JPS5987100A - Drying method for water-contg. matter - Google Patents

Abstract

PURPOSE:To curtail the amount of energy consumed, while reducing an area for installation in a drying step, by circulating air containing a malodorous component being sucked from a malodorous source to a packed part by a blower to dry water-contg. matter, and introducing outflow air to a deodrizing step. CONSTITUTION:Air 3 containing a malodorous component being sucked from a malodorous source 1 by a blower 2 is circulated through a duct 4 into a drying step 6 equipped with a part 6' packed with granular dehydrated sludge cake 5. The water part of said dehydrated cake 5 is evaporated by bringing said dehydrated cake 5 into direct contact with the air 3 containing a malodorous component, and outflow air 7 containing the evaporated water and the malodorous component is supplied to a deodorizing step 8. During the stay of the dehydrated cake 5 in the drying step 6 for a predetermined time, the dehydrated cake 5 is affected by drying treatment with the large volume of the air 3 containing the malodorous component, and the resulting dried matter 9 is withdrawn. The supply and withdrawal of the dehydrated cake 5 to and from the drying step 6 may be continuously performed.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for drying water-containing materials such as sludge dewatering cake generated from organic wastewater treatment processes such as sewage treatment plants and human waste treatment plants.

Conventionally, since the sludge dewatered cake still has a high water content, it has been common to carry out a subsequent drying process for the dehydrated cake.

However, the conventional method of drying a dehydrated cake requires a large amount of energy such as heavy oil, which is currently a serious problem from the standpoint of energy conservation. Furthermore, although a solar drying method is known, it requires a large installation area and the work of spreading and scraping off the dehydrated cake is troublesome, so it is hardly ever actually used.

The present invention is based on an idea completely different from such conventional drying methods, and provides a new drying method that completely satisfies both the requirements of reducing the installation area of the drying process and significantly reducing energy consumption. The purpose is to

That is, most organic wastewater treatment facilities have areas where bad odors occur, so it has recently become extremely common to install deodorization equipment.

For example, [In a urine processing facility, bad odors are generated from the L7 urine input, storage tank, dehydrator room, etc., so the ducts are used to suck out the bad smell gas from these points where the bad odor is generated, and then the deodorizing equipment is sent to the deodorizing equipment. sending.

The present invention was completed based on an idea that had never existed before: could the flow of air containing many malodorous components generated by the suction fan of this malodorous gas be used for aeration drying of the sludge dewatering cake? A drying step having a water-containing material block 1 and a decomposition section is interposed between the malodor source and the deodorizing step, and the blower is filled with malodorous component-containing air sucked from the malodor source by L-). This is a method for drying a water-containing material, which is characterized in that the water-containing material is dried and decontaminated by ventilation through the drying process, and the outflow air that has passed through the drying process is guided to the deodorizing process.

Next, one embodiment of the present invention will be explained while referring to the drawings.
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FIG. 1 V shows a conventional deodorization process, and the air flow generated by the fan 22 is used only to supply air 23 containing malodorous components to the deodorization device 28. is clear. 21 is a source of bad odor, 33&J is deodorized air.

FIG. 2 shows the implementation stage 11- of the present invention, in which a bad odor is generated.
The air 3 containing malodorous components is sucked from the air blower 2 (fan, blower) e through the duct 4:I+1, and then flows into the drying process 6 equipped with a filling part 6' for the granular sludge dewatered cake 5. be ventilated. Moisture in the dehydrated cake 5 is evaporated by internal contact with the malodorous component-containing air 3, and the outflow air 7 containing both the evaporated moisture and the malodor jj'L'y is passed through the subsequent deodorizing process 33 (preferably an absorption tower). ).

(After 7, the dehydrated cake 5 is dried in step 6!
! While I was staying at 7j11 for a fixed period of time, the stench of Daifudan was formed/))
Dry by containing air 3 1: ' A treatment is applied to dried material 9
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The diameter of the full JJQ portion 6' is 71. It is preferable to set the diameter of the duct 4 to be larger than the diameter of the duct 4, and to make the superficial velocity of the air smaller than the flow velocity in the duct, since this can reduce the pressure 11 and reduce the amount of duct scattering. Layer thickness t,
If this is increased by 1, the pressure drop will be large.) Air blower 2
Although the power increases, a length of about 1 to 3 m is efficient and preferable.

Furthermore, the supply of the dehydrated cake 5 to the drying process 6 and the output of 4Jl may be continuous, but it is preferable to use a seal to prevent leakage. ” 2 is much more suitable for immediate batch processing.
It is preferable to send the malodorous component-containing air 3 to the bypass duct 1o by switching the valve &C while removing the object 9.

For example, a plurality of 1 part 6' units should be installed in parallel, and the ventilation of non-nitrogen gas containing malodorous components should be alternately switched.

This is very convenient.

Furthermore, it is preferable to install a heat exchanger l in the duct 4 and preheat the ventilation air to the filling part 6' with a high-temperature fluid 12 such as high-temperature gas, steam, or a heat medium because the steering time can be shortened. In order to obtain the high-temperature fluid 2, it is preferable to self-combust the dry material 9 and recover the generated heat. Second
13 in the figure is deodorized air.

According to the present invention, the following industrially significant effects can be obtained.

0) The air flow generated by the blower of foul-smelling air, which has never been effectively used for purposes other than deodorization, can now be used for the evaporation of water from water-containing materials such as sludge dewatering cake, so it is virtually There is an extraordinary energy saving effect in that the energy required for drying famous water products is either not necessary or significantly reduced.

■ Malodorous components that volatilize from water-containing materials during the drying process.
Since the dust is removed in the subsequent deodorizing process, it has the necessary effect, so unlike the conventional drying method, a special deodorizing process is not required, resulting in significant equipment costs and maintenance. It has a cost saving effect.

■ [2] If the conventional drying method is used, a large amount of air 3 containing malodorous components and t are separately dried (i) Exhaust gas is generated, but in the present invention, the air 3 containing malodorous components itself is used for drying. Therefore, there is an inter-mold effect in that dry exhaust gas is not generated separately, and as a result, equipment costs and maintenance costs for the deodorizing process 8 hardly increase.

This effect is an important effect that cannot be achieved with conventional drying methods.

[Brief explanation of the drawing]

Figure 1 is a flow sheet showing the conventional deodorizing process, Figure 2
J, is a flow sheet showing one embodiment of the present invention. 1...to? , odor source, 2... feeding machine, 3... malodorous component-containing air, 4... duct, 5... dehydrated cake, 6... drying process, 6'... filling section, 7... Outflow sudden air, 8... Deodorizing process, 9... Dry material, 10... Bypass duct, 11... Section exchanger, 12... High temperature fluid, ] 3... Deodorizing air.

Claims (1)

[Claims] 1. A drying process having a water-containing material filling part is interposed between the malodor source and the deodorizing process, and the malodorous component-containing air sucked from the malodor source by a blower is transferred to the filling part. A method for drying a water-containing material, characterized in that the water-containing material is dried by aerating the water-containing material, and the outflow air from the drying step is guided to the deodorizing step. 2. Claim 1, wherein the drying step is configured by providing a plurality of the filling sections in parallel, and the aeration treatment of the malodorous component-containing air can be switched between the filling sections. Method described. 5. The method according to claim 1 or 2, wherein preheated malodorous component-containing air is used for the ventilation treatment.