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Method for recovering phosphonium compound from phosphorous excess sludge of urban sewage treatment plant

A technology for excess sludge and urban sewage, applied in phosphorus compounds, water/sludge/sewage treatment, sludge treatment, etc., to achieve the effect of facilitating management and operation, reducing sludge volume and reducing sludge treatment costs

Inactive Publication Date: 2010-02-24
EAST CHINA UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] Since excess sludge often contains harmful impurities such as heavy metals and pathogenic bacteria, there is a risk in the direct recovery of phosphorus from phosphorus-rich excess sludge

Method used

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  • Method for recovering phosphonium compound from phosphorous excess sludge of urban sewage treatment plant
  • Method for recovering phosphonium compound from phosphorous excess sludge of urban sewage treatment plant

Examples

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Embodiment 1

[0034] See attached figure 1 , A method for recovering phosphorus compounds from the phosphorus-rich surplus sludge of a municipal sewage treatment plant, the specific steps are:

[0035] a. Obtain phosphorus-rich surplus sludge from the biological phosphorus removal municipal sewage treatment system, analyze and determine the total phosphorus content and sludge concentration of the remaining sludge, and judge whether the phosphorus content is 4.6-6.8% (calculated as TS), and TS is 4.0~5.9g TS / L; if yes, proceed to step b; the specific analysis and determination process is: take a certain volume of sludge, determine the total phosphorus content in it, and take another volume of sludge to determine the TS content in it. As a result, the total phosphorus content per unit mass of sludge is obtained, that is, the phosphorus content; or the sludge is air-dried, and then a certain quality of sludge is taken to determine the total phosphorus content; the phosphorus content is the sludge ...

Embodiment 2

[0043] See attached figure 2 , A method for recovering phosphorus compounds from the phosphorus-rich surplus sludge of a municipal sewage treatment plant, the specific steps are:

[0044] a. Obtain phosphorus-rich surplus sludge from the biological phosphorus removal municipal sewage treatment system, analyze and determine the total phosphorus content and sludge concentration of the remaining sludge, and judge whether the phosphorus content is 4.6-6.8% (calculated as TS), and TS is 4.0~5.9gTS / L; if yes, go to step b;

[0045] b. Take 300mL of the phosphorus-rich surplus sludge obtained in step a and place it in a 400mL beaker under 150W (0.500W / mL) ultrasonic treatment for 50min, centrifuge (4000rpm, 20min), collect the supernatant and centrifuged solids;

[0046] c. According to the quality of the solids after centrifugation and the volume of the ultrasonic treated sludge, it can be seen that the quality of the sludge after ultrasonic treatment is reduced by 42.6%;

[0047] d. Anal...

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Abstract

The invention relates to a method for recovering a phosphonium compound from phosphorous excess sludge of an urban sewage treatment plant, comprising the following steps: a. obtaining phosphorous excess sludge from a biological dephosphorization urban sewage treatment system; b. carrying out ultrasonic cracking treatment on the excess sludge obtained from the step a to release pnicogen in the sludge, centrifuging the sludge and carrying out solid-liquid separation on the sludge after cracking, collecting supernatant and carrying out the step c or d; c. obtaining a recovered ammoniomagnesium phosphate crystal by adopting a magnesium ammonium phosphate precipitation process; and d. obtaining recovered phosphoric acid calcium salt by adopting a phosphoric acid calcium salt precipitation process. The invention can recovery the phosphonium compound from the excess sludge, reduce the sludge volume and lower the sludge treatment expense and is beneficial to the management operation of the urban sewage treatment plant.

Description

【Technical Field】 [0001] The invention belongs to the technical field of environmental protection, and relates to urban sludge reduction and chemical phosphorus recovery technologies, in particular to a method for recovering phosphorus compounds from phosphorus-rich surplus sludge of a municipal sewage treatment plant. 【Background technique】 [0002] Phosphorus is the source of nutrients for the growth of all things, but it is also a very limited and non-renewable natural mineral resource. Globally, the proven reserves of phosphate rock with existing technology can only last for about 100 years; while the reserves of phosphate rock in China are not enough to be used for 70 years. [0003] Urban sewage contains a large amount of phosphorus, and phosphorus is the main factor that causes eutrophication of water bodies. The current biological phosphorus removal process uses the principle of phosphorus absorption / release of phosphorus-accumulating bacteria to achieve phosphorus in sewag...

Claims

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Application Information

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IPC IPC(8): C01B25/45C01B25/32C02F11/00
Inventor 吕树光王晓霞邱兆富李文贞
Owner EAST CHINA UNIV OF SCI & TECH
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