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Title:
COMBINED SOIL WASHING DESORPTION METHOD AND DEVICE
Document Type and Number:
WIPO Patent Application WO/2017/071104
Kind Code:
A1
Abstract:
Provided are a combined soil washing desorption method and device. The method is as follows: polluted soil is sprayed and sieved with a wet multistage vibrating sieve (3) to remove large particles of stones or coarse sand that can be directly backfilled; washing desorption treatment is carried out on a fine soil particle suspension, and same is subjected to cyclones (10-1,10-2,10-3) connected in series and respectively equipped with solid-liquid mixers (8-1,8-2) and a micro rotational flow sequencer (9-1) in order to achieve the separation of clay pollutants of small particle size; washing desorption treatment and cyclone separation are carried out on the remaining sandy soil of intermediate particle size, wherein the recycling of a washing liquid is achieved by a precision filter (12-1); and washing treatment using clear water and cyclone separation are carried out on the soil after filtration, and finally, after dehydration through a centrifugal machine (13), the deep separation of waste water and soil particles is finally achieved, thus achieving the purposes of backfilling soil, recycling tap water and recycling a washing agent. The device parameters can be adjusted and optimized according to actual conditions, thereby effectively removing pollutants containing heavy metals, pesticides, etc., and overcoming the deficiency that current soil washing cannot be industrialized.

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Inventors:
YANG QIANG (CN)
SUN RONGJIANG (CN)
LIU YIQIAN (CN)
LIN KUANGFEI (CN)
YANG XUEJING (CN)
Application Number:
PCT/CN2016/000013
Publication Date:
May 04, 2017
Filing Date:
January 11, 2016
Export Citation:
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Assignee:
UNIV EAST CHINA SCIENCE & TECH (CN)
International Classes:
B09C1/00; B09C1/02
Foreign References:
CN105170630A2015-12-23
CN103286122A2013-09-11
CN104889149A2015-09-09
JP2006116397A2006-05-11
KR101167479B12012-07-27
CN1660515A2005-08-31
Attorney, Agent or Firm:
SHANGHAI XIN TIAN PATENT AGENCY CO., LTD. (CN)
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