The Tuas Nexus facility is an innovative and sustainable solution to meet Singapore’s long-term solid waste management and used water treatment needs. Tuas Nexus is the integration of the National Water Agency (PUB)’s Tuas Water Reclamation Plant (Tuas WRP) and the National Environment Agency (NEA)’s Integrated Waste Management Facility (IWMF).
The fly-ash-washing (FAW) process from AIK Technik AG is used to treat the fly ash of the waste gases produced in the waste incineration process. In the upstream extraction process, acidic washing water from the flue gas cleaning process is mixed with fly ash. During this process, metals such as zinc, copper and lead, as well as other salts, are separated from the ash. These metals then enter the liquid phase and are subsequently removed from the fly ash by filtration and filter cake washing in the FAW process. In this way, the recovered secondary raw materials from the fly ash can potentially be reused sustainably and as economically as possible. After processing, the remaining treated fly ash can easily be disposed of in an environmentally compatible manner.
For this large-scale project, BHS is supplying two rubber belt filters of type BFR 320-150 in a customized design. These continuously operating horizontal vacuum belt filters reliably separate rapidly sedimenting solids from suspensions – which makes them ideal for the efficient separation of fly ash and washing water. At 320 cm, the filters are 30% wider than the largest standard models and provide a filter surface of 45 m2.
The filters are currently in production at the BHS headquarters in Sonthofen, Germany and will be delivered to the customer later this year. The commissioning of the complete flagship plant in Singapore is scheduled in several stages up to 2025.