This paper introduces some concrete measures, based on the concrete problems during the designing, when the net level length of the underground gas pipeline with different subjects is not long enough and the construction methods when the gas pipeline through the heavy caliber road culverts; meanwhile, some plans about the gas meter in middle or small public building users are put up.

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;

Operational parameters of Orbal oxidation ditch process in one sewage purification plant;

Study progress in constructed wetland ecosystems for sewage purification;

Recent advances of sonochemical oxidation in sewage purification;