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A method of combining ultrasonic waves and photosynthetic bacteria to promote the digestion of excess sludge

A technology of photosynthetic bacteria and excess sludge, applied in chemical instruments and methods, sludge treatment, biological sludge treatment, etc., can solve the problems of environmental secondary pollution, achieve high reduction efficiency, high degree of cracking, and degradation full effect

Active Publication Date: 2016-05-25
NORTHEASTERN UNIV LIAONING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] With the acceleration of my country's urbanization process and the increase in the treatment rate of urban domestic wastewater, the total amount of excess sludge has also increased rapidly; however, excess sludge contains a large number of microorganisms, suspended solids and other organic matter, if not properly treated and disposed of, Will cause secondary pollution to the environment
At present, mainly by changing the operation process of sewage treatment, or by using certain physical and chemical means to enhance the recessive growth of microorganisms using secondary substrates, and to minimize the output of excess sludge on the premise of ensuring that the effluent water quality is not affected , but dehydration and landfill of excess sludge is still the final treatment method of sewage treatment enterprises

Method used

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  • A method of combining ultrasonic waves and photosynthetic bacteria to promote the digestion of excess sludge

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Experimental program
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Effect test

Embodiment 1

[0037] 1) Combined pretreatment of anaerobic bacteria and ultrasound

[0038] Input 4L of excess sludge with a concentration of 8000mg / L into a 5L anaerobic reactor, a large number of aerobic microorganisms in the excess sludge will die and dissolve under anaerobic conditions, and use the anaerobic microorganisms and facultative The microorganisms perform anaerobic digestion on the remaining sludge at room temperature. After 48 hours of anaerobic digestion, the remaining sludge after anaerobic digestion is input into an ultrasonic processor for ultrasonic treatment for 30-60 minutes. The ultrasonic frequency of the ultrasonic processor is 20kHz. Density 15W / cm 2 ;

[0039]2) Anaerobic digestion promoted by ultrasound and photosynthetic bacteria

[0040] In step 1), the sludge after ultrasonic treatment is input into the 28L anaerobic reactor containing EM bacteria for water purification, and the concentration of photosynthetic bacteria in the bacterium liquid of EM bacteria ...

Embodiment 2

[0047] After the surplus sludge of embodiment 1 completes the entire digestion process, according to the same steps and parameters as in embodiment 1, new surplus sludge and the unfiltered liquid slurry processed in step 3) are input to step 1 of embodiment 1 ) the input speed of the anaerobic reactor is controlled at 2L / d, and the output speed is also 2L / d, so that the residence time in the anaerobic reactor of step 1) is 48h; the sludge input after step 1) treatment To step 2) the input speed of the anaerobic reactor is controlled at 2L / d, and the output speed of the anaerobic fermentation broth is 5L / d, so that its residence time in the anaerobic reactor of step 2) is 5d; The input speed of the reaction tank of input step 3) is controlled at 5L / d, and the output speed is about 12.5L / d, so that the residence time in the reaction tank described in step 3 is 36h.

[0048] The process has a digestibility rate of 52.8% for the remaining sludge.

Embodiment 3

[0050] 1) Combined pretreatment of anaerobic bacteria and ultrasound

[0051] Input 9L of excess sludge with a concentration of 10000mg / L into a 10L anaerobic reactor, and a large number of aerobic microorganisms in the excess sludge will die and dissolve under anaerobic conditions, and at a stirring speed of 500-800rpm, use The anaerobic microorganisms and facultative microorganisms in the sludge anaerobically digest the remaining sludge at room temperature for 72 hours. During the digestion period, the remaining sludge after anaerobic digestion is input into an ultrasonic processor for ultrasonic treatment for 30-60 minutes. Ultrasonic frequency 28kHz, ultrasonic density 20W / cm 2 ;

[0052] 2) Anaerobic digestion promoted by ultrasound and photosynthetic bacteria

[0053] The sludge after ultrasonic treatment was input into a 75L anaerobic reactor containing EM bacteria for water purification, and the concentration of photosynthetic bacteria in the bacterial solution of EM...

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Abstract

The invention provides a method for promoting excess sludge digestion by using combination of ultrasonic waves and photosynthetic bacteria aiming at a high-efficiency excess sludge treatment technology which needs to the developed and has high engineering popularization value in the prior art. The method belongs to the technical fields of excess sludge recycling and reduction. According to the method, the reduction, harmlessness and recycling are taken as the principles, an anaerobic and ultrasonic combined pretreatment mode is adopted, an anaerobic reaction promoted by low-energy ultrasonic waves and photosynthetic bacteria is adopted, an aerobic reaction promoted by low-energy ultrasonic waves and photosynthetic bacteria is adopted, a reflux technology is adopted, and a set of high-efficiency treatment process aiming at the excess sludge is provided. According to the method, water in the sludge can be separated and discharged, the organic matters are released in the forms of CO2, CH4 and H2, the energy is consumed by microbes, the recycling efficiency of the excess sludge is improved, the primary treatment time is shortened to 8.5 days, the digestion efficiency is improved to 60 percent, and the zero emission or ultra-low emission aim of the sludge is achieved.

Description

technical field [0001] The invention belongs to the technical field of resource utilization and reduction of excess sludge, and in particular relates to a method for promoting the digestion of excess sludge by combining ultrasonic waves and photosynthetic bacteria. Background technique [0002] Excess sludge is produced during sewage treatment. During the biochemical treatment process, the microorganisms in the activated sludge continuously consume the organic matter in the wastewater. Among the consumed organic matter, a part of the organic matter is oxidized to provide the microbial life activities. The energy of the other part of the organic matter is used by microorganisms to synthesize new cytoplasm, so that the microorganisms reproduce, so a large amount of excess sludge is produced. [0003] With the acceleration of my country's urbanization process and the increase in the treatment rate of urban domestic wastewater, the total amount of excess sludge has also increase...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C02F11/04C02F11/00C02F9/14
CPCY02E50/30
Inventor 谢元华李现瑾朱彤朱曜南
Owner NORTHEASTERN UNIV LIAONING
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