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Anaerobically digested sludge pyrohydrolysis-ultrasonic combined pretreatment method

An anaerobic digestion and thermal hydrolysis technology, applied in water/sludge/sewage treatment, sludge treatment, chemical instruments and methods, etc., can solve problems such as high energy consumption, complicated operation and management, and slow reaction speed, and achieve The effect of reducing energy consumption, increasing hydrolysis rate and shortening time

Active Publication Date: 2013-11-13
QINGDAO TECHNOLOGICAL UNIVERSITY
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Problems solved by technology

[0004] Aiming at the shortcomings of the existing traditional sludge anaerobic digestion technology, such as slow reaction speed, high energy consumption, long treatment cycle, bulky tank body, complicated operation and management, and low methane content in gas production, the present invention provides a Combined thermal hydrolysis and ultrasonic pretreatment method of anaerobic digested sludge with fast reaction speed, low energy consumption and high anaerobic digestion efficiency

Method used

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Embodiment Construction

[0016] The present invention adopts thermal hydrolysis and ultrasonic combined method to pretreat anaerobic digestion sludge, and the specific process is as follows:

[0017] (1) Sludge preheating stage:

[0018] The concentrated (water content 91%) sludge is pumped into the sludge preheating device from the sludge storage tank, and the sludge after the thermal hydrolysis reaction in step (2) is used for heat recovery through a heat exchanger, and the recovered heat It is reused in the sludge preheating device, and the heat recovered from the thermal hydrolysis reaction tank is used to mix with the sludge to raise the temperature of the sludge to 50°C-60°C;

[0019] (2) Sludge thermal hydrolysis pretreatment stage:

[0020] The thermal hydrolysis pretreatment of sludge is completed through a thermal hydrolysis reaction system. The thermal hydrolysis reaction system consists of two parts: a steam generator and a thermal hydrolysis reaction tank. The steam generator is a steam ...

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Abstract

The invention relates to an anaerobically digested sludge pyrohydrolysis-ultrasonic combined pretreatment method which comprises the following steps: (1) preheating concentrated sludge to 50-60 DEG C; (2) pumping the preheated sludge into a pyrohydrolysis reaction tank, continuously introducing hot steam generated by a steam generator into the pyrohydrolysis reaction tank, and keeping the temperature in the pyrohydrolysis reaction tank at 118-122 DEG C for 30 minutes, wherein the volume of the sludge does not exceed one half of the volume in the tank body; and (3) cooling the sludge subjected to pyrohydrolysis pretreatment to 50 DEG C with a heat exchanger, and carrying out ultrasonic treatment in an ultrasonic reactor for 30-60 minutes, wherein the ultrasonic frequency is 20-28 KHz, and the sound energy density is 0.33 W / mL. By adopting the pyrohydrolysis-ultrasonic combined pretreatment method, the invention can enhance the hydrolysis rate of the sludge, and lower the energy consumption for operation by using comprehensive allocation of heat.

Description

technical field [0001] The invention relates to a method for pretreating anaerobic digestion sludge, and belongs to the technical field of anaerobic digestion sludge pretreatment. Background technique [0002] For the treatment and disposal of sludge generated by urban sewage treatment plants, the main methods can be divided into 34 kinds of technologies: aerobic digestion, anaerobic digestion, sludge drying, chemical stabilization, composting, incineration and landfill. Compared with the anaerobic digestion process, other sludge treatment and disposal methods have problems such as poor sludge stability, high process energy consumption, poor sludge dehydration performance, and weak inactivation effect on pathogenic microorganisms. Through a comprehensive evaluation of the maturity, technical superiority and economics of various processes, it is found that anaerobic digestion is an advantageous technology from the perspectives of economy, resource recovery and sustainable dev...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C02F11/00
Inventor 刘长青冉小珊廖足良毕学军程丽华张峰
Owner QINGDAO TECHNOLOGICAL UNIVERSITY
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