【摘要】 采用自行设计的新型结构A/O生物流化床处理食品加工废水,处理规模为800 m3/d。当进水COD、NH3-N、SS和油浓度分别为957.6-6 841.4、11.5-42.3、50.3-982.5和6.2-22.7mg/L时,处理出水水质能达到GB 8978—1996中的一级排放标准。A段新型射流曝气内循环厌氧流化床通过生物气和废水共同循环,实现了废水与污泥充分混合,在回流比为1.2、HRT为24 h、容积负荷为2.06-3.96 kg/(m3.d)的条件下,可去除约80%的COD,最高产气量达到180.5 m3/d。O段新型卧流式好氧三相流化床在高长和高宽比为0.47和0.64时,较好地实现了流态化。此外,流化床内高效三相分离区的成功设计,维持了反应器内污泥的高浓度,为高效率、低能耗的稳定运行提供了保障。更多还原

【Abstract】 The self-designed new A/O biological fluidized bed was used to treat food processing wastewater.The designed capacity is 800 m3/d.When the influent concentrations of COD,NH₃-N,SS and oil are 957.6 mg/L to 6 841.4 mg/L,11.5 mg/L to 42.3 mg/L,50.3 mg/L to 982.5 mg/L and 6.2 mg/L to 22.7 mg/L respectively,the obtained effluent quality can meet the classⅠcriteria of Integrated Wastewater Discharge Standard（GB 8978-1996）.Biogas and wastewater are co-recycled in the new jet aeration internal-loop anaerobic fluidized bed,the wastewater and anaerobic sludge are mixed enough in it.When the recycle ratio,HRT and average volume loading are 1.2,24 h and 2.06 kg/（m3·d）to 3.96 kg/（m3·d）respectively,the COD removal rate and the largest biogas production can reach about 80% and 180.5 m3/d respectively.In the new horizontal aerobic three-phase fluidized bed,the ratio of height to length and width is only designed at 0.47 and 0.64,but there is good fluidization effect in this reactor.Otherwise,the three-phase separator is designed successfully so that the high biomass concentration is kept in the two new reactors,which ensures high efficiency and low energy consumption of industrial organic wastewater treatment.更多还原