A method for extracting phosphorus from sewage sludge

A sewage sludge and phosphorus element technology, applied in the direction of non-metal elements, chemical instruments and methods, phosphorus compounds, etc., can solve the problem of low recovery rate of phosphorus element

Active Publication Date: 2022-06-17
CHONGQING TECH & BUSINESS UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] The present invention intends to provide a method for extracting phosphorus from sewage sludge to solve the technical problem that the recovery rate of phosphorus is not high

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035] A method for recovering phosphorus from sewage sludge, comprising the steps of:

[0036] S1 dehydration steps:

[0037] The sewage sludge is dewatered to obtain a mud-water mixture with a moisture content between 75-95%. The methods of dehydration treatment include, but are not limited to, methods such as flocculation sedimentation, centrifugation and pressure filtration in the prior art, and the water in sewage sludge can be separated and removed by flocculation sedimentation, centrifugation or pressure filtration. In this embodiment, a filter press method is specifically adopted, and a conventional filter press in the prior art is used to separate the sewage sludge from solid and liquid, and remove most of the water therein. The moisture content of the mud-water mixture obtained in this embodiment is detected as 85%. Sewage sludge can be selected from primary sludge, secondary sludge and the mixture formed by the two. Primary sludge refers to the sediment produced ...

Embodiment 2

[0049] This embodiment is basically the same as Embodiment 1, but some specific parameters are adjusted. The specific differences are:

[0050] S1 dehydration step: the water content of the sludge-water mixture obtained by pressure filtration of sewage sludge is detected to be 75%. Secondary sludge is used for sewage sludge.

[0051] S2 aluminum salt treatment step: the aluminum salt used is aluminum chloride, and the amount of aluminum chloride added is 10% of the dry mass of the mud-water mixture. After adding the aluminum salt, the pH value of the mud-water mixture is adjusted to 3.0, and then A mud-water mixture of aluminum salts was added to the autoclave.

[0052] S3 hydrothermal reaction step: The specific conditions of the hydrothermal reaction used are: temperature 150° C., reaction time: 180 min.

[0053] S4 pickling step: the dilute acid is sulfuric acid, the concentration of sulfuric acid is 1%, and the mass ratio of the dried solid component and sulfuric acid is...

Embodiment 3

[0056] This embodiment is basically the same as Embodiment 1, but some specific parameters are adjusted. The specific differences are:

[0057] S1 dehydration step: the water content of the sludge-water mixture obtained by pressure filtration of the sewage sludge is detected to be 95%. Secondary sludge is used for sewage sludge.

[0058] S2 aluminum salt treatment step: the aluminum salt used is aluminum chloride, and the amount of aluminum chloride added is 0.5% of the dry basis mass of the mud-water mixture. After adding the aluminum salt, the pH value of the mud-water mixture is adjusted to 8.0, and then A mud-water mixture of aluminum salts was added to the autoclave.

[0059] S3 hydrothermal reaction step: The specific conditions of the hydrothermal reaction used are: temperature 350° C., reaction time: 10 min.

[0060] S4 pickling step: the dilute acid is formic acid, the concentration of formic acid is 10%, and the mass ratio of the dried solid component and sulfuric ...

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Abstract

The present invention relates to the field of recycling and utilization of sewage sludge, in particular to a method for extracting phosphorus from sewage sludge, comprising the following steps in sequence: S1 dehydration step: obtaining a mud-water mixture with a water content of 75-95%; S2 aluminum salt Processing steps: adding aluminum salt to the mud-water mixture to obtain a reaction system; S3 hydrothermal reaction step: subjecting the reaction system to a hydrothermal reaction, and then separating solid and liquid to obtain solid components; S4 pickling step: washing the solid with dilute acid Components, collecting leaching solution; S5 phosphorus element recovery step: adding divalent metal ions to the leaching solution to obtain phosphorus-containing solid matter. This scheme can solve the technical problem that the recovery rate of phosphorus element is not high. Using this extraction method, the recovery rate of phosphorus element can reach more than 90%, which has broad application prospects and can solve the crisis of depletion of phosphorus resources in the world. Current strategies for sustainable development.

Description

technical field [0001] The invention relates to the field of sewage sludge regeneration and utilization, in particular to a method for extracting phosphorus elements from sewage sludge. Background technique [0002] The treatment and disposal of sewage sludge and waste is an important problem that plagues the sustainable development of cities. Phosphorus is the main factor causing water eutrophication, and sewage sludge contains a certain amount of phosphorus. Resource utilization of sewage sludge can not only solve the problem of sewage sludge treatment, but also recover certain phosphorus resources. Phosphorus is a kind of non-renewable resource, which plays an important role in the field of agricultural application. At present, phosphorus is mainly extracted from phosphate rock. Therefore, the extraction and recovery of phosphorus from sewage sludge has broad application prospects, which can solve the crisis of depletion of phosphorus resources around the world, which i...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01B25/32C01B25/34
Inventor 齐高相王小波
Owner CHONGQING TECH & BUSINESS UNIV
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