Method and system for decrement treatment of biochemical sludge

A biochemical sludge and treatment method technology, which is applied in sludge treatment, water/sludge/sewage treatment, sludge treatment through temperature control, etc., can solve the problem of not getting better sludge treatment effect, heat and mass transfer effect There is a large difference in sludge properties, etc., to achieve the effect of high VSS removal rate, low treatment cost and high sludge reduction rate

Pending Publication Date: 2020-05-22
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, this has caused the problems of large sludge treatment volume and high cost, and the properties of different sludges are very different. Even the fluidity and heat and mass transfer effects of different sludges with the same concentration are also very different. Can not get better sludge treatment effect

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0091] (1) introducing biochemical excess sludge into a concentrated sludge dewatering machine for concentration and dehydration treatment to obtain concentrated and dehydrated biochemical excess sludge with a water content of 83% by weight (f is 73%);

[0092] (2) Introduce the concentrated and dehydrated biochemical residual sludge into the sludge pretreatment tank and contact with 30% by weight aqueous sodium hydroxide solution at 45°C for preheating treatment for 60 minutes, while hydrolyzing the sludge by circulating heat The supernatant in the dehydrator (i.e. the separated water below) reduces the viscosity, the reflux rate of the supernatant in the thermally hydrolyzed sludge dewaterer is 0.55 tons / ton of mud, and the viscosity of the material in the sludge pretreatment tank is 970cp, and the obtained material I;

[0093] (3) introducing the material I into a thermal hydrolysis reactor to carry out a thermal hydrolysis reaction with steam at 140° C. for 240 minutes, wh...

Embodiment 2

[0098] (1) introducing biochemical excess sludge into a concentrated sludge dewatering machine for concentration and dehydration treatment to obtain concentrated and dehydrated biochemical excess sludge with a water content of 85% by weight (f is 71%);

[0099](2) Introduce the concentrated and dehydrated biochemical residual sludge into the sludge pretreatment tank and contact with 30% by weight sodium hydroxide aqueous solution at 42°C to perform preheating treatment for 80 minutes, while hydrolyzing the sludge by circulating heat The supernatant in the dehydrator (i.e. the separated water below) reduces the viscosity, the reflux rate of the supernatant in the thermal hydrolysis sludge dewaterer is 0.41 tons / ton of mud, and the viscosity of the material in the sludge pretreatment tank is 980cp, and the obtained material I;

[0100] (3) introducing the material I into a thermal hydrolysis reactor to carry out a thermal hydrolysis reaction with steam at 200° C. for 120 minutes...

Embodiment 3

[0105] (1) introducing biochemical excess sludge into a concentrated sludge dewatering machine for concentration and dehydration treatment to obtain concentrated and dehydrated biochemical excess sludge with a water content of 87% by weight (f is 72%);

[0106] (2) Introduce the concentrated and dehydrated biochemical residual sludge into the sludge pretreatment tank and contact with 30% by weight sodium hydroxide aqueous solution at 40°C to perform preheating treatment for 120min, while hydrolyzing the sludge by circulating heat The supernatant in the dehydrator (i.e. the separated water below) reduces the viscosity, the reflux rate of the supernatant in the thermal hydrolysis sludge dewaterer is 0.37 tons / ton of mud, and the viscosity of the material in the sludge pretreatment tank is 960cp, and the obtained material I;

[0107] (3) introducing the material I into a thermal hydrolysis reactor to carry out a thermal hydrolysis reaction with steam at 180° C. for 60 minutes, wh...

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Abstract

The invention relates to the field of sludge treatment, and discloses a method and a system for decrement treatment of biochemical sludge. The method comprises: (1) pre-heating concentrated and dehydrated biochemical residual sludge to obtain a material I; (2) carrying out a pyrohydrolysis reaction on the material I and steam to obtain a material II; (3) carrying out flash evaporation treatment onthe material II to obtain a material III; and (4) carrying out dehydration treatment on the material III to respectively obtain separated water and dehydrated sludge, and circulating part of the separated water back to the step (1) to participate in preheating treatment. The method provided by the invention can greatly reduce the volume of biochemical residual sludge, and has the advantages of good treatment effect (high VSS removal rate and high sludge reduction rate).

Description

technical field [0001] The invention relates to the field of sludge treatment, in particular to a biochemical sludge reduction treatment method and a biochemical sludge reduction treatment system. Background technique [0002] Biochemical residual sludge is an extremely complex heterogeneous body composed of organic debris, microorganisms, inorganic particles, etc. It is highly polluting to the environment, and has complex components and difficult treatment. It has become a hot spot of concern. [0003] In recent years, my country's environmental protection industry has developed rapidly, and the sewage treatment capacity and treatment efficiency have increased rapidly. The construction of a large number of sewage treatment plants has undoubtedly played a significant role in protecting the water environment, but a large amount of biochemical excess sludge has been produced. For this part of biochemical sludge, sewage treatment plants usually adopt the method of "mechanical d...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F11/121C02F11/10C02F11/13C02F11/18
CPCC02F11/10C02F11/121C02F11/18C02F2303/06C02F11/13
Inventor 桑军强高峰赵锐秦冰曹晓磊杨宇宁马欣杨春鹏
Owner CHINA PETROLEUM & CHEM CORP
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