Examination of method of processing aeration to remove stink of milk cow [Bos taurus] urine sewage

On the indoor's experiment, an effective method of aeration was examined to remove the stink that became a trouble in using milk cow's urine sewage as liquid manure. (1) The urine sewage without dilution was aerated for 6 days. The pungent odor level rose oppositely though the unpleasantness level was able to be reduced. (2) The urine sewage was diluted to 5 times with tap water, and aerated for 6 days. The generation of nitrate-nitrogen can be confirmed to the middle and the high aeration treatment, and the pungent odor level has decreased. Nitrate-nitrogen is not generated, and the pungent odor level has not decreased to the low aeration treatment either. (3) In middle aeration, the urine sewage was putted into the aeration tank continuously. It was difficult to dispose continuously the urine sewage diluted to 5 times with injection of 10% amount of the aeration tank every day. However, it was easy to dispose continuously the urine sewage diluted to 10 times with injection of 20% amount of the aeration tank every day. From the facts mentioned above, the dilution was more effective than aeration for the urine sewage to remove stink of urine sewage by aeration.