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Reducing and recycling treatment method for biological activated sludge

A biological activity, sludge reduction technology, applied in sludge treatment, water/sludge/sewage treatment, dehydration/drying/concentrated sludge treatment, etc., can solve secondary pollution, cannot meet environmental protection requirements, and is easily corrupted Odor and other problems, to achieve the effect of great economic benefits

Active Publication Date: 2012-07-25
中粮麦芽(大连)有限公司
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  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

China's urban sewage plants generally use belt filter press to dehydrate sludge mechanically. The moisture content of dewatered sludge is generally 85-90%. Secondary pollution, and may also cause secondary pollution during transportation, which can no longer meet environmental protection requirements
In recent years, my country has gradually increased its attention to sludge issues, and has developed some sludge treatment and disposal technologies, such as sludge thermal drying and incineration technology, sludge composting technology, and sludge digestion and power generation technology, etc., but the investment in such technologies is huge , and require the moisture content of the sludge to be below 60%, it is very difficult to implement, and it is even more difficult to treat the dispersed sludge

Method used

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  • Reducing and recycling treatment method for biological activated sludge
  • Reducing and recycling treatment method for biological activated sludge

Examples

Experimental program
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Effect test

Embodiment 1

[0018] In this example, in the sewage treatment station of COFCO Malt (Dalian) Co., Ltd., the activated sludge produced by the biochemically treated sewage enters the sludge storage tank. The sludge is characterized by a moisture content of 3 ; Chlorine dioxide is used to strengthen the sludge concentration and dehydration treatment, and the addition amount is 3kg / m 3 (calculated as available chlorine), the water content of the sludge is reduced from 98% to 95%, and the volume of the sludge is reduced from 500m 3 down to 200m 3 Add dewatering agent to sludge, dewatering agent is polyaluminum chloride and quicklime mix according to mass ratio as 1: 1 ratio, and addition is 8 kg / m 3 ; After the mixed sludge is pumped into the diaphragm plate and frame filter press through the screw pump, the pressure is kept at 0.6mpa for 1 hour, and then the diaphragm pressing system is started, and the pressure of 1.6mpa is pressed for 1 hour. The moisture content of the sludge after strong p...

Embodiment 2

[0030] The activated sludge produced by the biochemically treated sewage enters the sludge storage tank. The sludge is characterized by a water content of 3 ; Use sodium hypochlorite to strengthen the sludge concentration and dehydration treatment, the addition amount is 5kg / m 3 (calculated as available chlorine), the water content of the sludge is reduced from 98% to 95%, and the volume of the sludge is reduced from 500m 3 down to 200m 3 ;Add dehydrating agent polyacrylamide to the sludge, the addition amount is 0.5kg / m 3 ; After the mixed sludge is pumped into the diaphragm plate and frame filter press through the screw pump, it is first kept at a pressure of 0.6mpa for 1 hour, and then the diaphragm pressing system is started to press for 1 hour at a pressure of 1.8mpa. The moisture content of the sludge after strong pressing is reduced to 60%, and the sludge volume is 25m 3 ;Pile up the squeezed massive sludge naturally, and after air-drying for a week, the moisture cont...

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Abstract

The invention relates to a reducing and recycling treatment method for biological activated sludge, belonging to the sludge treatment field. The method comprises the following steps: biological activated sludge is transported to a sludge storage tank, is stirred and concentrated, and then is oxidized and disinfected by adding an oxidizing agent so as to destroy cell walls of microbes in sludge and reinforce deprivation of bound water in sludge so that the moisture content of sludge is reduced to below 95%; a dehydrating agent is added so as to increase solid compositions and improving the effect of breaking away from water; then the uniformly-mixed sludge is pumped to a diaphragm type plate-and-frame filter press to maintain pressure for strong force pressing; the pressed blocky sludge ispiled up at a ventilating place for week so as to be dried naturally till the moisture content is reduced to below 35%; and finally, the sludge is composted or mixed into coal so as to be burned in aboiler, and adsorbed water, bound water and residual void water and cellular moisture in sludge are removed during burning. The method causes the sludge to be completely reduced in weight, stabilizedand harmless and simultaneously realizes the recycling utilization of self-heating or external heating.

Description

technical field [0001] The invention belongs to the field of sludge treatment, and in particular relates to a reduction and resource treatment method for biologically active sludge produced by biochemical wastewater treatment. Background technique [0002] With the popularization of urban sewage treatment plants in China, sludge production continues to increase rapidly. China's urban sewage plants generally use belt filter press to dehydrate sludge mechanically. The moisture content of dewatered sludge is generally 85-90%. secondary pollution, and may also cause secondary pollution during transportation, which can no longer meet environmental protection requirements. In recent years, my country has gradually paid more attention to the sludge problem, and has developed some sludge treatment and disposal technologies, such as sludge thermal drying and incineration technology, sludge composting technology, and sludge digestion and power generation technology, etc., but the inv...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C02F11/00C02F11/12C02F11/14C05F7/00
CPCY02A40/20
Inventor 邱然石殿瑜佟恩杰剌向福杜宪军滕勇徐凯
Owner 中粮麦芽(大连)有限公司
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