COMBINED USE OF TECHNICAL TEXTILES FOR WASTEWATER TREATMENT: PHYSICAL AND CHEMICAL SEPARATION AND PHOTODEGRADATION UV- H2O2
DOI:
https://doi.org/10.5902/223611706244Keywords:
Efluentes Têxteis, Coagulação, Floculação, Fotoquímica.Abstract
http://dx.doi.org/10.5902/223611706244
This study aimed to assess the combined technique (chemical and physico-oxidation),which is based on application of coagulant, followed by the use of UV in combination withhydrogen peroxide (H2O2), in order to degrade the organic matter present in a textile effluent.The experiments were divided into two stages, the first step was sought to a reference to thecoagulation process, in terms of operational variables to direct characterization of the pH to saidto be "ideal" and to thereafter, effecting a scan to determine the dosage of coagulant reagent, necessary to obtain satisfactory levels of efficiency (removal of turbidity greater than 80%). Thetesting of jar was carried out with pH adjustment (3.0 to 12.0 with change 2.0) and the insertion ofthe coagulating agent (10 to 300 mg / L). The results indicate the optimal conditions at pH 3,0,with the addition of 100mg / L of the coagulant, aluminum sulfate Al2SO4. All experiments weredone at room temperature. The second process step is the treatment of the supernatant resultingfrom the first step, using the oxidation process, performed in a photochemical reactor with propertemperature control, emission of radiation (via a mercury vapor lamp middle pressure free bulb).During the experiments the temperature was kept constant at 37.5 ° C (derived from the heatgenerated by the lamp), by passing the cooling water system. We used a relation of 1 L to 0.1 Leffluent of hydrogen peroxide (102 g/L), then the mixtures were subjected to agitation, followedby continuous exposure to UV for 120 minutes. The reactions were monitored by chemical oxygendemand (COD) and turbidity. The results for the removal of Chemical Oxygen Demand (COD) wereapproximately 80% and reduced turbidity to values of about 1.8 NTU.
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