Garmerwolde污水处理厂提标改造--新增好氧颗粒污泥系统、旁侧流SHARON

Garmerwolde污水处理厂原主体工艺采用AB法。为应对不断增加的污水量和更加严格的排放标准,该厂进行了提标改造。2005年主要通过增加旁侧SHARON（2400 kgN/d）以解决污泥消化液处理问题,氨氮去除率95%以上,达到硝化阶段节约能耗25%、反硝化阶段节约外加碳源40%,减少50%的污泥产量。2013年新增独立运行的SBR好氧颗粒污泥系统（Nereda）,增加产能2.86万m3/d,好氧污泥颗粒化后60%颗粒〉1 mm、生物量可稳定达到8 g/L以上、SVI5值稳定在45 mL/g左右,出水TN≤7 mg/L,TP≤1 mg/L,比传统活性污泥系统能耗降低58%-63%、占地减少33%、运行费用节省50%。

Demystifying polyphosphate-accumulating organisms relevant to wastewater treatment: A review of their phylogeny, metabolism, and detection

Currently,the most cost-effective and efficient method for phosphorus(P)removal from wastewater is enhanced biological P removal(EPBR)via polyphosphate-accumulating organisms(PAOs).This study integrates a literature review with genomic analysis to uncover the phylogenetic and metabolic diversity of the relevant PAOs for wastewater treatment.The findings highlight significant differences in the metabolic capabilities of PAOs relevant to wastewater treatment.Notably,Candidatus Dechloromonas and Candidatus Accumulibacter can synthesize polyhydroxyalkanoates,possess specific enzymes for ATP production from polyphosphate,and have electrochemical transporters for acetate and C4-dicarboxylates.In contrast,Tetrasphaera,Candidatus Phosphoribacter,Knoellia,and Phycicoccus possess PolyP-glucokinase and electrochemical transporters for sugars/amino acids.Additionally,this review explores various detection methods for polyphosphate and PAOs in activated sludge wastewater treatment plants.Notably,FISH-Raman spectroscopy emerges as one of the most advanced detection techniques.Overall,this review provides critical insights into PAO research,underscoring the need for enhanced strategies in biological phosphorus removal.