The objective of this acitivity is to install and test the system on site, in the bay of Malmfjärden.
The dredging system is designed to be automated and therefore this activity will be used to better understand the system and bring adjustments and calibration to use it in full scale. As a result of the lessons learnt an adjusted plan for the full scale drive of the project will be produced. This will include a final decision of the outlets of the treated sediments. This action is divided into three main phases.
The objective of sub-action B2.1 is to install the dredging system at the test location in Kalmar. This installation will consist of submerging the system down into the dredging area and also install the wire system that controls the dredging units. During this phase the computer program which controls the movement of the dredging unit must be configured to match the set-up of the system. This phase also includes the installation of the treatment system that will take care of both solid and water phase before the final destination. Once the dredging starts this setup must be adjusted to ensure it can perform according to targets.
The objective of sub-action B2.2 is to test the prototype system that includes both the dredging units and also the treatment plant built to deal with sediments and rejected water. Initially, all sub-systems will be tested individually to ensure their function. When ready, the sub-systems will be connected together and a test drive will be performed using the complete system. Several parameters need to be tested and optimized such as inflow, retention time, inlet and outlet quality and others.
This also includes operational aspects of dredging units such as the buoyancy of the underwater equipment, the towing speed of the control raft, the positioning of the wire setup, and the control computer’s calculations of the position of the raft. This is to give a better understanding and final adjustments/optimizations before the full scale dredging starts.
The main objectives are that the treatment system can receive and treat both solid and water phase according to the established quality standards considering the water to be discharged back into the recipient and the further beneficial use of the sediments. This small scale test drive step is crucial in order to bring all the information needed to the project members to perform an adequate dredging, remediation and metal/phosphorus recovery process. There are several factors that play important roles on the dredging itself; dewatering, sediments remediation, and then metal/phosphorus recovery from dry sediments. Without testing it in a small scale and understanding the main parameters to be controlled, the full-scale process can be much more difficult, with higher costs and lower effectiveness.
The objective of sub-action B2.3 is to test and develop methods in laboratory scale for metals and phosphorus recovery from sediments. The idea is that these methods in the future can be scaled up and tested in pilot. The potential methods, to be investigated by Linnaeus University, for metals recovery are: physico-chemical methods (electricity-based processes) , biologically mediated extractive approaches (e.g. bioleaching) and hybrid technologies (Electrochemical simulation combined with bioleaching, Hydrometallurgy). Each method will have advantages and constraints and it will be of crucial importance to test a combination of either two or more technologies (hybrid technologies) in order to compensate the disadvantages inherent to each technology and maximize efficiency and recovery rates.
Project management and project partners need to plan and prepare for the stages in the project.
Dredging equipment will be constructed to suit the project purpose and objectives.
Based on the knowledge of the small scale test, we will perform full scale dredging and treatment.
The focus for monitoring and evaluation is mainly to follow up the effects of the dredging activities.
How to disseminate the technology and results of Life SURE.