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Method for improving anaerobic digestion performance of sludge and synchronously killing pathogenic microorganisms

A technology of pathogenic microorganisms and anaerobic digestion, which is applied in chemical instruments and methods, sludge treatment, biological sludge treatment, etc. It eliminates problems such as elimination and poor economy, and achieves the effect of realizing harmless treatment and resource disposal, optimizing the electron transfer process, and improving performance.

Pending Publication Date: 2021-06-01
TONGJI UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The Chinese patent "A method for reducing pathogenic microorganisms in sewage treatment plant sludge" (CN201210038805.6) discloses a method for reducing pathogenic microorganisms in sludge by using microwave pretreatment + anaerobic digestion + high-pressure carbon dioxide treatment + earthworm composting, However, the process is complicated and economical; the Chinese patent "A Method for Electrochemically Inactivating Pathogenic Microorganisms in Sludge" (CN201911384756.X) discloses a method for treating sludge using electrochemical advanced oxidation technology, but there is no guarantee that the sludge The continuous and effective killing of pathogenic microorganisms in sludge has failed to realize the recovery and utilization of resource substances in sludge

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  • Method for improving anaerobic digestion performance of sludge and synchronously killing pathogenic microorganisms

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Embodiment 1

[0046] A method for improving sludge anaerobic digestion performance and synchronously killing pathogenic microorganisms, comprising the following steps:

[0047] (1) Feed the excess sludge (2.37% total solid content, 1.25% volatile solid content) from a sewage treatment plant in Shanghai into an anaerobic digestion reactor equipped with an anode and a cathode, the anode is a platinum carbon electrode , the cathode is a graphite electrode, and the nitrogen-filled and oxygen-exhausted treatment is carried out. The working volume of the reactor is 10L, and the nitrogen flow rate is 0.2Nm 3 / h, nitrogen filling time is 5min (the reactor oxygen content is 0.8%);

[0048] (2) exposing the sludge in step (1) to a high electrochemical potential, the applied voltage value is 20V, and the application time is 2h, and the pathogenic microorganisms are inactivated and the electrochemical performance of the sludge is adjusted;

[0049] (3) Utilize the hydrochloric acid of 1mol / L to adjust...

Embodiment 2

[0053] A method for improving sludge anaerobic digestion performance and synchronously killing pathogenic microorganisms, comprising the following steps:

[0054] (1) Feed the secondary sedimentation tank sludge (2.59% total solid content, 1.66% volatile solid content) from a sewage treatment plant in Shanghai into an anaerobic digestion reactor equipped with an anode and a cathode, the anode is iron The electrode, the cathode is a platinum electrode, and the nitrogen-filled and oxygen-exhausted treatment is carried out. The working volume of the reactor is 6L, and the nitrogen flow rate is 0.4Nm 3 / h, nitrogen filling time is 2min (reactor oxygen content is 0.6%);

[0055] (2) exposing the sludge in step (1) to a high electrochemical potential, the applied voltage value is 30V, and the application time is 1h, and the pathogenic microorganisms are inactivated and the electrochemical performance of the sludge is adjusted;

[0056] (3) Utilize the sodium bicarbonate of 1mol / L t...

Embodiment 3

[0060] A method for improving sludge anaerobic digestion performance and synchronously killing pathogenic microorganisms, comprising the following steps:

[0061] (1) Feed the excess sludge (4.05% total solid content, 2.61% volatile solid content) from a sewage treatment plant in Shanghai into an anaerobic digestion reactor equipped with an anode and a cathode, the anode is an iron electrode, The cathode is a platinum electrode, which is filled with nitrogen and oxygen exhausted. The working volume of the reactor is 6L, and the flow rate of nitrogen gas is 0.3Nm 3 / h, nitrogen filling time is 2min (reactor oxygen content is 1%);

[0062] (2) exposing the sludge in step (1) to a high electrochemical potential, the applied voltage value is 10V, the application time is 4h, and the pathogenic microorganisms are inactivated and the electrochemical performance of the sludge is adjusted;

[0063] (3) Utilize the sodium bicarbonate of 1mol / L to adjust the sludge pH value of step (2) ...

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Abstract

The invention relates to the field of environmental protection and resource recovery, in particular to a method for improving anaerobic digestion performance of sludge and synchronously killing pathogenic microorganisms. According to the invention, short-time killing of pathogenic microorganisms in sludge is completed by using high electrochemical potential, and meanwhile, the electron transfer process of an anaerobic system is optimized; then the pH value is adjusted to a proper pH value range meeting anaerobic digestion, so that the growth and metabolism processes of methanogens are facilitated; and finally, functional electroactive microorganisms are enriched through low electrochemical potential, organic matter decomposition and methane generation are enhanced, the anaerobic digestion performance of the sludge is improved, and meanwhile, pathogenic microorganisms in the sludge are continuously and effectively killed.

Description

technical field [0001] The invention relates to the fields of environmental protection and resource recovery, in particular to a method for improving the anaerobic digestion performance of sludge and simultaneously killing pathogenic microorganisms. Background technique [0002] The rapid development of economy and society brings about the rapid consumption of resources, and green sustainable development and resource recovery are research hotspots all over the world. According to research reports, some pathogenic microorganisms can be transmitted through feces and may be enriched in sludge after sewage treatment. At the same time, sludge, as a "storage warehouse" for biomass, nitrogen, phosphorus and other resources in sewage, has both "pollution". " and "resource" dual attributes. Therefore, how to realize the harmless, sanitary treatment and resource utilization of sludge is an important issue to promote the construction of ecological civilization and sustainable social d...

Claims

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Application Information

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IPC IPC(8): C02F11/00C02F11/04
CPCC02F11/006C02F11/04C02F2303/04
Inventor 戴晓虎李磊蔡辰
Owner TONGJI UNIV
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