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The phosphorus recovery efficiency through calcium phosphate (Ca-P) crystallization in wastewater demonstrates significant susceptibility to carbonate alkalinity (CO₃^2-), a predominant coexisting impurity in wastewater. To elucidate the influence of CO₃^2- alkalinity on phosphorus recovery of Ca-P crystallization, the variation of pH, conductivity, alkalinity, and Ca morphology in Ca-P crystalline systems with difference CO₃^2- alkalinity levels were systematically analyzed by integrated potentiometric titration and jar testing. Meanwhile, the influence mechanism of CO₃^2- alkalinity was explored based on the kinetics of phosphorus recovery and XRD results of crystallization products. The results indicate that, provided crystallization reaction time long enough, phosphorus recovery efficiency was less affected by CO₃^2- alkalinity, but mainly determined by the thermodynamic properties of Ca-P crystallization product itself. Under extended reaction durations (7200s), phosphorus recovery efficiencies stabilized at around 40% across all experimental and control groups. CO₃^2- alkalinity changed the kinetics of Ca-P crystallization. CO₃^2- alkalinity with low level promoted Ca-P crystallization by providing alkalinity, compared to delay of Ca-P crystallization by consuming free Ca²⁺ through calcium carbonate (Ca-C) crystallization while at high level. Driven by thermodynamic properties, Ca-C ion clusters and crystals would dissolve and release free Ca for continuous crystallization of Ca-P. The research results provide a direct theoretical basis for eliminating the influence of CO₃^2- alkalinity on the phosphorus recovery efficiency of Ca-P crystalline from wastewater.

, authors=Zhe-yu YI¹, Xiao-bao NIE^{2, *}, Yao-ting CHEN², Heng JIANG³, Zi-cheng ZHAO¹, Yao-yang TANG¹, Jiao-yi LIU¹, Ge-ya YU¹, authorsList=Zhe-yu YI, Xiao-bao NIE, Yao-ting CHEN, Heng JIANG, Zi-cheng ZHAO, Yao-yang TANG, Jiao-yi LIU, Ge-ya YU, authorCompany=null, correspAuthors=Xiao-bao NIE, authorNote=null, correspAuthorsNote=null, copyrightStatement=null, copyrightOwner=null, extLink=null, articleAbsUrl=null, sourceXml=null, magXml=null, pdfUrl=null, pdf=null, pdfFileSize=null, pdfExtLink=null, richHtmlUrl=null, mobilePdfUrl=null, reviewReport=null, pdfFirstPage=null, abstractGraph=null, abstractGraphContent=null, abstractVideo=null, citation=null, cebUrl=null, magXmlContent=null, mapNumber=null, fund=null), CN=ArticleExt(id=1314918406147637579, articleId=1314918405719818569, tenantId=1146029695717560320, journalId=1234093305789726721, language=CN, title=CO₃^2-碱度对污水CaP结晶磷回收的影响研究, columnId=1234106386565624579, journalTitle=中国环境科学, columnName=水污染与控制, runingTitle=null, highlight=null, articleAbstract=

污水磷酸钙（Ca-P）结晶磷回收效果易受共存杂质CO₃^2-碱度影响,为探明CO₃^2-碱度对Ca-P结晶磷回收的影响,综合运用电位滴定实验和烧杯实验,全面分析了不同CO₃^2-碱度下Ca-P结晶体系pH值、电导率、碱度和Ca形态变化,并结合磷回收动力学过程和结晶产物XRD结果,探讨了CO₃^2-碱度的影响机制.结果表明,当结晶反应时间足够长时,Ca-P结晶磷回收效果受CO₃^2-碱度影响较小,而是主要决定于Ca-P结晶产物自身热力学性质.实验条件下,结晶反应时间为7200s时,各实验组和空白组磷回收率均为40%左右. CO₃^2-碱度改变了Ca-P结晶磷回收动力学过程,低CO₃^2-碱度时以提供碱度促进Ca-P结晶为主,高CO₃^2-碱度时则通过碳酸钙（Ca-C）结晶消耗游离态Ca²⁺迟滞Ca-P结晶.受热力学特性驱动, Ca-C离子簇和晶体将溶解释放游离态Ca供Ca-P持续结晶.研究成果为消除CO₃^2-碱度对污水Ca-P结晶磷回收效果的影响提供了直接理论依据.

, authors=易哲宇¹, 聂小保^{2, *}, 陈耀庭², 姜恒³, 赵梓程¹, 唐耀扬¹, 刘家羿¹, 余格雅¹, authorsList=易哲宇, 聂小保, 陈耀庭, 姜恒, 赵梓程, 唐耀扬, 刘家羿, 余格雅, authorCompany=null, correspAuthors=聂小保, authorNote=, correspAuthorsNote=, copyrightStatement=null, copyrightOwner=null, extLink=null, articleAbsUrl=null, sourceXml=EaT9rr+bmVYXUCJO0T4E5w==, magXml=8wE8TWpdsSSXgEse9N4hIQ==, pdfUrl=null, pdf=V6hclLneVt/nbbOWBW5hiA==, pdfFileSize=2788685, pdfExtLink=null, richHtmlUrl=null, mobilePdfUrl=null, reviewReport=null, pdfFirstPage=null, abstractGraph=null, abstractGraphContent=null, abstractVideo=null, citation=null, cebUrl=null, magXmlContent=OTLxAqsF0shepY53SLeVKA==, mapNumber=null, fund=null)}, authors=[Author(id=1314918408190263638, tenantId=1146029695717560320, journalId=1234093305789726721, articleId=1314918405719818569, orderNo=0, firstName=null, middleName=null, lastName=null, nameCn=null, orcid=null, stid=null, country=null, authorPic=null, dead=0, email=1935579149@qq.com, emailSecond=null, emailThird=null, correspondingAuthor=0, authorType=1, ext={EN=AuthorExt(id=1314918408282538328, tenantId=1146029695717560320, journalId=1234093305789726721, articleId=1314918405719818569, authorId=1314918408190263638, language=EN, stringName=Zhe-yu YI, firstName=Zhe-yu, middleName=null, lastName=YI, prefix=null, suffix=null, authorComment=null, nameInitials=null, affiliation=null, department=null, xref=¹, address=^1.International College of Engineering, Changsha University of Science & Technology, Changsha 410114, China, bio=null, bioImg=null, bioContent=null, aboutCorrespAuthor=null), CN=AuthorExt(id=1314918408383201625, tenantId=1146029695717560320, journalId=1234093305789726721, articleId=1314918405719818569, authorId=1314918408190263638, language=CN, stringName=易哲宇, firstName=null, middleName=null, lastName=null, prefix=null, suffix=null, authorComment=null, nameInitials=null, affiliation=null, department=null, xref=¹, address=^1.长沙理工大学国际工学院，湖南 长沙 410104, bio={"content":"

易哲宇（2004-），男，湖南长沙人，长沙理工大学本科生，主要从事污水污泥资源化利用方面研究．1935579149@qq.com.

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易哲宇（2004-），男，湖南长沙人，长沙理工大学本科生，主要从事污水污泥资源化利用方面研究．1935579149@qq.com.

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