污水磷回收新产物--蓝铁矿  

New product of phosphorus recovery——Vivianite

作　　者：郝晓地[1] 周健[1] 王崇臣[1] Mark van Loosdrect HAO Xiaodi;ZHOU Jian;WANG Chongchen;Mark van Loosdrect(Sino-Dutch R＆D Centre for Future Wastewater Treatment Technologies/Key Laboratory of Urban Stormwater System and Water Environment,Bcijing University of Civil Engineering ＆ Architecture,Beijing 100044;Department of Biotechnology,Delft University of Technology,2629 HZ Delft,the Netherlands)

机构地区：[1]北京建筑大学城市雨水系统与水环境省部共建教育部重点实验室/中-荷未来污水处理技术研发中心,北京100044 [2]代尔夫特理工大学生物技术系,荷兰代尔伏特2629HZ

出　　处：《环境科学学报》2018年第11期4223-4234,共12页Acta Scientiae Circumstantiae

基　　金：国家自然科学基金项目(No.51878022); 北京“未来城市设计高精尖中心”项目(2018)

摘　　要：渐行渐近的磷危机使磷回收从理论已经走向实践.磷回收产物形式很多,但经济、具有高附加值的产物才能驱动企业自愿实施.在污水处理生物污泥中新近发现的蓝铁矿(Vivianite,Fe_3(PO_4)_2·8H_2O)沉淀物因潜在的特殊用途以及经济价值而备受关注.自然界,蓝铁矿广泛存在于地表水体沉积物中,是一种非常稳定(K_(sp)=10^(-36))的磷铁化合物.决定蓝铁矿生成的条件除富铁、富磷之内在因素外,还需要环境中存在合适的还原性条件(ORP<-300 mV)以及中性上下的pH条件(6～9).实践中,污水或污水处理过程中有时刚好存在蓝铁矿形成的内、外在条件,荷兰污水处理厂在生物污泥中便检测发现有蓝铁矿物质的存在.为推动蓝铁矿基础及其应用研究,本文综述蓝铁矿化学性质、经济价值及回收潜力;分析pH、ORP、微生物、硫化物等环境影响因素;辨析其在生物污泥中的生成路径;提出从污泥中分离、提纯蓝铁矿的研发思路.The potential crisis of phosphorus resource is unprecedentedly pushing phosphorus recovery from wastewater and other sources. Although products of phosphorus recovery are variable, economic and high value-added products could promote owners to do so voluntarily. Among others, vivianite （ Fe3 （ PO4 ） 2· 8H2 O）, which has been found to exist largely during biological sludge （ biomass）, is arousing attention to researchers. In fact, vivianite, a stable （Ksp = 10-36） ferrophosphorus compound, widely exists in natural sediments. Besides such inherent factors as rich iron and phosphate, there are also some external factors determining formation of vivianite, like low oxidation-reduction potentials （ORP〈-300 mV） and suitable pH conditions （6- 9）, etc. Fortunately, these inherent and external factors could be satisfied in wastewater and/or processes of wastewater treatment, and some wastewater treatment plants （WWTPs） in the Nethedands declared that they indeed found a large amount of vivianite presence in biological sludge. To promote both fundamental and applied researches on vivianite, the article reviews vivianite in： i） chemical properties, economic value and recovered potential; ii） controlling factors like pH, ORP, microorganisms, sulfide, etc. ; iii） pathways of vivianite formation in biological sludge; iv） separation and purification of vivianite.

关 键 词：磷回收 蓝铁矿 生物污泥 厌氧环境 异化金属还原菌(DMRB) 硫化物 

分 类 号：X703[环境科学与工程—环境工程]