Method for preparing foamed wall material from municipal sludge

A technology of wall materials and municipal sludge, applied in the direction of biological sludge treatment, application, household appliances, etc., can solve the problems that affect the mechanical strength and service life of building materials, foul smell, and reduce user experience

Inactive Publication Date: 2020-10-30
蚌埠龙淮建筑科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] However, when using municipal sludge to make building materials in the prior art, in addition to dehydrating and drying it, the excess organic matter in the municipal sludge is not treated. As we all know, organic matter can provide nutrients for the growth and reproduction of microorganisms, and is easily destroyed by others. Degradation not only affects the mechanical strength and service life of building materials, but also often produces foul odors during microbial metabolism, which reduces the user experience; in addition, the existing technology uses municipal sludge as the main raw material to prepare sound insulation, heat preservation, and light weight. The foam wall material with qualitative characteristics is relatively rare.

Method used

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  • Method for preparing foamed wall material from municipal sludge

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Effect test

Embodiment 1

[0030] A kind of method utilizing municipal sludge to prepare foam wall material, comprises the following steps:

[0031] S1: Anaerobic fermentation of sludge: the municipal sludge is dried to a water content of 40%, and then inoculated with 0.1wt% Methanobacterium formici (preservation number is DSM-No.1535) and 0.05wt% Saccharomyces cerevisiae (preservation number is CCTCC No: M2011290), anaerobic fermentation at 30°C for 25 days, after collecting the generated biogas and distilling off the alcohol, inject ozone into the obtained expanded sludge at a flow rate of 2L / min for 1 hour to sterilize and deodorize;

[0032] S2: Puffing treatment of straw fiber: crush the rape straw to 8mm in length, soak it in 15% ammonia solution, control the solid-liquid ratio to 1g:1mL, stir for 1h, then put it into a steam explosion tank, at 160°C, 0.5MPa After holding the pressure for 10 minutes under the same conditions, steam explosion treatment is carried out to obtain puffed straw fibers; ...

Embodiment 2

[0040] A kind of method utilizing municipal sludge to prepare foam wall material, comprises the following steps:

[0041] S1: Anaerobic fermentation of sludge: the municipal sludge is dried to a water content of 45%, and then inoculated with 0.15wt% Methanobacterium formici (preservation number is DSM-No.1535) and 0.075wt% Saccharomyces cerevisiae (preservation number is CCTCC No: M2011290), anaerobic fermentation at 30°C for 25 days, after collecting the generated biogas and distilling off the alcohol, inject ozone into the obtained expanded sludge at a flow rate of 4L / min for 1 hour to sterilize and deodorize;

[0042] S2: Puffing treatment of straw fiber: crush wheat straw to a length of 10mm, soak in 15% ammonia solution, control the solid-liquid ratio to 1g:1.25mL, stir for 2h, then add it to a steam explosion tank, and heat it at 170°C and 1MPa After keeping the pressure for 20 minutes under the same conditions, steam explosion treatment is carried out to obtain puffed s...

Embodiment 3

[0050] A kind of method utilizing municipal sludge to prepare foam wall material, comprises the following steps:

[0051] S1: Anaerobic fermentation of sludge: the municipal sludge is dried to a water content of 45%, and then inoculated with 0.2wt% Methanobacterium formici (preservation number is DSM-No.1535) and 0.1wt% Saccharomyces cerevisiae (preservation number is CCTCC No: M2011290), anaerobic fermentation at 30°C for 25 days, after collecting the generated biogas and distilling the alcohol, and passing ozone into the obtained expanded sludge at a flow rate of 6L / min for 2 hours to sterilize and deodorize;

[0052] S2: Puffing treatment of straw fiber: crush wheat straw to a length of 10mm, soak it in 15% ammonia solution, control the solid-liquid ratio to 1g:1.25mL, stir for 2h, then put it into a steam explosion tank, and heat it at 180°C, 1.5 Under the condition of MPa, pressurize for 30 minutes and then carry out steam explosion treatment to obtain puffed straw fibers...

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Abstract

The invention discloses a method for preparing a foamed wall material from municipal sludge. The method comprises the following steps: S1, performing anaerobic fermentation of the sludge: drying the municipal sludge until the water content is 40-45%, inoculating 0.05-0.2 wt% of methanogens and 0.05-0.1 wt% of saccharomycetes, carrying out anaerobic fermentation at 30 DEG C for 25 days, collectingthe generated biogas, steaming out alcohol, and introducing ozone into the obtained expanded sludge for sterilization and deodorization; S2, performing puffing treatment on straw fibers; S3, carryingout puffing treatment on fly ash; and S4, preparing the foaming wall material: a, preparing materials; b, foaming; and c, uniformly mixing the expanded fly ash, cement and water, adding the expanded sludge and the expanded straw fibers, uniformly stirring, adding the prepared foam, uniformly mixing, pouring into a wall mold, naturally curing for 10-14 days, demolding, and drying to obtain the product. The prepared foaming wall material is light in weight, high in strength, resistant to fire and flame, excellent in heat insulation and sound insulation performance, high in corrosion resistance and mildew resistance, small in shrinkage rate, wide in raw material source and low in cost, and waste is turned into wealth.

Description

technical field [0001] The invention belongs to the technical field of sludge recycling and regeneration of building materials, and in particular relates to a method for preparing foamed wall materials from municipal sludge. Background technique [0002] Municipal sludge refers to the sludge generated during the operation and maintenance of urban municipal facilities related to urban life and urban life activities. With the rapid advancement of urbanization, the discharge of municipal sludge continues to increase. According to the source, it can be divided into sewage plant sludge, water supply plant sludge, drainage pipeline sludge, dredging sludge and construction mud. At present, the main treatment methods of municipal sludge are direct incineration, landfill or resource recycling, etc. Among them, the direction of resource recycling is mainly: fertilizer, animal feed, adsorbent, building materials, etc. For example, the patent with application number CN201910712960.3 di...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B28/02C02F11/02C04B111/20C04B111/40C04B111/52
CPCC02F11/02C04B28/02C04B2111/00017C04B2111/2092C04B2111/40C04B2111/52C04B2201/20C04B2201/32C04B18/0418C04B18/24C04B22/06C04B18/08C04B22/122C04B22/10C04B24/166C04B24/122C04B24/14C04B24/00C04B38/106
Inventor 沈贵宁沈恒宇
Owner 蚌埠龙淮建筑科技有限公司
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