Potassium Ferrate And Ferric Sulfate Combined With Enhanced Phosphorus Removal Study

Shortage of water resources has become an important issue facing the world, especially China, water shortages and a large population, at the same time, water is also subject to different degrees of pollution, therefore, we should reasonable use of water resources and search for efficient water pollution treatment. The method is of particular importance. Deepening due to the eutrophication of water bodies, how to ensure the urban sewage treatment plant nitrogen and phosphorus removal becomes an important issue, polymeric ferric sulfate as an inorganic flocculants, has been a lot of put into production use, but a single use aggregate ferric sulfate and phosphorus removal, the use of pharmaceutical than large and do not have the desired effect, using potassium ferrate and polymeric ferric sulfate combined with the removal of phosphorus in sewage. Ferrate as a new water treatment agent, it is a set of oxidation, adsorption, flocculation, coagulation, disinfection, bleaching, deodorization of integrated water treatment agent, and no secondary pollution and other toxic side effects. This is the strong use of potassium ferrate oxidation function, joint polymeric ferric sulfate to remove phosphorus from sewage, thus making the phosphorus content of the water to reach a national urban sewage discharge of pollutants A standard.In this paper, the static test, simulation of urban sewage discharge to meet the national standards (P<≤1.5mg/L), and a B standard (P≤1mg/L), and on this basis, by the dosing of chemicals, so that emissions of phosphorus in the water and ultimately achieve the A standard at the national level (P<0.5mg/L). To this end, the experimental total divided into two parts:(1) In the phosphorus content of the raw water of1.5mg/L, orthogonal experiments, to determine the dosage of potassium ferrate and PFS oxide, pH, oxidation, flocculation pH, the optimum conditions for flocculation time, analysis The phosphorus removal rate trends, as well as to investigate the degradation mechanism.(2) Phosphorus content in the raw water of1mg/L, orthogonal experiments, to determine the potassium ferrate and PFS dosage oxide, pH, oxidation time, the pH of flocculation, the flocculation time of process conditions and analysis in addition to phosphorus rate trends as well as to investigate the degradation mechanism.In this study, the conclusions are as follows:(1) Phosphorus content in the raw water of1.5mg/L, the optimum conditions of its phosphorus removal are:potassium ferrate dosage of3mg/L, oxide segments pH of4.0, the oxidation time of10min, polymerization of sulfuric acid iron dosage of15mg/L the the flocculation segment at pH8.0, the flocculation time of30min. the phosphorus removal rate can reach about80%water phosphorus content can be reduced to about0.3mg/L, reaching A standard at the national level.(2) The phosphorus content in the raw water is1mg/L, the optimal conditions for phosphorus removal:potassium ferrate dosage of2mg/L, oxidizing pH4.0, oxidation time10min, PFS dosage of15mg/L, the flocculation segment pH8.0, the flocculation time of30min. the phosphorus removal rate can reach more than60%, the effluent phosphorus content can be reduced to about0.4mg/L, up to the national A standard.(3) Of the strong oxidation of potassium ferrate and polymeric ferric sulfate and phosphorus removal mechanism is the use of potassium ferrate, it can be oxidized in the water to block the floc sedimentation of organic matter, at the same time, potassium ferrate and polymeric ferric sulfate the intermediates and of Fe (Ⅲ) adsorption and flocculation phosphorus Under these conditions, phosphate precipitation mainly based on chemical complexation since as long as the role, rather than based on electrical properties and the main. Ferrate as traditional oxidant alternatives in dealing with urban sewage bring some environmental effects, it also brings certain economic effect.