Chinese Academy of Sciences

Zhifei Ma

Yu Yang

Beidou Xi

Yonghai Jiang

Xinying Lian

Mingxiao Li

Min Li

Xu Han

Lieyu Zhang

Fu Xia

Xiangjian Xu

Fangyi Chen

Described herein is a soil remediation material capable of absorbing and removing chromium from soil and being recycled so as to enable efficient remediation, repeated recycle, and reduction in remediation cost.

Remediation material for heavy-metal chromium contaminated soil, preparation method and application thereof

The present invention relates to a medium material for eliminating arsenic pollution from groundwater, which is a granular material having an average particle diameter of 1 to 3 cm, prepared from manganese ore, meerschaum, straws, animal excrements, active sludge and active bacterium agent in a mass ratio of 1:0.2&#x2dc;0.5:0.5&#x2dc;1:0.2&#x2dc;0.4:0.2&#x2dc;0.4:0.0005&#x2dc;0.002 via mixing, composting, carbonizing and crushing. The prevent invention also discloses a process for producing the above-mentioned medium material. The medium material of the present invention can eliminate multivalent arsenic from groundwater, has a long service life, and does not cause secondary pollution to groundwater.

Medium material and its preparation method for elimination of arsenic pollution from groundwater

The present invention involves a persulfate-release material used in the filler of permeable reactive barrier (PRB). This material presents double-layered structure characteristic: inner- and outer-layers are consisted of persulfate, cement, sand and water with different mass ratio. Two different types of moulds are used for the regulation of the shape of the two-layer structures, which guarantees the stability and reproducibility of its structures and properties. During the whole released process, the released rate become more uniform and stable by the use of this material. During the whole service period, the change of the released rate is very slow, and the service lifetime can be 1-10 years. This invention can both reduce the initial released rate and improve the later released rate, and thus the whole released rate can be more uniform, which can be an important method to promote the efficiency of the persulfate toward engineering application.

Double-layer persulfate sustained-release material and its preparation method

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Beijing, China

Zhifei Ma