Energy regeneration method for solid organic waste alkaline thermal hydrolysis supernate

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...

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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 biogas production. Since the material contains a lot of inorganic components, it causes serious fouling in the equipment and serious wear and tear of the equipment

[0011] 4) Since the solid-liquid mixture after thermal hydrolysis directly enters the anaerobic digestion system, the entire anaerobic digestion process takes about 20 days, and the residence time is long, which eventually leads to increased equipment investment and operating costs

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