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Method of formation/recovery of magnesium ammonium phosphate and apparatus therefor

A treatment method and sludge technology, applied in sludge treatment, biological sludge treatment, water/sludge/sewage treatment, etc., to achieve the effect of avoiding fly ash, reducing sludge, and maintaining easy management

Active Publication Date: 2008-08-20
EBARA ENG SERVICE
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0011] However, these techniques have the advantages of reducing the cost of chemicals and not requiring a special reactor, but they have a problem that the reaction time takes as long as about 25 days.

Method used

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  • Method of formation/recovery of magnesium ammonium phosphate and apparatus therefor
  • Method of formation/recovery of magnesium ammonium phosphate and apparatus therefor
  • Method of formation/recovery of magnesium ammonium phosphate and apparatus therefor

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0065] This embodiment is an experimental example obtained by using the sludge from the A sewage treatment plant and using the pilot test device, and the flow process is the same as that shown previously. figure 1 The process is the same. A sewage treatment plant adopts activated sludge treatment using anaerobic anaerobic aerobic method. In this example, the primary sedimentation sludge and excess sludge taken from A sewage treatment plant were mixed at a ratio of about 1:1, and concentrated by a centrifugal thickener. The thickened sludge is introduced into the phosphoric acid and ammonium ion elution and MAP production tank 22 . The bottom of the tank 22 is hopper-shaped, and the inside of the tank is stirred by a stirrer, and the MAP particles at the bottom of the tank flow through the entire tank by continuously circulating the sludge stirred from the bottom of the tank to the upper part of the tank. Other conditions of the tank 22 were set as follows: hydraulic residenc...

Embodiment 2

[0073] Next, an example of the operation result of the experimental equipment of another form in which the wastewater treatment technology of the present invention is actually applied will be described. However, the present invention is not limited to this example. This embodiment is an experimental example obtained by using the sludge of A food wastewater treatment plant and utilizing a pilot test device, and the flow process is the same as that previously shown figure 2 The process is the same. A treatment plant adopts activated sludge treatment by anaerobic anaerobic aerobic method as biological water treatment process 12 . In this example, the primary sedimentation sludge and excess sludge taken from A treatment plant were mixed at a ratio of about 2:1, and concentrated using a gravity thickener. The thickened sludge is introduced into the phosphoric acid and ammonium ion elution and MAP production tank 22 . The tank 22 is provided with an ultrasonic treatment device a...

Embodiment 3

[0082] Moreover, an example of the operation result of the experimental plant of another form which actually applied the wastewater treatment technique of this invention is demonstrated. However, the present invention is not limited to this Example.

[0083] This example is an experimental example obtained from an in-use test device using sludge from a wastewater treatment plant of a food factory, and the flow is the same as that shown previously. figure 2 The process is the same. The wastewater treatment plant of Factory A adopts activated sludge treatment using anaerobic anaerobic aerobic method. In this example, the primary sedimentation sludge and excess sludge collected from the treatment plant of A factory were mixed at about 2:1, and concentrated by a gravity thickener. Thickened sludge is first introduced into the ozone treatment tank (in figure 2 (not shown in the figure), after the solubilization treatment by ozone was carried out, phosphoric acid and ammonium i...

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Abstract

A method and apparatus in which in a biological treating system for organic wastewater, not only is phosphorus, etc. efficiently recovered as MAP crystal from a wastewater containing organic matter, phosphorus and nitrogen but also the biological denitrification / dephosphorization treatment capability is strikingly improved. There is provided a method of treating sludge generated in the process for biological treatment of organic wastewater utilizing microbial metabolism, characterized in that a biological treatment composed mainly of acid fermentation by facultative anaerobes is carried out with the sludge to thereby leach phosphate ion and ammonium ion from the sludge; a magnesium source is added to the sludge to thereby form grains of magnesium ammonium phosphate from the leached phosphate ion and ammonium ion; and grains of magnesium ammonium phosphate are separated from the sludge containing formed grains of magnesium ammonium phosphate. Further, there is provided an apparatus for carrying out the method.

Description

technical field [0001] The present invention relates to a method and a treatment device for treating sludge generated in a biological treatment process of organic wastewater utilizing microbial metabolism, and more specifically relates to the use of phosphorus and the like as phosphoric acid from wastewater containing phosphorus and nitrogen. Magnesium Ammonium Phosphate: the initials are also called "MAP"; the chemical formula is MgNH 4 PO 4 ·6H 2 O) crystallization effectively reclaims the method and device. Background technique [0002] As we enter the 21st century, wastewater treatment technologies are not simply about purifying water, but the need for recycling purified water as a resource is increasing. Among them, technologies for removing and recovering phosphorus from organic wastewater such as sewage have been developed. [0003] Phosphorus removal method has been developed and applied by chemical coagulation precipitation method, and has achieved practical res...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C02F11/14C02F11/04C02F3/12C02F3/34C02F3/30C02F11/143
CPCC02F11/04C05B7/00C02F3/308C02F11/14C02F11/143C05B9/00
Inventor 萩野隆生府中裕一池田伦子
Owner EBARA ENG SERVICE
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