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Treatment method for strengthening dewatering performance of excess activated sludge

A residual activity and sludge dehydration technology, applied in the field of resources and environment, can solve the problems of heavy metal and phosphorus dissolution, acid or alkali exceeding the standard, equipment corrosion, etc., and achieve the effect of simple equipment, short process and improved dehydration performance

Inactive Publication Date: 2013-01-02
ZHEJIANG UNIV +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, when using this method, a large amount of acid or alkali needs to be consumed, which will cause problems such as equipment corrosion, heavy metal and phosphorus leaching, acid or alkali exceeding the standard, etc.

Method used

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  • Treatment method for strengthening dewatering performance of excess activated sludge
  • Treatment method for strengthening dewatering performance of excess activated sludge
  • Treatment method for strengthening dewatering performance of excess activated sludge

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] The remaining activated sludge with a moisture content of 95.6% is transported to the jacketed enamel reaction kettle after heat exchange by a heat exchanger, and electrolyte calcium chloride is added to make the concentration of calcium chloride 9mmol / L, and the hydrothermal temperature is controlled at 85°C. Stir evenly, after 1 hour of reaction, the activated sludge is discharged from the reactor, and after heat exchange in the heat exchanger, it is input into a plate and frame filter press (BAMS 0.6 / 315-UBK type) for pressure filtration, and the moisture content of the obtained mud cake is 54.7%. .

[0024] principle such as figure 2 Shown: Under heating conditions, the flocs of the remaining activated sludge are broken, the internal negatively charged groups are exposed, and the intracellular substances are released, providing more bridging binding sites for cations. At this time, chlorine The calcium ions ionized by calcium chloride can reduce the surface charge...

Embodiment 2

[0026] The remaining activated sludge with a moisture content of 97.1% is transferred to the jacketed enamel reaction kettle after heat exchange by a heat exchanger, and electrolyte sodium chloride is added so that the concentration of sodium chloride is 72mmol / L, and the hydrothermal temperature is controlled at 60°C. Stir evenly, after 3 hours of reaction, the activated sludge is discharged from the reactor, and after heat exchange in the heat exchanger, it is input into a plate and frame filter press (BAMS 0.6 / 315-UBK type) for pressure filtration, and the moisture content of the obtained mud cake is 52.4%. .

Embodiment 3

[0028] The remaining activated sludge with a moisture content of 90.3% is transferred to the jacketed enamel reaction kettle after heat exchange by a heat exchanger, and the electrolyte magnesium chloride is added so that the concentration of magnesium chloride is 205mmol / L, and the hydrothermal temperature is controlled at 70°C. After 7 hours, the activated sludge was discharged from the reactor, and after being exchanged in the heat exchanger, it was input into a chamber filter press (XBAMQ2-6-420UBK type) for pressure filtration, and the moisture content of the obtained mud cake was 48.6%.

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Abstract

The invention discloses a treatment method for strengthening the dewatering performance of excess activated sludge, comprising the following steps of: adding electrolyte into the excess activated sludge, heating and stirring to obtain the excess activated sludge with the strengthened dewatering performance after the reaction is completed, wherein the electrolyte is at least one of sodium salt, potassium salt, calcium salt and magnesium salt. Through a normal-pressure hydrothermal electrolyte method, the dewatering speed of the excess activated sludge can be improved, the water content of the activated sludge can be obviously reduced, the treatment method is short in technology, simple in equipment requirement, and convenient to operate, and an important pretreatment condition can be provided for the follow-up treatment and disposal of the excess activated sludge.

Description

technical field [0001] The invention belongs to the technical field of resources and environment, and in particular relates to a method for strengthening the dewatering performance of surplus activated sludge. Background technique [0002] The activated sludge method has economic and technical advantages such as large processing capacity, wide application range, high organic matter removal efficiency, stable operation and low cost, and has always been the mainstream technical method of sewage treatment. Excess activated sludge is part of the activated sludge discharged after sedimentation in the activated sludge process. The process of activated sludge treatment of wastewater will inevitably produce excess activated sludge. The components of the remaining activated sludge are extremely complex, containing a large number of pathogenic bacteria, virus microorganisms, heavy metal substances and toxic organic substances, which are easy to be corrupted and have a foul smell, whic...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F11/14
Inventor 官宝红于洁邹有良
Owner ZHEJIANG UNIV
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