Municipal water produced in industrial production units

Question

Since the right capacity of an wastewater treatment fabricated package is estimated based on the number of people whose produced water is sent for treatment and the amount of wastewater produced by each person, I am wondering how much municipal wastewater is produced in a production plant (water desalination plant for instance ) per shift (12 hour shift for instance) per person?
It seems it is different from the household base. Thanks in advanced

Ian Pearson · Accepted Answer

Hi Reza, this is a wide open question as it touches on a number of aspects.  In the design of a WWTW we take into consideration household contributions which may vary greatly from low cost housing areas to middle and affluent housing (e.g. from about 500 l/hh/d for a low cost housing with up to 7 people per house to 1000 l/hh/d or more for affluent households.  On top of that we know that water use is not uniform throughout the day, so we estimate peak flows for morning and evening periods.  The peak factor depends on the attenuation capacity of the sewer network (and hence the size of the network and the number of households served).  Where peak factors are large at the wastewater treatment works, there may be an equalization basin contructed to facilitate a more uniform flow through the works. We also allow for infiltration into the sewer during wet periods (estimated at approximately 15%).  This is all for design purposes.  We also need to take into account petrol stations, shops, hotels, industries, offices, etc. etc. 
What is useful is to get some historical actual flow data if this is available, or if not available for the particular settlement, that from similar settlements in the region.

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