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Microwave Irradiation as a Way to Reutilize the Recovered Struvite Slurry and to Enhance System Performance

회수된 MAP 슬러리의 재이용과 공정효율 향상을 위한 도구로서의 극초단파 조사

  • Cho, Joon-Hee (Department of Animal Life System, Kangwon National University) ;
  • Lee, Jin-Eui (Department of Animal Life System, Kangwon National University) ;
  • Ra, Chang-Six (Department of Animal Life System, Kangwon National University)
  • 조준희 (강원대학교 동물생명과학대학, 동물생명시스템학과) ;
  • 이진의 (강원대학교 동물생명과학대학, 동물생명시스템학과) ;
  • 라창식 (강원대학교 동물생명과학대학, 동물생명시스템학과)
  • Received : 2009.07.13
  • Accepted : 2009.08.14
  • Published : 2009.08.01

Abstract

The feasibility of reutilization of magnesium ammonium phosphate (MAP) or struvite slurry recovered from the process through microwave irradiation was studied in this experiment. For this purpose, 4 different operations were performed with or without Mg source addition and different levels of MAP recycled in a batch reactor. Dissolution rate of MAP, ${NH_4}^+$ elimination pattern and physicochemical changes of MAP during microwave irradiation were also studied. The result showed that only 33% orthophosphate ($PO_4-P$) and 27% $NH_4-N$ removal occurred without adding any external Mg source (run A), whereas 87% $PO_4-P$ and 40% $NH_4-N$ removed when 1.0 M ratio of $MgCl_2$ (run B) was added based on $PO_4-P$ in influent. Although the addition of 1.0 molar ratio of microwave irradiated MAP (Run C) removed lower $PO_4-P$ and $NH_4-N$ than 1.0 M $MgCl_2$ (run B), $PO_4-P$ removal was double when compared with no Mg addition (run A). Addition of half MAP and half $MgCl_2$ (run D) showed the similar removal efficiency (88% $PO_4-P$ and 35% $NH_4-N$) with sole $MgCl_2$ addition (run B). Based on these results, the reutilization of MAP irradiated by microwave would be a feasible way to enhance the removal efficiencies of N and P, as well as curtail the Mg chemical usage. Track study showed that $NH_4-N$ gradually increased at initial stage of microwave irradiation of MAP, and then started eliminating from liquor as temperature increased over $45^{\circ}C$. Dissolution rate of ${PO_4}^{-3}$ during microwave irradiation was proportional to the initial MAP concentration, having $0.0091x^{0.6373}$ mg/sec. It was found from the scanning electron microscope (SEM) study that physical structure of MAP crystal started breaking down into small cube granules within very short time by electromagnetic vibration force during microwave irradiation and then gradually melted down into solution.

Keywords

Microwave;Struvite;MAP ($MgNH_4PO_46H_2O$);Swine wastewater

Acknowledgement

Supported by : Korea Research Foundation

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