Showing papers by "Fenglin Yang published in 2012"
TL;DR: To improve the oleophilic/hydrophobic properties of polyurethane (PU) foams for oil spill cleanup, PU samples were modified by grafting with oleophile monomer Lauryl methacrylate in solvent and/or coating with LMA microspheres through heating and curing.
130 citations
TL;DR: A nano-catalyst Fe on TiO 2 was prepared and tested for efficient total organic carbon (TOC) removal during the photocatalytic oxidation of chlorophenols.
127 citations
TL;DR: In this article, a low voltage and low intensity electric field was applied to a membrane bioreactor attached with electric field to reduce fouling, energy consumption, and enhance treatment efficiency.
120 citations
TL;DR: A laboratory-scale anaerobic-anoxic-oxic membrane reactor (A(2)O-MBR) system was developed to investigate the treatment ability of coal gasification wastewater and it was found thatAnaerobic process played an important role in degradation of refractory compounds.
117 citations
TL;DR: In this article, stable partial nitrification was successfully achieved by 10mg/l hydroxylamine dosing in aerobic granules under experimental conditions of pH 7.8-8.2, dissolved oxygen (DO) above 5 ǫ, and temperature around 25 ÁC.
116 citations
TL;DR: In this paper, conductive membranes were fabricated by depositing polypyrrole from the vapor phase, which were employed as cathodes to induce an electric field in a laboratory-scale MBR.
104 citations
TL;DR: In this paper, carbon-supported nano-FeOOH catalysts were prepared by the air oxidation of ferrous hydroxide suspension method, and the as-prepared catalyst was characterized with various characterization techniques and identified as goethite and lepidocrocite mixed crystals.
Abstract: Iron oxyhydroxide (FeOOH) as heterogeneous catalyst has been widely used in Fenton-like advanced oxidation processes due to its attractive properties such as wide-operating pH range and controllable iron leaching into solution. However, little is known about the Fe3+/Fe2+ transformation of supported FeOOH catalyst under the external electrical field condition, which is of the essence in electro-Fenton-like oxidation reactions. In this study, activated carbon-supported nano-FeOOH (FeOOH/AC) catalysts were prepared by the air oxidation of ferrous hydroxide suspension method. The as-prepared catalyst was characterized with various characterization techniques and identified as goethite and lepidocrocite mixed crystals. Adsorption and electrochemically assisted oxidation of amaranth with the FeOOH/AC heterogeneous catalysts were investigated at pH 4.0 using graphite felt as cathode. Under weak acidic and external electric field conditions, the supported nano-FeOOH catalyst undergoes proton-promoted dissolution...
99 citations
TL;DR: In this paper, the authors reviewed recent advances in Membrane bioreactors (MBRs) by focusing on development of bioreactor configurations, enhanced degradation of pollutants, and sludge reduction.
Abstract: Membrane bioreactors (MBRs) are composed of activated sludge processes and membrane filtration. Because of their unique advantages such as good effluent quality and compact structure, MBRs have been widely used for municipal and industrial wastewater treatment. Recent advances in MBR research are reviewed by focusing on development of bioreactor configurations, enhanced degradation of pollutants, and sludge reduction. Efforts of a number of novel MBR processes such as hybrid biofilm MBR, submerged rotating MBR, MBR with reverse osmosis, osmotic MBR, membrane distillation bioreactor, air-sparging MBR, and jet loop MBR for the treatment of nitrogen, phosphorous, emerging contaminants, heavy metals, and sludge reduction are summarized. Process principles, benefits, and limitations of these MBRs are discussed. According to a detailed analysis of research publications, MBR research has undergone an extensive growth in the areas of development of novel MBR configurations and application of MBRs with ne...
85 citations
TL;DR: Forescence in situ hybridization together with DNA analysis indicated that anammox bacteria were highly enriched with the presence of the Fe electrode, and a more compacted microbial community structure was formed in R1.
79 citations
TL;DR: Potential in lowering the membrane cost, the operation and maintenance cost, and in enhancing MBR waste water treatment efficiency is expected by the use of this new composite membrane.
76 citations
TL;DR: Anammox start-up performances from the conventional activated sludge were compared between a MBR and SBR, and it was revealed that the MBR had the better biodiversity of Anammox bacteria and gained a higher ecological stability.
TL;DR: In this article, the effect and mechanism of electric currents on the anode corrosion and release of ferrous iron, sludge activity and fouling reduction were investigated in EC-eMBR.
TL;DR: Results demonstrate simultaneous-glucose is a strategy for efficient system performance and the microbiological evidence can contribute to improving understanding of and optimizing PCP degradation in MFCs.
TL;DR: In this article, two models were developed to predict the flux decline rate involving activated sludge properties through the employment of partial least squares (PLS), which owned good goodness-of-fit, robustness and predictive power.
TL;DR: Investigation of the microbial community development and its influence on biomass characteristics and membrane fouling during start-up of a hybrid anoxic-oxic MBR found small particle size, high fractal dimension (DF) and high EPS production were found to be the major contributors to the severe fouling.
TL;DR: In this article, a rotating tubular membrane bioreactor (RTMBR) was employed to achieve shearenhanced membrane filtration and fouling characteristics of the Bioreactor were investigated.
Abstract: Shear-enhanced membrane filtration is an effective way to mitigate membrane fouling in membrane bioreactor (MBR) technology. In this study, a novel rotating tubular membrane bioreactor (RTMBR) was employed to achieve shear-enhanced membrane filtration and fouling characteristics of the bioreactor were investigated. Through particle image velocimetry (PIV) analysis, it was found that the turbulence in the reactor intensified as the rotary speed increased. Two partial least squares (PLS) models predicting membrane fouling rate in the bioreactor were established employing rotary speed (RS), aeration rate (AR), mixed liquor suspended solids (MLSS), bound extracellular polymeric substances (bEPS) and mean particle size (MPS) as predictor variables. The models owned good robustness and predictive power. The results indicated that membrane fouling rate decreased as RS increased. The factors in order of decreasing influences on membrane fouling rate were MLSS, bEPS, RS, MPS and AR according to the model results, indicating a more significant impact of RS on membrane fouling rate than that of MPS and AR. Furthermore, 5 additional tests clearly verified the relationship between rotary speed and membrane fouling. Lastly, analysis of energy consumption suggested that increasing rotary speed to mitigate membrane fouling was much more energy saving and efficient than increasing aeration rate.
TL;DR: In this article, the electrocatalytic activity of the as-prepared anthraquinone/graphene nanocomposite towards O2 reduction was studied in neutral medium.
TL;DR: The experimental results indicated that the R2 based on nitrate had a good nitrogen removal performance at room temperature (25 °C) and the analysis results of fluorescence in situ hybridization (FISH) showed that the percentage compositions of anammox in R1 and R2 were 84% and 65% on day 189.
TL;DR: It was discovered that over 40% of COD and TOC removal can be easily realized in an hour of WAO oxidation, and depends on the optimal FPW:BPW volume ratio 4:1, to compose POM co-catalyst system.
TL;DR: In this article, a new helical membrane was rotated and its features in filtrating different particle suspensions such as yeast, kaolin and CaCO 3 in a cylindrical container were studied.
TL;DR: In this paper, modified polyester cathode membranes were prepared by coating graphene (Gr)/polypyrrole (PPy) or graphene oxide (GO)/PPy, which had higher conductivity and better antifouling property in EMBR than the membrane modified with PPy only.
TL;DR: A comprehensive risk assessment method based on catastrophe theory was proposed and used to analyze the risk levels of ten major chemical enterprises in the Songmu Island CIP, China, and revealed five enterprises with an unsafe risk level, and another five enterprises at the generally recognized as safe risk level.
Abstract: According to risk systems theory and the characteristics of the chemical industry, an index system was established for risk assessment of enterprises in chemical industrial parks (CIPs) based on the inherent risk of the source, effectiveness of the prevention and control mechanism, and vulnerability of the receptor. A comprehensive risk assessment method based on catastrophe theory was then proposed and used to analyze the risk levels of ten major chemical enterprises in the Songmu Island CIP, China. According to the principle of equal distribution function, the chemical enterprise risk level was divided into the following five levels: 1.0 (very safe), 0.8 (safe), 0.6 (generally recognized as safe, GRAS), 0.4 (unsafe), 0.2 (very unsafe). The results revealed five enterprises (50%) with an unsafe risk level, and another five enterprises (50%) at the generally recognized as safe risk level. This method solves the multi-objective evaluation and decision-making problem. Additionally, this method involves simple calculations and provides an effective technique for risk assessment and hierarchical risk management of enterprises in CIPs.
TL;DR: This paper attempts to provide a new methodology based on the extension theory to identify a range of alternatives and screen the best one and present a scientific methodology for the SEA alternative study.
Abstract: The main purpose of a strategic environmental assessment (SEA) is to facilitate the early consideration of potential environmental impacts in decision-making processes. SEA alternative identification is a core issue within the SEA framework. However, the current methods of SEA alternative formulation and selection are constrained by the limited setting range and lack of scientific evaluation. Thus, the current paper attempts to provide a new methodology based on the extension theory to identify a range of alternatives and screen the best one. Extension planning is applied to formulate a set of alternatives that satisfy the reasonable interests of the stakeholders. Extension priority evaluation is used to assess and optimize the alternatives and present a scientific methodology for the SEA alternative study. Thereafter, the urban traffic plan of Dalian City is used as an example to demonstrate the feasibility of the new method. The traffic planning scheme and the environmental protection scheme are organically combined based on the extension theory, and the reliability and practicality of this approach are examined.
TL;DR: In this paper, the bromamine acid (BA) removal was investigated in the electro-Fenton and Fenton systems, where BA degradation was divided into two phases: the BA quickly transforms into a hydroquinone structure (BAH) in the first few minutes probably due to the formation of a ternary HQ-Fe-H2O2 complex, and then the BAH is oxidized by the •OH;
Abstract: The bromamine acid (BA) removal is investigated in the electro-Fenton and Fenton systems. The BA is an important dye intermediate with difficult biodegradation. So removing BA with advanced oxidation processes may provide common information on anthraquinone dye wastewater treatment. BA has a typical quinonoid structure. It means that the degradation of BA may be coupled with a series of quinone–hydroquinone conversion reactions in these two systems. As a result, two distinct degradation processes for BA are shown in the electro-Fenton and Fenton systems. For a Fenton system, the BA degradation is divided into two phases: the BA quickly transforms into a hydroquinone structure (BAH) in the first few minutes probably due to the formation of a ternary HQ–Fe–H2O2 complex, and then the BAH is oxidized by the •OH; While, in the electro-Fenton system, the BAH is not accumulated during its degradation. Fenton reaction is the main reaction in the electro-Fenton system.
TL;DR: The experimental have shown that the average rate of elimination of the COD is of 91.3% and the removal ratio of the Color reach 87.5% in the membrane bioreactor treating reed pulping medium wastewater.
Abstract: In this study, the reed pulping medium wastewater was treated by the membrane bioreactor. The purpose of the study is to determine the operating conditions to the operation of internal membrane bioreactor for the treatment of reed pulping medium wastewater. The volume of the bioreactor is 15 litre in which develops an adapted biomass. The reed pulping medium wastewater was pumped from an influent trough into the bioreactor and a level sensor and a submerged pump were installed to adjust the water volume in the bioreactor. In the bioreactor the effluent separated from the activated sludge by the hollow fiber membrane module. The experimental have shown that the average rate of elimination of the COD is of 91.3%.The removal ratio of the Color reach 87.5%. The rate of elimination of the TSS is 90.2%.
Journal Article•
TL;DR: A one-dimension aerobic granule mathematical model was established, basing on mathematical biofilm model and activated sludge model, to simulate simple aerobic granules process such as nutrients removal, granule diameter evolution, cycle performance as well as depth profiles of DO and biomass.
Abstract: A one-dimension aerobic granule mathematical model was established, basing on mathematical biofilm model and activated sludge model. The model was used to simulate simple aerobic granule process such as nutrients removal, granule diameter evolution, cycle performance as well as depth profiles of DO and biomass. The effluent NH4(+) -N concentration decreased as the modeling processed. The simulation effluent NO3(-)-N concentration decreased to 3 mg x L(-1) as the granules grew. While the granule diameter increased from 1.1 mm on day 30 to 2.5 mm on day 100, the TN removal efficiency increased from less than 10% to 91%. The denitrification capacity was believed to enhance because the anoxic zone would be enlarged with the increasing granule diameter. The simultaneous nitrification and denitrification occurred inside the big aerobic granules. The oxygen permeating depth increased with the consumption of substrate. It was about 100-200 microm at the beginning of the aeration phase, and it turned to near 800 microm at the end of reaction. The autotrophs (AOB and NOB) were mostly located at the out layer where the DO concentration was high. The heterotrophic bacteria were distributed through the whole granule. As hydrodynamic shear coefficient k(de) increased from 0.25 (m x d)(-1) to 5 (m x d)(-1), the granule diameter under steady state decreased form 3.5 mm to 1.8 mm. The granule size under the dynamic steady-state decreased with the increasing hydrodynamic shear force. The granule size could be controlled by adjusting aeration intensity.