Unlock instant, AI-driven research and patent intelligence for your innovation.

A method for recycling tunnel sludge

A technology of recycling and tunneling, applied in the field of environmental protection and recycling, can solve the problems of occupying permanent land, lack of comprehensive planning for the utilization of tunnel waste residue, and occupying drainage channels, so as to reduce the difficulty of sludge management and achieve sustainable development. , to achieve the effect of collaborative resources

Active Publication Date: 2022-01-14
中铁环境科技工程有限公司 +1
View PDF8 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] At the same time, in the current stage of tunnel construction, the utilization of tunnel slag has not received enough attention, and there is a lack of comprehensive planning for the utilization of tunnel slag. Transported as spoil to the spoil yard for disposal, the utilization is relatively simple, and the tunnel spoil cannot be fully and comprehensively utilized as a high-quality road construction material, and the utilization rate is low
In addition, it is necessary to build special access roads and waste dumps, occupying a large amount of permanent land acquisition
During the actual construction process of the project, some construction teams, for the convenience of construction and saving construction costs, should have transported the slag that should have been transported to the waste slag yard to be flattened and rolled, but they were not piled up according to the design requirements, and were randomly discarded near the tunnel entrance. , pollute the construction environment, occupy the drainage channels, and lead to secondary disasters

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • A method for recycling tunnel sludge

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] Tunnel construction sewage enters the high-density sedimentation tank, and 50mg / L polyaluminium chloride and 2mg / L anionic polyacrylamide are added to carry out flocculation and precipitation reaction, and the flocs generated are concentrated on-line in the high-density sedimentation tank and discharged as residual sludge . The water content of the discharged sludge is 91.2%. Compared with the sludge with a water content of 99% discharged from the secondary sedimentation tank of a general urban sludge treatment plant, the volume of the sludge is reduced by about 88%, which reduces the occupied area and can be directly processed Dehydration treatment. . The remaining sludge discharged is conditioned by cationic polyacrylamide and then enters the elliptical sludge dewatering machine for dehydration treatment. The amount of cationic polyacrylamide added is 6g / kg dry sludge, and the moisture content of the sludge after dehydration treatment is 79.2%.

Embodiment 2

[0033] This example is an application example of using dewatered sludge with a water content of 79.2% in Example 1 as a thickener, and machine-made sand obtained by crushing tunnel slag as fine aggregate to prepare self-compacting concrete. The distribution of each group is shown in Table 1.

[0034] Table 1 Component distribution ratio table under different dewatered sludge content (kg / m 3 )

[0035]

[0036] The flow performance of fresh self-compacting concrete with different dewatered sludge content was compared. Slump expansion is an important indicator of flow performance. A larger expansion means better fluidity. At the same time, the cohesion and water retention of self-compacting concrete can be observed with the naked eye.

[0037] Table 2 Slump expansion of fresh self-compacting concrete with different dewatered sludge content

[0038] Numbering Slump spread (mm) Cohesion water retention 1 675 A small amount of stone segregation A small...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

PropertyMeasurementUnit
strengthaaaaaaaaaa
Login to View More

Abstract

The invention relates to a method for resource utilization of tunnel sludge, which belongs to the field of environmental protection resource utilization, and in particular to a method for resource utilization of sludge generated in tunnel sewage treatment. The technical scheme of the present invention is as follows: a method for recycling tunnel sludge, the specific steps are as follows: use tunnel slag machine-made sand as fine aggregate, dry and sieve the tunnel slag machine-made sand, and mix it with cement and coarse bone Water reducer, retarder, fly ash, and water are used as base material together, and dewatered sludge is added as thickener, mixed and stirred to prepare self-compacting concrete. The present invention uses high-density sedimentation for tunnel construction sewage treatment to realize online concentration of sludge, and the discharged sludge is directly dehydrated through a sludge dewatering machine, thereby realizing sludge reduction and reducing the amount of sewage generated during tunnel construction sewage treatment. The difficulty of sludge management avoids secondary pollution caused by sludge accumulation, realizes collaborative resource utilization, meets the needs of environmental protection and engineering raw materials, and achieves sustainable development.

Description

technical field [0001] The invention relates to a method for resource utilization of tunnel sludge, which belongs to the field of environmental protection resource utilization, and in particular to a method for resource utilization of sludge generated in tunnel sewage treatment. Background technique [0002] The sludge produced by the conventional process used in the sewage treatment of tunnel construction has a large output and high water content, and the sludge drying process is often used. At the same time, the process units such as the adjustment tank and the coagulation reaction tank are prone to sludge sedimentation, and excavation machinery is required. Regular mechanical cleaning or manual cleaning and external transportation often result in a large amount of sludge accumulation due to untimely cleaning, which not only poses the risk of secondary pollution, but also occupies a large amount of land area. Harmless treatment, resource utilization, and industrial develop...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
Patent Type & Authority Patents(China)
IPC IPC(8): C04B28/04
CPCC04B28/04C04B2201/50C04B2111/00017C04B2111/00724C04B18/08C04B14/02C04B18/16C04B24/10C04B2103/302C04B18/0418C04B22/12C04B24/2652
Inventor 刘东斌言海燕陈亚利徐德良曹文娟王喜
Owner 中铁环境科技工程有限公司