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Method for conditioning urban sewage plant excess sludge through ultrasound and Fenton cooperation

A technology for excess sludge and urban sewage, applied in dehydration/drying/concentration sludge treatment, sludge treatment, chemical instruments and methods, etc., can solve the problems of weak hydrolysis of solid debris, low efficiency, high operating costs, etc. Achieve the effects of facilitating subsequent sludge treatment, broad application prospects, and reducing moisture content

Inactive Publication Date: 2017-02-01
FUZHOU UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, it also has the problems of weak hydrolysis of solid debris after promoting cell breakdown and high operating costs.
However, if the biological conditioning method is used alone, it has the disadvantage of low efficiency. The aerobic digestion method generally takes about 20 days, while the anaerobic digestion method takes 30 to 40 days.

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  • Method for conditioning urban sewage plant excess sludge through ultrasound and Fenton cooperation

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035] Embodiment 1: Treatment of excess sludge in the thickening tank of the urban sewage treatment plant operated by the circulating activated sludge method (CASS) as the biochemical treatment process.

[0036] The sludge specific resistance (SRF) of the sewage plant is greater than 1×10 12m / kg, it is not suitable for direct mechanical dehydration and needs to be pretreated. The moisture content of the raw sludge is high, and it is still about 72% after dehydration, which does not meet the requirements for the moisture content of the landfill sludge in the "Sludge Disposal of Municipal Sewage Treatment Plant Mixed Landfill Mud" (GB / T 23485-2009) . The ratio of MLVSS to MLSS in the thickened sludge mixture is about 0.45, indicating that the organic matter content in the sludge of this plant is relatively low. At the same time, the SCOD in the sludge is only 55-70 mg / L, indicating that the dissolved organic matter in the sludge itself is less. It has a low binding force wit...

Embodiment 2

[0038] Embodiment 2: Treating the excess sludge in the thickening tank of the urban sewage treatment plant operated with the A / O process as the biochemical treatment process.

[0039] Analysis of the characteristics of the sludge in this plant shows that its SRF is greater than 1×10 13 m / kg, which belongs to the difficult-to-dewater sludge, and the moisture content is still greater than 75% after direct dehydration without conditioning, which does not meet the requirements specified in the "Mud Quality for Mixed Landfill Sludge Disposal in Urban Sewage Treatment Plants" (GB / T23485-2009). Requirements for moisture content of buried sludge. The sludge MLVSS / MLSS is about 0.68, indicating that the organic matter content in the sludge is relatively high, but at the same time, the SCOD is 195.65 mg / L, and the organic matter dissolved in the sludge itself is less, and a large amount of organic matter is in the form of cell inclusions or floc structures. , The form of cell structur...

Embodiment 3

[0041] Example 3: Treatment of excess sludge in a concentration tank of an urban sewage treatment plant operated with a Carrousel oxidation ditch delayed aeration activated sludge treatment process as a biochemical treatment process.

[0042] The SRF of the sludge from the sewage plant is greater than 1×10 13 m / kg, which is also difficult to dewater sludge, and the water content after dehydration exceeds 80%, which does not meet the requirements for landfill sludge in the "Sludge Disposal of Municipal Sewage Treatment Plants for Mixed Landfill" (GB / T 23485-2009). Requirements for water content The sludge MLVSS / MLSS is about 0.61. The organic matter content in the sludge is relatively high. At the same time, the SCOD is about 400 mg / L. The sludge itself can dissolve more organic matter, and the other part of the organic matter is the cell content Or the form of floc structure and cell structure exists in the sludge, and the water is bound between the structures and it is diffi...

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Abstract

The invention relates to a method for conditioning urban sewage plant excess sludge through ultrasound and Fenton cooperation. The method includes the following steps that S1, the pH value of excess sludge is adjusted to be 2.0-4.0; S2, a Fenton reagent is added into the excess sludge, wherein the Fenton reagents comprises ferrous sulfate with the saturation humidity ratio being 0.5-1.50 g / kgDS and hydrogen peroxide with the saturation humidity ratio being 15-30 g / kgDS; S3, the flow state of the excess sludge is kept through stirring, and an ultrasonic probe is immersed below the liquid level of the excess sludge; S4, ultrasonic frequency is adjusted to be 20-40 kHz, sound energy density is adjusted to be 0.07-0.10 W / mL, ultrasound time is set to be 20-240 s, and the ultrasonic probe is started for reaction; S5, after the ultrasound time is up, the ultrasonic probe is taken out from the excess sludge, the remaining sludge continues to react, and reaction time is 0.25-2 h; S6, after the reaction time is up, conditioning of the excess sludge is finished. The method reduces consumption of the Fenton reagent and ultrasonic conditioning consumption. Meanwhile, dewaterability of the excess sludge is further improved.

Description

technical field [0001] The invention relates to a method for cooperating with ultrasonic and Fenton to regulate excess sludge in urban sewage plants. Background technique [0002] Aerobic biological method is currently a relatively mature secondary treatment process for urban sewage. It removes organic matter through the metabolism of microorganisms. At the same time, the biomass continues to increase in this process. It is necessary to discharge excess sludge and shed biofilm to maintain biological treatment. stable biomass in the system. As of the end of June 2015, a total of 3,802 sewage treatment plants have been built in cities and counties across the country, with a treatment capacity of 161 million m 3 / d. By 2015, the annual production of wet sludge (with a moisture content of 80%) in urban sewage treatment plants across the country will exceed 33.59 million tons. The large amount of sludge puts a very high pressure on the environment. The moisture content of the...

Claims

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Application Information

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IPC IPC(8): C02F11/14C02F11/00
CPCC02F11/14C02F11/00C02F2305/026
Inventor 张新颖郑林虹林瑜琳邱凌峰
Owner FUZHOU UNIV
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