固体缓释碳源处理低碳氮比污水的脱氮及机理

Nitrogen removal and mechanism of low C/N wastewater processed by solid sustain-released carbon

通过投加PHB(聚-β-羟丁酸)和改性天然缓释碳源,在填料高度0.6 m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NO-3-N和TN的效果更好,在投加改性天然缓释碳源33 d左右内,系统保持着对NO-3-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33 d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。

By dosing poly-β-hdyroxybutyrate(PHB) and modified natural sustain-released carbon,the experiment of 0. 6 m filler height showed that the reaction system has maintained good removal effect for NH3-N dosing PHB,removal rate is 13. 04% ~ 94. 56%(average 67. 45%). NH3-N effluent concentration is higher than that of influent concentration after dosing modified natural sustain-released carbon. But NH3-N influent concentration is higher than NH3-N effluent concentration after modified natural sustain-released carbon is completely comsumed. The removal effect of NO-3-N and TN dosing modified natural sustain-released carbon is better than that of dosing PHB for approximately 33 days,the removal of NO-3-N and TN is 17. 31% ~ 97. 37%(average 77. 18%) and 33. 69% ~ 88. 16%(average 74. 06%),respectively. On the basis of the experiment parameters, the system can maintain better effect for about 33 days,the removal of TN is mainly dependent on denitrifying bacteria catabolism in the reaction system.