COLOUR AND ORGANIC COMPOUNDS REMOVAL OF REACTIVE BLUE 19 TEXTILE DYE USING MONOPOLAR CONFIGURATION ELECTROCOAGULATION METHOD

• Main Author: Jonanda, Novelia
• Format: Theses
• Language: Indonesia
• Subjects: Teknik saniter dan perkotaan; teknik perlindungan lingkungan
• Online Access: https://digilib.itb.ac.id/gdl/view/70847
• Institution: Institut Teknologi Bandung

Dye is one source of contaminants commonly found in aquatic environments, because it has a structure with complex moleculs, so its can be difficult to process. The textile industry is a sectors that consume large amounts of dyes, and produce major pollutants in the form of dyes about 10-15% of unused dyes, which must be released as waste, generally coming from the dyeing process. Reactive dyes are one of the dyes commonly used in the textile industry in Indonesia. Reactive Blue 19 is one type of reactive dye that will be used, this dye is carcinogenic for organism, resistant to degradation and difficult to remove by conventional processing. Electrocoagulation is one of the most researched technologies because it can produce clear effluent with shorter detention time and produce easily regulated and small amount of floc sludge. In this study, the synthetic dye reactive blue 19 was processed in batch using Al electrocoagulation with monopolar configuration. The purpose is to assess the effectiveness of removal of color and organic compound reactive blue 19 based on the variation of color concentration parameters, NaCl and electric current in electrocoagulation processing with monopolar parallel and series configuration, then to determine the optimum processing conditions and calculate the processing cost requirements in terms of electrical energy and electrode usage. In this research, variation of parameters used were initial dye concentration of 50.75, 100 and 150 mg/L; NaCl concentration of 1, 2.5 and 5 grams / L and electric current of 0.5, 1 and 1.5 A at 60 Minutes. The results showed that the optimum conditions obtained at the color concentration of 75 mg/L, NaCl 5 grams/L and the optimum electric current of 1.5 A with organic compound removal efficiency of 77.07% and removal of color of 99.0992% with Al ion release rate of 0.0094 grams / min in parallel monopolar. While the monopolar series can produce organic compound removal efficiency of 77.27 and 99.10 % removal of color with Al release rate of 0.0092 grams / minute. From the results of SEM-EDS on electrocoagulation floc, it is known that the composition of parallel monopolar electrocoagulation floc is O (44.26%), Na (2.09%), Al (48.94%) and Cl (4.71%). While the results of monopolar electrocoagulation Floc series are O (43.14%), Na (3.39%), Al (47.18%) and Cl (6.28%). At the time of processing, there is a change in the pH in the reactor, where the pH changes from acid to base, due to the reduction of water at the cathode. However the best organic compound allowance can be obtained at acidic pH values due to the dominant form of Al(OH)3(s). Changes in conductivity also occur during processing, where an increase in conductivity results in a decrease in cell voltage at a fixed current density and a decrease in power consumption in eletrolite cells. The higher the NaCl value, the removal efficiency increases because NaCl is an oxidizing agent, but will decrease when NaCl is excessive, because there is an increase in OH ions - which form nonactive species for coagulation. Then the higher the electric current, the conductivity will increase so that it accelerates the oxidation and reduction reactions on the electrode plate, then the conductivity decreases, due to the obstruction of the oxidation process on the electrode due to the resulting Floc. Kinetics rate of the electrocoagulation reactor follow the first order reaction, where the reaction yield is determined by only one reactant. Monopolar parallel processing cost is estimated at Rp 17,821/m3 while series monopolar electrocoagulation processing cost is estimated at Rp 20,507 / m3 . For operating costs per kg of color, estimated at Rp 8,632,27/kg soluble dyes for monopolar parallel, while for the series is estimated at Rp 5.173,42/kg soluble dyes. From the results of the hypothesis Test t-Test 2 samples can be concluded that the processing of parallel monopolar is more effective in removing pollutants than the series monopolar. So in accordance with the hypothesis in this study.