Modified sludge-based hydrothermal carbon and application of modified sludge-based hydrothermal carbon in incineration of dewatered sludge

A hydrothermal carbon and sludge technology, applied in the fields of resources, environment and energy utilization, can solve the problems of increasing the wear and tear of the flue gas treatment system, restricting the development of sludge incineration technology, reducing the thermal efficiency of the incinerator, etc., and achieving a reduction in the moisture content of the sludge , promote the hydrothermal liquefaction reaction, improve the effect of flocculation efficiency

Active Publication Date: 2021-07-30
ANHUI UNIVERSITY OF TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Excessive moisture content of sludge will lead to an increase in flue gas volume, reduce the thermal efficiency of the incinerator, and increase the wear and tear of the flue gas treatment system
Difficult dehydration, high moisture content, large investment, and low incineration calorific value are the bottlenecks restricting the development of sludge incineration technology.

Method used

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  • Modified sludge-based hydrothermal carbon and application of modified sludge-based hydrothermal carbon in incineration of dewatered sludge
  • Modified sludge-based hydrothermal carbon and application of modified sludge-based hydrothermal carbon in incineration of dewatered sludge
  • Modified sludge-based hydrothermal carbon and application of modified sludge-based hydrothermal carbon in incineration of dewatered sludge

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] Embodiment 1: preparation of chitosan grafted polyacrylamide (Chi-g-PAM)

[0034] Step S1, using an oil bath to maintain a constant temperature of 40°C, stirring and adding 3 g of chitosan into 150 mL of 1w / v% acetic acid aqueous solution in a light-proof Erlenmeyer flask, purging with nitrogen during the process;

[0035] Step S2, the solution was stirred for 30min, and 1mL of 0.058mM cerium ammonium nitrate initiator and 3mL photoinitiator (V50) were added to generate primary free radicals on the chitosan main chain, grafted with acrylamide (AM), and the initiator was pretreated 5min, inhibit the formation of PAM homopolymer;

[0036] Step S3, add 9gAM monomer while stirring so that the mass ratio of chitosan and acrylamide is 1:3, and place it in an ultraviolet-microwave induction device (microwave power: 100-1000W, frequency: 2450MHz, power supply: 1500VA, ultraviolet Wavelength range: 290nm-400nm, lamp power: 100W), the irradiation time is set to 30min, and the po...

Embodiment 2

[0039] Example 2: Preparation of modified sludge-based hydrothermal carbon, Chi-g-PAM is prepared according to the method of Example 1

[0040] Step S1, dehydrating 10.0wt.% of the remaining sludge produced in the sludge thickening tank 3 through the plate and frame filter press 6 to obtain dewatered sludge, and the water content was determined to be 76.34wt.%.

[0041]In step S2, the dewatered sludge is mixed with Chi-g-PAM (5.0wt.%) prepared in Example 1, and then transported to the two-stage continuous hydrothermal reactor 11 through the high-pressure plunger pump 9. In the heat exchanger 10 After heating up to 85°C, enter the hydrothermal reaction zone, raise the temperature to 450°C at a rate of 15°C / min, and conduct a hydrothermal reaction for 30 minutes;

[0042] Step S3, after the hydrothermal liquefaction reaction, the mixed product is gas-collected, heat-exchanged, and cooled, and carbon tetrachloride (or ethyl acetate can also be used) is used to extract and separat...

Embodiment 3

[0043] Example 3: Preparation of hydrothermal charcoal-doped sludge, wherein: Chi-g-PAM is prepared according to the method of Example 1, and modified sludge-based hydrothermal charcoal is prepared according to the method of Example 2

[0044] Step S1, uniformly dispersing the modified sludge-based hydrothermal charcoal and Chi-g-PAM in the remaining sludge produced by the initial press filtration of the plate and frame filter press 6, the moisture content of the sludge was determined to be 76.34wt.%, Chi - The addition ratio of g-PAM in the sludge is 5.0wt.%;

[0045] Step S2, the sludge to be treated is transported to the plate and frame filter press 6 through the high-pressure plunger pump 9, and hydrothermal carbon-doped sludge is obtained after pressure filtration, liquid-solid separation, and slag unloading.

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Abstract

The invention discloses modified sludge-based hydrothermal carbon and application of the modified sludge-based hydrothermal carbon to incineration of dewatered sludge. According to the technical scheme provided by the invention, residual sludge of a sewage plant is taken as a raw material, subcritical water is taken as a medium, and the modified sludge-based hydrothermal carbon with high calorific value and high water permeability is formed under a hydrothermal liquefaction condition and is used for sludge modification incineration power generation for the first time; and the purposes of efficient reduction, harmless treatment and resource utilization of the residual sludge can be synchronously achieved in an economical and effective mode, and the method belongs to innovation in the aspects of waste cooperative treatment and resource utilization.

Description

technical field [0001] The invention relates to the field of resource environment and energy utilization, and specifically relates to a modified sludge-based hydrothermal charcoal and its use for sludge dehydration and incineration. Background technique [0002] Sludge mainly refers to the sludge generated from the sewage treatment process of sewage plants, which is an extremely complex heterogeneous body composed of organic debris, bacterial cells, inorganic particles, colloids, etc. The main characteristics of sludge are high water content, high organic matter content, perishable and smelly, fine particles and small specific gravity, and it is in a colloidal liquid state. It is a thick substance between liquid and solid, which can be transported by pump, but it is difficult to separate solid and liquid by sedimentation. As a by-product of sewage treatment, sludge enriches the pollutants and nutrients of sewage, and has dual attributes of "resource" and "pollution" at the ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F11/122C02F11/10C10L9/08C10B57/10C10B57/04C10B57/06F23G5/04
CPCC02F11/122C02F11/10C10L9/086C10B57/04C10B57/10C10B57/06F23G5/04
Inventor 张会文张润毫李文雅凌张朱正飞马江雅颜庭轩闫玉杰聂勇高原张芙靳奥
Owner ANHUI UNIVERSITY OF TECHNOLOGY
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