共查询到19条相似文献，搜索用时 828 毫秒
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实验以大洋多金属结核浸出渣(66%,质量分数)为主要原料、高岭土(21%)为粘结剂、蛭石(13%)为膨胀剂,研制出用于动态吸附废水中重金属离子的浸出渣颗粒。以造粒后的颗粒为吸附剂动态处理含Cu2 的模拟废水,研究发现溶液浓度、流速、pH值对动态吸附效果的影响,选定浸出渣颗粒动态处理重金属废水的工艺参数:造粒后浸出渣颗粒的比表面积为18.61 m2/g,当模拟废水中Cu2 溶液的初始浓度为27 mg/L、pH=5.35、出口流速为10 ml/h时,每克浸出渣颗粒可动态处理模拟废水114.3 ml,处理后溶液中阳离子的浓度≤0.5 mg/L,实验效果明显。 相似文献
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利用羟基氧化铁对硅藻土进行改性制备复合吸附剂,然后用一次平衡法研究了复合吸附剂对水体中铬酸根的吸附性能。实验结果表明:pH值为1.0,废水中Cr(VI)质量浓度不大于100 mg/L,吸附剂用量为0.5 g,吸附平衡时间为30min左右时,对六价铬的去除率达85%。动力学研究结果表明,Cr(Ⅵ)在复合吸附剂上的吸附动力学可以利用拟二级动力学方程较好的描述。吸附平衡研究结果表明,Cr(Ⅵ)在复合吸附剂上的吸附既可以利用Langmuir模型又可以利用Freundlich模型加以描述,这可能是由于复合吸附剂对Cr(Ⅵ)的吸附既有单层吸附又有多层吸附。 相似文献
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以天然钙基膨润土和燃料废弃物粉煤灰为原料,工业淀粉为致孔剂,采用挤出-滚圆技术,制备了粉煤灰/膨润土复合颗粒吸附剂,并用于含Pb~(2+)溶液的吸附。研究了吸附时间、pH、投样量和溶液初始浓度对吸附性能的影响。结果表明,采用挤出-滚圆法制得的复合颗粒吸附剂大小均匀,表面没有裂纹,具有良好的机械强度。吸附实验中,在投样量10.0 g/L,溶液pH为6,吸附时间120 min,溶液初始浓度100 mg/L时,复合颗粒吸附剂对Pb~(2+)的去除率达到97.40%,吸附量为9.74mg/g。热力学实验表明吸附剂对Pb~(2+)的吸附更符合Langmuir吸附等温模型。 相似文献
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利用粉煤灰处理含铜废水的实验研究 总被引：8，自引：0，他引：8
研究了粉煤灰去除废水中铜离子的速率、粉煤灰投加量对粉煤灰去除废水中铜离子的影响和粉煤灰对质量浓度不同的含铜离子废水的去除效果,进一步探讨了粉煤灰去除铜离子的机理,实验结果显示粉煤灰在去除废水中铜离子的过程中反应3 h后就达到了平衡,粉煤灰对Cu2 的去除率随粉煤灰投加量的增加而增加,但是就充分利用吸附剂粉煤灰的角度而言,并非其投加量越多去除量越大,粉煤灰吸附废水中的铜离子更符合Langmuir模型,而不是Freundlich模型;粉煤灰去除废水中的Cu2 主要是静电吸附、阳离子交换吸附和表面络合吸附作用,但是,当用碱性粉煤灰处理质量浓度较低的含Cu2 废水时,生成Cu(OH)2的沉淀作用可能占主要的地位. 相似文献
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AMA吸附剂吸附铬(Ⅵ)的性能研究及应用 总被引：2，自引：0，他引：2
用凹凸棒石粘土改性制备了AMA吸附剂，对其吸附铬(Ⅵ)的性能进行了较系统地研究。选择了吸附铬(Ⅵ)的最佳条件，用来处理含铬(Ⅵ)废水，铬(Ⅵ)的去除率在96％以上，铬(Ⅵ)的残余浓度小于0．5mg/L，符合国家的排放标准。可以在废水治理中推广应用。 相似文献
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Fenton试剂氧化-微电解-接触氧化法处理丙烯腈废水实验研究 总被引：1，自引：0，他引：1
实验采用Fenton试剂氧化-微电解-接触氧化组合工艺处理丙烯腈废水。研究了各单元工艺的最佳控制参数和操作条件。结果表明,在废水pH值为3左右、反应时间2 h的前提下,双氧水投加量40 mL/L,二价铁离子质量浓度为0.4 g/L,再经过微电解处理后的出水进入接触氧化阶段。在溶解氧为4.5 mg/L左右,水力停留时间为10 h、容积负荷1.0 kg CODCr/（m3·d）左右的条件下,出水CODCr小于100 mg/L,可达到国家对丙烯腈废水处理要求的一级标准。 相似文献
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13X沸石分子筛对水中Hg2+吸附性能的实验研究 总被引：5，自引：0，他引：5
13X沸石分子筛吸附水中Hg2+的实验研究表明,13X沸石在pH值为5~6、时间为20 min、温度为20~30 ℃条件下对Hg2+ 的吸附效果最佳。在13X沸石的用量为4 g/L的条件下对原始浓度为0.2 ~100mg/L的Hg2+进行吸附,吸附量由0.035 6 mg/g增加到21.87 mg/g。13X沸石可使原始浓度为0.01 mg/L的Hg2+降至0.002 mg/L以下。饱和NaCl溶液对吸附Hg2+后的13X沸石解吸效果良好,解吸后的13X沸石循环使用4次,对Hg2+的吸附率仍未降低,表明13X沸石的重复利用效果良好。通过在洗脱Hg2+ 的解吸液中加入Na2S·9H2O,可使Hg2+形成HgS沉淀进行回收,回收率可达90%以上。实验表明,13X沸石适用于对水中低浓度Hg2+的深度净化处理。 相似文献
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N. Nasseh L. Taghavi B. Barikbin M. Khodadadi 《International Journal of Environmental Science and Technology》2017,14(2):251-262
The discharge of industrial effluents containing hexavalent chromium can be very harmful for the environment. Therefore, Cr(VI) should be removed from contaminated water, and especially from wastewater, to prevent its discharge into the environment. This study is aimed at analyzing the factors that affect the removal of Cr(VI) with the use of almond green hull and ash adsorbent. The effects of pH (2–10), adsorbent dose (2–24 g/L), Cr(VI) concentration (10–100 mg/L), exposure time (1–60 min), and temperature (5–50 °C) were examined. The surface morphology, pore size of adsorbent surfaces were characterized with SEM, EDX, FTIR. Maximum removal occurred at pH = 2. Results showed that the removal yield increased with the rise of exposure time and temperature. The data indicate that due to limited site on adsorbent surface, the removal efficiency decreased as initial Cr(VI) concentration increased. When the adsorbent dose was increased, the removal yield increased in the case of the bioadsorbent as well; however, in the ash adsorbent, there was an increase followed by a decreasing trend. The study highlights that almond green hull can be more efficient than its ash in the removal of Cr(VI) from aqueous solution. As a general result of study, it can be argued that almond green hull bioadsorbent and the obtained carbon are able to remove Cr(VI) from aqueous solutions; thus, they can be used as efficient and economical substitutes for existing adsorbents like activated carbon, for the removal of chromium from polluted aqueous solutions. 相似文献
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Experimental Study on Treatment of High-concentrated Sulfur Wastewater by Process of Depositing Natrojarosite and Its Environmental Significance 
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下载免费PDF全文 MA Shengfeng WANG Changqiu LU Anhuai GUO Yanjun HE Hongliao 《《地质学报》英文版》2007,81(2):330-334
High-concentrated sulfur wastewater with sodium and COD （chemical oxygen demand） up to 26000 mg/L from a chemical plant, Jiangsu Province of China has been treated by deposition of natrojarosite in lab. The results indicated that the COD of the wastewater was decreased sharply from 26000 mg/L to 1001 mg/L, with removal rate of COD up to 96% by twice precipitations of natrojarosite and twice oxidation of H202. The treated sulfur wastewater reached the requirement of subsequent biochemical treatment to water quality. The optimal operational parameters should be controlled on pH value between 2.50 and 3.20 and 50 g FeCly6H2O solid added in per liter wastewater. The study provided an experimental basis for pretreatment of high-concentrated sulfur wastewater and proposed a new mineralogical method on treatment of other wastewaters. Depositing process of jarosite and its analogs should be able to be used to treat wastewater from mine and other industries to remove S, Fe and other toxic and harmful elements, such as As, Cr, Hg, Pb, etc. in the water. 相似文献
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Removal of heavy metals from paint industry’s wastewater using Leca as an available adsorbent 总被引：1，自引：1，他引：0
M. Malakootian Ph. D. J. Nouri Ph.D. H. Hossaini 《International Journal of Environmental Science and Technology》2009,6(2):183-190
The ability of light expanded clay aggregate to remove lead and cadmium from paint industry’s effluents was studied at different levels of adsorbent, contact time and pH in April 2008. For this purpose, lead and cadmium removal from paint industry effluents were studied in batch reactors. lead and cadmium measurements have been taken with non-flame atomic absorption techniques and test methods were adapted from 19th. Ed. of standard methods for the examination of water and wastewater. In this study, different amounts of Leca (1, 2, 3, 4, 5, 6, 7, 8, 9 and 10 g/L) were investigated. The amount of adsorbed lead and cadmium exposure to Leca increased from 1.41 to 3 mg/g and 0.22 to 0.75 mg/g, respectively. The maximum removal efficiency for Pb was 93.75 % at pH = 7 and exposure to 10 g/L of Leca, while for cadmium, it was nearly 89.7 % at the same condition. In this study, adsorption process of lead and cadmium was fitted with Freundlich adsorption isotherm (R2 Pb = 0.97 and R2 Cd = 0.98). The sufficient contact time was deemed 1–2 h for lead and cadmium. According to the results, Leca is recommended as a low cost and available adsorbent to remove lead and cadmium from industrial wastewater. 相似文献
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装涂油漆废水的处理工艺研究 总被引：1，自引：0，他引：1
在对微电解、H2O2氧化机理研究的基础上,对装涂油漆废水提出利用微电解-化学氧化法处理的方案,通过实验确定出最佳的微电解反应条件及氧化条件。实验结果表明,该方法可使原水的ρ(CODcr)从4 000 mg/L降至100 mg/L,废水的CODcr去除率>95%,出水达到排放标准。本研究对微电解方案存在的问题进行了分析,并提出部分解决措施。 相似文献
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S. Babel M.Sc. Ph.D. E. M. Opiso 《International Journal of Environmental Science and Technology》2007,4(1):99-107
The possibility of using volcanic ash soils (VAS) or Andisols as a low-cost and natural adsorbent is investigated in this study for the removal of Cr (VI) from synthetic wastewater. Andisols can be used as adsorbent because they are characterized by the presence of non-crystalline secondary minerals such as allophane and imogolite that show variable charge characteristics and have the ability to retain cations and anions. The adsorption of Cr on to two VAS from Mt. Isarog and Mandalagan (B-Horizon), Philippines, was carried out at ambient temperature using batch adsorption studies. The effects of different parameters such as amount of adsorbent, contact time, initial Cr concentration and pH of the solution were investigated. The results showed that the VAS from Isarog is more effective in the removal of Cr than in Mandalagan. The maximum removal efficiency of the Isarog soil for a Cr concentration of 10mg/L reached 89% with a dose of 20 g/L at a moderately acidic pH of 3. The Mandalagan soil on the other hand could remove only 65% at the same pH conditions and parameters. The difference in the removal of the two soils may be attributed to their physico-chemical properties in which the Isarog soil has higher clay content, porosity and lower bulk density. Isarog soil has fine particles with higher surface area and more active non-crystalline minerals and thus has higher removal efficiency than Mandalagan soil. Based on the results, the use of VAS from Isarog appears to be economical and an alternative to commercially available adsorbents for the removal of Cr from contaminated wastewater. 相似文献
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深井水温观测在中国已经开展了20多年,但目前对于水温响应机理的研究还不充分.而且利用温泉水对水温响应机理研究甚少.本文在2008年5月12日汶川8.0级地震前后,即2008年5月1日至7月4日,对重庆北温泉水(距震中约400 km)进行采样监测,发现泉水水温水量发生较大变化:震后水温下降了1℃:海拔相对较高的BWQ-2、BWQ-3、BWQ-4相继断流,监测点BWQ-1的水量增加了15 L/s;与此同时.各泉点Fe~(3+)、Mn~(2+)浓度于地震当日成倍增长,随后逐渐减小,7月4日时浓度与5月1日相当.重庆北温泉位于四川盆地东部边缘地带,受汶川地震强烈影响导致冷水下渗作用,海拔相对较高而温度较低的温泉水改道,并有其他来自裂隙或者地表的低温水汇入温泉含水层,Fe~(3+)、Mn~(2+)浓度的变化从水化学上印证了冷水下渗学说. 相似文献
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Pb and Co removal from paint industries effluent using wood ash 总被引：2，自引：2，他引：0
M. Malakootian Ph.D. A. Almasi Ph.D. H. Hossaini 《International Journal of Environmental Science and Technology》2008,5(2):217-222
The release of heavy metals into the environment is a worldwide major concern. Different studies have demonstrated that natural agents have a high removal capacity for divalent heavy metal ions. Wood ash is a natural adsorbent and, in comparison with others, has a very low price. In this study, the removal of heavy metals (Pb and Co) from Binalood paint industry (Kerman, Iran) effluent was investigated in batch condition. Pb and Co measurement in samples were done with atomic absorption equipment and test methods were adapted from standard methods for the examination of water and wastewater. The effect of pH and the amount of adsorbent was determined and different adsorption isotherms were also obtained. This study shows that the adsorption process follows the adsorption Langmuir isotherm. The amount of wood ash has a great role in the adsorption rate and adsorption rate increased as wood ash increased. In the study, the reactions reached equilibrium in 3 h contact time. The maximum Pb removal efficiency was 96.1 % at pH 2 with a contact time of 3 h and 100 g/L wood ash and the maximum Co removal efficiency was 99 % at pH 2 with a contact time of 3 h and 100 g/L wood ash. According to the results, wood ash is recommended as a low cost and available adsorbent to remove Pb and Co from municipal and industrial wastewaters. 相似文献
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吗啉废水的生化处理工艺 总被引：2，自引：0，他引：2
以含有吗啉、甲基吗啉的高浓度有机废水为研究对象,提出了曝气吹脱-吸附-生物处理的联合工艺,并在室内进行了小试实验。结果表明：原废水经过2次曝气吹脱后,ρ(NH3-N)从62 500 mg/L降为431 mg/L,ρ(COD)从50 840 mg/L降为26 051 mg/L。通过吸附实验,ρ(COD)从26 051 mg/L降为2 769 mg/L,ρ(NH3-N)从412 mg/L降为134 mg/L。在生物处理室内小试实验中,采用了活性污泥反应器与曝气生物滤池相结合的处理工艺。在活性污泥反应系统中,当废水pH为7.5、ρ(DO)为4.3 mg/L、水力停留时间为30 h时,COD的去除率最高,可以达到83.1%。在曝气生物滤池中,当ρ(DO)为3.3 mg/L时,COD去除率最高,达到55.8%。在生物处理的最佳参数条件下进行连续监测,当进水ρ(COD)为2 769 mg/L、出水ρ(COD)平均值为387 mg/L时,COD去除率可达到85.9%。吗啉废水经过此联合工艺的处理,ρ(COD)从50 840 mg/L降为387 mg/L。 相似文献