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A method and system for recovering struvite from sludge

A struvite and sludge technology, applied in sludge treatment, chemical instruments and methods, water/sludge/sewage treatment, etc., can solve the problems of insufficient release and extraction of phosphorus, waste of phosphorus resources, etc., and achieve The effect of reducing sludge, increasing phosphorus content, and reducing return load

Active Publication Date: 2018-10-09
WUXI HUAGUANG BOILER
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0008] In view of the above-mentioned problems, the present invention provides a method for recovering struvite from sludge, which can solve the problem that a large amount of phosphorus is stored in the solid phase in the existing sludge treatment process and cannot be fully released and extracted, which leads to the shortage of phosphorus resources. The problem of a large amount of waste; for this reason, the present invention also provides a system for reclaiming struvite from sludge

Method used

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  • A method and system for recovering struvite from sludge
  • A method and system for recovering struvite from sludge

Examples

Experimental program
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Effect test

Embodiment 1

[0044] The concentrated sludge with a water content of 97% in the sludge thickening tank 10 is pumped into the ultrasonic reaction tank 20 by the feed port 21 through the discharge port 11, and the ultrasonic generating device 23 and the stirring device 24 are opened to enter the ultrasonic reaction tank 20. The concentrated sludge is subjected to ultrasonic treatment, the ultrasonic power of the ultrasonic generating device 23 is set to 0.4W / mL, and the ultrasonic treatment time is 60 minutes;

[0045] The ultrasonically treated concentrated sludge is discharged from the ultrasonic reaction tank 20 from the discharge port 22 and pumped into the diaphragm plate frame filter press 30 through the feed port 31 for solid-liquid separation treatment, and the feed pressure is controlled to be 1.0Mpa. The feeding time is 1.5 hours, the pressing pressure is controlled at 1.6Mpa, and the pressing time is 1.0 hours. After the press filtration and dehydration treatment, the solid phase in...

Embodiment 2

[0049] The difference between Embodiment 2 and Embodiment 1 is that the ultrasonic power of the ultrasonic generating device 23 is set to 0.2W / mL, the ultrasonic treatment time is 75 minutes, and the struvite is added in a ratio of Mg:P molar ratio of 1.5:1 during the recovery process of the struvite reaction. MgCl 2 And it is distributed into the stainless steel mesh 482 in the stainless steel reaction liner 481 through the liquid distributor 47 .

[0050] The difference between Embodiment 3 and Embodiment 1 and 2 is that the ultrasonic power of the ultrasonic generating device 23 is set to 0.5W / mL, the ultrasonic treatment time is 90 minutes, and the molar ratio of Mg:P is 1.3:1 during the struvite reaction recovery process. Add MgCl 2 And it is distributed into the stainless steel mesh 482 in the stainless steel reaction liner 481 through the liquid distributor 47 .

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Abstract

The invention provides a method and a system for recycling struvite from sludge, and solves a problem that lots of phosphorus resources are wasted as a large number of phosphorus elements exist in a solid phase and cannot be fully released or extracted during sludge treatment. The method comprises the following steps: firstly, performing ultrasonic treatment on thick sludge in an ultrasonic reaction tank while stirring; secondly, performing solid-liquid separation treatment on the thick sludge subjected to ultrasonic treatment through a diaphragm plate-and-frame filter press to obtain a dehydrated mud cake and a filtrate, and conveying the dehydrated mud cake out to be processed; thirdly, performing secondary filtration on the filtrate through a filtering device to obtain a secondary filtrate, and mixing the secondary filtrate with a magnesium source according to a molar ratio of Mg: P of being (1.3-1.5): 1 in a struvite reaction recovery device for struvite reaction treatment, wherein the reaction treating time is controlled to be 2 hours, and in the struvite reaction treatment process, struvite particles are precipitated out from the secondary filtrate; finally, collecting the precipitated out struvite particles after the struvite reaction treatment, allowing the secondary filtrate to flow back to a sewage treatment plant to be treated further.

Description

technical field [0001] The invention relates to the technical field of sludge treatment, in particular to a method and system for recovering struvite from sludge. Background technique [0002] In the municipal sewage treatment process based on the activated sludge process technology system, about 80% of TP in the municipal sewage will eventually be transferred to the remaining municipal sludge. At present, plate and frame filter press deep dehydration has been widely used in the industry as an important sludge reduction treatment method. However, due to the high concentration of phosphorus in the sludge dewatering filtrate, if the sludge dewatering filtrate is directly returned, it will lead to sewage treatment. The internal return load of the plant is relatively high; in addition, lime-based chemicals are often used to condition the sludge in the front stage of deep dehydration of the diaphragm plate and frame, resulting in the phosphorus in the sludge being mostly stored i...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C02F11/00C02F11/12C01B25/45C05B7/00
CPCC01B25/451C02F11/00C02F11/12C02F11/122C02F2101/105C05B7/00
Inventor 李冲李雄伟王红军薛一帆张蕾
Owner WUXI HUAGUANG BOILER
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