A kind of residual activated sludge drying processing method

A processing method and residual activity technology, applied in chemical instruments and methods, sludge treatment, water/sludge/sewage treatment, etc., can solve the problems of limited drying efficiency, reduce drying energy consumption and improve activity , the effect of accelerating dissolution

Active Publication Date: 2021-12-07
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the invention does not pretreat the sludge, and the drying efficiency is limited

Method used

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  • A kind of residual activated sludge drying processing method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] The specific embodiment of the present invention will be described by taking the excess sludge of a certain sewage treatment plant as an example. Add 200kg of excess sludge with a moisture content of 96.40% to the electrolytic cell, add 2% TS sludge (TS is the total solid content of sludge) sodium perchlorate and 3% TS sludge triphosphate Butyl ester, and after adding 2% polymyxin of TS sludge, acted at 20mA / cm2, 400HZ for 1.5h, the VSS reduction rate of the sludge after breaking the wall was 38.29%, and the SCOD increased by 36.52 times of the original sludge. After the wall is broken, the sludge is subjected to centrifugal dehydration. After dehydration, the moisture content of the sludge is 65.61%. The sewage is discharged into the biochemical unit of the sewage treatment plant for further treatment. After dehydration, the mud cake enters the filter press to be pressed into 4mm strips of sludge and is transported The belt enters the solar multi-layer mesh belt low-te...

Embodiment 2

[0031] Basically the same as Example 1, the difference is that the treatment agent is sodium perchlorate of 0.2% TS sludge and tributyl phosphate of 0.35% TS sludge and colistin of 0.13% TS sludge. The sludge VSS reduction rate was 32.07%, and the SCOD increased 31.79 times of the original sludge. The moisture content of the sludge after wall breaking and dehydration reaches 68.50%, and the moisture content of the remaining sludge after final drying drops to 12.94%.

Embodiment 3

[0033] Basically the same as Example 1, the difference is that the treatment agent is sodium perchlorate of 1%TS sludge and tributyl phosphate of 1.5%TS sludge, polymyxin and 0.5%TS of 0.5%TS sludge The colistin in the sludge, the VSS reduction rate of the sludge after breaking the wall was 42.54%, and the SCOD increased by 40.74 times of the original sludge. The moisture content of the sludge after wall breaking and dehydration reaches 62.47%, and the moisture content of the remaining sludge after final drying drops to 10.76%.

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Abstract

The invention discloses a processing method for drying excess activated sludge. In the processing method, firstly, the excess activated sludge is sent into an electrolytic cell, then a treatment agent is added into the electrolytic cell, and after treatment, it is sent to a sludge dewatering machine for dehydration. , to obtain dehydrated cake and sewage, the sewage is sent to the sewage plant for further treatment, the obtained dehydrated cake is sent to the molding machine to be extruded into strips, and then enters the solar multi-layer mesh belt type low-temperature drying box through the conveyor belt for drying. A dried sludge with a moisture content of less than 15% is obtained. The process of the invention can reduce the moisture content of the remaining sludge to below 15%, greatly reducing the volume of the sludge, and the dried sludge can be used as a raw material for further recycling or incinerated.

Description

technical field [0001] The invention relates to a process for drying 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 process of sewage treatment. Its composition is complex. It is composed of bacterial micelles formed by various microorganisms and organic matter adsorbed. In addition to containing a large amount of water, it also contains refractory organic matter, volatile substances, and heavy metals. and salts, as well as pathogens and parasite eggs, etc., if not handled and disposed of in time, will cause secondary pollution to the environment. Due to the serious phenomenon of "heavy water and light mud" in the construction of sewage treatment plants in my country, a large amount of sludge has been "backlogged" and has not been treated and disposed of reasonably and safely. During the construction of s...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C02F11/00C02F11/13C02F11/122C02F11/123C02F11/127C02F11/125
Inventor 吴巍回军孙浩程刘春阳李宝忠
Owner CHINA PETROLEUM & CHEM CORP
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