序批式生物膜反应器预处理餐饮废水的性能

Performance of Sequencing Batch Biofilm Reactor for Pretreatment of Restaurant Wastewater

基于分散式餐饮废水纳管超标排放的现状,尝试将序批式生物膜反应器(SBBR)拓展用于某西式快餐店洗涤废水的预处理。室温下将SBBR接种挂膜并长期运行,提出了固定弹性填料高填充率(>70%)的快速启动(12d)方法,在进水COD为1938mg/L.SS为760mg/L、动植物油为120mg/L、换水比为40%、曝气时间为10h的工况下,反应器对以上3种污染物的年均去除率分别达到90%,74%和80%,出水水质满足纳管要求且受温度的影响较小。设置隔油池有利于SBBR的长效运行,污泥产率仅为0.15kgSS/kgB0D5O原水波动时,关联于曝气量和换水比的DO周期变化曲线可作为监控SBBR碳氧化进程及供氧终点的控制参数,相关一体化设备可为我国众多餐饮企业治污提供帮助。

Based on the present situation of excessive discharge of decentralized restaurant wastewater, a sequencing batch biofilm reactor ( SBBR) was applied to pretreat washing wastewater from a western fast food restaurant. Through attachment of biofilm and long-term operation of the SBBR at room temperature, a rapid start-up strategy (12 days) with high filling rate (> 70%) of elastic packing was proposed. Under the conditions of influent COD of 1 938 mg/L, SS of 760 mg/L, animal and vegetable oil of 120 mg/L, water exchange ratio of 40% and aeration time of 10 hours, the annual average removal rate of the pollutants were 90%, 74%, 80%, respectively, and the effluent quality could meet the emission requirements and was less affected by temperature. Installation of oil separation tank was found to be beneficial to long-term operation of SBBR, and the sludge yield was only 0. 15 kgSS/kgBOD5. The DO periodic curve correlated with aeration intensity and water exchange ratio could be used as a controlling parameter to monitor the carbon oxidation process and oxygen supply terminal point of SBBR when the influent fluctuated, and the related integrated equipment would provide a choice for pollution control of many small catering enterprises in China.