Control parameters in three-stage deammonification process for a mature leachate treatment based on a traditional Modified Ludzack-Ettinger process. (August 2022)

• Record Type: Journal Article
• Authors: Choi, Daehee; Shin, Hojin; Jung, Jinyoung
• Is Part Of: Journal of water process engineering. Volume 48(2022)
• Publication Date: 2022-08
• Subjects: MLE Modified Ludzack-Ettinger -- PN partial nitritation -- ANAMMOX anaerobic ammonium oxidation -- DN denitritation -- AOB ammonia oxidizing bacteria -- NOB nitrite oxidizing bacteria -- IR internal recycle -- ER external recycle -- ROM refractory organic matter -- COD chemical oxygen demand -- BOD biochemical oxygen demand -- TN total nitrogen -- SS suspended solid -- DO dissolved oxygen -- FA free ammonia -- FNA free nitrous acid -- HRT hydraulic retention time -- NRE nitrogen removal efficiency -- NRR nitrogen removal rate -- NLR nitrogen loading rate -- ACE ammonium conversion efficiency -- SAA specific ANAMMOX activity; -- SBR sequencing batch reactor; Deammonification -- Mature leachate -- Refractory organic matter (ROM) -- Inhibition -- Internal recycle; Water-supply engineering -- Periodicals; Saline water conversion -- Periodicals; Seawater -- Distillation -- Periodicals; Sanitary engineering -- Periodicals; Sewage -- Purification -- Periodicals; 627
• DOI: 10.1016/j.jwpe.2022.102863
• Languages: English
• ISSNs: 2214-7144

Abstract

Abstract: This study evaluated a three-stage deammonification process consisting of a sequentially Modified Ludzack-Ettinger (denitritation (DN) and partial nitritation (PN)) and anaerobic ammonium oxidation (ANAMMOX) for the treatment of mature leachate. In the initial stage, the nitrogen removal performance by two-stage deammonification was evaluated without an internal recycle (IR). The results showed that the ANAMMOX activity was severely inhibited from 0.19 to 0.03 gN/gVSS/d despite the stable partial nitritation. As inhibitors of ANAMMOX activity, the toxic effects of Refractory organic matter (ROM) and nitrite were found to deteriorate the stability of the process, and in particular, the ROM severely inhibited the activity. A three-stage deammonification process with the IR was implemented to alleviate the inhibition effects. As the IR was increased from 0 to 2Q, the ROM and nitrogen loads decreased by 35.3% and 27.8%, respectively. In addition, improved DN efficiency with external carbon sources allowed the ROM to serve as a potential electron donor for denitritation. With stabilization of ANAMMOX activity, the nitrogen removal performance rapidly stabilized. A nitrogen removal rate of 0.49 ± 0.02 kg/m 3 /d could be achieved with a nitrogen removal efficiency of 92.1 ± 2.1%. Graphical abstract: Unlabelled Image Highlights: A three-stage deammonification process for a leachate treatment plant was studied. An efficient strategy to retrofit the conventional process was proposed. Refractory organic in mature leachate inhibited ANAMMOX than the nitrogen loading. Internal recycle with external carbon improved the stability of the process.