Dear Mohammed, As most ...
Published by Orlando D. Gutiérrez Coronado
Dear Mohammed,
As most of the disinfection experts agree with my opinion about ozone disinfectionn properties, I will explain some advantages in ozone use.
The ozone is really the most effective disinfectant that you can use to kill bacteria, eliminate visuses, theid ADN, and even can transform them into CO2 and water. Aas you can look for it (or google it), the Contact Tables have data that compare the ozone, and the chlorine.
A good disinfection example explained in those Contact Tables is the inactivation of Giardia Cyst by free Cholrine for a 3 log at pH = 7, 10 Celsius degree, the free chlorine concentration value will be 137 ppm to disinfect in 1 contact time. To disinfect with ozone at the same values is just 1,43 ppm, 93 times less!
On te other hand, Cotact time (CT) Values for 4 logs Inactivation of Viruses by chlorine is 6 ppm and for Ozone is just 1 ppm.
The ozone have 3 important parameters to have into account in the disinfection design:
1) Ozone dose in the water to reach the concentration on the liquid stream (water): it will depend on the ozone consumption in that water, and the disponible contact time to reach the desired disinfection.
2) Concentration on the gas stream (ozone): the ozone concentration in the gas stream is importand due to it is related with the quantity of ozone that can be dissolved in that water. If you have a poor ozone generator that gives a low concentration in that gas stream (less than 3 % w/w) you could not dissolve enought ozone in that water and will need a bigger ozone generator to disinfect the same water. If you have a good ozone generator with a hihger ozone concentration (over the 5% w/w) you could have a small ozone generator due to you can dissolve more ozone in that water.
3) Dissolving technology: The dissolving technology have an important role. Of course if you use a poor inefficient dissolving system (as bubbling system) as somebudy suggest, you will be wasting your money and time with this system due to you will not be dissolving enought ozone. If you use at least venturi type injectors instead of bubbling system you could use a simple and really economic system that dissolve and suspend gas microbubbles in that system reaching a better concentration in that water.
Maybe somebody not informed and that does not understand that the ozone can dissolve in water could suggest that the ozone gas can not be dissolved in water, but you can easily google for it and understand that no all the thinks that some experts express are really true, and htat the ozone dissolves in water.
Using this kind of ozone system you must not use high pressure systems that use too much energy pressuring the complete water to disinfect all of it.
Always try to compare the comparable.
Regards,
Orlando D. Gutiérrez Coronado
1 Comment
Water treatment with ozone is wonderful where the local economy has the money to support it, but with virtually all technologies in common use this is not for the poor of the developing world. In 2015, in the public health journal Elsevier, decision-makers in the effort to get safe drinking water to the poor acknowledged that of all technologies assessed for viability in this effort, only boiling had achieved scale. And yet, from the inception of this effort boiling was negated as a possible technology because the poor could not afford it.
Ozone water treatment should not be singled out as not being viable, but as with the other technologies in common use the poor will only have the benefit of this through substantial subsidy. Even given such subsidy however, there will be a real question as to the sponsors’ commitment to a prolonged period of monitoring and evaluation.
Even so, such projects are bound to be few and far between and ultimately those deciding on such goals as those of 2030 will feel compelled to extend these to 2040 or 2050. The only alternative is for the decision makers to take bold steps in seeking out genuinely sustainable technologies of water treatment, not waiting for the technologies to come to them.
Published by Anthony Reid Harvey
1 Comment
Dear Anthony,
I agree with you, the ozone havemany advantages over other technologies, and at the same time must be used with some engineering criteria.
Can be used for poor people? Yes
Can be used in isolated zones? Yes
Can be used in small scale or individual homes? Yes
Is ozone more effective killing bacteria and elimating viruses than other disinfectants? Yes
Need some training to use? Yes
Has the local economy, money to support ozone disinfection system? Sometimes
There are many ways to disinfect from thermal methods as boiling to chemical adition methods as ozone, peroxide, and chlorine, and to find the best option we need to do a very good technical and cost-effective analysis.
Sometimes the boiling could be the best, in other cases ozone can be, in other casess a mix of them as the use of filtration followed by ozonation, but even always the decision-maker, his team and their knowkedge will influence the final decision.
That is the reason to adquire more knowledge in water disinfection, and not in limiting to the actual more known technologies.
Thanks to Mohammed to ask about it!
Regards,
Orlando D. Gutiérrez Coronado
Published by Orlando D. Gutiérrez Coronado