[Study on the effect of total phosphor removing by constructed submerged hydrophyte bed for urban landscape river].

A kind of modularized and air adjustable constructed submerged plant bed (CSPB) was used to restore the eutrophic water. This CSPB helps hydrophytes to grow up under poor conditions, like frequently changed water depth, blurred water transparency, algae bloom and duckweed rampant in summer, which are not suitable for growing water plants naturally. The experiments in Waihuan River of Tianjin show that total phosphor (TP) reduces 30%-40% in growing season and 7%-20% in winter when the detention time is 5.

[Effect of intermittent artificial aeration on nitrogen and phosphorus removal in subsurface vertical-flow constructed wetlands].

Shale and T. latifolia were used as subsurface vertical-flow constructed wetland substrate and vegetation for eutrophic Jin River water treatment, and investigate the effect of intermittent aeration on nitrogen and phosphorus removal. In this study, hydraulic loading rate was equal to 800 mm/d, and ratio of air and water was 5:1.

[Optimization of nitrogen and phosphorus removal in vertical subsurface flow constructed wetlands by using polypropylene pellet as part of substrate].

Constructed wetlands experiments were conducted by using shale and Typha latifolia L. as vertical subsurface flow constructed wetland substrate and plant for eutrophic Jin River water treatment, and part of shale with polypropylene pellet was replaced to investigate its effect on nitrogen and phosphorus removal. In this study, hydraulic loading rate was equal to 800 mm/d, theoretic residence time was equal to 12 h.

Experimental investigation of the effect of flow turbulence and sediment transport patterns on the adsorption of cadmium ions onto sediment particles.

The mechanism of flow turbulence, sediment supply conditions, and sediment transport patterns that affect the adsorption of cadmium ions onto sediment particles in natural waters are experimentally simulated and studied both in batch reactors and in a turbulence simulation tank. By changing the agitation conditions, the sediment transport in batch reactors can be categorized into bottom sediment-dominated sediment and suspended sediment-dominated sediment. It is found that the adsorption rate of bottom sediment is much less than that of suspended sediment, but the sediment transport pattern does not affect the final (equilibrium) concentration of dissolved cadmium.