Why don't you just summarize your day.
We were supposed
to start up a grit classifier. Grit classifiers remove grit and other solids before they can clog equipment downstream. Because of this they are always right at the headworks of a treatment plant.
So what you have is raw sewage along with all of the things people flush down toilets normally, plus the things that you shouldn't flush down the toilet but do anyway, plus all the other things that end up in sewers.
So this stuff is allowed to 'fall out into a cone shaped depression in the center of a circular tank. In the center of the tank is a four inch ductile iron pipe that hangs suspended maybe 4-5 inches off of the bottom of the tank. On the upper end is a pump that is designed to suck the grit and other debri off the bottom and pump it into a screw converyor. The water drains back into the tank and the screw moves the debri along and into a trash can.
The system we were starting today was shut off since August due to some bonheaded engineer that could not make a decision between solid state heater elements and bi-metallic elements for the new equipment.
The plant operators should have by-passed the tank...but they didn't. So all of the grit and debri from the past 3 months built up and clogged the bottom of that four inch line. We worked until 4:00 today trying to clear it.
Tomorrow we go at it again. The grease balls were horrific. The size of small children. When combined with the grit it was like the center of a bunker buster bomb.
The pictures describe it much better than I could.
The only good thing is this was in a very rural part of PA. Had it been in or near one of the cities we would have had the added joys of used hypodermic needles and other 'fun' stuff.
I'll provide a link and a few photos tomorrow.
Think about what you flush people!
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