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SLUDGE PROCESSING METHOD, SLUDGE PROCESSING SYSTEM, AND METHOD FOR MANUFACTURING ADSORBENT meetings

Foreign code F200009999
File No. (S2018-0293-N0)
Posted date Jan 29, 2020
Country WIPO
International application number 2019JP013523
International publication number WO 2019189549
Date of international filing Mar 28, 2019
Date of international publication Oct 3, 2019
Priority data
  • P2018-066821 (Mar 30, 2018) JP
Title SLUDGE PROCESSING METHOD, SLUDGE PROCESSING SYSTEM, AND METHOD FOR MANUFACTURING ADSORBENT meetings
Abstract This sludge processing method is characterized by including: an adsorption step of bringing a sludge digestion liquid into contact with an adsorbent to remove, by adsorption into the adsorbent, at least a portion of a phosphorous component contained in the sludge digestion liquid; and a combustion step of burning digested sludge obtained by removing at least said portion of the phosphorous component from the digestion liquid in the adsorption step. The present invention makes it possible to provide a sludge processing method and processing system capable of reducing the amount of the phosphorous component vaporized during combustion, and suppressing adverse effects on a combustion furnace.
Outline of related art and contending technology BACKGROUND ART
Sewage treatment water discharged from the sludge for the treatment of sewage sludge or the like, restrictions on landfill disposal site to prevent the environmental pollution problem of depletion or the like, many combustion of the combustion furnace is employed.
Sewage sludge digestion sludge dewatering processing (hereinafter, also referred to as simply 'sludge') is, the high concentration phosphorus (for example, about 30% in terms of ash) is included. For this reason, when the combustion of the sludge, the sludge contained in the evaporation of phosphorus component, such as a wall of the combustion furnace as the phosphate compound is attached to, or damage to the furnace wall of the combustion furnace, or clog the exhaust pipe, the heat exchange tube or such a problem that corrosion occurs.
Therefore, in the sludge, the sludge in order to reduce the amount of phosphorus contained in the research has been carried out.
As the techniques for removing the phosphorus, magnesium ammonium phosphate (MAP) using the known method, such a method, an ammonia component is required, and the problem of the length of reaction time, the above-described problem cannot be sufficiently solved.
In addition, the fine particles in the sludge, the aggregating agent to the suspension as a collection or phosphorus, polyaluminum chloride (PAC), ferric sulfates are known (for example Non-Patent Document 1).
However, aluminum chloride, ferric sulfate in the case of using polysilicon, the problem of adverse effects on the combustion furnace or the like cannot be sufficiently solved. In particular, is subjected to digestion sludge relatively high phosphorus content (e.g., fly ash in the content of 10 mass % content of equal to or more than) if included, the above problem occurs more remarkably. Also, these are, expensive, and the problem of cost increase of the amount of ash was also a problem.
On the other hand, the water used in the factory or mine, many heavy metal contaminants such as can be included. Such contamination in the case where the water is drained, it is necessary to sufficiently remove the contaminants.
In addition, such as well water of the contaminated soil contaminants such as heavy metal to be included, such as drinking water in the case of using as a domestic water, it is necessary to sufficiently remove contaminants.
In the related art, the removal of the contaminants, which is used for a large amount of adsorbent (for example, see Patent Document 1). However, in an alkaline solution (for example, hydrogen ion exponent (pH) is 10 or more in the liquid) is performed in the processing by the adsorbent, heavy metals cannot be adsorbed sufficiently, due to the heavy metal adsorption or re-dissolved, it is difficult to sufficiently remove the contaminants was.
Scope of claims (In Japanese)[請求項1]
 汚泥の消化液を吸着剤と接触させ、前記消化液に含まれるリン成分の少なくとも一部を、前記吸着剤に吸着させて除去する吸着工程と、
 前記吸着工程で前記消化液からリン成分の少なくとも一部が除去されて得られる消化汚泥を燃焼する燃焼工程とを有することを特徴とする汚泥の処理方法。

[請求項2]
 前記吸着工程において、前記吸着剤としてドロマイト類を用いる請求項1に記載の汚泥の処理方法。

[請求項3]
 前記ドロマイト類は、水酸化ドロマイトである請求項2に記載の汚泥の処理方法。

[請求項4]
 前記ドロマイト類は、ドロマイトである請求項2に記載の汚泥の処理方法。

[請求項5]
 前記吸着工程をpHが3以上13以下の条件で行う請求項1ないし4のいずれか1項に記載の汚泥の処理方法。

[請求項6]
 前記燃焼工程における燃焼温度は、500℃以上1500℃以下である請求項1ないし5のいずれか1項に記載の汚泥の処理方法。

[請求項7]
 汚泥の消化液を吸着剤と接触させ、前記消化液に含まれるリン成分の少なくとも一部を、前記吸着剤に吸着させて除去する吸着処理部と、
 前記吸着処理部で前記消化液からリン成分の少なくとも一部が除去されて得られる消化汚泥を燃焼する燃焼炉とを備えることを特徴とする汚泥の処理システム。

[請求項8]
 汚泥の消化液とドロマイト類とを接触させ、前記消化液に含まれるリン成分の少なくとも一部を、前記ドロマイト類に吸着させる吸着工程と、
 前記消化液と接触させた前記ドロマイト類を焼成する焼成工程とを有することを特徴とする吸着剤の製造方法。
  • Applicant
  • ※All designated countries except for US in the data before July 2012
  • NIIGATA UNIVERSITY
  • Inventor
  • KIM, Hee Joon
IPC(International Patent Classification)
Specified countries National States: AE AG AL AM AO AT AU AZ BA BB BG BH BN BR BW BY BZ CA CH CL CN CO CR CU CZ DE DJ DK DM DO DZ EC EE EG ES FI GB GD GE GH GM GT HN HR HU ID IL IN IR IS JO JP KE KG KH KN KP KR KW KZ LA LC LK LR LS LU LY MA MD ME MG MK MN MW MX MY MZ NA NG NI NO NZ OM PA PE PG PH PL PT QA RO RS RU RW SA SC SD SE SG SK SL SM ST SV SY TH TJ TM TN TR TT TZ UA UG US UZ VC VN ZA ZM ZW
ARIPO: BW GH GM KE LR LS MW MZ NA RW SD SL SZ TZ UG ZM ZW
EAPO: AM AZ BY KG KZ RU TJ TM
EPO: AL AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HR HU IE IS IT LT LU LV MC MK MT NL NO PL PT RO RS SE SI SK SM TR
OAPI: BF BJ CF CG CI CM GA GN GQ GW KM ML MR NE SN ST TD TG
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