Manometric study of CO2 and H2S emission from aqueous solutions and wastewater |
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| Institution: | 1. Zhejiang Provincial Key Laboratory of Solid Waste Treatment and Recycling, School of Environmental Science and Engineering, Zhejiang Gongshang University, Hangzhou 310012, China;2. College of Quality and Safety Engineering, China Jiliang University, Hangzhou 310018, China;3. School of Civil Engineering and Architecture, Zhejiang University of Science and Technology, Hangzhou 310023, China;1. Institute of Environmental Engineering, National Sun Yat-sen University, Kaohsiung 804, Taiwan, ROC;2. State Key Laboratory of Urban Water Resources and Environments (SKLUWRE), Harbin Institute of Technology, Harbin 150090, China;2. Energy Environment Policy and Technology, Greenschool, Korea University-KIST, Seoul 136-701, Korea;1. WG Environmental Health, Unit for Physiology and Biophysics, University of Veterinary Medicine Vienna, Veterinärplatz 1, A 1210 Vienna, Austria;2. Central Institute for Meteorology and Geodynamics, Department of Environmental Meteorology, Hohe Warte 38, A 1190 Vienna, Austria;1. Department of Chemical Engineering and Technology, Centre of Advanced Study, Indian Institute of Technology, Banaras Hindu University, Varanasi 221005, India;2. Applied Chemistry Department, S.V. National Institute of Technology, Surat 395007, Gujarat, India;3. Department of Civil and Environmental Engineering, The Hong Kong Polytechnic University, Hung Hom, Kowloon, Hong Kong, China;4. Department of Environmental Engineering, Yonsei University, Wonju 26493, Republic of Korea;5. Department of Nano Science and Materials, Central University of Jammu, Jammu 181143, India;6. Department of Civil and Environmental Engineering, Hanyang University, 222 Wangsimni-Ro, Seoul 04763, Republic of Korea |
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| Abstract: | The emissions of CO2 and H2S from the aqueous solutions and wastewater were studied to determine and compare the times required to reach the equilibrium of H2S and CO2 between water and gas phases. The solutions of NaHCO3 and NaHS were acidified and the change in the pressure of emitted gases was measured with a manometric OxiTop® system. The average time required to achieve the equilibrium state of distribution of CO2 between two phases was 16.7±1.5 min, and it did not depend on the initial amount of NaHCO3 in the solution. The average time required to achieve the equilibrium of H2S (sulfide) was 19.5±5.5 min, having the same value for solutions with different initial contents of sulfide ions. The average time required to achieve the equilibrium of H2S in the wastewater was 16.2±3.6 min, and it showed the faster emission of gaseous H2S to decrease the oversaturation of the solution. The ratio of measured values of pressure to the calculated values did not depend on the concentration of NaHS in the initial solution, and its average value was 0.86±0.14. The results showed that measured values of pressure of H2S emitted from the wastewater were twice lower than the calculated values and it is necessary to take into account the catalyzed formation of polysulfide in the solution of sulfides. |
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