Influence of Pretreatment Methods for High Algal Water on the Determination of COD and BOD5
In water with high algal concentrations,the presence of a large amount of algae leads to elevated lev-els of COD and BOD5.In this study,eight pretreatment methods were used to treat high algal water and to de-termine the results of COD and BOD5.The results indicate that filtration using cotton qualitative fiber filter pa-per,acetic acid fiber filter membrane filtration and copper sulfate flocculation precipitation methods had great influence on the accuracy of the measurement results,which are not recommended for use.Furthermore,the re-moval rates of algae cells in water through 0.45 μm glass fiber filter membrane,quartz fiber filter membrane filtration,and centrifugation at 4000 r·min-1 for 10 minutes,were found to be obviously higher than those a-chieved by 63 μm nylon screen gauze and 25 μm nylon screen gauze filtration.This approaches are more effec-tive in mitigating the influence of algae on the results of COD and BOD5.Thus,different pretreatment methods have great variations on the measurements of COD and BOD5 in high algal water.
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