Dr Heidi Snyman | Strategic Technical Advisor | WSP Africa | Representative | Network for Industrially Contaminated Land in Africa (NICOLA) | mail me |
Contaminated land is rarely a contained technical problem. A site may have a defined boundary on a map. However, its risks can change as groundwater moves, land use shifts, climate conditions become less predictable and surrounding land uses change over time.
Regulators, landowners, communities and developers may also have different expectations. They may also have different ideas of what a successful outcome should look like. That is why remediation success cannot be measured only by whether a selected technology works.
Treating contaminated land as only a technical problem
The more important test is whether the remedy can work in the setting where it is placed. It must also work over the period for which it is needed. Finally, it must operate under the practical, regulatory, environmental, and stakeholder conditions that will shape the site long after the project team has left.
In my experience, some of the most useful lessons in contaminated land management come from projects that did not behave exactly as expected. A remedy may fail because the technical assumptions were incomplete. Still, it may also fail because the site was poorly understood, future land use was unclear, the maintenance burden was underestimated, or the solution lacked sufficient resilience to changing environmental conditions.
The lesson is not that remediation is becoming impossible. Rather, we need to be more honest about what success requires. Effective management of contaminated land requires solutions that remain fit for purpose long after the initial intervention.
Success has to be designed for context
Around the world, contaminated land professionals are dealing with a more complex operating environment. Water scarcity, extreme weather events, temperature fluctuations and emerging contaminants such as PFAS and microplastics are changing how we approach remediation and long-term site management.
These issues are not separate from the remedy. Instead, they shape whether the remedy will remain effective. In an African context, that point is especially important. Local site conditions, water constraints, regulatory expectations, available technical capacity and the practical need to return land to a safe and useful purpose all shape contamination and remediation challenges.
The best remedy is not always the most complex or technology-heavy option. Instead, it is the option that reduces risk in a way that teams can implement, monitor, maintain and understand.
Through my work, I see the value of bringing industry, academia, service providers and regulators into the same conversation. We support science-based, sustainable best practices in contaminated land management across the continent. That cooperation matters because a single party rarely makes remediation decisions.
Sustainable remediation is not a slogan
Sustainable remediation should mean more than choosing a greener technology. It should reduce unacceptable risk while considering water use, resource demands, implementation practicality, and what the site must support afterwards.
In essence, we need to ask ourselves what the Net Environmental Benefit (NEB) of a remediation plan is. Nature-based and low-carbon solutions have an important place in this conversation. However, they are not automatically suitable in every case. Technology should not be selected because it sounds more advanced. Instead, teams should select it because it fits the contamination risk profile, groundwater conditions, exposure pathways, the people affected by the site, and the site’s future.
The same applies to engineered interventions. Containment, removal, treatment, monitoring or managed risk reduction may each prove appropriate. The critical question is which option is most likely to keep protecting people and the environment over time. Again, it boils down to the solution with the best NEB.
This is where lessons from both remedy failures and successes become useful. Failures show us where assumptions were too optimistic. Successes show us where technical design, implementation, governance and long-term land-use thinking came together. These lessons are particularly important when managing contaminated land because site conditions can evolve long after remediation begins.
From cleanup to productive land use
The Delta E.M.D site in Mbombela is a useful example. The former electrolytic manganese dioxide manufacturing facility required decommissioning, demolition, remediation and redevelopment. In projects of this nature, the value of remediation extends beyond addressing contamination. It also makes it possible to repurpose land safely and productively.
That is a more demanding way to think about contaminated land. It requires a broad technical team to understand the contamination, regulatory expectations, stakeholder confidence and what the site must be able to support afterwards.
This is where remediation success becomes visible beyond the specialist community. A well-managed project can reduce environmental risk, unlock constrained land and support redevelopment. A poorly matched remedy can leave a site technically “managed” but practically limited. For contaminated land, therefore, successful remediation should connect environmental protection with the site’s long-term purpose.
Key questions on contaminated land before remediation
The objective should not simply be to complete a cleanup programme. It should also be to create conditions that allow the land to deliver safe and productive value in the future.
Before deciding on a remedy, we should be asking harder questions:
- What does success look like after five, ten or twenty years?
- Who will be responsible for monitoring and maintenance?
- What happens if rainfall patterns change, water becomes scarcer, or the site is used differently from what was originally intended?
- Are emerging contaminants part of the risk profile?
- Does the remedy reduce long-term liability, or does it simply move the burden into the future?
- Can we prove NEB?
Remediation will always require science, data, modelling, engineering and professional judgement. However, technical competence alone is not enough if the remedy cannot remain effective in the real world.
The real test of a remedy is not whether it looks elegant in a design report. It is whether it continues to protect people, water, ecosystems and future land use after the obvious work is done. That is ultimately what successful management of contaminated land should achieve.
