Yohannis Mitiku student

I have a problem of ch4 overestimation in full scale digester. For small digester volume everything is fine, but for large digester volume, the total pressure increase and partial pressure of methane take the largest share (70-85%) of the total pressure hence the methane composition. How I could overcome this problem? 
thanks

Thanks Enrico. It is clear now.

Hi all,

What is a loop breaker? How it works? I couldn't find a document which explains it well.

regards,

Thanks,

The problem is solved.

Hi all,

I am working ADM1 modelling, I made some modification of flow splitter and combiner to my desire and faces a unit consistency problem i.e.  outflow concentration of the digester (AD) is in Kg/m3 and the splitter inflow is same value of AD outflow concentration in g/m3 which is wrong reading. I am looking to fix the problem, but not successful yet. Please guide me to fix this problem.

Kind regards,

Thanks Enrico. 

"the Components vector is not known to your new Instance".
How could I define the component vector in my Instance if it is not known?

Still I couldn't find the error: These  are components generated. Which one is undefined?

// AUTOMATICALLY GENERATED - DO NOT MODIFY

TYPE ADM1_onlyComponents "The components considered" =
ENUM
{
  H2O,
  S_INN,
  S_IC,
  S_ch4,
  S_h2,
  S_IC_liq,
  S_ch4_liq,
  S_h2_liq,
  S_aa,
  S_ac,
  S_bu,
  S_fa,
  S_Inert,
  S_pro,
  S_su,
  S_va,
  X_aa,
  X_ac,
  X_c,
  X_c4,
  X_ch,
  X_fa,
  X_h2,
  X_Inert,
  X_li,
  X_pr,
  X_pro,
  X_su,
  S_an,
  S_cat,
  G_CO2,
  G_H2,
  G_CH4
};

#define ADM1_onlyStandardCategoryModels
OBJ ADM1_onlyIndexOfSolvent "Index of the solvent in the component vector" : Integer := 1;
#define ADM1_onlySolublesPresent
OBJ ADM1_onlyIndexOfFirstSolubleComponent "Index of the first soluble component in the component vector" : Integer := 2;
OBJ ADM1_onlyIndexOfLastSolubleComponent "Index of the last soluble component in the component vector" : Integer := 16;
#define ADM1_onlyParticulatesPresent
OBJ ADM1_onlyIndexOfFirstParticulateComponent "Index of the first particulate component in the component vector" : Integer := 17;
OBJ ADM1_onlyIndexOfLastParticulateComponent "Index of the last particulate component in the component vector" : Integer := 28;
#define ADM1_onlyGasesPresent
OBJ ADM1_onlyIndexOfFirstGasComponent "Index of the first gas component in the component vector" : Integer := 31;
OBJ ADM1_onlyIndexOfLastGasComponent "Index of the last gas component in the component vector" : Integer := 33;
#define ADM1_onlyCalculateTSSComponent
OBJ ADM1_onlyIndexOfFirstTSSComponent "Index of the first TSS component in the component vector" : Integer := 17;
OBJ ADM1_onlyIndexOfLastTSSComponent "Index of the last TSS component in the component vector" : Integer := 28;

Hello!

I got the following error while I check for the new istance I am creating.  My catergory is ADM1 only.

Error System error: Undefined type name found : Components

Any one who can help?

Thanks

Thanks for your replay Enricho.

All other inhibition terms are close to 1. pH is 7.3.  I couldn't verify other factors which affet the acetate degradation except ammonia inhibition. Do you have any other suggestions?

thanks

Hi all,

I need your help /suggestion please respond.

In anaerobic digestion model ammonia inhibition as low as 12% (very bad). Soluble concentration of acetate in the effluent is very high when compare with others. I think the ammonia inhibits uptake of acetate and reduces the acetate degradation. How I overcome this problem? 

Thanks