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".

Studies on Purity Wastwater in A Lagoon by Aquatic Plant;

Based on the biology, offers to use the biological methods such as biological nitrification-antidigesting reaction, planting the water plant in natural water bodies, sewage irrigation, lagoon and so on, to get rid of N, P in water bodies, thus to avoid the appearance of eutrophication of water bodies.

This paper introduces the engineering,conditions and technical treatment courses of dealing with papermaking wastewater in lagoon.