Sludge recycling
Sludge recycling
(OP)
I am looking for a method to benifically recycle WWTP sludge. We currently produce about 1000 tons per annum and the material is non hazardous with about 70% water content with Iron being the next major constituent at about 10% and Calcium at about 3%.
I am looking for any methods to recycle the material as is and any methods that would require some process changes that would make the make the matterial more recyclable, such as drying or change to alumu instead of ferric.
Any suggestions?
I am looking for any methods to recycle the material as is and any methods that would require some process changes that would make the make the matterial more recyclable, such as drying or change to alumu instead of ferric.
Any suggestions?





RE: Sludge recycling
Russ Faust
Salem, OR
RE: Sludge recycling
It was the greenest field for miles around and of course, it had approvals from regulators.
KRS Services
www.krs-services.com
RE: Sludge recycling
Mike Bensema
www.dutchmenservices.com
RE: Sludge recycling
RE: Sludge recycling
The main issue's of this type of disposal are uptake and bio-accumulation in the food chain or storm water runoff to the surface waters. Hence, strigent regulations regarding concentrations of toxic heavy metals and organics (beyond the regulated limits this stuff becomes a hazardous waste and must be handled as such, with incredible operating cost consequences). Check with your local Environmental office, they are familiar with all of the pertinent regulations and requirements and applicable permits required.
Hope this helps,
saxon
RE: Sludge recycling
RE: Sludge recycling
RE: Sludge recycling
Re slurry vs. solids as fertilizer: The Metropolitan Milwaukee Sewerage District has for many years used biogas to generate electricity & heat. At their main plant (Jones Island), some of the heat has been used since 1926 to dry & sterilize & pelletize treatment product sold as the fertilizer 'Milorganite.' I believe that removing the water is not energy-efficient -– it only makes for convenience in spreading granular fertilizer on lawns.
At the newer MMSD South Shore plant, biogas is burned to provide electricity for the plant. The treated effluent in slurry form is used as ‘Agri-Life’ fertilizer, which is then spread from 6000 gallon tanker trucks. Below is a link to the Metropolitan Milwaukee Sewerage District:
http://www.mmsd.com/about/page6.asp#Agri-Life
You haven’t mentioned the wastewater source, but some modifications may make the sludge more suitable/safer to use as fertilizer. You should also consider alternatives. Perhaps you are pickling steel and your waste contains heavy metals Cr, Cu, Ni and Zn. You might consider an acid purification unit from some company like Eco-Tec or US Filter. This would give a small amount of more concentrated waste to send to a metals recovery company (Encycle, US Filter, World Resources, etc.).
RE: Sludge recycling
hope this helps.
iski
RE: Sludge recycling
My company has recently developed a patent pending cost effective sludge dryer. Units will be available for rent in late July. The rental and drying costs are offset by reduced transportation costs and an efficiency increase in your current WWTP operations.
I can email a brochure to you. Please email me at:
toddforet@usa.net
Sincerely,
Todd Foret