Journal of Animal Environmental Science ISSN:1226-0274(Print) 축산시설환경학회지

In this study, changes in physicochemical characteristics and maturity degree of anaerobic digestate were evaluated according to aeration volume and treatment period. Changes in physicochemical characteristics of the treatment A (1 L-air/min) showed pH (7.02→7.52), EC (29.93→22.12 mS/cm), ORP (200.10→164.30 mV), COD_Mn (661.98→629.43 mg/L), and BOD₅ (264.90→6.31 mg/L), and TN (0.27→0.23%), P₂O₅ (0.004→0.002%), K₂O (0.25→0.29%), TN+P₂O₅+K₂O (0.52→0.51%), NH₄-N (2,278.86→1,984.44 mg/L), NO₃-N (142.42→120.86 mg/L), NaCl (0.43→0.41%), CaO (150.40→132.11 mg/L), B₂O₃ (25.54→ 13.01 mg/L) and Fe (42.89→29.42 mg/L). The treatment B (2 L-air/min) changes in these parameters were similar as well as A treatment. Results of evaluating the maturity level of Cont., A and B treatments using the mechanical maturity method and germination index method were all semi-mature and immature from day 0 to 7, and the germination index method was both “0”. Mechanical maturity of treatment A after 21 days (semi-mature → mature). In addition, after 14 days, treatment B was received as (semi-mature → mature), but in the case of the germination index method, all samples did not meet the 70 standard.