[KSCI] Korea Science Citation Index Service

http://dx.doi.org/10.4491/eer.2016.037

Effects of pH, molar ratios and pre-treatment on phosphorus recovery through struvite crystallization from effluent of anaerobically digested swine wastewater

Kim, Daegi (Institute for Advanced Engineering)
Min, Kyung Jin (Department of Civil and Environmental System Engineering, Konkuk University)
Lee, Kwanyong (Korea Institute of Civil Engineering and Building Technology)
Yu, Min Sung (Department of Civil and Environmental System Engineering, Konkuk University)
Park, Ki Young (Department of Civil and Environmental System Engineering, Konkuk University)

Publication Information

Environmental Engineering Research / v.22, no.1, 2017 , pp. 12-18 More about this Journal

Abstract

Struvite precipitation has been proven to be an effective method in removing and recovering ammonia nitrogen (N) and phosphate phosphorus (P) from wastewater. In this study, effects of pH, molar ratios and pre-treatment of effluent of anaerobically digested swine wastewater were investigated to improve struvite crystallization. The magnesium : ammonium : phosphate ratio of 1.2 : 1.0 : 1.0 was found to be optimal, yet the molar ratio in the wastewater was 1 : 74.9 : 1.8. From the analysis, the optimum pH was between 8.0 and 9.0 for maximal phosphate P release and from 8.0 to 10.0 for maximal ammonia N and phosphate P removal from real wastewater. Analysis from Visual MINTEQ predicted the pH range of 7-11 for ammonia N and phosphate P removal and recovery as struvite. For pre-treatment, microwave pre-treatment was ineffective for phosphate P release but ultrasound pre-treatment showed up to 77.4% phosphate P release at 1,000 kJ/L of energy dose. Precipitates analysis showed that phosphorus and magnesium in the collected precipitate had almost same values as theoretical values, but the ammonia content was less than the theoretical value.

Keywords

Ammonia and phosphate recovery; Magnesium ammonium phosphate; Pre-treatment; Struvite; Ultrasonic treatment;

Citations & Related Records

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