摘要
新疆番茄酱生产过程中产生的废水具有浓度高、处理难度大、易污染地表水等特点,研究降解该废水处理技术具有重要意义。在室温下接种絮体污泥于间歇式活性污泥反应器(SBR)R1和R2中,以人工配制番茄酱废水为进水基质,采用阶梯式进水COD浓度方式培养好氧颗粒污泥(AGS),探究进水COD浓度变化对AGS形态、污泥理化特性及除污效能的影响。结果表明:梯度进水COD浓度固定为350 mg/L,R1和R2中污泥完全颗粒化后,颗粒粒径分别为780μm和1060μm;R1、R2对番茄酱废水中COD、NH_(3)-N、TN和PO_(4)^(3-)-P平均去除率分别为95.2%、96.03%、85%、92.07%和93%、89.54%、78%、89%。进水COD浓度为346~750、750~900、900~1200 mg/L时,颗粒形态由丝状菌骨架、孔洞结构和块状聚集体构成。氨氧化菌(AOB)和硝化菌(NOB)主要存在于小粒径AGS的外层和次外层,聚磷菌(PAOs)和聚糖菌(GAOs)主要存在于反应器底部的大颗粒污泥中。在梯度进水COD浓度不变下,高浓度的进水COD有助于AGS的快速形成及富集脱氮除磷的微生物菌群,提高了系统脱氮除磷的性能。
The wastewater generated from tomato sauce processing in Xinjiang exhibits high concentration,challenging treatment,and potential for surface water pollution.Therefore,studying the degradation technology for tomato sauce wastewater treatment is of significant importance.In this study,floc sludge was inoculated into two sequencing batch reactors(SBR),R1 and R2,at room temperature.Artificially prepared tomato sauce wastewater was used as the influent substrate to cultivate aerobic granular sludge(AGS)under varying influent chemical oxygen demand(COD)concentrations.The aim was to investigate the effects of influent COD concentration on AGS morphology,physicochemical characteristics of the sludge,and pollutant removal efficiency.The results demonstrate that with a fixed COD concentration of 350 mg/L in the gradient influent,the particle diameters of the sludge in R1 and R2 after complete granulation were measured as 780μm and 1060μm,respectively.The average removal rates of COD,NH 3-N,TN,and PO_(4)^(3-)-P in the tomato sauce wastewater were as follows:R1(95.2%,96.03%,85%,92.07%)and R2(93%,89.54%,78%,89%).For influent COD concentrations ranging from 346 to 750 mg/L,750 to 900 mg/L,and 900 to 1200 mg/L,the granular morphology consisted of filamentous bacterial skeletons,porous structures,and agglomerates.Ammonia-oxidizing bacteria(AOB)and nitrite-oxidizing bacteria(NOB)predominantly existed in the outer and subouter layers of small-sized AGS particles,while polyphosphate-accumulating organisms(PAOs)and glycogen-accumulating organisms(GAOs)were mainly found in larger particles at the bottom of the reactor.Under constant gradient influent COD concentration,a high influent COD concentration contributed to the rapid formation of AGS and the enrichment of microbial communities responsible for nitrogen and phosphorus removal,consequently enhancing the system’s nitrogen and phosphorus removal performance.
作者
肖飞
王维红
XIAO Fei;WANG Wei-hong(College of Water Conservancy and Civil Engineering,Xinjiang Agricultural University,Urumqi 830052,China)
出处
《长江科学院院报》
CSCD
北大核心
2023年第6期55-63,70,共10页
Journal of Changjiang River Scientific Research Institute
基金
国家自然科学基金项目(51968071)。
关键词
好氧颗粒污泥(AGS)
梯度进水
除污性能
SBR反应器
番茄酱废水
aerobic granular sludge
gradient inflow
decontamination performance
sequencing batch reactor
tomato sauce processing wastewater