Method for manufacturing ecological building blocks of riverway protection slope from sewage plant sludge

A sewage treatment plant and sludge technology is applied in the field of making river slope protection ecological blocks from sewage treatment plant sludge, which can solve the problems of occupying landfill storage capacity, high sludge moisture content, poor mechanical properties, etc. System, low cost effect

Active Publication Date: 2012-07-04
JIANGSU MINGXUAN ENVIRONMENT TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Sludge is sent to sanitary landfill for landfill disposal. Due to the high moisture content and poor mechanical properties of sludge, it not only takes up valuable landfill storage capacity, but also often causes engineering disasters such as landslides.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0017] (1) According to the following percentage distribution by weight: sewage plant sludge (moisture content 80%) 10%, cement (425#) 13%, gravel (particle size 25mm) 44%, sand 27%, water 6%.

[0018] (2) Mix and stir the above materials evenly, put them into the mold, and use a press to preform them under the condition of 32MPa, and the molding time is 10 seconds.

[0019] (3) The prefabricated blocks are sent to the autoclave curing workshop, where they are cured for 10 hours at a steam temperature of 200°C and a pressure of 1MPa.

[0020] (4) The cured blocks are placed under natural conditions for 28 days, and the compressive strength of the blocks is 30MPa.

Embodiment 2

[0022] (1) According to the following percentage distribution by weight: sewage plant sludge (moisture content 82%) 8%, cement (325#) 14%, crushed stone (particle size 22mm) 44%, sand 29%, water 5%.

[0023] (2) Mix and stir the above materials evenly, put them into the mold, and use a press to preform them under the condition of 28MPa, and the molding time is 10 seconds.

[0024] (3) The prefabricated blocks are sent to the autoclave curing workshop, where they are cured for 10 hours at a steam temperature of 200°C and a pressure of 0.85MPa.

[0025] (4) The cured blocks are placed under natural conditions for 28 days, and the compressive strength of the blocks is 21.5MPa.

Embodiment 3

[0027] (1) According to the following percentage distribution by weight: sewage plant sludge (moisture content 60%) 5%, cement (425#) 15%, gravel (particle size 10mm) 43%, sand 30%, water 7%.

[0028] (2) Mix and stir the above materials evenly, put them into the mold, and use a press to preform them under the condition of 32MPa, and the molding time is 7 seconds.

[0029] (3) The prefabricated blocks are sent to the autoclave curing workshop, where they are cured for 8 hours at a steam temperature of 220°C and a pressure of 0.9MPa.

[0030] (4) The cured blocks are placed under natural conditions for 29 days, and the compressive strength of the blocks is 30MPa.

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Abstract

The invention discloses a method for manufacturing ecological building blocks of a riverway protection slope from sewage plant sludge, belonging to the technical fields of resource utilization and environmental protection. The method comprises the following steps of: uniformly mixing and stirring sludge, cement, gravels, sand and water of a sewage plant; and prepressing and forming under a certain pressure and culturing under the steaming and curing condition to manufacture ecological protection slope building blocks for riverway renovation. The invention can solve the problems of sludge disposal and treatment, solves the problem of secondary pollution of heavy metals and pathogens in sludge and realizes the renewable resource recycling of the sludge. The produced ecological building blocks have the advantages of high strength and blush resistance, and N, P and K in the sludge can be used as nutrition matrixes for ecological growth, thus the ecological system of the riverway protection slope can be improved and a favorable riverway landscape is built.

Description

technical field [0001] The invention relates to a method for producing river, river and lake slope protection ecological blocks by utilizing the sludge produced in a sewage plant, which can realize the harmless and resource utilization of the sludge. The produced ecological blocks can not only meet the requirements of water conservancy projects for slope protection materials, but also can be used as a carrier for biological growth. Background technique [0002] Sewage plant sludge contains a large number of microorganisms, pathogens, heavy metals, and organic pollutants. If it is not properly treated, it will cause serious secondary pollution. How to treat and dispose of sludge has become a hot and difficult issue of concern all over the world. [0003] At present, the disposal of sludge is mainly converted to agricultural use, incineration and landfill. When composting is converted to agricultural use, the hygienic indicators and heavy metal indicators of untreated sludge...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B28B3/00B28B11/24C04B28/00
Inventor 沈琴黄海李磊
Owner JIANGSU MINGXUAN ENVIRONMENT TECH
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