Initiative: Sustainable Management of Non-Recyclable Plastic Waste

We encountered a significant challenge in managing non-recyclable plastic waste, particularly thin plastic materials with no commercial recycling value. Very few recyclers or waste collectors were willing to purchase this waste because the costs of collecting, sorting, and processing these lightweight materials far exceeded their post-consumer market value. As a result, large quantities of such waste accumulated within our premises.

The accumulation eventually reached a level where managing it became a herculean task for the hospital’s waste management department. Handling large volumes of non-recyclable plastic waste poses a major operational challenge, especially in a hospital environment where space constraints, hygiene standards, and strict regulatory compliance are critical. Since these materials have little or no recycling value, they create a bottleneck in the overall waste management system.

Existing waste management frameworks offer limited innovative solutions for the sustainable disposal of thin, non-recyclable plastic waste. Therefore, Amrita Hospital’s primary objective was to indigenously develop an environmentally friendly and sustainable technology to manage this accumulating waste while promoting resource recovery and circular economy principles.

Amrita Hospital has established an innovative and sustainable technology for managing the non-recyclable plastic waste generated within its facility. This initiative promotes resource conservation, minimizes waste, and supports sustainable economic practices. The hospital has indigenously developed a unique technology to convert very thin, non-recyclable plastic waste into plastic building blocks. These blocks are manufactured using non-infectious, non-recyclable plastic waste — such as single-use plastic bags and multilayer plastic wrappers — segregated from the general solid waste stream.

The technology follows a circular economy model in which energy is recovered and reused through the following process:

• Biogas Generation: Residual sludge from the hospital’s Effluent Treatment Plant (ETP) is converted into biogas using an anaerobic digester.

• Fuel and Steam Recovery: The biogas produced in the sludge digester is utilized as fuel for the hospital’s incinerators. The high heat generated during incineration is recovered in the form of steam.

• Manufacture of Plastic Bricks: The recovered steam is subsequently used to manufacture plastic blocks from the segregated non-recyclable, non-infectious plastic waste. Approximately 2.5–3.0 kg of plastic waste is compressed into a single block, which is then encased in a concrete mixture to produce a durable composite brick. These plastic bricks are primarily used for landscaping

The implementation of this technology has enabled the hospital to constructively reuse approximately 240–350 kg of non-recyclable plastic waste per day. At present, around 82 plastic bricks are manufactured daily, and these are utilized for fencing and landscaping within the hospital premises. The manufactured plastic bricks have also undergone strength testing to evaluate their structural performance.

No significant challenges were encountered during the implementation of this technology. The hospital management has consistently supported and encouraged environmentally sustainable initiatives, which played a key role in the successful execution of the project.

Plastic waste bricks provide an effective solution for safely encapsulating thin, non-recyclable plastic waste that would otherwise remain in landfills for centuries. However, these bricks should be regarded as composite construction materials, similar to concrete products, rather than pure plastic products, to ensure adequate structural stability and fire safety. Although they are well suited for landscaping, fencing, and other non-structural applications, the use of these plastic composite bricks for load-bearing building construction is not recommended, considering factors such as drilling, fire resistance, and overall structural safety.