PERFORMANCE OF A PILOT-SCALE ANOXIC/OXIC SYSTEM TREATING HIGH STRENGTH TOMATO-PROCESSING WASTEWATERS
Tomato-processing wastewaters generated from food-canning industry typically contain products such as seed, skin and high particulate and colloidal fractions. Treatment of tomato-processing wastewaters is very challenging due to their high strength, slow biodegradability and very poor settling characteristics as well as potential soluble nutrient limitation in the wastewaters. A pilot-scale anoxic/oxic–ultrafiltration (A/O) system was evaluated for the treatment of high-strength tomato processing wastewater to achieve stringent dry-ditch discharge criteria of SBOD <10 mg/L, TSS <10 mg/L, ammonia-nitrogen <3 mg/L and soluble phosphorus < 0.5 mg/L. The A/O system achieved 99.4 % SBOD removal, 91.9 NH3-N removal and 100% phosphorus removal at an overall HRT of 1.5 days and SRT of 5 days. The A/O system realized satisfactory biological nutrient removal in treating high-strength tomato-processing wastewater and offered the potential for future full-scale implementation.
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Document Type: Research Article
Publication date: 2005-01-01
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