The treatment of high strength protein wastewater by UASB system

• Main Authors: Ploypatarapinyo, P., Natpinit, S., Jenvanitpanjakul, P.
• Format: Article
• Language: English
• Published: Prince of Songkla University 2006-01-01
• Series: Songklanakarin Journal of Science and Technology (SJST)
• Subjects: high strength protein wastewater; UASB; granulation; biogas; methane gas
• Online Access: http://www.sjst.psu.ac.th/journal/28_1_pdf/20_wastewater_treatment.pdf

The objective of this investigation was to treat the high strength protein wastewater by UASB system. The wastewater of this experiment had COD 2,938 mg/l, SS 478 mg/l and total of nitrogen 435 mg/l. The granule was developed from bacteria of activated sludge system as suspended sludge by fermenting anaerobically at 40ºC for 1 month and acclimatizing with the high strength protein wastewater for another month. The MLSS and MLVSS of the started bacterial sludge were 7,105 mg/l and 5,360 mg/l respectively.The maximum organic volume loading of this system was 6 kg COD/m3.d at the hydraulic retention time 12 hrs. The efficiency of COD and BOD removal was 88.38 and 93.07% respectively. The biogas production was 0.52 l/g CODr.d. The content of methane gas was 76.20%. The bacterial suspended sludge was developed to granular sludge with the granule's size of <0.25 mm, 0.25-0.5 mm, 0.5-1.0 mm and >1.0 mm as 86.02%, 2.05%, 11.84% and 0.09% respectively.