Phosphorus sorption and supply from eutrophic lake sediment amended with thermally-treated calcium-rich attapulgite and a safety evaluation
Phosphorus sorption and supply from eutrophic lake sediment amended with thermally-treated calcium-rich attapulgite and a safety evaluation
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热处理富钙凹凸棒石对富营养化湖泊沉积物的磷吸附和供给及安全性评价
DOI：
10.1016/j.cej.2015.10.038
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发表时间：
2016-02
影响因子：
15.1
通讯作者：
Wanying Tang
中科院分区：
文献类型：
--
作者：
Hongbin Yin;Meixiang Han;Wanying Tang
改性粘土正越来越多地用作湖泊富营养化控制的磷灭活剂。然而，P与这些物质改良的沉积物的相互作用仍然不清楚。研究了热处理后富钙底泥对磷的吸附和供给，以及添加物的生态安全性。结果表明，磷在改性底泥上的吸附符合Langmuir吸附模型。投加物料可显著提高湖泊沉积物对磷的吸附能力，降低磷的零平衡浓度，使湖泊沉积物由磷源变为磷库。磷在原材料和改性底泥上的吸附量一般随水体pH值的升高而降低。但是，即使在藻类大量繁殖所导致的碱性环境中，经物质改良的沉积物仍然能够吸附大量的磷。NO3-和HCO 3-对磷吸附的影响较小，SO 42-对磷吸附的影响较小，SiO 3-对磷吸附的影响较大。薄膜扩散梯度（DGT）的测量结果表明，物质的添加在很大程度上抑制了湖泊沉积物供磷的能力。这是由于沉积物中的移动的P已转化为稳定的Ca-P。毒性研究表明，投加材料会使湖泊沉积物pH值升高，当投加量较大时，会对底栖生物产生毒性效应，但在野外投加材料后，这种毒性效应会大大减弱。研究结果表明，热处理富钙沸石具有作为磷钝化剂用于湖泊富营养化控制的潜力。
Modified clays are being increasingly used as P-inactivation agents for lake eutrophic control. However, the interaction of P with these material amended sediments still remain unclear. This study investigates the P sorption and supply from the thermally treated calcium-rich attapulgite amended eutrophic lake sediments as well as the ecological safety of material addition. The results indicated that P sorption on material amended sediment can be well fitted by a modified Langmuir model. Material addition can greatly enhance the P sorption capacity of lake sediment and lower the zero equilibrium P concentration (EPC0), which can turn lake sediment from a source to a pool. P sorption on raw and material amended sediment generally decreases with an increase of the water pH value. But material amended sediment still can adsorb a large amount of P even in very alkaline conditions resulting from algal blooms. Furthermore, P sorption on amended lake sediment was less influenced by NO3−and HCO3−than by SO42−to a moderate degree and by SiO3−to a much larger degree. The results of diffusive gradients in thin films (DGT) measurement indicated the ability of P supply from lake sediment was largely inhibited by material addition. This was due to sediment mobile P had been transformed into stable Ca-P. A toxicity study indicated that material additions can increase pH value in lake sediment and can cause a toxic effect on benthic organisms when a large addition of material is involved, but this would be greatly attenuated in the field. The results of this study indicated that thermally treated calcium-rich attapulgite has the potential to be used as a P-inactivation agent for lake eutrophication control.
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影响因子：
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