Nutrient Concentration & Water Reclamation™ System
Digested Organics has developed an exclusive ultrafiltration (UF) and reverse osmosis (RO) solution for wastewater nutrient concentration and water reclamation. The Nutrient Concentration & Water Reclamation (NCWR)™ System can process raw manure and digestate (from any digester, including our BioEliminator™), along with other wastewaters such as landfill leachate and food/beverage wastewater, and separate the flow into clean, reusable water–ideal for facility re-use or discharge–and concentrated liquid fertilizer. With most materials, we can recover more than 70% of the total volume as clean water while concentrating the nutrients about 3x.
How it Works
Typically we employ screw-presses, rotary screen, or sloped screens to remove large fibrous solids from wastewaters prior to treating them with ultrafiltration.
Here are two FAN Screw-Presses installed at Majestic Crossing Dairy making fiber from raw dairy manure.
For high-solids wastewater like manure or digestate, we first process it using our proprietary stainless steel ultrafiltration modules. Our unique module geometry and stainless steel construction ensures high filtration rates, easy cleaning, and long filter life (10+ years!). The UF modules contain porous metal tubes, allowing them to capture of all the suspended solids, bacteria, and even some larger dissolved compounds. This process results in a thick concentrate stream and a clarified product we call UF Permeate (or sometimes called “tea-water”).
- Porous tubular membranes (3/4”) welded into ASME-rated pressure vessel
- 10’ and 20’ lengths available in any diameter
- Removes 99.9+% of suspended solids and pathogens
- Removes 95+% of total phosphorus from manures
- Designed to last 10-15 years with little downtime, maintenance, or repair
- Can be mounted horizontally or vertically
This is an 18″ x 10′ UF module installed at Majestic Crossing Dairy in Sheboygan Falls, WI. It has been running since late 2016 and effectively processing digested dairy manure, producing a UF permeate with very little phosphorus (<0.2 lbs/1000 gal) and almost no suspended solids or pathogens.
The liquid “tea-water” or UF permeate that exits the UF module is then pumped through our Two-Step Reverse Osmosis (TSRO) process. Instead of exposing traditional RO membranes directly to the UF permeate, which can still contain a large amount of dissolved organic matter that leads to fouling and poor performance, we use another membrane process to first remove the water from the UF permeate. This liberated water is then recovered using reverse osmosis, resulting in a very clean final effluent that is suitable for drinking water for animals, reuse onsite as washdown water, for irrigation, or river discharge. This two-step process results in an overall lower cost of treatment, higher amount of water recovery, and less energy consumed. Digested Organics is the only company in the USA to obtain a discharge permit from the Wisconsin Department of Natural Resources to put water reclaimed from manure into a waterway.
Some benefits of our TSRO Process include:
- Proprietary dual-membrane system
- Produces drinking or discharge quality water
- High resistance to fouling means little downtime for cleaning
- Modular design is scalable to any size operation
The final step is a redundant disinfection using ultraviolet (UV) light. Since nearly all organisms are considered to be removed by the UF and RO, this UV disinfection step is simply an extra precaution. Multiple safeguards ensure that our system will not release water that is not properly treated.
Comprehensive Service Plan
We have created a Comprehensive Service Plan (CSP) to cover all the associated operating costs of the NCWR system with the exception of electricity. With the CSP, you know upfront what it will cost you to process your wastewater. In every case we’ve looked at to date, our system can substantially reduce a facility’s cost for wastewater management. We also remotely monitor the performance of your system and make adjustments as needed, as well as perform quarterly visits for inspection and tuning, provide all required consumables, and ensure your 100% satisfaction.