Ammonium removal from digested effluent of swine wastewater by using solid residue from magnesium-hydroxide flue gas desulfurization process

[Display omitted] •First report on ammonium removal using MFGD residue as a Mg source.•MAP optimally formed at pH 9.5, HRT 10min and n(PO43−):n(Mg2+):n(NH4+)=0.6:0.7:1.•Ammonium concentration was less than 200mgL−1 in DESW after MAP precipitation.•Total chemical cost was saved by 29.17% compared to...

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Published in:	Journal of industrial and engineering chemistry (Seoul, Korea) Vol. 58; pp. 148 - 154
Main Authors:	Lin, Huanjia, Lin, Yunqin, Wang, Dehan, Pang, Yuwan, Zhang, Fabao, Tan, Shuanhu
Format:	Journal Article
Language:	English
Published:	Elsevier B.V 25-02-2018 한국공업화학회
Subjects:	Ammonium removal Digested effluent of swine wastewater MAP precipitation Solid residue from MFGD process 화학공학 MAP precipitation Ammonium removal Solid residue from MFGD process Digested effluent of swine wastewater
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Summary:	[Display omitted] •First report on ammonium removal using MFGD residue as a Mg source.•MAP optimally formed at pH 9.5, HRT 10min and n(PO43−):n(Mg2+):n(NH4+)=0.6:0.7:1.•Ammonium concentration was less than 200mgL−1 in DESW after MAP precipitation.•Total chemical cost was saved by 29.17% compared to MgCl2 application. This paper focused on the ammonium removal from the digested effluent of swine wastewater (DESW) via MAP precipitation using the residue from magnesium-hydroxide flue gas desulfurization (MFGD) process as a Mg source. The MAP precipitation was proceeded in a 500-mL beaker with a magnetic stirrer. It was found that around 60% of ammonium in the DESW was removed at pH 9.5, HRT 10min and the P:Mg:N molar ratio of 0.6:0.7:1. The NH4+ concentration (183.2mg/L) in the DESW after MAP precipitation was lower than 200mgL−1, being alternative for the downstream biological process. A low content of PO43− (3.64mgL−1) and a high concentration of Mg2+ (67.17mgL−1) were also observed in the solution. The main composition of the precipitate was proved to be MAP via XRD and SEM-EDX analysis. Besides, the total chemical cost was saved by 29.17% using the MFGD residue as a Mg source instead of the commercial MgCl2·6H2O. Hence, reusing MFGD residue as a Mg source to remove ammonium from the DESW was feasible with cost saving, resource recovery and environment protection.
ISSN:	1226-086X 1876-794X
DOI:	10.1016/j.jiec.2017.09.019