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What Happens To Your Spent Materials?

10 Sep, 2019 5:53:41 PM / by Quek Leng Chuang


Our responsibility at Environmental Solutions (Asia) over your waste starts the moment it is loaded onto our trucks. Serious and careful attention is taken to ensure that the packaging (whether it be drums, jumbo bags or IBCs) containing the spent materials is serviceable, and appropriate for the potential hazard risk of your spent material. Where necessary, such as in the case of spent catalysts, we would provide specialised 2m3 steel bin. Ensuring the proper hazardous communication labels are deployed and displayed prominently. Eliminating the potential hazard risk of your spent materials is a key factor in our journey management process of your spent materials to our facility.


When the materials arrive at our facility, its weight and description is tagged and logged into our inventory system (SAP). Same day samples of the materials are taken, and assays of the relevant target metals are done. These remain in storage for a few weeks, to several months for smaller loads awaiting its turn to be processed.


Some materials require mechanical processing such as mixing, or sieving. Others are scheduled directly for Thermal Processing in our rotary kiln. Our kiln calcines and roasts the metal bearing waste into a metal concentrate, typically reducing the materials mass and volume by a factor of up to 10X. The output from the kiln is typically a metal oxide, or in the case of spent catalysts materials free of Volatile Organic Compounds (VOC) & other Organic materials. The output from the kiln is then cooled and bagged.



No solid residue remains in our processing of your spent material.

The 1MWt heat source for the kiln comes entirely from the gasification of urban wood waste. The primary reason why our operations results in a carbon negative footprint.

The products are then tagged, assay and inventorised, and subsequently scheduled for sale. These products are sold to refiners that complete the 'metal mining' manufacturing chain to upgrade it further into pure metals, and more likely into chemical product of the product.

Environmental Solutions (Asia) works with you and your spent materials, to support the global circular economy by providing a sustainable alternative to the mining of natural resources.

If you're ready to take the next step towards a cleaner, greener future with us, contact us at +65 6653 2299 or get in touch with us today.


Topics: Environmental Offset, Reimagining Sustainability, Sustainability in Singapore, Corporate Social Responsbility, Metal Waste, Wood Waste

Quek Leng Chuang

Written by Quek Leng Chuang

LengChuang is a chemical engineer and an expert in carbonomics. He is the founder and owner of Environmental Solutions (Asia) Pte Ltd.