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Ultrasonic pretreatment for anaerobic digestion of suspended and attached growth sludges 悬浮污泥和附着污泥厌氧消化的超声预处理
IF 2.3 4区 环境科学与生态学 Q2 WATER RESOURCES Pub Date : 2019-11-01 DOI: 10.2166/WQRJ.2019.039
P. Roebuck, K. Kennedy, R. Delatolla
Anaerobic digestion (AD) is a proven technology for energy production from the stabilization and reduction of sewage waste. The AD and impact of ultrasonic pretreatment of four waste activated sludges (WASs) from conventional and three non-conventional municipal wastewater treatment plants were investigated. WAS from a conventional activated sludge (CAS) system, a rotating biological contactor (RBC), a lagoon, and a nitrifying moving-bed biofilm reactor (MBBR) were pretreated with ultrasonic energies of 800–6,550 kJ/kg total solids to illustrate the impact of sludge type and ultrasonic pretreatment on biogas production (BGP), solubilization, and digestion kinetics. The greatest increase in BGP over the control of pretreated sludge did not coincide consistently with greater sonication energy but occurred within a solubilization range of 2.9–7.4% degree of disintegration and are as follows: 5% ± 3 biogas increase for CAS, 12% ± 9 for lagoon, 15% ± 2 for nitrifying MBBR, and 20% ± 2 for RBC. The effect of sonication on digestion kinetics was inconclusive with the application of modified Gompertz, reaction curve, and first-order models to biogas production. These results illustrate the unique response of differing sludges to the same levels of sonication energies. This article has been made Open Access thanks to the kind support of CAWQ/ACQE (https://www.cawq.ca).
厌氧消化(AD)是一项经过验证的技术,用于稳定和减少污水废物的能源生产。研究了超声波预处理4个常规和3个非常规城市污水处理厂废活性污泥(WASs)的AD及影响。采用超声能量为800-6,550 kJ/kg的总固体对来自传统活性污泥(CAS)系统、旋转生物接触器(RBC)、泻湖和硝化移动床生物膜反应器(MBBR)的WAS进行预处理,以说明污泥类型和超声预处理对沼气产生(BGP)、增溶和消化动力学的影响。与预处理污泥对照相比,BGP的最大增加并不与更大的超声能量一致,而是发生在2.9-7.4%的溶解度范围内,具体如下:CAS增加5%±3沼气,泻湖增加12%±9沼气,硝化MBBR增加15%±2沼气,RBC增加20%±2沼气。将改进的Gompertz模型、反应曲线模型和一阶模型应用于沼气生产,超声对消化动力学的影响尚无定论。这些结果说明了不同污泥对相同声波能量水平的独特响应。感谢CAWQ/ACQE (https://www.cawq.ca)的大力支持,本文已开放获取。
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引用次数: 6
Removal of crystal violet dye by a novel adsorbent derived from waste active sludge used in wastewater treatment 新型活性污泥吸附剂去除结晶紫染料的研究
IF 2.3 4区 环境科学与生态学 Q2 WATER RESOURCES Pub Date : 2019-11-01 DOI: 10.2166/WQRJ.2019.049
D. A. Sahbaz, Sahra Dandil, C. Acıkgoz
This study dealt with preparation of the activated carbon derived from active sludge as an adsorbent for the adsorption of crystal violet (CV) from aqueous solution. The waste active sludge was activated chemically with KOH and carbonized to get activated carbon with a large surface area and a high porosity. The activated carbon was characterized by Fourier transform infrared (FTIR) spectroscopy, Brunauer–Emmett–Teller (BET) instrument, and scanning electron microscopy (SEM). Adsorption of CV from aqueous solution onto the activated carbon was investigated under varying conditions, such as adsorbent dosage (1–6 g/L), solution pH (4–9), contact time period (0–150 min), initial dye concentration (20–100 mg/L), and temperature (25–55 °C). 4.0 g/L of adsorbent dosage was chosen as the optimum level due to having a high removal rate (96.2%) (initial CV concentration 60 mg/L; 150 rpm; pH 6; 25 °C). The adsorption kinetic and adsorption isotherms were well described by the pseudo second order kinetic and the Freundlich isotherm model, respectively. The thermodynamic parameters indicated that the adsorption is a spontaneous process and favored at higher temperatures. The results show that the activated carbon derived from active sludge could be employed as a low-cost material for the removal of CV dye.
研究了从活性污泥中提取的活性炭作为吸附水溶液中结晶紫(CV)的吸附剂。利用KOH对废活性污泥进行化学活化,炭化后得到表面积大、孔隙率高的活性炭。采用傅里叶变换红外光谱(FTIR)、布鲁诺尔-埃米特-泰勒(BET)仪和扫描电镜(SEM)对活性炭进行了表征。研究了活性炭在吸附剂用量(1 ~ 6 g/L)、溶液pH(4 ~ 9)、接触时间(0 ~ 150 min)、初始染料浓度(20 ~ 100 mg/L)、温度(25 ~ 55℃)等条件下对CV的吸附作用。选择吸附剂投加量为4.0 g/L,去除率为96.2%(初始CV浓度为60 mg/L;150转;pH值6;25°C)。吸附动力学和等温线分别用拟二级动力学和Freundlich等温线模型描述。热力学参数表明,吸附是一个自发过程,在较高的温度下有利于吸附。结果表明,由活性污泥提取的活性炭可作为一种低成本的材料用于去除CV染料。
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引用次数: 18
Numerical investigation on the impact of wind-induced hydraulics on dissolved oxygen characteristics in a shallow stormwater pond 风致水力学对浅层雨水池溶解氧特性影响的数值研究
IF 2.3 4区 环境科学与生态学 Q2 WATER RESOURCES Pub Date : 2019-11-01 DOI: 10.2166/WQRJ.2019.002
Liyu Chen, P. D'Aoust, C. Rennie, Alexandre J. Poulain, F. Pick, Ru Wang, R. Delatolla
Stormwater ponds (SWPs) are widely utilized for flood and water quality control. Low-flow rates are common in SWPs, sometimes causing wind-driven currents to become the dominant hydrodynamic force during ice-free periods. Hence, it is essential to understand the influence of the wind-induced flow on stratification and dissolved oxygen (DO) concentrations in shallow SWPs to predict the performance and water quality of these systems. The objective of this study is to evaluate the influence of wind-driven circulation on the spatial distribution of DO in an SWP using a numerical model. A bottom-mounted acoustic Doppler current profiler (ADCP) was utilized to measure small wind-induced currents and to validate a hydrodynamic model, which suggested that a wind-dominated circulation was generated even with the moderate wind speed. Countercurrents opposite in the direction to surface wind-generated flow were also present. The DO model demonstrated that complete mixing can be produced by higher wind speed, leading to fully oxic conditions throughout the water column (7.00 mg/L DO or higher), wherein low DO water at depth was carried to the surface by upwelling circulation and was possibly replenished during the surface transportation. This sheds some light on the impact of wind-induced mixing on the water quality in shallow SWPs.
雨水池(SWP)被广泛用于洪水和水质控制。低流速在SWP中很常见,有时会导致风驱动的水流在无冰期成为主要的水动力。因此,了解风致流对浅层SWP中分层和溶解氧(DO)浓度的影响对于预测这些系统的性能和水质至关重要。本研究的目的是使用数值模型评估风力循环对SWP中DO空间分布的影响。底部安装的声学多普勒海流剖面仪(ADCP)用于测量小的风致海流,并验证流体动力学模型,该模型表明,即使在中等风速下,也会产生以风为主的环流。还出现了与表面风产生的气流方向相反的逆流。DO模型表明,更高的风速可以产生完全的混合,从而在整个水柱中产生完全的毒性条件(7.00 mg/L DO或更高),其中深度处的低DO水通过上升流循环被带到地表,并可能在地表输送过程中得到补充。这为风致混合对浅层SWP水质的影响提供了一些线索。
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引用次数: 5
Manganese removal processes at 10 groundwater fed full-scale drinking water treatment plants 10个地下水供水的全尺寸饮用水处理厂的除锰工艺
IF 2.3 4区 环境科学与生态学 Q2 WATER RESOURCES Pub Date : 2019-11-01 DOI: 10.2166/WQRJ.2019.006
I. L. Breda, L. Ramsay, D. A. Søborg, R. Dimitrova, P. Roslev
Manganese (Mn) removal in drinking water filters is facilitated by biological and physico-chemical processes. However, there is limited information about the dominant processes for Mn removal in full-scale matured filters with different filter materials over filter depth. Water and filter material samples were collected from 10 full-scale drinking water treatment plants (DWTPs) to characterise the Mn removal processes, to evaluate the potential use of enhancers and to gain further insight on operational conditions of matured filters for the efficient Mn removal. The first-order Mn removal constant at the DWTPs varied from 10−2 to 10−1 min−1. The amount of Mn coating on the filter material grains showed a strong correlation with the amount of iron, calcium and total coating, but no correlation with the concentration of ATP. Inhibition of biological activity showed that Mn removal in matured filters was dominated by physico-chemical processes (59–97%). Addition of phosphorus and trace metals showed limited effect on Mn removal capacity, indicating that the enhancement of Mn removal in matured filters is possible but challenging. There was limited effect of the filter material type (quartz, calcium carbonate and anthracite) on Mn removal in matured filters, which can be relevant information for the industry when assessing filter designs and determining returns of investments. This article has been made Open Access thanks to the kind support of CAWQ/ACQE (https://www.cawq.ca).
生物和物理化学过程促进了饮用水过滤器中锰的去除。然而,关于全尺寸成熟过滤器中不同过滤材料和不同过滤深度的锰去除主要过程的信息有限。从10个全尺寸饮用水处理厂(DWTP)收集水和过滤材料样本,以表征除锰过程,评估增强子的潜在用途,并进一步了解有效除锰的成熟过滤器的操作条件。DWTP的一阶Mn去除常数在10−2到10−1 min−1之间变化。过滤材料颗粒上Mn涂层的量与铁、钙和总涂层的量呈正相关,但与ATP浓度无关。对生物活性的抑制表明,成熟过滤器中的锰去除主要由物理化学过程控制(59–97%)。添加磷和微量金属对Mn去除能力的影响有限,表明在成熟的过滤器中提高Mn去除能力是可能的,但具有挑战性。过滤材料类型(石英、碳酸钙和无烟煤)对成熟过滤器中锰去除的影响有限,这可能是行业在评估过滤器设计和确定投资回报时的相关信息。由于CAWQ/ACQE的大力支持,本文已被开放获取(https://www.cawq.ca)。
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引用次数: 8
Development of PANI/BN-based absorbents for water remediation 聚苯胺/溴基水处理吸附剂的研制
IF 2.3 4区 环境科学与生态学 Q2 WATER RESOURCES Pub Date : 2019-11-01 DOI: 10.2166/WQRJ.2019.048
M. Arsalan, Azka Awais, Tingting Chen, Qinglin Sheng, Jianbin Zheng
In this research, novel PANI/BN-based absorbent was prepared by bonding polyaniline and bentonite for water remediation and their structures were characterized by scanning electron microscopy (SEM) and Fourier transform infrared spectroscopy (FTIR). The effect of pH, concentration of metal, and dosage amount on synthesized novel PANI/BN-based absorbent was investigated in detail. The result indicated that the PANI/BN-based absorbent has an excellent adsorption performance towards Cu, Pb, and Ni, and the highest binding capacity of 130 mg g−1 for Ni was obtained under normal conditions. The adsorption of PANI/BN absorbent was found to depend on pH when pH < 7.0, but the adsorption has been found independent from the ionic bond effect. The adsorption at optimum pH for Cu (pH 6) and Pb (pH 5) was observed as 85 mg g−1 and 105 mg g−1, respectively. The best results collected at those conditions of isotherm data and adsorption kinetics are represented by the Langmuir model and pseudo-second order equation, respectively. Thermodynamic results (ΔH > 0, ΔS > 0, ΔG < 0) showed that the adsorption process of Cu, Ni, and Pb is significantly increased by the synthesized novel PANI/BN-based absorbent.
本研究采用聚苯胺与膨润土键合制备了新型聚苯胺/苯胺基吸附剂,并用扫描电镜(SEM)和傅里叶变换红外光谱(FTIR)对其结构进行了表征。研究了pH、金属浓度、投加量对合成新型聚苯胺/溴基吸附剂的影响。结果表明,PANI/ bn基吸附剂对Cu、Pb和Ni具有优异的吸附性能,在正常条件下对Ni的吸附能力最高可达130 mg g−1。当pH < 7.0时,发现聚苯胺/氮化硼吸附剂的吸附与pH有关,但发现吸附与离子键效应无关。在最适pH下,Cu (pH 6)和Pb (pH 5)的吸附量分别为85 mg g−1和105 mg g−1。等温线数据和吸附动力学的最佳结果分别用Langmuir模型和拟二阶方程表示。热力学结果(ΔH >, ΔS >, ΔG < 0)表明,合成的新型PANI/ bn基吸附剂对Cu、Ni、Pb的吸附过程明显加快。
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引用次数: 8
Application of waste Delonix regia pods and leaves for the sorption of Pb(II) ions from aqueous solution: kinetic and equilibrium studies 废龙葵豆荚和废龙葵叶吸附水溶液中Pb(II)离子:动力学和平衡研究
IF 2.3 4区 环境科学与生态学 Q2 WATER RESOURCES Pub Date : 2019-11-01 DOI: 10.2166/WQRJ.2019.045
B. Babalola, A. O. Babalola, H. O. Adubiaro, O. Ayanda, S. Nelana, E. B. Naidoo
The removal of Pb(II) ions from synthetic wastewater using Delonix regia pods and leaves as low-cost biosorbents was investigated. The elemental, morphological and phase characterization of Delonix regia pods and leaves were examined before and after biosorption. The adsorption process at various pH values, contact times, initial concentration of Pb(II) ions and adsorbent doses was studied with the aim of investigating the consequences of these parameters on the process of biosorption. The Langmuir adsorption isotherm provided the best fit for the experimental data of the pods while the Freundlich isotherm gave a better fit for the leaves of Delonix regia. The optimum adsorption capacity of 30.27 mg/g for the pods and 27.60 mg/g for the leaves was achieved when 0.5 g of the adsorbent was mixed with 20 mL of 1,000 mg/L Pb(II) ions solution for 30 min at 21 ± 2 °C and a stirring speed of 18 rpm. The data obtained from the time-dependent experiment of the biosorbents followed the pseudo-second-order kinetic model. This study showed that Delonix regia pods and leaves could be developed further as a low-cost sorbent that could be harnessed for removing Pb from industrial wastewater and thus limit water pollution from point sources.
研究了龙葵豆荚和龙葵叶作为低成本生物吸附剂对合成废水中Pb(II)离子的去除效果。研究了生物吸附前后龙葵豆荚和叶片的元素、形态和物相特征。研究了不同pH值、接触时间、Pb(II)离子初始浓度和吸附剂剂量对生物吸附过程的影响。Langmuir吸附等温线和Freundlich吸附等温线对龙参叶片的吸附数据拟合较好。当0.5 g吸附剂与20 mL 1,000 mg/L Pb(II)离子溶液在21±2℃、18 rpm搅拌下混合30 min时,豆荚的最佳吸附量为30.27 mg/g,叶片的最佳吸附量为27.60 mg/g。生物吸附剂随时间变化的实验数据符合准二级动力学模型。本研究表明,龙葵豆荚和龙葵叶可以作为一种低成本的吸附剂进一步开发,用于去除工业废水中的铅,从而限制点源水污染。
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引用次数: 8
Eutrophication 富营养化
IF 2.3 4区 环境科学与生态学 Q2 WATER RESOURCES Pub Date : 2019-09-13 DOI: 10.1007/978-3-030-23335-8_15
Claude E. Boyd
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引用次数: 0
An Overview of Hydrology and Water Supply 水文与供水概论
IF 2.3 4区 环境科学与生态学 Q2 WATER RESOURCES Pub Date : 2019-09-13 DOI: 10.1007/978-3-319-17446-4_2
C. Boyd
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引用次数: 3
Sulfur
IF 2.3 4区 环境科学与生态学 Q2 WATER RESOURCES Pub Date : 2019-09-13 DOI: 10.1007/978-3-030-23335-8_16
Claude E. Boyd
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引用次数: 0
Phosphorus
IF 2.3 4区 环境科学与生态学 Q2 WATER RESOURCES Pub Date : 2019-09-13 DOI: 10.1007/978-3-030-23335-8_14
Claude E. Boyd
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引用次数: 0
期刊
Water Quality Research Journal
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