Let us present a new tochnology where we by freezing, thawing and drying, dewaters and dries different types of sludge. Completely without the addition of polymers and with minimal energy use Freeze Dry Unit dewaters and dries sludge, slurries, residues, dregs and other materials with high water content to get a cleaner water and a valuable final product.
Residues from fish farms often comes in the form of sludge. These must be taken care of resue and to recirculate the water.
Sludge from biogas production differs from that of municipal wastewater sludge as sludge from biogas can contain crops, manure, residues from farms or slaughterhouses.
In the food industry a lot of the residues from the processes are in the form of sludge and contain valueable economic values, but also the possibility to reuse or create new products. Today there is challenge to effectively make use of these.
In cellulose industry Freeze Dry Unit has several areas of use. The machine can be used to treat different fractions of sludge that results from the paper pulp process and for dewatering and drying of residues.
The nuclear industry produces a radioactive sludge. In the ion exhange process a radioactive sludge is recieved as nuclear particles are trapped inside and forms a sludge like waste that must be taken care of.
Today a lot of the sludge from municipal wastewater treatment plants is dewatered to a dry solid content of 20-30 %. This results in high costs and other problems.
The Freeze Dry Unit can treat almost every type of sludge. Freeze Dry Unit can treat sludge regardless if it comes from a wastewater treatment plant, paper pulp or food industry. Freeze Dry Unit dewaters and dries the sludge to a dryness of 95 percent or the degree of dryness desired by the custumer.
By using a method, unlike the competitors, that doesn't requre the addition of polymers to dewater the sludge the final product can safely be used as fertilizer on farmland and form a circular economy of phosphorus. Freeze Dry Unit also reduces energy consumption and lowers transports.
The Freeze Dry Unit allow users to save money regarding energy, operation and transportation costs. In addition, the Freeze Dry Unit gives a valuable resource as a final product.
"At Isle, we love to see innovative solutions to major water sector challenges. Elajo's FreezeDry certainly fits the bill; it is a fundamentally different approach that could make sludge treatment significantly more sustainable. We hope the technology meets expectations in large-scale trials and look forward to helping Elajo engage with wastewater companies around the world."
Head of Dealflow
Thursday March 5th, we will be at the North Atlantic Seafood Forum in Bergen!
December 17th we will present Freeze Dry Unit at a network meet in Stockholm
Freeze Dry Unit was met by many stakeholders in Amsterdam
Freeze Dry Unit is presented at Isle Utilities TAG-meeting in London the 21st of November!
We will be at Aquatech in Amsterdam, one of Europes biggest exhibitions for water and wastewater, and present the Freeze Dry Unit to the market for the first time
Polymers are used to floch the sludge and help the dewatering process in tradiotional mechanical dewatering methods, such as a centrifuge or screw press. No polymer are needed as the freezing process in he Freeze Dry Unit separates sludge particles and water.
After the sludge is dried it can be used in an incineration chamber, as fertilizer on farmlands or other ways of disposal. Because the Freeze Dry Unit doesn’t require any polymers or other additives the final product is very suited as a fertilizer, provided that the sludge itself is not toxic.
Reject water could be fed to a water treatment process at the wate water treatment plant, or be collected to be used as ferilizers, if enough nutients are present.
A higher dryness of the sludge opens up more ways of dispsal. For example sludge with a high enough dryness can be incinerated and phosphorus can be mined from the ashes as well as he incineration releases energy that can be used.
A high dryness also reduces the amount of transports needed as there is less water in the sludge. The transports can be reduced by as much as 80 %. This is good for the environment.
Nutrients like phosphorus and nitrogen are vital to the agriculture as they are needed to grow crops. Phosphorus is mined from the ground but deposits have decreased and mining has gotten more expensive. There is also a big evironmental impact when mining phosphorus and with the production of inorganic fertilizers. If nutrients can be recycled, mainly phosphorus, a big part of the phosphorus in sewage sludge could replace phosphorus that in other case would be mined.
Nutrients in the sludge are mostly nitrogen and phosphorus. Most of the phosphorus are bound to the sludge and will end up in the sludge after the process. Nitrogen is more present in the water and will therefore end up both in the sludge and in the process reject water, but mostly in the sludge.
Thera are also often heavy metals in sludge. These are bound to the sludge particles and stays in the sludge after the dewatering and drying process.
If the sludge fed into the Freeze Dry Unit has a DS of 2 % the needed energy is 20-50 kWh depending on sludge type. This equals to 2,5 kWh/kg DS.
It is a continuous prcess.
It is possible to add a step of hygienization where the sludge is helt above 70 degrees Celsius for a minimum of one hour.
Freeze Dry Unit is fully scalable and is not restricted by volume.