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Comparison of pollutants in stormwater runoff from asphalt and concrete roads 沥青和混凝土道路雨水径流中污染物的比较
IF 1 4区 工程技术 Q4 ENGINEERING, CHEMICAL Pub Date : 2021-09-01 DOI: 10.12989/MWT.2021.12.5.253
Seongbeom Kim, M. Yaqub, Jaehyun Lee, Wontae Lee
Controlling non-point source pollutants (NPSPs) is critical in achieving good surface water quality; the contribution of road runoff has recently received increased attention. This study monitored the runoff characteristics of NPSPs, including suspended solids, particle size distribution, heavy metals, organic matter, and nutrients, from asphalt and concrete roads. Water quality parameters, including biochemical oxygen demand (BOD), chemical oxygen demand (COD), and nutrients of the receiving reservoir, were also investigated. During the first flush, the changes in pollutant concentrations over time were higher on concrete roads than asphalt roads. Concentrations peaked over a short period, while an increased pollutant concentration may be present several days after rain. The runoff concentration and particle size distribution were higher on concrete roads, whereas the concentrations of heavy metals were similar in asphalt and concrete roads. The organic matter concentration of asphalt roads was higher, or identical, to that in the first flush from concrete roads; this may be associated with the road location. Water quality analysis of the reservoir showed relatively good results for BOD, COD, and nutrient concentrations. Road construction was a factor that determined the characteristics of NPSPs in road runoff.
控制非点源污染物是实现良好地表水水质的关键;道路径流的作用最近受到越来越多的关注。本研究监测了npps的径流特征,包括来自沥青和混凝土道路的悬浮固体、粒径分布、重金属、有机物和营养物质。水质参数包括生化需氧量(BOD)、化学需氧量(COD)和接收水库的营养物质。在第一次冲洗期间,混凝土道路的污染物浓度随时间的变化高于沥青道路。浓度在短时间内达到峰值,而污染物浓度在雨后几天可能会增加。混凝土路面的径流浓度和粒径分布较高,而沥青路面和混凝土路面的重金属浓度基本一致。沥青路面的有机质浓度高于或等于混凝土路面的有机质浓度;这可能与道路位置有关。水库水质分析结果显示,BOD、COD、营养物浓度均较好。道路建设是决定npsp在道路径流中的特征的一个因素。
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引用次数: 0
Modeling of biofilm growth and the related changes in hydraulic properties of porous media 多孔介质中生物膜生长及水力特性变化的模拟
IF 1 4区 工程技术 Q4 ENGINEERING, CHEMICAL Pub Date : 2021-09-01 DOI: 10.12989/MWT.2021.12.5.217
Shenjie Shi, Yu Zhang, Q. Tang, Jialin Mo
Pore blocking is considered to dominate the hydraulic conductivity in solute transport processes. Biomass accumulation is effective in reducing the hydraulic conductivity of porous medium. In this paper, the sphere model and the cut-and-random-rejoin-type model were adopted to establish mathematical equations for hydraulic characteristics of porous media caused by biological clogging. A new mathematical correlation was proposed to address the coupling effect of hydraulic, biofilm growth fields on the basis of thorough review on Kozeny-Carman equation relevant researches. The time-dependent solution were investigated with the consideration of a series of different model factors. The study found that there are similar phenomena both in the sphere model and in the cut-and-random-rejoin-type model. When the pores of the porous media are filled with biofilms, the pore volume is continuously reduced, and the porosity of the porous media continues to decrease. Macroscopically, it is manifested as a decrease in permeability. The model image analysis shows that growth of biofilm in a porous medium reduces the total volume and the average size of the pores and directly affects the permeability of pores. But this effect is not permanent, the pores will not be completely blocked, and the permeability will not drop to zero.
孔隙堵塞被认为是溶质运移过程中水力传导的主导因素。生物质积累能有效降低多孔介质的导水率。本文采用球体模型和剪切随机再结合型模型,建立了生物堵塞引起的多孔介质水力特性的数学方程。在全面回顾Kozeny-Carman方程相关研究的基础上,提出了一种新的数学关联式来解决水力、生物膜生长场的耦合效应。在考虑一系列不同的模型因素的情况下,研究了含时解。研究发现,无论是在球体模型中,还是在切割和随机重新连接型模型中,都存在类似的现象。当多孔介质的孔隙被生物膜填充时,孔隙体积不断减小,多孔介质的孔隙率不断降低。宏观上,表现为渗透率下降。模型图像分析表明,生物膜在多孔介质中的生长降低了孔隙的总体积和平均尺寸,并直接影响孔隙的渗透率。但这种影响并不是永久性的,孔隙不会完全堵塞,渗透率也不会降至零。
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引用次数: 0
Prioritizing water distribution pipe renewal based on seismic risk and construction cost 根据地震风险和施工成本优先考虑配水管更新
IF 1 4区 工程技术 Q4 ENGINEERING, CHEMICAL Pub Date : 2021-09-01 DOI: 10.12989/MWT.2021.12.5.195
H. Youn, H. Oh, Dooil Kim
Natural disasters such as earthquakes can cause damage to water distribution pipe, resulting in water interruption. For a contingency plan for earthquakes, calculating the possibility of failure and the consequence of failure are necessary. The empirical formula for the vulnerability of water distribution pipe after earthquake was developed considering deterioration effect with aging in this study. The degree of water outage was assumed to be a consequence of failure. The earthquake risk with pipe aging was obtained through the product of them. Although the risk alone might be used to prioritize pipe network improvement, it was recommended to consider the construction cost as well. It was also proposed to use a score-based method by graphically tabulating construction cost and risk. The methodology proposed was demonstrated on a real-scale water distribution pipe in Korea. The improved prioritization using the scoring method will help create a future earthquake preparedness plan for a water distribution system.
地震等自然灾害会对配水管造成破坏,造成供水中断。对于一个地震应急计划,计算失败的可能性和失败的后果是必要的。考虑老化劣化效应,建立了配水管地震后易损性的经验公式。供水中断的程度被认为是故障的后果。通过二者的乘积,得到了管道老化的地震危险性。虽然风险可以单独用于管网改进的优先级,但建议也考虑建设成本。还提出了采用基于分数的方法,将建筑成本和风险图表化。该方法在韩国的一个实际配水管道上进行了验证。使用评分方法改进的优先级排序将有助于为供水系统制定未来的地震准备计划。
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引用次数: 0
fMWNTs/GO/MnO2 nanocomposites as additives in a membrane for the removal of crystal violet fMWNTs/GO/MnO2纳米复合材料作为膜中去除结晶紫的添加剂
IF 1 4区 工程技术 Q4 ENGINEERING, CHEMICAL Pub Date : 2021-09-01 DOI: 10.12989/MWT.2021.12.5.205
Sabna, S. G. Thampi, S. Chandrakaran, P. SasinaE, P. Resmi
In this work, the performance of a mixed matrix membrane in the removal of crystal violet from aqueous solutions is reported. This membrane was fabricated by adding a nanocomposite (fMWNTs/GO/MnO2 NC) synthesized with functionalized multi-walled carbon nanotubes, graphene oxide, and manganese dioxide nanoparticles, to polysulfone. Details pertaining to the preparation and characterization of the membrane, evaluation of its performance in the removal of crystal violet, and antifouling properties of the membrane are reported in this paper. The membranes were fabricated by embedding varying concentrations of fMWNTs/GO/MnO2 NC (from 0 to 0.3wt%) in the Psf matrix. Incorporation of fMWNTs/GO/ MnO2 NC was found to enhance hydrophilicity, equilibrium water content, porosity, mean pore radius, pure water permeability and antifouling properties of the membrane. Analyses of surface morphology of the fabricated membranes revealed the presence of macro-voids in the matrix of the membrane after addition of fMWNTs/GO/MnO2 NC, resulting in an increase in pure water flux and permeability. It was observed that 0.1wt% is the optimum concentration of fMWNTs/GO/ MnO2 NC in the Psf matrix since the membrane exhibited maximum hydrophilicity, equilibrium water content, porosity, pure water permeability and dye rejection at this concentration. Also, it was observed that the polysulfone membrane exhibited enhanced antifouling properties at this concentration of the nanocomposite.
本文报道了混合基质膜从水溶液中去除结晶紫的性能。该膜是通过将功能化多壁碳纳米管、氧化石墨烯和二氧化锰纳米颗粒合成的纳米复合材料(fMWNTs/GO/MnO2 NC)添加到聚砜中制备的。本文报道了膜的制备、表征、去除结晶紫性能的评价以及膜的防污性能。通过在Psf基质中包埋不同浓度的fMWNTs/GO/MnO2 NC(从0到0.3wt%)来制备膜。fMWNTs/GO/ MnO2 NC的掺入提高了膜的亲水性、平衡含水量、孔隙率、平均孔半径、纯水渗透性和防污性能。通过对制备膜表面形貌的分析发现,添加氧化石墨烯/氧化石墨烯/二氧化锰后,制备膜的基质中出现了较大的空隙,从而提高了纯水通量和渗透率。研究发现,在0.1wt%的pgf基质中,fMWNTs/GO/ MnO2 NC的最佳浓度为0.1wt%,因为在该浓度下,膜具有最大的亲水性、平衡含水量、孔隙率、纯水渗透性和抗染性。此外,我们还观察到,在这种浓度的纳米复合材料下,聚砜膜的防污性能增强。
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引用次数: 0
Application of graphene, graphene oxide, and boron nitride nanosheets in the water treatment 石墨烯、氧化石墨烯和氮化硼纳米片在水处理中的应用
IF 1 4区 工程技术 Q4 ENGINEERING, CHEMICAL Pub Date : 2021-09-01 DOI: 10.12989/MWT.2021.12.5.227
J. Azamat
In this research, we study recent advances in the use of graphene, graphene oxide, and boron nitride nanosheets for the water treatment processes. The perfect nanostructured membranes are impermeable to ions or molecules. Therefore, for using them in the selective separation processes, they should be drilled and so, the created pores will be functionalized using appropriate chemical functional groups. Up to now, numerous research articles have been done on the use of functionalized chemical groups on the nanostructured membranes but the results of those works have not been compared with each other. Therefore, a comprehensive review of the structural property and application of functional groups at the edge of membranes pores was performed. To the best of our knowledge, no review study has been reported in the literature on the effect of functionalized groups on the separation of molecules or ions by nanostructured membranes. This review paper aims to draw the attention of the theoretical as well as the experimental researchers working on the functionalized materials towards the recent developments probing the permeation of various species such as atoms, ions, and small molecules through graphene, graphene oxide, and boron nitride nanosheets.
在本研究中,我们研究了石墨烯、氧化石墨烯和氮化硼纳米片在水处理工艺中的最新进展。完美的纳米结构膜是不渗透离子或分子的。因此,为了在选择性分离过程中使用它们,应该钻孔,这样,所产生的孔将使用适当的化学官能团进行功能化。迄今为止,关于功能化化学基团在纳米结构膜上的应用已有大量的研究,但这些工作的结果并没有相互比较。因此,本文对膜孔边缘官能团的结构性质及其应用进行了综述。据我们所知,目前还没有文献报道功能化基团对纳米结构膜分离分子或离子的影响。本文旨在引起理论和实验研究人员对功能化材料的关注,探讨各种物质(如原子、离子和小分子)通过石墨烯、氧化石墨烯和氮化硼纳米片的渗透的最新进展。
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引用次数: 0
Behavior of nanobentonites in adsorption of cesium and strontium 纳米膨润土吸附铯和锶的行为
IF 1 4区 工程技术 Q4 ENGINEERING, CHEMICAL Pub Date : 2021-09-01 DOI: 10.12989/MWT.2021.12.5.245
Mohammad-Ali Ostovaritalaba, M. Hayati-Ashtiani
Bentonites contain a large amount of montmorillonite and this nano-structured and nano-porous member of the smectite group determines the adsorption properties of bentonites. In this study, four types of Iranian commercial bentonite clays have been examined to determine the adsorption capacity of cesium and strontium. The physicochemical and mineralogical properties of the four types have been experimentally analyzed with the focus on the moisture content, pH, dry (granulometric) and wet screen analyses; swell, sediment and Methylene Blue (M.B.) indices; cation exchange capacity (C.E.C) measurements. The pH and C.E.C values of B3 were 9.48 and 71.9 mEq/100g, respectively. The high values of C.E.C; swell, sediment and M.B. indices along with the high amount of granulometric values (particles finer than 36 um) showed that the B3 had a high amount of montmorillonite. X-Ray Fluorescence (XRF) analysis showed that the major of competing cations such as Ca2+ and K+ existing in B2 affects the Sr adsorption. The experimental analysis also showed that B2 had almost high pH and C.E.C values as well. The results of the separation process of Cs and Sr indicate that the B3 and B2 have the highest adsorption capacity of 59.75 and 45.5 for Cs and Sr adsorption, respectively.
膨润土中含有大量的蒙脱石,这种纳米结构和纳米多孔的蒙脱石基团决定了膨润土的吸附性能。在本研究中,对四种类型的伊朗商品膨润土粘土进行了测试,以确定其对铯和锶的吸附能力。对这四种类型的物理化学和矿物学性质进行了实验分析,重点是水分含量、pH值、干(粒度)和湿筛分析;涌浪、沉积物和亚甲基蓝(M.B.)指数;阳离子交换容量(C.E.C)测量。B3的pH值和C.E.C值分别为9.48和71.9mEq/100g。C.E.C的高价值;溶胀、沉积物和M.B.指数以及大量的粒度值(小于36um的颗粒)表明B3具有大量的蒙脱石。X射线荧光(XRF)分析表明,B2中存在的主要竞争阳离子如Ca2+和K+影响Sr的吸附。实验分析还表明B2具有几乎高的pH值和C.E.C值。Cs和Sr的分离过程的结果表明,B3和B2对Cs的吸附量最高,分别为59.75和45.5。
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引用次数: 0
Consecutive chemical cleanings of hollow fiber ultrafiltration membranes from a pilot-scale surface water treatment plant 中试地表水处理厂中空纤维超滤膜的连续化学清洗
IF 1 4区 工程技术 Q4 ENGINEERING, CHEMICAL Pub Date : 2021-07-01 DOI: 10.12989/MWT.2021.12.4.139
Yong-Gu Lee, Hojung Rho, Sangwon Kim, Jaegwan Shin, Seung-jin Kim, Kangmin Chon
The effects of the order of chemical cleaning protocols on the removal of hollow fiber ultrafiltration (HUF) membrane foulants, and restoration of membrane surface properties, were identified through autopsies of fouled HUF membrane modules from a pilot-scale surface water treatment system (Hongcheon-gun, Kangwon province, Republic of Korea). Quantitative and qualitative differences in the extracted HUF membrane foulants were found to depend on the types of chemical cleaning protocols applied, the consecutive cleaning protocol II (CP II; 0.1 N NaOH -> 0.1 N HCl; the sum of DOC = 215.19 mgC m⁻2; the sum of TN = 17.82 mg N m⁻2; the sum of metals = 25.14 mg m⁻2) extracted both organic and inorganic foulants from HUF membrane surfaces more effectively than consecutive cleaning protocol I (CP I: 0.1 N HCl -> 0.1 N NaOH; the sum of DOC = 189.89 mg C m⁻2; the sum of TN = 13.66 mg N m⁻2; the sum of metals = 9.95 mg m⁻2). Furthermore, the surface morphological characteristics of the cleaned HUF membrane using CP II were relatively similar to the virgin membrane surface compared to those of the cleaned HUF membrane using CP I. These findings demonstrated that the sequential coupling of two different chemical cleaning protocols played critical roles in removing organic and inorganic foulants from the fouled HUF membrane surfaces and restoration of membrane surface elementary composition potentially related to HUF membrane performances.
通过对中试地表水处理系统(韩国江原道洪川郡)中被污染的HUF膜模块进行解剖,确定了化学清洗顺序对去除中空纤维超滤(HUF)膜污染物和恢复膜表面特性的影响。提取的HUF膜污染物的数量和质量差异取决于所采用的化学清洗方案的类型,连续清洗方案II (CP II);0.1 N NaOH -> 0.1 N HCl;DOC总和= 215.19 mgC m毒血症;TN的总和= 17.82 mg N m⁻2;从HUF膜表面提取有机和无机污染物比连续清洗方案I (CP I: 0.1 N HCl -> 0.1 N NaOH)更有效;DOC的总和= 189.89 mg C m毒血症;TN的总和= 13.66 mg N m⁻2;金属总量= 9.95 mg m(2)。此外,使用CP II清洗后的HUF膜的表面形态特征与使用CP i清洗后的HUF膜的表面形态特征相对相似。这些研究结果表明,两种不同化学清洗方案的顺序耦合在去除污染的HUF膜表面的有机和无机污染物以及恢复与HUF膜可能相关的膜表面基本成分方面发挥了关键作用表演。
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引用次数: 2
Removal of short- and long-chain perfluorinated compounds from surface water by coagulation 混凝法去除地表水中的短链和长链全氟化合物
IF 1 4区 工程技术 Q4 ENGINEERING, CHEMICAL Pub Date : 2021-07-01 DOI: 10.12989/MWT.2021.12.4.187
Ji-Won Park, J. Noh, S. Yoon, Samiya, B. Choi, Gyoo-Bum Kim, H. Oh, S. Maeng
Per- and poly-fluorinated compounds (PFCs) are persistently found during drinking water treatment processes, which can also be found in tap water. However, the mechanisms for removing PFCs during drinking water treatment processes have not been fully understood. In this study, we investigated the effect of coagulation on the removal of short- and long-chain PFCs. The PFCs mixture (C5–C10) resulted in a lower removal efficacy via coagulation treatment, and the average removals of selected PFCs were found to be below 5%. Only long-chain perfluorodecanoic acid (PFDA) (C10) and perfluorooctanesulfonic acid (PFOS) were significantly removed via coagulation. The removals of suspended particles and bacterial cells via coagulation were correlated with the reduction of PFDA and PFOS. However, higher turbidity, humic substances, and biopolymers in the source water were found to significantly reduce the removal efficiency of PFDA and PFOS, resulting in insignificant changes between the PFC species. We concluded that coagulation was not effective in removing selected PFCs, hence, a multiple-barrier treatment strategy is needed for PFC removal.
全氟和多氟化合物(PFCs)在饮用水处理过程中一直存在,在自来水中也可以发现。然而,在饮用水处理过程中去除全氟氯化碳的机制尚未完全了解。在本研究中,我们研究了混凝对去除短链和长链PFCs的影响。通过混凝处理,PFCs混合物(C5–C10)的去除效果较低,并且所选PFCs的平均去除率低于5%。只有长链全氟辛酸(PFDA)(C10)和全氟辛烷磺酸(PFOS)通过混凝显著去除。通过混凝去除悬浮颗粒和细菌细胞与PFDA和PFOS的减少相关。然而,发现水源水中较高的浊度、腐殖物质和生物聚合物显著降低了PFDA和PFOS的去除效率,导致PFC物种之间的变化不显著。我们得出的结论是,凝血不能有效去除选定的PFCs,因此,需要采用多重屏障治疗策略来去除PFC。
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引用次数: 2
Copper and nickel removal from plating wastewater in the electrodialysis process using a channeled stack 槽式电渗析工艺去除电镀废水中的铜和镍
IF 1 4区 工程技术 Q4 ENGINEERING, CHEMICAL Pub Date : 2021-07-01 DOI: 10.12989/MWT.2021.12.4.149
K. Min, J. Kim, Sun Wouk Kim, Seunghyung Lee, Hyun-Gon Shin, K. Park
Electrodialysis (ED) is an advanced separation process used to treat industrial wastewater using potential differences. In this study, flow rates within the stack were increased by creating a flow channel to increase the limiting current density (LCD). Increasing the flow rate within the stack increases the diffusion flux, which leads to an increase in LCDs. Experiments show that the applied voltage of the flow-accelerated stack was improved by 12.2% compared to the stack without a flow channel, but the LCD decreased by 3.6%. The removal efficiency of both copper and nickel between the two stacks was greater than 95.6%, with no significant difference. However, the concentration rate of ions was superior in the stack without a flow channel. This may be attributed to the fact that the applied voltage increases when the channel is attached, resulting in differences in the separation rate and the resulting concentration polarization. In terms of the current efficiency, the channel-less stack was found to be 42.5% better than the channeled stack. It would be desirable to apply voltages below the LCDs as those exceeding LCDs at the same membrane flow rate would significantly reduce the economic feasibility.
电渗析(ED)是一种利用电位差处理工业废水的先进分离工艺。在这项研究中,通过创建流动通道来增加极限电流密度(LCD),从而增加了堆内的流速。增加堆内的流速会增加扩散通量,从而导致LCD的增加。实验表明,与没有流道的堆叠相比,流动加速堆叠的施加电压提高了12.2%,但LCD降低了3.6%。两个堆叠对铜和镍的去除率均大于95.6%,没有显著差异。然而,在没有流动通道的堆叠中,离子的浓度速率是优越的。这可能归因于这样一个事实,即当连接通道时,施加的电压增加,导致分离速率和由此产生的浓度极化的差异。就电流效率而言,发现无沟道堆叠比沟道堆叠好42.5%。希望施加低于LCD的电压,因为在相同的膜流速下超过LCD的电压将显著降低经济可行性。
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引用次数: 2
Monosodium glutamate as a draw solute for sewage thickening by forward osmosis–nanofiltration 谷氨酸钠作为提取溶质用于污水正向渗透-纳滤浓缩
IF 1 4区 工程技术 Q4 ENGINEERING, CHEMICAL Pub Date : 2021-07-01 DOI: 10.12989/MWT.2021.12.4.165
Seung-Lyeol Yang, Taaekguen Yun, S. Kwon, Kyungjin Cho, Seongpil Jeong, Seungkwan Hong, Seockheon Lee
Monosodium glutamate (MSG) was evaluated as a draw solute (DS) of forward osmosis–nanofiltration (FO-NF) process for sewage thickening. Water flux (Jw) and reverse draw solute flux (Js) through FO membrane with MSG were compared to those with NaCl as the reference DS. In addition, the influence of MSG to anaerobic digestion of concentrated sewage for methane gas production was investigated. The Js/Jw for MSG was 0.0015mol/L at 1M of initial concentration with a CTA(HTI) membrane, which was 6 % of that for NaCl, while the water flux (Jw) for MSG (ca. 10 L/m2h) was comparable to that for NaCl in FO processes. MSG recovered up to 98% by NF process, which changed with applied membrane and MSG concentration. The collected primary effluent from the full-scale wastewater treatment plant was thickened up to nine times in terms of volumetric concentration factor. The physical membrane flushing by a water could effectively recover the flux. The inhibitory effects of MSG on anaerobic methane production could be negligible and the gas production potential increased.
谷氨酸一钠(MSG)被评估为用于污水浓缩的正渗透-纳滤(FO-NF)工艺的汲取溶质(DS)。将MSG和NaCl作为参比DS的FO膜的水通量(Jw)和反萃取溶质通量(Js)进行了比较。此外,还研究了MSG对甲烷气生产浓污水厌氧消化的影响。在CTA(HTI)膜的初始浓度为1M时,MSG的Js/Jw为0.0015mol/L,是NaCl的6%,而MSG的水通量(Jw)(约10L/m2h)与FO工艺中NaCl的水通量相当。通过NF处理,MSG的回收率高达98%,这随着膜的应用和MSG浓度的变化而变化。从全尺寸污水处理厂收集的一级出水,按体积浓度因子计,其浓度高达9倍。物理膜冲洗可以有效地回收通量。MSG对厌氧产甲烷的抑制作用可以忽略不计,产气潜力增加。
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引用次数: 0
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Membrane Water Treatment
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