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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: 2011-08-17
JIANGSU MINGXUAN ENVIRONMENT TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

This patented technology allows us to produce eco-friendly blocks on rivers or lakes without causing harmful substances like plankton blooms (PB) during their production processes. These blocks are strong enough to protect against scours caused by rainwater runoff along these slopes while being able to support vegetative growth through its own roots. They may contain various fertilizers such as nitrogen sulfate, calcium phosphorus, magnesium silicate, potassium chloride, pH adjusting agents, carboxylic acids, lignin hydroxypropyl alcohol esters, polysaccharides, polyvinyl pyridine), organisms, mineral deposits, iron oxidized copper flake particles, and others. Overall, this new technique helps prevent damage to both natural resources and human health at large scales.

Problems solved by technology

This patented technical solution described by this patents relates to how wastewater plants handle excessive amounts of residue from their processes that contain harmful substances like bacteria or other chemical agents used during production. These materials can be dangerous if they enter into soil waterways causing environmental concerns due to potential negative effects on aquatic ecosystem healthy flora. Therefore, these solutions aim to provide an effective method for safely handling them without creating new hazards.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

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

[0018] (2) The above materials are mixed and stirred uniformly and then put into a mold, and pre-formed by a press under the condition of 32 MPa, and the molding time is 10 seconds.

[0019] (3) The prefabricated blocks are sent to the autoclave curing workshop and cured for 10 hours under the condition of steam temperature of 200℃ and 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 weight percentages: sewage plant sludge (moisture content 82%) 8%, cement (325#) 14%, crushed stone (particle size 22mm) 44%, sand 29%, water 5%.

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

[0024] (3) The prefabricated blocks are sent to the autoclave curing workshop and cured for 10 hours under the condition of steam temperature of 200℃ and 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 weight percentages: sewage plant sludge (moisture content 60%) 5%, cement (425#) 15%, crushed stone (particle size 10mm) 43%, sand 30%, water 7%.

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

[0029] (3) The prefabricated blocks are sent to the autoclave curing workshop and cured for 8 hours under the condition of steam temperature of 220℃ and 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

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Claims

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Application Information

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Owner JIANGSU MINGXUAN ENVIRONMENT TECH
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