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Method for recovering struvite from municipal sludge

A technology for municipal sludge and struvite, applied in sludge treatment, chemical instruments and methods, water/sludge/sewage treatment, etc., can solve problems such as impact on the purity of struvite recovery, and save infrastructure and equipment investment , The process is simple, which is conducive to the effect of popularization and application

Active Publication Date: 2021-04-06
湖南鑫远环境科技股份有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005]The recovery of phosphorus from the sludge liquid phase by means of struvite precipitation has high stability, simple operation method, and high plant availability, which is comparable to other recovery methods. Compared with the characteristics of economic cost, however, the recovery rate of struvite phosphorus from the sludge liquid phase is only about 40-60%. The effect of ions is greater

Method used

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Embodiment 1

[0035] The present embodiment provides a kind of method that reclaims struvite from municipal sludge, comprises the following steps:

[0036] S1: Solid-liquid separation of municipal sludge to obtain filtrate and filter residue;

[0037] S2: performing secondary filtration on the filtrate obtained in step S1 to obtain a secondary filtrate;

[0038] S3: Mix the secondary filtrate obtained in step S2 with a magnesium source and a composite metal complexing agent, and perform struvite reaction treatment to obtain struvite particles.

[0039] In step S1, the equipment used for the solid-liquid separation is a membrane filter press.

[0040] In step S2, after secondary filtration, the suspended matter content of the secondary filtrate is ≤5mg / L.

[0041] In step S3, when the secondary filtrate is mixed with the magnesium source, the molar ratio of magnesium to phosphorus is 0.8:1.

[0042] In step S3, when the secondary filtrate is mixed with the composite metal complexing agent...

Embodiment 2

[0045] The present embodiment provides a kind of method that reclaims struvite from municipal sludge, comprises the following steps:

[0046] S1: Concentrate the municipal sludge until the water content of the sludge is less than 30%.

[0047] S2: Separating the municipal sludge from solid to liquid to obtain filtrate and filter residue;

[0048] S3: performing secondary filtration on the filtrate obtained in step S1 to obtain a secondary filtrate;

[0049] S4: Mix the secondary filtrate obtained in step S2 with a magnesium source and a composite metal complexing agent, and perform struvite reaction treatment to obtain struvite particles.

[0050] In step S2, the equipment used for the solid-liquid separation is a membrane filter press.

[0051] In step S3, after secondary filtration, the suspended matter content of the secondary filtrate is ≤5mg / L.

[0052] In step S4, when the secondary filtrate is mixed with the magnesium source, the molar ratio of magnesium to phosphoru...

Embodiment 3

[0056] The present embodiment provides a kind of method that reclaims struvite from municipal sludge, comprises the following steps:

[0057] S1: Perform ultrasonic treatment on municipal sludge, the acoustic energy density of ultrasonic treatment is 1.0W / mL, and the ultrasonic treatment time is 35min;

[0058] S2: Concentrate the municipal sludge until the water content of the sludge is less than 30%.

[0059] S3: Solid-liquid separation of municipal sludge to obtain filtrate and filter residue;

[0060] S4: performing secondary filtration on the filtrate obtained in step S1 to obtain a secondary filtrate;

[0061] S5: Mix the secondary filtrate obtained in step S2 with a magnesium source and a composite metal complexing agent, and perform struvite reaction treatment to obtain struvite particles.

[0062] In step S3, the equipment used for the solid-liquid separation is a diaphragm filter press.

[0063] In step S4, after secondary filtration, the suspended matter content of...

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Abstract

The invention provides a method for recovering struvite from municipal sludge, which comprises the following steps: carrying out ultrasonic treatment on the municipal sludge to break cells while breaking the sludge, thereby promoting the release of intracellular moisture and PO4<3-> into the liquid phase; secondly, most of solid TP in the sludge can be promoted to be transferred into a liquid phase in a PO4<3-> form, the phosphorus content in the liquid phase after solid-liquid separation of the sludge can be increased, and the follow-up improvement of the struvite extraction recovery rate is facilitated; thirdly, the municipal sludge is subjected to ultrasonic treatment, no extra reagent needs to be added, the treatment cost is low, the process is simple, expensive equipment investment is not needed, capital construction and equipment investment are saved, and application and popularization are facilitated.

Description

technical field [0001] The invention belongs to the technical field of struvite recovery and treatment, in particular to a method for recovering struvite from municipal sludge. Background technique [0002] The chemical name of struvite is magnesium ammonium phosphate, and the chemical formula is MgNH 4 PO 4 ·6H 2 O with 12% N and 52% P 2 o 5 . The plant availability of struvite is as high as 70-100%, which is better than most mineral phosphate fertilizers. It is a kind of slow-release fertilizer with excellent effect, insoluble in water, low in leaching, not easy to lose, and has little impact on the water environment. [0003] Phosphorus is an essential nutrient for organisms. Due to the rapid growth of the global population, there are very few phosphate rocks available at present. In addition, the discharge of phosphorus-containing wastes will also cause eutrophication of water bodies. Therefore, recovering phosphorus resources from various phosphorus-rich wastes ha...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F11/15C02F11/122C02F9/04C01B25/45C05B9/00
CPCC02F11/15C02F11/122C02F1/001C02F1/56C01B25/451C05B9/00C01P2006/80
Inventor 易世雄
Owner 湖南鑫远环境科技股份有限公司
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