A systematic study of ammonia recovery from anaerobic digestate using membrane-based separation

Producción CientíficaAmmonia recovery from synthetic and real anaerobic digestates was accomplished using hydrophobic flat sheet membranes operated with H2SO4 solutions to convert ammonia into ammonium sulphate. The influence of the membrane material, flow rate (0.007, 0.015, 0.030 and 0.045 m3 h−1) and pH (7.6, 8.9, 10 and 11) of the digestate on ammonia recovery was investigated. The process was carried out with a flat sheet configuration at a temperature of 35 °C and with a 1 M, or 0.005 M, H2SO4 solution on the other side of the membrane. Polytetrafluoroethylene membranes with a nominal pore radius of 0.22 µm provided ammonia recoveries from synthetic and real digestates of 84.6% ± 1.0% and 71.6% ± 0.3%, respectively, for a membrane area of 8.6 × 10−4 m2 and a reservoir volume of 0.5 L, in 3.5 h with a 1 M H2SO4 solution and a recirculation flow on the feed side of the membrane of 0.030 m3 h−1. NH3 recovery followed first order kinetics and was faster at higher pHs of the H2SO4 solution and recirculation flow rate on the membrane feed side. Fouling resulted in changes in membrane surface morphology and pore size, which were confirmed by Atomic Force Microscopy and Air Displacement Porometry.Junta de Castilla y León - FEDER (VA088G19, CLU 2017-09 y UIC 071)Ministerio de Ciencia e Innovación (proyecto: PID2019-109403RB-C21/AEI/10.13039/501100011033

Side-stream membrane-based NH3 extraction to improve the anaerobic digestion of poultry manure

Producción CientíficaThe influence of membrane-based ammonia extraction on poultry manure (PM) wastewater treatment was assessed in a 3 L continuous stirred tank reactor (CSTR). The anaerobic digester operated for 91 days at a hydraulic retention time of 15 days and 37 °C. The flat sheet polytetrafluoroethylene (PTFE) membrane module was interconnected to the CSTR and operated at a recirculation flow rate of 0.25 L min−1. The membrane-based ammonia extraction mediated a decrease of total ammonia nitrogen of 64.5 % and of total nitrogen of 53.4 %, which induced an increase in the methane yields from 360 ± 70 up to 574 ± 5 N mL CH4 g VS fed−1. Similarly, chemical oxygen demand (COD) and volatile solids (VS) removal efficiencies increased from 59 % ± 2 % and 57 % ± 3 % up to 79.1 % ± 0.8 % and 65.8 % ± 0.2 %, respectively. This work targeted the enhancement of the performance of full-scale anaerobic digestion plants via reduction of NH3 concentration with a membrane-based extraction unit.Junta de Castilla y León - FEDER (VA088G19, CL-EI-2021-07, UIC 315 y UIC 082)Ministerio de Ciencia e Innovación - AEI (PID2019-109403RB-C21

Influence of pH on the performance of anaerobic piggery wastewater treatment coupled with membrane-based NH3 extraction

Producción CientíficaThe influence of the pH of piggery wastewater (PWW) on both ammonia recovery and anaerobic digestion performance during PWW treatment was evaluated in a continuous stirred tank reactor coupled with a membrane-based extraction module. The anaerobic digester was operated at a hydraulic retention time of 20 days at 37 °C, while the flat sheet PTFE membrane module operated continuously at liquid recirculation rates of 250 mL min−1. The membrane module was able to gradually decrease the total ammoniacal concentration from 1.27 ± 0.01 to 0.62 ± 0.01 g L−1 after 360 days of operation. Membrane-based NH3 extraction induced a CH4 yield increase of 1.3-fold. Moreover, COD and VS removal efficiencies increased up to 1.2-fold and 1.5-fold, respectively, along with the increase in PWW pH from 7.5 to 12. Total VFAs removal efficiencies were higher at a PWW pH of 9.Junta de Castilla y León - FEDER (VA088G19, CLU 2017-09, CL-EI-2021-07, UIC 315 y UIC 082)Ministerio de Ciencia e Innovación de España (PID2019- 109403RB-C21/AEI/10.13039/501100011033)Comisión Nacional de Investigación Científica y Tecnológica, Gobierno de Chile (PFCHA/DOCTORADO BECAS CHILE/2017 – 72180211

Wasterwater Preteatment with membranes . Pretatamiento de agua residual urbana mediante filtración con membranas

Direct membrane filtration of municipal wastewater from the city of Valladolid, Spain using an ultrafiltration membrane was investigated to concentrate the particulate organic matter. This is a physical process at 13-15 ºC that can be used as pretreatment for wastewater. This pretreatment together with an anaerobic process at low temperature could replace the active sludge process. In the new scheme proposed the permeated from the membrane would go to a posterior anaerobic treatment (UASB reactor operating under psychrophilic conditions) and the accumulated solids would be treated by an anaerobic digestion at 35ºC (mesophilic). The aim of this study was to evaluate the membrane filtration conditions. On the lower region of the membrane module results of TCOD 81.842gO2/L, 45.18gTS/L and 38.03gVS/L were reached. The permeate flux was 13.44 L/m2h with a filtration cycle of 7.75min (backwash time (15s), relaxation (5s), filtration (7.5min.) and a pausing time (5s), and a velocity of the gas 54.57m/h. The range for filtration TMP was 471 to 709.33 mbar. The average removal rate for TSS and VSS was 96.26% and 96.20% respectively and the specific methane production of the accumulated VS was 246.37 mLCh4/gSVfed and the TCOD average removal rate was 46.10%. Keywords: Direct Membrane Filtration, Recovery of Organic Matter, Municipal Wastewater, Accumulated Solids, and Anaerobic digestion 35 ºC. Filtración directa con membranas de agua residual urbanaa de Valladolid, España mediante ultrafiltración para concentrar la mateia orgánica particulada. Es un proceso físico entre 13-15 º C que puede ser utilizado como un pretratamiento de agua residual. Este pretratamiento junto con un proceso anaróbico a baja temperatura podría reemplazar el proceso convencional de fangos activos. En el esquema propuesto, el permeado de la membrana se trataría bajo una digestión anaeróbia a 35ºC (mesofílica)Departamento de Ingeniería Química y Tecnología del Medio AmbienteMáster en Ingeniería Ambienta

Enhancement of swine manure anaerobic digestion using membrane-based NH3 extraction

Producción CientíficaThe influence of suspended solids and pH in anaerobically digested piggery wastewater on membrane-based NH3 extraction was evaluated in batch tests. The increase in pH in the anaerobic broth from 8 to 9 resulted in an increase in NH3 removal efficiencies from 15.8 % ± 0.1 % to 20.9 % ± 0.4 % regardless of the suspended solids. The influence of membrane based NH3 extraction on piggery wastewater treatment was also assessed in a CSTR interconnected with PTFE membrane modules. The decrease in TKN concentrations mediated by membrane operation induced an increase in CH4 yield from 380.4 ± 84.9 up to 566.1 ± 7.8 NmLCH4 g VS fed−1. Likewise, COD and VS removal efficiencies significantly increased from 33.0 % ± 2.0 % and 25.7 % ± 2.3 % up to 61.8 % ± 1.3 % and 37.9 % ± 1.8 %, respectively. Interestingly, the decrease in NH3 concentration entailed a complete assimilation of VFA.Junta de Castilla y Leon - Fondo Europeo de Desarrollo Regional (grants VA088G19, CL-EI-2021-07, UIC 315 and UIC 082)Ministerio de Ciencia, Innovación y Universidades (grant PID2019-109403RB-C21/AEI/10.13039/501100011033

VIII Semana de la Facultad de Educación : Desafíos de las pedagogías, las prácticas y las perspectivas investigativas en el siglo XXI.

Estas memorias de la viii Semana de la Educación Desafíos de las pedagogías, las prácticas y las perspectivas investigativas en el siglo XXI, publicadas por la editorial de la Corporación Universitaria Minuto de Dios (uniminuto), contienen las ponencias, los talleres y los foros sobre las tendencias actuales de la pedagogía, las prácticas y la investigación que desarrollan los maestros y estudiantes de licenciaturas en las instituciones educativas a nivel preescolar, básica, media y superior. Son ponencias con carácter innovador e incluyente, que responden a los retos actuales de la sociedad y que conducen a la mejora de las condiciones de formación de los ciudadanos que requiere el país, dadas las particularidades de pluralismo propias de nuestras regiones. Durante el encuentro, también se compartieron experiencias artísticas, culturales y deportivas

VIII Semana de la Facultad de Educación : Desafíos de las pedagogías, las prácticas y las perspectivas investigativas en el siglo XXI.

Estas memorias de la viii Semana de la Educación Desafíos de las pedagogías, las prácticas y las perspectivas investigativas en el siglo XXI, publicadas por la editorial de la Corporación Universitaria Minuto de Dios (uniminuto), contienen las ponencias, los talleres y los foros sobre las tendencias actuales de la pedagogía, las prácticas y la investigación que desarrollan los maestros y estudiantes de licenciaturas en las instituciones educativas a nivel preescolar, básica, media y superior. Son ponencias con carácter innovador e incluyente, que responden a los retos actuales de la sociedad y que conducen a la mejora de las condiciones de formación de los ciudadanos que requiere el país, dadas las particularidades de pluralismo propias de nuestras regiones. Durante el encuentro, también se compartieron experiencias artísticas, culturales y deportivas