JP4030496B2 - Organic sludge treatment method and treatment equipment - Google Patents

Description

  The present invention relates to a method for treating waste such as garbage, human waste, sludge and the like in municipal waste, slurries, chips, and the like (hereinafter collectively referred to as “organic sludge”), and equipment therefor.

  Garbage generated in large quantities from schools, restaurants, hospitals, homes, etc., wastes mainly composed of organic matter such as food waste, human waste, sludge, etc., are subject to incineration and sewage treatment according to the moisture level. However, both are vast sites and processing methods that consume a great deal of energy, and in addition, some secondary processing such as incineration ash and processing residue occurs, and new environmental pollution occurs in the processing process. There are many problems and improvement is desired.

  An object of the present invention is to solve the above-mentioned problems and to realize an organic sludge treatment method and treatment equipment that does not emit waste at a low cost.

The method for treating organic sludge according to the present invention is as follows. The organic sludge is diluted with water as necessary and then introduced into the adjustment tank, then transferred to the aeration tank for aeration treatment, and then the treatment liquid is filled with Merton chips. The filtration reaction tank surface is sprayed to pass through the tank , and the discharged liquid is returned to the adjustment tank and repeatedly circulated. Desirably, the filtration reaction tank is provided with stirring means, and the inner surface portion of the tank The method for treating organic sludge is a method for treating quality sludge.

The organic sludge treatment facility of the present invention includes an adjustment tank for introducing organic sludge, a plurality of aeration tanks for performing aeration treatment in a liquid containing Merton chips, and a submerged pipe for spraying the effluent from these aeration tanks. has, a filtering reactor packed with Merton chip, characterized in that connected in series in this order in a closed conduit to cycle, the stirring means preferably agitating the intracisternal surface portion to the filtration reactor It is the processing equipment of the said organic sludge provided.

  According to the present invention, organic sludge is processed without consuming a large amount of energy on a small number of sites, and no residue, noxious gas, sewage, etc. are discharged. Therefore, energy saving and environmental pollution prevention are ideally achieved. It has an excellent effect.

  In the present invention, the stock solution containing organic sludge is subjected to aeration treatment, passes through a filtration tank filled with Merton chips, decomposes organic matter while circulating while contacting with Merton chips, and becomes carbon dioxide gas and water vapor. In other words, no residue is left and no bad odor is generated in the surroundings.

  Merton chips are crushed butter made from cedar and crushed to a size of 0.5 to 4.0 mm. It consists of about 65% cellulose, about 10% hemicellulose pentosan, and about 20% lignin. It is rich in water retention, draining, and heat retention, is particularly excellent in deodorizing power and fermentation power, and is optimal as a contact material for digestion of organic sludge.

Since the surface area of the Merton chip is as large as about 30 m ² per 1 g, the reaction proceeds at a high speed. Since aerobic and anaerobic bacteria are generated, wet contact aeration in an aeration tank and dry contact filtration in a filtration reaction tank are used to ferment, decompose, and digest organic sludge using the activity of amphoteric bacteria. ing. When the treatment facility is large, it is desirable to provide a stirring means for stirring the inside of the filtration reaction tank to make the inside of the layer uniform and forcibly contact the treated water with the Merton chip.

  The filling amount of Merton chip is about 100 times the amount of passing water.

  Embodiments of the present invention will be described with reference to the drawings. FIG. 1 is a system diagram showing an organic sludge treatment facility according to an embodiment, wherein 1 is an adjustment tank that also serves as a stock solution inlet, 2 to 4 are first to third aeration tanks, 5 and 7 are transfer pumps, and 6 is a transfer tank. A filtration reaction tank, 61 is a submerged pipe, and 64 is an outflow tank.

  The organic sludge is introduced into the adjustment tank 1 while being diluted with water as necessary. The slurry can be added as it is. If a lump is included, grind it appropriately with a disposer. The introduced stock solution is sent to the first to third aeration tanks 2 to 4 by the circulating fluid sent by the upstream transfer pump 7. In addition, at the time of an operation start, water shall be previously put into each aeration tank 2-4. While passing through each of the aeration tanks 2 to 4, it is brought into contact with air, and further sent to the filtration reaction tank 6 by the transfer pump 5 and filtered. repeat. Merton chips are mixed in the circulating liquid by passing through the filtration reaction tank 6.

  FIG. 2 is a schematic diagram showing the structure of the aeration tank 2, 21 is an inflow pipe, 22 is an air outlet for aeration for discharging air from a blower (not shown), 23 is an aeration chamber, and 24 is a partition from the aeration chamber. A settling chamber 25 is separated, 25 is a vent provided in the ceiling of the aeration chamber, and 26 is a discharge pipe. Contact with the Merton chip in the circulating fluid and aeration eliminate the BOD source in the stock solution.

FIG. 3 is a schematic view showing the structure of the filtration reaction tank 6. The inside is constituted by two shelves 63 and the upper and lower filtration chambers 62 are filled with Merton chips. The circulating liquid is sprayed from the upper submerged pipe 61, filtered while in contact with the Merton chip, and dropped onto the outflow trough 64 at the bottom.
Merton chips serve as filters for filtration and as carriers for microorganisms that perform fermentation, decomposition and digestion reactions.

In addition, in a large processing facility, it may be divided into two layers and arranged in place of two upper and lower stages. In the case of a large processing facility, it is effective to provide the filtration reaction tank 6 with a stirring means for stirring the inside of the tank. An example of the stirring means will be described with reference to FIGS. 4 is a partial front view of the filtration reaction tank 6 showing the vicinity of the stirrer 65, FIG. 5 is also a partial side view thereof, 651 is a traveling rail provided on the upper edge of the filtration reaction tank 6, 652 is a traveling wheel, and 653 is a stirrer. This is a spiral stirring shaft suspended from the lower part of 65. The stirring shaft 653 is suspended to a height that reaches the Merton chip filled in the filtration chamber 62 in the tank. The spiral stirring shaft 653 is slowly rotated by a rotation mechanism (not shown) to force the treated water and the Merton chip. At the same time, the reaction is further promoted, and at the same time, the agitator 65 is slowly moved over the entire surface of the filtration reaction tank 6 by the traveling wheels 652, whereby the reaction in the tank is made uniform .

  The power required for this processing equipment is only a transfer pump for circulating the liquid and a blower for aeration other than the stirring means, and only water and Merton chips are replenished. On the other hand, water vapor and carbon dioxide are discharged, and there is no problem even if both are diffused into the atmosphere. No solids, toxic gases, sewage, etc. are discharged.

If small treatment facility processing amount of about 1 day 50kg of organic sludge, aeration tank about one group is 3m ^3, because good at about filterability reaction vessel 60 m ^3, may be any site of at most 10 m × 10 m, it is sufficient if about 5000m ² in large-scale facilities that 1 day 15 tons.

  As an example of design, if the BOD value of the circulating fluid at the outlet of the adjustment tank 1 is 30000 ppm, the outlets of the first to third aeration tanks 2 to 4 are 10000, 5000, and 1000 ppm, respectively. 20ppm or less at the exit.

It is a systematic diagram which shows the processing equipment of the organic sludge of an Example. It is a schematic diagram which shows the aeration tank of an Example. It is a schematic diagram which shows the filtration reaction tank of an Example. It is a partial front view of the filtration reaction tank which shows an example of the stirring means of this invention. It is a partial side view of the filtration reaction tank which shows an example of the stirring means of this invention.

Explanation of symbols

1 Adjustment tank 2, 3, 4 Aeration tank 5, 7 Transfer pump 6 Filtration reaction tank
21 Inflow pipe
22 Air outlet
23 Aeration chamber
24 Settling chamber
25 Vent
26 discharge pipe
61 Water pipe
62 Filtration chamber
63 Shelf
64 Spillage
65 Stirrer (stirring means)
651 Rail
652 Traveling wheels
653 Stirrer shaft

Claims (4)

After diluting the organic sludge with water as necessary, it is transferred to the adjustment tank, then transferred to the aeration tank for aeration treatment, and then sprayed on the surface of the filtration reaction tank filled with Merton chips. A method for treating organic sludge, wherein the waste liquid is passed through the interior and returned to the adjusting tank and repeatedly circulated. The processing method of the organic sludge of Claim 1 which provides a stirring means in the said filtration reaction tank, and stirs the inner surface part of a tank. Adjustment tank (1) for introducing organic sludge, a plurality of aeration tanks (2, 3, 4) for performing aeration treatment in a liquid containing Merton chips, and discharged liquid from these aeration tanks (2, 3, 4) the a watering tube for spraying (61), a filtration reactor packed with Merton chip (6) and the processing of organic sludge, characterized in that connected in series in this order in a closed conduit to cycle facilities . The processing equipment for organic sludge according to claim 3, wherein the filtration reaction tank (6) is provided with a stirring means (65) for stirring the inner surface portion of the tank.

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