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Zhang Y.,Shandong Key Laboratory of Water Pollution Control and Resource Reuse | Zhang Y.,Shandong University | Gao B.,Shandong Key Laboratory of Water Pollution Control and Resource Reuse | Gao B.,Shandong University | And 7 more authors.
Journal of Petroleum Science and Engineering | Year: 2010

In order to treat produced water from polymer flooding (PWPF), a new treatment method of combining hydrolysis acidification-dynamic membrane bioreactor (DMBR)-coagulation process was developed. The experimental results demonstrated that the highest acidification efficiency in hydrolysis acidification reactor (HAR) was 10.98% under hydraulic retention time (HRT) of 12h. During the stable stage of dynamic membrane, the average concentration of ammonia nitrogen (NH3-N) and chemical oxygen demand (COD) in effluent from DMBR was 1.50 and 476.63mg/L, respectively, while the concentration of oil was too low to be detected. In coagulation process, when the effluent from DMBR at pH 9.0 was treated directly, the COD removal efficiency could reach 89.41% with Aluminum sulfate (Al2(SO4)3) under the dosage of 140mg/L. However, the dosage of Al2(SO4)3 would decrease to 80mg/L with the same COD removal efficiency (88.37%) under the optimal pH 5.0. The combined process operated continuously for 30days and the final effluent could meet the class I National Wastewater Discharge Standard of China. (GB 8978-1996). © 2010 Elsevier B.V.


Li S.,Shandong University | Li S.,Shandong Key Laboratory of Water Pollution Control and Resource Reuse | Xu Y.,Shandong University | Wang X.,Shandong University | And 2 more authors.
RSC Advances | Year: 2016

Lanthanum (La) doped titanium dioxide (TiO2) introduced to the dielectric barrier discharge (DBD) system was successfully used to degrade 4-chlorophenol (4-CP). The photocatalytic materials were characterized by XRD, SEM, EDX and DRS techniques. The influence of the La doping ratio and pH on the degradation of 4-CP in the combined system of photocatalysis and plasma were investigated to evaluate the feasibility of the mixed degradation system. The 10 wt% La/TiO2 showed the highest percentage of 4-CP degradation (99.0%) and maximum rate constant (11.89 × 10-3 s-1). It was also found that the catalytic activity of 10La/TiO2 was higher than pure synthesized TiO2. Doped La effectively reduces the band gap, amends the surface and optimizes the crystal form of TiO2. Higher degradation efficiency of 4-CP was observed at higher pH values. The efficiency was 99.9% at pH 10.0 in this treatment system, while a decrease was observed at pH 2.0. Catechol, hydroquinone, benzoquinone and carboxylic acid were identified as the predominant aromatic intermediates for the degradation of 4-CP, and finally, transformed into CO2 and H2O. © The Royal Society of Chemistry 2016.


Sun X.-F.,Shandong Key Laboratory of Water Pollution Control and Resource Reuse | Guo B.-B.,Shandong Key Laboratory of Water Pollution Control and Resource Reuse | He L.,Shandong Key Laboratory of Water Pollution Control and Resource Reuse | Xia P.-F.,Shandong Key Laboratory of Water Pollution Control and Resource Reuse | Wang S.-G.,Shandong Key Laboratory of Water Pollution Control and Resource Reuse
AIChE Journal | Year: 2016

Fast and effective methods for the removal of pollutants are crucial for the development of new sustainable water treatment technologies. In this work, we have reported the electrically accelerated removal of some typical organic pollutants by a three-dimensional graphene aerogel (3DG). The porous 3DG was fabricated by chemical reduction of graphene oxide. The morphology and structure of 3DG were characterized by microscopic and spectroscopic approaches. The experiments indicated that 3DG-based electrosorption could accelerate the removal of positively and negatively charged pollutants, such as Acid Red 88, Orange II, and Methylene Blue, as well as enhance the maximum adsorption capacity toward these contaminants. The interaction mechanisms between these organic pollutants and 3DG surface were further elucidated by Dispersion corrected Density Functional Theory (DFT-D) calculations. This 3DG-based system offers a potentially effective method for the rapid removal of organic pollutants and provides a new sustainable approach for water and wastewater treatment. © 2016 American Institute of Chemical Engineers.


Li S.,Shandong University | Li S.,Shandong Key Laboratory of Water Pollution Control and Resource Reuse | Liu L.,Shandong University | Ma X.,Shandong University | Li Y.,Shandong University
Journal of Advanced Oxidation Technologies | Year: 2016

In this paper, different dielectric barrier discharge powers and the effects of various external factors on the degradation of thiamethoxam were investigated. TiO2 catalyst was added to improve the degradation efficiency, and the effects of different forms of catalysts (powdered TiO2 and TiO2 loaded on ceramic) were compared. The results showed that the removal rate of thiamethoxam could reach 85.9% after 160-min degradation with a discharge power of 150 W. The degradation process was inhibited with the increase of initial electrical conductivity and initial pH, or the addition of n-butyl alcohol, whereas Fe2+ and Cu2+ could promote the degradation. The catalytic efficiency of TiO2 loaded on ceramic was slightly higher than that of powdered TiO2. According to the analysis results of the degradation products by high performance liquid chromatography-mass spectrometry low temperature dielectric barrier discharge plasma could effectively degrade the thiamethoxam in water. In conclusion, the dielectric barrier discharge plasma can facilitate the degradation of thiamethoxam in water, which lays a solid foundation for wastewater treatment in the field of pesticide. © 2016 Science & Technology Network, Inc.


Li S.,Shandong Key Laboratory of Water Pollution Control and Resource Reuse | Li S.,Shandong University | Ma X.,Shandong University | Liu L.,Shandong University | Cao X.,Shandong University
RSC Advances | Year: 2015

Degradation of 2,4-dichlorophenol (2,4-DCP) in wastewater was conducted in a dielectric barrier discharge (DBD) reactor coupled with TiO2 photocatalysis. The main advantage of the system is that ultraviolet (UV) light produced by the DBD and reactive species like ozone (O3) can be used for the treatment of wastewater. In this study, the effect of discharge voltage, initial concentration and initial pH on the degradation of 2,4-DCP was studied. TiO2 and I-TiO2 were introduced to enhance the removal efficiency of 2,4-DCP. We also investigated the effect of adding tert-butanol to probe the role of hydroxyl radicals in the reaction. The results indicated that 2,4-DCP could be removed effectively and hydroxyl radicals played an important role during the degradation process by the low temperature plasma. The removal efficiency of 2,4-DCP with I-TiO2 was better than with TiO2. The degradation efficiency with 10% I-TiO2 was 89.59% after 120 min when the discharge voltage was 75 V, pH 5.32 and 50 mg L-1 was selected as the initial concentration. The removal efficiency of 2,4-DCP decreased with the increasing concentration of tert-butanol because alcohols are excellent radical scavengers that inhibit the generation of hydroxyl radicals during the DBD process. The degradation products of 2,4-DCP were characterized qualitatively and quantitatively using Mass spectrometry and UV-Vis spectroscopy. Besides, the degradation mechanism, the degradation pathway and the structures of intermediate products were also examined and discussed in detail. This journal is © The Royal Society of Chemistry 2015.


Li S.,Shandong University | Li S.,Shandong Key Laboratory of Water Pollution Control and Resource Reuse | Li Y.,Shandong University | Zeng X.,Shandong University | And 3 more authors.
RSC Advances | Year: 2015

Acetamiprid, a type of new neonicotinoid pesticide, shows a high threat to water systems. Electro-catalytic degradation of acetamiprid was evaluated using an Er doped Ti/SnO2-Sb electrode prepared by the Pechini method. The acetamiprid degradation obeys first order reaction kinetics and is controlled by mass transport and oxygen evolution. TOC removal efficiency and UV scan curves revealed that some intermediate products were produced by the Er doped Ti/SnO2-Sb electrode. Through electrospray ionization quadrupole time-of-flight tandem mass spectrometry, the ion mass-to-charge ratio of intermediate products was determined. Combining the experimental results, a degradation pathway was proposed for the electro-catalytic degradation of acetamiprid. Electrodes were mainly characterized by linear sweep voltammetry and cyclic voltammetry. The acetamiprid and TOC concentrations were reduced to 87.45% and 69.31%, respectively, after 180 min of electrolysis at 10 mA cm-2. © The Royal Society of Chemistry 2015.


Li S.,Shandong University | Li S.,Shandong Key Laboratory of Water Pollution Control and Resource Reuse | Ma X.,Shandong University | Jiang Y.,Shandong University | Cao X.,Shandong University
Ecotoxicology and Environmental Safety | Year: 2014

Degradation of acetamiprid in wastewater was studied in a dielectric barrier discharge (DBD) reactor. This reactor produces ultraviolet light and reactive species like ozone (O3) can be used for the treatment of wastewater. We examined the factors that could affect the degradation process, including the discharge power, and the initial concentrations of acetamiprid, and O3 which is generated by the DBD reactor. We also investigated the effect of adding Na2B4O7 as a radical scavenger to probe the role of hydroxyl radical in the reaction. The results indicated that acetamiprid could be removed from aqueous solution effectively and hydroxyl radicals played an important role during the degradation by the low temperature plasma. The degradation process of acetamiprid fits the first-order kinetics. The degradation efficiency was 83.48 percent at 200min when the discharge power was 170W and the initial acetamiprid concentration was 50mg/L. The removal efficiency of acetamiprid decreased with the increasing concentration of Na2B4O7 because B4O72- is an excellent radical scavenger that inhibited the generation of OH during the DBD process. The removal efficiency of acetamiprid improved in the presence of O3. The main reason was that O3 can oxidize certain organic compounds directly or indirectly by generating hydroxyl radicals. The degradation products of acetamiprid were characterized qualitatively and quantitatively using high performance liquid chromatography, mass spectrometry and UV-vis spectroscopy. © 2014 Elsevier Inc.

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