China Water Resources Pearl River Planning Surveying and Designing Co.

Guangzhou, China

China Water Resources Pearl River Planning Surveying and Designing Co.

Guangzhou, China

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Li H.,Sun Yat Sen University | Lei H.,Sun Yat Sen University | Yu Q.,Sun Yat Sen University | Li Z.,China Water Resources Pearl River Planning Surveying and Designing Co. | And 2 more authors.
Chemical Engineering Journal | Year: 2010

This work evaluates the effect of low frequency ultrasonic irradiation on the sonoelectro-Fenton (SEF) oxidation process in an acid aqueous medium. Ultrasonic irradiation significantly increases the H2O2 production rate and reduces the time needed to reach the maximum H2O2 concentration. In addition, ultrasonic irradiation has a considerable effect on the degradation of the cationic red X-GRL in the SEF process. A pseudo-first-order model was used to simulate the experimental results, and this revealed that the decolorization rate increased with the ultrasonic power in the SEF process. Furthermore, both TOC removal efficiency and mineralization current efficiency were greatly promoted in the SEF process compared with the electro-Fenton (EF) process. These results prove that the SEF process is a promising technology in terms of colored wastewater treatment. © 2010 Elsevier B.V.


Yu Q.,Sun Yat Sen University | Lei H.,Sun Yat Sen University | Li Z.,China Water Resources Pearl River Planning Surveying and Designing Co. | Li H.,Sun Yat Sen University | And 3 more authors.
Water Research | Year: 2010

In this study, we investigate the physical and chemical properties of waste-activated sludge after treatment with microwave irradiation. The results indicate that microwave energy and contact time strongly influence the physical and chemical properties of sludge. According to the settling velocity and particle size measurements, the microwave energy of 900 W with a contact time of 60 s may be the optimal condition for improving the ability of the sludge to settle. Results of the experiments have shown that supernatant turbidity, soluble chemical oxygen demand, volatile suspended solid solubilization, extracellular polymeric substances content, and inorganic nitrogen increase significantly with contact time. Based on these results, we find that the microwave irradiation treatment specified by the contact time not only improves settleability, but also disintegrates sludge and destroys microbial cells. Possible mechanisms of microwave treatment are also discussed. Crown Copyright © 2010.


Ji B.,China Water Resources Pearl River Planning Surveying and Designing Co. | Ji B.,Hohai University | Zhang X.Y.,South China Institute of Environmental Sciences | Li Z.,China Water Resources Pearl River Planning Surveying and Designing Co. | And 3 more authors.
Water Science and Technology | Year: 2010

Studies of the flocculation properties of bioflocculant combined with its structure characterization are helpful to develop more effective bioflocculant. This paper reports findings of our research on the flocculation properties of the bioflocculant ZS-7 in the kaolin suspension based on its structure characterization. With the addition of 2 mg/L ZS-7 and 9mM CaCl2, the optimum temperature for flocculation performance of ZS-7 in the kaolin suspension is about 30°C, giving the highest flocculating activity 99.2%. Studies of the flocculation properties revealed that it was stable at 60-100°C and pH 4-10. Moreover, it could flocculate a kaolin suspension over a wide range of pH (2-12) and temperatures (4-958C) in the presence of CaCl2. © IWA Publishing 2010.


Chen X.,CAS Qingdao Institute of Bioenergy and Bioprocess Technology | Huang C.,China Water Resources Pearl River Planning Surveying and Designing Co. | Liu T.,CAS Qingdao Institute of Bioenergy and Bioprocess Technology
Desalination and Water Treatment | Year: 2012

In this paper, polyvinylidene fluoride (PVDF) microfiltration membrane was used for harvesting microalgae Scenedesmus sp. The changes of permeation flux and OD750 of the algae medium during membrane filtration process were investigated. In order to reduce membrane fouling, both ventilation into algae medium and backwashing were adopted. The results showed that backwashing was better than ventilation to control membrane fouling. The optimized procedure was backwashing for 1 min every 20 min of continuing filtration. When the volume reduction factor (VRF) was up to 10, the recovery rate of the algae cells could reach above 90%. In addition, this paper showed that VRF and the initial concentrations of algae broth significantly affected the recovery rate. Higher VRF and higher initial concentrations of algae could make the recovery rate lower. Therefore, in order to obtain the needed recovery rate, these above factors needed to be considered. Generally, these results provided the feasible way to harvest microaglae efficiently and safely. © 2012 Desalination Publications. All rights reserved.


Liu F.-Y.,Xi'an University of Technology | Zhang Z.,Xi'an University of Technology | Zhou D.,YELLOW AND CO | Zhao X.-G.,China Water Resources Pearl River Planning Surveying and Designing Co. | Zhu L.,Xi'an University of Technology
Yantu Lixue/Rock and Soil Mechanics | Year: 2011

Soil water characteristic curve (SWCC) plays a significant role in unsaturated soil mechanics. There are several factors influencing the soil water characteristic curve, such as initial density, dry-wetting cycle and stress, etc. A series of tests are carried out by means of GCTS-type SWCC device for soil water characteristic curve for remoulded unsaturated loess specimens at different bulk densities. Based on test results, after a well-adapted selection of soil water characteristic curve model, the influence of initial bulk density on unsaturated loess soil water characteristic curves are studied through analyzing the best-fitting curve parameters. The two drying-wetting cycles tests for a specimen at certain initial density are also carried out; and the corresponding hysteretic curves are obtained. By developing the concept named "degree of hysteresis" and analyzing the differences of volumetric water content in the drying-wetting cycle test, the SWCC hysteresis behaviour of unsaturated loess is preliminarily studied. The aforesaid results may play a significant role in the investigations on stress-dependent soil water characteristic curve model and the force-water coupled constitutive model.


Zhang Z.,Xi'an University of Technology | Liu F.-Y.,Xi'an University of Technology | Zhao X.-G.,China Water Resources Pearl River Planning Surveying and Designing Co. | Zhou D.,YELLOW AND CO
Shuili Xuebao/Journal of Hydraulic Engineering | Year: 2013

Soil water characteristic curve plays a significant role in unsaturated soil mechanics, geotechnical and geoenvironmental engineering. A series of soil water characteristic tests for remoulded loess specimens under no stress state and certain consolidation stress states. For Xi'an loess and Saskatchewan silt, Indian Head till in the past literatures, the result shows that the evolutions of water-solid volumetric ratio with matric suction can be normalized by a single curve in the certain consolidation or preconsolidation void ratio ranges. A new model considering void ratio variation with stress is proposed based on van Genuchten model. In addition, the model can not only be in good accordance with the test data, but also provide a new insight into the hydro-mechanical constitutive relationship for unsaturated soils.


Jing Y.,China Water Resources Pearl River Planning Surveying and Designing Co. | Hu L.,China Water Resources Pearl River Planning Surveying and Designing Co. | Yue J.,China Huadian Corporation
Advanced Materials Research | Year: 2012

Core of the topological optimization site selection of offshore wind farm is Delphi method. The paper divides the investigated experts into industry experts and professional experts, which respectively score the weighting coefficient and its value of the influence factors of offshore wind farm. The separate marking scheme can well develop the ability of experts, avoid the specialty bias and thereby improve the assessment accuracy. Another modification is to apply the accumulative vote method in the first stage of topological optimization site selection instead of designers' own judgments, which gives a good solution to classify the disputed factors, and avoids fault or deviation due to the knowledge deficiency of designers. In addition, the data analysis results should be reassessed by the industry experts. And in company with the reassessment opinion the data analysis results are the basis for designers to determine the best sea area for offshore wind farm construction, which gives an extra guarantee for the scientific site selection. © (2012) Trans Tech Publications, Switzerland.


Li L.,Jinan University | Yang Y.,Jinan University | Tam N.F.Y.,City University of Hong Kong | Yang L.,National Sun Yat - sen University | And 2 more authors.
Ecological Engineering | Year: 2013

Plants are an indispensable component of a constructed wetland; however, the eco-physiological characteristics of wetland plants and their influences on wastewater treatment efficiency are still unclear. In this study, we investigated the growth features of six commonly used wetland plants, namely, Canna indica (Ci), Iris pseudacorus (Ip), Pontederia cordata (Pc), Cyperus alternifolius (Ca), Vetiveria zizanioides (Vz), and Pennisetum purpureum (Pp) that were treated with sewage. After 50 days of treatment, plants treated with diluted sewage, especially Ci and Ip, had a better growth rate than those receiving undiluted sewage. The abilities of different wetland plants to directly take up nitrogen (9.28-17.26mgg-1 DW) and phosphorus (0.89-2.18mgg-1 DW) were species-specific, but within each species, uptake was similar between diluted and undiluted sewage. Total biomass determined the total accumulation of N and P in plant tissues. The removal of pollutants, except nitrate and organic matter, was dependent on both plant species and sewage dilution. The first-order rate constants (K) for nitrate and organic matter were similar between diluted and undiluted sewage. Differences in the removal of nitrate and biochemical oxygen demand among plant species were due to differences in chlorophyll fluorescence, a photosynthetic characteristic, leading to different root lengths. The amounts of oxygen release to the rhizosphere (radial oxygen loss [ROL]) by wetland plant was directly governed by total root biomass and significantly influenced the removal of ammonia and total dissolved phosphorus via processes such as plant uptake and nitrification. The removal of total phosphorus and chemical oxygen demand resulted from the filtration by root systems. A non-species-specific significant positive correlation was found between ROL (12.50-205.25μmolO2d-1g-1 DWroot) and root porosity (9.95-32.49%). These results suggest that the root features and photosynthetic characteristic of wetland plants are important determinants of sewage treatment efficiency and could be used to select appropriate plants for constructed wetland systems. © 2013 Elsevier B.V.


Li W.,China Water Resources Pearl River Planning Surveying and Designing Co. | Li G.,China Water Resources Pearl River Planning Surveying and Designing Co. | Tian S.,China Water Resources Pearl River Planning Surveying and Designing Co.
Procedia Engineering | Year: 2014

There are big differences between drilling technology in water conservancy project and other engineering, especially, in borehole wall stability and stopping leaking technology, water conservancy engineering drilling process has its particularity. In this paper, classification method of complex stratum, its leaking stoppage and slurry requirements was presented, taking the borehole ZK21 of Zhuchanghe Reservoir as analysis example, complex formation borehole ZK21 is mainly weak interlayer which unsteady borehole wall and dropout phenomenon exist during drilling construction, aiming at the complex formation, the technical measures of borehole wall protection and leaking stoppage were proposed. © 2014 Published by Elsevier Ltd.


Jing Y.,China Water Resources Pearl River Planning Surveying and Designing Co. | Wu B.,South China University of Technology
Advanced Materials Research | Year: 2011

The paper extracts two types of investigated models from frames in fire according to their horizontal deformation characteristics, and provides a simplified method to calculate horizontal deformation of frames, which can be applied to single- and multi-layers frames. Compared with the results by finite element analysis, it shows that the simplified method is a feasible method for the horizontal displacement estimation of frames in fire, and the treatment of the column restraint rigidity for multi-layers frame is appropriate. © (2011) Trans Tech Publications.

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