GPE 2007 - Utilization of the Coagulation Diagram in the Evaluation of the Natural Organic Matter (NOM) Removal for Obtaining Potable Water

摘要

The natural organic matter (NOM) is a mixture of many organic compoundsnthat can be dispersed in superficial water. The NOM is due to the compoundsnformed in the biologic degradation process of the vegetable organic matter and itsninteraction with the clay and the other hydrographic basin soil constituents, besidesnalgae and other microorganism activity. Many researchers have obtained resultsnthat indicate that the coagulation/flocculation process is an effective processnin the NOM reduction without committing the non-stabilization colloidal particles.nSo, with the intuit to guarantee a better final water quality in the water treatmentnplants, different studies were evaluated based on the coagulation diagram fornobtaining the best concentration of the chitosan coagulant as function of the pHnfor the NOM removal for obtaining potable water. The data for the coagulationndiagram construction will be obtained by a series of tests in a jar-test apparatus.nDifferent concentrations of the coagulant solution (0.1% w/v of chitosan) will benstudied. The pH will be varied (4.0 – 8.5) with sodium hydroxide solution (NaOH)nand hydrochloric acid (HCl) 25 and 50%. The rapid mixture gradient, the coagulationntime, the slow mixture gradient and the flocculation time will be maintainednconstant during this experiment. The process efficiency will be evaluated by thencolor, turbidity and compounds with absorption in UV-254nm removal. The bestnresults of removal were found for the chitosan in the concentration of 1.0mg/Lnand pH between 4.0-5.0, approximately.