A kind of advanced treatment method of excess sludge

Abstract

The invention discloses a deep treatment method of excess sludge and belongs to the field of sludge treatment. According to the method, dewatering deep treatment is performed on the excess sludge produced during sewage treatment through steps of sludge blending, pretreatment, thermophilic anaerobic digestion, deep dewatering and the like, the solid content of the dewatered sludge can reach 40%-50%, and the reduction, the stabilization, the harmlessness and the recycling of the sludge are realized.

Description

technical field

[0001] The invention relates to a treatment method for sludge, in particular to an advanced treatment method for excess sludge, and belongs to the field of sludge treatment. Background technique

[0002] Sludge is the final product of sewage treatment, with high concentration of pollutants, complex components, high organic matter content, strong hydrophilicity, large specific surface area, difficult dehydration, and low mechanical dehydration efficiency. At present, more than 80% of the sludge in our country's urban sewage treatment plants has not been effectively disposed of. Most sewage treatment plants only add chemical agents (PAM, etc.) to condition the sludge and then perform mechanical dehydration, but the simple use of chemical agents can only increase the dehydration speed of the sludge, but cannot increase the degree of dehydration, and the final moisture content of the sludge remains the same. up to 80%. This kind of dewatered sludge is still in ...

Examples

Embodiment 1

[0029] 1. Sludge preparation: the dewatered sludge (taken from the sludge dewatering room of the sewage treatment station of Shandong New Times Pharmaceutical Co., Ltd., with a solid content of 14%, a pH of 6.8, and organic components in the solids accounting for 53%) and the remaining sludge (The sludge concentration tank of the sewage treatment station of Shandong New Times Pharmaceutical Co., Ltd. has a solid content of 2%, a pH of 6.9, and organic components in the solids account for 57%) to the sludge blending tank at a weight ratio of 1:1. Mixed sludge (8% solid content, 6.8 pH, 54% organic components in solids) was obtained after stirring and mixing.

[0030] 2. Pretreatment: The mixed sludge first passes through the ultrasonic treatment device, the ultrasonic treatment frequency is 40kHz, and the treatment time is 10min; then it enters the heat treatment device, the heat treatment temperature is 55°C, and the treatment time is 3.0h.

[0031] 3. High-temperature anaerob...

Embodiment 2

[0034] 1. Sludge deployment: Combine dewatered sludge (Shandong New Times Pharmaceutical Co., Ltd. sewage treatment station sludge dehydration room, solid content 19%, pH 6.7, organic components in solids account for 55%) and excess sludge (Shandong The sludge thickening tank of the sewage treatment station of New Times Pharmaceutical Co., Ltd., with a solid content of 1%, a pH of 6.9, and organic components in the solids account for 58%) is added to the sludge blending tank at a weight ratio of 1:1, and is fully stirred by mechanical stirring. After mixing, mixed sludge (10% solid content, pH 6.8, 55% organic components in solids) was obtained.

[0035] 2. Pretreatment: The mixed sludge first passes through the ultrasonic treatment device, the ultrasonic treatment frequency is 20kHz, and the treatment time is 60min; then it enters the heat treatment device, the heat treatment temperature is 70°C, and the treatment time is 1.0h.

[0036] 3. High-temperature anaerobic digestion...

Embodiment 3

[0039] 1. Sludge preparation: The raw sludge (taken from the sludge dehydration room of the sewage treatment station of Shandong New Times Pharmaceutical Co., Ltd., with a solid content of 23%, a pH of 7.0, and organic components in the solids accounting for 56%) and the remaining sludge (The sludge concentration tank of the sewage treatment station of Shandong New Times Pharmaceutical Co., Ltd. has a solid content of 2%, a pH of 6.9, and organic components in the solid account for 61%). Mixed sludge (9% solid content, 6.9 pH, 57% organic components in solids) was obtained after stirring and mixing.

[0040] 2. Pretreatment: The mixed sludge first passes through the ultrasonic treatment device, the ultrasonic treatment frequency is 28kHz, and the treatment time is 30 minutes; then it enters the heat treatment device, the heat treatment temperature is 60°C, and the treatment time is 2 hours.

[0041] 3. High-temperature anaerobic digestion: The pretreated sludge enters the high...

technical field

[0001] The invention relates to a treatment method for sludge, in particular to an advanced treatment method for excess sludge, and belongs to the field of sludge treatment. Background technique

[0002] Sludge is the final product of sewage treatment, with high concentration of pollutants, complex components, high organic matter content, strong hydrophilicity, large specific surface area, difficult dehydration, and low mechanical dehydration efficiency. At present, more than 80% of the sludge in our country's urban sewage treatment plants has not been effectively disposed of. Most sewage treatment plants only add chemical agents (PAM, etc.) to condition the sludge and then perform mechanical dehydration, but the simple use of chemical agents can only increase the dehydration speed of the sludge, but cannot increase the degree of dehydration, and the final moisture content of the sludge remains the same. up to 80%. This kind of dewatered sludge is still in ...

Examples

Embodiment 1

[0029] 1. Sludge preparation: the dewatered sludge (taken from the sludge dewatering room of the sewage treatment station of Shandong New Times Pharmaceutical Co., Ltd., with a solid content of 14%, a pH of 6.8, and organic components in the solids accounting for 53%) and the remaining sludge (The sludge concentration tank of the sewage treatment station of Shandong New Times Pharmaceutical Co., Ltd. has a solid content of 2%, a pH of 6.9, and organic components in the solids account for 57%) to the sludge blending tank at a weight ratio of 1:1. Mixed sludge (8% solid content, 6.8 pH, 54% organic components in solids) was obtained after stirring and mixing.

[0030] 2. Pretreatment: The mixed sludge first passes through the ultrasonic treatment device, the ultrasonic treatment frequency is 40kHz, and the treatment time is 10min; then it enters the heat treatment device, the heat treatment temperature is 55°C, and the treatment time is 3.0h.

[0031] 3. High-temperature anaerob...

Embodiment 2

[0034] 1. Sludge deployment: Combine dewatered sludge (Shandong New Times Pharmaceutical Co., Ltd. sewage treatment station sludge dehydration room, solid content 19%, pH 6.7, organic components in solids account for 55%) and excess sludge (Shandong The sludge thickening tank of the sewage treatment station of New Times Pharmaceutical Co., Ltd., with a solid content of 1%, a pH of 6.9, and organic components in the solids account for 58%) is added to the sludge blending tank at a weight ratio of 1:1, and is fully stirred by mechanical stirring. After mixing, mixed sludge (10% solid content, pH 6.8, 55% organic components in solids) was obtained.

[0035] 2. Pretreatment: The mixed sludge first passes through the ultrasonic treatment device, the ultrasonic treatment frequency is 20kHz, and the treatment time is 60min; then it enters the heat treatment device, the heat treatment temperature is 70°C, and the treatment time is 1.0h.

[0036] 3. High-temperature anaerobic digestion...

Embodiment 3

[0039] 1. Sludge preparation: The raw sludge (taken from the sludge dehydration room of the sewage treatment station of Shandong New Times Pharmaceutical Co., Ltd., with a solid content of 23%, a pH of 7.0, and organic components in the solids accounting for 56%) and the remaining sludge (The sludge concentration tank of the sewage treatment station of Shandong New Times Pharmaceutical Co., Ltd. has a solid content of 2%, a pH of 6.9, and organic components in the solid account for 61%). Mixed sludge (9% solid content, 6.9 pH, 57% organic components in solids) was obtained after stirring and mixing.

[0040] 2. Pretreatment: The mixed sludge first passes through the ultrasonic treatment device, the ultrasonic treatment frequency is 28kHz, and the treatment time is 30 minutes; then it enters the heat treatment device, the heat treatment temperature is 60°C, and the treatment time is 2 hours.

[0041] 3. High-temperature anaerobic digestion: The pretreated sludge enters the high...

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