The stabilization pond has been used to treat municipal wastewater in Jiaozhou, The experimental results show that the techniques of the stabilization pond system consisting of sedimentation tank with inclined planes-anaerobic pond-facultative pond-aerobic pond is feasible for the municipal wastewater treatment with easy and reliable operation and lower cost.

In this paper,considering the situations of the oxidation ponds in Shizuishan City,the decontamination ability of oxidation ponds in different cases(the area is considered mainly) is calculated and predicted by using the Wehner-Wilhelm method.

The applicability of reactor model with axial diffusion (model Ⅰ) and model of continuous flow stirred tank reactors in series (mode Ⅱ) to the produced water oxidation ponds at Zhuangxi oil gathering/water treating plant in Zhuangxi, Shengli, is investigated by using the results of previous dynamical study and study on hydraulic residence time distribution.

Two mathematical models of oxidation ponds,that is, the correction equation of the completely mixed flow model and a model similar to the Michaelis-Menton enzymatic rate expression, have been studied.

Water body eutrophia and its prevention in oxidation pond;

CNPC Dagang Oilfield disposed oil extraction wastewater with oxidation pond technique.

Biomonitoring and evaluation were performed for abandoned oxidation ponds in the Ya-Er Lake, based on the National Standard of PRC "Water Quality-Microbial Community Biomonitoring PFU Method".