SLUDGE PROCESSING METHOD, SLUDGE PROCESSING SYSTEM, AND METHOD FOR MANUFACTURING ADSORBENT
|Posted date||Jan 29, 2020|
|International application number||2019JP013523|
|International publication number||WO 2019189549|
|Date of international filing||Mar 28, 2019|
|Date of international publication||Oct 3, 2019|
|Title||SLUDGE PROCESSING METHOD, SLUDGE PROCESSING SYSTEM, AND METHOD FOR MANUFACTURING ADSORBENT|
|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||
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||
|IPC(International Patent Classification)|
Contact Information for " SLUDGE PROCESSING METHOD, SLUDGE PROCESSING SYSTEM, AND METHOD FOR MANUFACTURING ADSORBENT "
- Niigata University (In Japanese)研究支援部産学連携課
- URL: https://www.niigata-u.ac.jp/
- Address: 8050,Ikarashi 2no-cho,Nishi-Ku,Niigata,Japan , 950-2181
- Phone: 81-25-262-7554
- Fax: 81-25-262-7513