Treatment of ammonia-vapored wastewater
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My coking plant has carried out a series of modifications to its water treatment system; it is planned to treat the ammonia-vaporizing wastewater separately before sending it to the sewage treatment plant for biological treatment. The parameters are: COD of 6000, ammonia nitrogen of 200, volatile phenols of 1000, and oil content of 50. Is there any way to reduce volatile phenols so that they can be used directly in biochemical processes? Or it can be processed by other means to enable biodegradation.
Pre-treatment to concentrate and remove ammonia. . . . . .
Should ammonia nitrogen be removed first before dealing with the rest?
Based on the data, there is no issue with proceeding with biochemical treatment; the A2/O process is fully capable of meeting the requirements. Phenols will be degraded after hydrolysis and acidification, and the A/O process can still ensure the removal of 200 units of ammonia nitrogen. Either SBR or CASS can be used.
It is now being fed into the biochemical treatment process using the OAO technology; the designed daily processing capacity is 7,200, but at present the amount fed in is just over 5,000. Essentially, the water is diluted by half before being sent to the biochemical treatment stage. I want to treat this water now before sending it to the biological treatment process, in order to reduce the load on that system; moreover, advanced treatment will be necessary later on
Phenol can’t be that high, right? Was there a mistake in the measurements? There’s no such high level of phenol in coking plants; such high levels can’t be processed through biological wastewater treatment
There’s nothing wrong with the anaerobic tower on VOC. Send me a private message.
Please pay attention to the more important data, namely the levels of sulfides and total nitrogen. It is estimated that this water needs to be diluted, with a large proportion of it being recycled; ideally, a complete mixing method should be used for treatment. The biochemical test results are expected to show COD at 200, with ammonia levels within the acceptable range.
Brother Monkey, you’re here again? Please take a look at my series of posts: Chemical Engineering in Daily Life – Questions 1 – 66.
The ammonia-vaporizing wastewater resulting from the ammonia vaporization tower after treating the remaining ammonia water contains volatile phenols, sometimes at levels of 1200–1300
As mentioned above, diluting such water by half before feeding it into the biological treatment system should not pose any problems. When the COD level is over 6000, the volatile phenols level is usually between 1000 and 1300, and this is also the case for us. It is merely due to the coal quality and coking processes that the composition of water inside is complex, which affects the stability of ammonia nitrogen treatment efficiency. The situation varies from factory to factory, so it’s difficult to guarantee anything