The Research Effect Of Enhanced Coagulation On The Water Introduced From The Yellow River

In this study, experimental section of the water introduce from the yellow river including enhanced coagulation and coagulation coupled with follow-up handicraft were down in different season.it mainly contains optimization of coagulation process, coagulation-precipitation on processing high algae-laden water in summer,using sand filter next to micro-flocculation on processing the water of low temperature and low turbidity in winter, the water treatment by efficient precipitation desilter coupled with other water treatment technology, and a part of pre-oxidation technology on processing water of low temperature low turbidity. At last we can draw some conclusions from the experimental results:(1)In coagulation optimization experiment we can see that slow speed mixing in coagulation process playing a key role. Especially for raw water containing different pollutants, we can adopt the right rotate speed optimize the effects of the pollutants. At the same time because the difference between dynamic test and project is smaller relative to a beaker experiment and project smaller, the experimental results can be presented by G or GT which can be applied to the project water treatment.(2)Some organic-inorganic composite coagulants, were used to treat the high algae-laden water. The influence of dosage on turbidity, organic matter and algae removal were investigated. The results showed that, compared with inorganic coagulants, the orgainic-inorganic composite coagulants show a better turbidity, organic matter and algae removal effects. While Aluminum salt had a better effect in the removal rate of algae and turbidity, on treating the water dissolved organic is not as well as ferric salt. So we can use special coagulants for different water.(3) By micro-flocculation experiment results we can see that increasing the dosage of PFAC can increase the removal rate turbidity, particles and CODMn.At the same time we can see through experimental results that micro-flocculation can also resolve the problem that low temperature and low turbidity water is hard to treat. At last, by survey Zeta potential, we can explain the experimental phenomenon.(4) Through this part of the experiment we can learn that the water comprehensive quality of Yellow River in the summer are superior to that of winter. But in winter, the water system contains some more kind of carbon based and material, and its prove that, DAF treating for low temperature low can have good result.(5) By combination process and pre-oxidation testing we can see that the sedimentation basin technology combine with other technology have a good effect. And the process of pre-oxidation shows different increasing effect for different technology. At the same time pre-oxidation shows a good effect on processing high algae-laden water in summer.