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Fondo: <\/span><\/strong>El distrito del condado de Pima, AZ, opera un total de ocho plantas de tratamiento de aguas residuales. La Instalaci\u00f3n de Recuperaci\u00f3n de Agua de Tres R\u00edos (WRF) es la instalaci\u00f3n centralizada de procesamiento de bios\u00f3lidos para todas las plantas del Condado de Pima. Tres Rios WRF actualmente opera 24\/7\/365 a una capacidad de 30 MGD, con un flujo proyectado de 50 MGD en 2030. El proceso de la instalaci\u00f3n es; BNR, digesti\u00f3n anaer\u00f3bica, deshidrataci\u00f3n y aplicaci\u00f3n terrestre de bios\u00f3lidos. <\/span><\/span><\/p>\n La instalaci\u00f3n de Tres R\u00edos ha luchado contra la acumulaci\u00f3n de estruvita en tuber\u00edas y equipos despu\u00e9s de la digesti\u00f3n anaer\u00f3bica durante muchos a\u00f1os. Se utiliz\u00f3 una combinaci\u00f3n de adici\u00f3n de cloruro f\u00e9rrico en la corriente de proceso y agua de diluci\u00f3n en las l\u00edneas de retorno centralizado para retardar la acumulaci\u00f3n de estruvita. <\/span>En 2009, la instalaci\u00f3n comenz\u00f3 a recopilar datos para el tratamiento de la corriente lateral para precipitar la estruvita. Comenzando con el \u201cpanorama general\u201d, se consideraron todas las opciones posibles, desde recolectar estruvita de arroyos centrados hasta secuestrar estruvita dentro del digestato. Tambi\u00e9n se llev\u00f3 a cabo un estudio piloto in situ para determinar los niveles de rendimiento que se pod\u00edan esperar. En \u00faltima instancia, los objetivos del proyecto eran detener los problemas de incrustaciones de estruvita, eliminar la necesidad de agregar cloruro f\u00e9rrico y agua de diluci\u00f3n y reducir la carga de retorno de f\u00f3sforo a la planta.<\/span> Esto llev\u00f3 a que el proyecto avanzara para tratar el digestato y eliminar el f\u00f3sforo secuestrando la estruvita producida dentro de los bios\u00f3lidos.<\/span><\/span><\/p>\n \u00a0<\/span><\/p>\n El primer sistema NuReSys en Am\u00e9rica del Norte para la gesti\u00f3n de estruvitas: <\/span><\/strong>El proyecto se est\u00e1 entregando a trav\u00e9s de un m\u00e9todo de Gerente de Construcci\u00f3n en Riesgo (CMAR) a trav\u00e9s de un proceso de licitaci\u00f3n evaluado. Schwing Bioset, Inc. (SBI) fue seleccionado como proveedor del sistema en agosto de 2018. El objetivo principal es precipitar la estruvita dentro de la corriente de digestato para su eliminaci\u00f3n con los bios\u00f3lidos. Al convertir un m\u00ednimo de 85% del ortofosfato disponible en forma cristalina (o dejar no m\u00e1s de 50 ppm restantes en el efluente del reactor), la corriente de reciclado de f\u00f3sforo de regreso al cabezal de la planta se rompe. Adem\u00e1s, debido a la flexibilidad y el funcionamiento en dos etapas de la tecnolog\u00eda NuReSys, las demandas de energ\u00eda tambi\u00e9n pueden minimizarse, lo que resulta en ahorros anuales significativos. <\/span><\/p>\n El dise\u00f1o del sistema se finaliz\u00f3 mediante el contrato de dise\u00f1o de CMAR con HDR Engineering. Durante el proceso de dise\u00f1o, el condado de Pima, HDR y Schwing Bioset pudieron integrar varias caracter\u00edsticas importantes en este dise\u00f1o, el siguiente modelo detalla el concepto implementado: <\/span><\/p>\n Figura 1 - Modelo NuReSys del condado de Pima<\/em><\/p>\n Especificaciones del Sistema:<\/span><\/strong><\/p>\n Como se se\u00f1al\u00f3 anteriormente, el sistema NuReSys emplea un proceso \u00fanico de dos (2) pasos para precipitar la estruvita en un ambiente controlado y, opcionalmente, cosechar, ya sea en corrientes Digestate o Centrate. El primer paso es el ajuste del pH. En el CO2<\/sub> Release Tank el sistema libera CO2<\/sub> mediante aireaci\u00f3n de burbujas gruesas para elevar el pH a las condiciones \u00f3ptimas del proceso. El co2<\/sub> El tanque de liberaci\u00f3n tambi\u00e9n consumir\u00e1 la mayor parte del magnesio que queda en el digestato, produciendo fosfato de magnesio y amonio (tambi\u00e9n conocido como MAP o estruvita) antes de que la adici\u00f3n qu\u00edmica tenga lugar en el cristalizador. El segundo paso de cristalizaci\u00f3n dosifica MgCl2<\/sub> seg\u00fan sea necesario para completar las reacciones de estruvita.<\/span><\/p>\n El sistema del condado de Pima est\u00e1 configurado actualmente para tratar el flujo de digestato que sigue a los digestores anaer\u00f3bicos. La estruvita precipitada luego se incorpora a los bios\u00f3lidos y sale con la torta deshidratada. La Figura 2 a continuaci\u00f3n ilustra esta configuraci\u00f3n.<\/span><\/p>\n Figura 2 - Configuraci\u00f3n de digesti\u00f3n de NuReSys<\/em><\/p>\n <\/p>\n El sistema NuReSys en las instalaciones de Tres R\u00edos tiene dos caracter\u00edsticas de dise\u00f1o \u00fanicas que tanto el Distrito como la CMAR encontraron ventajosas durante el proceso de selecci\u00f3n:<\/span><\/p>\n Figura 3 - Configuraci\u00f3n h\u00edbrida de NuReSys<\/em><\/p>\n <\/p>\n A partir del oto\u00f1o de 2020, el sistema est\u00e1 en pleno funcionamiento en modo Digestate y completa las comprobaciones finales de puesta en marcha. M\u00e1s importante a\u00fan, el sistema cumple con los criterios de rendimiento especificados para PO4<\/sub>-P y Tres R\u00edos ha descontinuado su adici\u00f3n de Cloruro F\u00e9rrico, as\u00ed como las operaciones de agua de diluci\u00f3n. El sistema NuReSys tambi\u00e9n ha roto el circuito de retorno de f\u00f3sforo a la cabecera. Todo combinado, el sistema le ahorrar\u00e1 al Distrito cientos de miles de d\u00f3lares anualmente. Si bien existen numerosos sistemas NuReSys que operan en Europa, Schwing Bioset Inc. se enorgullece de nuestra primera instalaci\u00f3n de NuReSys que servir\u00e1 como buque insignia en Am\u00e9rica del Norte.<\/span><\/p>\n Figura 4 - Sistema NuReSys instalado en Tres Rios WRF<\/em><\/p>\n <\/p>\n haga clic aqu\u00ed<\/span><\/span><\/strong><\/a><\/span>\u00a0para leer m\u00e1s sobre nuestros productos, entonces\u00a0<\/span>Cont\u00e1ctenos<\/span><\/strong><\/a><\/span><\/span>\u00a0para obtener m\u00e1s informaci\u00f3n sobre este proyecto o descubrir c\u00f3mo podemos ayudar tambi\u00e9n a su planta.<\/span><\/p>\n \u00a0<\/span><\/p>\n Vea las historias anteriores del Proyecto del Condado de Pima de Josh aqu\u00ed: <\/span><\/p>\n Parte uno: <\/span><\/strong>Bombeo de pastel<\/em><\/a><\/span><\/p>\n La segunda parte:\u00a0<\/span><\/strong>Contenedores inferiores vivos<\/em><\/a><\/span><\/p>\n Parte tres:\u00a0<\/span><\/strong>Deshidrataci\u00f3n de prensa de tornillo m\u00f3vil<\/em><\/a><\/span><\/p>\n <\/p>\n [\/et_pb_text][\/et_pb_column][\/et_pb_row][\/et_pb_section]<\/p>","protected":false},"excerpt":{"rendered":" Written by Josh DiValentino Background: The district of Pima County, AZ, operates a total of eight wastewater treatment plants. The Tres Rios Water Reclamation Facility (WRF) is the centralized biosolids processing facility for all Pima County plants. Tres Rios WRF currently operates 24\/7\/365 at a 30 MGD capacity, with a projected flow of 50 MGD […]<\/p>","protected":false},"author":2,"featured_media":2886,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_et_pb_use_builder":"on","_et_pb_old_content":" \u00a0<\/p> <\/p> Written by Josh DiValentino<\/span><\/em><\/p> \u00a0<\/p> Background: <\/span><\/strong>The district of Pima County, AZ, operates a total of eight wastewater treatment plants. The Tres Rios Water Reclamation Facility (WRF) is the centralized biosolids processing facility for all Pima County plants. Tres Rios WRF currently operates 24\/7\/365 at a 30 MGD capacity, with a projected flow of 50 MGD in 2030. The facility process is; BNR, Anaerobic Digestion, Dewatering, and Land Application of biosolids. <\/span><\/span><\/p> The Tres Rios facility has battled struvite build-up in pipelines and equipment following anaerobic digestion for many years. A combination of Ferric Chloride addition in the process stream and dilution water in the centrate return lines was used to slow struvite build-up. <\/span>In 2009 the facility began to gather data for side stream treatment to precipitate struvite. Starting with the \u201cbig picture,\u201d all possible options were considered, from harvesting struvite from centrate streams to sequestering struvite within the digestate. An on-site pilot study was also conducted to determine levels of performance that could be expected. Ultimately the goals of the project were to stop struvite scaling issues, eliminate the need for Ferric chloride and dilution water addition, and reduce the phosphorus return loading to the plant.<\/span> This led to the project moving forward to treat digestate and remove phosphorus by sequestering the produced struvite within the biosolids.<\/span><\/span><\/p> \u00a0<\/span><\/p> The First NuReSys System in North America for Struvite Management: <\/span><\/strong>The project is being delivered through a Construction Manager At Risk (CMAR) method via an evaluated bid process. Schwing Bioset, Inc. (SBI) was selected as the system provider in August 2018. The primary objective is to precipitate struvite within the digestate stream for removal with the biosolids. By converting a minimum of 85% of the available orthophosphate into crystalline form (or leaving no more than 50 ppm remaining in reactor effluent), the phosphorus recycle stream back to the head of the plant is broken. Additionally, due to the flexibility and two stage operation of the NuReSys technology, power demands are also able to be minimized resulting in significant annual savings. <\/span><\/p> The design of the system was finalized through the CMAR design contract with HDR Engineering. During the design process Pima County, HDR, and Schwing Bioset were able to integrate several important features into this design, the following model details the implemented concept: <\/span><\/p> Figure 1 - Model Pima County NuReSys<\/em><\/p> \u00a0<\/p> System Specifications:<\/span><\/strong><\/p> As previously noted, the NuReSys system employs a unique two (2) step process to precipitate struvite in a controlled environment and optionally harvest, on either Digestate or Centrate streams. The first step is pH adjustment. In the CO2<\/sub> Release Tank the system releases CO2<\/sub> via coarse bubble aeration to raise the pH to optimum process conditions. The CO2<\/sub> Release Tank will also consume most of the magnesium remaining in the digestate, producing Magnesium Ammonium Phosphate (otherwise referred to as MAP, or struvite) prior to chemical addition taking place in the Crystallizer. The second crystallization step doses MgCl2<\/sub> as necessary to complete the struvite reactions.<\/span><\/p> The Pima County system is currently set up to treat digestate flow following the Anaerobic digesters. The precipitated struvite then becomes entrained in the Biosolids and goes out with dewatered cake. Figure 2 below illustrates this configuration.<\/span><\/p> Figure 2 - NuReSys Digestate Configuration<\/em><\/p> \u00a0<\/p> The NuReSys system at the Tres Rios facility has two unique design features that both the District and the CMAR found advantageous during the selection process:<\/span><\/p> Figure 3 - NuReSys Hybrid Configuration<\/em><\/p> \u00a0<\/p> As of Fall of 2020, the system is fully operational running in Digestate mode and completing final start-up checks. More importantly, the system is meeting the specified performance criteria for PO4<\/sub>-P removal and Tres Rios has discontinued its Ferric Chloride addition as well as dilution water operations. The NuReSys system has also broken the return phosphorus loop to the headworks. All combined, the system will save the District hundreds of thousands of dollars annually. While there are numerous NuReSys systems operating in Europe, Schwing Bioset Inc. is proud of our first NuReSys installation that will serve as the flagship in North America.<\/span><\/p> Figure 4 - Installed NuReSys System at Tres Rios WRF<\/em><\/p> \u00a0<\/p> Click here<\/span><\/span><\/strong><\/a><\/span>\u00a0to read more about our Products, then\u00a0<\/span>contact us<\/span><\/strong><\/a><\/span><\/span>\u00a0to learn more about this project or find out how we can help your plant too.<\/span><\/p> \u00a0<\/span><\/p> Check out Josh\u2019s previous Pima County Project stories here: <\/span><\/p> Part One: <\/span><\/strong>Cake Pumping<\/em><\/a><\/span><\/p> Part Two:\u00a0<\/span><\/strong>Live Bottom Bins<\/em><\/a><\/span><\/p>![\"NuReSys](\"https:\/\/f.hubspotusercontent30.net\/hubfs\/51084\/Rendering.png\")
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![\"Digestate](\"https:\/\/f.hubspotusercontent30.net\/hubfs\/51084\/Digestate%20Graphic%20for%20Tres%20Rios%20Blog.jpg\")
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