Super Critical Industrial Solution for Suspended Organic Residual Streams

Publieke samenvatting / Public summary

Wet residual streams remain difficult and/or energy intensive to process or even impossible. Incineration of these streams require a lot of extra energy and subsequent emissions, due to the wet nature of these streams. Valuable components and materials are also lost or can only be converted into unwanted electricity of which buffering is very difficult or costly. Many sources of this nature can be identified with a great diversity of origin ranging from agricultural waste, domestic sewage to industrial flush waste streams. Recent development in the area of super critical water processing offers the opportunity to address the issues mentioned. The trigger for the project is the ambition and continued search for ways to process these wet waste streams in a better and circular way, in a CO2 neutral way and retaining their building blocks including the water. New awareness of the activities of SCW-Systems triggered the idea that this technology may offer that opportunity.

Recognizing the potential of super critical water technology on industrial scale is only the first step. Proving the technology is actually able to process specific wet streams is the next step and the aim of this project. Actual testing in a continuous lab installation should provide the insight if and how the individual streams can best be treated, and the building blocks preserved. The potential impact of the technology is best illustrated by the size of the streams based on some exemplary public data points: wastewater treatment plant (WTP) sludge out of municipalities in the Netherlands is already 1.4 Million T/year. Wet manure 71 million T/y and industrial WTP sludge 1.3 million T/y, More than 90% gets burned. (Source: CBS) The objective is to enable a data driven decision on the full-scale commercial processing of individual waste streams. The project is intended to act as the precursor for a more elaborate program towards a much wider application field in areas of other wet waste streams. This is in full alignment with the objective of TKI-E&I through CO2 reduction, electrification and circular economy.

Korte omschrijving
A detailed analysis of each waste stream will be carried out by the stream owner(s). SCW Systems will design and build the new bench scale test reactor, required pre-treatment installation based on the composition of the streams and the syngas and water treatment. The consortium participants will define the requirements for additional analyses to enable a data driven compact LCA and/or assessment of the results obtained in order to come to a decision in the full-scale commercial processing of individual waste streams. The tests will be iterative in nature to scan the operating window and determine the optimum set of operating parameters. This applies to all 3 sequential processing steps: pre-treatment and mixing, conversion, syngas and water treatment. The feedstock preparation can consist of mechanical, chemical pre-treatment as well as composition optimization through trace component removal or blending. The objectives and high-level results of the project will be disseminated and used for an extensive program to be set up with a positive outcome.

- A newly designed and build bench scale test reactor - Analysed product (waste stream/feedstock) composition - Identification of the pre-treatment requirements per input stream, mechanical and well as chemical - Specification for the design of the pre-treatment installation - Identified optimal process conditions per feedstock such as pressure, temperature and retention time - Identification of the impact of the pre-treatment on the reactor design - Identification of the post-treatment requirements for syngas and water per input stream, mechanical and well as chemical - Specification for the design of the post-treatment installation - Small LCA per input stream (mass-and energy- balance including CO2 footprint)