Project Results

Functionality tests of the integrated system

Recent trials with the RAZone pilot plant has been concentrated around investigation of both seawater and freshwater exposure to intensive ozonation to test effects of water composition on the production of possible harmful by-products  such as bromine and redox potential, effects on removal of essential and non-essential nutrients ( such as iodide and copper) and  effects on removal of deleterious by-products of fish-farming (nitrite, nitrate, ammonia).  Trials have been run with seawater and fresh water loaded with waste from an experimental RAS stocked with sea-bass and trout respectively. Similar study was done on a control RAS (non ozonated) parallel with the ozonation trials.

Furthermore, a 30 day test has been run in the freshwater RAS with ozonated and a control system to study the effect of ozone dosage used in the experiments related to the water chemistry. The 30 day trials are aimed at investigating the impact of extended exposure to ozone on fish health.

Attained Findings

Ozonation was found to remove (oxidise) nitrite and iodide very quickly, but more slowly organic matter and copper  from seawater. The removal of iodide and nitrite is slowed down in the presence of organic matter indicating that this tends to absorb the  injected ozone. Sea-bass in the experimental fish farm was not affected by the ozonation indicating that all harmful ozonation products (if any) were rendered harmless within minutes and before the water is returned to the fish tank.

Copper is removed along with organic matter quite efficiently. Iodine removal is very fast in seawater, whereas no removal is observed in fresh water. Colour is removed much faster than by a good sand filter. While nitrite is removed much faster by ozone than by the biofilter in seawater, the effect in freshwater is slower in the ozonated freshwater system than in the control system. 

The trout stock that was exposed to the 30 day ozonation has not shown any sign of gill damage or behavioural irregularity during the trial period. There is no any significant variation in the condition scoring indexes (weight, Fulton condition, ISI, SSI, HIS or gill condition) either.

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Brochure about the RAZone project

The RAZone brochure you can read here.

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Project results phase 2

Based on the laboratory investigations and literature study ,the design parameters for the RAZone process have been defined. These are parameters that have significant impact on the performance of the RAZone process and consequently on the system footprint. Although there are a range of factors to be considered,  the consortium has agreed to focus on 5 major parameters in the design of the RAZone prototype. These include particle size, particle-bubble attachment efficiency, residence time, bubble concentration, and bubble size. Further to this, a series of jar tests using waste water samples from Salmar. The tests revealed that the largest bulk of particles have diameters in the range of 5-15 µ. Therefore, effective management of water quality in RAS requires removal of the finest particles.  There is also a need for measurement of particle size distribution in the trials to be run. For this, 3 alternative methods are being evaluated.

Parallel with the development of the treatment process, the control system is being designed, involving development of a fully functional control software and hardware. The main control items are ozone production and dosage including potential fault and operational messages to operator cellular, reaction processes as well as logging of input and output signals.

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Pilot plant

After completing the laboratory studies by the RTDs, the RAZone system prototype has been designed and components of the pilot plant have been manufactured. Based on the discovery of the particle distribution in recirculated water from literature and laboratory investigations, the treatment system was enhanced by including a supplementary process as the processes described in the DOW were not efficient enough to remove the finest particles that make up more than 70% of the particulate substances in RAS. Integration of the  ozonation and separation units with the process control unit was accomplished at the beginning of July. The pilot unit will be integrated with the experimental RAS built at LU for preliminary trials before installation at the end user farms for field tests.

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Commissioning of the Pilot Plant

The Month 21 Consortium meeting was  held at LU on August 6 2014. During the meeting the RAZone system integrated with the marine RAS constructed for studying physiological impact of ozonation on marine stock has been demonstrated to the consortium where the functionality of the different components, cleaning effect in relation to removal of particulate substances, TOC and DOC as well as physical and chemical parameters of the recirculated water are being studied. Preliminary results have shown promising results, and the pilot plant is scheduled to be tested at AAL site starting at the beginning of October.

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Project results phase 1

Recent results include finalization of laboratory investigations for establishing the scientific basis for completing development of the RAZone innovation components and building the pilot plant at end user sites.

Further to this, laboratory trials run at TI have resulted in selection of devices that compose the ozone delivery unit. These have been subjected to functionally tests in relation to generation of microbubbles for agglomeration of fine particles and oxidation of dissolved organics that represent the main target pollutants of RAZone. A number of iterations have been made through simulation with artificially contaminated fresh water representing a pre-filtered water in RAS. Promising results have been attained from the trials in relation to technological objectives of the project. The design of the reaction chamber for the ozonation process is progressing.  After integration of the  ozone delivery unit with the reaction chamber, more trials will be run jointly by TI and Fraunhofer as a basis for any necessary modifications

Experimental studies conducted at LU in relation to generation of intermediate products of oznation have revealed formation of chlorine and bromine by-products whereas ozone itself is unstable and is rapidly removed. The investigation has also discovered application of salts that can moderate the change in redox-potential, but formation of TROs continues in spite of such measures. In addition to this, it is confirmed that valuable minerals needed for stock can be lost during ozonation.

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Project progress

The latest project results involve literature review as a basis for development of RAZone’s innovative components, investigating chemistry of ozonation and corrosive properties of ozone to different materials and developing design specifications for the flotation chamber. Results involve also setting of equipment for laboratory investigations.

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Meetings and events

Project Month 6 Meeting - May 21th -May 22nd-Board Meeting & Technical Meeting

The Month 6 meeting for the project was held in Steinkjer, Norway.

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Project Kick off Meeting - 09th January, 2013

RazOne has an official start date of December 1th, 2012. The Kick-off meeting for the project was held at Celtic Royal Hotel North Wales on January 9th . Both industrial partners and RTD partners took part of the meeting.

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