Gotta ask... Do they expect you to replace the main line all the way to the treatment facility, costing you hundreds of millions of dollars, and at least 8 years of planning, environmental impact studies, engineering and construction? NOPE. The caustics and microbials you will contribute do need to be neutralized prior to ejection, but running a stainless main line is absurd, and makes no sense. Whomever is giving you this info is not a professional, nor are they educated about our process and regulations. TTB specifically addresses wastewater handling as set forth by the EPA, and approval of such methods. There is more harm from dumping Drain-O into a sink, than there is from neutralized caustics from our CIP, or the minute amount of fragile yeast cells.
I've been a General Contractor for over 25 years, and heard some wild stories, dealt with over-engineering and many FDA regulations, (I used to build Cold Stone Creameries), and this is a new one for me!
It's better to do your homework on how you will be neutralizing your waste and explaining the science. If this is true, we all have a whole lot of infrastructure to replace, and no beer will be made for years...
Best of luck!