To evaluate the environmental conditions of the valorization, the physical conditions (pH, dissolved oxygen, and ORP) were monitored for approximately seven days after treatment (Fig. 2). The changes in pH and dissolved oxygen in the solid wastes treated by KBM-1 were not different from those of the control (no treatment). However, overall, the ORP was lower in the KBM-1-treated group than in the control group, and thus, it was assumed that KBM-1 can induce reducing conditions in which more electron donors were generated.In the valorization of the RAS solid wastes by KBM-1, the removal of TCOD (3,420 mg/L) after KBM-1 treatment was 16% after 12 days, while that of the control was 28% (Fig. 3). Likewise, a higher removal of SCOD (1,260 mg L−1) was observed in the control (62%) compared with that of the KBM-1 treatment (48%). These results indicate that the production and maintenance of organics (sugars, fatty acids, and amino acids) in the KBM-1 treatment were better than that in the control, and these organics can be used as electron donors in the denitrification system of an RAS.During the valorization of the RAS solid wastes by KBM-1, an increased removal efficiency (14%) was shown for TN (145 mg L−1) in 12 days, while the maximal removal efficiency (8%) was observed after four days in the control (Fig. 4). An increased removal efficiency of ammonium-N (54%; 83 mg L−1 as an initial concentration) was shown 12 days after treatment, while the control had a maximal removal efficiency (7%) after eight days. It was assumed that ammonium-N was removed through the process of biological oxidation and volatilization owing to aeration. An increased removal efficiency (41%) of nitrate (NO3- - N; 22 mg L−1) was observed two days after treatment, while the maximal removal efficiency (16%) was shown in the control after four days, indicating the effectiveness of the KBM-1 treatment for nitrate removal. In this case, organic acid production and denitrification rates were high in the initial stage (two days). Nitrate seemed to be removed through the process of biological denitrification utilizing the organic acids as an electron acceptor. The valorization process can be optimized to degrade wastes and maximally produce organic acids to be used as internal electron donors for the denitrification process within an RAS.
To evaluate the environmental conditions of the valorization, the physical conditions (pH, dissolved oxygen, and ORP) were monitored for approximately seven days after treatment (Fig. 2). The changes in pH and dissolved oxygen in the solid wastes treated by KBM-1 were not different from those of the control (no treatment). However, overall, the ORP was lower in the KBM-1-treated group than in the control group, and thus, it was assumed that KBM-1 can induce reducing conditions in which more electron donors were generated.<br>In the valorization of the RAS solid wastes by KBM-1, the removal of TCOD (3,420 mg/L) after KBM-1 treatment was 16% after 12 days, while that of the control was 28% (Fig. 3). <br>Likewise, a higher removal of SCOD (1,260 mg L−1) was observed in the control (62%) compared with that of the KBM-1 treatment (48%). <br>These results indicate that the production and maintenance of organics (sugars, fatty acids, and amino acids) in the KBM-1 treatment were better than that in the control, and these organics can be used as electron donors in the denitrification system of an RAS.<br>During the valorization of the RAS solid wastes by KBM-1, an increased removal efficiency (14%) was shown for TN (145 mg L−1) in 12 days, while the maximal removal efficiency (8%) was observed after four days in the control (Fig. 4). An increased removal efficiency of ammonium-N (54%; 83 mg L−1 as an initial concentration) was shown 12 days after treatment, while the control had a maximal removal efficiency (7%) after eight days. <br>It was assumed that ammonium-N was removed through the process of biological oxidation and volatilization owing to aeration. An increased removal efficiency (41%) of nitrate (NO3- - N; 22 mg L−1) was observed two days after treatment, while the maximal removal efficiency (16%) was shown in the control after four days, indicating the effectiveness of the KBM-1 treatment for nitrate removal. <br>在這種情況下,有機酸的生產和脫氮率分別在初始階段(2天)的高。硝酸鹽似乎通過利用有機酸作為電子受體的生物反硝化的處理中除去。<br>的物價穩定措施方法可以被優化以降解廢物和最大限度產生有機酸被用作用於RAS內反硝化過程內電子給體。
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