Chlorine dioxide disinfection technology to avoid bromate formation in desalinated seawater in potable waterworks

by E. Danesi, G. Petrucci, M. Belluati and M. Rosellini
Desalination 203 (2007) 312-318

Abstract

Throughout the world consumers demand is expanding for a higher level of water quality and quantity. The source of water greatly varies from country to country and in some areas desalination of seawater is the dominant process for potable water. Desalination is a process that removes dissolved minerals (including but not limited to salt) from seawater, brackish water, or treated wastewater. A number of technologies have been developed for desalination, but, in the end, pure desalinated water is acidic and is thus corrosive to pipes, so it has to be mixed with other sources of water that are piped on-site or else adjusted for pH, hardness, alkalinity and disinfectant residuals before being piped off-site to comply with potable water regulation.

Authors

M. Rosellini (1), E. Danesi (1), M. Belluati (1), G. Petrucci (1)

Tags

Potable water ()
... and quantity. The source of water greatly varies from country to country and in some areas desalination of seawater is the dominant process for potable water. Desalination is a process that removes dissolved minerals (including but not limited to salt) from seawater, brackish water, or treate ...

Chlorine dioxide (1)
Bromate is an increasing public health problem in some parts of the world where potable water is produced from salty sources. The use of chlorine dioxide is very promising to solve this problem and to increase the quality of the distributed water. It has been confirmed, both in th ...

Bromate (3)
... site or else adjusted for pH, hardness, alkalinity and disinfectant residuals before being piped off-site to comply with potable water regulation. Bromate is an increasing public health problem in some parts of the world where potable water is produced from salty sources. The use of chlorine dioxid ...

Desalination (208)
... is expanding for a higher level of water quality and quantity. The source of water greatly varies from country to country and in some areas desalination of seawater is the dominant process for potable water. Desalination is a process that removes dissolved minerals (including but not limited t ...

Conclusion

Bromate is an increasing public health problem in some parts of the world where potable water is produced from salty sources. The use of chlorine dioxide is very promising to solve this problem and to increase the quality of the distributed water. It has been confirmed, both in the laboratory and in industrial practice, that this powerful disinfectant/oxidant is very stable during time in the pipes and, consequently, the formation of chlorite is very low and well under the WHO guideline value. Chlorate can be minimized adopting new production technology able to form highly pure chlorine dioxide solutions. Chlorine dioxide, in the conditions usually encountered in potable water production from salty sources, does not oxidize bromide and, consequently, no formation of bromate can be detected with this chemical. In addition, it is well known that chlorine dioxide does not produce TTHMs and, in comparison with chlorine or hypochlorite solutions, decreases dramatically the AOX content.


Source: http://www.desline.com/articoli/8044.pdf


Lenntech BV

Rotterdamseweg 402 M
2629 HH Delft
The Netherlands

tel: +31 15 261 09 00

fax: +31 15 261 62 89

e-mail: info@lenntech.com











Bookmark and Share