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A kind of sludge dehydration composite conditioner adapting to the process of producing building materials from excess sludge, its preparation method and application

A technology for sludge dehydration and excess sludge, which is applied in the direction of dehydration/drying/concentrated sludge treatment, etc. It can solve the problems of large amount of chemical addition, insignificant conditioning effect, and influence on comprehensive utilization of sludge, and achieves simple and efficient dehydration. Low cost and the effect of reducing the cost of sludge dewatering

Inactive Publication Date: 2017-03-01
DONGHUA UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In the prior art, the amount of medicament added is large, it cannot act on the water inside the cells, the conditioning effect is not significant, and the addition of conditioners affects the comprehensive utilization of subsequent sludge and other problems that need to be solved urgently.

Method used

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  • A kind of sludge dehydration composite conditioner adapting to the process of producing building materials from excess sludge, its preparation method and application

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] First of all, according to the national standard, the composition of residual sludge, waste concrete, fly ash, municipal waste, smelting tailings, carbide slag, and biomass was tested, and according to the composition according to the mass ratio of SiO 2 20%: Al 2 o 3 15%: Fe 2 o 3 8%: CaO 1.0%: C 30%: N 2%, the rest are elements such as hydrogen and oxygen, mix evenly, spray microbial deodorizer evenly after mixing, ventilate the mixture for 7 days, and get dry sludge dehydration conditioner . The sludge conditioner is added to the sludge, and the amount of the sludge conditioner added is 10% of the mass percentage of the dry weight of the sludge. The building material block is prepared by using the building material molding equipment, and the block is given at 30L / min / kg After ventilating for 6 days, the sludge can be dried and the required raw materials for sludge building materials can be obtained.

Embodiment 2

[0027] First of all, according to the national standard, the composition of residual sludge, waste concrete, fly ash, municipal waste, smelting tailings, carbide slag, and biomass was tested, and according to the composition according to SiO 2 40%: Al 2 o 3 5%: Fe 2 o 3 1%: CaO 3%: C30%: N 0.25%, the rest are elements such as hydrogen and oxygen, mixed evenly, after mixing, spray microbial deodorant evenly, and ventilate the mixture for 3 days to obtain a dry sludge dehydration conditioner. The sludge conditioner is added to the sludge, and the amount of the sludge conditioner added is 20% of the mass percentage of the dry weight of the sludge. The building material block is prepared by using the building material molding equipment, and the block is given at 5L / min / kg After ventilating for 7 days, the sludge can be dried and the required raw materials for sludge building materials can be obtained.

Embodiment 3

[0029] First of all, according to the national standard, the composition of residual sludge, waste concrete, fly ash, municipal waste, smelting tailings, carbide slag, and biomass was tested, and according to the composition according to the mass ratio of SiO 2 60%: Al 2 o 3 7%: Fe 2 o 3 6%: CaO 5%: C 15%: N 1%, and the rest are elements such as hydrogen and oxygen, mixed evenly, after mixing, spray microbial deodorant evenly, ventilate the mixture for 5 days, and obtain a dry sludge dehydration conditioner. The sludge conditioner is added to the sludge, and the amount of the sludge conditioner added is 40% of the mass percentage of the dry weight of the sludge. The building material block is prepared by using the building material molding equipment, and the block is given at 20L / min / kg After 10 days of ventilation, the sludge can be dried and the required raw materials for sludge building materials can be obtained.

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Abstract

The invention relates to a compound sludge dewatering conditioner adaptable to a technology for production of building materials from excess sludge as well as a preparation method and an application of the conditioner. The conditioner comprises components in percentage by mass as follows: 20%-60% of SiO2, 5%-20% of Al2O3, 1%-15% of Fe2O3, 5%-15% of CaO, 5%-30% of C and 0.25-2% of N. The preparation method comprises steps as follows: mixing waste concrete, carbide slag, waste fly ash and smelting tailings in proportion to obtain a mixture, mixing the mixture with sludge, spraying a microorganism odor absorber, and performing ventilation and heat preservation for 3-7 days to obtain the conditioner. The conditioner has the dewatering effect and can be used as an important component of raw building materials. When the conditioner is applied to deep sludge dewatering, the method is simple, the dewatering rate can be adjusted according to the comprehensive utilization application of the sludge, the moisture content can be decreased to be lower than 5%, preparation of the building materials such as ceramsite, bricks and the like is facilitated, and the cost for preparation of the building material from the sludge is reduced.

Description

technical field [0001] The invention belongs to the field of sludge dehydration composite conditioner and its preparation and application, and in particular relates to a sludge dehydration composite conditioner suitable for the process of producing building materials from surplus sludge, its preparation method and application. Background technique [0002] Sludge is a viscous substance produced in the process of sewage treatment. It is mainly composed of aerobic and anaerobic microorganisms. It has a high content of organic matter and is closely combined with water. Generally, the water content of the sludge in the secondary sedimentation tank of the sewage plant is 97% to 99%, of which the interstitial water accounts for about 70%, the capillary water accounts for about 20%, the adsorbed water is about 7%, and the intracellular water is about 3%. At present, the water content of sewage sludge is 75% to 85% after sedimentation and pressure filtration dehydration. [0003] O...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C02F11/14
Inventor 李登新蔡文倍
Owner DONGHUA UNIV
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