压榨脱水中水葫芦氮磷钾养分损失研究

以水葫芦为试验材料,经机械粉碎,在0~12 MPa的压力条件下,研究了水葫芦脱水效果及脱水过程中水葫芦氮、磷、钾等养分的损失,结果表明,随着压力由0增加至12 MPa时,水葫芦含水率由初始的94.72%降低至68.90%,脱水率高达91.27%,其干物质损失率为29.31%。水葫芦中氮、磷、钾等养分在液相中的比例随挤压压力增加而增加;当压力为12 MPa时,挤压残渣中氮、磷、钾养分的损失率分别为52.28%、47.83%、84.83%,各养分损失与其在水葫芦中的存在形态密切相关,养分游离性越高,其损失率越高。

Losses in nitrogen, phosphorus and potassium of water hyacinth dehydrated by mechanical press

An experiment was carried out to investigate the effect of dehydration by mechanical press on water removal and NPK losses.The results showed that when the pressure increased from 0 MPa to 12MPa,the moisture content was reduced from 94.72% to 68.90%.The dehydration rate was up to 91.27% and the dry matter loss was up to 29.31%.The leached NPK increased as the pressure increased.Under a pressure up to 12MPa,the maximum losses in NPK were 52.28%,47.83% and 84.83%,respectively.The rates of loss on different nu...