Impact of non-biodegradable contaminants on long term performance of semi-industrial-scale MBR (membrane bioreactor) for dilute swine wastewater with direct reuse of treated water
Sustainable process-product development & green chemistry
Sustainable & Clean Technologies-I: Extraction & Remediation (T1-4P)
Keywords: KEY words : membrane bioreactor, swine wastewater, ultrafiltration, activated sludge, recycling.
High concentration of piggeries in a restricted area involves several environmental issues. Water quality and soils are damaged by an excess of different chemical compounds (mainly nitrate, phosphorous, organic matters and heavy metals). Air undergoes quality loss from unpleasant odours and greenhouse gas emissions. The European project “Zero Nuisance Piggeries” (Life Environment) proposes the implantation of a global management of pigs production waste streams. A semi-industrial-scale process using a plane ultrafiltration membrane was applied to treat dilute swine wastewater with direct reuse of treated water inside the piggery for flushing purposes. The process was developed in two continuous treatment steps : (1) a mechanical liquid/solid separation (centrifugation) of the fresh manure and (2) a two stages (aerobic/anaerobic) biological treatment by reaction/separation coupling (submerged ultrafiltration membrane bioreactor).
On one hand, this paper focuses on the influence of operational parameters (sludge loading rate, temperature, pollutants…) on suction pressure and flux in relation with the bioactivity for a long term experiment. With 100 h HRT and 30 days SRT, 90 % of COD, 85 % of ammonium and 100 % of SS could be removed. The observed biomass Yobs was ranging from 0.46 to 0.63 g VSS/g COD. The temperature was proved to influence both the bioactivity and the membrane fouling. On the other hands, the impact of the recycling of treated water is studied. The kinetic of non-biodegradable pollutants contamination allowed an acclimatization of the biomass and the process was proved to sustain high rate of heavy metals (Zn2+ and Cu2+). The fate of antibiotics in the process was studied. This experimental design allowed having a global overview on the best operational parameters of a membrane bioreactor to treat swine wastewater with reuse of treated water.
Presented Monday 17, 13:30 to 15:00, in session Sustainable & Clean technologies - I: Extraction-Remediation (T1-4P).
