TWI690503B - Manufacturing method of lightweight construction materials using organic sludge waste - Google Patents

Abstract

A manufacturing method of lightweight construction materials using organic sludge waste, comprising the following steps: (a) hydrothermal liquefying organic sludge to form a mixture comprising ash, wherein said organic sludge has an organic content ranging from greater than 40% by weight and water content ranges from 30 to 90% by weight; (b) separating said mixture to separate said ash from said mixture; and (c) sintering said ash separated from said mixture, wherein the temperature range of said sintering treatment is from 800 to 1500 °C. The method of this invention effectively reduces and recycles organic sludge, and converts organic sludge with high water content into light aggregate with valuable value.

Description

Method for preparing light weight bone material with organic sludge

The invention relates to a method for preparing lightweight bone materials, in particular to a method for preparing lightweight bone materials using organic sludge.

Turning waste into valuable resources is the current development trend. Among them, organic sludge is not easy to handle due to its high water content, and the treatment cost is high. Therefore, resources are invested in the world to develop high-moisture content organic sludge and reduce the treatment cost.

For example, Chinese patent CN100584794C provides a method for preparing ceramsite light aggregate using sludge, which includes the following steps: thermally drying a dehydrated cake with a moisture content of 75 to 85% to obtain dry sludge, followed by crushing and sieving the dry sludge And then add fly ash and stir to obtain mixed materials. Using a powder tableting machine, the mixed material is extruded to form a ceramsite light aggregate blank. Then, the ceramsite light aggregate blank is heated to 350° C. and stayed for 20 minutes to allow the organic matter to fully evaporate. It is then baked at 1080 to 1100°C for 30 minutes, and finally naturally cooled to room temperature to obtain ceramsite light aggregate.

Therefore, the object of the present invention is to provide a method for preparing a lightweight aggregate that can solve at least one problem of the prior art.

Therefore, the present invention provides a method for preparing lightweight aggregate using organic sludge, which includes the following steps: (a) subjecting the organic sludge to hydrothermal liquefaction treatment to form a mixture including ash, wherein the organic content of the organic sludge ranges Is greater than 40wt% and has a moisture content ranging from 30 to 90wt%; (b) separating the mixture to separate ash from the mixture; and (c) sintering the ash separated from the mixture, wherein The temperature range of the sintering treatment is 800 to 1500°C.

The effect of the present invention is that the method of preparing light weight aggregates using organic sludge of the present invention effectively reduces and recycles the organic sludge through the steps (a) to (c), and transforms the organic sludge with high water content Into lightweight aggregate with valuable value.

The method for preparing lightweight bone material using organic sludge in the present invention includes steps (a) to (c), and each step will be described in detail below.

In this step (a), the organic sludge is hydrothermally liquefied to form a mixture including solid ash and liquid biomass oil. Wherein, the content of organic matter in the organic sludge is greater than 40wt%, and the moisture content range is 30 to 90wt%. The source of the organic sludge is, for example but not limited to, organic sludge from the food industry, leather industry, sewers or waterworks.

The liquefied hydrothermal treatment (hydrothermal liquefaction, HTL) transmitted through the high temperature high pressure water has a high ion product ^{([H +] × [OH} -]), thus having a catalytic action to promote the organic sludge is organic (e.g. polysaccharides, Proteins, fats, etc.) undergo small molecule formation, hydrolysis, deoxygenation, and polymerization to form this crude oil. In some embodiments of the present invention, the temperature range of the hydrothermal liquefaction treatment is 320 to 400° C., the pressure range is 10 to 22 MPa, and the time range is 5 to 60 minutes.

In some embodiments of the present invention, the organic sludge is subjected to the hydrothermal liquefaction treatment in the presence of a catalyst. The catalyst is for example but not limited to potassium carbonate (K ₂ CO ₃ ), sodium carbonate (Na ₂ CO ₃ ), potassium hydroxide (KOH), sodium hydroxide (NaOH) or acetic acid. The amount of the catalyst is not particularly limited, and can be freely adjusted according to the specific type and amount of organic sludge.

The ash content of the mixture is derived from the catalyst, the original inorganic substances in the organic sludge, the inorganic substances generated after the hydrothermal liquefaction treatment, or any combination of the above.

In this step (b), the mixture is subjected to separation treatment to separate ash from the mixture. The specific implementation of the separation process is a solid-liquid separation process. The specific implementation of the solid-liquid separation process is not particularly limited, such as, but not limited to, centrifugation, distillation, flash evaporation, gravity sorting, or natural sedimentation. In some embodiments of the present invention, in order to more easily separate ash from the mixture, the temperature range of the separation process is 100 to 200°C.

In this step (c), the ash separated from the mixture is sintered. In some embodiments of the present invention, the temperature range of the sintering process is 800 to 1500°C, the time range of the sintering process is 60 to 300 minutes, and the pressure range of the sintering process is normal pressure. The equipment used in the sintering process is not particularly limited, such as but not limited to high temperature furnace, rotary kiln, cement kiln or brick kiln.

In some embodiments of the present invention, in order to cope with the subsequent application of lightweight aggregates, the method for preparing lightweight aggregates using organic sludge of the present invention optionally further includes the following steps: The ash is granulated to make the ash into a rough material, and then the rough material is subjected to the sintering process. The equipment used in the granulation process is, for example, but not limited to, a powder tablet press, a forming embryo machine, and the like. The pressure, temperature and time of the granulation process, the shape, density and size of the rough material are not particularly limited, for example, it may be adjusted according to the subsequent application of the lightweight aggregate.

In other embodiments of the present invention, in order to respond to the subsequent application of lightweight aggregate, the method for preparing lightweight aggregate using organic sludge of the present invention optionally further includes the following steps: separating the additive from the mixture The resulting ash is mixed to form a composition, and the composition is granulated to form a rough stock, and then the rough stock is subjected to the sintering process. The type and amount of the additive are not particularly limited, and can be adjusted according to the subsequent application of the lightweight aggregate. The additive is, for example but not limited to, coal ash, zeolite, clay, loess, etc. The granulation process is as described above and will not be repeated here.

The subsequent application of the lightweight aggregate produced by the method for preparing lightweight aggregate using organic sludge in the present invention is, for example, but not limited to, artificial bricks, non-structural walls, road asphalt or hollow bricks.

The present invention will be further described in the following embodiments, but it should be understood that this embodiment is for illustrative purposes only, and should not be construed as a limitation of the implementation of the present invention.

[Example 1]

(a) In the presence of a catalyst (a type of potassium carbonate with an amount of 1 gram), 700 grams of organic sludge (sourced from a sewage treatment plant with a moisture content of about 82wt% and an organic matter content of about 55wt%) were carried out Hydrothermal liquefaction treatment (pressure 22 MPa, temperature 380° C., time 15 minutes) to form a mixture including raw oil and ash.

(b) Using a solid-liquid separation device (specifically a flash tank), the mixture is subjected to separation treatment (pressure 3 MPa, temperature 150°C, time 60 minutes) to separate ash from the mixture. Among them, the X-ray Fluorescence Spectrometer (X-ray Fluorescence Spectrometer, manufacturer model Hitachi EA 8000) was used to analyze the ash separated from the mixture, and the analysis results are shown in the following table:

(c) Using a sintering device (specifically a high-temperature furnace), the ash separated from the mixture is sintered (pressure is normal pressure, temperature is 1200 ℃, time is 180 minutes) to obtain a lightweight aggregate (such as (Figure 1).

In summary, the method of preparing light weight aggregates using organic sludge of the present invention can effectively reduce and recycle organic sludge, and convert high-moisture content organic sludge into light weight aggregates with useful value, and The organic matter in the organic sludge is converted into bio-oil, so it can indeed achieve the purpose of the invention.

However, the above are only examples of the present invention, and the scope of implementation of the present invention cannot be limited by this, any simple equivalent changes and modifications made according to the scope of the patent application of the present invention and the content of the patent specification are still classified as Within the scope of the invention patent.

Other features and effects of the present invention will be clearly presented in the embodiment with reference to the drawings, in which: 　 FIG. 1 is an example of a method for preparing light weight bone material using organic sludge according to the present invention 1 .

Claims (6)

A method for preparing light weight aggregates using organic sludge, comprising the following steps: (a) The organic sludge is hydrothermally liquefied to form a mixture including ash, wherein the organic matter content of the organic sludge is greater than 40wt% And a moisture content ranging from 30 to 90 wt%; (b) separating the mixture to separate ash from the mixture; and (c) sintering the ash separated from the mixture, wherein the sintering The temperature range is from 800 to 1500°C. The method for preparing lightweight aggregate using organic sludge as described in claim 1, wherein in the step (c), the time range of the sintering treatment is 60 to 300 minutes. The method for preparing lightweight aggregate with organic sludge according to claim 1, wherein in the step (a), the temperature range of the hydrothermal liquefaction treatment is 320 to 400°C and the pressure range is 10 to 22 MPa. The method for preparing lightweight aggregate with organic sludge according to claim 3, wherein, in the step (a), the time range of the hydrothermal liquefaction treatment is 5 to 60 minutes. The method for preparing lightweight aggregate using organic sludge according to claim 1, wherein in step (a), the organic sludge is subjected to the hydrothermal liquefaction treatment in the presence of a catalyst. The method for preparing lightweight aggregate using organic sludge according to claim 1, wherein in the step (b), the temperature range of the separation treatment is 100 to 200°C.

Images