Membrane Filtration of Poultry Processing Wastewater: I. Pre-DAF (Dissolved Air Flotation)
2012
Abboah-Afari, E. | Kiepper, B.H.
An experiment was conducted to measure the effects of membrane filtration on pre-dissolved air flotation (DAF) poultry processing wastewater (PPW). Bulk grab samples of raw PPW were collected after primary (1500 to 3000 μm) and secondary (500 μm) offal screens, but before additional wastewater treatment at a commercial broiler processing plant. Four (4) L subsamples of raw PPW were pre-sieved (106 μm) and then filtered using one of three membranes (0.3 μm polyvinylidene difluoride (PVDF), 0.1 μm Polysulfone, or 100,000 MWCO Ultrafilic) at one of two pressures (50 or 80 psi) for three 2 h trials. The resulting 3x2 treatments with 3 repetitions totaling 18 trials were completed over 6 weeks, 3 trials taking place 1 day per week. Mean chemical oxygen demand (COD) and total solids (TS) concentrations (mg/L) were determined for PPW samples prior to each trial. Mean permeate flux (L m-2 h-1 ) was calculated, and membrane permeate PPW samples were collected at 10 min intervals during each trial for subsequent COD and TS analyses. Results showed that mean COD and TS for raw PPW samples were 5263 and 3355 mg/L, respectively. Mean COD and TS for 106 μm pre-sieved PPW samples were 4390 and 2991 mg/L, representing 16.6% and 10.8% reductions, respectively. The maximum mean permeate flux of 115 L m-2 h-1 and TS reduction of 34% was obtained by the 0.3 μm PVDF membrane, while the maximum mean COD reduction of 89% was achieved by the 100,000 MWCO Ultrafilic membrane. Based on a calculated performance index (Pmi), the 0.3 μm PVDF membrane was determined to be the most effective membrane for pre-DAF PPW treatment.
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