Darnasus is an Engineering firm specialising in water treatment, with experience in delivery and operation of innovated compact units for the treatment of aircraft effluent. The treatment of aircraft sewage is becoming essential at Airports, due to biocide chemicals contained in the blue deodorant liquid used in aircraft lavatories worlwide. This substance can potentially cause damage to domestic biological wastewater treatment plants as this chemical destroys useful bacteria, slows down biological oxidation and creates a sharp increase in ammonia levels. Darnasus Engineering Ltd offers a unique proposal to Airports in resolving this shortcoming, with efficient and innovated equipment at ZERO cost to the Airport. Darnasus Engineering Ltd is an experienced firm in the field and has designed, constructed and is succesfully operating the wastewater treatment plants at Larnaca & Paphos Airports in Cyprus for over 6 years now. Darnasus Engineering Ltd can finance, install, commission and operate the facilities based on a Build – Operate - Own contract.