Summary of Doctoral thesis Chemical engineering: Study on internal electrolysis combine with AAO-MPPR to treat TNT wastewater

This dissertation focuses on establishing the process of manufacturing bimetallic Fe / Cu internal electrolysis nanomaterial, thereby studying some characteristics correlation between corrosive line and TNT decomposition kinetics and time. Setting and optimizing the internal electrolysis process by bimetal Fe / Cu nanomaterials combined with biological method A2O-MBBR (moving bed Biological reactor) to treat TNT wastewater at laboratory scale and Pilot scale at the scene.
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Summary of Doctoral thesis Chemical engineering: Study on internal electrolysis combine with AAO-MPPR to treat TNT wastewaterMINISTRY OF EDUCATION VIETNAM ACADEMY OF AND TRAINING SCIENCE AND TECHNOLOGYGRADUATE UNIVERSITY OF SCIENCE AND TECHNOLOGY VU DUY NHANSTUDY ON INTERNAL ELECTROLYSIS COMBINE WITH AAO-MBBR TO TREAT TNT WASTEWATER Speciality: Chemical Engineering Code: 9 52 03 01 PhD DISSERTATION SUMMARY ON CHEMICAL ENGINEERING Ha Noi - 2020The work was completed at:Vietnam Academy of Science and TechnologyScience instructor:1. Assoc. Prof. Le Thi Mai Huong2. Prof. Le Mai HuongReviewer 1:Reviewer 2:Reviewer 3:The dissertation will be presented in front of Dissertation EvaluationCouncil at Institute level at the Institute of Natural ProductsChemistry - Vietnam Academy of Science and Technology, No. 18Hoang Quoc Viet, Cau Giay, Hanoi.At , / /The dissertation can be found at: 1, National Library of Viet Nam 2, Library of Institute of Natural Products Chemistry - Vietnam Academy of Science and Technology I. INTRODUCTION 1.1. Background 2,4,6 trinitrotoluene (TNT) is a chemical widely used in defenseand economy. The explosive manufacturing industry discharges alarge amount of wastewater containing toxic chemicals such as TNT.In fact, about 50 years after World War II, in places where gunpowderfactories were built, large amounts of TNT and their isomers werefound in soil and water environments [1, 2, 21]. This proves that TNTis capable of long-term survival in nature or in other words, TNT isdifficult to biodegrade. In our country, besides the factories isproducing ammunition, explosives, and launchers in the defenseindustry, there are still a large amount of wastewater containing TNTwhich needs to be treated in warehouses for repairing and collectingammunition. The commonly methods are used to treat wastewater containingTNT including: physical method (adsorption by activated carbon,electrolysis); chemical method (Fenton, UV - Fenton, internalelectrolysis), biological method (aerobic activated sludge, MBBR,UASB, MBR, plants, enzymes, white rot fungi). These measures maybe used independent or combination with each other, depending onthe nature of the wastewater and the material facilities and economicconditions of the manufacture establishment. This dissertation focuses on establishing the process ofmanufacturing bimetallic Fe / Cu internal electrolysis nanomaterial,thereby studying some characteristics correlation between corrosiveline and TNT decomposition kinetics and time. Setting andoptimizing the internal electrolysis process by bimetal Fe / Cunanomaterials combined with biological method A2O-MBBR(moving bed Biological reactor) to treat TNT wastewater at laboratoryscale and Pilot scale at the scene. At the same time, the first stepestablishing the control automatic or semi-automatic operationsoftware with the conditions of the treatment process are determined. 1 1.2. Research objectivesBimetal Fe / Cu internal electrolytic nanomaterialsInternal electrolysis method and biological method A2O - MBBR totreat wastewater containing TNT 1.3. New contributions 1.3.1. Successfully fabricated bimetallic Fe / Cu electrolyticinternal materials with average size of 100 nm, potential (voltage) E0 =0.777 V. In electrolyte solution pH=3 with TNT concentration of 100mg/L, corrosive current is reaching 14.85*10-6 A/cm2 and corrosionspeed reach 8. 87*10-2 mm / year. Therefore has increased the reactionrate, processing efficiency is higher, faster. Concurrently, It has beendetermined corrosion current and its relationship with LnCt / C0 dependon the duration of the TNT reduction process by the corrosion currentmeasurement method. There has not been any announcement using thismethod. Some related publication determined the relationship betweenTNT reduction speed and reduction speed of H+ to H2. 1.3.2. Establishing TNT treatment technology by combining theinternal electrolysis method using bimetal Fe/Cu nanomaterials withbiological method A2O-MBBR. Nowadays, no announcement hasbeen made which combined these two methods to treat wastewater.The microorganisms in the A2O-MBBR system used to treatwastewater containing TNT has been identified, among them twostrains can be new: Novosphingobium sp. (HK1-II, HK1-III) havebootstrap value of 97.4-97.92% to Novosphingobium sediminicola sp.and Trichosporon (HK2-II, TK2-II and HK2-III) have bootstrap valueof 97.7% to middelhonenii sp. These two species were published onthe international gene bank with the code GenBank: LC483151.1;LC483155.1 and the corresponding ...