Larnaca with is nearly 80,000 inhabitants, located at the the southern coast of Cyprus, is the third largest city of the Republic of Cyprus. The sewage treatment plant of Larnaca was built in the seventies and lies on the city’s southern outskirts, directly between the airport and the coast line. The plant consists of a mechanical pre-treatment stage, two aeration tanks, two secondary clarification tanks and several sludge beds. The treated wastewater is intermediately stored in a large lagoon. In summer, the water is used as service water in agriculture, after chlorination.
To meet the high requirements of a modern sewage treatment plant, the city started in 2007 to plan a new plant with a MBR solution. Another strong argument for modernisation was long dry weather periods which lead to an increasing demand for hygienic service water for agricultural purposes. Besides, on Cyprus, they generally have a positive attitude towards new technologies due to other membrane projects which already have successfully been implemented on the island. The concept for the future includes a membrane bioreactor as the heart of the plant, a new mechanical treatment stage and a solar sewage sludge dryer. A daily rate of 18,000 m³/d has been determined for phase B (2027 scenario) and 22,000 m³/d for phase C (2047 scenario). According to the present tender the mechanical treatment stage will be completed under phase B and the construction work under phase C. Future increases in flow rates have thus been considered in the concept.
The tender was started in autumn 2012, after the future plant operators had visited some installations of different plant and system suppliers. It took several months to look through all the bids. Finally, the consortium of WTE (water technology specialists, Essen, Germany) as consortium manager, the Cypriot construction company Miltiades Neophytou and HUBER SE as supplier could win the tender for the supply of the core components as they had submitted the most favourable proposal of all invited bidders. In August 2012, the consortium received the order for the turnkey modernisation of the entire sewage treatment plant including a 12-months operation period.
The work for the new STP starts at the end of 2012. Plant commissioning is scheduled to take place at the end of 2013. With more than 50,000 m² membrane surface the plant is one of the biggest HUBER membrane projects so far and will represent another outstanding reference installation and an example of modern wastewater treatment technique.