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化工学报  2015 

单级SBR厌氧/好氧/缺氧处理中期垃圾渗滤液深度脱氮

DOI: 10.11949/j.issn.0438-1157.20140830, PP. 746-752

Keywords: 垃圾渗滤液,SBR,聚糖菌,PHAs,糖原,同步硝化反硝化,后置反硝化

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Abstract:

为了考察单级SBR处理实际中期垃圾渗滤液深度脱氮的可行性,采用单级SBR在“厌氧/好氧/缺氧”(AOA)运行方式下处理实际中期垃圾渗滤液。试验发现,厌氧/好氧/缺氧交替运行下驯化的微生物能在厌氧段消耗胞内糖原,并将水中部分溶解性有机物以聚羟基脂肪酸酯(PHAs)形式储存;在好氧段微生物消耗胞内PHAs,转化为胞内糖原,氨氧化的同时也伴随着同步硝化反硝化脱氮;好氧段氨氧化结束后贮存的碳源(PHAs和糖原)能为后置缺氧反硝化提供碳源。经长期试验研究,进水COD、NH4+-N、TN浓度分别为6430~9372mg·L-1、1025.6~1327mg·L-1、1345.7~1853.9mg·L-1,出水COD、NH4+-N、TN浓度能达到525~943mg·L-1、1.2~4.2mg·L-1、18.9~38.9mg·L-1。在未投加外碳源的情况下,SBR法AOA运行方式下能够实现中期垃圾渗滤液的深度脱氮,出水TN<40mg·L-1。其中,好氧段(DO<1mg·L-1)通过同步硝化反硝化去除TN占总去除量的1/3左右;缺氧后置反硝化去除的TN占总去除量的2/3左右。

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