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内循环对Orbal氧化沟系统生物脱氮除磷的影响

Keywords: 脱氮,反硝化除磷,氧化沟,内循环

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Abstract:

试验采用实际生活污水,利用改进的Orbal氧化沟中试系统(其中,氧化沟主体容积460L),在低溶解氧条件下研究了内循环对系统的影响,实现了良好的脱氮除磷效果.增加内循环回流比,可以增强系统对氨氮负荷的抗冲击能力,提高脱氮效果,但是除磷效率降低.考虑COD、氮和磷等指标,控制系统内循环回流比为1,可得到良好的处理效果.对系统进行物料平衡计算,结果表明,聚磷菌约吸磷0.18mgP/mgCOD,与文献值接近.试验发现,系统中存在着反硝化聚磷菌(DPAOs),其比吸磷速率为13.2mgP/(gVSS·h),根据缺氧与好氧比吸磷速率之比计算DPAOs约占总PAOs数量的23%.

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