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Low energy consumption drying treatment technology of residual activated sludge

A technology of residual activity and treatment process, which is applied in the direction of sludge treatment through temperature control, dehydration/drying/concentration sludge treatment, energy wastewater treatment, etc. Problems such as low moisture content can be achieved by shortening the breaking time, reducing the dosage of chemicals, and improving the cracking efficiency

Inactive Publication Date: 2017-05-24
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The sludge treated by the invention has a low water content and good effect. The sludge is dried by using solar energy, and the cost is reduced by using resources. However, the method uses lime to condition the sludge, and the dehydration efficiency is not high, and the lime dosage is large, which increases the Subsequent processing volume
In addition, the sludge is spread in the drying room for drying, which requires mechanical reaction and the sludge cannot be treated continuously

Method used

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  • Low energy consumption drying treatment technology of residual activated sludge
  • Low energy consumption drying treatment technology of residual activated sludge
  • Low energy consumption drying treatment technology of residual activated sludge

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028]The specific embodiment of the present invention is illustrated by taking the excess sludge of a certain refinery sewage treatment plant as an example. The content analysis of the remaining sludge raw materials is shown in Table 1. Add 0.05% TS octylphenol polyoxyethylene ether and 0.02% alkyl glycoside to 200kg of the excess sludge with a water content of 96.7%, and add 1% TS hydroxyethyl hexahydro-s-triazine, start The high-speed shearing knife performs high-speed shearing and breaking of the sludge wall at a speed of 20,000r / min for 30 minutes; after the wall is broken, the sludge is subjected to centrifugal dehydration. Enter the biochemical unit of the sewage treatment plant for further treatment. After dehydration, the mud cake enters the filter press to be pressed into a 4mm strip sludge and enters the solar multi-layer mesh belt low-temperature drying box through the conveyor belt. The carrier gas is heated to 50°C by the solar tube. The humidity in the box is 8...

Embodiment 2

[0035] It is basically the same as Example 1, except that the treating agent is 0.08% TS nonylphenol polyoxyethylene ether and 0.04% alkyl glucoside, and adding 1.5% TS of hydroxyethyl hexahydro-s-triazine, dried The moisture content of the remaining sludge dropped to 11.4%. The remaining sludge volume was reduced by nearly 88%.

Embodiment 3

[0037] It is basically the same as that of Example 1, except that the inlet temperature of the solar multi-layer mesh belt type low-temperature drying box, the amount of carrier gas and the residence time in the box are adjusted. After dehydration, the mud cake enters the filter press to be pressed into 4mm strips. The sludge enters the solar multi-layer mesh belt low-temperature drying box through the conveyor belt. The carrier gas is heated to 60°C by the solar tube, the humidity in the box is 5%, and the carrier gas volume is 200m 3 / h, the residence time of the sludge in the tank is 1.5h, and the moisture content of the sludge drops to 9.3% after drying. The remaining sludge volume was reduced by nearly 87%.

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Abstract

The invention discloses a low energy consumption drying treatment technology of residual activated sludge. The treatment technology comprises the following steps: sending the residual activated sludge to a high speed shearing homogenizing tank, adding a treatment agent to the homogenizing tank, shearing and homogenizing the residual activated sludge and the treatment agent at 0-20 DEG C for 0.5-1 h, sending the obtained mixture to a sludge dehydrating machine, dehydrating the mixture to obtain a dehydrated sludge cake and sewage, sending the sewage to a sewage plant, further treating the sewage, sending the dehydrated sludge to a molding machine, extruding the dehydrated sludge to form strips, allowing the strips to enter a solar multilayer mesh belt type low temperature drying box through a conveyor belt, and drying the strips to obtain dried sludge with the water content being less than 15%. The technology decreases the water content of the residual sludge to 15% or less from 97% or above, and greatly reduces the volume of the sludge, and the dried sludge can be used as a further recycling raw material, or can be burnt.

Description

technical field [0001] The invention relates to a process for treating excess activated sludge, in particular to a process for wall-breaking dehydration and low-energy-consumption drying of excess sludge. Background technique [0002] Excess activated sludge is an inevitable product in the water treatment process. It contains many pathogenic bacteria, viruses and parasites, etc., which pose a serious threat to the surrounding environment, and the sludge moisture content is extremely high. The sludge moisture content just separated from the sedimentation tank is about 97% to 99%. High moisture content The sludge made the transportation of sludge difficult and costly, occupying a large amount of storage capacity of the landfill, and at the same time, the anti-seepage requirements of the landfill industry increased, and problems such as blockage of landfill leachate pipes were harmful to the water environment and the atmospheric environment. pose great dangers. The dehydratio...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F11/14C02F11/12C02F11/18
CPCY02W10/37
Inventor 吴巍回军杨飞飞杨丽
Owner CHINA PETROLEUM & CHEM CORP
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