养殖废水中磷鸟粪石结晶法回收潜力及影响因子研究  

The potential and the impact factors for phosphorus recovery from wastewater via struvite precipitation

作　　者：Erick K.Mutai 王选[1,3] 马林[1] Erick K.MUTAI;WANG Xuan;MA Lin(Key Laboratory of Agricultural Water Resources,Chinese Academy of Sciences/Hebei Key Laboratory of Soil Ecology/Center for Agricultural Resources Research,Institute of Genetics and Developmental Biology,Chinese Academy of Sciences,Shijiazhuang 050022,China;University of Chinese Academy of Sciences,Beijing 100049,China;Xiong’an Innovation Institute,Chinese Academy of Sciences,Xiong’an 071700,China)

机构地区：[1]中国科学院农业水资源重点实验室/河北省土壤生态学重点实验室/中国科学院遗传与发育生物学研究所农业资源研究中心,石家庄050022 [2]中国科学院大学,北京100049 [3]中国科学院雄安创新研究院,雄安新区071700

出　　处：《中国生态农业学报（中英文）》2022年第8期1346-1354,共9页Chinese Journal of Eco-Agriculture

基　　金：supported by the National Natural Science Foundation of China (31872403);the Science and Technology Program of Hebei Province(20327301D);the Strategic Priority Research Program of the Chinese Academy of Sciences (XDA28030302);the Youth Innovation Promotion Association of Chinese Academy of Sciences (2021095);Hebei Dairy Cattle Innovation Team of Modern Agroindustry Technology Research System(HBCT2018120206)

摘　　要：磷作为生命所必需的营养物质因其不可再生性、资源消耗和浪费导致的环境水体富营养化而引起人们的广泛关注。大量研究通过鸟粪石结晶技术从无机合成废水和真实废水中进行磷素回收,降低水体富营养化风险,并形成磷酸镁铵肥料。然而,鸟粪石结晶过程只涉及无机磷,而真实废水中有机磷含量高达总磷的30%~40%,导致鸟粪石结晶技术在实际应用中磷素回收率变异极大。目前,鸟粪石结晶法在真实废水与无机合成废水中磷回收率差距的量化分析缺乏,导致差异产生的机制和影响因子不明。本研究从103篇文献中收集了1186项观测数据,定量分析了在真实废水与无机合成废水中鸟粪石结晶磷回收率,解析了磷回收差距的潜在影响因子。结果表明,鸟粪石结晶法对无机合成废水中总磷的去除率(83.6%)高于真实废水(76.9%)。在真实废水中,鸟粪石结晶对pH和钙等外来离子更敏感,导致其总磷去除率变异较大,在20.4%和99.9%之间。镁离子和钙离子是影响鸟粪石结晶的重要因子,当Mg∶P比在1和2之间时,镁离子对鸟粪石结晶有积极的影响,而钙离子的存在对鸟粪石的形成有抑制作用。磷结晶沉淀作为一种非生物过程,有机磷矿化是总磷回收的限制因素。因此,曝气在有机磷矿化过程中起着重要作用,额外提供6 L∙min^(−1)的曝气流量有利于提高总磷和无机磷的回收率。提高镁磷比并不是提高磷回收率的关键因素,但对鸟粪石的组成和纯度具有显著影响。Phosphorous(P)is an essential nutrient for living organisms,and there is a concern regarding the challenges of both supply uncertainty and the linked aquatic eutrophication.Phosphorus recovery through struvite precipitation technology has attracted much attention in research as it prevents eutrophication and forms a slow-release fertilizer that serves as an alternative source of P in both synthetic wastewater(SW)and real waste(RW).However,only inorganic soluble P is involved in the reaction.Therefore,the ratio of organic P,which is up to 30%-40%of total P in real wastewater systems,leads to a variation of P recovery rates in practice.There is a lack of knowledge on the underlying differences and the factors causing the disparity in the P recovery,and few studies have attempted to quantify the gap in the P recovery rates of SW and RW.Data mining was conducted using 103 studies with 1186 observations to quantify the P recovery rate in SW and RW,establish the underlying factors affecting the P recovery,and derive solutions.Results showed that P recovery rate in SW(83.6%)was higher than that in RW(76.9%).A large variation in the P recovery rate(20.4%to 99.9%)in RW was detected since it was more sensitive to pH and foreign ions,such as calcium.Magnesium and calcium were found to impact struvite crystallization;magnesium had a positive impact at a specific Mg∶P ratio between 1 and 2,with SW being more sensitive,while calcium inhibited struvite formation.P precipitation is an abiotic process,and organic P concentration plays a crucial role in the total P recovery rate.Aeration played an important role in the mineralization of organic P.Therefore,supplying aeration at a flow rate of 6 L∙min^(−1) was beneficial for both total and inorganic P recovery.Increasing the Mg∶P ratio was not a crucial factor for P recovery in practice,but it significantly impacts the components of the precipitate.

关 键 词：磷 回收 鸟粪石 无机合成废水 真实废水 

分 类 号：X713[环境科学与工程—环境工程]