Piggery Wastewater Pretreatment by Physico-chemical Techniques
Keywords:
Piggery wastewater, acid coagulation, ammonia stripping, pretreatmentAbstract
This study was conducted to investigate the applicability of physico-chemical processes, namely acid coagulation and ammonia stripping for a pretreatment of wastewater from pig farming under laboratory conditions. The processes were found to achieve high removal efficiencies of organic compounds and nitrogen compounds in piggery wastewater. The results showed that at velocity gradient (G) 560 s-1 and contact time of 10 min, the COD removal efficiency was achieved at 60% - 75% with pH ranged from 3.5 to 4.5. The application of acid coagulation process increased biodegradable ratio (BOD/COD) to 20% - 28% from the initial BOD/COD ratio. Followed by stripping process, ammonia in the wastewater was removed at the efficiency of 90% at G 2,850 s-1 with pH between 11 and 12 for contact time of 6 h. Such high efficiencies of acid coagulation and ammonia stripping processes showed high the potential application for the pretreatment of piggery wastewater. However, the application of these processes would require further treatment in a biological treatment system in order to reduce organic and remaining nitrogen compounds to meet the Thai effluent standards allowed for pig farming.
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