Posted by dhermesc on May 03, 2023 at 08:20:22 from (12.149.56.202):
In Reply to: Re: Sewage sludge posted by paul on May 03, 2023 at 05:23:10:
Only a few older cities in the east coast (and a few on the west coast) use the same pipes for sewage as they do for rainwater. The water drainage from the streets does NOT flow through the sewage plants. This is done for basic sanitation reasons - raw sewage stinks - especially raw sewage from humans. Every open grate or storm drain in a street would be emitting sewage odor along with the flies and pests and the entire town/city would smell of raw sewage. But that isn't the case.
The only way most sewage treatment plants get overwhelmed is if the sediment basin and/or aeration basin get two much rainwater - that would take almost a foot of rain in most cases. Bypass mode doesn't happen in most states in the US - only in a few old cities where the system was originally set up that way and they refuse to spend the money to correct it. New York City is a prime example. What they do and what Tulsa do are two completely different methods of operation.
If you want a well known example - in Christmas Vacation Cousin Eddie drains his RV tank into the storm drain and Clark tells him that it's not a sewer drain - later the RV sewage creates methane and blows up. While a funny piece of fiction its actually somewhat accurate. Raw sewage does create methane - and it will accumulate if not properly ventilated or contained. Allowing an entire city to sit on top of a vast reservoir of methane isn't something I would want to consider.
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