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Method and device for stabilizing chemical sludge

A technology for chemical sludge and sludge, applied in sludge treatment, sludge treatment, biological sludge treatment, etc., can solve the problem of inability to achieve sludge stabilization, shorten the sludge stabilization period, and facilitate industrial implementation. , Improve the effect of ultrasonic intensity

Active Publication Date: 2019-05-28
CHINA PETROLEUM & CHEM CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The document "Technical Research on Sludge Reduction Using Acid and Alkali" uses acid and alkali to adjust the generated sludge to achieve the purpose of sludge reduction. The organic matter dissolved by acid and alkali has not been mineralized, so it cannot be realized. Stabilization of sludge, which is different from the object of the present invention

Method used

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  • Method and device for stabilizing chemical sludge
  • Method and device for stabilizing chemical sludge

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Experimental program
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Effect test

Embodiment 1

[0034] The residual sludge of a chemical sewage treatment plant has a sludge concentration of 31.5g / L after being concentrated. The sludge is pretreated by alkaline hydrolysis with sodium hydroxide + ultrasonic, and sodium hydroxide is added to adjust the pH of the sludge mixture to 12.5 The alkaline hydrolysis stirring time is 24h, the ultrasonic frequency is 19.0kHz, the energy density is 50w / L, the ultrasonic reaction time is 300S, and the sludge breaking rate is 18%. The sludge after cracking is treated by anoxic / aerobic digestion process, the stirring time of anoxic reaction is 24h, the aeration time of aerobic reaction compressed air is 24h, and the dissolved oxygen concentration is 7.5-10mg / L. The sludge organic matter removal rate is 50%, and the sludge stabilization time is 15 days.

Embodiment 2

[0036] The residual sludge of a chemical wastewater treatment plant has a sludge concentration of 41.7g / L after being concentrated. The sludge is pretreated by alkaline hydrolysis with potassium hydroxide + ultrasonic, and potassium hydroxide is added to adjust the pH of the sludge mixture to 11.0 The alkaline hydrolysis stirring time is 11h, the ultrasonic frequency is 25.0kHz, the energy density is 30w / L, the ultrasonic reaction time is 120S, and the sludge breaking rate is 16%. The sludge after cracking is treated by anoxic / aerobic digestion process, the anoxic reaction stirring time is 12h, the aerobic reaction compressed air aeration time is 12h, and the dissolved oxygen concentration is 5-7mg / L. The removal rate of sludge organic matter was 47.8%, and the sludge stabilization time was 18 days.

Embodiment 3

[0038] The residual sludge of a chemical sewage treatment plant has a sludge concentration of 23.8g / L after being concentrated. The sludge is pretreated by alkaline hydrolysis with sodium bicarbonate + ultrasonic, and sodium bicarbonate is added to adjust the pH of the sludge mixture to 9.5 The alkaline hydrolysis stirring time is 6h, the ultrasonic frequency is 30.0kHz, the energy density is 5w / L, the ultrasonic reaction time is 30S, and the sludge breaking rate is 12.0%. The sludge after cracking is treated by anoxic / aerobic digestion process, the anoxic reaction stirring time is 8h, the aerobic reaction compressed air aeration time is 8h, and the dissolved oxygen concentration is 3-5mg / L. The sludge organic matter removal rate was 44.1%, and the sludge stabilization time was 19 days.

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Abstract

The invention belongs to the technical field of chemical sewage treatment and relates to a chemical sludge stabilization method and treatment device. The method comprises feeding condensed residual sludge into a sludge alkaline hydrolysis pot through a pipe, adding an alkaline agent into the sludge, fully mixing the sludge bacterium cells and the alkaline agent through a sludge mixer for alkaline hydrolysis, feeding the sludge mixed solution subjected to alkaline hydrolysis into an ultrosonic device, carrying out ultrasonic treatment, feeding the sludge mixed solution broken through ultrasonic treatment into a sludge digestion tank and carrying out anoxic / aerobic alternative digestion treatment through the sludge digestion tank, wherein in the anoxic / aerobic alternative digestion treatment, compressive air feeding is stopped and a mixer is started and carries out stirring in a sludge anoxic digestion stage, and stirring is stopped, compressive air is fed into the digestion product and an aeration process is carried out in a sludge aerobic digestion stage. The chemical sludge stabilization method and treatment device have high sludge degradation efficiency, reduce energy consumption, have a low sludge digestion cost and can be easily industrialized.

Description

Technical field [0001] The invention belongs to the technical field of chemical wastewater treatment, and specifically relates to a method and a treatment device for stabilizing chemical sludge. Background technique [0002] A large amount of sludge is produced during the mixed treatment of chemical wastewater, including primary sludge and excess sludge. At present, most sewage treatment plants in China adopt mixing and thickening of primary sludge and remaining sludge, and then press filter for dehydration, and transport the mud cake for disposal. The way. In recent years, as the national and local governments attach importance to environmental protection, a series of sludge treatment and disposal policies have been introduced, stipulating that chemical sludge must be stabilized and other harmless treatments before being transported and disposed of. The traditional surplus sludge stabilization technologies mainly include lime stabilization, sludge anaerobic digestion, aerobic d...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C02F11/00C02F11/02
CPCY02W10/20
Inventor 王建娜张放银李茂双潘咸峰苟社全
Owner CHINA PETROLEUM & CHEM CORP