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Harmless and resource utilization treatment method for bottom sludge of polluted water body

A treatment method and resource-based technology, applied in the field of river sediment treatment, can solve problems such as high cost, affecting product performance, and secondary pollution

Inactive Publication Date: 2006-07-26
HARBIN INST OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] In view of the disadvantages that the existing polluted river sediment has not been effectively used, its disposal requires waste of energy and may cause secondary pollution, and the existing use of binders in the process of making river sediment into ceramsite has an impact Due to the disadvantages of high product performance and cost, the present invention provides a kind of ceramsite made of polluted river sediment as raw material, which can improve product performance while reducing the cost of ceramsite. This treatment method is the process of making the polluted water body sediment into ceramsite by controlling specific conditions, and the obtained ceramsite can be used in construction, petroleum, transportation, agriculture, or environmental protection industries can achieve good application value
The invention uses domestic sludge as one of the raw materials, and at the same time solves the problem of sludge treatment in urban sewage treatment plants to a certain extent

Method used

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Effect test

specific Embodiment approach 1

[0009] Specific Embodiment 1: This embodiment is a method for harmless and resourceful treatment of the bottom mud of the polluted water body. First, the river bottom mud and domestic sludge are dehydrated and dried respectively, so that the water content is between 30% or less, then fully mix the raw materials according to the weight percentage of 60-90% of river bottom mud and 10-40% of domestic sludge, keep the moisture content of the mixed raw materials between 20%-30%, and extrude them with a molding machine into the shape of ceramsite; dry and preheat the obtained molded ceramsite so that the moisture content is 8-12%, then fire at 1100-1300°C for 20-40min, and then cool naturally to room temperature.

[0010] Through actual tests, the ceramsite prepared by the method can achieve the following properties: loose bulk density / (kg m -3 )610-970, particle density / (kg m -3 )) 1932-2308, water absorption (%) 3-12, porosity (%) 46-65%, specific surface area / (m 2 g -1 )1.82-3...

specific Embodiment approach 2

[0011] Embodiment 2: The ceramsite made of the ratio of raw materials mentioned in this embodiment is used as a building material. Firstly, dehydrate and dry the Songhua River bottom mud and domestic sludge collected during the pollution period, so that the water content is 20%. Then, the raw materials are calculated by weight percentage. Mud accounts for 25% of the total weight. After mixing fully, keep the moisture content of the mixed raw materials between 25% and 30%, and extrude them into the shape of ceramsite with a molding machine; dry and preheat the obtained shaped ceramsite. Keep the water content at 6-8%, then fire at 1120°C for 32 minutes, and then cool to room temperature naturally; the ceramsite obtained in this embodiment has a dense structure, high hardness, corrosion resistance, not easy to weathering, and long service life. The actual test shows that the obtained ceramsite has a high surface finish, good air permeability, and is not easy to pulverize. The m...

specific Embodiment approach 3

[0012] Specific implementation mode three: the difference between this implementation mode and specific implementation mode two is that the obtained ceramsite is used in agriculture or petroleum industry, and each component is calculated by weight percentage, river channel bottom mud accounts for 80% of the total weight, domestic sludge accounts for 80% of the total weight 20% of the total weight; after being dehydrated and dried, it was fired at 1200°C for 30 minutes.

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PUM

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Abstract

The treatment method with high performance and low cost for sediment in polluted water comprises: mixing the sediment with household sludge to extrusion form, then calcining for 20~40min at 1100~1300Deg. Wherein, the ceramsite in this invention has bulk specific gravity as 610-970kgíñm-3, particle bulk weight as 1932-2308 (kgíñm-3), water absorption ratio as 3-12%, void ratio as 46-65%, and specific surface area as 1. 82-3. 98(m2íñg-1), and fit to spread for application.

Description

technical field [0001] The invention relates to a treatment method for river bottom mud. Background technique [0002] Sediment is mainly composed of clay minerals, organic matter, and active metal oxides. This natural particle has a huge specific surface area and plays an important role in the water environment. It is the source and sink of various pollutants in the water, and records rich information on changes in the river environment. [0003] The main pollutants in the river sediment can be divided into the following categories: (1) Nutrients, including nitrogen and phosphorus compounds. Excessive phosphorus content in the water body will cause a large number of algae to multiply, and a large amount of dissolved oxygen will be consumed during the growth and decay of the algae. The excessive concentration of ammonia will cause toxic and side effects to the organisms in the water body; (2) a large amount of organic matter, Carbohydrates include oil and grease; (3) heavy...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B33/132C04B33/04C04B33/32C02F11/00
CPCY02P40/60
Inventor 许国仁李圭白邹金龙
Owner HARBIN INST OF TECH
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