Pilot-scale Study of Anaerobic Fludized-bed Membrane Bioreactor for Treating Different Strength of Wastewater

  • 劉 成彬

Student thesis: Master's Thesis

Abstract

Water one of the nature resources is essential for human In Taiwan because of the steep terrain and uneven rainfall distribution available water resource is very low According to water resources agency there are three main water consumption sources in Taiwan One is agriculture consumption (71%) another is domestic consumption (20%) and the other is industrial consumption (9%) Therefore how to treat these three kinds of wastewater to reach the goal of water reuse is big issue needed for consideration Recently anaerobic process has become popular because of lower energy consumption and fewer waste sludge production One of the treatment process known as anaerobic fluidized bed membrane bioreactor (AFMBR) is combined anaerobic fluidized bed (AFB) with membrane bioreactor (MBR) Pilot-scale AFMBR has been successfully used to deal with domestic wastewater but to treat different kinds of wastewater by AFMBR system still needs more research support The objective of this study is to investigate the feasibility of pilot-scale anaerobic fluidized bed membrane bioreactor (AFMBR) treating low medium and high strength of wastewater These three different strengths of wastewater are shrimp wastewater TFT-LCD wastewater (supernatant of sedimentation tank) and semiconductor wastewater GAC adsorption tests are conducted before using AFMBR to treat wastewater The results show that after 4 92 days of operation of AFMBR to treat shrimp wastewater TOC adsorption effect will be carried out and biological effect will be dominant in the rest of operation days Similarly after 30 62 days of operation of AFMBR to treat semiconductor wastewater COD TOC and DMSO adsorption effect will be carried out and biological effect will be dominant in the rest of operation days First when using AFMBR to treat shrimp wastewater TOC in the treated white leg shrimp wastewater is about 1 mg C/L and TOC removal is about 91% This indicates that the goal of carbon removal in shrimp wastewater by AFMBR is achieved effectively Additionally after conducting the denitrification batch experiment the heterotrophic denitrification can be the mechanism of TOC degradation in shrimp wastewater treatment Second using AFMBR to treat TFT-LCD wastewater COD removal total COD removal and TOC removal are 73% 92% and 89% respectively In addition this wastewater contains high molecular weight (about 106 Da) soluble substances which can be called extracellular polymer or colloidal COD It also contains soluble microbial by-products-like substances humic acid-like substances sulfonic acid-like substances and little aromatic hydrocarbon protein-like substances These four types of substances were found in the influent and there is the decrease of intensity of four types in the reactor and the effluent Therefore it is inferred that GAC microorganisms or membranes in the reactor have the potential to remove these four types of substances Third in the batch experiments of semiconductor wastewater treatment the sludge from full scale UASB has the potential to degrade DMSO in semiconductor wastewater to produce methane DMS and H2S Additionally the higher S0/X0 ratio is the higher specific DMSO degradation rate is Thus there is an evidence that there is no inhibition of DMSO degradation by the sludge from full scale UASB Moreover when using AFMBR to treat semiconductor wastewater DMSO removal is 100% in three periods of AFMBR operation The COD removal and TOC removal can be 95% and 94% respectively Finally there are about 35% of CH4 57% of CO2 1% of DMS and 7% of H2S contained in gas composition of the third period Furthermore the mechanism of DMSO degradation in AFMBR is that DMSO are degraded first into DMS further to MS and finally to H2S The contribution of GAC and sludge in DMSO removal are 43% and 57% respectively This reveals that both of two inoculums almost have the same contribution to degrade DMSO in semiconductor wastewater by using AFMBR However the microorganisms attached on GAC produce more methane in AFMBR for the purpose of methane production And Methanomethylovorans species are the important species to degrade DMSO not only to produce methane but also to form its by-products such as DMS MS and H2S in this AFMBR system At last it can be found that using AFMBR to treat semiconductor wastewater has potential to not only get good quality of effluent for water reuse but to produce methane for energy recovery
Date of Award2017 Aug 17
Original languageEnglish
SupervisorLiang-Ming Whang (Supervisor)

Cite this

Pilot-scale Study of Anaerobic Fludized-bed Membrane Bioreactor for Treating Different Strength of Wastewater
成彬, 劉. (Author). 2017 Aug 17

Student thesis: Master's Thesis