At the present time,there are many reporting about application of constructed wetland,but the removal efficiency of waste water in constructed wetland is effected by many factors,it can not clean waste water according to people,s demand,in other words,the effectiveness is not perfect.

The hydraulic characteristics of vertical flow constructed wetlands was investigated, and the influence of these characteristics on wastewater purifying efficiency was studied as an emphasis.

Evaluation of different pore membrane water purification;

Wet vegetation performed different physiological actions under different pollution loads,thus inducing different purification effects on pollutants.

The purification effect of underflow type constructed wetland in the winter;

Influence of plant photosynthetic characteristics on DO distribution, purification effect in constructed wetlands;

Influences of anodic materials on electric energy consumption and purification effect of wastewater electrochemical treatment;

The results indicated that the removal efficiency was good.

The purpose of this study is to establish an evaluation method for PM_(10) removal efficiency of air-cleaning devices in the central air conditioning ventilation systems.

Allocation,circulation and purifying effect of nickel in synthetic wastewater in Avicennia marina simulated wetland system;

Abstract To survey the purifying effect of the tunnel air purification device on typical volatilie organic substances.

However, the pollutant removal efficiency of constructed wetland is greatly affected by such factors as dissolved oxygen, air temperature, wetland plants, microorganisms in soil, however these factors limit the further improving of purifying effect in wetland, now becoming the blocking bottleneck in extending application of wetland.