Sludge-dewatering set, and sludge-dewatering device having a plurality of layers

A sludge dehydration set comprising:

• a structure provided in a form of a steel mesh net, or a matrix, having a plurality of holes, and positioned under a filtration belt to support the filtration belt such that the filtration belt is not bent or sagged while moving dehydrated water down;
• a water collecting part installed under the structure provided in the form of the steel mesh, the mesh net, and the matrix and having the holes to collect the dehydrated water;
• an air or liquid injection part installed under the water collecting part to receive liquid or air injected into the air or liquid injection part such that pressure is applied to sludge;
• a membrane provided at a lower end of the air or liquid injection part, having elasticity, and having a sealing structure to prevent the liquid, the air, and the sludge from passing through the membrane such that pressure of the liquid or the air injected into the air or liquid injection part is applied to the sludge;
• a sludge introduction part installed under the membrane to receive the sludge to be dehydrated;
• and
• a filtration belt installed under the sludge introduction part and tightened by rollers installed at lower edges of both sides of a chamber to dehydrate the sludge introduced into the sludge introduction part using the pressure applied by the air or liquid injection part.

A sludge dehydration apparatus having multiple layers, the sludge dehydration apparatus comprising a sludge dehydration set comprising:

• a structure provided in a form of a steel mesh net, or a matrix, having a plurality of holes, and positioned under a filtration belt to support the filtration belt such that the filtration belt is not bent or sagged while moving dehydrated water down;
• a water collecting part installed under the structure provided in the form of the steel mesh, the mesh net, and the matrix and having the holes to collect the dehydrated water;
• an air or liquid injection part installed under the water collecting part to receive liquid or air injected into the air or liquid injection part such that pressure is applied to sludge;
• a membrane provided at a lower end of the air or liquid injection part, having elasticity, and having a sealing structure to prevent the liquid, the air, and the sludge from passing through the membrane such that pressure of the liquid or the air injected into the air or liquid injection part is applied to the sludge;
• a sludge introduction part installed under the membrane to receive the sludge to be dehydrated;
• and
• a filtration belt installed under the sludge introduction part and tightened by rollers installed at lower edges of both sides of a chamber to dehydrate the sludge introduced into the sludge introduction part using the pressure applied by the air or liquid injection part,
• wherein sludge dehydration sets are constructed at the multiple layers.