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固体缓释碳源处理低碳氮比污水的脱氮及机理

Keywords: 改性天然缓释碳源,低碳/氮比,机理,脱氮,效果

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Abstract:

通过投加PHB(聚-β-羟丁酸)和改性天然缓释碳源,在填料高度0.6m处的实验表明,投加PHB后反应体系保持着对NH3-N较好的去除效果,去除率为13.04%~94.56%(均值67.45%)。而投加改性天然缓释碳源后,出水NH3-N浓度高于原水;待改性天然缓释碳源完全消耗后,出水NH3-N浓度低于原水。投加改性天然缓释碳源比投加PHB对去除NO3--N和TN的效果更好,在投加改性天然缓释碳源33d左右内,系统保持着对NO3--N和TN很高的去除效果,去除率分别达到17.31%~97.37%(均值77.18%)和33.69%~88.16%(均值74.06%)。在实验参数的基础上,投加改性天然缓释碳源后,系统对高效脱氮的时间可维持33d左右,反应体系对TN的去除主要依赖于反硝化细菌的异化作用。

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