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하수찌꺼기 소각재에서 초음파를 이용한 인 회수 시스템(PRS) 개발
최예덕 ( Ye Duk Choi ),이준연 ( Jun Yeon Lee ),장주호 ( Zoo Ho Jang ),정중곤 ( Jung Gone Joung ),한규문 ( Kyu Mun Han ),이목영 ( Mok Young Lee ),정권 ( Kweon Jung ) 한국폐기물자원순환학회(구 한국폐기물학회) 2019 한국폐기물자원순환학회지 Vol.36 No.2
This study was performed to develop a Phosphorus Recovery System (PRS) for the recovery of phosphorus from incinerated sewage sludge ash using struvite precipitation. Fly ash generated at the Seonam sewage treatment plant has a high P<sub>2</sub>O<sub>5</sub> content (13.9%). We developed a PRS consisting of an ultrasonic extractor, solid-liquid separator, mixing tank, and phosphorus recovery tank. The ultrasonic extractor had a 28 kHz vibrator for high speed and efficiency, which could perform the extraction in one-quarter of the time required in the conventional stirring method. Results of tests on the ultrasonic extractor showed that up to 0.044 g of PO<sub>4</sub> <sup>3-</sup>-P per gram of ash could be extracted with 1 N NaOH at an L/S ratio of 10 mL/g and an ultrasonic output of 500 Wh for 0.5 hr. The PRS showed the fraction of Mg and P was >70% in struvite. The PRS utilizing leachate is an effective and low-cost process that removes and recovers NH<sub>4</sub> <sup>+</sup> from landfill leachate. The PRS is needed to improve the operation method and economic analysis to commercialize the technology and its application through further studies.