The Research On Polyethylene Oxide And Polyvinyl Alcohol Gel Balls Used In Waste Water To Remove Inorganic Phosphorus

In recent years, immobilization technology on the sewage treatment has more and more widely application. Using of the technology, will enable the proliferation of material into the porous internal carrier, or the use of polymer gel will be in the form of material embedded in its interior so as to achieve the purpose of absorption of pollutants. In many immobilized materials, sodium alginate, polyethylene oxide, polyvinyl alcohol etc have been widely used.In this paper, the application of immobilization technology, sodium alginate, polyvinyl alcohol and polyethylene oxide to cross-link, preparation of the gel particles to absorb inorganic phosphorus in the water, studying the adsorption effect and its adsorption mechanism so as to develop a new type of absorption materials, but also can provide a reference value for research in the field. Comparing phosphorus removal with the existing methods, the method is simple; efficient; and the gel balls can be recycled.In polyethyleneoxide-sodium alginate (PEO-SA) gel balls to remove inorganic phosphorus experiment, the best experimental condition is the mass fraction of cross-linking agent 0.5%, pH = 1.Adsorption equilibrium time is 2 hours. PEO-SA-Fe gel balls and PEO-SA-Ca-Fe gel ball have more than 97% removal efficiency. When the pH value of simulated wastewater is 8, PEO-SA-Ca-Fe gel balls can achieve 99.2% removal rate. PEO-SA-Ca-Fe gel balls can be better recycled. Quasi-dynamic equations can have a good description of the PEO-SA-Ca-Fe gel balls adsorption process, mainly controlled by particle diffusion. Freundlich adsorption isotherm can be a better description of PEO-SA-Ca-Fe gel balls on the adsorption behavior of inorganic phosphorus.In polyvinyl alcohol-sodium alginate (PVA-SA) gel balls to remove inorganic phosphorus experiment, when the mass fraction of cross-linking agent 0.5%, pH = 2 for the best experimental conditions. When PVA-SA-Fe gel balls and PVA-SA-Ca gel balls have 2 hours adsorption time, the reaction achieves a balance; PVA-SA-Ca-Fe gel balls have 6 hours adsorption time, the reaction reaches a balance, and have more than 90% removal efficiency. The best pH value is 9, the removal rate of PVA-SA-Ca-Fe gel balls is 97.5%. PVA-SA-Ca-Fe gel balls can be a very good recycling, the main factors is the hydrochloric acid and Fe³⁺. Quasi-dynamic equations can have a good description of the PVA-SA-Ca-Fe gel balls adsorption process. Freundlich adsorption isotherm model can better describe the PVA-SA-Ca-Fe gel balls on the adsorption behavior of inorganic phosphorus.By comparing PEO, PVA gel balls adsorption inorganic phosphorus find that the difference between them: mechanical strength of PEO gel balls is stronger than PVA gel balls. Freundlich type isotherm can be a very good description of the two gel balls adsorption behavior, the adsorption ability of PEO gel balls is higher than PVA gel balls.Embedded in the activated carbon in the gel balls of inorganic phosphorus adsorption experiments, conclusions as follow: balance time of four gel balls with powdered activated carbon which adsorption of inorganic phosphorus is 2 hours, PEO-SA-PAC gel balls has the most adsorption efficient. The best experiment temperature is 30℃, and it is an exothermic reaction. Quasi-dynamic equations can be a good description of the PEO-SA-PAC gel balls on the adsorption behavior of inorganic phosphorus.Langmuir isotherm equation can better describe the PEO-SA-PAC gel balls on the adsorption behavior of inorganic phosphorus and it is a monolayer adsorption reaction.