Abstract:

The purification effects of the sphagnum wetland on the contaminated water were studied.Two kinds of compounds (which are phosphate and bluestone) were used as pollutants in this study and the simulation boxes were introduced into the study.10 L polluted water was added into every box,using four grads of concentration of each element-0,100,1000,1000 mg/L.The experimental results indicated that:the purification rate of the three kinds of water polluted by the phosphate(concentrations are 10,100,100 mg/L,respectively) were 939%，695%，663% after two hours' purification of the sphagnum wetland,while purification rate polluted by the bluestone under the same condition were 1000%，976%，880%.So a conclusion is made that the purification ability of the sphagnum wetland is very high,and the turf plays an important part in purification of the sphagnum wetland.The dynamic processes of the purification of the sphagnum wetland were tested using six kinetic models.The processes could be described well by pseudosecondorder kinetic model,Elovich model,twoconstant rate model,hyperbolic diffusion model.However,considering the prediction,pseudosecondorder kinetic model is the best.

Key words: Shennongjia DaJiuhu, sphagnum wetland, purification ratio, kinetics, purification mechanism