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Wastewater Project of the Year: Shortlist

For the wastewater project, commissioned during 2018, that shows the greatest innovation in terms of optimising its physical or environmental footprint.

Shortlisted Nominees

 

Fengshanxi water reclamation project, Taiwan

What is it?

A new 25,000m3/d reuse facility attached to a 109,600m3/d wastewater treatment plant outside the city of Kaohsiung, Taiwan. Expansion of reuse capacity to 45,000m3/d is expected by August 2019.

Who is involved?

The facility was built under a build-transfer-operate (BTO) contract between Kaohsiung City Government and the Blue Whale Corporation, a joint venture between two large Taiwan-based contractors, HDEC and CTCI, and was supported by Taiwanese consulting firm MAA. UF membranes were sourced from Suez and RO membranes from Toray. Stantec is the appointed consulting engineer for Kaohsiung City Government.

What makes it special?

In order to maximise operational efficiency, Kaohsiung chose to tender a single, 17-year BTO contract for the reuse facility and the 7km pipeline carrying treated water to Linhai Industrial Park, as well as upgrading and operating the existing WWTP. The financial gains from this integrated approach will allow Blue Whale to recover construction costs within three years of completion of the project’s second phase in August 2019.

The facility’s innovative ‘vertical’ design allowed it to fit neatly on a 0.7-hectare strip of land on the edge of the WWTP. this reduced footprint was achieved by placing tanks and pumps underground, beneath the UF and RO units.

 

The final product water tank is also underneath the exhibition centre. The design was achieved without any compromise in quality; on most indicators the facility’s end product compares favourably with the highest global quality references for reclaimed water.

The city of Kaohsiung has sought to engage the population by building an interactive exhibition centre on the site. The VR devices and large theatre within aim to educate local residents on the benefits of water reuse and have proved a popular visiting spot.

 

Madinat Salman Plant, Bahrain

What is it?

A 40,000 m3/d sewage treatment plant serving the new town of Madinat Salman on an artificial island off Bahrain’s northern coast.

Who is involved?

Stantec Khonji was the project management consultant for the plant. VA Tech Wabag was the EPC contractor and will operate the facility for five years. The client is Bahrain’s Ministry of Housing.

What makes it special?

The sewage treatment plant was built atop Bahrain’s main source of potable groundwater, the Alat aquifer, which is also the country’s last to be spared saline intrusion. The contractors deployed special care and expertise in protecting this precious resource while stabilising the reclaimed land above with 160 supporting piles. The 85,000 m3/d terminal lift pumping station which feeds the plant was also built underground with particular care for the underlying aquifer.

 

The plant was built at the same time as the Madinat Salman new town which it serves. The landscaped views that this innovative urban development project offers are protected by recreational greenery on a hill which hides the STP from view.

The new plant contributes to Bahrain’s efforts towards a circular economy by recycling its dewatered sludge into fertiliser pellets, which are packaged on site in 25kg bags ready to be used by farmers.

 

Prague Central WWTP, Czech Republic

What is it?

A new 350,000m3/d replacement for Prague’s main wastewater treatment complex, which was damaged in a 2002 flood. The new plant also has an additional 260,000m3/d of emergency capacity for primary treatment and discharge of stormwater.

Who is involved?

The DBO contract was signed between the local utility, Pražské Vodovody a Kanalizace (a subsidiary of Veolia) and a consortium comprising Suez, WTE, Hochtief and SMP.

What makes it special?

The plant is located on Císarský Ostrov, an island in the middle of the river Vltava, just across from Prague Zoo and the 17th century Troja Palace.

 

So as not to disturb this landscape where tourists flock, the plant was built almost entirely underground with state-of-the-art soundproofing and the highest levels of odour treatment. Its roof is covered by a park which will soon be open to the public.

Císarský Ostrov offered limited space alongside the older facility, so the new plant’s designers were forced to get creative. Using Degrémont’s Densadeg technology, which combines lamellar settling and sludge thickening in one compact unit, four biological treatment lines and rectangular settling tanks, the new installations provide a level of treatment that ensures long-term compliance with EU standards, eliminates phosphorus and nitrogen, all while fitting in a 600×130 metre rectangle.

 

The older plant on the island was damaged when the Vltava burst its banks in 2002. To prevent this happening again, the new facility integrates advanced flood protection, including high retaining walls along its perimeter and a permanent drainage system. These features were designed based on once-in-a-century flooding levels to ensure maximum durability. The plant’s emergency stormwater treatment capacity also aims to prevent sewer overflow in case of exceptional rainfall.

 

Utrecht WWTP, Netherlands

What is it?

An extension of the main wastewater treatment works in the city of Utrecht serving nearly half a million customers.

Who is involved?

Local water board De Stichtse Rijnlanden contracted Dutch construction companies Heijmans and GMB to design, build and maintain the facility for ten years. Royal HaskoningDHV provided the Nereda technology at the heart of the plant’s treatment process.

What makes it special?

The plant’s location in a residential area of Utrecht means the Nereda technology’s small footprint is a considerable advantage both in the facility’s design process and to minimise nuisances to neighbours. The new units fit neatly alongside the existing works and feature state-of-the-art odour control.

The new facility will reduce power consumption by a third compared to existing treatment at the plant, while meeting the highest treated water standard of 5mg/l total nitrogen and 0.5mg/l total phosphorus.

 

In addition, this performance is achieved without chemical dosing, which contributes to the facility’s minimal environmental impact.

While building on the experience of over 65 Nereda installations worldwide, the Utrecht facility marks a new watershed for the use of the technology, and will act as a forerunner for other large-scale Nereda plants in Dublin and Blackburn, currently under construction.

 

The Global Water Awards 2018 is proudly sponsored by:

Evoqua logo, links to Evoqua homepage

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