热改性凹土钝化底泥对水体磷的吸附特征研究

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Abstract

In this study, the thermally-treated calcium-rich attapulgite was used as low-cost P sorbent amendments and which was added into lake sediment with different percentage. The P sorption on the material amended sediment and the sediment P fractionation were studied. The results indicated that the P sorption capacity and sorption rate were greatly enhanced with addition of the material. Specifically, the maximum P sorption capacity and sorption rate have been increased 1.5 to 2.0 times and 1.7 to 3.7times respectively with addition of 5% to 20% of material. In addition, material addition can increase the capacity of resisting disturbance of lake sediment. The interference of pH, NO₃^- and HCO₃^- on P sorption on the amended sediment has been attenuated. However, SO₄^2- and SiO₃^2- still exert great influence on P sorption on amended sediment. The results of P fractionation indicated that material addition can transform Al-P to Ca-P in sediment, increase the percentage of inert P and therefore low the P release into overlying from the sediment. All of the results suggested that the thermally-treated calcium-rich can be used as an effective material for lake eutrophication control.

Key words： attapulgite sediment phosphorus lake eutrophication

Received: 27 May 2015

PACS:

X524

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	HAN Mei-xiang
	YIN Hong-bin
	TANG Wan-ying

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HAN Mei-xiang,YIN Hong-bin,TANG Wan-ying. Phosphorus sorption from aqueous solution by the thermally-treated attapulgite amended sediment[J]. CHINA ENVIRONMENTAL SCIENCECE, 2016, 36(1): 100-108.

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http://manu36.magtech.com.cn/Jweb_zghjkx/EN/ OR http://manu36.magtech.com.cn/Jweb_zghjkx/EN/Y2016/V36/I1/100

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