文献类型：期刊文献

英文题名：Repeated use of MgNH₄PO₄?6H₂O residues for ammonium removal by acid dipping

作者：Zhang, SJ; Yao, CH; Feng, XX; Yang, M

机构：[1]Chinese Acad Sci, Ecoenvironm Sci Res Ctr, State Key Lab Environm Aquat Chem, Beijing 100085, Peoples R China;[2]E China Univ Sci & Technol, Inst Environm Engn, Shanghai 200237, Peoples R China

年份：2004

卷号：170

期号：1

起止页码：27

外文期刊名：DESALINATION

收录：;WOS:【SCI-EXPANDED(收录号:WOS:000224993700003)】；

语种：英文

外文关键词：acid dipping; ammonium removal; MAP; reuse; wastewater treatment

摘要：A novel process was developed to repeatedly utilize MgNH(4)PO(4)(.)6H(2)O (MAP) for ammonium removal from wastewater by releasing ammonium in MAP through acid dipping. In acid solutions, ammonium can be released to solution from MAP while MAP was transformed to MgHPO4, which can be used to remove ammonium again. Ammonium-N concentration in acid solutions increased with the decreasing pH and increasing temperature, up to 3.27 x 10(4) Mg/l at 60degreesC and pH 4.8. MAP also dissolved into acid solutions when transformation to (MgHPO4N)-N-.:P, indicating the ratio of MAP transformation to MAP dissolution, was maximum at pH 6.0 and increased with the temperature. N:P was up to 38.8 at 60degreesC and pH 6.0. Recycling experiments were done. Ammonium-N in effluents was lower than 20 mg/l in the first five cycles, which indicates the feasibility of this process. XRD spectra also validate the transformation between MAP and MgHPO4.