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不同生物营养物处理工艺剩余污泥中温水解特性

Keywords: BNR工艺,剩余污泥,中温水解,胞外聚合物,污泥特性

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Abstract:

为了解不同生物营养物处理(BNR)工艺剩余污泥性质差异及其中温水解特性,采用序批式实验研究了来源于Orbal氧化沟(OD)和倒置A2/O工艺剩余污泥在中温水解过程中污泥浓度、营养物释放、污泥粒径、污泥絮凝性、污泥比阻及污泥胞外聚合物(EPS)的历时变化。结果表明,相同泥龄(约18d)条件下,OrbalOD剩余污泥氮含量较高,倒置A2/O剩余污泥磷含量较高,两者VSS/SS均低于0.6,导致中温水解过程污泥减量空间有限、氮磷释放速率不同。此外,尽管倒置A2/O工艺剩余污泥絮体尺寸及絮凝能力明显大于OrbalOD工艺剩余污泥的对应值,但两污泥比阻相近。中温水解过程中,两污泥絮体的尺寸均变小、絮凝能力均降低、比阻均增高;两者的胞外聚合物均呈现增高再降低趋势,且蛋白质均占EPS质量的75%以上,为主要的胞外物质。

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