Method for extracting phosphorus element from sewage sludge

A technology for sewage sludge and phosphorus elements, which can be used in non-metallic elements, chemical instruments and methods, phosphorus compounds, etc., and can solve the problem of low recovery rate of phosphorus elements.

Active Publication Date: 2021-04-20
CHONGQING TECH & BUSINESS UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

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 reclaiming phosphorus from sewage sludge, comprising the steps of:

[0036] S1 dehydration steps:

[0037] The sewage sludge is dehydrated to obtain a mud-water mixture with a water content of 75-95%. The dehydration treatment methods include but are not limited to methods such as flocculation sedimentation, centrifugation and pressure filtration in the prior art, through which the water in the sewage sludge can be separated and removed. In this embodiment, the filter press method is specifically adopted, and the conventional filter press of the prior art is used to separate the solid and liquid from the sewage sludge and remove most of the water. The water 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 a mixture of the two. Primary sludge refers to the sediment produced during the primary treatment of sewage. The second settling sludge (secondeyslu...

Embodiment 2

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

[0050] S1 dehydration step: the water content of the mud-water mixture obtained by pressing the sewage sludge is 75%. Sewage sludge is selected from secondary sedimentation sludge.

[0051] S2 aluminum salt treatment step: the aluminum salt used is aluminum chloride, and the addition amount of aluminum chloride is 10% of the dry weight of mud-water mixture, after adding aluminum salt, the pH value of mud-water mixture is adjusted to 3.0, then contains The mud-water mixture of aluminum salt is added to the autoclave.

[0052] S3 hydrothermal reaction step: the specific hydrothermal reaction conditions 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 to sulfuric acid is 1:30. T...

Embodiment 3

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

[0057] S1 dehydration step: the water content of the mud-water mixture obtained by press-filtering the sewage sludge is 95%. Sewage sludge is selected from secondary sedimentation sludge.

[0058] S2 aluminum salt treatment step: the aluminum salt used is aluminum chloride, and the addition amount of aluminum chloride is 0.5% of the dry weight of mud-water mixture, after adding aluminum salt, the pH value of mud-water mixture is adjusted to 8.0, then contains The mud-water mixture of aluminum salt is added to the autoclave.

[0059] S3 hydrothermal reaction step: the specific hydrothermal reaction conditions 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 to sulfuric acid is 1:6....

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Abstract

The invention relates to the field of sewage sludge recycling, in particular to a method for extracting phosphorus from sewage sludge. The method sequentially comprises the following steps of: S1, a dehydration step: obtaining a mud-water mixture with the water content of 75-95%; S2, an aluminum salt treatment step: adding an aluminum salt into the mud-water mixture to obtain a reaction system; S3, a hydrothermal reaction step: carrying out hydrothermal reaction on the reaction system, and then carrying out solid-liquid separation to obtain a solid component; S4, an acid pickling step: performing dilute acid pickling on the solid component and collecting leachate; and S5, a phosphorus element recovery step: adding divalent metal ions into the leachate to obtain a phosphorus-containing solid substance. With the method provided by the technical schemes of the invention, the technical problem that the recovery rate of the phosphorus element is not high can be solved; the recovery rate of the phosphorus element can reach 90% or above through the extraction method; the method has a wide application prospect; the problem that phosphorus resources face an exhaustion crisis in the world can be solved; and the method caters to the current advocated sustainable development strategy.

Description

technical field [0001] The invention relates to the field of recycling and utilization of sewage sludge, in particular to a method for extracting phosphorus from sewage sludge. Background technique [0002] The treatment and disposal of sewage sludge waste is an important problem that plagues the sustainable development of cities. Phosphorus is the main factor causing eutrophication of water body, and sewage sludge contains a certain amount of phosphorus element. The resource utilization of sewage sludge can not only solve the problem of sewage sludge treatment, but also recover certain phosphorus resources. Phosphorus is a non-renewable resource that plays a pivotal role in the field of agricultural applications. At present, phosphorus is mainly extracted from phosphate rock. With the accelerated mining of phosphate rock resources, phosphate rock resources are becoming increasingly tense. Therefore, the extraction and recovery of phosphorus from sewage sludge has broad ap...

Claims

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Application Information

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