AIK Technik AG to Supply Acid Fly Ash Washing System for Tuas Nexus Integrated Waste Management Facility (IWMF) in Singapore

AIK Technik AG, a plant engineering company based in Switzerland, has been awarded a contract by Keppel Seghers to supply the complete FAW (acid fly ash washing) plant in Singapore for Tuas Nexus IWMF (Phase 1).

Tuas Nexus is the world’s first integrated waste and used water treatment facility, which was conceptualized from the ground up. It was initiated to reduce the environmental impact of waste and used water in Singapore.

Tuas Nexus IWMF is a flagship waste management facility of the National Environment Agency (NEA) in Singapore. When completed, Tuas Nexus IWMF will be the largest Waste-To-Energy facility of its kind in Singapore, with an incineration capacity of up to 5,800 tons of waste per day. Tuas Nexus IWMF can process over two million tons of waste per year, which can free up landfill space for non-incinerable waste and residual material at Semakau Landfill. It is expected to be operational in phases from 2025 onwards. The facility will set new standards in technology and innovation in residual waste treatment while recovering energy from waste.

AIK Technik AG has been contracted to build the FAW (acid fly ash washing) plant for Tuas Nexus IWMF (Phase 1) in 2021. The FAW plant will be an important part of the facility, which will help reducing the environmental impact of residual materials.

AIK Technik AG will be responsible for the planning and design of the entire FAW plant including candle filters and mercury separation in Singapore. That is an important step to ensure that the plant meets the highest standards and delivers reliable results to the operators.

We will supply two complete, parallel FAW plants to Keppel Seghers. These include the candle filters, mercury separation, ash handling, extraction, filtration, lime handling, washed ash transport and various buffer and pumping systems. A single FAW plant achieves a throughput of 4.7 tons of fly ash per hour. By using the AIK solution, Keppel Seghers can process fly ash in a more environmentally friendly manner, more efficiently and quickly. The redundancy provides security and allows for scheduled maintenance of the plant. The plant is designed in such a way that in the future, it may also be possible to recover raw materials such as zinc (FLUREC).

The challenges in this project are the tight space conditions of the plant. These had to be taken into account in the planning to find an optimal solution for the arrangement of the various components.

The whole project impresses with its size. Even the vacuum belt filters, at 320 centimeters, are thirty percent wider than the largest standard models and offer a filter area of 45 square meters. The large number of stacking tanks also allows for a more flexible operation and at the same time creates a larger buffer for intermediate storage.

We will also implement the detailed specifications so that the IWMF is fully tailored to Singapore’s needs. By automating the plant, manpower will be used efficiently.

AIK Technik AG is a globally active plant manufacturer for environmental technology based in Switzerland. The company has the expertise of more than 30 years of experience in the planning, delivery and commissioning of plants for acid fly ash washing and other technologies in the field of recycling plants.

(Published in GLOBAL RECYCLING Magazine 3/2022, Page 30, Photo: National Environment Agency NEA)