Since the wastewater purification process in constructed wetland was a complex and nonlinear state affected by many interactional factors,it was hard to establish exact mathematics model to carry out multi-factor analysis and determine best operation condition by traditional means.

In the wastewater purification system of varied organisms, wastewater is purified according to the metabolism of the food chain step by step.

Research progress in photoreactors for water purification;

Preparation of powder activated carbon by rice husks and application in water purification;

A numerical simulation of water purification in closed harbor;