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PubMed | Jinan Water and Wastewater Monitoring Center and Harbin Institute of Technology
Type: Journal Article | Journal: Environmental science and pollution research international | Year: 2016

A pilot-scale gravity-driven membrane (GDM) filtration system under low gravitational pressure without any pre-treatment, backwash, flushing, or chemical cleaning was carried out to investigate the effect of operation parameters (including operation pressure, aeration mode, and intermittent filtration) on the effluent quality and permeability development. The results revealed that GDM system exhibited an efficient performance for the removal of suspended substances and organic compounds. The stabilization of flux occurred and the average values of stable flux were 6.6, 8.1, and 8.6Lm(-2)h(-1) for pressures of 65, 120, and 200mbar, respectively. In contrast, flux stabilization was not observed under continuous and intermittent aeration conditions. However, aeration (especially continuous aeration) was effective to improve flux and alleviate membrane fouling during 1-month operation. Moreover, intermittent filtration would influence the stabilization of permeate flux, resulting in a higher stable flux (ranging from 6 to 13Lm(-2)h(-1)). The stable flux significantly improved with the increase of intermittent period. Additionally, GDM systems exhibited an efficient recovery of flux after simple physical cleaning and the analyses of resistance reversibility demonstrated that most of the total resistance was hydraulic reversible resistance (50-75%). Therefore, it is expected that the results of this study can develop strategies to increase membrane permeability and reduce energy consumption in GDM systems for decentralized water supply.


Wang X.G.,Shandong Normal University | Ren Z.M.,Shandong Normal University | Ma Z.Y.,Jinan Water and Wastewater Monitoring Center
Applied Mechanics and Materials | Year: 2014

A new bio-optoelectronic system, which included the behavior (aquatic organism) monitoring system and the water physiochemical factor monitoring system, was developed for the purpose of the management of accidental pollution events in water resource in Ji'nan, China. The system included a monitoring center and three monitoring stations. Communication between the monitoring stations and the monitoring center was mainly by the General Packet Radio Service network transmission complemented by a dial-up connection for use when this service was unavailable. The results suggested that once an accidental pollution occurred, the system would make a comprehensive evaluation based on the Self-Organising Map analysis on the monitoring data and some decision would be made based on the Emergency Management of Accidental Pollution. As a result, the new bio-optoelectronic system provided an effective approach on the management of accidental pollution events in drinking water supply. © (2014) Trans Tech Publications, Switzerland.


Wu J.S.,Shandong Jianzhu University | Jia R.B.,Jinan Water and Wastewater Monitoring Center | Li B.,Shandong Jianzhu University | Liu C.C.,Shandong Jianzhu University
Applied Mechanics and Materials | Year: 2014

In this paper, the Chlorella vulgaris in Yellow River Diversion reservoir was selected as experimental subjects to cultivate in laboratory. The the relationship between algae biomass and N,P was studied from the following aspects:the type of nitrogen source, the concentration of N and P, and the ratio of N and P. It was found that KNO3was one of the best nitrogen source for growth of Chlorella vulgaris. Chlorella vulgaris can live at the lower N concentration, while it was very difficult to survive in the absence of P. So P is the limiting factor for its growth. In addition, the optimum ratio of nitrogen to phosphorus was 16:1, for Chlorella vulgaris’s growth. It was similar to the algae outbreak in the water eutrophication, glycine as the Chlorella nutrition, the algae grew slow at early and later rapid. © (2014) Trans Tech Publications, Switzerland.


Song W.,Shandong University | Gao B.,Shandong University | Xu X.,Shandong University | Wang F.,Shandong University | And 4 more authors.
Journal of Hazardous Materials | Year: 2016

A novel adsorbent of magnetic amine-crosslinked biopolymer based corn stalk (MAB-CS) was synthesized and used for nitrate removal from aqueous solution. The characters and adsorption mechanisms of this bio-adsorbent were determined by using VSM, TGA, XRD, SEM, TEM, FT-IR and XPS, respectively. The results revealed that the saturated magnetization of MAB-CS reached 6.25emu/g. Meanwhile, the studies of various factors indicated that this novel magnetic bio-adsorbent performed well over a considerable wide pH range of 6.0~9.0, and the presence of PO4 3- and SO4 2- would markedly decrease the nitrate removal efficiency. Furthermore, the nitrate adsorption by MAB-CS perfectly fitted the Langmuir isotherm model (R2=0.997-0.999) and pseudo second order kinetic model (R2=0.953-0.995). The calculated nitrate adsorption capacity of MAB-CS was 102.04mg/g at 318K by Langmuir model, and thermodynamic study showed that nitrate adsorption is an spontaneous endothermic process. The regeneration experiments indicated its merit of regeneration and stability with the recovery efficient of 118~147%. By integrating the experimental results, it was found that the removal of nitrate was mainly via electrostatic attraction and ion exchange. And this novel bio-adsorbent prepared in this work could achieve effective removal of nitrate and rapid separation from effluents simultaneously. © 2015 Elsevier B.V.


Zhao S.,Shandong University | Gao B.,Shandong University | Yue Q.,Shandong University | Sun S.,Shandong University | And 2 more authors.
Journal of Hazardous Materials | Year: 2015

Enteromorpha polysaccharides (Ep) were used as a new coagulant aid together with polyaluminum chloride (PACl) in coagulation-ultrafiltration process to purify Yellow River water. The evolution of flocs size, growth rate, strength, recoverability and fractal structure due to Ep addition were systematically studied in this paper. On this basis, membrane fouling caused by the coagulation effluents of PACl and Ep were also investigated. Results indicated that Ep addition lead to 20% increase in coagulation performance, and meanwhile generate flocs with bigger sizes, faster growth rates and higher recovery abilities. Additionally, the flocs formed by PACl presented more compact structure with a larger Df value, while much looser flocs were obtained when Ep was added. Results of ultrafiltration experiments implied that with Ep addition, membrane fouling could be significantly reduced due to large size and loosely structures of flocs in coagulation effluents. Considering both the coagulation efficiency and ultrafiltration membrane performance, 0.2mg/L Ep was determined as the optimal dosage in coagulation-ultrafiltration process in this study. © 2014 Elsevier B.V.


Chen L.,Shandong University | Jia R.-B.,Jinan Water and Wastewater Monitoring Center | Li L.,Shandong University
Environmental Sciences: Processes and Impacts | Year: 2013

Bacteria in drinking water distribution systems can cause deterioration of the water quality, and the microbial quality of tap water is closely related to consumer health. In the present study, the potential effects of bacteria attached to cast iron pipes on tap water in a distribution system were investigated. Comparison of the bacterial community composition of pipe tubercles with that of stagnant tap water samples based on a denaturing gradient gel electrophoresis analysis of the 16S rRNA gene revealed that the communities were related. Specifically, the main bacterial members were identical to each other. The bacterial community was found to be dominated by Firmicutes, Actinobacteria, and Proteobacteria, which included Rhizobium, Pseudomonas, Lactococcus, Brevundimonas, Rheinheimera, Arthrobacter, Bacillus, and Herbaspirillum. Heterotrophic bacteria proliferation was observed during the period of stagnation, followed by a decrease of assimilable organic carbon and a slight increase of microbially available phosphorus. These findings indicated that the regrowth of bacteria might be boosted by the release of nutrients such as phosphorus from the pipe walls, as well as the decline of residual chlorine during stagnation. Inorganic contaminants at low levels, including Al, Mn, Zn, Pb, Cr, Cu, and Ni, were detected in tubercles and were concentrated in particulates from tap water following the release of iron during stagnation. © 2013 The Royal Society of Chemistry.


Zhao S.,Shandong University | Gao B.,Shandong University | Yue Q.,Shandong University | Song W.,Jinan Water and Wastewater Monitoring Center | And 2 more authors.
Desalination | Year: 2015

The effects of a new coagulant aid - enteromorpha polysaccharides (Ep) on floc characteristics and the subsequent membrane fouling were investigated in this paper. Ep was used with polyaluminum chloride (PACl) to improve HA removal efficiency, and the variations of floc characteristics ascribed to the addition of Ep were studied systematically. Moreover, membrane fouling caused by coagulation effluent was also investigated using a dead-end batch ultrafiltration unit. Experiment results showed that the addition of adequate Ep could improve HA removal efficiency, and the optimal Ep dosage was 0.3. mg/L. Floc sizes, growth rates and their recovery abilities could be improved apparently due to Ep addition, while the fragile and much loosely constructed flocs were obtained. In addition, the results of ultrafiltration experiments indicated that when Ep was used, membrane fouling could be significantly reduced due to the loosely structured flocs. © 2015 Elsevier B.V.


Sun W.,Shandong University | Jia R.,Jinan Water and Wastewater Monitoring Center | Gao B.,Shandong University
Frontiers of Environmental Science and Engineering in China | Year: 2012

In this paper, a method using solid-phase extraction (SPE) and gas chromatography-mass spectrometry (GC-MS) was developed to simultaneously analyze five taste and odor compounds in surface water, i. e., 2-methylisoborneol (2-MIB), 2,4,6-trichloroanisole (TCA), 2-isopropyl-3-methoxy pyrazine (IPMP), 2-isobutyl-3-methoxy pyrazine (IBMP), and trans-1,10-dimethyl-trans-9-decalol (geosmin, GSM). The mass spectrometry was operated in selective ion monitoring (SIM) mode. Three kinds of SPE columns and three eluting solvents were compared, the C18 column was chosen as optimum SPE column, and methanol was chosen as the optimum eluting solvent. It was found that the method showed good linearity in the range of 1-200 ng·L -1 and gave detection limits of 0.5-1.5 ng·L -1 for individual compounds. Good recoveries (93.5%-108%) and relative standard deviations (1.58%-7.31%) were also obtained. Additionally, concentrations of these taste and odor compounds in Jinan's surface and drinking water were analyzed by applying this method, and the results showed that GSM and 2-MIB were the dominant taste and odor compounds in Jinan's raw water. © 2010 Higher Education Press and Springer-Verlag Berlin Heidelberg.


PubMed | Jinan Water and Wastewater Monitoring Center and Shandong University
Type: | Journal: Journal of hazardous materials | Year: 2015

A novel adsorbent of magnetic amine-crosslinked biopolymer based corn stalk (MAB-CS) was synthesized and used for nitrate removal from aqueous solution. The characters and adsorption mechanisms of this bio-adsorbent were determined by using VSM, TGA, XRD, SEM, TEM, FT-IR and XPS, respectively. The results revealed that the saturated magnetization of MAB-CS reached 6.25 emu/g. Meanwhile, the studies of various factors indicated that this novel magnetic bio-adsorbent performed well over a considerable wide pH range of 6.0 9.0, and the presence of PO4(3-) and SO4(2-) would markedly decrease the nitrate removal efficiency. Furthermore, the nitrate adsorption by MAB-CS perfectly fitted the Langmuir isotherm model (R(2)=0.997-0.999) and pseudo second order kinetic model (R(2)=0.953-0.995). The calculated nitrate adsorption capacity of MAB-CS was 102.04 mg/g at 318 K by Langmuir model, and thermodynamic study showed that nitrate adsorption is an spontaneous endothermic process. The regeneration experiments indicated its merit of regeneration and stability with the recovery efficient of 118 147%. By integrating the experimental results, it was found that the removal of nitrate was mainly via electrostatic attraction and ion exchange. And this novel bio-adsorbent prepared in this work could achieve effective removal of nitrate and rapid separation from effluents simultaneously.


PubMed | Jinan Water and Wastewater Monitoring Center and Shandong University
Type: | Journal: Bioresource technology | Year: 2016

In this work, a new kind of magnetic amine/Fe3O4 functionalized biopolymer resin (amine/Fe3O4-resin) was prepared and applied to remove various anionic dyes from water. Methyl Orange (MO), Reactive Brilliant Red K-2BP (RBR) and Acid Red 18 (AR) were selected as the typical anionic dye for this research. Meanwhile, amine/Fe3O4-resin was characterized by VSM, XRD, FT-IR, SEM, TEM and XPS. Three anionic dyes removed by amine/Fe3O4-resin were investigated using batch adsorption technique, and the parameters including adsorbent dosage, pH, contact time and temperature were considered. Due to a large number of amine groups and high surface areas, amine/Fe3O4-resin exhibited a remarkably high adsorption capacity for all three dyes, reaching 101.0mg/g, 222.2mg/g and 99.4mg/g for RBR, MO and AR at 25C, respectively. The pseudo second order model and Langmuir model agreed well with the experimental data, and regeneration experiments indicated its merit of separability and reusability.

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