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The wastewater used in the experiment was the actual waste-water from a food processing factory in Thailand and was collectedfrom the equalization tank using the composite sampling method.Upon the collection, the wastewater samples were refrigerated at4°C and stored until they were utilized. The typical characteristicsof discharged wastewater varied significantly depending on thetime and production schedule of the factory. The influent wastewa-ter characteristics during the study period are shown inTable 1.Itwas found that pH of fresh wastewater varied from 3.9 to 5.7,while biochemical oxygen demand (BOD) and chemical oxygen de-mand (COD) ranged from 300 to 5150 mg/l and 700 to 9750 mg/l,respectively. Additionally, total kjeldahl nitrogen (TKN) rangedfrom 1 to 35 mg/l and sulfate content varied from 10 to 485 mg/l. The average protein content of the food processing wastewaterwas determined as 78 mg/l.
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