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Energy reclaiming sludge reduction method

A technology for sludge reduction and energy recovery, applied in energy wastewater treatment, biological sludge treatment, biochemical equipment and methods, etc., can solve the problems of long residence time, slow digestion rate, low treatment efficiency, etc. Effects of slime reduction, promotion of dissolution, and improvement of anaerobic digestion performance

Inactive Publication Date: 2010-11-10
王鹤立
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Problems solved by technology

[0004] In order to overcome the shortcomings of the traditional sludge anaerobic digestion process, such as slow digestion rate, long residence time, and low treatment efficiency, the present invention adopts thermal hydrolysis as a pretreatment process coupled with a two-phase anaerobic digestion process, and the residual sludge Energy recovery while reducing waste

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Embodiment approach

[0021] The remaining sludge of the urban sewage plant first enters the thermal hydrolysis reactor (2) through the sludge inlet pipe (1), and the temperature is controlled between 110°C and 200°C, the pressure is between 600 and 2500kPa, and the reaction time is 15 to 60 minutes. Pretreatment of the excess sludge under certain conditions; the excess sludge after thermal hydrolysis treatment enters the acid-producing phase reactor (4) through the sludge inlet pipe (3), and the temperature of the acid-producing phase is adjusted to 31-36°C or 50°C ~55℃, pH value is 4.5~6.0, redox potential is -300~-100mV, and the substrate concentration, organic load, hydraulic retention time and alkalinity are effectively controlled, and the acid production phase is controlled in the ethanol fermentation stage. Finally, the hydrogen in the product is recovered through the hydrogen collection device (5), and other products enter the closed methanogenic phase reactor through the mud inlet pipe (6) ...

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Abstract

The invention provides an energy reclaiming sludge reduction method in order to overcome the defects that the conventional sludge reduction technology has high running cost, long treatment period and the like. Thermal hydrolysis serving as pretreatment is coupled with two-phase anaerobic digestion to perform reduction treatment on the excess sludge. Ethanol type zymophyte is cultured and domesticated by using the excess sludge after the thermal hydrolysis pretreatment as matrix, an acid generating phase is controlled at an ethanol type fermentation stage, ethanol type fermentation products mainly comprise ethanol, acetic acid and hydrogen, and the ethanol type fermentation products after entering a methane generating phase can be easily utilized by methane generating bacteria and transformed into methane. The method can effectively improve the sludge reduction effect, and can reclaim clean energy such as hydrogen, methane and the like.

Description

technical field [0001] The invention relates to an energy recovery type sludge reduction method, which belongs to the technical field of solid waste treatment. Background technique [0002] With the acceleration of my country's urbanization process and the rapid development of society, the rate of urban sewage treatment has gradually increased. The country's increased investment in environmental governance has also promoted the development of the sewage treatment industry. At the same time, the sewage treatment process also produces a large amount of excess sludge. According to statistics, more than 10 million tons of dewatered sludge with a moisture content of 80% are produced nationwide every year. Sludge contains a variety of harmful substances, such as heavy metal ions, refractory organic matter, persistent organic matter, and pathogenic microorganisms. Coupled with strict restrictions on relevant environmental standards and laws and regulations, the treatment and dispo...

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Application Information

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IPC IPC(8): C02F11/04C12M1/107
CPCC12M21/04Y02E50/343C12M45/06C12M23/58Y02E50/30Y02W10/30
Inventor 白杨李广王鹤立韩冰
Owner 王鹤立
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