This process utilizes chemicals to precipitate and flocculate phosphorus and fine solids. After the chemical addition, the coagulated solids are dewatered using a porous, inclined belt. Further dewatering of sludge is completed using a screw press separator.
- Chemical Flocculation
- Equipment Vendor
- Concentrated Nutrients
Technology Strengths,Weaknesses and Critical Indicators
Chemical flocculation technologies remove the non-dissolved particles from the waste stream typically resulting in irrigation quality “tea water”:
- Produces a clay like cake which is high in phosphorus and with significant amounts of organic nitrogen.
- Technologies include belt presses, centrifuges, dissolved air flotation systems and others all of these technologies require flocculants to achieve high rates of solids removal
- There is significant variation of chemical and energy use depending on site and by technology
- There is significant variation of operational intensity depending on site and by technology
- There is significant variation of cost depending on site and by technology
- Proven technology for nitrogen recovery, phosphorous recovery, storage reduction, GHG reduction, and odor control
Suspended solids/phosphorus recovery technologies:
- Produces a concentrated source of phosphorus from a renewable source
- Include belt presses, centrifuges, dissolved air flotation systems and others
- There is significant variation of chemical and energy use by site and by technology
- There is significant variation of operational intensity by site and by technology
- There is significant variation of cost by site and by technology
The AL-2 system is a Danish technology that has been deployed on U.S. dairy farms since 2012. AL-2 uses chemicals (ferric chloride, alum & polymers) to enhance phosphorus recovery from dairy and livestock manure. The AL-2 system is compact and scalable, treating manure from as few as 200 to over 5,000 milk cows. AL-2 works best when treating manure with 4 to 8% totals solids, including coarse solids. Chemical requirements will vary depending on the desired level of phosphorus and solids removal as well as the chemical makeup of the manure. The AL-2 technology has been able to achieve 90% removal of phosphorus from liquid manure, creating a manure fiber product with increased levels of phosphorus.
Newtrient will continue to work with AL-2 to further refine the cost and performance information as more information comes available from the existing dairies.