WEF Discussion Forums
Biosolids and Residuals
Trash(tampons, etc.) problem w/ land application
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.
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.