Moses

Dear Enrico
I noticed that SST_1 was not working at the first stage, I decided to delete and drag new SST so that it was recorded as SST_2.
Thanks
Moses

It's now working well, I think the problem was secondary clarifier was name as SST_1 while I was using SST_2. Once I changed it all the results came out well.

[i]have another issue now - will create a separate thread for it[/i]

Regards
Moses

Dear Enrico
Its true that the flow splitter is connected to the underflow of the secondary clarifier does not receive any input from secondary clarifier. It's true that the bottom layer of the clarifier shows zero concentration. I'm using ASM2dModTemp.
For secondary clarifier key parameters

X_In=7.963 g/m3
X_Out=29.516 g/m3
X_Under=0 g/m3

Q_In=285702.5 m3/d
Q_Out=285702.5 m3/d
Q_Under_Actual=0 m3/d

Q_Under is variable (i.e. connected to the input file), Area=7200 m2 and Height=6.1 m

For flow splitter there is only values for Q_Out2 which are variable (i.e connected to the input file for waste sludge.)
Regards
Moses

I have got an issue after simulating the model.I'm using secondary clarifier Takacs_SVI, I got X_under and Q_under _Actual values are 0 g/m3 while there is concentration value of X_in and X_Out also Q_in = Q_out and X_layer 6 up to 10 has zero value in secondary settler. Q_under in the secondary settler is connected with input file of under flow with consistent unit (m3/d) but all variables in the connected flow spliter with secondary settler is zero after simulation. The flow spliter is connected with expected waste sludge flow input file. What might be the problem? Other flow spliter in the model has variable values.
Regards
Moses

Dear Enrico
I would like to know more from your previous explanation, Y_Min >measured value (Y_M) then you allow bypass (u_on=1) and when Y_Max <measured value (Y_M) then you don't allow bypass (u_off=0). In my opinion, I'm thinking that the aim of bypass is to bypass the exceeded flow. I was expecting to bypass when Y_M>Y_Max. Did I understand it right or not? If i'm wrong I would like to know more about another constant ratio controller in terms of how it work. I have already read Model guide for it.
Regards
Moses

Dear Enrico
Thanks
Regards
Moses

Dear Enrico
I'm using OnOff controller, I want the flow above 113,000 m3/d must be bypassed.According to what you directed me, I should change it.
Thanks
Moses

I want to fractionate TKN by using ASM2d but by default the model connect direct TKN to S_NH. Can I use ASMG2d instead of ASM2d because there is a deduction of Org_N from S_NH sometimes (IF (state.Org_N <=0) THEN 0 ELSE -1). Is there a significant difference between ASMG2d and ASM2d?
Thanks
Regards
Moses

I have set a bypass and I would like to get  a clarification to improve my confidence. The incoming flow is in m3/d, I'm assuming that y_Max and y_Min should be in m3/d as well. Is that right? I have set y_Max =113,000 and y_Min=10000, u_Off=0 and u_On=1. How will i know that bypass is working as I describe.
Regards
Moses

Dear Enrico
It is NOT stable negative concentration, I'm simulating for 735 days, it happened few days in day 211 and day 411. The end results are positive but message log details was just alerting.
Thanks
Moses