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Method for recovering sludge phosphorus from urban sewage treatment plant

A technology for recycling urban sewage and phosphorus, applied in water/sludge/sewage treatment, sludge treatment, dehydration/drying/concentrated sludge treatment, etc. performance, cost-effective recycling

Active Publication Date: 2009-11-18
RES CENT FOR ECO ENVIRONMENTAL SCI THE CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, due to the organic pollutants, heavy metals and pathogenic bacteria contained in sludge, with the introduction of strict laws and regulations around the world and the improvement of people's awareness of environmental safety, the use of sludge land is becoming more and more restricted.

Method used

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  • Method for recovering sludge phosphorus from urban sewage treatment plant

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] See figure 1 . The return sludge mixture produced by the activated sludge method was collected in Beijing Fangzhuang Sewage Treatment Plant. The sludge concentration after gravity concentration was 6800-8000mg / L, and the PO of the concentrated sludge supernatant was 4 3- -P and total phosphorus (TP) concentrations were 26.2mg / L and 28.6mg / L, respectively. In the sludge phosphorus release step, at room temperature, first pour 200ml of concentrated sludge into a 500ml beaker, place it on a magnetic stirrer, and add sulfuric acid or hydrochloric acid (with a concentration of 2.5 ~5.0mol / L), control the pH of the acidified sludge=1.0~5.0; then put the acidified sludge into the microwave reactor, the microwave frequency is 2.45GHz, and the maximum output power of the magnetron is 1kw, which can be stepless Adjustable, the volume of the chamber is 25L, with a lifting stirring device and a temperature measuring probe, and the opening time of the magnetron is controlled by a...

Embodiment 2

[0023] See figure 1 . The return sludge mixture was collected in Beijing Fangzhuang Sewage Treatment Plant. The sludge concentration after gravity concentration was 6800-8000mg / L, and the PO of the concentrated sludge supernatant was 4 3- -P and total phosphorus (TP) concentrations were 26.2mg / L and 28.6mg / L, respectively. In the sludge phosphorus release unit, at room temperature, first pour 200ml of concentrated sludge into a 500ml beaker, place it on a magnetic stirrer, and add sulfuric acid or hydrochloric acid (with a concentration of 2.5 ~5.0mol / L), control the pH of the acidified sludge=1.0~5.0; then put the acidified sludge into the microwave reactor, the microwave frequency is 2.45GHz, and the maximum output power of the magnetron is 1kw, which can be stepless Adjustable, the volume of the chamber is 25L, with a lifting stirring device and a temperature measuring probe, and the opening time of the magnetron is controlled by a timing device. Under normal pressure, ...

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Abstract

The invention relates to a method for recovering sludge phosphorus from an urban sewage treatment plant, belonging to the technical fields of sludge treatment and resources. The method comprises the following steps: respectively carrying out gravity thickening on sludge releasing sludge phosphorus, sludge phosphorus releasing on sludge after the gravity thickening, solid-liquid separation on sludge after the sludge phosphorus releasing, sludge phosphorus recovery on supernatant fluid rich of phosphorus after the solid-liquid separation, and the like; the sludge phosphorus releasing on sludge after the gravity thickening is realized by treating the sludge by an acidification and normal-pressure microwave radiation combination method; and the sludge phosphorus recovery on supernatant fluid rich of phosphorus after the solid-liquid separation is realized by treating the supernatant fluid rich of phosphorus by a calcium phosphate crystallization process to obtain the deposit containing calcium phosphate crystal, then filtering the deposit containing calcium phosphate crystal and finally recovering the sludge phosphorus. The method not only can efficiently recover the phosphorus in the sludge from the urban sewage treatment plant, but also can achieve the aims of reducing the sludge and improving the depositing performance of the sludge.

Description

technical field [0001] The invention belongs to the technical field of sludge treatment and resource utilization, and in particular relates to a method for recovering phosphorus from urban sewage treatment plant sludge. Background technique [0002] Phosphorus is one of the essential elements for the survival of all living organisms, and plays an important role in cell structure and cell function; phosphorus is also a non-renewable resource, and the reserves of phosphate rock in nature are limited. As we all know, excessive phosphorus discharge is an important cause of water eutrophication. Usually, when the total phosphorus concentration in water reaches 0.02mg / L, the ecological balance of the water environment will be destroyed. In order to effectively curb the eutrophication of water bodies, urban sewage treatment plants need to remove nitrogen and phosphorus in sewage while removing organic pollutants in sewage. Phosphorus in municipal sewage can be removed by chemical ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F11/00C02F11/12C01B25/32
Inventor 魏源送程振敏刘俊新
Owner RES CENT FOR ECO ENVIRONMENTAL SCI THE CHINESE ACAD OF SCI
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