JPH02298399A - Sludge dehydration conveyance equipment - Google Patents

Abstract

PURPOSE:To reduce friction resistance by forcibly holding compressed and dehydrated excretion residue by a solidifying agent even when the properties of said excretion residue are not constant to feed the same in a solidified state by providing a nozzle injecting a solidifying agent solution for solidifying excretion residue after compression and dehydration to a dehydrating molding part and making the diameter of a feed part larger than that of the dehydrating molding part. CONSTITUTION:The excretion residue compressed in a press compression part A is successively sent in a dehydrating molding part B. Since this dehydrating molding part B is reduced in its diameter, the excretion residue is forcibly sent to said molding part B in the state compressed in the press compression part A or in a further compressed state to be dehydrated and molded herein. A plurality of nozzles 4 are provided in this dehydrating molding part B and a solidifying agent solution is injected toward the excretion residue after dehydrating molding from a solidifying agent solution tank 5 by a pump 6 to solidify the excretion residue. Since the excretion residue is solidified to be prevented from again expanding and diffusing, feed capacity can be reduced and the feed in a cylindrical body can be surely performed.

Description

[Detailed Description of the Invention] [Field of Industrial Application] The present invention is a method for compressing and dewatering the residue scraped up and removed from waterways of sewage treatment plants, pumping stations, etc., and a pipe-shaped conveying cylinder connected to this dewatering part. This water conveyance device is designed to reduce frictional resistance so that water can be conveyed smoothly.

[Conventional technology]

The sludge traditionally collected from sewage treatment plants has a high moisture content,
Feeding the collected waste into a hopper or into an incinerator requires time and effort for subsequent processing. For this reason, it is necessary to dehydrate the collected residue until the moisture content is below a predetermined level. Conventionally, this sludge is dehydrated using a dehydrator, and the sludge after dewatering is transported to a hopper or an incinerator using a transporter.

Furthermore, Japanese Patent Publication No. 46-26285 discloses a method of pressure feeding through a sealed cylinder (duct).

[Problem to be solved by the invention]

The method of dewatering the residue using a dehydrator and then transporting it to a predetermined location using a conveyor requires a large amount of space for installing the equipment, and it is difficult to seal the equipment for maintenance and inspection purposes. Since it is an open type, it causes a deterioration of the working environment such as the scattering of bad odors. In order to improve this problem, a sealed pressure feeding method within a duct has been proposed and put into practical use. However, in this method, the inside of the cylinder is forced to be fed after pressurized dewatering by a piston, so a large resistance is created between the inside of the duct and the residue during all transportation steps other than dehydration, and a strong force is required to transport the residue. This method requires a large pumping force, which increases the size of the device, especially the pumping device, and increases running costs.

In order to solve this problem, we made the cross-section of the residue passing through the dewatering section different from the conveying section, and the cross-sectional area of the conveying section was made slightly wider than that of the dewatering section, so that the passing cross section of the residue and the conveying section were made different. It is conceivable to reduce the frictional resistance generated between the inner walls of the parts.

However, the residue is a mixture of food particles, toilet vapor, hair, fibers, human feces, etc., and its properties are not constant.It is compression molded during dehydration, and even if it can temporarily hold its shape, it may be damaged during transportation. It collapses and the frictional resistance between the inner walls of the conveyor cylinder increases,
Transport may become impossible.

In the present invention, even if the residue is in the shape of press-dehydrated residue and its properties are not constant, it is forcibly held by a fixing agent and transported in that state to reduce frictional resistance. The purpose is to

[Means to solve the problem]

A pressure pressing section, a cylindrical dehydration forming section, and a conveying section are successively installed, and a fixing agent solution for solidifying the residue after pressure dehydration is injected at or immediately before and after this dehydration forming section. A nozzle is provided, and the diameter of the conveying part is larger than the diameter of the pressurized dehydration molding part.

[For production]

The residue is supplied from an input conveyor or the like through a chute to the pressure compression section, where it is compressed and sent to the dehydration molding section, where it is dehydrated to remove moisture, and a fixing agent solution is injected from a nozzle to dewater and mold it. After being formed into the cross-sectional shape of the section, it is sent to a conveying section with a diameter slightly larger than that of the molding section, and is sequentially conveyed by dehydration thrust with a slight gap between the inner wall of the conveying section and the platform, and then the exit. More is discharged.

The position at which the adhesive is introduced is selected depending on the curing speed of the adhesive so that the adhesive is appropriately cured immediately after molding.

〔Example〕

The present invention will be explained below based on the illustrated embodiments.

In the figure, reference numeral 1 denotes an input conveyor, which continuously or intermittently conveys sludge collected from waterways of sewage treatment plants, pumps, etc., and supplies it to a pressure dehydrator. A chute 2 is provided below the line end of the input conveyor 1 to receive the waste and reliably supply it to the pressurized dewatering section.

The chute 2 projects from the pressurized dewatering device 3, and the pressurized dehydrating device 3 is equipped with a pressurizing cylinder (or screw) 3a for squeezing and dewatering the residue supplied from the chute 2. , A cylindrical dehydration molding section B and a conveying section C are provided in series with the pressurizing section A provided in this apparatus.

The dehydration molding section B and the conveying section C have the same cross-sectional shape but different warps.

The residue pressurized in the pressure pressing section A is sequentially sent to the dehydration forming section by this pressing thrust. Since this dehydration molding part B has a small diameter, the residue is compressed in the pressure pressing part A or in a further compressed state.
Since the material is forcibly fed into the container, it is dehydrated and molded here. However, since the residue contains a wide variety of substances such as food waste, toilet paper, hair, fibers, and human excrement, it remains in that state temporarily even after pressurization, but it is larger than the dehydration molding part B. During transportation, the diameter conveying portion C expands again, increasing the frictional resistance with the inner wall of the conveying portion. In order to prevent this, a plurality of nozzles 4 are provided in this dehydration molding part B so as to maintain the shape molded in the dehydration molding part, and a fixing agent solution is supplied from a tank 6 through a pump 6 and a liquid supply pipe 7. The nozzle 4 injects it toward the residue after dehydration and molding to solidify the residue.

As this fixing agent solution, water glass (sodium silicate), carboxymethyl cellulose, polyvinyl alcohol, etc. are used.

In addition, the nozzle for spraying this fixing agent solution may be installed in the chute 2 or at a position immediately after the chute strand is pressurized by a cylinder, or furthermore, in the secondary chute, in the pressurizing section, It is also possible to provide it in all dehydration molding parts.

〔Effect of the invention〕

According to the present invention, in the process of pressurizing and dehydrating the residue collected from a waterway etc. whose properties are not constant, a fixing agent solution is sprayed or Since the injected and compression-molded residue is solidified and prevented from expanding and dissipating again, the frictional resistance with the inner wall of the conveying section, which is lined a little thicker than the dehydrating molding section, does not increase, so the conveying capacity is increased. As well as being reduced,
Transport within the cylinder can be performed reliably.

[Brief explanation of drawings]

111th! 1 is a schematic explanatory view of the whole, FIG. 2 is a cross-sectional view of the conveying section after pressurized dehydration, and FIG. 3 is a cross-sectional view showing the state during pressurization. 1 is the input conveyor, 2 is the chute, 3 is the pressure dewatering device,
4 is a nozzle, 5 is a fixing agent solution tank, 6 is a pump, A is a pressurizing section, B is a dehydration molding section, and C is a conveying section. Patent Applicant Hitachi Kiden Kogyo Co., Ltd. July 3, 1999 December 1999 150 Director General of the Japan Patent Office Yoshi 1) Mr. M. 1, Indication of Case Patent Application No. 1-120111 2, Title of Invention 3. Number of claims: 1 4. Relationship with the amended case Patent applicant: 3-11-1 Shimosakabe, Amagasaki City, Hyogo Prefecture Hitachi Kiden Kogyo Co., Ltd. 5: Agent: Nishihonmachi, Nishi-ku, Osaka City 1-2-8 No. 5 Fuji Building New Building cross-sectional shape is corrected as follows. "The cross-section of conveyance section C may have a different shape, but the cross-sectional area should be such that section 0 is substantially larger than section B." (2) In the drawings, Figure 1 has been corrected as shown in the attached sheet. do.

Claims (1)

[Claims] (1) In a device that dehydrates and conveys the residue collected from sewage channels, etc., a pressurizing section, a dehydrating forming section, and a conveying section are successively installed, and the dehydrating forming section or the vicinity thereof is A nozzle is installed to spray a fixing agent solution to solidify the residue after pressure dehydration.
A residue dehydration conveying device in which the diameter of the conveying part is larger than the diameter of the pressurized dehydration molding part.