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foam problem in wastewater pipe

foam problem in wastewater pipe

(OP)
The plant is having issue with foam building up in a vertical pipe that carries filtrate from the belt filter press. The filtrate is collected in an above the ground tank. The vertical pipe is partially filled with water all the time since it is discharging the filtrate to the aboveground tank. The foam building up inside the vertical pipe and coming out of the vent. Any idea how this foam can be diverted to nearby sewer or eliminate the foam without use of chemical?

RE: foam problem in wastewater pipe

Reduce the intensity of the mixer or pumping should lessen the foam. You probably can knock it down with a water spray.

An inert silicon based anti-foam would also take care of it.

RE: foam problem in wastewater pipe

(OP)
The flow is gravity flow, flow coming out of the belt filter. As such pumping and/or mixer is not involved. Adding chemical is not desired, since foaming is a continuous process when filter press is in operation. Water Spray is a good idea but the foaming issue is inside the pipe.

RE: foam problem in wastewater pipe

Thought your were pumping it from the drain to the tank.

One thing that you can do is to extend the drop pipe inside the tank to below water level. It will stop the splashing and foaming inside of the tank.

RE: foam problem in wastewater pipe

I'm glad I found this thread. I'm got some valuable info. One of my case studies involves this, and I've been looking OUTSIDE the pipe the entire time. Thanks!

I'm an engineering student hoping to get hired at a <a href="http://www.sigmathermal.com">Process Heating</a> company.

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