How to desalt glyphosate wastewater
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How to desalt glyphosate wastewater. Last edited by sccj504 on 2008-4-30 07:20]
The salt content in bis(glyphosate) wastewater is quite high, at 15–25%; what might be the effect of using electrodialysis? Using membrane treatment should work, but the cost of treatment is high.
Diglyphosate from different manufacturers varies; using membrane concentration, it can generally be concentrated to over 7%. However, some manufacturers’ products will have crystals precipitate. The concentrated solution can be fed back into the previous process stage.
Our company uses the macroporous resin adsorption method to adsorb over 99% of the bisphosphonate standard, at a capacity of around 10 BV. However, when treating wastewater, the salt content is very high; so how can salt be removed?
Chemical precipitation might be more reasonable; selecting an appropriate precipitation process requires experimental verification of the process conditions and yield.
After chemical precipitation is used to treat glyphosate wastewater, glyphosate cannot be recovered – isn’t that a waste? The membrane method can be used to concentrate the solution to a certain degree, but what should be done with the large amount of salt contained in the concentrated solution? It’s impossible to reuse water without desalination, right? The cost issue of using electrodialysis for desalination needs to be considered, and the issue of membrane selection also requires further study. The best approach is to improve the process for desalination during production, which requires a lot of experimental research.
Precipitation is not a viable option. Even without considering whether precipitation is possible or not, the amount of reagent required to precipitate 15–20% NaCl is such that the associated costs are unaffordable. It’s better to use the membrane method: first recover bisphosphonate, then evaporate the resulting dilute solution, and finally purify the salt obtained after evaporation. At present, our company is in the stage of salt purification
Treatment of glyphosate wastewater: The wastewater is first pre-treated, then subjected to anaerobic treatment, followed by advanced biochemical treatment involving hydrolysis and acidification. After that, aerobic biochemical treatment is carried out, and finally the water is filtered before being discharged.
The common treatment method used in traditional processes at present is to first carry out chemical destruction, then use evaporation to remove the water, purify the remaining waste salt, and subsequently treat the evaporated water through biological processes