Composition of dissolved organic matter controls interactions with La and Al ions: Implications for phosphorus immobilization in eutrophic lakes
Composition of dissolved organic matter controls interactions with La and Al ions: Implications for phosphorus immobilization in eutrophic lakes
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溶解有机物的组成控制与 La 和 Al 离子的相互作用：对富营养化湖泊中磷固定的影响
DOI：
10.1016/j.envpol.2019.02.002
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发表时间：
2019
影响因子：
8.9
通讯作者：
Zhang Yunlin
中科院分区：
文献类型：
--
作者：
Du Yingxun;Zhang Qiaoying;Liu Zhengwen;He Hu;Lurling Miquel;Chen Musong;Zhang Yunlin
应用铝（Al）盐或镧（La）改性膨润土（LMB）已成为富营养化湖泊固定化磷(P)的常用方法。腐殖质的存在，已被证明抑制这种形式的处理，由于与La/Al络合。然而，其他溶解有机物（DOM）的影响，特别是来自浮游植物（富营养化湖泊的主要来源）的影响尚不清楚。本研究比较了苏万尼河标准腐植酸标准II （SRHA）和藻类衍生DOM （ADOM）与La/Al的相互作用。与以多酚样成分（76.8%,C1-SRHA）为主的SRHA不同，ADOM以蛋白质样物质为主，其中色氨酸样成分（C2-ADOM）占41.9%，酪氨酸样成分（C3-ADOM）占21.0%。SRHA/ADOM与La/Al之间存在络合反应和共沉淀反应。在小于10 μM的低金属输入时，络合反应为主，高金属输入时，共沉淀反应为主。对于ADOM，类色氨酸组分（C2-ADOM）是与金属反应的重要组分。C2-ADOM与La的反应速率约为C1-SRHA的2 / 3，说明在富营养化湖泊La/ al基固磷过程中，C2-ADOM的影响是显著的。ADOM存在时的P去除数据证实了ADOM的显著抑制作用。此外，根据共沉淀物的组成和色氨酸样物质（C2-ADOM）的相对可生物降解特性，认为ADOM的共沉淀物降低了富营养化湖泊中沉淀磷的稳定性。在La/ al基处理中，共沉淀物的潜在生物降解会释放出磷，从而可能导致固定磷性能的下降，这是未来的一项重要工作。
Applications of aluminium (Al) salt or lanthanum (La) modified bentonite (LMB) have become popular methodologies for immobilizing phosphorus (P) in eutrophic lakes. The presence of humic substances, has been shown to inhibit this form of treatment due to the complexation with La/Al. However, the effects of other dissolved organic matter (DOM), especially that derived from phytoplankton (the dominant source in eutrophic lakes) are unknown. In this study, the interaction with La/Al of Suwannee River Standard Humic Acid Standard II (SRHA) and algae-derived DOM (ADOM) were investigated and compared. Differed to SRHA which was dominated by polyphenol-like component (76.8%, C1-SRHA), majority in ADOM were protein-like substance, including 41.9% tryptophan-like component (C2-ADOM) and 21.0% tyrosine-like component (C3-ADOM). Two reactions of complexation and coprecipitation were observed between SRHA/ADOM and La/Al. Complexation dominated at low metal inputs less than 10 μM and coprecipitation was the main reaction at higher metal inputs. For ADOM, the tryptophan-like component (C2-ADOM) was the important component to react with metal. The reaction rate for C2-ADOM with La were about two-third of that for C1-SRHA, indicating that the influence of C2-ADOM was significant during the P immobilization by La/Al-based treatment in eutrophic lakes. The P removal data in the presence of ADOM confirmed the significant inhibition of ADOM. In addition, based on the composition of coprecipitates and relatively biodegradable character of tryptophan-like substances (C2-ADOM), the coprecipitation of ADOM was assumed to reduce the stability of precipitated P in eutrophic lakes. The release of P from the potential biodegradation of the coprecipitates and thus the possible decline of the performance of P immobilization by La/Al-based treatments is an important work in the future.