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Occurance and control of manganese in a large scale water treatment plant

Youjun CHEN,Feng XIAO,Yongkang LIU,Dongsheng WANG,Ming YANG,Hua BAI,Jiong ZHANG

《环境科学与工程前沿（英文）》 2015年第9卷第1期页码 66-72 doi: 10.1007/s11783-014-0637-1

摘要： The continuous variations of dissolved oxygen (DO), manganese (Mn), pH, and their effect on manganese removal by different water treatment processes are investigated. The results show that the declined DO concentration and pH value in the bottom of reservoir results in the increasing release of Mn from sediment to source water. Manganese concentration increased from 0.1 to 0.4 mg·L under the condition that DO concentration decreased from 12.0 to 2.0 mg·L in raw water. The different water treatment processes exhibited different efficiency on manganese removal. The processes with recycling of the suspended sludge, low elevation velocity in settling tank and slow filter rate, will benefit the manganese removal. During a high release of manganese in raw water, traditional coagulation-sedimentation and filtration could not completely remove Mn, although granular activated carbon filtration (GAC) had been applied. At that case, preoxidation with chlorine or potassium permanganate (KMnO ) was necessary to address the high manganese concentration.

关键词： manganese release dissolved oxygen settling filtration pre-oxidation

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Mechanism on minimization of excess sludge in oxic-settling-anaerobic (OSA) process

WANG Jianfang, ZHAO Qingliang, JIN Wenbiao, LIN Jikan

《环境科学与工程前沿（英文）》 2008年第2卷第1期页码 36-43 doi: 10.1007/s11783-008-0001-4

摘要： The oxic-settling-anaerobic (OSA) process is a promising wastewater treatment technique for efficiently reducing sludge production and improving the stability of process operation. In this paper, the possible factors of sludge reduction such as sludge decay, uncoupled metabolism, and anaerobic oxidation with low sludge production were discussed in the OSA process. It has been confirmed that sludge decay is the decisive cause in the OSA process, accounting for 66.7% of sludge production reduction. Sludge decay includes hydrolysis and acidogenesis of dead microorganisms and particle organic carbon adsorbed in sludge floc and endogenous metabolism. By batch experiments, it has been proven that there is energetic uncoupling in the OSA system since microorganisms were exposed to alternative anaerobic and aerobic environment. It accounts for about 7.5% of sludge production reduction. Soluble chemical oxygen demand (SCOD) released from the anaerobic sludge tank in the OSA process was used as the substrate for cryptic growth. The substrate was used for anoxic denitrifying, anaerobic phosphorus release, sulfate reduction, and methane production. These anaerobic reactions in the sludge anaerobic tank have lower sludge production than in the aerobic oxidation when equivalent SCOD is consumed, which may lead to approximately 23% of sludge reduction in the OSA process. It has been concluded that multiple causes resulted in the minimization of excess sludge in the OSA system. The microbial community structure and diversity of sludge samples from the CAS (conventional activated sludge) and OSA systems were investigated by 16 SrDNA PCR-DG-DGGE (polymerase chain reaction-double gradient-denaturing gradient gel electrophoresis). DGGE profile and cluster analysis showed more abundant species in the OSA system contrasting to microbial communities in the CAS system.

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Characterization of particle deposition during crossflow filtration as influenced by permeate flux andcrossflow velocity using a microfluidic filtration system

Hongzhan Di, Gregory J. O. Martin, Dave E. Dunstan

《化学科学与工程前沿（英文）》 2021年第15卷第3期页码 552-561 doi: 10.1007/s11705-020-1962-5

摘要： Particle deposition during crossflow filtration is significantly influenced by the operating conditions, in particular the permeate flux and crossflow velocity. However, there is a lack of detailed knowledge about how deposit layer structures and distributions depend on operating parameters. This study uses a microfluidic visualisation filtration system to examine the influence of operating conditions on the deposition process during crossflow ultrafiltration from a microscopic perspective. Increasing the permeate flux caused an increasing amount of deposition and a thicker deposit layer. Higher crossflow velocities reduced the extent of deposition. The degree of deposition varied over a range of operating conditions due to the altered hydrodynamic forces exerted on the particles, which can be examined by the deposition probability according to an existing model. Building on this, an empirical correlation between the deposition probability and volume of deposition as function of filtration time was developed, which gave good agreement with experimental results. The effect of solution conditions was also involved in this correlation as a interaction energies. This could be useful for predicting the dynamic deposition process during crossflow filtration over a range of operating and solution conditions.

关键词： particle deposition crossflow filtration microfluidics confocal microscopy

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Removal of virus aerosols by the combination of filtration and UV-C irradiation

《环境科学与工程前沿（英文）》 2023年第17卷第3期 doi: 10.1007/s11783-023-1627-y

摘要：

● The removal of virus aerosols by filtration and UV-C irradiation was proposed.

关键词： Filtration system UV-C irradiation Virus aerosol Public health COVID-19

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Enhanced cross-flow filtration with flat-sheet ceramic membranes by titanium-based coagulation for membrane

《环境科学与工程前沿（英文）》 2022年第16卷第8期 doi: 10.1007/s11783-022-1531-x

摘要：

• Ceramic membrane filtration showed high performance for surface water treatment.

关键词： Ceramic membrane Coagulation Polytitanium chloride Membrane fouling

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Membrane fouling control by ultrasound in an anaerobic membrane bioreactor

SUI Pengzhe, WEN Xianghua, HUANG Xia

《环境科学与工程前沿（英文）》 2007年第1卷第3期页码 362-367 doi: 10.1007/s11783-007-0062-9

摘要： In this study, ultrasound was used to control the membrane fouling online in an anaerobic membrane bioreactor (AMBR). Short-term running experiments were carried out under different operating conditions to explore feasible ultrasonic parameters. The experimental results indicated that when the crossflow velocity was more than 1.0 m/s, membrane fouling could be controlled effectively only by hydrodynamic methods without ultrasound. When ultrasound was applied, an ultrasonic power range of 60–150 W was suitable for the membrane fouling control in the experimental system. The experimental results showed that the membrane fouling was controlled so well that membrane filtration resistance (Σ) could stay at 5 × 10 m for more than a week with the crossflow velocity of 0.75 m/s, which equaled the effect of crossflow velocity of more than 1.0 m/s without ultrasound.

关键词： membrane filtration filtration resistance different feasible ultrasonic anaerobic membrane

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and computational assessment of 1,4-Dioxane degradation in a photo-Fenton reactive ceramic membrane filtration

《环境科学与工程前沿（英文）》 2021年第15卷第5期 doi: 10.1007/s11783-020-1341-y

摘要：

• 1,4-Dioxane was degraded via the photo-Fenton reactive membrane filtration.

关键词： Photo-Fenton Ceramic membrane 1 4-Dioxane Goethite

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面向未来饮用水净化的OSRO技术——基于河岸过滤的一步反渗透技术 Perspective

Yujia Zhai, 刘刚, Walter G.J. van der Meer

《工程（英文）》 2022年第9卷第2期页码 27-34 doi: 10.1016/j.eng.2021.02.015

摘要：本文介绍了一种由河岸过滤（riverbank filtration, RBF）和反渗透（reverse osmosis, RO）组成的一步反渗透（one-step reverse osmosis, OSRO人工滤池（artificial bank filtration, ABF）与砂滤系统相结合，起到人工补给的作用，是OSRO概念中RBF的替代方案，用于从当地可用资源中供应饮用水。

关键词：饮用水处理河岸过滤反渗透人工滤池水资源回收和再利用

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长纤维高速过滤器的深层过滤过程与特性

王世和,周飞,鄢璐

《中国工程科学》 2009年第11卷第2期页码 43-47

摘要：

以自行开发的长纤维高速过滤器为对象，通过在净水厂长期的过滤试验，从过滤器床层孔隙分布、床层内滤液浓度及各层比积泥量和水头损失沿滤层的变化等方面，详细分析了长纤维高速过滤器基于结构上独特特点而形成的积泥逐层向滤床深处推移，直至整个滤床“衰竭”的典型深层过滤过程与特征，为过滤技术的深度开发提供了依据。

关键词：长纤维高速过滤器深层过滤过程机理

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Aerobic granulation of pure bacterial strain

ADAV Sunil S., LEE Duu-Jong

《环境科学与工程前沿（英文）》 2008年第2卷第4期页码 461-467 doi: 10.1007/s11783-008-0066-0

摘要： The objective of this study is to cultivate aerobic granules by pure bacterial strain, , in a sequencing batch reactor. Stable granules sized 2.0–2.2 mm were formed in the reactor after a five-week cultivation. These granules exhibited excellent settling attributes, and degraded phenol at rates of 1.49 and 1.19 g phenol/(g VSS·d) at 250 and 1500 mg/L of phenol concentration, respectively. Confocal laser scanning microscopic test results show that was distributed over the initial small aggregates, and the outer edge of the granule was away from the core regime in the following stage.

关键词： following excellent settling phenol/ sequencing microscopic

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various types of 3-hydroxy-3-methylglutaryl coenzyme A reductase inhibitors on changes in glomerular filtration

Seo Yeon Baik, Hyunah Kim, So Jung Yang, Tong Min Kim, Seung-Hwan Lee, Jae Hyoung Cho, Hyunyong Lee, Hyeon Woo Yim, Kun-Ho Yoon, Hun-Sung Kim

《医学前沿（英文）》 2019年第13卷第6期页码 713-722 doi: 10.1007/s11684-018-0661-9

摘要： Few long-term follow-up studies have compared the changes in renal function according to the type of statin used in Korea. We compared the long-term effects of statin intensity and type on the changes in the glomerular filtration rate (GFR). We extracted data of patients who took statin for the first time. We analyzed whether or not different statins affect the changes in GFR at 3 months after baseline and 4 years after. We included 3678 patients and analyzed the changes in GFR. The GFR decreased by 3.2%±0.4% on average 4 years after the first statin prescription, indicating statistically significant deterioration (from 83.5±0.4 mL/min/1.73 m to 79.9±0.4 mL/min/1.73 m , <0.001). When comparing the GFR among different statins, significant differences were observed between atorvastatin and fluvastatin (−5.3%±0.7% vs. 1.2%±2.2%, <0.05) and between atorvastatin and simvastatin (−5.3%±0.7% vs. −0.7%±0.8%, <0.05). In pitavastatin (odds ratio [OR]=0.64, 95% confidence interval [CI]=0.46–0.87, <0.005) and simvastatin (OR=0.69, 95% CI=0.53–0.91, <0.008), the GFR rate that decreased by<60 mL/min/1.73 m was significantly lower than that of atorvastatin. Regarding long-term statin intake, GFR changed with the type of statin. This work is the first in Korea to compare each statin in terms of changes in the GFR after the statin prescription.

关键词： statin glomerular filtration rate HMG-CoA reductase inhibitor chronic kidney disease

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Simultaneous sorption of aqueous phenanthrene and phosphate onto bentonites modified with AlCl3 and CTMAB

ZHU Runliang, ZHU Lizhong, ZHU Jianxi

《环境科学与工程前沿（英文）》 2007年第1卷第1期页码 79-82 doi: 10.1007/s11783-007-0015-3

摘要： The purpose of this work is to synthesize a new type of bentonite sorbent that can simultaneously remove both organic compounds and phosphate from water. Inorganic-organic bentonites (Al-CTMAB-Bent) were synthesized by modifying bentonites with both AlCl3 and cetyltrimethyl ammonium bromide (CTMAB). Simultaneous sorption of aqueous phenanthrene and phosphate onto Al-CTMAB-Bent was examined. Removal rates of phenanthrene and phosphate from water reached 96.3% and 90.2%, respectively, at their respective initial concentrations of 1 mg/L and 5 mg/L and the added amount of Al-CTMAB-Bent was 1.25 g/L. The residual turbidity of the Al-CTMAB-Bent suspension decreased 81.4% compared to that of organobentonite suspension after a 1 h settling time. Thus, inorganic-organic bentonite can be used to treat wastewater containing both organic pollutants and phosphate.

关键词： phenanthrene settling respective residual turbidity Inorganic-organic

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Application of ultra-sonication, acid precipitation and membrane filtration for co-recovery of protein

Liangliang WEI,Kun WANG,Xiangjuan KONG,Guangyi LIU,Shuang CUI,Qingliang ZHAO,Fuyi CUI

《环境科学与工程前沿（英文）》 2016年第10卷第2期页码 327-335 doi: 10.1007/s11783-014-0763-9

摘要： A novel method was applied to co-recover proteins and humic acid from the dewatered sewage sludge for liquid fertilizer and animal feed. The proteins in sewage sludge were first extracted using the processes of ultra-sonication and acid precipitation, and then the humic acid was recovered via membrane filtration. The extraction efficiency was 125.9 mg humic acid?g VSS volatile suspended solids (VSS) and 123.9 mg proteins?g VSS at the optimal ultrasonic density of 1.5 W?mL . FT-IR spectrum results indicated that the recovered proteins and humic acid showed similar chemical characteristic to the natural proteins and humic acid. The acidic solution (pH 2) could be recycled and used more than 10 times during the co-recovery processes. In addition, the dewatered sludge could be easily biodegraded when the humic acid and proteins are extracted, which was essential for further utilization. These findings are of great significance for recovering valuable nutrient from sewage sludge.

关键词： sewage sludge co-recovery proteins humic acid recycling biodegradation rate

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Precision control system of two-DOF stage with linear ultrasonic motor

ZHANG Hanlei, SHI Yunlai, ZHAO Chunsheng

《机械工程前沿（英文）》 2008年第3卷第4期页码 421-425 doi: 10.1007/s11465-008-0063-9

摘要： Using an appropriate control method, linear ultrasonic motors can be used in applications requiring high position accuracy. In this paper, a closed loop PI control system is designed to achieve high position accuracy during the control of a two-DOF stage driven by linear ultrasonic motors. Two ultrasonic motors are mounted on the stage to generate motion in two orthogonal directions. The PI control algorithm is used to increase the stability and accuracy of position control. The -axis mover covers 30 mm forward and backward in less than 0.3 s settling time and the -axis mover in less than 0.4 s. Experimental results denote that the control strategy proposed in this paper appears to have high efficiency, quick response, and high accuracy.

关键词： settling position accuracy PI control control algorithm orthogonal

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Modification of the activated sludge model for chemical dosage

Shuai MA,Siyu ZENG,Xin DONG,Jining CHEN,Gustaf OLSSON

《环境科学与工程前沿（英文）》 2015年第9卷第4期页码 694-701 doi: 10.1007/s11783-014-0732-3

摘要： Full-scale experiments have been carried out to adapt the activated sludge model ASM2d to include the influence of metal dosage (Fe and Al ) for phosphorus removal. Phosphorus removal rates, nitrification rates, as well as pH and sludge settling performance, were evaluated as functions of the metal dosages. Furthermore, models relating certain parameters to the dosage of chemicals have been derived. Corresponding parameters in the ASM2d and the secondary settler models, included in the Benchmark Simulation Model No 1 (BSM1), have been modified to take the metal influence into consideration. Based on the effluent limits and penalty policy of China, an equivalent evaluation method was derived for the total cost assessment. A large number of 300-day steady-state and 14-day open-loop dynamic simulations were performed to demonstrate the difference in behavior between the original and the modified BSM1. The results show that 1) both in low and high mole concentrations, Fe addition results in a higher phosphorus removal rate than Al ; 2) the sludge settling velocity will increase due to the metal addition; 3) the respiration rate of the activated sludge is decreased more by the dosage of Al than Fe ; 4) the inhibition of Al on the nitrification rate is stronger than that of Fe ; 5) the total operating cost will reach the minimum point for smaller dosages of Fe , but always increase with Al addition.

关键词： chemical precipitation benchmark simulation model phosphorus removal respiratory rate sludge settling activated sludge model

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标题作者时间类型操作

Occurance and control of manganese in a large scale water treatment plant

Youjun CHEN,Feng XIAO,Yongkang LIU,Dongsheng WANG,Ming YANG,Hua BAI,Jiong ZHANG

期刊论文

Mechanism on minimization of excess sludge in oxic-settling-anaerobic (OSA) process

WANG Jianfang, ZHAO Qingliang, JIN Wenbiao, LIN Jikan

期刊论文

Characterization of particle deposition during crossflow filtration as influenced by permeate flux andcrossflow velocity using a microfluidic filtration system

Hongzhan Di, Gregory J. O. Martin, Dave E. Dunstan

期刊论文

Removal of virus aerosols by the combination of filtration and UV-C irradiation

期刊论文

Enhanced cross-flow filtration with flat-sheet ceramic membranes by titanium-based coagulation for membrane

期刊论文

Membrane fouling control by ultrasound in an anaerobic membrane bioreactor

SUI Pengzhe, WEN Xianghua, HUANG Xia

期刊论文

and computational assessment of 1,4-Dioxane degradation in a photo-Fenton reactive ceramic membrane filtration

期刊论文

面向未来饮用水净化的OSRO技术——基于河岸过滤的一步反渗透技术