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Desalination and Water Treatment Volume 56, 2015 - Issue 11
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Articles

Optimization of struvite crystallization to recover nutrients from raw swine wastewater

Qintie LinSchool of Environmental Science and Engineering, Guangdong University of Technology, Guangzhou510006, P.R. China, Tel./Fax: +86 20 39322291(Qintie Lin), (Jieting Liu), (Jiale Ye), (Lu Zhang), Tel./Fax: +86 20 39322295(Bing Tang)Correspondence[email protected]
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Zhiliang ChenSouth China Institute of Environmental Science, MEP, Guangzhou510655, P.R. China, Tel. +86 20 85541902; Fax: +86 20 85544017Correspondence[email protected]
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Jieting LiuSchool of Environmental Science and Engineering, Guangdong University of Technology, Guangzhou510006, P.R. China, Tel./Fax: +86 20 39322291(Qintie Lin), (Jieting Liu), (Jiale Ye), (Lu Zhang), Tel./Fax: +86 20 39322295(Bing Tang)Correspondence[email protected]
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Bing TangSchool of Environmental Science and Engineering, Guangdong University of Technology, Guangzhou510006, P.R. China, Tel./Fax: +86 20 39322291(Qintie Lin), (Jieting Liu), (Jiale Ye), (Lu Zhang), Tel./Fax: +86 20 39322295(Bing Tang)Correspondence[email protected]
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Jiale YeSchool of Environmental Science and Engineering, Guangdong University of Technology, Guangzhou510006, P.R. China, Tel./Fax: +86 20 39322291(Qintie Lin), (Jieting Liu), (Jiale Ye), (Lu Zhang), Tel./Fax: +86 20 39322295(Bing Tang)Correspondence[email protected]
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Lu ZhangSchool of Environmental Science and Engineering, Guangdong University of Technology, Guangzhou510006, P.R. China, Tel./Fax: +86 20 39322291(Qintie Lin), (Jieting Liu), (Jiale Ye), (Lu Zhang), Tel./Fax: +86 20 39322295(Bing Tang)Correspondence[email protected]
Pages 3106-3112 | Received 14 Mar 2014, Accepted 03 Sep 2014, Published online: 24 Sep 2014
 
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Abstract

For the nitrogen and phosphorus resource recovery from raw swine wastewater, laboratory-scale batch experiments were carried out to investigate the effects of pH value, magnesium dosage, and phosphate dosage on struvite crystallization. The crystallization process of the struvite was observed under inverted microscope, and the composition and morphology of the precipitates were characterized by X-ray diffraction and scanning electron microscope. It has been found that the optimal parameters were a Mg2+/ molar ratio of 1.6, a / molar ratio of 1.3, and a pH of 10.0. The results showed that a large number of crystals had been formed in 5 min under optimal conditions, the precipitates were orthorhombic crystal systems with 10–20 μm in length, and they were proved to be struvite. When pH value reached 11.5, there were few crystals in the precipitates, and Mg(OH)2 was formed instead of struvite.

Acknowledgements

This work was financially supported by the Special Foundation for Technique Development Research of Institute affiliated to the National Department of Science and Technology (2013 EG111128), the Cooperation Plan of Industry, Education, Academy Sponsored by Guangdong province government, Education Department/Science and Technical Department of Chinese government (2012B091100176), and Foundation for High-level Talents in Higher Education of Guangdong, China (2014009).

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