Performance of aerobic granular sludge for piggery wastewater treatment and its Cu2+ and Zn2+ removal mechanism

作者：Xiaochun Wang, Shutao Xiao, Mingyang Li, Biming Wang, Xiangtong Zhou, Yun Zhou, Zhonglin Chen, Xiaolei Zhang · 发表于：Applied Microbiology and Biotechnology · 年份：2025 · DOI：10.1007/s00253-025-13611-1 · 被引用次数：3 · 研究领域：Wastewater Treatment and Nitrogen Removal、Constructed Wetlands for Wastewater Treatment、Adsorption and biosorption for pollutant removal

With rapid economic development, the demand for livestock and poultry products has increased. By the end of 2021, China’s pig population reached 449.22 million, corresponding to the production of a large amount of piggery wastewater (source: https://www.chinairn.com/hyzx/20220607/160227765.shtml ). During the breeding process, antibiotics and heavy metal elements such as Cu 2+ and Zn 2+ are mandatorily added to commercial feeds to promote pig growth and prevent disease (Cao et al. 2018 ; Li et al. 2020a , b ). However, due to their extremely low assimilation rates (typically < 10% for Cu and < 15% for Zn in pig metabolism), over 90% of these additives are excreted into wastewater (Zhang et al. 2020 ). For instance, monitoring data from Chinese pig farms indicate that Cu 2 ⁺ and Zn 2 ⁺ concentrations in pig manure range from 988 to 1027 mg/kg and 1514 to 418 mg/kg, respectively (Shi et al. 2011a , b ; Song et al. 2018 ), far exceeding the levels of other heavy metals. It is worth noting that when such high-concentration heavy metals enter receiving water bodies with flushing wastewater from breeding farms, their dissolved Cu 2 ⁺ and Zn 2 ⁺ concentrations can reach 50–300 mg/L (converted by sewage volume), far exceeding the limits specified in China’s “Pollutant Discharge Standards for Urban Sewage Treatment Plants” (Cu 2 ⁺, 0.5 mg/L; Zn 2 ⁺, 1.0 mg/L). If discharged without effective treatment, they will accumulate through the food chain, causing acute toxic effects and posing...