Biological treatment of organic wastewaters from semiconductor industry using Anaerobic process and Aerobic Membrane Bioreactor

  • 雷 媛媛

Student thesis: Master's Thesis

Abstract

In this study the feasibility and optimal condition for biodegradation of organic wastewater provided by semiconductor industry was investigated Dimethyl sulphoxide (DMSO) was the main component of the organic wastewater Therefore the DMSO biodegradation efficiency was discussed in this study by using membrane bioreactor (MBR) and several batch tests to treat the wastewater from semiconductor industry Besides molecular biotechnology was applied to understand the microbial population of DMSO biodegradation under aerobic and anaerobic conditions respectively Under aerobic condition MBR system was used to test the DMSO degradation efficiency The results showed that high DMSO concentration would inhibit the DMSO degradation When the inflow DMSO concentration decreased from 1000 mg/L to 250 mg/L DMSO degradation efficiency increased from 4 % to 39 % Furthermore from the results of polymer addition batch test it took at least 50 hours to fully degrade 250 mg/L of DMSO concentration For the aerobic microbial part that Hyphomicrobium sp was the most dominant species of DMSO-degrading bacteria However the influence of DMSO degradation efficiency might reflect on the changing abundance of Hyphomicrobium sp Thiobacillus sp and ammonia-oxidizing bacteria Under anaerobic condition the result showed lower S0/X0 ratio could get higher specific DMSO degradation rate Furthermore it was speculated that DMSO degradation was inhibited when DMSO concentration was higher than 4000 mg/L For the anaerobic microbial part it showed that not only Methanomethylovorans but also Methanosarcina Methanolobus zinderi Methanomethylovorans Methanosaeta and an unknown methanogens species were all contributed to anaerobic DMSO degradation Particularly unknown methane bacteria seemed to have the ability to use DMS as substrate However DMS accumulation could be solved via aerobic batch test with closed system DMS transferred to sulfate under aerobic conditions effectively Hence by combining anaerobic and aerobic biological treatment process to treat organic wastewater of semiconductor industry was a feasible way in this study And the optimal operation under aerobic condition was DMSO concentration lower than 250 mg/L with 50 hours of HRT and the optimal operation under anaerobic condition was DMSO concentration lower than 4000 mg/L
Date of Award2016 Aug 15
Original languageEnglish
SupervisorLiang-Ming Whang (Supervisor)

Cite this

Biological treatment of organic wastewaters from semiconductor industry using Anaerobic process and Aerobic Membrane Bioreactor
媛媛, 雷. (Author). 2016 Aug 15

Student thesis: Master's Thesis