不同改性金属盐对猪粪堆肥过程氮磷保存的影响

采用混合水平均匀试验U6(62×3),考察猪粪堆肥过程中分别添加不同摩尔分数(20%、40%、60%)的改性赤泥(pH为5.0±0.2和7.0±0.2)、改性镁橄榄石(pH=7.0±0.2)以及硫酸镁对氮磷营养元素保存的影响.结果表明,以猪粪初始总氮含量的20%添加改性镁橄榄石(第17 d)和40%添加硫酸镁(第10 d)的保氮效果相近,并优于其他试验组.添加金属盐类的试验组的固磷效果均优于对照组,其中按20%添加pH=5的赤泥(第21 d)对TP的保存效果最佳,且其中正磷酸盐所占比例最小.

Impacts on N and P Conservation During Swine Manure Composting with Different Modified Metal-Salts Addition

Batch experiments were carried out by using mixed-level uniform design method U₆(6²×3) to investigate the effect of the addition of different metal-salts at 20%, 40% and 60% of N_TN respectively, including modified red-mud (MR) at pH 5.0±0.2 and 7.0±0.2, respectively, modified forsterite (MF) at pH 7.0±0.2, and MgSO₄ on nitrogen and phosphorus conservation during swine manure composting. The results showed that the optimum effect of N saved occurred at No.5 experiment (20%, MF, day 17) and No.3 experiment (40%, MgSO₄, day 10). Meanwhile, the P conservation of experiments with metal salts addition was better than that of the control, and the No.6 experiment (20%, MR with pH=5, day 21) was the highest on TP conservation, with the lowest ratio of PO^3-₄-P/TP.