Activated Sludge System Simulation Programs
Code wrote in TurboPascal 4 in the late 1980s and early 1990s.
Nitrification and Nitrification/Denitrification Systems
by P L Dold, M C Wentzel, A E Billing, G A Ekama and G v R Marais, year 1991.
Water Research Group Department of Civil and Chemical Engineering University of Cape Town Rondebosch 7700 Republic of South Africa
Current status (August 2019)
It could be compiled using the compiler Free Pascal (fpc) (https://www.freepascal.org/). This means that executable files can be generated for different operating systems.
Compilation attempts
2019-08-26: unsuccessful (tried with FPC compiler under Linux Debian OS, see Issues).
A discussion was opened on August 2019 on this forum thread to attempt a compilation with help of free pascal community
https://forum.lazarus.freepascal.org/index.php/topic,46538.0.html
Note
conversion of original .did files to .csv can be done in python using this script: https://github.com/holalluis/retrieve