2Aulenbach D.B., Nie M. S. Studies on themechanism of phosphorus removal from treated wastewater by sand. J. WPCF,1988,60(12) :2089-2094.
3Sakadevan K. ,Bavor H.J. Phosphate adsorption character- istics of soils with slags and zeolite to be used as substrates in constructed wetland systems. Water Resource, 1998,32 (2) :393-399.
4Kong H. N. , Yu Z. R. Study of the characteristics of CH4 and N20 emission and methods of controlling their emis- sion in the soil-trench wastewater treatment process. Science of the Total Environment, 2002,290 ( 1- 3) :59-67.