The result of BOD_5 of the wastewater is high than the normal after aquatic pretreatment in pollution micro-source of,because there is lot of nitrifying bacteria in the biological pond and wastewater.

COD_B value was transformed with the biological oxygen demand(BOD_5) measured value from same samples and the mean values were analyzed by variance analysis.

BOD_5 can reflect more truly the pollution of the Yellow River, however,.

According to the relation of BOD 5 and TOC in refinery effluent,the dilution multiple of BOD 5 can be estimated and then used for measurement in the computation model.

Having made the research of BOD 5 measuring method by OxiTop measurement system.

pH, COD Cr , BOD 5 and PSB quantity during the treatment has been illustrated.

Detection of CODcr by Microwave Digestion Photometric Method and Its Unified Benefits Analysis;

The correlation of BOD5 and CODcr were analyzed in this paper according to the measured data of water quality of Cihu Lake in Hubei Province and the mathematical statistics, and meanwhile some questions in applying the correlation are also presented.

Properties of modified bentonite were characterized by various analysis techniques and modified bentonites were applied to pretreatment of high strength landfill leachate with CODCr up to 20,000~37,000mg/L.