摘要
以CaO、MgO和白云石石灰(D-Lime)为晶种对模拟厌氧消化上清液进行磷回收试验,研究晶种投加量对磷去除效率的影响,分析试验反应动力学和产物表面形态。结果表明:磷浓度为0. 645 mmol/L(ρ(P)=20 mg/L)、n(N)/n(P)为8∶1、pH为7. 80的模拟水中,投加一定量的CaO、MgO和D-Lime进行磷回收试验,磷的去除率在95%以上,试验反应过程符合准一级反应动力学。针对消化上清液中的高浓度常见离子CO32-,当c(CO32-)≥10 mmol/L时,其对CaO除磷具有明显抑制作用,而对D-Lime和MgO抑制作用有限。此外,投加晶种中含有Mg2+时会生成磷酸铵镁晶体(magnesium ammonium phosphate,MAP)。
Removal and recovery of phosphate from simulated supernatant of sewage sludge anaerobic digestion effluent were compared using CaO,MgO and dolemite lime (D-Lime) as the crystal seeds respectively,and the kinetics and the surface morphology of the products were analyzed. The results indicated that the removal rate of phosphate were all over 95% using the three crystal,seeds with the condition of initial phosphorus concentration of 0. 645 mmol/L,molar ratio of nitrogen to phosphorus of 8 ∶ 1,and pH value of 7. 80. The phosphorus recovery resction was subject to the first order model. However,The high concentration of CO32- significantly inhibited the phosphorus removal rate while the CaO was used,but the decline of phosphorus removal rate were limited when the crystal seed was MgO or D-Lime. Moreover,the experimental results also demonstrated that MAP crystals could be obtained in the presence of crystal seed containing Mg2+.
作者
刘雪瑜
林郁
王方舟
颜秉斐
肖书虎
魏东洋
LIU Xue-yu;LIN Yu;WANG Fang-zhou;YAN Bing-fei;XIAO Shu-hu;WEI Dong-yang(Research institution of water Environment,Chinese Research Academy of Environmental Sciences,Beijing 100012,China;Beijing Key Laboratory of Water Resources and Environmental Engineering,China University of Geosciences,Beijing 100083,China;South China Institute of Environmental Sciences,MEP,Guangzhou 510655,China)
出处
《环境工程》
CAS
CSCD
北大核心
2020年第2期81-85,139,共6页
Environmental Engineering
基金
中央级公益性科研院所基本科研业务专项(2016YSKY-028)
国家自然科学基金(51878049)。
关键词
磷回收
晶种
化学沉淀法
动力学
phosphorus recovery
crystal seed
chemical precipitation
kinetics
