Earth Day Reflections: How Reliability Builds a Sustainable Future

Each year, Earth Day calls global attention to the urgent need to reduce pollution and strengthen climate resilience. Engineers are central to that mission, and QEPrize Ambassador Unathi Pretty Mbengwana shares how her work in infrastructure reliability contributes to lasting environmental protection.

Sustainability is often associated with new technologies, but in many communities, it begins with something more fundamental: making sure essential systems work, every day, without fail.

As an engineer in the water and sanitation sector, I work in an environment where system performance is directly linked to environmental protection and public health. My focus is on reliability engineering, ensuring that infrastructure operates consistently, efficiently, and as intended.

When these systems fail, the impact is immediate. Wastewater treatment processes can become unstable, water quality can be compromised, and ecosystems are put at risk. By improving maintenance strategies, strengthening asset performance, and reducing unplanned failures, we are not only improving operations, we are contributing to sustainability.

In this context, sustainability is not theoretical. It is about what works, what lasts, and what protects both people and the planet.

When Sustainability Became Real

Early in my career, I approached engineering as a technical discipline, focused on solving problems as they arose. That perspective changed when I began working more closely with wastewater treatment systems.

I observed recurring equipment failures and how they were affecting treatment performance. Each failure required urgent intervention, but more importantly, it disrupted the stability of the entire process. The result was not only increased costs, but a real risk to environmental compliance and surrounding ecosystems.

That experience shifted my thinking.

I realised that reliability is not just about keeping equipment running. It is about protecting systems that communities depend on. It is about ensuring that what leaves a treatment plant does not harm the environment it returns to.

From that point, sustainability became embedded in every decision I made.

A Challenge Engineers Must Solve

One of the most pressing challenges in the water sector is not simply infrastructure, but the gap between systems and decision-making.

Many organisations have data and tools, but critical knowledge often remains fragmented or held by a few experienced individuals. When that knowledge is not accessible, decision-making becomes slower, less consistent, and more reactive.

This is where engineers have a unique responsibility.

We are not only problem-solvers, we are translators of complex systems into practical action. Today, this role is evolving to include digital thinking.

Through my work and my company, New Innovations Consulting & Projects (NICP), I am developing AI-driven solutions such as Water Treatment Expert AI. The goal is to make expert knowledge available when and where it is needed most, supporting faster decisions, reducing risks, and strengthening system performance.

For young people entering engineering, this is where the opportunity lies. The future is not just about building systems, but about improving how those systems think and respond.

Engineering for Lasting Impact

Sustainability is no longer something we prepare for in the future. It is something we must deliver now.

As engineers, we must think beyond immediate fixes and consider long-term outcomes. We must ask whether our solutions are resilient, whether they protect the environment, and whether they truly serve the people who depend on them.

The future of engineering belongs to those who understand that every technical decision carries environmental and human consequences.

For me, engineering is about strengthening systems so they continue to serve, protect, and sustain life.

Because in the end, sustainable engineering is not defined by what we build, but by what continues to work, long after we are gone.

Read more blogs from our QEPrize Ambassador community here.