JPH09168799A - Onboard type sludge treatment apparatus utilizing flocculant and vibrating screen - Google Patents

Abstract

PROBLEM TO BE SOLVED: To utilize a vibrating screen system high in treatment capacity in a dehydration process to enhance treatment capacity by charging a flocculant in a raw soln. in a pretreatment stage to granulate the solid in the raw soln. SOLUTION: At first, the sludge of a raw soln. tank pumped up by a pump to be supplied to a pretreatment tank 1 and a flocculant is charged in the tank and the sludge is stirred and flocculated by the air generated by an air compressor. A liquid is drained through a trommel 2 by opening the valve provided to the lower part of the tank to be charged in a vibrating screen 3. The solid in the liquid is granulated by the vibration of the vibration screen 3 and moisture falls to a lower water receiving tank. The granulated solid is charged on a screw conveyor 4 and kneaded with a solid agent to become recycle soil. The overflow water of the water receiving tank is supplied to a ceramic filter 5 by a pump 5 to be filtered to become fresh water.

Description

Detailed Description of the Invention

[0001]

TECHNICAL FIELD The present invention relates to sludge treatment for dehydrating and purifying sludge from urban rivers and ponds and sludge-like industrial waste from various industries into recyclable residual soil and fresh water.

[0002]

2. Description of the Related Art A conventional sludge treatment apparatus uses a centrifugal force of a centrifugal separator for a stock solution for its water separation process. This has an advantage of separating particles having a small particle size, but requires high speed rotation. However, it had a drawback that the device was large and expensive. On the other hand, the vibrating screen has a large processing capacity and is inexpensive, and was used for crushed stones and other particles with a large particle size, but it was not suitable for separating particles with a small particle size such as sludge.

[0003]

According to the conventional method, the water content in the sludge treatment process is separated by a centrifugal separation method. However, the accuracy of the separation increases, but the apparatus requires high-speed and high-precision rotation. Since it itself is large and expensive, and the power required for operation also becomes large, it was not possible to have sufficient sludge treatment capacity in a size that could be mounted on a vehicle.

[0004]

[Means for Solving the Problems] The water separation process is divided into three stages. First, in a pretreatment step, a coagulant (a chemical that granulates the solid content in the liquid) is injected into the stock solution to form a sludge. Granulate the solid content inside. Next, the undiluted solution is passed through a low-speed rotating trommel (mesh cylinder is attached diagonally), and only the solution of the particle size that has passed through the solution is passed through a vibrating screen to drain water. With this method, a large amount of dehydration treatment can be performed with low power as compared with the conventional method. Further, the dehydrated soil was made to react with the solidifying agent to be recycled soil, and the separated water was passed through a ceramic filter to be purified water.

[0005]

BEST MODE FOR CARRYING OUT THE INVENTION In the pretreatment stage, a flocculant is added to the stock solution to granulate the solid content in the solution so that a vibrating screen type with high processing capacity can be used in the dehydration process to improve the processing capacity. be able to.

[0006]

[Examples]

FIG. 1 illustrates a basic embodiment. First, the sludge in the stock solution tank is pumped up to the pretreatment tank 1, the coagulant is introduced into the tank, and the air generated by the air compressor is used to stir and coagulate. The liquid is drained through the trommel at 2 by opening the valve at the bottom of the tank and charged into the vibrating screen at 3. Due to the vibration of the vibrating screen, the solid content of the liquid is granulated and the water drops into the lower water receiving tank. The granulated solid content is dropped on the screw conveyor 4 and kneaded with the solid agent to be recycled soil. As for water, the overflow water in the water receiving tank is purified by a pump with a ceramic filter 5 to become clear water.

[0007]

EFFECTS OF THE INVENTION At present, when treating sludge from rivers,
At present, the processing was carried to a stationary treatment plant in a municipality with a dedicated transport vehicle, but with the invention of this device, it is possible to treat at the sludge generation area. Further, even in a stationary sludge treatment plant, by adopting the dehydration treatment method of the present invention, a high treatment capacity can be obtained at low cost.

[Brief description of the drawings]

FIG. 1 is an explanatory diagram of a process of the present invention.

FIG. 2 is an elevational view of the present invention.

[Explanation of symbols]

 1 Pretreatment tank, 2 Trommel 3 Vibrating sieve 4 Screw conveyor 5 Ceramic filter

Claims (1)

[Claims] 1. A vehicle-mounted sludge treatment device in which a coagulant is charged and water is separated by a trommel and a vibrating screen.