Pathway 1: Waste Prevention

The easiest method to manage waste is to prevent it from being generated in the first place. Firstly, we need to shift away from single use formats to reuse and refill systems where practical. Although this is easier said than done, but with appropriate regulatory interventions and incentives, it may just be possible. Case in point is the ban on plastic bags - it was easily achieved with sufficient political willpower.

Life extension is the second part of waste prevention. Terms like design-for-maintenance, design-for-repair, and design-for-durability comes to mind in the design of products. Together with appropriate policies and incentives: for example, through repairability labels and right to repair provisions, prevention delivers the highest environmental impact. Naturally, these may not align with corporate goals to increase both the top and bottom lines. There must be ways to increase shareholder value without unconsciously and indirectly costing the environment.

Pathway 2: Biological Processing

Biological processing keeps organic materials cycling in the biosphere by converting them into nutrients or soil amendments. This can take several forms. At the simpler end, composting transforms food scraps and green waste into stable compost that improves the soil for agriculture. Alternatively, anaerobic digestion breaks down organics without oxygen to produce biogas. For higher value recovery, insect bioconversion (e.g., black soldier fly larvae) turns food waste into protein for animal feed, plus by products usable as a soil conditioner.

However, the success of this pathway hinges on clean feedstock: source separation, de-packaging where needed, and strict contamination control to meet feed and fertiliser standards. Incentivising and promoting the business eco-system for this biological processing is critical to creating this circular economy, where organic waste is turned into “raw materials” for another industry.

Pathway 3: Material Recovery & Upcycling

Yes, it is a fancy term for what we call recycling. Material recovery and upcycling is to keep materials in the economic cycle by turning waste back into higher value products. At the “recovery” end, there are a few options:

1. Clean streams of paper, metals, glass, and many plastics can be mechanically sorted, cleaned, and reprocessed into secondary raw materials that displace virgin inputs. This is viable for many materials today, but challenges remain in the sortation of the materials.
2. Waste Electrical and Electronic Equipment (”WEEE”) can yield copper, aluminum, precious, and critical metals - valuable materials in today’s world that are required in electronics manufacturing. With the scarcity of some of these materials, it may be economically viable (and probably more environmentally friendly) to recovery them from WEEE instead of mining them.
3. Pyrolysis can turn mixed or contaminated polymers or food waste into fuel or oils. However, the economics of this depends on the price and quantity of the oils that can be extracted against the high capital outlay. The prime inhibitor for widespread adoption of this technology is the high capital costs and uncertain (and unproven) outputs.

“Upcycling” is to create equal or better utility or better performing materials. Examples include turning multilayer plastic films into durable boards, textile blends into engineered fibers, glass cullet into high value pozzolans, and ocean bound plastics into consumer goods with verified traceability.

What is necessary to make this work at scale is contamination control through source separation and pre sorting. Not forgetting the source of all these lies in well-designed products, i.e., they are designed for recycling so that products can re enter the circular loop when they are created.

Pathway 4: Energy Recovery

Waste-to-Energy (WTE) is more than a disposal solution: it is a complementary pillar that converts waste into usable energy while supporting other recovery pathways. Malaysia’s mixed and high-moisture waste composition provides significant challenges to this technology - requiring pre-processing, reducing combustion efficiency through low calorific values of waste, and thereby potentially increasing pollutant output.

Public concern about WTE often centres on emissions and ash management, and rightfully so. Poor management of incineration can release dioxin, furans, and particulate matter (”PM”), while untreated toxic residues can leach heavy metals into the soil, causing soil and groundwater contamination.

However, recent WTE technologies have evolved significantly. Today’s facilities incorporate multi-layered emission control systems. It includes technologies capable of reducing PM levels and dioxin emission to levels that to meet EU and Japan standards.