Sewage sludge recovery
Not merely waste, but a stream with potential to recover energy and resources. The first task is to cut the water that is treated, hauled and paid for. From there, every step gives something back.
The approach
No single technology is best for every plant. The right answer depends on volume, composition, available heat, space, logistics and cost.
Engineering services
From the first survey to the input data for the investment decision. Every proposal starts from volumes, composition, equipment, space and cost.
Technology directions
EKOTANK studies, compares and adapts the technologies of specialised European manufacturers to the specific site.
Known from the inside
Foreign technologies are treated as components of a solution adapted to Bulgarian conditions — not as a ready-made catalogue.
PYREG
Carbonisation and mineralisation of sludge with phosphorus recovery. We have familiarised ourselves with the technology first hand.
ELIQUO STULZ · EloDry
Technical discussions on dewatering, low-temperature drying and waste heat use, including a written assessment of the dewatering stage at Varna.
VEBAG · TopBio
Technical meeting and review of a container thermal configuration for small and medium plants.
TopBio-R
Studied solution for wet flue gas cleaning that returns the heat to the heating circuit.
ECOSystem
Studied modular solutions for hygienisation, pasteurisation and granulation of sludge and other organic waste.
PhosPRO
Studied microbiological route for phosphate recovery, fittable to an existing plant.
Main project
Engineering study to improve dewatering and recover the sludge — using real data from the plant.
A preliminary technology study run in parallel with Varna. Scale considered: around 20,000 tonnes of sludge per year at roughly 20% dry solids. The next steps are analysis of quality, site and economic parameters.
Regulatory frame
Regulatory requirements are considered when the technology is chosen, not after the equipment has been ordered.
The European move towards resource recovery is set out in Directive (EU) 2024/3019 on urban wastewater treatment. Numerical limit values are given only for a specific project and against the rules in force.
Common questions
If your question is not here, call us — we will answer directly.
Yes. We start by analysing the existing equipment and operating regime. The biggest gain often comes from there rather than from a new machine.
No. Sometimes the result is achieved through optimisation or staged modernisation.
The choice depends on capacity, space, logistics and permitting. That is why we compare all three configurations.
Yes, where the quantity and temperature level allow. It is one of the strongest savings in the whole chain.
Volume, dry solids, material analysis, existing equipment, energy, space and current costs.
Yes. For suitable projects, trials are arranged on site with the manufacturer's equipment and specialist.
Yes. We run the technical correspondence in German and compare the applicable solutions.
In Bulgaria, Germany and other European countries.
Struggling with sludge at your plant?
