PKA wetland sewage treatment technology has accumulated experience over 2,300 application cases in 13 years. The PKA wetland is mainly composed of medium, plants and microorganisms. It realizes the efficient purification of sewage by filtration, adsorption, precipitation, ion exchange, plant absorption and microbial decomposition.
PKA wetland overturns the traditional theory and believes that there are three ways for oxygen to enter the wetland:
(1) Plant absorption accounts for 12.5%;
(2) Oxygen diffusion in the atmosphere and wetland surface layer accounts for 42.5%;
(3) Convection between dielectric layer and dielectric is 45.0%.
PKA rural sewage treatment technology effluent can meet GB18918-2002 level A standard and can be in stable operation for 50 years without special maintenance.
（1）Mature technology: more than 2500 projects have been built in China;
（2）Long service life: the earliest project has been in stable operation for 13 years;
（3）Low operating cost: annual operating cost of each household is less than 10 Yuan (35 tons /100 households);
（4）Good landscape effect without odor and highly integrated with the surrounding environment;
（5）Low terrain requirements: it is not affected by the terrain and can adapt to local conditions.