While the sludge is converted to ash that has nutrients, the metal content in it does limit its marketability. This is a particularly valuable approach when there is limited available land. Wastewater treatment sludge can be incinerated as a method of disposal using an incinerator. Hauling wet sludge to the landfill is also costly and uses a lot of energy. If we can find a way to place these nutrients back into the environment, it would be a great sustainable alternative and would also help avoid taking up room in a landfill. Much of these nutrients are non-renewable and require resources to produce more. 9 m) in the future would have a more immediate impact.Disposing of sludge in a landfill is safe and reliable, however, it does fall a bit short in that it disregards the nutrients and organic matter that the sludge has. Numerical modeling suggests that despite the strong tidal currents in the region, wave forcing is the dominant factor moving the sediment slowly toward shore, and placing sediment at just slightly shallower depths (e.g. Although the subsequent beach response was inconclusive, after one year the peak of the disposal mound had migrated ~100 m toward the shore, providing evidence that annual dredge disposal at this site could be beneficial over the long-term by at the very least providing: 1) additional wave dissipation during storms 2) compatible sediment to feed nearshore bars, 3) sediment cover on an exposed sewage outfall pipe, and 4) a viable alternative to the shoaling offshore disposal site. This trial run was an attempt to provide a buffer to a reach of coastline where wave attack during the winter months has had a severe impact on existing sewage infrastructure. Nearshore dredge disposal was performed during the summer of 2005 at Ocean Beach, San Francisco, CA, a high energy tidal and wave environment.
0 Comments
Leave a Reply. |
Details
AuthorWrite something about yourself. No need to be fancy, just an overview. ArchivesCategories |