Energy regeneration method for solid organic waste alkaline thermal hydrolysis supernate

An organic waste, energy-based technology, applied in the removal of solid waste, waste fuel, etc., can solve the problems of increased equipment investment and operating costs, no thermal hydrolysis pretreatment process, and no process practicability. , to improve the fluidity, shorten the digestion time, and achieve the effect of stabilization treatment

Inactive Publication Date: 2016-03-16
天津市裕川环境科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] 1), thermal hydrolysis is only used as a pretreatment process of anaerobic digestion, and does not have independent process feasibility or does not have thermal hydrolysis pretreatment process;
[0009] 2) The thermal hydrolysis temperature is relatively high, generally at 150-180°C, and the investment and operation costs are high
[0010] 3) After thermal hydrolysis and cooling, it directly enters the anaerobic digestion system for bi

Method used

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  • Energy regeneration method for solid organic waste alkaline thermal hydrolysis supernate
  • Energy regeneration method for solid organic waste alkaline thermal hydrolysis supernate

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0077] A method for energy conversion of supernatant liquid from thermal alkali hydrolysis of solid organic waste, comprising the following steps:

[0078] 1 ton of sludge with a moisture content of 80% + 0.32 tons of process water + 0.03 tons of calcium oxide + 0.02 tons of magnesium oxide are preheated to 70°C by direct steam heating in the deployment preheating tank, and then transported to the hydrolysis reaction by a screw pump Inside the kettle, heat up to 120°C through indirect steam heating in the hydrolysis reactor, and stay at this temperature for 100 minutes; The temperature of the hydrolyzate is lowered to 65°C, and the flash process produces 0.11 tons of flash secondary steam, all of which are reused in the deployment preheating tank for recycling. The material after flash evaporation is decalcified by sodium carbonate + hydrochloric acid to adjust the pH value to 7-9. After flash evaporation, the material is transported into a plate and frame filter press by a sc...

Embodiment 2

[0080] A method for energy conversion of solid organic waste thermal alkali hydrolysis supernatant, comprising the following steps:

[0081]0.5 tons of sludge with a moisture content of 82% + 0.5 tons of kitchen waste + 0.3 tons of process water + 0.035 tons of calcium oxide + 0.01 tons of sodium hydroxide are preheated to 90°C by steam direct heating in the deployment preheating tank , transported to the hydrolysis reactor through a screw pump, and heated to 110°C by indirect steam heating in the hydrolysis reactor, and stayed at this temperature for 120 minutes; after the reaction, the hydrolyzate was transported into the flash evaporation through the pressure of the reactor itself In the tank, the temperature of the hydrolyzate is reduced to 65°C through two-stage flash evaporation. The flash evaporation process produces 0.11 tons of flash secondary steam, all of which are reused in the deployment preheating tank for recycling. During the flashing process, carbon dioxide ga...

Embodiment 3

[0083] A method for energy conversion of supernatant liquid from thermal alkali hydrolysis of solid organic waste, comprising the following steps:

[0084] 0.8 tons of sludge with a moisture content of 80% + 0.2 tons of kitchen waste + 0.32 tons of process water + 0.02 tons of calcium oxide + 0.02 tons of magnesium oxide are preheated to 50°C by direct steam heating in the deployment preheating tank. The screw pump is transported to the hydrolysis reactor, and the temperature in the hydrolysis reactor is raised to 110°C through indirect steam heating, and stays at this temperature for 110 minutes; after the reaction is completed, the hydrolyzate is transported into the flash tank through the pressure of the reactor itself , the temperature of the hydrolyzed solution is reduced to 100°C through primary flash evaporation, and 0.05 tons of flash steam is generated during the flash evaporation process, all of which are reused in the deployment preheating tank for recycling. In the...

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Abstract

The invention relates to an energy regeneration method for solid organic waste alkaline thermal hydrolysis supernate. Solid organic waste mainly comprises kitchen waste and sludge. The energy regeneration method for the solid organic waste alkaline thermal hydrolysis supernate comprises the following steps that (1) after the organic waste, water and alkali hydrolysis agents are proportioned and mixed in a proportioning and preheating tank, heating is conducted, so that the temperature of the materials in the tank is increased to 30-99 DEG C; (2) the materials in the proportioning and preheating tank are sent into a reaction kettle through a pump for the temperature rise reaction, and finally the temperature of the materials is controlled between 100 DEG C and 140 DEG C, and the reaction continues to be conducted for 90-120 minutes; (3) the materials after the hydrolysis reaction are conveyed into a flash evaporation tank for pressure relief and cooling, so that the temperature of the materials is decreased to 50-100 DEG C; (4) clarified liquid and solid are obtained after solid-liquid separation; and (5) the liquid obtained after solid-liquid separation is delivered into an anaerobic digestion system for anaerobic digestion treatment, and thus marsh gas is generated. By the adoption of the energy regeneration method for the solid organic waste alkaline thermal hydrolysis supernate, toxin removal, stabilization, minimization and energy regeneration of the organic waste can be achieved at a time.

Description

technical field [0001] The invention relates to a method for treating organic waste, in particular to a method for converting the supernatant of organic waste into thermal alkali hydrolysis into energy. Background technique [0002] During the sewage treatment process of urban sewage treatment plants, a large amount of residual sludge and a large amount of kitchen waste generated in urban life have always been a major problem in the treatment. The conventional treatment methods are landfill, incineration, composting and anaerobic digestion. . Anaerobic digestion is mainly divided into aerobic digestion and anaerobic digestion. Aerobic digestion has the disadvantages of high energy consumption and low efficiency. Anaerobic digestion of organic waste can reduce the volume of organic waste, destroy pathogenic microorganisms, improve the solid stability of organic fertilizer and increase the biogas content. The final treatment effect of anaerobic digestion is closely related t...

Claims

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Application Information

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IPC IPC(8): B09B3/00
CPCB09B3/00Y02E50/30
Inventor 崔静左健王洪芸刘成林
Owner 天津市裕川环境科技有限公司
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