Demetalization of sewage sludges through physico-chemical processes

  • From Spain
  • Responsive
  • Research Services and Capabilities

Summary of the technology

The agronomic use of sewage sludge has as main constrain the presence of high content of heavy metals. The proposed process optimizes their dissolution by a suitable combination of acid and complexing agents as extractant and thereafter the recovery of metal-enriched fractions using membrane separation and cation exchange techniques.


Details of the Technology Offer

New and innovative aspects

Different processes have been effectively used for the demetallization of sewage sludge: chemical extraction, bioleaching, electrokinetic processes and supercritical fluid extraction. Of all these, is the chemical extraction which achieved the most promising results of implementation, although due to the high variability in the origin and state of sludges, the high treatment volume and the associated cost, is essential to achieve the maximum metal recovery with the minimum operating cost, which is achieved by optimizing the extractive agent and an appropriate combination of membrane separation processes and cation exchange resins.

Main advantages of its use

The experiments carried out by the research group UBUCOMP, show that it is possible to achieve a significant decrease in the metal content of sewage sludge, whether from primary, secondary or after anaerobic digestion processes. The scaled to pilot plant is feasible from an operational point of view and costly efficient, constituting one interesting option for obtaining a final demetallised sludge with a potential use as organic fertilizer.


The reduction in the metal load of sewage sludges in an in situ process to be introduced in the treatment plant, is a feasible option in terms of technical and economic balances and can be added to the actual management scheme of sewage sludge. The improved process allows the recovery of metal fractions and a final product with a high organic matter and nutrient contents, that can constitute the basis for the formulation of an organic fertilizer.


This technique would be of interest to stakeholders involved in sewage sludge management, sewage treatment plants, landfills or industrial plants that generate effluents with high organic and metallic charge.

Current development status

Research or Experimental

Desired business relationship

Technical cooperation - further development

Related Keywords

  • Chemistry
  • Protecting Man and Environment
  • Waste Management
  • Waste desinfection / detoxification
  • Sustainability
  • sewage sludge
  • demetalization
  • organic fertilizer
  • heavy metals
  • engineering & technology


The aim of the The Technology Transfer Office (TTO) of the Univesidad de Burgos is to promote Innovation technology through the reseach results transfer and the conexions between the University and the new needs and requirements of the society - we are the link between the University and the Industry. Contact person: José Manuel López (


Never miss an update from UNIVERSIDAD DE BURGOS

Create your free account to connect with UNIVERSIDAD DE BURGOS and thousands of other innovative organizations and professionals worldwide


Send a request for information

About Technology Offers

Technology Offers on Innoget are directly posted
and managed by its members as well as evaluation of requests for information. Innoget is the trusted open innovation and science network aimed at directly connect industry needs with professionals online.


Need help requesting additional information or have questions regarding this Technology Offer?
Contact Innoget support