Questions about Aquitain’s HERO technology
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According to the documentation on the HERO technology in Aquit Technologies, reverse osmosis membranes are capable of withstanding high levels of COD; they can operate normally even when the COD level reaches several hundred mg/L without forming scale. However, many RO membranes struggle to cope with high levels of organic pollutants. I am skeptical about the claim that the HERO technology can handle such high COD levels. I’ve heard that a factory in Hebei has installed a HERO technology system; if anyone who is familiar with the actual application of this technology is reading this, I would appreciate it if they could share some insights. Thank you
I don’t know; I’m also looking forward to experts providing an answer
I’ve seen it, but it’s not for sewage. Mainly, lime is added to increase hardness.
The membrane used is not a regular RO membrane; it has wider channels and greater resistance to contamination. However, its hardness poses problems related to scaling and recovery efficiency.
Hundreds of COD? (Even if B/C=0.15, the BOD can still be in the tens!) ) Don’t bacteria grow on the membrane surface under such conditions? ? ?
The last edit to this post was made by fanzhengzero on 2010-6-12 at 21:35. The key to HERO is to remove alkalinity: first, carbon dioxide must be added to convert all the hardness in the water into carbon dioxide hardness； Then alkali is added to make the alkalinity in the water just higher than the hardness, so that all the hardness in the water exists in the form of bicarbonates; thereafter, weakly basic resin is used to remove the hardness (taking advantage of the high removal efficiency of weakly acidic resins for bicarbonates) ； After passing through the decarburizer, alkali is added to adjust the pH to 9–10, and then the mixture is fed into the RO system (a high pH level is effective for removing silicon and anions, and it also helps to achieve self-cleaning of the RO membrane). Personally, I think the membranes they use are probably quite special as well – perhaps with wider flow channels and better resistance to contamination. It’s a shame I’ve never seen any examples of this; I’ll definitely conduct some experiments if I get the chance
At high pH levels, due to the change in the electrical charge of the membrane surface (which becomes negative), and since most organic pollutants are also negatively charged, these pollutants do not easily contaminate the membrane under electrostatic forces.