Recent Posts

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WEST / Re: Modelling the (inhibitory) effect of salt on activated sludge processes
« Last post by FaPo on May 15, 2020, 03:26:14 pm »
Hi Hector,

A number of studies have evaluated and modelled the effect of salinity (particularly Cl-) on microbial activity in actiavted sludge.
The main findings are that salinity tends to be inhibitory above 0.5-1% levels, and that phosphorus uptake are nitrite oxidation are by far the most sensitive processes.
The effect of salinity is most commonly described as a non-competitive inhibition mechanism, which is mathematically described through a switching function that decreases the maximum growth rate, i.e.

mu_max * (K_I / (S_salt + K_I) * …                     where S_salt is the salinity level and K_I the inhibition coefficient

Here are some useful references:
Kargi, F., Dincer, A.R. (1996). Effect of salt concentration on biological treatment of saline wastewater by fed-batch operation.
Intrasunghka, N., Keller, J., Blackall, L. (1999). Biological nutrient removal efficiency in treatment of saline wastewater.
Panswad, T., Anan, C. (1999). Impact of high chloride wastewater on an anaerobic/anoxic/aerobic process with and without inoculation of chloride acclimated seeds.
Bassin, J.P., Pronk, M., Muyzer, G., Kleerebezem, R., Dezotti, M., van Loosdrecht, M.C.M. (2011). Effect of elevated salt concentrations on the aerobic granular sludge process: Linking microbial activity with microbial community structure.
General Topics / Re: Create *.dfsu file for new grid from old .dfsu file
« Last post by Sebastian on May 15, 2020, 08:28:06 am »
Hey Chris,

I'm not sure if i understand your question correctly.

But you could convert the .dfsu bed roughness file to a .dfs2 file and use this file as input for MIKE 21 FM (MIKE Zero -> File -> New -> File ... -> MIKE Zero --> Grid Series (.dfs3,.dfs2, ...) --> From dfsu File.

General Topics / Create *.dfsu file for new grid from old .dfsu file
« Last post by cflanary on May 14, 2020, 06:28:21 pm »

I'm trying to determine the best method for revising a .dfsu file for a revised mesh.  I have an original mesh with a .dfsu file representing bed roughness and I've made modifications to some elements and nodes within the mesh, reducing the number of elements, and I need to create a new bed roughness .dfsu file for the revised grid.

Any help you can provide would be very helpful.

Thank you,
MIKE FLOOD / Re: Fatal error: error in coupling with river links
« Last post by Sebastian on May 14, 2020, 02:35:42 pm »
It seems like you are trying to couple nodes/links from MIKE HYDRO with your MIKE21 FM Mesh, but some of those nodes/links are outside of the computational domain (= outside of the Mesh). You should only couple links, that are inside the mesh.
MIKE SHE / ERROR : UZ column shorter than the initial water depth
« Last post by ayla on May 14, 2020, 01:41:25 pm »
I wanted to solve this error by changing number 30 to 45 in the UZ section but I didn't see any change in the result.
What should I do to eliminate this error?
MIKE 11 / Warning of .sim11 file
« Last post by ayla on May 14, 2020, 01:22:05 pm »
Can anyone help me solve each of these warnings?
How can I change elevation in mike 11?
FEFLOW / Re: Invalid mesh topology
« Last post by DanielIosif on May 14, 2020, 09:12:02 am »
I managed to succeed by using Triangle along with points. There is need for setting small point target size with a small graduation not distort the straight lines representing the walls contour. The nodes can be furthermore connected with lines, for an easily find the center point.
MIKE SHE / Re: PreProcessing Error in MIKE SHE
« Last post by Dcaracciolo on May 12, 2020, 02:30:22 pm »
I found the error.
FEFLOW / Re: Invalid mesh topology
« Last post by DanielIosif on May 12, 2020, 10:54:17 am »
The main idea is that I need a certain distance between the node in all three directions. For example If I model a diaphragm wall having 6m length, 1.2m wide and 15m depth, I need to have nodes at 10cm from the edges, at 1m distance on one face and also at every meter in depth.

For example, in the image below, W - 1.2m, L - 6m, sp - 1m, c - 0.1m, D - 15m. I solve depth by defining slices, but what about the others?

Thank you!
FEFLOW / Re: Invalid mesh topology
« Last post by DanielIosif on May 12, 2020, 10:40:21 am »
This is the image.
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