不同通风方式对添加镁盐后猪粪堆肥过程中氮磷保存的影响

Impacts of Different Aeration Modes on Nutrients Conservation During Swine Manure Composting with Magnesium Salt Addition

考察和比较了2种通风方式对添加氯化镁后猪粪高温堆肥过程中氮、磷养分保留的影响.结果表明,高温堆肥阶段结束后,采用间歇通风方式堆体的氨气形态氮素损失量为23.56 g,采用连续通风方式堆体的氨气形态氮素损失量为56.98 g,前者氨气形态氮素损失量仅为后者的41.35%,这导致前者堆料中的总氮(TKN)含量比后者高出9.8%.通风方式对猪粪堆肥过程中的水溶态磷、总磷和分级磷没有显著影响,但间歇通风堆体中易溶解态磷占总磷的比例从27.6%提高到66.5%,连续通风堆体易溶解态磷的从27.3%增加到64.9%.高温堆肥阶段结束后,2个堆体的总磷含量均为17.2 g/kg.2个堆体中都生成了含有镁盐的混合晶体.

Experiments were carried out to investigate the effect of two aeration modes on nutrients conservation in the thermophilic stage of swine manure composting with adding magnesium chloride. These results indicated that in the end of thermophilic stage of composting, the ammonia nitrogen losses of the piles with the intermittent aeration and with continuous aeration, were 23.56 g and 56.98 g, respectively, which means the loss of ammonia nitrogen of swine composting by the intermittent aeration was just 41.35 % of that by the continuous aeration. Such loss of ammonia nitrogen resulted in 9.8% higher of the total kjeldahl nitrogen （TKN） concentration in the pile with the intermittent aeration than that with the continuous aeration. No significant difference occurred between two piles in orthophosphate, sequential extraction phosphorus and the total phosphorus （TP）. However, in the pile with intermittent aeration, the percentage of the easily dissolved phosphorous forms such as H2O-P and NaHCO3 -P was increased from 27.6 % of TP to 66.5 %, and the other pile from 27.6 % to 64.9 %. The TP concentrations in both piles were 17.2 g/kg in the end of thermophilic composting stage. The mixed crystals containing magnesium and phosphorus were formed in both piles of swine composting.