Hebei Key Laboratory of Heavy Metal Deep-Remediation in Water and Resource Reuse; and the Laboratory of Applied Chemistry, School of Environmental and Chemical Engineering, Yanshan University, Qinhuangdao 066004, PR China.
Hebei Key Laboratory of Heavy Metal Deep-Remediation in Water and Resource Reuse; and the Laboratory of Applied Chemistry, School of Environmental and Chemical Engineering, Yanshan University, Qinhuangdao 066004, PR China.
Bioresour Technol. 2023 Sep;384:129226. doi: 10.1016/j.biortech.2023.129226. Epub 2023 Jun 2.
Copper (Cu) and zinc (Zn) in piglet feed can lead to heavy metals (HMs) accumulation in pig manure (PM). Composting is crucial for recycling biowaste and decreasing HMs bioavailability. This study aimed to investigate the impact of adding wine grape pomace (WGP) on the bioavailability of HMs during PM composting. WGP facilitated the passivation of HMs through Cytophagales and Saccharibacteria_genera_incertae_sedis which promoted the formation of humic acid (HA). Polysaccharide and aliphatic groups in HA dominated the transformation of chemical forms of HMs. Moreover, adding 60% and 40% WGP enhanced the Cu and Zn passivation effects by 47.24% and 25.82%, respectively. Polyphenol conversion rate and core bacteria were identified as key factors in affecting HMs passivation. These results offered new insights into the fate of HMs during PM composting in response to the addition of WGP, which is helpful to practical application of WGP to inactivate HMs for improving compost quality.
仔猪饲料中的铜（Cu）和锌（Zn）会导致猪粪（PM）中重金属（HMs）积累。堆肥对于回收生物废物和降低 HMs 生物利用度至关重要。本研究旨在探讨添加葡萄酒葡萄渣（WGP）对 PM 堆肥过程中 HMs 生物有效性的影响。WGP 通过 Cytophagales 和 Saccharibacteria_genera_incertae_sedis 促进腐殖酸（HA）的形成，从而使 HMs 钝化。HA 中的多糖和脂肪族基团主导了 HMs 化学形态的转化。此外，添加 60%和 40%的 WGP 分别增强了 Cu 和 Zn 的钝化效果，分别提高了 47.24%和 25.82%。多酚转化率和核心细菌被确定为影响 HMs 钝化的关键因素。这些结果为 PM 堆肥过程中 HMs 的归宿提供了新的见解，这有助于将 WGP 实际应用于钝化 HMs 以提高堆肥质量。
