Effects of Lighter Dose of Oxytetracycline on the Accumulation and Degradation of Volatile Fatty Acids in the Process of Thermophilic Anaerobic Digestion of Swine Manure

Oxytetracycline (OTC) is a commonly used antibiotic in livestock farming for controlling intestinal and respiratory infections farm animals. However, the absorption of antibiotics by animals limited, most are excreted original form with manure, which will have an impact on environment. The removal from swine manure could generally be performed via anaerobic digestion (AD). In this study, effect oxytetracycline at doses 0.1, 0.5, 1.0 mg/L thermophilic (55 °C) batch digesters was studied. methane production, volatile fatty acid (VFA) levels, dissolved organic matter (DOM) were determined compared control (0 OTC). results indicate that (1) OTC 0.1 had no inhibitory production or accumulation VFAs, while 0.5 inhibited inhibition rates 4.03% 14.12% (p < 0.05), respectively; (2) VFAs each reactor peaked first day reaction, as dose increased 0 to mg/L, maximum VFA 1346.94 mg/g 2370 solids (VS); (3) (0.5 mg/L) promote temporary propionic acid, did, however, not result significant accumulation. Further, can DOM therefore,