摘要
污泥中含有一定量的磷,污泥在储泥池中停留一定时间将会释放大量的磷到上清液中,因此采用磷酸铵镁法对储泥池污泥上清液中磷元素进行回收,可有效回收磷,提高资源利用。研究中探究了磷回收的最优条件。结果表明,镁磷摩尔比为1.2、终点p H为8.3~9.0时,磷元素的回收率维持在80%以上,可作为实际生产的控制条件,而继续增大镁磷摩尔比和提高终点p H,对磷的回收率提高较小。同时分析反应生成沉淀物发现,磷酸铵镁含量接近50%左右,且以Mg NH4PO4·H2O单晶体为主要成分。
There is a certain amount of phosphorus in the sludge and it will be massive released to the supernatant after remaining in the sludge storage pool for certain time.Therefore, it＇s a highly efficient and effective method to recycle the Phosphorus from the sludge supernatant of the sludge storage pool by crystallization of magnesium ammonium phosphate. This research mainly explored the best condition of recycling phosphorus. From the results, the mole ratio of magnesium and phosphate controlled in 1.2 and terminal p H =8.3~9.0 were best conditions under which the removal efficiency of phosphorus could achieve above 80 %. However, the increase of mole ratio of magnesium and phosphate could not obviously promote the removal efficiency of phosphorus in practical. The analysis of precipitation showed that the content of magnesium ammonium phosphate could reach about50 % and was the main ingredient of precipitation.
出处
《能源环境保护》
2015年第4期32-34,26,共4页
Energy Environmental Protection
关键词
磷酸铵镁
污泥
磷回收
最优条件
Magnesium Ammonium Phosphate
Sludge
Phosphorus recovery
Best condition
