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横沙浅滩 1

泥沙淤积 1

深水航道 1

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Preparation and sedimentation behavior of conductive polymeric nanoparticles

WANG Jixiao, LIU Rui, ZHANG Xiaoyan, ZHOU Zhibin, WANG Zhi, WANG Shichang

《化学科学与工程前沿（英文）》 2008年 第2卷 第3期   页码 231-235 doi: 10.1007/s11705-008-0055-7

摘要： A facile route to prepare FeO/polypyrrole (PPY) core-shell magnetic nanoparticles was developed. FeO nanoparticles were first prepared by a chemical co-precipitation method, and then FeO/PPY core-shell magnetic composite nanoparticles were prepared by in-situ polymerization of pyrrole in the presence of FeO nanoparticles. The obtained nanoparticles were characterized by scanning electronic microscopy (SEM), transmission electronic microscopy (TEM) and laser particle size analyzer. The images indicate that the size of FeO particles is about 10 nanometers, and the particles are completely covered by PPY. The FeO/PPY core-shell magnetic composite nanoparticles are about 100 nanometers and there are several FeO particles in one composite nanoparticle. The yield of the composite nanoparticles was about 50%. The sedimentation behavior of FeO/PPY core-shell magnetic nanoparticles in electrolyte and soluble polymer solutions was characterized. The experimental results indicate that the sedimentation of particles can be controlled by adjusting electrolyte concentration, solvable polymers and by applying a foreign field. This result is useful in preparing gradient materials and improving the stability of suspensions.
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Applying chemical sedimentation process in drinking water treatment plant to address the emergent arsenic

Pengfei LIN,Xiaojian ZHANG,Hongwei YANG,Yong LI,Chao CHEN

《环境科学与工程前沿（英文）》 2015年 第9卷 第1期   页码 50-57 doi: 10.1007/s11783-014-0733-2

摘要： Arsenic (As) spills occurred more frequently and sometimes polluted water sources in recent years in China. It is as urgent need to develop emergency treatment technologies to address the arsenic threat for large-scale water treatment plants. In response, we developed a chemical sedimentation technology to remove arsenic contaminants for water treatment plants. Bench-scale experiments were conducted to investigate the efficiency of arsenic removal and the influencing factors of the chemical sedimentation treatment process. The influencing factors included the choice and dosage of coagulants, the valence of arsenic and pH value of solution. The As(V) contaminants can be almost completely removed by ferric or alum coagulants. The As(III) contaminants are more recalcitrant to chemical sedimentation, 75% for ferric coagulant and 40% for alum coagulant. The quantitative results of arsenic removal load by different ferric or alum coagulants were presented to help determine the parameters for arsenic treatment technology. The dominant mechanism for arsenic removal is static combination, or adsorption of negative arsenic species onto positive ferric hydroxide or alum hydroxide flocs. The efficiency of this treatment technology has also been demonstrated by a real production test in one water treatment plant with arsenic-rich source water and one emergency response. This technology was verified to be quick to set-up, easy to operate and highly efficient even for high concentration of arsenic.

关键词： Arsenic spill     chemical sedimentation     coagulation     drinking water     emergency treatment    

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Prediction of hydro-suction dredging depth using data-driven methods

《结构与土木工程前沿（英文）》 2021年 第15卷 第3期   页码 652-664 doi: 10.1007/s11709-021-0719-7

摘要： In this study, data-driven methods (DDMs) including different kinds of group method of data handling (GMDH) hybrid models with particle swarm optimization (PSO) and Henry gas solubility optimization (HGSO) methods, and simple equations methods were applied to simulate the maximum hydro-suction dredging depth (hs). Sixty-seven experiments were conducted under different hydraulic conditions to measure the hs. Also, 33 data samples from three previous studies were used. The model input variables consisted of pipeline diameter (d), the distance between the pipe inlet and sediment level (Z), the velocity of flow passing through the pipeline (u0), the water head (H), and the medium size of particles (D50). Data-driven simulation results indicated that the HGSO algorithm accurately trains the GMDH methods better than the PSO algorithm, whereas the PSO algorithm trained simple simulation equations more precisely. Among all used DDMs, the integrative GMDH-HGSO algorithm provided the highest accuracy (RMSE = 7.086 mm). The results also showed that the integrative GMDHs enhance the accuracy of polynomial GMDHs by ~14.65% (based on the RMSE).

关键词： sedimentation     water resources     dam engineering     machine learning     heuristic    

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Classification of contaminants and treatability evaluation of domestic wastewater

WANG Xiaochang, JIN Pengkang, ZHAO Hongmei, MENG Lingba

《环境科学与工程前沿（英文）》 2007年 第1卷 第1期   页码 57-62 doi: 10.1007/s11783-007-0011-7

摘要： Long-term sampling and analysis were conducted in a domestic wastewater treatment plant for the investigation on the characteristics of the representative contaminants in raw sewage such as SS, COD, BOD5, TP, and TN. All these constituents were classified into dissolved and suspended groups by using a 0.45-µm membrane filter, and the concentration of each constituent in each group was analyzed. As a result, almost 100% of the SS was found to be suspended matter, as well as about 65% of COD, 60% of BOD, 50% of P, and 20% of N. All these could be easily removed by sedimentation or coagulation/sedimentation. A treatability evaluation diagram was proposed for a rational selection of wastewater treatment process in accordance with raw water quality.

关键词： Long-term sampling     selection     accordance     wastewater treatment     coagulation/sedimentation    

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Loss coefficient of nitrogenous non-point source pollution under various precipitation conditions

CHENG Hongguang, HAO Fanghua, REN Xiyan, YANG Shengtian, XIONG Wen, LEI Shaoping

《环境科学与工程前沿（英文）》 2008年 第2卷 第2期   页码 230-235 doi: 10.1007/s11783-008-0043-7

摘要： In this study, calibrations of non-point source (NPS) pollution models are performed based on Black River basin historical real-time runoff data, sedimentation record data, and NPS sources survey information. The concept of NPS loss

关键词： information     concept     non-point     historical real-time     sedimentation    

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Acidogenic sludge fermentation to recover soluble organics as the carbon source for denitrification in wastewater treatment: Comparison of sludge types

Lin Lin, Ying-yu Li, Xiao-yan Li

《环境科学与工程前沿（英文）》 2018年 第12卷 第4期 doi: 10.1007/s11783-018-1043-x

摘要：

CEPS sludge was compared with conventional primary and secondary sludge for the VFAs yield.

Fe-based CEPS sludge exhibited the highest efficiency of organic recovery.

Fermented CEPS sludge liquor provided a sufficient carbon source for denitrification.

99% of nitrate removal was achieved based on the Fe-CEPS and sludge fermentation.

关键词： Sewage sludge     Chemically enhanced primary sedimentation (CEPS)     Acidogenic fermentation     Organic carbon recovery     Nitrogen removal    

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Effects of alfalfa coverage on runoff, erosion and hydraulic characteristics of overland flow on loess slope plots

Shufang WU, Pute WU, Hao FENG, G. P. Merkley

《环境科学与工程前沿（英文）》 2011年 第5卷 第1期   页码 76-83 doi: 10.1007/s11783-011-0282-x

摘要： An evaluation of the interactions between vegetation, overland and soil erosion can provide valuable insight for the conservation of soil and water. An experiment was conducted to study water infiltration, runoff generation process, rate of sediment erosion, and hydrodynamic characteristics of overland flow from a sloping hillside with different draw-off discharges from alfalfa and control plots with 20° slope. The effect of alfalfa on runoff and sediment transport reduction was quantitatively analyzed. Alfalfa was discussed for its ability to reduce the overland flow scouring force or change the runoff movement. Compared to the bare-soil plots, alfalfa plots generated a 1.77 times increase in infiltration rate. Furthermore, the down-slope water infiltration rate for the bare soil plots was higher than in the up-slope, while the opposite was found in the alfalfa plots. In addition, alfalfa had a significant effect on runoff and sediment yield. In comparison to the control, the runoff coefficient and sediment transportation rate decreased by 28.3% and 78.4% in the grass slope, respectively. The runoff generated from the alfalfa and bare-soil plots had similar trends with an initial increase and subsequent leveling to a steady-state rate. The transport of sediment reduced with time as a consequence of the depletion of loose surface materials. The maximum sediment concentration was recorded within the first few minutes of each event. The alfalfa plots had subcritical flow while the bare-soil plots had supercritical flow, which indicate that the capability of the alfalfa slope for resisting soil erosion and sediment movement was greater than for bare soil plots. Moreover, the flow resistance coefficient and roughness coefficient for the alfalfa plots were both higher than for the bare-soil plots, which indicate that overland flow in alfalfa plots had retarded and was blocked, and the flow energy along the runoff path had gradually dissipated. Finally, the ability to erode and transport sediment had decreased.

关键词： alfalfa     soil erosion     runoff and sedimentation     soil water infiltration     overland flow     hydrodynamic characteristics    

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依托横沙浅滩开发大型深水港区的技术可能性

程泽坤,邵荣顺

《中国工程科学》 2013年 第15卷 第6期   页码 41-47

摘要：

从上海港可持续发展和长江三角洲、长江流域社会经济发展角度出发，提出并论证了依托横沙浅滩开发建设大型深水港区的技术可能性，通过潮流数值模拟分析了港区规划的初步形态，利用多种泥沙估算方法对港池和航道回淤强度进行了估算，研究认为，依托横沙浅滩开发建设大型深水港区技术上是可能、可行的。

关键词： 横沙浅滩     选址     港区规划     深水航道     港池     泥沙淤积    

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标题 作者 时间 类型 操作

Preparation and sedimentation behavior of conductive polymeric nanoparticles

WANG Jixiao, LIU Rui, ZHANG Xiaoyan, ZHOU Zhibin, WANG Zhi, WANG Shichang

期刊论文

Applying chemical sedimentation process in drinking water treatment plant to address the emergent arsenic

Pengfei LIN,Xiaojian ZHANG,Hongwei YANG,Yong LI,Chao CHEN

期刊论文

Prediction of hydro-suction dredging depth using data-driven methods

期刊论文

Classification of contaminants and treatability evaluation of domestic wastewater

WANG Xiaochang, JIN Pengkang, ZHAO Hongmei, MENG Lingba

期刊论文

Loss coefficient of nitrogenous non-point source pollution under various precipitation conditions

CHENG Hongguang, HAO Fanghua, REN Xiyan, YANG Shengtian, XIONG Wen, LEI Shaoping

期刊论文

Acidogenic sludge fermentation to recover soluble organics as the carbon source for denitrification in wastewater treatment: Comparison of sludge types

Lin Lin, Ying-yu Li, Xiao-yan Li

期刊论文

Effects of alfalfa coverage on runoff, erosion and hydraulic characteristics of overland flow on loess slope plots

Shufang WU, Pute WU, Hao FENG, G. P. Merkley

期刊论文

依托横沙浅滩开发大型深水港区的技术可能性

程泽坤,邵荣顺

期刊论文