کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
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588308 | 878559 | 2014 | 7 صفحه PDF | دانلود رایگان |
![عکس صفحه اول مقاله: Achieving stable partial nitritation using endpoint pH control in an SBR treating landfill leachate Achieving stable partial nitritation using endpoint pH control in an SBR treating landfill leachate](/preview/png/588308.png)
The feasibility of using endpoint pH control to achieve stable partial nitritation (PN) in an SBR for landfill leachate treatment was investigated. By imposing a fixed-time anoxia followed by variable-time aeration in an SBR cycle, successful partial nitritation was maintained for 182 days at a nitrogen loading rate of 0.30–0.89 kg/m3/day. The effluent NO2−-N/NH4+-N ratio and the effluent NO3−-N concentration were 1.30 ± 0.22 and 16 ± 9 mg/L, respectively. High free ammonia (FA) and low dissolved oxygen (DO) concentrations were inhibition factors of nitrate formation. The termination of aeration at a suitable endpoint pH was the key to achieve an effluent NO2−-N/NH4+-N ratio close to the stoichiometric value. This endpoint pH control strategy represents practical potentials in the engineered application of combined PN–ANAMMOX processes.
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► Endpoint pH control was reliable to achieve stable partial nitritation performance.
► An effluent NO2−-N/NH4+-N ratio close to 1.32 was achieved.
► High FA and low DO concentrations were the main causes for inhibition of nitrate formation.
► Nitrogen loss was observed in both the air-off and air-on phases, possibly due to denitrification.
Journal: Process Safety and Environmental Protection - Volume 92, Issue 3, May 2014, Pages 199–205