Method for recycling surplus sludge hydrothermal carbonization solution

A technology of hydrothermal carbonization and excess sludge, applied in chemical instruments and methods, water/sludge/sewage treatment, pyrolysis treatment of sludge, etc., can solve the problems of low resource utilization efficiency of the liquid phase.

Inactive Publication Date: 2018-09-21
DALIAN UNIV OF TECH
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Problems solved by technology

[0005] The purpose of the present invention is to provide an economical and efficient method for resource utilization of excess sludge based on hydrothermal carbon

Method used

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  • Method for recycling surplus sludge hydrothermal carbonization solution

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Embodiment 1

[0023] (1) Hydrothermal carbonization of excess sludge

[0024] Take the remaining sludge from the urban sewage treatment plant, adjust the concentration of the remaining sludge to 100g / L, control the temperature of the hydrothermal carbonization reactor to 240°C, and the reaction time to 3h to obtain the hydrothermal carbonization product of the sludge; After the thermal carbonization product undergoes solid-liquid separation, the hydrothermal charcoal is recovered, and the liquid phase is collected as the water phase of the next hydrothermal carbonization cycle; the liquid phase after 10 hydrothermal carbonization cycles is the hydrothermal carbonization liquid;

[0025] (2) Struvite method to recover nitrogen and phosphorus in hydrothermal carbonization liquid

[0026] Mg in the hydrothermal carbonization liquid that adjustment step (1) obtains 2+ , NH 4 + 、PO 4 3- The molar ratio is 1:1:1, the pH value is controlled at 9, and the reaction time is 30 minutes. After sol...

Embodiment 2

[0030] (1) Hydrothermal carbonization of excess sludge

[0031] Take the remaining sludge from the urban sewage treatment plant, adjust the concentration of the remaining sludge to 100g / L, control the temperature of the hydrothermal carbonization reactor to 260°C, and the reaction time to 2h to obtain the hydrothermal carbonization product of the sludge; After the thermal carbonization product undergoes solid-liquid separation, the hydrothermal charcoal is recovered, and the liquid phase is collected as the water phase of the next hydrothermal carbonization cycle; the liquid phase after 8 hydrothermal carbonization cycles is the hydrothermal carbonization liquid;

[0032] (2) Struvite method to recover nitrogen and phosphorus in hydrothermal carbonization liquid

[0033] Mg in the hydrothermal carbonization liquid that adjustment step (1) obtains 2+ , NH 4 + 、PO 4 3- The molar ratio is 1:1:1, the pH value is controlled at 9.5, and the reaction time is 30 minutes. After so...

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Abstract

The invention provides a method for recycling a surplus sludge hydrothermal carbonization solution, which belongs to the technical field of environment engineering sludge treatment. The hydrothermal carbonization solution is appropriately circularly utilized in the hydrothermal carbonization process of the surplus sludge, so that while the yield of hydrothermal carbon is increased, the high-concentration hydrothermal carbonization solution which is easy to recycle is generated, nitrogen and phosphorus in the high-concentration hydrothermal carbonization solution are recycled through a struvitemethod, and a liquid phase part is used as a denitrification supplementary carbon source in the sewage biological denitrification. The method has the beneficial effects that the zero emission of thesurplus sludge in the sewage treatment can be realized, the technical bottleneck that the low-carbon-nitrogen-ratio waste water biological denitrification efficiency is low can be effectively overcome; and moreover, the hydrothermal carbon can be used as fuel for heating a hydrothermal carbonization reactor, so that the energy self-supply can be realized, and the application prospect in the aspectof recycling the surplus sludge in an urban sewage treatment factory is wide.

Description

technical field [0001] The invention belongs to the technical field of environmental engineering sludge treatment, and relates to a method for recycling excess sludge hydrothermal carbonization liquid. Background technique [0002] With the rapid development of urban sewage treatment, the discharge of excess sludge is also increasing. As of 2012, my country's sludge (calculated with a moisture content of 80%) has exceeded 35 million tons. It is estimated that by 2020, the annual output of my country's urban sludge will exceed 60 million tons, causing huge economic and environmental pressure. The rational disposal of excess sludge has become a difficult problem that must be solved in sustainable development, and resource utilization is an ideal way to utilize excess sludge. At present, common surplus sludge recycling technologies mainly include incineration, aerobic composting, anaerobic digestion, land utilization, making building materials and environmental materials, etc....

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Application Information

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IPC IPC(8): C02F11/10C10L5/46C02F3/28C01B25/45
CPCC01B25/451C02F3/28C02F11/10C02F2305/06C10L5/46C10L2290/02Y02E50/10Y02E50/30
Inventor 王竞赵志敏王奉博
Owner DALIAN UNIV OF TECH
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