Recycled brine tank
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This post was last edited by sunjl1981 on 2013-1-6 at 23:46. In the brine recycling section, the brine discharged from the chelating resin tower, as well as the water used for cleaning and backwashing, all go to the brine recovery tank. I don’t know much about this equipment, so I hope everyone can offer some guidance. What is its approximate capacity (150,000 tons per year)? Is there an appropriate size for it, and what is the basis for that? # ， ， &
The original poster has already provided the answer: the brine recovery tank is used to store these substances. Usually, after resin regeneration is complete, they need to be pumped away, so its volume can be calculated by multiplying the actual amount by 1.25
It is best to use two tanks: one for the acid-base regeneration solution, which facilitates adjustment of neutrality, and another for the recyclable liquid that can be discharged directly. The tanks do not need to be very large; the choice of tank varies depending on the type of electrolyzer.
The wastewater generated during the regeneration of the secondary brine resin column is typically handled using two storage tanks. One of these is a tank for storing the wastewater from regeneration; it is used to collect the wastewater resulting from steps 1, 2, 6, and 7 of the regeneration process. The wastewater in this tank is sent to the process for converting it back into primary brine. Its volume can be equal to the total volume of wastewater generated during these four regeneration steps, or it can be smaller, as pumps can be used at any time to transfer the wastewater to the primary brine system； The other one is the regenerated wastewater tank: it is generally used to collect the wastewater generated in the third, fourth, and fifth regeneration steps. This wastewater contains heavy metal ions that have been displaced from the resin, and it is not suitable for salt recovery. Moreover, before this wastewater can be discharged in compliance with regulations, its pH level must be adjusted to between 6 and 9. Additionally, after the resin column has been in operation for a certain period of time, it needs to be regenerated using an increased amount of regenerating acid – that is, the resin is washed twice with acid at normal concentration to completely displace the metal ions adsorbed by it. Therefore, the volume required for this regenerated wastewater tank is: (flow rate in step 3 × 2 + flow rates in steps 4 and 5) × (1.1–1.2).
Thank you for your advice. I am now considering using a wastewater tank instead of a wastewater container; I’m not sure what the disadvantages of that would be. I plan to use a submersible pump. I’m not able to give a rating yet; I’m sorry.
It is better not to use submersible pumps, as they are difficult to repair if something goes wrong with them; it is recommended to use centrifugal pumps instead.
Centrifugal pumps have issues related to the installation height. My wastewater tank is 5.2 meters deep – can the pump draw water from there? Will I have to fill it with water every time? What are the performance parameters of submersible pumps? Could you provide more specific details? For centrifugal pumps, it’s necessary to consider placing the pump underground...