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- Title
A modified attapulgite clay for controlling infiltration of reclaimed water riverbed.
- Authors
Zhongwei, Liu; Pengxiang, Li; Zigong, Ning; Yang, Xiao; Chengzhi, Wang; Yunkai, Li
- Abstract
Reusing reclaimed water is considered an effective way to abate water shortages in mega cities and protect the ecological status of rivers and lakes. Controlling of riverbed infiltration is an important way to protect the water environment, as it ensures the recycle of groundwater and maintained the groundwater quality in the recharge zone. The composite of attapulgite clay (AC) and modified-AC (MAC), named three-dimensional network adsorbent, was selected as the infiltration reduction materials, and the ability of controlling infiltration and purification were tested. Results showed that the permeability coefficient reached 10 cm/s when AC and MAC were mixed at a ratio of 95:5 and 97:3, respectively. And when the layer thickness was 2-10 cm, the infiltration reduction capacity improved with the increased layer thickness and MAC content. The result of fine particles was greater than coarse particles. As the larger average pore diameter of coarse particles, the cumulative infiltration quantity and permeability coefficient of the AC and MAC coarse particles were lower, in the range of 10.98-11.16 %. The adsorption of ammonium nitrogen (NH) was linear while phosphate (PO-P) adsorption was nonlinear. Reusing reclaimed water could significantly inhibit the adsorption of NH and PO-P by AC and MAC.
- Subjects
FULLER'S earth; WATER reuse; RIVER channels; WATER purification; AMMONIUM; NITROGEN in water
- Publication
Environmental Earth Sciences, 2015, Vol 73, Issue 7, p3887
- ISSN
1866-6280
- Publication type
Article
- DOI
10.1007/s12665-014-3673-z