 to 1.13 mg/g when the pH value varied from 4 to 10. However, the adsorption capacity of PACS was not evidently influenced by temperature. In comparison with the ion exchange resin, the adsorption capacity of PACS was barely inhibited by competitive ions, such as , , and Cl−. The PACS surface after adsorption became smooth, and the vibration peaks of Al–O and Al–OH shifted. Both HCl and NaOH have a strong desorption effect on PACS after adsorption saturation, and with higher concentrations of HCl and NaOH, the desorption effect was stronger. Results of column adsorption experiments showed that with lower phosphorus and hydraulic loads, the adsorption column took longer to reach saturation. This indicated that PACS could be used as an efficient material for removal of phosphorus from water. This study provides a new treatment method with PACS. 相似文献
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Large quantities of sludge are produced during water treatment processes. Recently, sludge has been treated as waste and disposed of in landfills,which increases the environmental burdens and the operational cost. Therefore, sludge reuse has become a significant environmental issue. In this study, adsorption of copper ions(Cu~(2+)) onto calcined sludge was investigated under various operational conditions(with varying temperature, Cu~(2+)initial concentration, pH, and sludge dosage). The prepared sludge material was characterized with transmission electron microscopy(TEM), X-ray diffraction(XRD), dynamic light scattering(DLS), and Brunauer-Emmett-Teller(BET) surface area. The sorption capacity of sludge was directly proportional to the initial Cu~(2+) concentration and inversely proportional to the sludge dosage. The optimum operational pH and solution temperature were 6.6 and 80℃, respectively. The experimental results followed a Langmuir isotherm and pseudo-first-order adsorption kinetics.Thermodynamic parameters such as activation energy, change in free energy, enthalpy, and entropy were calculated. Thermodynamic analyses indicated that the sorption of copper ions onto the calcined sludge was driven by a physical adsorption process. The prepared sludge was proven to be an excellent adsorbent material for the removal of Cu~(2+) from an aqueous solution under optimum conditions. 相似文献
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以煤质活性炭(CAC)为吸附剂,吸附水溶液中Cr(Ⅵ)和As(Ⅲ)。研究了pH值、温度、吸附时间和活性炭投加量等因素对活性炭去除Cr(Ⅵ)和As(Ⅲ)效果的影响。结果表明,Cr(Ⅵ)和As(Ⅲ)最佳吸附的pH值分别为2和5,且pH值对吸附率的影响较大。Cr(Ⅵ)的吸附受温度影响较大,当温度从20℃增加到40℃,吸附率由70%提高到了95%;As(Ⅲ)的吸附随温度的升高先增加后减少,其最佳吸附温度为30℃。Langmuir吸附等温式能够很好地拟合Cr(Ⅵ)和As(Ⅲ)的实验数据,而Pseudo second order模型则较好描述了Cr(Ⅵ)和As(Ⅲ)的吸附动力学。Cr(Ⅵ)和As(Ⅲ)吸附的热力学研究表明,该吸附是一个自发进行的自然吸热过程。 相似文献
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利用从活性污泥中分离、纯化、筛选得到的霉菌,进行吸附水体中Cr(Ⅵ)、Cd(Ⅱ)离子研究。结果表明:在Cr(Ⅵ)、Cd(Ⅱ)质量浓度分别为300mg/L时,菌种生长良好。吸附水体中Cr(Ⅵ)、Cd(Ⅱ)的最佳条件:pH值5.0,时间1h,温度10℃。吸附规律符合Langmuir等温吸附模型,由回归方程得到Cr(Ⅵ)的表观最大吸附量为14mg/g;Cd(Ⅱ)的表观最大吸附量为52mg/g。对菌种吸附低温水体中两种重金属离子时pH值变化影响及其吸附动力学进行了研究。证明该菌可以有效地去除低温水体中Cr(Ⅵ)、Cd(Ⅱ)离子。 相似文献
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The particle size of sediment is one of the main factors that influence the phosphorus physical adsorption on sediment. In order to eliminate the effect of other components of sediment on the phosphorus physical adsorption the sediment mineral matrices were obtained by removing inorganic matter metal oxides, and organic matter from natural sediments, which were collected from the Nantong reach of the Yangtze River. The results show that an exponential relationship exists between the median particle size (D50) and specific surface area (Sg) of the sediment mineral matrices, and the fine sediment mineral matrix sample has a larger specific surface area and pore volume than the coarse sediment particles. The kinetic equations were used to describe the phosphorus adsorption process of the sediment mineral matrices, including the Elovich equation, quasi-first-order adsorption kinetic equation, and quasi-second-order adsorption kinetic equation. The results show that the quasi-second-order adsorption kinetic equation has the best fitting effect. Using the mass conservation and Langmuir adsorption kinetic equations, a formula was deduced to calculate the equilibrium adsorption capacity of the sediment mineral matrices. The results of this study show that the phosphorus adsorption capacity decreases with the increase of D50, indicating that the specific surface area and pore volume are the main factors in determining the phosphorus adsorption capacity of the sediment mineral matrices. This study will help understand the important role of sediment in the transformation of phosphorus in aquatic environments. 相似文献