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High-efficiency and low-consumption device for improving hydrolytic acidification effect of excess sludge and operation method thereof

A technology for hydrolysis and acidification of sludge and hydrolysis and acidification, which is applied in chemical instruments and methods, water/sludge/sewage treatment, sludge treatment, etc., can solve the problem of low volatile fatty acid production, high energy and chemical consumption, and high equipment requirements. To achieve the effect of enhancing and enriching, improving contact efficiency, and improving microbial activity

Active Publication Date: 2022-04-08
NANJING UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The technical problem solved by the present invention is: the effect of converting the sludge particulate pollutants existing in the process of sludge hydrolysis and acidification into dissolved organic matter is poor, the yield of volatile fatty acids is low, and the current pretreatment technology and bioaugmentation technology consume energy Due to the shortcomings of high chemical consumption, high equipment requirements, and poor applicability in actual projects, a device and its operation method for improving the effect of hydrolysis and acidification of excess sludge with high efficiency and low consumption are provided. On the basis of ensuring the improvement of sludge hydrolysis and acidification efficiency, it can Effectively reduce energy consumption and chemical consumption in the treatment process, more convenient operation and management, and stable process operation

Method used

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  • High-efficiency and low-consumption device for improving hydrolytic acidification effect of excess sludge and operation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] In this example, a set of small-scale experimental equipment is used. The excess sludge to be treated is taken from the secondary sedimentation tank of a certain urban sewage treatment plant. The sludge concentration is 19.7±0.7g / L, the total COD of the sludge is 17.1±1.1g / L, and the pH is 6. 8-7.2, soluble COD169-264mg / L. The remaining sludge directly enters the sludge hydrolysis acidification tank 3 through the adjustment tank 1, the included angle between the baffle plate 5 and the vertical surface of the sludge hydrolysis acidification tank 3 is 15°, and the ratio of the height of the baffle plate 5 to the height of the tank body is 15% , the unit weight of the soft biological carrier fixed on the board is 2.0kg / m 3, the fiber bundle length is 60mm, the bundle diameter is 0.3mm, the distance between bundles is 10mm, and the porosity is >99%. Bottom 2cm; The ratio of the diameter of the fast stirrer 7 of the outer circulation weak alkali fast stirring tank 8 to the ...

Embodiment 2

[0027] The difference from Example 1 is that the treated excess sludge is taken from the secondary settling tank of another urban sewage treatment plant, the sludge concentration is 23.21±0.62g / L, the volatile suspended solid concentration is 14.34±0.41g / L, and the SCOD is 317.9 ±36.03mg / L, TCOD20.88±1.13g / L, pH 7.3. The remaining sludge directly enters the sludge hydrolysis acidification tank 3 through the regulating tank 1, the included angle between the baffle plate 5 and the vertical surface of the sludge hydrolysis acidification tank 3 is 20°, and the ratio of the height of the baffle plate 5 to the height of the tank body is 10%. The unit weight of the soft biological carrier fixed on the board is 1.8kg / m 3 , the length of the fiber bundle is 100mm, the diameter of the bundle is 0.45mm, the distance between the bundles is 15mm, and the porosity is >99%. Bottom 3cm; The ratio of the diameter of the fast stirrer 7 of the outer circulation weak alkali fast stirring tank 8 ...

Embodiment 3

[0029] The difference from Example 1 is that the excess sludge to be treated is taken from the sludge concentration tank of an urban sewage treatment plant, the sludge concentration is 53.17±2.04g / L, the concentration of volatile suspended solids is 27.19±1.43g / L, and the SCOD is 639.4 ±51.28mg / L, TCOD 39.62±2.91g / L, pH 6.8. The remaining sludge directly enters the sludge hydrolysis acidification tank 3 through the regulating tank 1, the included angle between the baffle plate 5 and the vertical surface of the sludge hydrolysis acidification tank 3 is 30°, and the ratio of the height of the baffle plate 5 to the height of the tank body is 10%. The unit weight of the soft biological carrier fixed on the board is 2.0kg / m 3 , fiber bundle length 80mm, bundle filament diameter 0.35mm, distance between bundles 25mm, porosity > 99%; mechanical stirring paddle 4 blade inclination angle is 45°, ratio of diameter to tank diameter is 0.8, distance from sludge hydrolysis acidification ta...

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Abstract

The invention discloses a high-efficiency low-consumption device for improving the hydrolytic acidification effect of excess sludge and an operation method thereof.The device comprises a sludge adjusting pool, a sludge hydrolytic acidification tank and an outer circulation weak base rapid stirring tank and is further provided with a sludge inlet pump, a one-way timing valve, an alkali dosing tank, a rapid stirrer, a pH meter and an outer circulation pump; a baffle plate is arranged at the middle upper part of the sludge hydrolytic acidification tank, a soft biological carrier is arranged on the plate surface, a mechanical stirring paddle is arranged at the middle lower part of the sludge hydrolytic acidification tank, and the external circulation weak base rapid stirring tank is provided with a sludge inlet pipe and a sludge return pipe, and is also provided with an alkali dosing pipe and a rapid stirrer. Compared with the prior art, the volume of the hydrolytic acidification tank is small, the hydrolytic acidification efficiency of organic matters in the sludge is high, and stable, economical and efficient operation effects are achieved under the conditions of low energy consumption and low drug consumption.

Description

technical field [0001] The invention relates to the technical field of excess sludge treatment, in particular to a device for improving the effect of hydrolysis and acidification of excess sludge with high efficiency and low consumption and an operation method thereof. Background technique [0002] With the increase of urban sewage treatment volume, the generation of excess sludge in sewage treatment plants in my country is also increasing year by year. Excess sludge contains pathogenic microorganisms, a large amount of organic matter and nitrogen and phosphorus nutrients. If it is not properly disposed of, it will pose a major threat to the ecological environment and human health. In recent years, countries and regions have successively issued a series of policies and plans on strengthening the treatment and disposal of excess sludge. Therefore, it is imminent to find an efficient and economical method for the treatment and disposal of excess sludge. [0003] Anaerobic di...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F11/04C02F11/122C02F11/14
CPCY02W10/10Y02E50/30
Inventor 马思佳杨东丽许柯任洪强
Owner NANJING UNIV
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