摘要
采用羟基磷酸钙(HAP)结晶法回收模拟养猪废水中的磷,探究了以废弃泡沫砼为Ca源的磷回收处理过程中3种因素[pH、n(Ca^(2+))/n(PO_(4)^(3-))、温度]的影响,利用Box-Behnken(BBD)得到最佳反应条件,并结合Visual MINETEQ模型探讨2种典型重金属Cu^(2+)、Zn^(2+)对HAP结晶体系的单独及联合影响。结果表明:基于磷回收的最佳反应条件为pH=9.37,n(Ca^(2+))/n(PO_(4)^(3-))=1.669,温度=25.46℃;Cu^(2+)对HAP结晶的影响大于Zn^(2+),联合投加时Cu^(2+)、Zn^(2+)的抑制作用增强;扫描电镜(SEM)表明重金属的引入改变了HAP表面结构,占据活性点位;能量色散X射线谱仪(EDS)表明Cu、Zn分别以9.79%、9.88%的质量比进入到了结晶产物中;Visual MINTEQ模拟结果证实Cu^(2+)、Zn^(2+)均会竞争HAP的构晶离子,抑制磷的回收,其中Cu^(2+)主要与OH^(-)竞争,Zn^(2+)主要与PO_(4)^(3-)竞争。研究可为废弃泡沫砼在均相条件下回收养猪废水中的磷提供参考。
The effect of three factors[pH,n(Ca^(2+))/n(PO_(4)^(3-)),and temperature]on the phosphorus recovery treatment process using waste foam concrete as the Ca source was investigated using the calcium hydroxyphosphate(HAP)crystallization method to recover phosphorus from simulated swine wastewater.The optimal reaction conditions were obtained using Box-Behnken(BBD)and combined with the Visual MINETEQ model to explore the individual and combined effects of 2 typical heavy metals(Cu^(2+)、Zn^(2+))on the HAP crystallization system.The results showed that the optimal reaction conditions were pH=9.37,n(Ca^(2+))/n(PO_(4)^(3-))=1.669,temperature=25.46℃;the effect of Cu^(2+)on HAP crystallization was greater than that of Zn^(2+),and the inhibitory effect of Cu^(2+)and Zn^(2+)was enhanced when combined with the injection;Scanning electron microscopy(SEM)showed that the introduction of heavy metals changed the HAP surface structure and occupied the active sites,and energy dispersive X-ray spectroscopy(EDS)showed that Cu and Zn entered the crystalline products at 9.79%and 9.88%mass ratios,respectively;Visual MINTEQ simulation results confirmed that Cu^(2+)and Zn^(2+)both compete for the constitutive ions of HAP and inhibit phosphorus recovery,with Cu^(2+)mainly competing for OH^(-)and Zn^(2+)mainly competing for PO_(4)^(3-).This study provides a reference for the recovery of phosphorus from pig wastewater in waste foam concrete under homogeneous conditions.
作者
朱佳明
贺玥澄
龙定彪
黄骞
许文来
蒲施桦
简悦
ZHU Jiaming;HE Yuecheng;LONG Dingbiao;HUANG Qian;XU Wenlai;PU Shihua;JIAN Yue(Chongqing Academy of Animal Sciences,Chongqing 402460,China;National Center of Technology Innovation for Pigs,Chongqing 402460,China;State Key Laboratory of Geohazard Prevention and Geoenvironment Protection,Chengdu University of Technology,Chengdu 610066,China)
出处
《环境工程》
CAS
CSCD
北大核心
2023年第8期1-7,17,共8页
Environmental Engineering
基金
国家现代农业产业技术体系资助(CARS-35)
重庆荣昌农牧高新技术产业研发专项(cstc2019ngzx0004)
畜禽养殖环境调控与装备研发创新创业团队(19207)。
