Abstract
Tetracycline antibiotics (TCs) are a common type of antibiotic found in swine wastewater. Oxytetracycline (OTC) is a significant type of TC. This study mainly examined the influence of OTC on high-temperature anaerobic digestion by adding OTC to collections of swine wastewater at different times during the digestion process. The results showed that high-temperature anaerobic digestion was suitable for the removal of TCs, with an 87% OTC removal efficiency achieved by day 20. Additionally, OTC added from external sources was found to inhibit the chlortetracycline degradation process and affect the first-order degradation kinetic model of TCs. Complexation reactions were the main ways in which OTC affected the heavy metal content of the water. The exogenous addition of OTC was found to inhibit the activity of some digester microbial strains, reduce the proportion of dominant strains, such as MBA03, and kill certain specific strains. This performance alteration was most obvious when OTC was added in the middle of the reaction.
Highlights
In 2018, there were 790.5 million pigs in the whole world, and global pork production was about 118.8 million tons [1]
This study focused on the effect of OTC addition in high-temperature anaerobic digestion (55 ◦ C) and the interactions between Tetracycline antibiotics (TCs), heavy metals, and the microbial community, aiming at providing a theoretical basis for the study of high-temperature anaerobic digestion of TCs
The results demonstrated that high-temperature anaerobic digestion had a positive effect on the degradation of tetracycline antibiotics
Summary
In 2018, there were 790.5 million pigs in the whole world, and global pork production was about 118.8 million tons [1]. Swine wastewater has been one of the most widely distributed pollution sources globally, and the discharge of pig wastewater has increased gradually over recent years. A previous study estimated that each pig farm in China produces approximately 1300 m3 of pig wastewater each year [3]. In South Korea, swine wastewater accounted for approximately. The livestock and poultry industries consume more than 84,000 tons of veterinary antibiotics every year in China, and about 58% of these are directly or indirectly discharged into the natural environment [5]. It is estimated that from 2010 to 2030, global antibiotic use will increase by 67%. In Brazil, Russia, India, China, and South Africa, the rate of usage is expected to double [6]
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