Steel structures and assembly
- Heavy structures for factories, halls and industrial buildings
- Tanks and vessels for treatment plants and industry
- Assembly, dismantling and mobile teams in Bulgaria and Europe
Sofia · Bulgaria · Germany
We build the plant.We understand the process.
Steel structures, tanks and industrial assembly. Engineering solutions for wastewater treatment plants and sewage sludge recovery.
2009
Working on sewage sludge since this year
4technologies
European solutions we know from the inside
18,000t/year
Scale of our engineering studies
BG · DE
Projects in Bulgaria and Germany
Two directions
Steel and process.
We build the steel equipment for wastewater treatment plants and we know what happens inside it. That combination is rare.
Sewage sludge recovery
- Plant survey and analysis of the dewatering stage
- Technology chosen from the real flow and composition
- Trials, concept and data for the investment decision
The path of the sludge
Sludge is not waste.
Landfilling and spreading on farmland are being closed off across Europe. We turn the task around: less volume, fewer truck runs, energy from the material itself, and phosphorus that sells.
- 1
Sludge
2%
dry solids leaving the digester
- 2
Dewatering
22%
screw press and the right polymer
- 3
Drying
92%
low temperature, using the plant's own heat
- 4
Thermal treatment
650 °C
the volume drops sharply
- 5
Phosphorus
20%
in the ash, ready for the fertiliser industry
Sound familiar?
The problems we solve.
No single technology is best for every plant. The right answer depends on volume, composition, available heat, space, logistics and cost.
- Poor dewatering and too much water in the final material
- High transport and disposal costs
- Outdated centrifuges, presses and operating regimes
- Unsuitable polymer or incorrect dosing
- High electricity use and unused waste heat
- Not enough space for a large stationary plant
- Odour, dust and contaminated flue gas
- Uncertainty about which technology is economically justified
- A need for a real trial before investing
- A need to coordinate with a foreign manufacturer
- 1
The data
Flow, sludge quality, existing equipment, energy, space and current costs.
- 2
The comparison
The applicable technology paths side by side — not one machine, but the whole route.
- 3
The concept
Equipment configuration with indicative capital and operating figures.
- 4
The check
Technical discussions and trials with the manufacturer's equipment and specialist.
Technologies and partners
We work with the manufacturers.
Direct contact with the makers of Europe's leading sludge technology. We have visited their works and their operating plants.
PYREG
Carbonisation with phosphorus recovery
What remains is ash with up to 20% plant-available phosphorus — raw material for the fertiliser industry. For plants from 30,000 population equivalent upwards.
ELIQUO STULZ
Low-temperature drying
Up to 92% dry solids using heat from the plant itself. Dried sludge becomes a storable raw material and a usable fuel.
TopBio · VEBAG
Container incineration
Semi-mobile plant in a shipping container, up to 5,000 tonnes a year. It also makes economic sense for small plants from 10,000 population equivalent.
ECOSystem
Hygienisation and granulation
Sludge becomes a pasteurised granulate for agriculture. A separate module recovers phosphates and can be fitted to any plant.
Projects
Work on real sites.
Bulgaria's largest treatment plants and heavy industry — with data measured on site, not catalogue solutions.
Varna WWTP
15,000 – 18,000 t/year
Plant survey, analysis of the dewatering stage and the operating centrifuge, polymer optimisation, comparison of drying, carbonisation and phosphorus recovery, and an organised press trial under real conditions.
Plovdiv WWTP
20,000 t/year
Preliminary technology study for sludge recovery at around 20% dry solids, run in parallel with Varna.
“Asarel”
130 m structure
Concept for protecting a concrete industrial structure against water ingress through its vertical joints, with full lining of the vaulted section and an assessment sought from industrial coating specialists.
About EKOTANK
Bulgarian base. German standard.
An engineering company from Sofia with two directions: heavy steel structures and environmental technology. Since 2009 we have worked on sewage sludge recovery — from the first pyrolysis studies to complete solutions for Bulgarian cities.
- Experience on operating industrial sites
- Own facility and mobile teams
- We work in Bulgarian, German and English
Struggling with sludge at your plant?