An ex-situ active magnesium oxide carbonization and solidification sludge treatment system

Abstract

The invention discloses a treatment system for carbonizing and curing silt soil by heterotopic active magnesium oxide. The system comprises a pretreatment device, a curing agent supply device, a uniform mixing device, a granulation device, a carbonization device and a collection device. Through the sequential working of the devices, the sufficient blending of silt and a curing and the quick carbonization of a magnesium oxide cured silt granule are completed; thus, the problems of the difficult carbonization and curing of high-water-content and low-permeability silt / sludge soil are solved; multiple sensors particularly arranged in the system are cooperatively used; the supply quantity of the curing agent can be regulated through actually measuring a water content; the particle size of the granule and the pressure of carbon dioxide are regulated according to the property of the soil; the work efficiency is greatly improved; all the devices are more systematized and process-oriented; milldust and the carbon dioxide can be absorbed in the use process of the devices; the secondary pollution is avoided; the carbonized granule of the silt, generated after the devices finish working, is high in hardness and high in shear strength, and can be used as a filling material for a roadbed, an airport runway, engineering backfilling and the like, and the treatment system has great engineeringconstruction significance for the reutilization of silt / sludge in engineering.

Description

[0001] Field [0002] The invention relates to an ex-situ activated magnesia carbonization and solidification sludge treatment system, which belongs to the reinforcement field of civil engineering rock soil or municipal engineering special soil. Background technique [0003] my country has a vast territory, numerous rivers and lakes, and the rapid development of civil engineering construction. During the dredging and dredging of rivers and lakes and the construction of civil and water conservancy projects, a large amount of silt will be produced. These silts have high moisture content, high clay content, poor water permeability, physical The mechanical index is poor. Some river and lake silts even contain a large amount of organic matter and harmful heavy metals. It is difficult to directly use them as filling materials in engineering. A series of social problems such as source pollution. For weak silt foundations, methods such as vacuum preloading and dewatering, heat treatmen...

AI Technical Summary

Problems solved by technology

[0007] The present invention is aimed at the problems of poor carbonization uniformity, serious waste of carbon dioxide, and inadaptability to sludge with high water content in the existing carbonization reinforcement technology, and provides an ex-situ active magnesium oxide carbonization solidification sludge treatment system, which includes: pretreatment device, curing agent supply device, homogenizing device, granulation device, carbonization device and collection device, through the sequential operation of the above devices, complete mixing of sludge and curing agent and rapid carbonization of magnesium oxide solidified sludge particles, thus solving high Water content, low permeability silt / sludge soil is difficult to carbonize and strengthen; multiple sensors specially designed for the system can be used together to adjust the supply of curing agent by measuring the water content, and adjust the particle size and carbon dioxide pressure according to the soil properties. The working efficiency is greatly improved, and the whole device is more systematic and streamlined. During the use of the device, it can absorb dust and carbon dioxide, avoiding secondary pollution. The sludge carbonized particles produced after the operation of the device have high hardness and high shear strength, which can be used as Filling materials such as roadbeds, airport runways, and engineering backfills have great engineering construction significance for the reuse of silt / sludge and carbon dioxide in engineering

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