The problem of large amounts of high-salt wastewater
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Is there any common treatment method available for large amounts of highly saline wastewater (with a salt concentration of 30,000 mg/L) at low temperatures?
Regarding the issue of high-salt wastewater mentioned by the poster, there is currently no effective solution for dealing with it; companies that have the necessary resources usually employ evaporation desalination, treating the salt as solid waste.
How low is the temperature? If it’s low enough, use cryogenic crystallization; however, there are issues with large quantities.
It’s basically at room temperature. Also, have there been any successful cases of cultivating salt-tolerant bacteria recently?
I have been working in this field. It is feasible to use biological methods for treating highly saline microbial strains, but they cannot be effective for wastewater at all salt concentrations; specific issues need to be analyzed on a case-by-case basis. However, wastewater with a salinity of 3% is still feasible.
Currently, we generally dilute this kind of wastewater to 1% before treating it!
With such high salinity levels, it’s quite difficult to use biological treatment; saying it’s impossible might be an extreme statement, but the effectiveness of biological treatment will certainly be poor. Multi-phase evaporation should be a better treatment method.
There is simply no good solution for large volumes of highly saline wastewater; anyone who claims to have one is lying. It’s not that the technology is inadequate; it’s the high investment and costs.
I’ve heard that people have already developed organisms capable of surviving 10% salt concentration, but it’s not clear whether this can be achieved on an industrial scale.
For 11# zqs2815, which involves a large volume of wastewater – thousands of tons per day – what kind of evaporation equipment should be used? Not to mention using multiple sets of equipment in parallel – each one costs several million; who can afford that? Not to mention the operating costs of water. Engineering is not just about technology; economics must also be taken into account!