Aeration systems Ltd. is a company manufacturing and selling Bulgarian-made aeration systems for wastewater treatment plants. The company holds a certificate for quality, ISO 9001:2015, and the patent for the membrane diffuser.

Aeration Systems Ltd. was established in 1996 following the merger of two firms Ecohydroengineering and Eco-Nik. The company was set-up by Professor Dr. Ilia Papazov and Senior Research Associate Dr. Angel Nikolov, engineers with many years of experience.

Aeration Systems Ltd. specialises in the manufacture of membrane diffusers for air, type DM-320A, and in the design and construction of aeration systems using these diffusers. The main applications are in activated sludge processes and aerobic sludge stabilisation in wastewater treatment plants. Other applications include aerated grit removal plants, equalisation and mixing tanks, flotation tanks, for agitating water and other liquids in industrial production processes as well as fish breeding tanks.

Aeration Systems Ltd. has 100% ownership of all manufacturing equipment (mould, die, models and stands) required to produce the components of DM-320A diffusers (membranes, bearing disks and stainless steel rings for fixing the membrane to the disk) and the relevant sections of the air distribution network (plastic nipples with a seat-shaped lower part, height-adjustable bottom supports, attachment clamps made of stainless steel etc.).

Aeration Systems Ltd. has adopted the principle of sub-contracting the manufacture of the DM-320A components to Partner Organizations, which use the above-mentioned manufacturing equipment owned by Aeration Systems Ltd. The company has permanent framework contracts, which set up the technical requirements of the produced components and conditions for use of the manufacturing equipment. The Partner Organizations, manufacturing the membranes and bearing disks, are also registered to the international ISO quality standard.

The company has its own installation team for pre-assembly of the aeration system components and installation of the aeration system on site.

Aeration systems Ltd. is a loyal partner and fulfils its commitments - from design and construction through to warranty and post-warranty service.