• ASM1_AN (Anammox)

    Hi Enrico,

    I have tried for the first time to work with the ASM1_AN. However when I try to open a new project with this specific model appears an error message saying “Loading layout fail. Logging for details”, and WEST close by itself the project, being impossible to check the logging window.
    If I open a new ASM1 blank project, and in the SETUP I change the model from ASM1 to ASM1_AN, the message that appears says “The block library is not compatible with the layout: Select another Block library or Instance. See logging for the details”

    I attach a capture of the logging window.

    Maybe I have to make something before opening the ASM1_AN model….I do not know.

    Thanks for your attention.

  • Re: How to simulate an UASB

    Hi Enrico,

    3 years has passed since the last comment in this topic about how to simulate in WEST a UASB reactor. And I wonder if there has been progress in this aspect.

    In WEST 2017, is there a more o lees accurate way to simulate this UASB reactor, with the available blocks in the library?

    What about the option to use the anaerobic digestor block in the line water + secondary point settler + underflow rate from the point settler, as recirculation, to the UASB.?  It is the only one that I can imagine without developing a specific model for a UASB….

  • Re: Thermophilic operation

    Thanks Enrico.
  • Thermophilic operation


    I would like to ask if the digestion model is able to simulate a thermophilic operation condition, or if above 42ºC, the model is not able to reproduce the real behavior.

    Thanks for your time.

  • Automation of a bypass

    I am trying to implement in my model a condition that could let me to automate an specific bypass of a % of the influent flow to the primary decanter depending on the value of the DQO/NTK relationship. For example, two orders that I want to create are that when DQO\NTK= 6, then the 0% of the influent flow bypasses the primary decanter, but when DQO\NTK= 8, then the 25% of the influent flow bypasses the primary decanter.

    As a first step, I am able to create the new variable "DQO\NTK in the influent" with the calculator tool, but I am not sure about what other blocks I should use in order to create this kind of automation that I would like to implement. I do not see a direct application to this aim with the typical blocks of control like "timers" and "PI", etc....

    Thanks for your help and time.
  • Re: MBR block

    Hi Enrico,

    You are absolutely right and now it runs perfectly. Indeed I tried, before your last advice, changing the “initial mass of water”, but I pressed the button of “play” in Dinamic State, and not in Steady State.

    Thanks a lot for your useful explanations.
  • Re: MBR block

    Hi again Enrico, and first of all thanks for your explanations.

    Asking your last questions,  all represented parameters are in the left vertical axe, except the volume, which is in the right vertical axe. The negative value appears when the volume decreases until the value of 50 m3 (in that simulation, corresponds at the same time with the “V_tank” and “V_min”).

    Unfortunately, following your instructions, after decreasing the value of the “V_min” to 40 or even 10 m3, the situation that I find is more or less the same, despite I have proved with different integrators models and diminished the “tolerance” in order to go slower but safer.

    The only integrator model that does not show negative values in the plot of flows and volume is “VODE”, but in return, the quality of the effluent fluctuates without sense (see the attached images, with V_min=10 m3 and VODE integrator)…something happens with the integrator I am afraid.. Any more advice, please?

    Thanks a lot for your dedication.
  • MBR block


    I would be really pleased if you could help me a little with a MBR system that I am not able to make work properly.

    Basically the main problem is with the flow balance. The value of the “influent  flow rate” is equal  to the value of “Q_Out_membrane” as a result of the estimation of the value of the flux as “Q_in/Surface membrane area” and considering the relaxation time.

    Q_In= 113,00 m3/d
    Q_Out= 112,97 m3/d
    Q_Out_Membrane= 112,97 m3/d
    Q_Concentrate = 100,00 m3/d
    J1= 0,4035 m/d
    Q waste= 10 m3/d
    Q recirculation = 90 m3/d
    Membrane Surface area: 280 m2
    Volume of the tank: 50 m3
    Volume minimum: 50 m3
    T1 (relaxation period)=0,11666667 min
    T2 (filtration period)=7,4999995 min

    When simulating, the initial volume of the MBR decreases, and when it arrives to 50 m3 (the desired one), the simulation shows strange values and stop (please, see the attached image). With this information, could you have any idea of where is my mistake?

    I have tried to synthetize the main information in order you can find a solution, but sometimes is more difficult to explain it than showing it in the project.

    Thanks a lot for your time.
  • Re: Trickling filter

    That´s right Enrico. The doubt was very simple, but I preferred to be sure, before to incorporate a secondary clarifier in a specific technology where there is not.

    Thanks again, as always, for your kind and effective support.
  • Trickling filter


    I will try to ask you a simple question. I am starting to create the model of a Biostyr of Veolia, and the Trickling filter I think that is the appropriate one. Despite this system, in real life, has not secondary decanter, I am afraid that West needs to incorporate a secondary clarifier in order to simulate the quality of the effluent, and to estimate the flow of sludge to drain. Do you consider that this approach is correct to start? I know that this means to simplify some aspects (I do not consider the different steps to wash the filter, and the return of dirty water to the beginning of the WWTP), but I do not need to complicate a lot the model.

    Thanks a lot for your time.