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A method for preparing hydrothermal coke from urban sewage biological sludge

A technology for biological sludge and municipal sewage, which is used in dewatering/drying/concentrating sludge treatment, biofuels, sludge treatment, etc. Groundwater pollution and other problems, achieve significant economic and environmental benefits, simple preparation methods, and reduce treatment costs.

Inactive Publication Date: 2016-06-08
DONGHUA UNIV +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although the composting and incineration of biological sludge can recover the internal energy of the sludge itself, it will produce air pollutants such as odor and dioxin during the treatment process, causing secondary pollution problems; using landfill to treat sludge not only It requires a lot of land, and it will also cause soil and groundwater pollution problems due to leakage and other factors; using high-temperature / medium-temperature anaerobic / aerobic digestion technology to stabilize the sludge and apply it to farmland as an organic fertilizer can improve farmland productivity. However, more and more studies have shown that although sludge can kill most pathogenic microorganisms and bacteria after digestion, it cannot effectively remove heavy metals and some persistent organic pollutants in sludge. When sludge is applied to farmland for fertilization, it may still cause soil and even groundwater pollution

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0016] Air-dry the municipal sewage biological sludge, and grind it into particles of about 2mm after drying. Take 5.0g of sludge particles and place them in a polytetrafluoroethylene-lined hydrothermal reactor, add 40mL distilled water and 4.4mL Ferrous sulfate solution with a concentration of 50mmol / L, sealed, then put the hydrothermal reactor into a stainless steel heating jacket, control the magnetic stirring speed at 150rpm, heat to 200°C for 10h, after the reaction, put the reactor into Quickly cooled to room temperature in ice water, poured out the solid-liquid mixture obtained from the reaction into a beaker, washed repeatedly with distilled water, vacuum filtered, then dried at 105°C for 24 hours, and finally weighed to obtain about 3.1 g of hydrothermal coke.

[0017] It can be known from detection and analysis that the high calorific value of the prepared hydrothermal coke is about 15.75MJ / kg.

Embodiment 2

[0019] Air-dry the municipal sewage biological sludge, grind it into particles of about 1mm after drying, take 5.0g of sludge particles and place them in a polytetrafluoroethylene-lined hydrothermal reactor, add 30mL of distilled water and 15mL of concentration It is a 50mmol / L iron oxide nanoparticle solution, seal it, then put the hydrothermal reaction kettle into the stainless steel heating jacket, control the magnetic stirring speed at 250rpm, heat it to 180°C for 8 hours, after the reaction, put the reaction kettle into Quickly cooled to room temperature in ice water, poured out the solid-liquid mixture obtained from the reaction into a beaker, washed repeatedly with distilled water, vacuum filtered, then dried at 110°C for 12 hours, and finally weighed to obtain about 3.7 g of hydrothermal coke.

[0020] It can be known from detection and analysis that the high calorific value of the prepared hydrothermal coke is about 16.48MJ / kg.

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Abstract

The invention relates to a method for preparing hydrothermal coke by utilizing municipal sewage biological sludge. The method comprises the following steps of: air-drying the municipal sewage biological sludge; grinding into 0.5-2mm of particles; putting the particles into a hydrothermal reaction kettle lined with polytetrafluoroethylene; adding distilled water and a catalyst solution; sealing; putting the hydrothermal reaction kettle into a stainless steel heating jacket; stirring; heating to be between 150 and 200 DEG C and keeping for 5-10 hours; cooling, cleaning, vacuum-filtering and drying after the end of the reaction to obtain hydrothermal coke. The method is simple in process and high in security; the municipal sewage biological sludge can be converted into hydrothermal coke with certain specific surface area and high heating value and can be used as solid fuels.

Description

technical field [0001] The invention belongs to the field of urban sewage biological sludge resource utilization, in particular to a method for preparing hydrothermal coke by using urban sewage biological sludge. Background technique [0002] The average amount of dry sludge discharged by cities in my country is expected to be as high as 6 million tons per year. The safe treatment and disposal of sludge has become one of the environmental problems that need to be solved urgently in my country. The reduction, stabilization and resource disposal of sludge have also become Major common problems restricting urban sewage treatment. [0003] It is estimated that when the sludge age of urban sewage sludge is 10 to 20 days, the biological sludge produced per unit volume of raw water can reach up to 250gTSS / m 3 . At present, the final disposal methods for urban sewage sludge mainly include landfill, composting, incineration, agricultural land utilization, etc., while the treatment o...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C02F11/00C02F11/12C10L5/46
CPCY02E50/10Y02E50/30
Inventor 高品薛罡何势周亦圆孟方黄圣琳刘路刘振鸿刘保江
Owner DONGHUA UNIV
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