Enhanced struvite recovery from wastewater using a novel cone-inserted fluidized bed reactor

查看全文 作　　者：Awoke [1]Guadie;Siqing [2]Xia;Wei [2]Jiang;Lijie [2]Zhou;Zhiqiang [2,3]Zhang;Slawomir [4]W.Hermanowicz;Xiaoyin [2]Xu;Shuang [2]Shen

机构地区：[1]UNEP-Tongji Institute of Environment for Sustainable Development, College of Environmental Science and Engineering, Tongji University;[2]State Key Laboratory of Pollution Control and Resource Reuse, College of Environmental Science and Engineering, Tongji University;[3]Key Laboratory of Yangtze River Water Environment, Ministry of Education, College of Environmental Science and Engineering, Tongji University;[4]Department of Civil and Environmental Engineering, University of California

出　　处：《Journal of Environmental Sciences》索引2014年第26卷第4期,共10页

基　　金：supported by the Fundamental Research Funds for the Central Universities and Shanghai Shuguang Tracking Program(No.10GG12);the National Science and Technology Pillar Program;the 1st World Mem-brane Bioreactor(MBR)Centre 摘　　要：The feasibility of struvite recovery at low(12.5 mg/L) and high(120 mg/L) phosphorus concentrations was studied by constructing a novel fluidized bed reactor with cones(FBRwc) and without cones(FBRwoc). The crystallization process was continuously operated for 133 days under different hydraulic retention times(HRT = 1–10 hr), pH(7.5–10), and molar ratios of Mg/P(0.75–1.75), N/P(1–10) and Ca/Mg(0–2). The optimum operating conditions of HRT, pH, Mg/P and N/P molar ratios were found to be 2 hr, 9, 1.25, and 7.5, respectively. Under these optimum conditions, the phosphorus precipitation efficiencies of FBRwcwere 93% for low and 98% for high phosphorus influent; however, the efficiencies were 78% and 81% for FBRwoc, respectively. Due to crystal losses at each junction(17%–31%), the crystal recovery efficiency of FBRwocwas relatively low(47%–65%) for both influent concentrations. However, the losses were minimal in FBRwc, which showed 75% and 92% crystal recovery for low and high phosphorus concentrations, respectively. At low calcium concentration, crystal chemical analysis showed the product to be pure struvite(> 99%). The scanning electron microscope and X-ray diffraction results further confirmed that the crystal recovered from FBRwc contained pure struvite, which could be considered a high quality fertilizer. Except HRT, all parameters(pH, Mg/P, N/P and Ca/Mg) were found to be influencing factors for FBRwcperformance. Overall, inserting cones in each part of the reactor played a significant role in enhancing struvite recovery from a wide range of phosphorus-containing wastewater. 关键词：流化床反应器回收效率含磷废水鸟粪石水力停留时间扫描电子显微镜锥形最佳操作条件

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Enhanced struvite recovery from wastewater using a novel cone-inserted fluidized bed reactor

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