As you know, potable water ...
Published by JOSE LUIS TALAVERA, PRIVATE DESALINATION CONSULTANT
As you know, potable water from wastewater is not permitted in the most of the countries.
Agriculture or Industrial use are very common in Spain and specially in the Canary Islands.
This is my experience after installing and operating several tertiaries.
First thing to consider as usual, is the quality of the treated wastewater and the target quality.
There are two points to consider: For granular filtration, the best choice is the up flow, continuous backwash type (Dynasand, Dualsand and other brands) because their efficiency is much higher than standard ones and remove phosphates, which is very important if a desalination stage is needed, to avoid a big expense of acid to eliminate the formation of calcium phosphate scaling.
If desalination is needed, do not use Reverse Osmosis, but Electrodialysis Reversal (EDR) due to the high level of dissolved organics present in the feed water.
Reverse osmosis get fouled very rapidly, needing a very high CIP frequency, which makes the operation anti economical and a nightmare for the operator. (Some RO Plants have been shut down or transformed in Electrodialysis due to the high cost of the produced water)
The big advantage of EDR versus RO is due to two main factors.
EDR can work with chlorinated water and is not a filter like RO (Product water do not pass through the membrane)
Resuming:
If desalination is not needed, use "Dynasand" type filter alone or "Dynasand" followed by MF or UF stage depending on the water quality. (Do not make the big mistake of using MF or UF without the previous "Dynasand" type filter stage).
If desalination is needed, the design must be:
"Dynasand" type filter, followed by MF-UF, followed by Cartridge Filters and finally Electrodialysis Reversal (EDR)
1 Comment
Bonjour
Je suis désolé mais dans votre présentation vous ne proposez aucune méthode d'épuration et de purification.
La filtration n'est pas une méthode d'épuration des eaux usées et encore moins de purification.
Et ce qui est encore plus grave c'est que dans votre post on ne voit nulle trace d'un quelconque lien à la caractéristique -biologique- des eaux usées.
La majorité des eaux usées perdent ou on perdue les caractéristiques biologiques nécessaires voir même indipensable à un éventuel recyclage immédiat d'arrosage de la biodiversité et encore agronomique
Toutes les pollutions dissoutes, invisibles seront transmises au plant et on les retrouvera automatiquement dans nos assiettes.
Il faut des années à MERE NATURE pour faire une eau potable, comment l'homme ose t il vouloir faire mieux qu'elle avec sa technique.?
Hello I'm sorry but in your presentation you are proposing no method of cleansing and purification.
Filtration is not a method of purification of sewage and even less of purification.
And what is even more serious is that in your post there is no trace of a any link to the - organic - characteristic of wastewater.
The majority of wastewater lose or we lost the necessary biological features see same proficiency in any immediate irrigation of biodiversity and even agricultural recycling all impurities dissolved, invisible will be transmitted to the plant and we'll automatically find them on our plates.
It takes years for mother NATURE to make drinking water, how man can t he want to do better with his technique.?