Ask for experience in debugging aerated biological filters
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The company has a new set of aerated biological filters, AF+BAF. After more than a month of debugging, now the AF can basically meet the hydrolysis requirements, and the DO is at 0.2. The sludge has also turned black. However, the BAF has never been coated with film, and there is no sludge when taking out the filter material. There is not much sludge when discharging the sludge. I personally think that the sludge has been lost. I have added sludge four times now. I am very anxious. Please give me some opinions from experts. The incoming water is biochemically treated methylamine wastewater. The COD is around 250 and the ammonia nitrogen is around 10. Is it because the microorganisms have nothing to eat? The DO of BAF is around 3.0.
The COD value during debugging is too low. The COD entering the BAF is controlled at around 600, the DO is at 2-3, and the temperature is at 15-30 degrees. It should be resolved within 10-20 days of debugging.
In that case we will need to add additional carbon sources. The current temperature is no problem, and DO is controlled at around 3.0. But there is no sludge in BAF, and the water is so clear that it has been filtered by the filter material. We have been debugging for more than a month. I would like to ask, some people say that film can be hung without adding sludge. Is this feasible?
It is recommended to measure the BOD5 of BAF inlet water. Be careful when adding carbon sources. It's okay to add some sludge appropriately. It is best to monitor the COD and PH of the incoming water every day. Be patient.
We are now adding sludge all the time, and then turning on one-hour aeration every eight hours to force the film to hang.
Bacterial growth requires a good environment: Temperature 25-30 PH value 8-8.5 COD greater than 500 Phosphate and nitrogen fertilizers should be added in proportion, aeration should be provided regularly and the water should be gentle and the water quality and quantity should be stable.