Singapore’s First Dedicated Facility To Recover Metals From Incineration Bottom Ash To Be Built [Press Release]

July 27, 2014 by  
Filed under News

Singapore, 2 June 2014 – The National Environment Agency (NEA) awarded the tender today to M/s REMEX Mineralstoff GmbH (REMEX) to develop and operate a metal recovery facility to recover ferrous and non-ferrous metals from incineration bottom ash (IBA) generated by the incineration plants.

2 The metal recovery facility is part of NEA’s long-term strategy to manage solid waste in Singapore and also part of the Government’s plans to move towards a resource efficient society. Currently, ferrous metals between 10mm to 300mm in size are being recovered from the IBA using magnetic separators at the incineration plants and the residual IBA is sent to the Semakau Landfill for final disposal. This conventional treatment system leaves the non-ferrous metals, such as aluminium and copper, and the remaining smaller pieces of ferrous metals that are still of economic value, intact in the residual ash.

3 As part of the effort to maximise resource recovery, ferrous metals larger than 4mm in size and non-ferrous metals larger than 2mm in size would be further extracted from the IBA using magnetic separators and eddy current separators, which are placed along the conveyors at the metal recovery facility. The resultant IBA could possibly be further treated to be used as materials for road construction and concrete applications.

4 “The setting up of REMEX’s metal recovery facility is part of NEA’s long-term plan to improve resource efficiency. NEA is currently studying possibilities for ash reuse, which will help resource-scarce Singapore to further increase resource recovery, as well as extend the lifespan of Semakau Landfill,” said NEA Chief Executive Officer, Mr Ronnie Tay.

5 REMEX will begin construction of the metal recovery facility in October 2014 and its estimated investment for the project is about S$15 million. The metal recovery facility, expected to begin operation by mid-2015, will be able to process up to 1,800 tonnes of IBA per day generated by the four incineration plants (i.e. Tuas Incineration Plant, Senoko Waste-to-Energy Plant, Tuas South Incineration Plant and Keppel Seghers Tuas Waste-to-Energy Plant). (Refer to Annex A for more details.)

6 REMEX, which specialises in metal recovery from IBA and operates similar facilities in the Netherlands and Germany, has set up a local, wholly owned subsidiary in Singapore known as M/s REMEX Minerals Singapore Pte Ltd, to operate the metal recovery facility.

Annex A

FACTSHEET ON THE DEVELOPMENT AND OPERATION OF METAL RECOVERY FACILITY FOR INCINERATION BOTTOM ASH

Background

1 In August 2013, the National Environment Agency (NEA) launched an open tender for the development and operation of a metal recovery facility for incineration bottom ash (IBA), to recover both ferrous and non-ferrous metals from the IBA generated by the incineration process.

2 The main objective of the metal recovery facility is to maximise resource recovery. In conjunction with this, NEA is also looking at options to process the resultant IBA from the material recovery facility for safe application so that the IBA can be diverted from Semakau Landfill and help prolong the landfill’s lifespan beyond 2035.

3 Currently about 1,600 tonnes per day of IBA is being generated by the four incineration plants (i.e. Tuas Incineration Plant, Senoko Waste-to-Energy Plant, Tuas South Incineration Plant and Keppel Seghers Tuas Waste-to-Energy Plant). Ferrous metals between 10mm to 300mm are removed from the IBA before the residual ash is sent to the Semakau Landfill for final disposal. This conventional treatment leaves the non-ferrous metals and smaller fractions of ferrous metals that are still of economic value intact in the residual ash.

Award of Tender

4 After evaluation, the tender has been awarded to M/s REMEX Mineralstoff GmbH (REMEX). REMEX specialises in metal recovery from IBA and operates similar facilities in the Netherlands and Germany. It has established a local, wholly owned subsidiary in Singapore known as M/s REMEX Minerals Singapore Pte Ltd to operate the Singapore facility.

5 REMEX will construct the facility at a 1.4 hectare site located next to the Tuas Marine Transfer Station (TMTS) and NEA accepted its offer to pay a rental rate of $60,000 per month for the land site. The initial 3-year Term of the Tenancy Agreement will commence from 1 October 2014 to 30 September 2017. When the term expires, REMEX has the options to extend for a further two terms of three years each.

6 REMEX will begin construction of the metal recovery facility in October 2014 and its estimated investment for the project is about S$15 million. The facility will be capable of processing about 1,800 tonnes of IBA per day and is expected to commence operation by mid-2015.

Process at the Metal Recovery Facility

7 When the metal recovery facility is in operation, all IBA generated by the incineration plants will be sent to the facility for processing. At the facility, both ferrous and non-ferrous metals will be recovered from the IBA by the use of conveyors, magnetic separators and eddy current separators. REMEX’s proposed process can recover about 90% of the ferrous metals of size above 4mm and a slightly lower proportion of non-ferrous metals above 2mm.

8 REMEX would be shipping the non-ferrous metals, e.g. copper, zinc, lead, aluminium, recovered from IBA to Europe for further separation and sell them at the prices transacted on the London Metal Exchange. However, REMEX is currently looking for possible off-takers locally or regionally, i.e. China or Malaysia, if it is economically more viable.

9 The remaining IBA after the metal recovery process will then be transported to TMTS to be sent to the Semakau Landfill for final disposal.

Source: NEA

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