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Aluminium-based gelling curing agent for curing dehydrated sludge and application thereof

A technology of dewatered sludge and aluminum-based glue, which is applied in the field of environmental engineering, can solve the problems of serious odor release, solidified sludge with alkalinity, and long coagulation time, and achieve reduction of odor gas release, high environmental and economic benefits, and maintenance The effect of time reduction

Inactive Publication Date: 2012-11-07
TONGJI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The Chinese patent document "Sludge, Sludge Solidifying Agent" (publication number CN 101638311A, published on July 10, 2009) develops polyacrylamide with coal gangue, bentonite, wollastonite, volcanic ash, fly ash, etc. as the main materials. , triethanolamine, quartz powder, fumed silica, iron oxide, water glass and other auxiliary materials for sludge / sludge curing agent. The curing agent is composed of 95% of the main material and 5% of the auxiliary material. The dosage of the curing agent is mud 5% to 10% of the weight, but it takes about a month for the curing block to completely solidify, and the curing agent components are too complicated, making engineering application difficult
[0007] The Chinese patent document "A Method for Sludge Solidification Landfill" (publication number CN 101007696A, published on January 22, 2007) discloses a sludge solidification landfill disposal method using cement, clay or loam as solidification material. method, the mass ratio of sludge, cement and clay or loam is 100:15-80:20-160, and the solidified sludge is mainly used for sanitary landfill, and the treatment cost is high, and the capacity expansion ratio is large, which does not meet the requirements. Sustainable Development Requirements
But its disadvantage is that the amount of stabilizer added is relatively large, and the processing cost is relatively high
[0009] Although the above inventions have their own characteristics, there are still three major deficiencies and shortcomings below when being applied to sludge solidification / stabilization treatment: one. Sanitary landfill and subsequent resource utilization; 2. The hydration rate of the curing agent is slow and the coagulation time is too long, which is not conducive to the large-scale treatment of sludge
3. The solidified sludge is severely alkaline, and the odor is released seriously, which is prone to secondary pollution

Method used

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  • Aluminium-based gelling curing agent for curing dehydrated sludge and application thereof
  • Aluminium-based gelling curing agent for curing dehydrated sludge and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] First, the synthetic calcium aluminate 12CaO·7Al was prepared by hydrothermal synthesis 2 o 3 , the specific synthesis process is as follows: First, the industrial grade raw material Al(OH) 3 and CaCO 3 Calcined in SX2-10-12 muffle furnace at 900-1000°C for 2-3 hours, cooled to room temperature after calcination, ground, passed through 0.08mm sieve, and the under-sieve was highly active Al 2 o 3 and CaO; then Al 2 o 3 : The molar ratio of CaO=7:12 mix the two evenly, and mix uniformly with tap water at the mass ratio of water-solid ratio=1~3:1, and the liquid-solid mixture is kept in a hydrothermal reaction kettle at 100±5°C under normal conditions. Hydrothermal synthesis under high pressure conditions for 1-2 hours; finally, after drying the hydrothermal synthesis product, continue calcining in SX2-10-12 muffle furnace at 1000-1200°C for 2-4 hours, and after the heating is completed, it will naturally drop to At room temperature, the clinker formed is synthetic c...

Embodiment 2

[0028] Synthesis of calcium aluminate 12CaO·7Al by aluminum-based gelling and curing agent of the present invention 2 o 3 The preparation is identical with example 1.

[0029] The components of the aluminum-based gelling curing agent of the present invention are 65% of ordinary Portland cement, calcium aluminate 12CaO·7Al 2 o 3 30%, anhydrous CaSO 4 3%, NaAlO 2 1.5%, triethanolamine is except that the mass ratio of 0.5% is taken, and all the other are identical with example 1. After curing the obtained solidified sludge statically at room temperature for 4 days, the compressive strength of the solidified sludge can reach 60kPa, which meets the requirements for entering the sludge sanitary landfill. After curing for 8-10 days, its compressive strength can reach as high as 0.10MPa.

Embodiment 3

[0031] Synthesis of calcium aluminate 12CaO·7Al as the main component of the aluminum-based gelling and curing agent of the present invention 2 o 3 The preparation is identical with example 1.

[0032] Each component of the aluminum-based gelling curing agent of the present invention is 60% of ordinary Portland cement, calcium aluminate 12CaO·7Al 2 o 3 33%, anhydrous CaSO 4 3.5%, NaAlO 2 2.5%, triethanolamine is except that the mass ratio of 1% is taken, and all the other are identical with example 1. After curing the obtained solidified sludge statically at room temperature for 4-5 days, the compressive strength of the solidified sludge exceeds 50kPa, which meets the requirements for entering the sludge sanitary landfill. After 7-10 days of curing, its compressive strength can reach 0.13MPa. When the time is 28 days, its compressive strength can reach 0.18MPa.

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Abstract

The invention relates to an aluminium-based gelling curing agent for curing dehydrated sludge and an application thereof. The invention is characterized in that the aluminium-based gelling curing agent comprises the following components: 50%-85% of ordinary portland cement, 10%-40% of synthetic calcium aluminate, 2.5%-5% of curing promoting-early strength agent anhydrous CaSO4, 0.5%-1% of triethanolamine, and 2%-4% of NaAlO2. The aluminium-based gelling curing agent is mixed with dehydrated sludge with a mass ratio of 5-30:100; the mixture is stirred uniformly in a stirrer, and is allowed to stand for curing at room temperature; the obtained curing product can be landfilled directly, or be used as cover soil in a landfill, or be produced into building materials with low strength by compacting molding. The material for preparing the aluminium-based gelling curing agent in the invention has extensive sources and low price; the curing treatment of dehydrated sludge by the aluminium-basedgelling curing agent does not cause secondary pollution, can inhibit the generation of malodorous gas with high efficiency, and has higher environmental and economic benefit.

Description

technical field [0001] The invention relates to an aluminum-based gelling and curing agent for solidifying dewatered sludge, and further relates to a method for solidifying and stabilizing the dewatered sludge of urban sewage plants by using the aluminum-based gelling and curing agent, and the obtained solidified sludge can be processed Sanitary landfill or as landfill cover soil, etc., is convenient for the efficient treatment and resource utilization of sludge, and belongs to the field of environmental engineering technology. Background technique [0002] At present, the vast majority of urban sewage treatment plants use biochemical processes to treat sewage. During this process, a large amount of biochemical sludge is often produced. The sludge is usually bulky, with complex organic components, large variability, and high moisture content. Various conventional methods such as landfill, composting, incineration and land utilization cannot achieve efficient and safe disposa...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C02F11/14C04B28/04C04B22/08
CPCC04B7/32C04B28/06
Inventor 赵由才甄广印程晓波陈华周海燕黄仁华
Owner TONGJI UNIV
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