Anammox-zeolite system acting as buffer to achieve stable effluent nitrogen values
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- 作者：Kozet Yapsakli ; Cigdem Kalkan Aktan ; Bulent Mertoglu
- 关键词：Anammox ; Biodegradation ; Zeolite ; Ion ; exchange ; Ammonium removal
- 刊名：Biodegradation
- 出版年：2017
- 出版时间：February 2017
- 年：2017
- 卷：28
- 期：1
- 页码：69-79
- 全文大小：
- 刊物类别：Earth and Environmental Science
- 刊物主题：Microbiology; Soil Science & Conservation; Geochemistry; Terrestrial Pollution; Waste Water Technology / Water Pollution Control / Water Management / Aquatic Pollution; Waste Management/Waste Technolo
- 出版者：Springer Netherlands
- ISSN：1572-9729
- 卷排序：28
文摘
For a successful nitrogen removal, Anammox process needs to be established in line with a stable partial nitritation pretreatment unit since wastewater influent is mostly unsuitable for direct treatment by Anammox. Partial nitritation is, however, a critical bottleneck for the nitrogen removal since it is often difficult to maintain the right proportions of NO2-N and NH4-N during long periods of time for Anammox process. This study investigated the potential of Anammox-zeolite biofilter to buffer inequalities in nitrite and ammonium nitrogen in the influent feed. Anammox-zeolite biofilter combines the ion-exchange property of zeolite with the biological removal by Anammox process. Continuous-flow biofilter was operated for 570 days to test the response of Anammox-zeolite system for irregular ammonium and nitrite nitrogen entries. The reactor demonstrated stable and high nitrogen removal efficiencies (approximately 95 %) even when the influent NO2-N to NH4-N ratios were far from the stoichiometric ratio for Anammox reaction (i.e. NO2-N to NH4-N ranging from 0 to infinity). This is achieved by the sorption of surplus NH4-N by zeolite particles in case ammonium rich influent came in excess with respect to Anammox stoichiometry. Similarly, when ammonium-poor influent is fed to the reactor, ammonium desorption took place due to shifts in ion-exchange equilibrium and deficient amount were supplied by previously sorbed NH4-N. Here, zeolite acted as a preserving reservoir of ammonium where both sorption and desorption took place when needed and this caused the Anammox-zeolite system to act as a buffer system to generate a stable effluent.