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Method for preparing controllable low-strength material from sludge in waterworks, and material

A waterworks, low-strength technology, applied in the research field of controllable low-strength materials, can solve problems such as aluminum poisoning, achieve the effects of reducing treatment costs, significant economic benefits, and reducing environmental burdens

Inactive Publication Date: 2020-08-07
南京国兴环保产业研究院有限公司 +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to the disadvantages of soil acidification, aluminum poisoning and phosphorus deficiency, there are still some limitations in the application of waterworks sludge in agriculture.

Method used

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  • Method for preparing controllable low-strength material from sludge in waterworks, and material
  • Method for preparing controllable low-strength material from sludge in waterworks, and material
  • Method for preparing controllable low-strength material from sludge in waterworks, and material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] Embodiment 1: see figure 1 (a) and figure 1 (b), the proportion of sludge from the waterworks was 0%, 12.5%, 25%, 50% and 100%, respectively, to test the coagulation time and compressive strength of the controllable low-strength material, of which 12.5% The group is relatively close to the engineering standard (slump to meet 210 mm ± 10m, final setting time < 24 hours, compressive strength controlled at 0.3-2.1MPa).

Embodiment 2

[0034] Example 2: see figure 2 (a) and figure 2 (b), the setting time and compressive strength test results of controllable low-strength materials prepared for adding different coagulation aids (where Control is the blank control group), it can be seen from the analysis of the above results: compared with the blank control group, adding 4% After adding -8% organic coagulant (TEA, triethanolamine), the initial setting time and final setting time were reduced by 70%-80%, respectively. Finally, calcium-based coagulants (CaO, CaCl 2 , Ca(NO) 3 , Ca(OAc) 2 ) and the controllable low-strength materials of organic coagulants are in line with the international engineering standards for controllable low-strength materials.

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Abstract

The invention relates to a method for preparing a controllable low-strength material from sludge in waterworks, and the material. According to the method, the sludge from the waterworks and recycled fine aggregate are used as aggregate, and cement and fly ash are used as binders. The method comprises the following steps: firstly, mixing the aggregate and the binders for 1-2 minutes by using a drymethod, quickly adding water and carrying out stirring for 2-5 minutes after uniform mixing until the water is uniformly mixed with the aggregate and the binders, then adding a coagulant aid, and carrying out quick and uniform stirring; gradually adding water, synchronously conducting stirring in the water adding process, measuring slump at any time, and stopping adding water and stirring until the slump reaches 210 mm + / - 10 mm; and pouring the mixed materials into a mold, and carrying out aging maintenance at room temperature. The invention also provides the controllable low-strength material prepared by using the method. The method of the invention solves problem in recycling the sludge of the waterworks, converts the sludge from the waterworks into a building material, greatly reducesthe sludge treatment cost of the waterworks, and decreases environmental burden.

Description

technical field [0001] The invention relates to a method and material for preparing a controllable low-strength material by using sludge from a waterworks plant, and belongs to the technical field of controllable low-strength material (CLSM) research. Background technique [0002] Clean water is essential to human life, and people's demand for clean drinking water is getting higher and higher. However, a large amount of waterworks sludge is generated during water purification. The management and disposal of waterworks sludge is a global problem. Unlike ordinary sewage sludge, waterworks sludge has a low calorific value, making it difficult to recover energy from incineration. Currently, all waterworks sludge undergoes energy-intensive dewatering processes or is unsustainably disposed of in landfills due to a lack of reliable recycling methods. In the face of scarce land resources and strict environmental requirements, research in recent years has also explored the recycli...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B28/00B28B1/14B28B11/24B28C5/00
CPCB28B1/14B28B11/245B28C5/003C04B28/00C04B2111/00017C04B7/26C04B18/0418C04B18/16C04B2103/12C04B2103/44
Inventor 王磊丁士明
Owner 南京国兴环保产业研究院有限公司