摘要：

介绍了山东某食品公司高氮磷有机食品废水处理工程实例以及工艺特色，根据废水特点采用“絮凝初沉池+UASB+缺氧池+射流曝气池+絮凝终沉池”作为主处理工艺，主要处理构筑物均采用较长的水力停留时间（HRT）和较低的容积负荷，UASB的HRT为108 h、COD容积负荷为2.05 kg/（m³·d），A/O系统总HRT为62.4 h，初沉池和二沉池均采用较低的表面负荷，分别为0.43 m³/（m²·h）和0.525 m³/（m²·h），引入200 m³/h的原废水作为缺氧池反硝化脱氮的外加补充碳源。工程运行实践表明系统处理效果较好，对COD、BOD₅、SS、NH₃-N、TN、TP的总去除率分别为99.5%、99.5%、98.0%、99.4%、93.1%、99.2%，处理出水水质COD、BOD₅、SS、NH₃-N、TN、TP分别为48、15、61、1.0、18、0.8 mg/L，满足《山东省南水北调沿线水污染排放标准》（DB 37/599—2006）一般保护区及修改单的要求，处理成本为2.88元/m³。

关键词: 食品废水, UASB, A/O系统

Abstract:

A project case and its process characteristics on treating one organic food wastewater with high nitrogen and phosphorus load in a food company in Shandong Province was introduced. According to the characteristics of the raw wastewater，the main treatment process was chosen as primary settling tank with flocculation-UASB-jet aeration tank-final settling tank with flocculation. The main treatment facilities were designed with longer hydraulic retention time and lower volume load：HRT of 108 h and COD volume load of 2.05 kg/（m³·d） for UASB， total residence time of 62.4 h for A/O system， lower surface loads of 0.43 m³/（m²·h） and 0.525 m³/（m²·h） for primary and final settling tanks，respectively. A branch of the raw wastewater at a flow rate of 200 m³/h was introduced as additional carbon source for denitrification in the anoxic tank. The practical run of the system performed efficient treatment，and the total removal rates of COD，BOD₅，SS，NH₃-N，TN，TP were 99.5%，99.5%，98.0%，99.4%，93.1%，99.2%，respectively. The effluent concentrations of COD，BOD₅，SS，NH₃-N，TN，TP were 48，15，61，1.0，18，0.8 mg/L，respectively， which met the requirements of “Water Pollution Discharge Standard of Shandong Province Along the South-to-North Water Transfer Project”（DB 37/599—2006） in general conservation areas. The capital cost of the treatment was 2.88 yuan/m³.

Key words: food wastewater, UASB, A/O system

中图分类号: 

• X703