To examine spatial variations of grain-size characteristics caused by both natural and human-induced processes along the Lianyungang muddy coast, China, 129 samples were collected and measured using standard sieving a...To examine spatial variations of grain-size characteristics caused by both natural and human-induced processes along the Lianyungang muddy coast, China, 129 samples were collected and measured using standard sieving and sedimentation techniques. Results show that sediment diameter tends to increase with increasing water depth from nearshore to offshore. Size-frequency distributions indicate a gradual mixing process of coarse and fine diameter material. Grain size trend analysis indicates that a man-made structure, the West has resulted in severe siltation in Haizhou Bay and Breakwater, along with Liandao Island itself, the Lianyungang port area, where sediment quality is also poor. Results demonstrate that grain size can be used as a natural tracer to infer how sediments respond to the effects caused by both natural and human-induced processes.展开更多
To remove effectively the pollutants from printing and dyeing wastewater, a new complex adsorption-coagulation agent was developed and employed in dyeing wastewater treatment. The experimental results showed that bett...To remove effectively the pollutants from printing and dyeing wastewater, a new complex adsorption-coagulation agent was developed and employed in dyeing wastewater treatment. The experimental results showed that better removals of COD, turbidity and color could be efficiently realized under the operating conditions of mixing at 150 r/min, reacting within 5 min and dosing at 15 g/L and 20 g/L, respectively. Combined with the settled sludge, the agent could be recycled for further adsorption and coagulation within 10 times. Compared to the conventional coagulants, the newly-developed agent had such merits as suitability for wide pH range of wastewater, less sludge production, reutilization of the condensed sludge and low operation cost.展开更多
基金Supported by the Natural Science Foundation of the Institutions of Higher Education of Jiangsu (No. 07KJD170012)
文摘To examine spatial variations of grain-size characteristics caused by both natural and human-induced processes along the Lianyungang muddy coast, China, 129 samples were collected and measured using standard sieving and sedimentation techniques. Results show that sediment diameter tends to increase with increasing water depth from nearshore to offshore. Size-frequency distributions indicate a gradual mixing process of coarse and fine diameter material. Grain size trend analysis indicates that a man-made structure, the West has resulted in severe siltation in Haizhou Bay and Breakwater, along with Liandao Island itself, the Lianyungang port area, where sediment quality is also poor. Results demonstrate that grain size can be used as a natural tracer to infer how sediments respond to the effects caused by both natural and human-induced processes.
文摘To remove effectively the pollutants from printing and dyeing wastewater, a new complex adsorption-coagulation agent was developed and employed in dyeing wastewater treatment. The experimental results showed that better removals of COD, turbidity and color could be efficiently realized under the operating conditions of mixing at 150 r/min, reacting within 5 min and dosing at 15 g/L and 20 g/L, respectively. Combined with the settled sludge, the agent could be recycled for further adsorption and coagulation within 10 times. Compared to the conventional coagulants, the newly-developed agent had such merits as suitability for wide pH range of wastewater, less sludge production, reutilization of the condensed sludge and low operation cost.
