Sludges & Biosolids

Understanding Biosolids. Enabling Better Decisions

Managing biosolids is one of the significant challenges facing wastewater operators and communities across New Zealand.

Every year, thousands of tonnes of biosolids are generated through wastewater treatment processes. Decisions about how these materials are managed require careful consideration of environmental effects, regulatory requirements, community expectations, operational constraints and long-term sustainability.

There is no one-size-fits-all solution. The most appropriate approach depends on the characteristics of the biosolids, local conditions, available infrastructure, regulatory requirements and the outcomes sought by the community.

LEI helps clients understand their options and develop practical, science-based solutions for the management, treatment, reuse or disposal of biosolids and other water and wastewater sludges.

Balancing Risks, Opportunities and Expectations

Biosolids management decisions often involve balancing multiple considerations.

These may include:

Environmental risks and safeguards
Resource recovery opportunities
Landfill availability and costs
Carbon and sustainability objectives
Regulatory requirements
Community expectations and social licence
Long-term operational considerations

Lets Talk About Your Biosolids Challenge

LEI has experience supporting councils, infrastructure providers and private organisations with biosolids management, land application assessments, beneficial reuse investigations, resource consenting and strategic planning.

Our team combines technical expertise in wastewater, soils, land treatment and environmental management to help clients make informed decisions and successfully implement their chosen approach.

Whether you're developing a long-term biosolids strategy, assessing beneficial reuse opportunities, planning a land application scheme or investigating disposal alternatives, LEI can help.

Biosolids Mangement Services

LEI provides specialist technical advice across the full biosolids management lifecycle, from initial investigations through to implementation and ongoing compliance.

Our services include:

Biosolids sampling and characterisation
Biosolids management strategies
Risk assessments and risk management planning
Site selection and suitability assessments
Beneficial reuse assessments
Land application assessments
Resource consent applications and Assessment of Environmental Effects (AEE)
Regulatory approvals and compliance support
Stakeholder and community engagement
Management planning
Sludge removal, dewatering and transport and application planning
Independent technical review and peer review