இரசாயன பொறியியல் மற்றும் செயல்முறை தொழில்நுட்ப இதழ்
திறந்த அணுகல்

சுருக்கம்

Effect of pH Control Strategy on Anaerobic Fermentation of Oxytetracycline Excess Sludge

Yunxia Wang, Hong Liu, Zhiqiang Tang, Qi Wang, Li Zhang, Yongzhi Chen*

The high cost of treating Oxytetracycline (OTC) sludge poses a significant risk of secondary pollution, emphasizing the need efficient, eco-friendly, and safe methods. In this study, OTC-containing excess sludge was subjected to continuous pH adjustments to levels of 5, 8, 10, and 12, as well as intermittent regulation to pH 10 and 12 at a temperature of 35 ± 3°C. Notably, intermittent pH regulation was found to be more effective in producing Short-Chain Fatty Acids (SCFAs) compared to continuous regulation at pH 10. The maximum production of SCFAs reached was 1590.5 mg Chemical Oxygen Demand (COD)/g Volatile Suspended Solids (VSS), with acetic acid comprising 82% of the total SCFAs. Additionally, a sludge reduction of 33.1% was achieved. The concentration of the emitted OTC was 22.58 mg/L under intermittent pH regulation was comparable with 18.5 mg/L under continuous pH regulation, while the removal rate of OTC was 62.5% in OTC-containing excess sludge anaerobic fermentation. The qualitative analysis by mass spectrometry revealed that the main metabolites such as 4-Epi-Oxytetracycline (EOTC) and alpha-apo-Oxytetracycline (α-apo-OTC) were formed. The intermittent regulation of pH proved more conducive to the enrichment of hydrolytic acidifying bacteria (Bacillus (29.94%), Hydrotalea (4.32%) and Thauera (13.67%)). Moreover, Pseudomonas (1.56%) demonstrated remarkable efficiency in degrading OTC.