Industrial Wastewater Treatment Using a Submerged Anaerobic Membrane - PDF

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Industrial Wastewater Treatment Using a Submerged Anaerobic Membrane - PDF Powered By Docstoc
					      University of               PO Box 4400                  Tel 506 453-4521          Department of Civil Engineering
                                                               Fax 506 453-3568
      New Brunswick               Fredericton, NB
                                                               civileng@unb.ca
                                  Canada E3B 5A3




                            Notice Of University Oral Examination
                              Master Of Science In Engineering

     Industr ial Wastewater Tr eatment Using a
   Submer ged Anaer obic Membr ane Bior eactor

                                           Andrew Hulse
                                   DATE:              Friday - September 11, 2009
                                   TIME:              2:30 pm
                                   LOCATION:          ADI Studio – C 25

                         A copy of the thesis is available in the CE Office for the period Sept 4-11th

                                                    Examining Committee

                      Supervisor            Dr. Kripa Singh
                      Reader                Dr. Katy Haralampides
                      Reader:               Dr. Robert Landine
                      External Reader:      Dr. William Cook, Department of Chemical Engineering

ABSTRACT - A submerged anaerobic membrane bioreactor (sAnMBR) was studied for the
treatment of a high organic strength wastewater containing a high level of suspended solids. A
25L reactor was operated, under mesophilic conditions (35°C), for 244 days treating a blend of
primary clarifier sludge and centrifuge solids from a potato processing plant. The system
achieved volumetric loading rates from 3 to 10 kg COD/m3/d (0.1 to 0.43 gCOD/g VSS/d).
Organic removal was consistently high providing 99% COD and carbonaceous BOD (cBOD)
removal in effluent. Average COD and carbonaceous BOD were less than 300 mg/L and 50
mg/L, respectively during steady operating conditions. Suspended solids in the effluent were
less than 1 mg/L. Signs of system overload were observed as organic loading rate reached 8 kg
COD/m3/d. Methane production yield, from influent solids, decreased from 444 to 393 mL
CH4/gVSS/d as the organic loading rate increased. Operating at longer solids retention time
(SRT) provided higher methane yield due to the slow rate of hydrolysis. Operating flux
diminished from 0.28 to 0.11 m3/m2/d, as the OLR increased. Membrane fouling occurred as a
result of sludge cake formation caused by the accumulation of influent solids. Sludge cake
formation was determined as main factor controlling achievable operating flux. A second 25L
AnMBR system, treating synthetic wastewater, was operated for 316 days. Comparisons were
made between the treatment of completely soluble wastewater and particulate wastewater using a
sAnMBR. Performance analysis was based on treatment efficiency, bio-energy generation
potential, and the fouling of membranes.