Method for purifying cadmium-containing paddy soil

A cadmium paddy field and soil technology, applied in the restoration of polluted soil, separation method, improvement of process efficiency, etc., can solve problems such as inability to install drainage treatment devices, high cost, and high cost
CN102985191AActive Publication Date: 2013-03-20TAIHEIYO CEMENT CORP
9 Cites 13 Cited by

Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
TAIHEIYO CEMENT CORP
Publication Date
2013-03-20

Smart Images

  • Figure 1
    Figure 1
  • Figure 2
    Figure 2
  • Figure 3
    Figure 3
Patent Text Reader

Abstract

A method for purifying cadmium-containing paddy soil characterized by gathering a detergent drain containing cadmium at one place in a paddy to be washed, subjecting the drain to neutralization or alkali treatment at the place, and accumulating cadmium, in a in-place purification method including washing cadmium-containing paddy soil by a drug solution to extract cadmium, separating the resultant into soil and supernatant by standing, draining the extracted cadmium as supernatant, and further performing a diluent washing with water. The cadmium-containing paddy soil can be efficiently purified.
Need to check novelty before this filing date? Find Prior Art

Description

technical field

[0001] The invention relates to a method for efficiently purifying paddy field soil containing cadmium. Background technique

[0002] CODEX (International Committee on Food Standards established by WHO and FAO) discusses the reference value of Cd concentration in crops, and in July 2006, for rice, a scheme of 0.4 mg / kg was adopted (Non-Patent Document 1). Japan accepted this proposal, and on April 8, 2010, the Cd component standard of rice based on the Food Sanitation Law was revised from less than 1.0 mg / kg to less than 0.4 mg / kg. Furthermore, on June 11, 2010, the requirements for designation of Cd in agricultural land soil pollution countermeasure areas based on the Agricultural Land Soil Pollution Prevention Act were revised from 1 mg or more per 1 kg of brown rice or areas where the risk is significant to 0.4 mg or more areas or areas of significant danger.

[0003] In the future, a considerable area in Japan may be designated as Cd-contaminated agricu...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More