Daumer M L, Beline F, Guiziou F
CEMAGREF, Livestock and Municipal Wastes Management Reseach Unit, 17 av. de Cucille, CS 64427, 35044 Rennes Cedex, France.
Environ Technol. 2003 Nov;24(11):1323-30. doi: 10.1080/09593330309385676.
The fate of phosphorus distribution in the products obtained from biological aerobic treatment of pig slurry, e.g. separated solids, liquid effluent and sludge, was monitored in three different farm-scale units. Samples of raw slurry, solid products, aerated slurry, liquid effluent and sludge were characterised and analysed for their concentration in total phosphorus, nitrogen content and heavy metals (Cu and Zn). At each treatment stage, nitrogen, phosphorus and heavy metals mass balance between input and output was established. Moreover, liquid products were characterised and analysed both for their total and dissolved ortho-phosphate content. Separated solids, sludge and liquid effluent represented 5%, 15-40% and 75-83% of the mass of the raw slurry, respectively. A mechanical separation step prior to aeration allowed the export of 25-30% of total phosphorus for further use as organic fertiliser. A large amount of total phosphorus (e.g. 60-70%) was located in sludge while phosphorus remaining in liquid effluent was about 15-25%. Raw slurry separation and sufficient aeration allowed phosphorus to concentrate in the sludge. Insufficient aeration resulted in the release of phosphorus as dissolved ortho-phosphate within the liquid effluent. Finally, relevance of the agronomic use of the products was discussed and improvements of biological aerobic treatment to enhance phosphorus removal and/or recovery were considered.
在三个不同的农场规模单元中，监测了猪粪生物好氧处理所得产物（如分离出的固体、液体流出物和污泥）中磷的分布情况。对原粪浆、固体产物、曝气粪浆、液体流出物和污泥的样本进行了表征，并分析了它们的总磷浓度、氮含量和重金属（铜和锌）含量。在每个处理阶段，建立了输入和输出之间的氮、磷和重金属质量平衡。此外，还对液体产物的总正磷酸盐含量和溶解正磷酸盐含量进行了表征和分析。分离出的固体、污泥和液体流出物分别占原粪浆质量的5%、15 - 40%和75 - 83%。曝气前的机械分离步骤可输出25 - 30%的总磷，以供进一步用作有机肥料。大量的总磷（如60 - 70%）存在于污泥中，而液体流出物中剩余的磷约为15 - 25%。原粪浆分离和充足的曝气使磷集中在污泥中。曝气不足导致磷以溶解正磷酸盐的形式释放到液体流出物中。最后，讨论了这些产物在农业上使用的相关性，并考虑了改进生物好氧处理以提高磷去除和/或回收的方法。
