A kind of composite curing agent based on biomass and sludge co-firing ash and its application

A composite curing agent, biomass ash technology, applied in solid waste management, sustainable waste treatment, climate sustainability, etc., can solve the problems of fly ash human health hazards, occupation of land space, etc., and achieve high social and economic benefits. Benefit, prevent secondary pollution, reduce cost

Active Publication Date: 2022-04-01
肇庆市珈旺环境技术研究院
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] Sludge can be converted into stable sludge ash after incineration, accounting for more than 50% of the dry weight of sludge. Such a large amount of sludge incineration ash not only occupies land space, but also produces fly ash that is harmful to human health. cause harm

Method used

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  • A kind of composite curing agent based on biomass and sludge co-firing ash and its application
  • A kind of composite curing agent based on biomass and sludge co-firing ash and its application
  • A kind of composite curing agent based on biomass and sludge co-firing ash and its application

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] A heavy metal solidified body prepared from raw materials with the following weight (kg):

[0033] Biomass / sludge co-burning ash 10, P O 42.5 grade ordinary Portland cement 7.2, desulfurized gypsum 0.6, domestic sludge ash / printing and dyeing sludge ash 4.5, under normal temperature conditions 300r / min ball milling and mixing for 40min to collect mixed dry powder Waiting for molding.

[0034] Stir and mix polycarboxylate superplasticizer 0.25 and deionized water 4.8 evenly into the above mixture. Add cationic emulsified pitch PC-2 27.1 into the planetary stirring for 10 minutes, and continue stirring for 10 minutes to obtain a solidified body. The cured body is cured for 7 days at a temperature of 20°C to 30°C and a relative humidity of 80% to complete the heavy metal solidification process of the sludge ash.

[0035] Evaluate the leaching characteristics of the target heavy metals (Ba, Cr, Cu, Mn, Ni, Zn) in the composite solidified body. The leaching results of the ...

Embodiment 2

[0042] Under the same mixed raw material and method in Example 1, add 21.7 weight (kg) of sand before forming and stirring, and a kind of heavy metal solidified body based on biomass ash with sludge ash as the solidification and stabilization object can be obtained , according to the mechanical properties of the cured body: fluidity (Table 2-1), compressive and flexural strength (Table 2-2), freeze-thaw resistance (Table 2-3).

[0043] Table 2-1 Fluidity of cured body

[0044]

[0045] Table 2-2 Compressive and flexural strength of cured body

[0046]

[0047] Table 2-3 Freeze-thaw strength loss of solidified body

[0048]

[0049] It shows that this cured body has good mechanical properties, can be used in construction, garden roadbed and backfill materials, etc., and has a wide application prospect.

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Abstract

The invention discloses a composite curing agent based on biomass / sludge co-burning ash and its application. The composite curing agent includes components such as biomass / sludge co-burning ash, cement, emulsified asphalt, gypsum, and water reducing agent. . The curing agent has a good curing and stabilizing effect on solid wastes such as sludge, bottom sludge and fly ash rich in heavy metals, and can effectively prevent secondary pollution of the environment by heavy metals, and the curing agent uses biomass ash and sludge As the main raw materials, incineration ash has a wide range of sources and low cost, and achieves the purpose of treating waste with waste.

Description

technical field [0001] The present invention relates to a solidification agent for heavy metal sludge, in particular to a solidification agent using biomass raw material and sludge raw material co-fired ash as the main raw material, and the application of the solidification agent in the solidification and stabilization treatment of heavy metal solid waste , belongs to the technical field of heavy metal treatment. Background technique [0002] Sludge is a by-product of municipal wastewater treatment and sewage treatment processes. With the increase in the amount of urban sewage treatment, the amount of sludge produced is also gradually increasing. These sludges contain a large number of harmful substances, such as parasite eggs, pathogenic microorganisms, bacteria, viruses, synthetic organic matter and heavy metal ions. Sludge is perishable, pollutes soil and groundwater, and may also pollute surface water bodies such as rivers, lakes and oceans. [0003] Toxic organics an...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B28/04C04B111/20C04B18/10
CPCC04B28/04C04B2111/00784C04B2111/29C04B22/145C04B18/103C04B18/101C04B2103/302C04B24/36C04B14/06Y02W30/91
Inventor 侯浩波陈宇驰王腾石靖雯曾越李嘉豪
Owner 肇庆市珈旺环境技术研究院
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