JPS6041599A - Movable dehydration truck - Google Patents

Abstract

PURPOSE:To obtain a movalbe dehydration truck for loading all necessary apparatuses for dehydration of sludge such as beltpress type dehydrator permissible to be driven by a driver having common license by constructing specified parts of the dehydrator with aluminium. CONSTITUTION:All apparatuses necessary for dehydation of sludge are loaded on a truck C which is drivable to a driver having common license. The sludge recovered by sewage works is fed to a line mixer 3 by sludge feed pump 1. Catiionic, anionic, or nonionic polymer flocculant in a liquid chemical reservoir 5a, 5b are added before or behind the line mixer with a pump 2a, 2b. The mixt. is quickly stirred in the mixer 3 and supplied thereafter to a pretreating drum 4, stirred slowly in a flocculant mixing section 4a, concentrated in a condensing section 4b, and dehydrated in a dehydrator 6. The material for a pressurizing roll and a frame for supporting the roll consists of aluminum to make the weight lighter.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a mobile dehydration vehicle suitable for dewatering sludge generated in a sewage treatment plant, particularly a large number of dispersed small-scale sewage treatment plants.

Conventionally, sewage treatment in Japan has been centered on large cities, where a large amount of water is processed and a large amount of sludge is generated. Therefore, it is common for each treatment plant to permanently install a sludge dewatering machine to dewater the sludge. However, recently there has been a tendency for sewerage systems to be spread not only to large cities but also to small cities and villages in rural areas. In this small city, the amount of treated water generated is small, and therefore the amount of sludge generated is also small. In general, the amount of sludge generated per day in a small-scale sewage treatment plant that serves about 200 to 1,000 people is (1 to 2 L), and in such a small-scale sewage treatment plant in a small urban area, it takes one week or two. Dewatering once a week is sufficient, and there is no need to install permanent dehydration equipment like in treatment plants in large cities.If dehydration equipment is installed at a small-scale sewage treatment plant, there will be a backup machine for the dehydrator,
It is necessary to always have repair parts, etc., and it is also necessary to have workers permanently stationed or patrolling for operation and maintenance, which increases costs.Also, from an environmental standpoint, the dehydrator part is the part that produces the most foul odors. Since the odor is generated in many places, it is necessary to have equipment to prevent this odor, and it would be an extremely heavy economic burden to equip a small-scale treatment plant with such equipment. Therefore, in areas where such small-scale sewage treatment plants are installed in a dispersed manner, it is economical to treat the sludge generated at each treatment plant by periodically visiting all of the sewage treatment plants using a mobile sludge dehydrator. It is.

Furthermore, as a flocculant to be used in this method, a polymer flocculant, which is rarely used, is suitable, and a belt press type dehydrator is advantageous in terms of dewatering performance - adjustment of the dehydrator depending on the difference in sludge. However, this type of dehydrator requires a large amount of space and requires a lot of effort, so a small test machine with a small throughput can be mounted on the bed of a large truck of 8 tons or more. It is only used,
This belt press type dehydrator has low processing capacity and takes a long processing time even in small-scale processing plants. It is difficult to supply cleaning water, and the shortage is loaded onto a truck, which results in a heavy truck as described above.

In view of this, the present invention has been developed by installing a belt press type dehydrator on a truck that many people can drive with a regular driver's license, and by recycling and reusing the large amount of washing water that is required. This eliminates the above-mentioned drawbacks, and also supplies hydraulic power sources for pumps, dehydrators, etc. using vehicle engines, eliminating the need for external power supply, making it possible to process sludge even in treatment plants without power supply equipment.ftl:11 ``It was made possible by the ability.

The present invention 8A will be explained below based on the O-disaster example shown in the drawing.

In the figure, C is a regular truck that can be driven with a regular driver's license, and the truck is equipped with all the equipment necessary for sludge dewatering. This dewatering device has the construction shown in FIG.

The sludge recovered from the sewage treatment plant is then supplied to a line mixer 3 by a sludge pump 1. At this time, the cation yarn tube molecular flocculant and the anion yarn or nonionic polymer flocculant stored in the chemical tanks 5m and 5b are stored before and after the line mixer B, and the chemical inlets connected to each chemical tank are stored. The sludge is added by pumps 21L and 21), and the addition cap is determined so that the sludge becomes an optimal coagulated floc. After adding the flocculant, it is rapidly stirred in the line mixer 3 and then supplied to the entire pretreatment drum 4.

This pre-treatment drum 4 is a drum-shaped drum made of gold 71ζ with an outer cylinder T-40 to 80 mesh and serves as a concentration tank, and an inner cylinder is a double type coagulation mixing tank. The pretreatment drum is rotated at a slow speed, and slow stirring is performed in the coagulation mixing s4a of this pretreatment drum. This is then concentrated to 5 to 7% in the concentrating section 4b, and then supplied to the next dehydrator 6. In this dehydrator, two endless sheets of cloth 6a and 6b are guided by a plurality of roller groups in a manner that they are aligned with each other and bent many times so that the flock can be dehydrated. The desired dehydration is carried out by being strongly compressed between the cloths. When sludge is supplied from the thickening section of the pre-treatment drum in the wedge-shaped pressurized dewatering section 6o of the two o1s cloths 6a and 6b, this endless belt-like P cloth is driven.
The flocs are dehydrated to ~15%, and the flocs are formed into a plate-like shape that is tightly bonded to each other, and further pressurized dewatering is performed in the next roller pressurizing section 6d. Exhaust heat from the engine of the truck is guided into any one of these roller pressure parts or into the pressure roller 7 (one or more) on the rear side, and the exhaust heat is used to
The cake is heated to 0 to 100°C and dehydrated under pressure using a pressure roller to further remove water. In this way, the cake after dehydration is made of endless belt-like p cloth 6a,
The cake is discharged through the open discharge portion 6e of the cake 6b and thrown into the dehydrated cake hopper 8, where it is temporarily stored. In addition, the p-cloths 6a, 5b of the dehydrator are cleaned by a cleaning device 9a attached to the dehydrator.
, 9b, but the wash water and distance water after washing are collected and received in a hopper 90, and are returned to the pre-treatment drum through the circulation pump IOK and sent to the wash water regeneration section 40 of the drum. After the SS concentration is adjusted to 200 mt/N or less, this water is stored in the wash water tank 11. This cleaning water tank 11
The cleaning water is supplied to the cleaning devices 9a and 9b by the cleaning pump 12.
However, the increased amount due to separated water and added IJ flocculant due to sludge dehydration is returned to the treatment plant through the wash water tank 11 through Geo-Baflow. In this case, since the ss concentration is cleaned to below 200 my/β, the functionality of the treatment plant will not be impaired.

Further, the flocculant used in the dehydration apparatus of the present invention is dissolved to a predetermined concentration in the chemical solution plant using the sound of water supplied from the treatment plant.

Upper layer O dehydration equipment All equipment is entirely enclosed in a casing (
This equipment is covered with a cover (made of aluminum, etc.) or a hood to prevent the bad odor generated during sludge dehydration from escaping outside the dehydration vehicle, and depending on the type of engine of the truck, the air supply to the engine is It is also possible to use internal air to supply it to the engine and burn it to deodorize it. Figures 2 and 6 are illustrations of one embodiment of the present invention, in which a belt press with an effective belt width of 1 m is loaded, and the processing capacity is 5,
//h, considering the heat conduction, light weight, and corrosion resistance of the heating roller, the main parts, such as the pressure roller of the belt press type dehydrator, the pressure roller support frame, the pretreatment drum, and the dewatered cake hopper, etc. It is made of corrosion-resistant aluminum, carries a dehydrated cake capacity of about 1 ton, and is mounted on a truck with a total vehicle weight of less than 8, which can be driven with a regular driver's license. In addition, the drive of the dehydrator's belt and the various pumps are fully hydraulic, using a vehicle engine, making it possible to dewater sludge even in processing plants without power supply equipment.

According to the present invention, dewatering of sludge generated at each sewage treatment plant can be carried out economically and efficiently by visiting small-scale decentralized sewage treatment plants in a short time. Since the ingredient chemical is added, the dehydration rate is improved, and since the exhaust heat of the engine is used to perform dehydration using P cloth and further dehydration, the moisture content of the dehydrated cake is lower than that of conventional methods. Since it is equipped with a hopper to transport the dehydrated cake for disposal, it has many advantages, such as eliminating the need for other dump trucks and eliminating the need for dewatering equipment at each sewage treatment plant.

[Brief explanation of drawings]

FIG. 1 is an explanatory diagram showing the sludge dewatering process according to the present invention;
FIG. 2 is a front view of the embodiment, and FIG. 6 is a plan view thereof. C... Truck, 1... Sludge pump, 2m, 2b.
... Chemical injection pump, 6 ... Line mixer, 4 ... Pretreatment drum, 4a ... Coagulation mixing section, 4b゛ ... Concentration section, 4o ... Washing water regeneration section, 5a, 5b ...・Chemical solution tank, 6... Dehydrator, 6a, 6b... Sweating cloth, 6o...
Wedge-shaped pressure section, 6d...Roller pressure section, 6e...
Discharge part, 7... Heating roller, 8... Dehydrated cake hopper, 9L, 9b... Washing device, 90... Hopper, 10... Circulation pump, 11... Washing water tank, 1
2...Washing water pump.

Claims (1)

[Claims] (1) A pretreatment device for mixing and concentrating sewage sludge with a flocculant, a belt press type dehydrator for dewatering the sludge, a dewatering cake hopper for temporarily storing the dehydrated cake, and all of these. A mobile dehydration vehicle, comprising a mobile dehydration vehicle loaded with a dehydrator, and a frame for supporting at least the pressurizing port to the pressurizing roller of the dehydrator is made of aluminum. (2) The above-mentioned The dewatering vehicle according to claim 1, wherein the mobile dehydrating vehicle has a total vehicle weight of less than 8.