A mobile water purification platform for in-situ treatment of lake and reservoir eutrophication water is proposed in this paper. This platform is composed of water purification unit (mainly including adsorption unit, fine bubble aerator and micro-current electrolysis unit) and instruction control unit, water quality on-line detection unit and propulsion unit. Excessive nutrient is reduced and harmful algal blooms are controlled by removing nitrogen and phosphorus through adsorption unit and fine bubble aerator and inhibiting algal through micro-current electrolysis unit. The optimal dosage of adsorption material, in-situ adsorption time, aeration intensity, current density, electrolytic time and other technical parameters are obtained by experiments of adsorption, micro-porous aeration and micro current electrolysis using high-performance adsorbents, optimal aeration approach and electrode material. Finally, ways to improve the water purification performance and enhance the operation management of this platform are discussed according to the experimental results and subsequent practical applications. Overall, this platform is a new and effective technology of eutrophication treatment, and will provide solutions for the prevention and control of nutrient reduction and algae blooms.
To improve the quality of Journal of Yangtze River Scientific Research Institute on its 30th anniversary, we made a review on its development and historical changes in terms of Journal definition, column design, publication period, cover and format design, digitization, modernization of editing process, online publication, electronic publishing, as well as readers and authors. We also introduced our achievements such as being included in databases in China and abroad, selected as Chinese Core Journal and other awards. Furthermore, we summarized our experiences in paper planning, peer review, modernization and digitization, developing editorial committee and managing editorial office, abiding by national standards and specifications. Problems and shortcomings were proposed and corresponding countermeasures were discussed. Finally we made a prospect on its future development.
The emerging temperature tracer method has its own unique advantages in accurate calculation of the amount of hydrodynamic exchange in the hyporheic zone, which is always a challenge. On the basis of introducing temperature tracing theory and calculation methods, we calculate the amount of hydrodynamic exchange in the hyporheic zone of the Dakepo Lake as a case study. Results show that during the monitoring period, the magnitude of flow velocity that groundwater recharges lake is between 0~2cm/d, and the amount of total exchange is 2.35cm. In addition, by comparing with the results of hydrodynamic method, we can see that the results of the two methods are close, which indicates that the temperature tracer method has good accuracy for the calculation of pore water flow velocity, and is suitable for the accurate calculation of hydrodynamic exchange capacity in the hyporheic zone.
The response regularity and reinforcement mechanism of soft soil foundation reinforced by static and dynamic drainage consolidation method are usually obtained by analyzing the pore pressure, soil pressure, settlement, and strength variations under compaction. However there is no precise formula for the effective reinforce depth. In this research, we obtained a precise formula for the effective reinforce depth of soft soil foundation based on the principles of momentum conservation and energy conservation. The contact between hammer and soil is simplified as uniform deceleration linear motion. By comparing the calculated result with the field in-situ monitoring data of an engineering site in Guangzhou, we verified the feasibility of this formula. This research could be a reference for determining the effective reinforce depth of such soft soil foundation.
To obtain the disintegration features of remolded loess and their relation with different factors, we conducted tests on 32 loess samples of different initial water contents and dry densities by self-developed disintegration tester. The relationship curves of disintegration rate respectively vs. dry density, initial water content and effective void ratio are obtained. On the basis of soil-water characteristic curve(SWCC), the effect of pore structure on disintegration property is analyzed. Results show that under the same initial water content, the disintegration rate attenuates exponentially with the increase of dry density, and the attenuation rate linearly increases with the increase of initial water content; while under the same dry density, the disintegration rate shows a tendency of decreasing with the increase of initial water content, but it is not significant. Furthermore, the relationship between disintegration rate and effective void ratio is researched on the basis of the SWCC and the above obtained relationships. Different pore structures are formed in the process of sample preparation, and the distribution of disintegration rate is apparently divided into zones with the effective void ratio of 8% and 22% as dividing lines.
