Beijing Key Laboratory of Farmland Soil Pollution Prevention and Remediation, College of Resources and Environmental Science, China Agricultural University, Beijing 100193, China.
Beijing Key Laboratory of Farmland Soil Pollution Prevention and Remediation, College of Resources and Environmental Science, China Agricultural University, Beijing 100193, China.
Sci Total Environ. 2022 Aug 25;836:155727. doi: 10.1016/j.scitotenv.2022.155727. Epub 2022 May 4.
This study investigated the effects of the combination of phosphogypsum with calcium oxide (PPG + CaO), superphosphate with calcium oxide (SSP + CaO) and zeolite (Zeolite) on composting maturity and heavy metal passivation in pig manure composting. The results showed that all treatments reached the maturity requirements and the phosphorus-containing additive treatments had higher final germination indices (GIs). Compared with CK, additive treatments enhanced the compost maturity by promoting volatile fatty acids (VFAs) decomposition (26.4%-30.5%) and formation of stable humus substances. All additive amendment treatments increased humic acid-like substances by over 20%, and the PPG + CaO treatment had the highest level of humus. Composting process reduced the bioavailability of Cu (49.2%), Cd (5.0%), Cr (54.3%), and Pb (26.6%). Correlation analysis found that the heavy mental passivation rate was significantly negatively correlated with the contents of VFAs and nitrogenous substances, and positively correlated with the pH, GI, humic acid content and the ratio of humic acid to fulvic acid (HA/FA). Therefore, the PPG + CaO treatment further increased the passivation rates of Cu (65.6%), Cd (21.7%), and Pb (48.7%) and decreased the mobilization of Zn by promoting maturity and humification during composting.
本研究探讨了磷石膏与氧化钙（PPG+CaO）、过磷酸钙与氧化钙（SSP+CaO）和沸石（Zeolite）组合对猪粪堆肥腐熟度和重金属钝化的影响。结果表明，所有处理均达到腐熟要求，含磷添加剂处理的最终发芽指数（GI）更高。与 CK 相比，添加剂处理通过促进挥发性脂肪酸（VFAs）分解（26.4%-30.5%）和稳定腐殖质物质的形成来提高堆肥腐熟度。所有添加剂处理均使类胡敏酸物质增加超过 20%，而 PPG+CaO 处理的腐殖质含量最高。堆肥过程降低了 Cu（49.2%）、Cd（5.0%）、Cr（54.3%）和 Pb（26.6%）的生物有效性。相关性分析发现，重金属钝化率与 VFAs 和含氮物质含量呈显著负相关，与 pH、GI、胡敏酸含量和胡敏酸与富里酸的比值（HA/FA）呈显著正相关。因此，PPG+CaO 处理通过促进堆肥过程中的腐熟和腐殖化，进一步提高了 Cu（65.6%）、Cd（21.7%）和 Pb（48.7%）的钝化率，降低了 Zn 的迁移率。
