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Sewage heat pretreatment wall breaking device and sewage treatment method

A technology for sludge treatment and sludge, which is applied in the field of sludge thermal pretreatment wall-breaking device, which can solve the problem of increasing the amount of water and bound water inside the sludge floc particles, increasing the energy cost of sludge drying and dehydration, and high resistance to filtration and dehydration and other problems, to achieve the effect of stable work, strong practicability, and good flocculation and concentration

Active Publication Date: 2016-01-06
江苏国翔环保科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, since most of the organic matter in the sludge is the cell matter of microorganisms, it is wrapped by the cell wall and the cell wall. In addition, while polyacrylamide and the hydrophilic substances in the sludge form a composite colloidal network structure, the long chain of polyacrylamide also A large amount of water is also wrapped up, resulting in an increase in the amount of water and bound water inside the sludge floc particles, which has a large resistance to later filtration and dehydration. After dehydration by mechanical devices such as filter press and centrifugation, the water content of the sludge remains As high as 70-80wt%, which results in the high temperature required for the sludge drying step, which takes a long time and increases the energy cost of sludge drying and dehydration

Method used

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  • Sewage heat pretreatment wall breaking device and sewage treatment method
  • Sewage heat pretreatment wall breaking device and sewage treatment method
  • Sewage heat pretreatment wall breaking device and sewage treatment method

Examples

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example 1

[0063] A method for sludge treatment using a wall-breaking device as described, comprising the steps of:

[0064] Step 1: Filter the sludge that has been flocculated and concentrated by polyacrylamide using a filter screen with a pore size of 10mm, wherein the water content of the concentrated sludge is 80wt%, and the amount of polyacrylamide added is 0.2wt %, the polyacrylamide is a cationic polyacrylamide, the cationic degree of the cationic polyacrylamide is 45%, and the number average molecular weight of the polyacrylamide is 5.5 million;

[0065] Step 2: The sludge obtained in Step 1 is thermally pretreated at 80° C. for 40 minutes using the wall-breaking device, wherein the energy for the heat treatment comes from the steam generating device;

[0066] Step 3: Mechanically dewatering the sludge obtained in Step 2 until the water content reaches 45 wt%;

[0067] Step 4: Dry the sludge obtained in Step 3 to a water content of 10wt% through a sludge dryer.

example 2

[0069] A method for sludge treatment using a wall-breaking device as described, comprising the steps of:

[0070] Step 1: Filter the sludge flocculated and concentrated by polyacrylamide using a filter screen with a pore size of 18mm, wherein the water content of the concentrated sludge is 90wt%, and the amount of polyacrylamide added is 0.35wt %, the polyacrylamide is a cationic polyacrylamide, the cationic degree of the cationic polyacrylamide is 50%, and the number average molecular weight of the polyacrylamide is 8 million;

[0071] Step 2: The sludge obtained in Step 1 is thermally pretreated at 100° C. for 60 minutes using the wall-breaking device, wherein the energy for heat treatment comes from waste heat of exhaust gas;

[0072] Step 3: mechanically dehydrating the sludge obtained in Step 2 until the water content reaches 42wt%;

[0073] Step 4: Dry the sludge obtained in Step 3 to a water content of 8 wt% through a sludge dryer.

example 3

[0075] A method for sludge treatment using a wall-breaking device as described, comprising the steps of:

[0076] Step 1: Filter the sludge flocculated and concentrated by polyacrylamide using a filter screen with a pore size of 15mm, wherein the water content of the concentrated sludge is 85wt%, and the amount of polyacrylamide added is 0.28wt %, the polyacrylamide is a cationic polyacrylamide, the cationic degree of the cationic polyacrylamide is 47%, and the number average molecular weight of the polyacrylamide is 7 million;

[0077] Step 2: The sludge obtained in Step 1 is thermally pretreated at 90° C. for 50 minutes using the wall-breaking device, wherein the energy for the thermal treatment comes from oilfield associated gas;

[0078] Step 3: Mechanically dewatering the sludge obtained in Step 2 until the water content reaches 40wt%;

[0079] Step 4: Dry the sludge obtained in Step 3 to a water content of 15 wt% through a sludge dryer.

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Abstract

The invention discloses a sewage heat pretreatment wall breaking device which is provided with the following parts sequentially in the flowing direction of sewage: a feeding unit, a wall breaking unit, a discharging unit and a support, wherein the feeding unit is provided with a feeding port; the wall breaking unit is connected to the feeding unit, and includes a casing with a heating medium inlet and a heating medium outlet, and a wall breaking pipeline built in the casing; the discharging unit is connected to the wall breaking unit, and is provided with a discharging port; the support supports the bottom of the wall breaking unit; connecting plates are fixedly connected between the feeding unit and the wall breaking unit, as well as between the wall breaking unit and the discharging unit respectively; through holes are formed in the connecting plates; the wall breaking pipeline extends and is fixed to the through holes. The invention further discloses a method for sewage treatment through adopting the wall breaking device, and cell walls of sewage microorganisms and associative keys of matters outside the microbial cells and water can be effectively damaged, follow-up mechanical dehydration efficiency of sewage is increased, and energy consumption in the final drying step of sewage is greatly reduced.

Description

technical field [0001] The invention relates to the field of sludge treatment, in particular to a thermal pretreatment wall breaking device for sludge and a sludge treatment method. Background technique [0002] In sewage treatment projects, various coagulants or coagulants are generally added to destabilize suspended particles in sewage, and colloidal particles coagulate with each other to form flocs. As the volume of flocs further increases, Under the action of gravity, it separates from the water phase and precipitates to form a large amount of sludge. Among them, polyacrylamide has been widely used due to its easy-to-obtain raw materials, excellent adsorption bridging effect and electrical neutralization effect, and good sludge particle flocculation effect. [0003] The most important step in sludge treatment is to separate the water in the sludge and reduce the volume of the sludge, thereby reducing the sludge volume load in the subsequent treatment process. However, ...

Claims

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Application Information

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IPC IPC(8): C02F11/18C02F11/12C02F11/14
Inventor 马雪明朱家俭
Owner 江苏国翔环保科技有限公司
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