Efficient sludge dewatering method based on ball milling

Abstract

The invention relates to an efficient sludge dewatering method based on ball milling. The method comprises the following steps: (1) preparing a ball mill and sludge with the water content of 80%; (2) putting the sludge with the water content of 80% into the ball mill; (3) opening the ball mill, and enabling the sludge with the water content of 80% to rotate in the ball mill; (4) when the ball mill rotates, a large number of steel balls in the ball mill are thrown and hit out of order to collide with each other and are in full contact with the sludge with the water content of 80% at the same time, so that polyacrylamide plastic molecular chains in the sludge with the water content of 80% are broken, and polyacrylamide cells are split and broken to release water molecules; (5) pumping water molecules to a dehydrator for dehydration through a slurry pump of the ball mill; and (6) obtaining the modified sludge with the water content of less than 50%. According to the method, the dehydration rate of the sludge can be improved, and the sludge cake with the water content of 50% or below is obtained and can be better recycled.

Description

Technical Field

[0001] The invention relates to the technical field of sludge, and in particular to a high-efficiency sludge dewatering method. Background Art

[0002] At present, with the development of urbanization, more and more sludge is generated. In order to build an environmentally friendly society, sludge will be collected and reused. Sludge often exists in the form of a mixture of mud and water. In order to better store and utilize it, the sludge is dehydrated and reused. In the prior art, the sludge is often dehydrated by adding a modifying agent. For example, an alkaline agent is used to break the wall of the PAM cells in the sludge and dehydrate them. This method requires the addition of a large amount of quicklime, which is essentially an incremental treatment. For example, lime is used for proportioning, and ferric chloride, ferric chloride, polyferric, polyaluminum or acid agents are added. This method easily causes the dehydrated sludge and the removed water to contain heavy metal mercury, chloride ions or corrosive acids and other substances that pollute the environment, increasing the secondary uncontrollable risk, resulting in the problem that the water treatment process removed from the sludge is complicated, the treatment cost is high, and the mud cake is difficult to reuse.

[0003] Therefore, those skilled in the art believe that it is necessary to develop an efficient sludge dewatering method to solve the problem that organic sludge cannot quickly and effectively form solidified blocks. Summary of the invention

[0004] In view of the above technical problems existing in the prior art, the present invention provides a high-efficiency sludge dewatering method, which has good sludge dewatering effect and strong practicability.

[0005] To achieve the above object, the present invention provides the following technical solutions:

[0006] A high-efficiency sludge dehydration method based on ball milling, comprising the following steps: (1) preparing a ball mill and sludge with a water content of 80%; (2) placing the sludge with a water content of 80% in the ball mill; (3) turning on the ball mill to rotate the sludge with a water content of 80% in the ball mill; (4) when the ball mill rotates, a large number of steel balls in the ball mill are thrown and collided with each other in a random order, and fully contact the sludge with a water content of 80%, so that the polyacrylamide plastic molecular chains in the sludge with a water content of 80% are broken and the polyacrylamide cells are split and broken to release water molecules; (5) the water molecules are extracted by the mud pump of the ball mill to a dehydrator for dehydration; (6) modified sludge with a water content of less than 50% is obtained.

[0007] As a further elaboration of the above technical solution:

[0008] In the above technical solution, in step (4), the polyacrylamide plastic molecular chains in the sludge with a water content of 80% are broken and the polyacrylamide cells are split and broken to release water, and there is no need to add water for dilution. While meeting the original fluidity of the sludge with a water content of 80%, it can also be directly pumped into the dehydrator for dehydration through a mud pump.

[0009] In the above technical solution, in step (4), a large number of steel balls in the ball mill collide repeatedly to generate a large number of ions, so that the sludge is micro-electrolyzed and reduced and reorganized into particles. A heat source is generated during the electrolysis process to promote the electrolysis reaction, effectively remove odors such as ammonia nitrogen, and release a large amount of iron elements that are beneficial to the human environment. After the sludge is reorganized, the iron element can increase the density of the sludge and separate water molecules from organic matter. When the polyacrylamide molecules are heated, they shrink and reorganize to obtain larger particles, which is beneficial to the dehydration bridging effect, so that water molecules are quickly transferred from the gaps between the bridging particles to the surface.

[0010] Beneficial effects of the present invention:

[0011] The present invention is based on the fact that a large number of steel balls in a ball mill are thrown and hit in a random order and collide with each other, so that they fully contact with the sludge with a water content of 80%, so that the polyacrylamide plastic molecular chain in the sludge with a water content of 80% is broken and the polyacrylamide cells are split and broken to release water molecules for dehydration, so as to obtain the modified sludge with a water content of less than 50%. The present invention directly modifies the sludge with a water content of 80% without adding any modifier; the sludge with a water content of 80% undergoes a micro-electrolysis reaction under the repeated throwing and hitting of the steel balls, and the water molecules are released during the micro-electrolysis reaction, while ensuring the high fluidity of the sludge, no water needs to be added for dilution, water is saved and a large amount of secondary water treatment is generated. During the micro-electrolysis reaction, the collision of the steel balls can release a large amount of iron ions and heat sources, which accelerates the modification speed of the sludge, effectively removes odors such as ammonia nitrogen odor, and can be directly discharged up to the standard, so that the working environment is comfortable, no secondary pollution to the environment occurs, the dewatered water is simple to handle, and the mud cake is easier to reuse. DETAILED DESCRIPTION

[0012] The present invention is described in detail below with reference to specific embodiments.

[0013] The present embodiment provides a high-efficiency sludge dewatering method based on ball milling, which comprises the following steps: (1) preparing a ball mill and sludge with a water content of 80%; (2) placing the sludge with a water content of 80% in the ball mill; (3) turning on the ball mill to rotate the sludge with a water content of 80% in the ball mill; (4) when the ball mill rotates, a large number of steel balls in the ball mill are thrown and collided with each other in a random order, and fully contact with the sludge with a water content of 80%, so that the polyacrylamide plastic molecular chains in the sludge with a water content of 80% are broken and the polyacrylamide cells are split and broken to release water molecules; (5) the water molecules are extracted by the mud pump of the ball mill to the dehydrator for dehydration; (6) the modified sludge with a water content of less than 50% is obtained.

[0014] As a further elaboration of the above technical solution:

[0015] In the above technical solution, in step (4), the polyacrylamide plastic molecular chains in the sludge with a water content of 80% are broken and the polyacrylamide cells are split and broken to release water, and there is no need to add water for dilution. While meeting the original fluidity of the sludge with a water content of 80%, it can also be directly pumped into the dehydrator for dehydration through a mud pump.

[0016] In the above technical solution, in step (4), a large number of steel balls in the ball mill collide repeatedly to generate a large number of ions, so that the sludge is micro-electrolyzed and reduced and reorganized into particles. A heat source is generated during the electrolysis process to promote the electrolysis reaction, effectively remove odors such as ammonia nitrogen, and release a large amount of iron elements that are beneficial to the human environment. After the sludge is reorganized, the iron element can increase the density of the sludge and separate water molecules from organic matter. When the polyacrylamide molecules are heated, they shrink and reorganize to obtain larger particles, which is beneficial to the dehydration bridging effect, so that water molecules are quickly transferred from the gaps between the bridging particles to the surface.

[0017] In the description of the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", and "fixed" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0018] The standard parts used in the present invention can all be purchased from the market, and special-shaped parts can all be customized according to the instructions. The specific connection methods of each part adopt conventional means such as mature bolts, rivets, welding, etc. in the prior art. Machinery, parts and equipment all adopt conventional models in the prior art, and circuit connections adopt conventional connection methods in the prior art, which will not be described in detail here.

[0019] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

[0020] Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of the present invention, rather than to limit the scope of protection of the present invention. Although the present invention has been described in detail with reference to the preferred embodiments, those skilled in the art should understand that the technical solution of the present invention can be modified or replaced by equivalents without departing from the essence and scope of the technical solution of the present invention.

Claims

1. A method for efficient sludge dewatering based on ball milling, characterized in that: It includes the following steps: (1) preparing a ball mill and sludge with a moisture content of 80%; (2) placing the sludge with a moisture content of 80% in the ball mill; (3) Turn on the ball mill and allow the sludge with a moisture content of 80% to rotate in the ball mill; (4) When the ball mill rotates, a large number of steel balls in the ball mill are thrown and collided with each other in a random order, and are fully in contact with the sludge with a moisture content of 80%, so that the polyacrylamide plastic molecular chains in the sludge with a moisture content of 80% are broken and the polyacrylamide cells are split and broken to release water molecules; (5) The water molecules are extracted by the mud pump of the ball mill to the dehydrator for dehydration; (6) Modified sludge with a moisture content of less than 50% is obtained.

2. The efficient sludge dewatering method according to claim 1, characterized in that: In step (4), the polyacrylamide plastic molecular chains in the sludge with a moisture content of 80% are broken and the polyacrylamide cells are split and broken to release water, and there is no need to add water for dilution. While meeting the original fluidity of the sludge with a moisture content of 80%, it can also be directly pumped into the dehydrator for dehydration through a mud pump.

3. The efficient sludge dewatering method according to claim 1, characterized in that: In step (4), a large number of steel balls in the ball mill collide repeatedly to generate a large number of ions, so that the sludge is micro-electrolyzed and reduced and reorganized into particles. A heat source is generated during the electrolysis process to promote the electrolysis reaction, effectively remove odors such as ammonia nitrogen, and release a large amount of iron elements that are beneficial to the human environment. After the sludge is reorganized, the iron element can increase the density of the sludge and separate water molecules from organic matter. When the polyacrylamide molecules are heated, they shrink and reorganize to obtain larger particles, which is beneficial to the dehydration bridging effect, so that water molecules are quickly transferred from the gaps between the bridging particles to the surface.