| Summary: | 碩士 === 嘉南藥理科技大學 === 環境工程與科學系暨研究所 === 97 === This study was aimed at investigating the performance of a laboratory scale hybrid submerged membrane bioreactor (HMBR) for the co-treatment of septic tank effluent and landfill leachate. Sponge pellets were introduced into MBR tank to conduct a hybrid MBR system.
The indicators employed for examining the performances of the system were as follows: pH, dissolved oxygen (DO), temperature, mixed liquid suspended solid (MLSS), mixed liquid volatile suspended solid (MLVSS), chemical oxygen demand (COD), total organic carbon (TOC), specific oxygen uptake rate (SOUR), sludge density index (SDI), total dissolved solids (TDS), extracellular polymeric substances (EPS), total Kjeldahl nitrogen (TKN), NH4+-N, Org-N, NO2- -N, NO3- -N, alkalinity, true color (ADMI), turbidity, scanning electron microscope (SEM) analysis, energy dispersive x-ray spectrometer (EDS) analysis, trans-membrane pressure (TMP) and flux.
The highest removals of TCOD (94%) and SCOD (84%) were found at stage 2. The removal efficiency increased with the increase of influent levels. For HMBR, the highest TOC removal of 96% was obtained from stage 4. According to the experimental observation, the sludge foaming in the initial stage was serious and most MLSS eventually attached onto the sponge. The results indicated that the introduction of sponge pellets could enhance the removal efficiency and significantly improve the permeability of MBR system for treatment of septic tank effluent/landfill leachate mixed liquid. It also demonstrated that the sponge carrier was with a strong capability to enhance the color removal in a hybrid MBR system.
The results showed that the removal efficiencies of metal Mg, Ca, Cr, Fe, Mn, Ni and Ba are 24.2%(43.4－32.9ppm), 36.3 % (44.4－28.3 ppm), 68.8 % (0.77－0.24 ppm), 86.2 %(1.67－0.23 ppm), 75.3 %(0.19－0.047 ppm), 40.5 % (0.153－0.091 ppm), 53.3 %(0.075－0.035 ppm), respectively.
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