The issue of recycling wastewater from stripping towers
Thread Content
Let’s discuss where the wastewater from the stripping tower goes. Does anyone know what harmful components are present in that wastewater?
I’m not sure, but it seems to be capable of causing cancer
There is already a related post on the forum; it’s recommended to give it a search! Generally, it is sent to wastewater treatment plants or used in gasification units as water for coal grinding!
Our company is involved in the subsequent wastewater treatment. Some of the key parameters include CODcr, BOD5, SS, PH, sulfides, volatile phenols, and petroleum compounds. This is part of the discharge water standards. Hope this helps.
Can it be used as raw water at the brine treatment station? What impact does it have on the mixed-bed?
Removing saltwater is way too inappropriate, isn’t it? With these ingredients and quality, it’s not even as good as water drawn straight from rivers! Firstly: Turbidity – there are quite a lot of impurities present, and it’s possible that these are particles formed as a result of the reaction between iron and methanol. Color: It’s somewhat black; it’s not clear what causes this color. Odor: It has a very unpleasant smell, which indicates that there are quite a number of impurities present. Impurities: There’s a significant amount of ethanol, along with other organic compounds; all of these need to be removed. Additionally, certain ionic components also need to be eliminated. Therefore, this water is not suitable as raw material for desalination
What’s produced by our unit is sent for distillation to carry out heat exchange with the feed, and then it is sent to the circulating water system.
Reply to 7# aiaiqiuqiu: Then the temperature in your unit after passing through the distillation and pressurization tower as well as the feed heat exchange unit should be above 80 degrees, right? Does the fluid go into the circulation tank, or does it return to the main return pipe and then pass through the cooling tower before reaching the tank? Was no other heat exchanger (such as a water cooler) added after the distillation preheater? Going directly into the circulating water shouldn’t cause any problems, right?
Reply to 6# wawjia: We have also considered what the moderator mentioned. First, the design firm’s plan was to eliminate the brine treatment station; we have conducted analyses and found that levels of turbidity, iron ions, ethanol, silica, and other substances are very low – several times lower than those in the raw water. However, the pH level is high, as it is due to steam-cooled condensate, resulting in a pH that is much higher than that of the raw water. It is currently around 10. After feeding this water into the mixed-bed resin unit in the brine treatment station, we observed that the regeneration cycle of the mixed bed was shortened; we are not sure what causes this.
Reply to 8# wwg: Our condensate exits the stripping tower and then exchanges heat with the condensate heat exchanger. After that, it is sent to the feed heat exchangers of the rectification pre-tower and the pressure tower. Subsequently, it is taken to the deoxygenation station where it exchanges heat with the heating water heat exchanger and the condensate heat exchanger. Finally, it is sent to exchange heat with the desalinated water feedwater; the condensate after this heat exchange process is sent to the circulating water return main pipe. So far, no major problems have been encountered, but during the hot summer months, circulating water cooling poses a problem; the temperature of the condensate is also high, and feeding it into the circulating water system may cause its temperature to rise further.
There are many misunderstandings. In fact, what was mentioned above refers to the transfer of condensate to the desalination station and the use of circulating water for makeup water – these are all standard practices. In reality, it is also possible to send the liquid directly to the boiler deaerator without cooling first, thereby reducing the amount of steam required for operation of the deaerator. But this question makes one think about where it would be more appropriate to send the wastewater from the recovery tower; this water can only be used for coal grinding or in sewage treatment plants, and it cannot replace the water used in distillation processes.