厌氧时间对间歇进水-间歇曝气的好氧颗粒污泥系统影响

Temporal Anaerobic Effect on Aerobic Granular Sludge with Intermittent Influent-Intermittent Aeration

为启动生活污水AGS工艺,实验以间歇进水-间歇曝气方式运行,降低硝氮浓度,减轻对PAO的抑制,利用除磷中产生的磷酸盐沉淀和正电微粒促进颗粒化实现.接种污水厂污泥于SBR反应器R1、R2、R3和R4中,在总厌氧时间为30、60、90和120 min时,研究厌氧时间对生活污水AGS系统的影响.实验表明,R1、R2、R3和R4历时56、48、39和35 d启动成功;运行105 d,平均粒径达750、764、791和650μm.运行期间,R1和R2在43 d和47 d除磷恶化,延长厌氧时间至90 min后恢复;R3处理效果良好;R4在63~77 d颗粒解体,处理效果下降,DPAO富集程度降低.运行后期,R1、R2、R3和R4出水水质均满足《城镇污水处理厂污染物排放标准》一级A标准.结果表明,长厌氧时间运行能实现快速颗粒化,但长期运行时颗粒易解体.较长的厌氧时间能减轻硝氮对PAO释磷的抑制,有助于富集DPAO,能获得良好的脱氮除磷效果.

To initiate the domestic sewage aerobic granular sludge(AGS)process,the experiment is operated by intermittent influent-effluent aeration to reduce the concentration of nitrate and the inhibition of PAO,and realize granulation by phosphate precipitation and positive electricity particles generated during phosphorus removal.The sludge from a sewage treatment plant is inoculated into the SBR reactors R1,R2,R3,and R4,for durations of 30,60,90,and 120 min total anaerobic time.This was used to study the effect of anaerobic time on the aerobic granular sludge system in domestic sewage.The experiment shows that reactors R1,R2,R3,and R4 are started successfully with 56,48,39,and 35 days,respectively.After 105 days of the operation,the respective average particle sizes reached 750,764,791,and 650μm.During the operational period,at the 43rd and 47th day,phosphorus removal performance deteriorated in R1 and R2,and it recovered after the anaerobic time was extended to 90 min.The effect of nitrogen and phosphorus removal in R3 is good;at the 63-77 day the granular sludge in R4 disintegrates,and the effect of nitrogen and phosphorus removal and DPAO enrichment is decreased.During the later stage of operation,the effluent in R1,R2,R3,and R4 reaches the IA standard of the discharge standard of pollutants for municipal wastewater treatment plant.The results show that a long anaerobic time can quickly achieve granulation,however the particles easily disintegrate during a long-term operation.Longer anaerobic time can reduce the inhibition of phosphorus accumulating organisms release phosphorus by nitrate,help enrich DPAO,and obtain a better nitrogen and phosphorus removal effect.