Start-up of demoplant for optimization of chemical precipitation

Reference number
Coordinator Flocell AB - Flocell
Funding from Vinnova SEK 300 000
Project duration March 2017 - March 2018
Status Completed
Venture Innovative Startups
Call Innovativa startups fas 1 Våren 2017

Purpose and goal

Flocell has run a pilot-plant for in situ polymerization of aluminum-based coagulants at Karlskrona waterworks. The raw water is taken from Lyckebyån - one of Sweden´s most contaminated and hard-treated surface waters. The test run has given continuous data through on-line analyses of turbidity and colour in raw and trested water. The data show that Al-dose and basicity must be dynamically regulated to achieve optimal purification results and lowest operating costs. The data also forms the basis for the development of an adaptive control system.

Expected results and effects

The project has verified that dynamic control of both Al dose and basicity results in better purification results and lower operating costs. Dynamic control is possible by adjusting basicity in situ. Two controllable parameters are obtained instead of conventional control where only the Al dose is regulated. The process control developed during the project includes e.g. an adaptive system where the critical contamination parameters, flow, temperature and pH of the work are measured online and stored.

Planned approach and implementation

Flocell used, in the tests. a container-based facility for in situ polymerization of Al-coagulant For the experiments, Karlskrona waterworks were chosen, where the raw water source (Lyckebyån) is one of Sweden´s most contaminated surface waters. On-line measurement of turbidity and absorbance at 254 nanometres in raw and treated water was used for data logging and control of Al dose and basicity. Measurements as the basis for the development of an adaptive control system. Al-sulfate and AlCl3 have been combined with Ca-Mg hydroxide during polymerization.

External links

The project description has been provided by the project members themselves and the text has not been looked at by our editors.

Last updated 21 January 2019

Reference number 2017-00150

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