Effects Of MnO₂ Formed In Situ On The Dosage Of Coagulant In The Process Of Assistant Coagulation

Modern water filled with large amounts of organic pollutants. So how to remova trace organic pollutants in water has become a hot topic. Potassium permanganate as a pre-oxidant, it has many features, example high efficiency, low cost, no secondary pollution, etc. so it has been used in practical water treatment. on the one hand Potassium permanganate oxidation efficiency from its own, on the other hand Nascent Manganese dioxide also has strong decontamination capabilities.different morphology of the MnO₂ formed in situ in addition to its ability different.Water contaminants can restore potassium permanganate, May be macromolecular organic pollutants, such as humic acid, fulvic acid, also may be small organic molecules, and other substances, such as phenol, it may also be a reduction of metal ions such as Mn2+, Fe2+ and other substances. Different structural properties of the MnO₂ formed in situ produced by potassium permanganate reducing agent, So presumably it has different flocculation. In this paper, respectively, Mn2+, Fe2+,phenol as a reducing agent, reduction of potassium permanganate, to prepare the MnO₂ formed in situ, as Mn-MnO₂, Fe-MnO₂ and phenol-MnO₂, Three new ecological study of manganese dioxide to aluminum chloride Coagulation organics removal and effective range of aluminum chloride coagulation effects of humic acids.For Mn-MnO₂, Three concentrations MnO₂ effective destabilization of aluminum chloride coagulation intervals were widened, the maximum turbidity are about 70%, 80% and 90%. The impact of destabilization is great when added Mg2+,Ca2+, HPO42- and CO32- on the low concentration Mn-MnO₂, on the nascent high concentrations of manganese dioxide system, the ion can promote the addition of particles of destabilization.For Fe-MnO₂, aluminum chloride dosage of destabilization less affected, the entire aluminum chloride dosage range, turbidity changed a little, For the 10 mg/L MnO₂, turbidity has been maintained at 80% for high concentrations, turbidity remained at 95%. It greatly affect Fe-MnO₂ of destabilization. For high concentrations of MnO₂, the ion can promote the destabilization in the entire aluminum chloride dosage range, turbidity can reach more than 95%. For phenol-MnO₂ system, destabilization effect of low manganese concentration 10mg/L MnO₂ is not ideal, turbidity to 25%. As for the high concentration of MnO₂,turbidity throughout the aluminum chloride dosage range can reach 80%⁹0%.Added four kinds of ions Mg2+, Ca2+, HPO42- and CO32- both the low concentrationof Mn-MnO₂ can promote destabilization.In the presence of HA, not joined HA is similar to three concentrations Mn-MnO₂ destabilization of aluminum chloride coagulation effective range. Ca2+has less effective coagulation zone. Mg2+ in low concentration of MnO₂ has little effect, but a greater impact on the nascent high concentrations of MnO₂, HPO42- and CO32- make the effective range of the coagulation of aluminum disappear, But for low concentrations of MnO₂ affect turbidity smaller, for 100 mg/L. MnO₂ of high-impact, turbidity only up 30%. For phenol-MnO₂ system, low concentrations of 10mg/L MnO₂ destabilization is not ideal. For the 50 mg/L MnO₂, removal of the entire aluminum chloride dosage range, the turbidity of 75%. For the 100 mg/L MnO₂ in the 20 mg/L¹40 mg/L aluminum chloride concentration range, turbidity reached about 90%. four kinds of ions can be added for effective coagulation zone a nd has little effectof turbidity.