Entity

Time filter

Source Type


Ren S.,Wuhan University | Zhang X.,Wuhan University | Lu J.,South China Institute of Environmental Sciences | Lu J.,State Environmental Protection Key Laboratory of Water Environmental Simulation and Pollution Control
Harbin Gongcheng Daxue Xuebao/Journal of Harbin Engineering University | Year: 2015

This study investigates the interflow in stable temperature-stratified environments through flume experiments and examines the effects of inflow conditions and stratification strength on the separation depth in order to understand the interflow phenomenon in stratified reservoirs. The experimental result shows that the motion of interflow is influenced by the inflow conditions and stratification conditions. The former and the latter are represented by initial inflow buoyancy flux and buoyancy frequency, respectively. The separation depth and the thickness of the intrusion layer increase as inflow buoyancy flux increases and decrease as buoyancy frequency increases. The results of this research provide assistance in better understanding the movement of pollutant and provide more evidence for the management of the water quality in stratified reservoirs and aquatic environment. ©, 2015, Editorial Board of Journal of HEU. All right reserved. Source


Zhang X.-F.,Wuhan University | Ren S.,Wuhan University | Lu J.-Q.,South China Institute of Environmental Sciences | Lu J.-Q.,State Environmental Protection Key Laboratory of Water Environmental Simulation and Pollution Control | Lu X.-H.,Wuhan University
Journal of Zhejiang University: Science A | Year: 2015

This study is focused on the impact of thermal stratification on interflow travel time. A quantitative relation between buoyancy frequency and interflow travel time is theoretically derived based on the Bernoulli principle of energy conservation. Experiments and numerical simulations are carried out to validate the applicability of the proposed relation. For experiments, interflow movement is successfully detected in a small-depth water tank by releasing a denser flow into a temperature stratification environment. For numerical simulations, a vertical 2D renormalization group (RNG) k-ɛ model is developed to simulate the interflow. The results both of the experiments and of the numerical simulations verify our proposed theory. The derived analytic relation is useful for the prediction of contaminant travel time in reservoirs and in assisting pollution control. © 2015, Zhejiang University and Springer-Verlag Berlin Heidelberg. Source


Ren S.,Wuhan University | Zhang X.-F.,Wuhan University | Lu J.-Q.,South China Institute of Environmental Sciences | Lu J.-Q.,State Environmental Protection Key Laboratory of Water Environmental Simulation and Pollution Control
Shuidonglixue Yanjiu yu Jinzhan/Chinese Journal of Hydrodynamics Ser. A | Year: 2013

A flume experiment for the motion of reservoir density current in steady temperature stratified environment was used. Through different tests, simulated the density flow movement under the conditions of different temperature stratification, and analyzed the effects of stratified strength and outlet condition on density flow movement. The density flow movement characteristics under different reservoir operation modes were researched on the basis of model simulation. The research results can provide reference for the management about the water quality of the reservoir and aquatic environment, also can give reference for the early warning plan of reservoir emergency. Source


Wu H.,South China Institute of Environmental Sciences | Wu H.,Chinese Research Academy of Environmental Sciences | Li K.,South China Institute of Environmental Sciences | Li K.,State Environmental Protection Key Laboratory of Water Environmental Simulation and Pollution Control | And 4 more authors.
Chinese Journal of Environmental Engineering | Year: 2014

Influence of hydraulic retention time(HRT)on the formation of soluble microbial products (SMP), which was the main pollutants of the membrane fouling in membrane bioreactor (MBR), was investigated. The results showed that SMP was accumulated in MBR with running time extended. When the HRT was 12 h, the accumulation of SMP in MBR was 10.1% less, the polysaccharide was 7 mg/L higher, and the protein was 45.6% lower than that when the HRT was 8 h. SMP average particle size declined with time increasing. Shorter HRT benefited smaller particle size SMP generation, thus plugging membrane pore. Longer HRT did favor to larger particle size SMP generation, forming gel layer, and the membrane fouling mechanism was different caused by the two cases. Source


Jiang D.,South China Institute of Environmental Sciences | Jiang D.,The Key Laboratory of Water and Air Pollution Control of Guangdong Province | Jiang D.,State Environmental Protection Key Laboratory of Water Environmental Simulation and Pollution Control | Liu Y.,South China Institute of Environmental Sciences | And 7 more authors.
Huanjing Kexue Xuebao/Acta Scientiae Circumstantiae | Year: 2013

A novel electromagnetic aerobic membrane bioreactor (EMAMBR) was developed to remove trace naphthalene(Nap) and phenanthrene(Phe) in effluent from a printing and dyeing wastewater treatment plant. The performance of the EMAMBR was evaluated by monitoring the degradation efficiency of Nap and Phe compared to conventional aerobic MBR and electro-aerobic MBR. The effects of some parameters such as current strength, hydraulic retention time (HRT) and initial pH on the performance of the EMAMBR were investigated and degradation pathways of the Nap and Phe were proposed based on GC/MS data. The results showed that the EMAMBR could achieve enhanced degradation of Nap and Phe compared with conventional aerobic MBR and electro-aerobic MBR. The average degradation efficiency of Nap and Phe in the EMAMBR were 30%~60% higher than that obtained from the conventional aerobic MBR and electro-aerobic MBR and was improved with the increase of current strength and HRT. Up to 75% Nap(2.77~4.75 μg·L-1 )and Phe (2.0~8.0 μg·L-1)were degraded at current strength 20 mA, HRT 4 h and pH 6.5~7.5 and the total concentration of Polycyclic Aromatic Hydrocarbons (PAH) in effluent can meet the national drinking water standards(GB 5749-2006). The Nap was degraded via the salicylic acid pathway while Phe was degraded via both salicylic acid and o-phthalic acid pathways. Source

Discover hidden collaborations