Effective dampening of temperature effects in an anammox reactor treating real mainstream wastewater
Juan Díaz, Xènia (Universitat Autònoma de Barcelona. Departament d'Enginyeria Química, Biològica i Ambiental)
Pérez Cañestro, Julio (Universitat Autònoma de Barcelona. Departament d'Enginyeria Química, Biològica i Ambiental)
Carrera, Julian (Universitat Autònoma de Barcelona. Departament d'Enginyeria Química, Biològica i Ambiental)

Data:	2021
Resum:	The aim of the present study was to evaluate the capability of an up-flow anammox sludge bed reactor (13 L) of dampening a 10 ◦C temperature drop at mainstream conditions while operating at constant nitrogen loading rates (0. 11 ± 0. 01 g N L− 1 d− 1). The up-flow anammox sludge bed reactor was fed with an aerobically pre-treated mainstream wastewater. The reactor temperature was controlled as to mimic a (realistic) summer-to-winter transition from 20 to 10 ◦C plus a three months period at 10 ◦C. During the 350 days of operation, the average nitrogen removal rate remained high (0. 10 ± 0. 01 g N L− 1 d− 1), indicating that the 10 ◦C drop did not affect the overall efficiency of the reactor. This can be explained as anammox activity differed among the different sludge bed sections. At 20 ◦C, anammox activity was mainly located at the bottom of the sludge bed. At 10 ◦C, the anammox activity decrease of the bottom sludge bed was compensated by an activity increase within the upper sludge bed sections. The contribution of heterotrophic denitrifying activity to the total nitrogen removal rate was assessed to be 3-to-5 times lower than that of anammox, even at 10 ◦C. Microbial community of 16S rRNA gene-targeted sequencing analyses resulted in the identification of an uncharacterized Planctomycetes in high numbers. This study demonstrated that the low temperatures should not be an obstacle for the feasibility of anammox bacteria in the main water line of an urban wastewater treatment plant.
Ajuts:	Agencia Estatal de Investigación CTQ2017-82404-R
Drets:	Aquest document està subjecte a una llicència d'ús Creative Commons. Es permet la reproducció total o parcial, la distribució, i la comunicació pública de l'obra, sempre que no sigui amb finalitats comercials, i sempre que es reconegui l'autoria de l'obra original. No es permet la creació d'obres derivades.
Llengua:	Anglès
Document:	Article ; recerca ; Versió acceptada per publicar
Matèria:	Mainstream anammox ; Urban wastewater ; Overcapacity ; Substrate concentration profiles
Publicat a:	Journal of Water Process Engineering, Vol. 40 (April 2021) , art. 101853, ISSN 2214-7144

DOI: 10.1016/j.jwpe.2020.101853

Postprint 56 p, 1.9 MB

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