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Method for efficiently utilizing phosphorus in municipal domestic sewage sludge

A technology for urban domestic sewage and phosphorus elements, which is applied in the direction of sludge treatment, pyrolysis sludge treatment, chemical instruments and methods, etc., can solve the limited space available for phosphorus elements (for example, cannot be directly absorbed and utilized by plants, phosphorus elements Low availability, limited separation of phosphorus phase substances, etc., to achieve the effect of improving the utilization efficiency, benefiting plant growth, and high reusability

Pending Publication Date: 2018-12-11
SOUTH UNIVERSITY OF SCIENCE AND TECHNOLOGY OF CHINA
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Problems solved by technology

With this method, not only the amount of acid used is large, but also the efficiency of phosphorus extraction is limited, and the original heavy metals in the sludge limit the separation of phosphorus phase substances.
In addition, most of the phosphorus in the incinerated sludge exists in the form of phosphate (such as calcium phosphate), which leads to a great limitation in the available space of phosphorus (for example, it cannot be directly absorbed by plants). low availability

Method used

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  • Method for efficiently utilizing phosphorus in municipal domestic sewage sludge
  • Method for efficiently utilizing phosphorus in municipal domestic sewage sludge

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Embodiment 1

[0029] This embodiment provides a method for efficient utilization of phosphorus in urban domestic sewage sludge, comprising the following steps:

[0030] Pretreatment of urban domestic sewage sludge: first, the urban domestic sewage sludge is taken from the dewatered sludge of the urban domestic sewage treatment plant (the basic physical and chemical properties of the urban domestic sewage sludge are shown in Table 1), and then the urban domestic sewage sludge is After the sewage sludge is exposed to the sun for 48 hours, the urban domestic sewage sludge is mechanically crushed and screened, and the sludge particles with a mesh number of 200-100 (0.075-0.15mm) are collected, and the sludge particles are sealed and stored . In this embodiment, the urban domestic sewage sludge is sun-dried and mechanically crushed.

[0031] Adding calcium oxide: weighing the above sludge granules, and adding calcium oxide to the sludge granules, the mass ratio of the calcium oxide to the sludg...

Embodiment 2

[0037]The difference between this embodiment and the first embodiment is that in this embodiment, calcium oxide is added to the sludge particles, and the mass ratio of the calcium oxide to the sludge particles is 1:4, and other steps are the same as the first embodiment. The sludge biochar that present embodiment obtains, this sludge biochar is carried out 31 P solid NMR analysis and characterization, obtained the sludge biochar 31 P solid nuclear magnetic resonance spectrum, after performing Gaussian peak splitting on the spectrum, calculate the spectral peak area of ​​each phosphorus source material in the sludge biochar, and obtain the spectral peak area corresponding to the hydroxyl calcium phosphate in the sludge biochar It accounts for 4.17% of the spectral peak area of ​​all phosphorus source substances in the sludge biochar.

Embodiment 3

[0039] The difference between this embodiment and the first embodiment is that in this embodiment, calcium oxide is added to the sludge particles, and the mass ratio of the calcium oxide to the sludge particles is 3:7, and other steps are the same as the first embodiment. The sludge biochar that present embodiment obtains, this sludge biochar is carried out 31 P solid NMR analysis and characterization, obtained the sludge biochar 31 P solid nuclear magnetic resonance spectrum, after performing Gaussian peak splitting on the spectrum, calculate the spectral peak area of ​​each phosphorus source material in the sludge biochar, and obtain the spectral peak area corresponding to the hydroxyl calcium phosphate in the sludge biochar It accounts for 5.28% of the spectral peak area of ​​all phosphorus source substances in the sludge biochar.

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Abstract

The invention relates to the technical field of sludge treatment, in particular to a method for efficiently utilizing phosphorus in municipal domestic sewage sludge. The method comprises the followingsteps: adding calcium oxide in the municipal domestic sewage sludge, and carrying out pyrolytic reaction on the municipal domestic sewage sludge in which the calcium oxide is added, thus obtaining sludge charcoal. The method for efficiently utilizing the phosphorus in the municipal domestic sewage sludge, provided by the invention, is beneficial for increasing the content of available phosphorusin the sludge charcoal and effectively increasing the utilization rate of the phosphorus.

Description

technical field [0001] The invention relates to the technical field of sludge treatment, in particular to a method for efficiently utilizing phosphorus in urban domestic sewage sludge. Background technique [0002] As a by-product of municipal sewage treatment, the production and volume of sludge are increasing day by day. The toxic and harmful substances and heavy metals contained in sludge make the safe disposal of sludge full of urgent needs and challenges. According to the data of "China Environmental Statistical Yearbook", in 2014, the discharge of urban domestic sewage in my country reached 1.2 billion cubic meters, and the generated dewatered sludge (water content 78%) was close to 80 million tons. Traditional sludge disposal methods, such as landfill, incineration, direct land use and other resource utilization, have been unable to meet the current sludge disposal requirements due to the large variation of sludge components and strict environmental standards. The e...

Claims

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Application Information

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IPC IPC(8): C02F11/10C02F11/00
CPCC02F11/00C02F11/10C02F2303/06Y02W10/40
Inventor 张作泰汤斯奇
Owner SOUTH UNIVERSITY OF SCIENCE AND TECHNOLOGY OF CHINA
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