WEF Discussions — Now on LinkedIn!

WEF is pleased to announce the creation of free LinkedIn groups associated with its technical discussion forum topics. Through these LinkedIn groups, members will be able to view and participate in discussions, as well as communicate with one another via direct messages. Share your experiences and knowledge, ask questions and respond to other discussions as frequently as you like!

You must have a LinkedIn profile to join a LinkedIn group; you can create your profile here. If you already have a LinkedIn profile, all you need to do is submit a request to join one or all of the following groups:

Water Environment Federation (Main) | Biosolids | Collection Systems | Nutrients | Stormwater 
Utility Management | Water Reuse | Water for Jobs | Watershed Management | Laboratory Practices 

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Trash(tampons, etc.) problem w/ land application
Posted: Thursday, March 17, 2011 10:45 AM
Joined: 3/17/2011
Posts: 3

I am a landowner that allows liquid biosolids to be applied to my land.  I have an ongoing concern with trash like tampons, condoms, plastic, etc. that are coming out with the biosolids. 


I've expressed my concerns with the company that applies, but they say that some of these things will get through the system and it is hard for them to get it all out.


What should be an "acceptable" level of this trash?


I would think with today's technology, they should be able to get out all the trash at the plants. 


The application company put in a homemade screening box which was made from a large roll-off box with a couple of walls of expanded metal "screens".  The problem is the holes are too large and the trash passes through them.  When I pointed that out, they said that any smaller holes will clog too quickly because of hair.


I've researched a screening system like a Muffin Monster, but the costs are extremely high.


Any suggestions would be greatly appreciated.



Posted: Wednesday, April 27, 2011 7:26 AM

Most likely the screening equipment at the head-end of the wastewater plant is not designed properly or is not being operated / maintained properly. At our plant, we have 6 mm mechanical screens and none of the stuff you mention gets past them. As screens get years on them, they pass material because seals wear and leak, teeth break off, etc. At this point, rehab is in order.  A muffin monster can work (it grinds the material into small pieces, doesn't screen it out). It should be the plant's responsibility to bring you trash-free sludge.

Posted: Monday, June 27, 2011 12:53 PM
Kudos to you! I hadn't toghuht of that!