EUR 20 million order for WABAG from Turkey: Construction of a turnkey wastewater treatment plant in Sanliurfa
— Large-scale municipal treatment plant with a capacity of 145,000 m3/d (721,000 PE)
— Energy-efficient: sludge treatment combining energy production and solar sludge drying units
Just before the turn of the year, a contract was signed regarding the design and construction of a new used water treatment plant at Sanliurfa in south-eastern Turkey. The EUR 20.755 million order from the Ministry of the Environment and Urbanisation is to be co-financed by the EU and WABAG’s modern and highly sustainable plant concept was decisive in capturing the contract.
A new used water treatment plant is to be built in south-eastern Turkey. The site is already employed for this purpose, but the existing ponds only offer inadequate purification and are therefore to be replaced by a modern treatment facility.
The plant design incorporates conventional, mechanical pre-treatment steps, biological treatment using the activated sludge process and secondary clarifiers as well as a UV-disinfection unit. As a result, the purified water will be suitable for both irrigation and service water applications. Water line energy consumption will be cut considerably by intelligent use of the slope on the site, which will allow the gravimetric flow of the used water through the plant without the necessity of a pumping station. Exhaust air cleaning will round off the plant design.
Using the power of the sun. One of the world’s largest solar powered sewage sludge drying systems is to be installed in Sanliurfa.
The sewage sludge emanating from the treatment process is to be anaerobically stabilised and the resultant biogas used for electricity generation, thus rendering the plant 95 per cent energy self-sufficient. The digested sludge will be subsequently dewatered and then transferred to a solar sludge drying system, which represents a special plant feature. The moist sludge will be dried in solar powered greenhouses in an environment-friendly manner until it reaches a dry substance content of up to 85 per cent. The Sanliurfa system will occupy an area of 24,000 m2 and thus be one of the largest of its type in the world. The end product consisting of granulated sewage sludge will possess a high nutrient content and can therefore be employed as fertiliser.
This alternative approach on the part of WABAG’s experts was a decisive factor in the allocation of the contract to the company. Moreover, the Sanliurfa project will serve as an important reference for this future-oriented, sewage sludge treatment method.
The initial plant development phase involves a capacity of 144,833 m3/d or 721,000 PE. However, a second phase for an extension to 165,136 m3/d or 858,000 PE is already considered and will also involve technical expansion for nitrogen and phosphorus removal. The wastewater plant is already designed taking into account the later extension. WABAG is to complete the turnkey plant as the general contractor and start-up is scheduled for 2018.
Following the treatment plants in Siverek and Polatli, the Sanliurfa project is the third contract to be received by the company from the Turkish Ministry of the Environment and Urbanisation and clearly represents confirmation of WABAG’s excellent position in the national market.