JPH04118023A - Method and device for deodorization using excrement soil of earthwork - Google Patents

Abstract

PURPOSE:To widely improve the removing efficiency of nitrogenous, sulfurous odorous ingredients by passing the gas to be treated into one or more layers of the packed layers of an excrement soil of an earthworm wetted with water, then passing one or more layers of relevant layers wetted with alkaline water. CONSTITUTION:The neutral layers 41, 42 are constituted of water wetted parts, wetted with water, and water 34 is sprinkling to the neutral layers 41, 42 through the sprinkler pipes 35, and excess water is drained from a draining pipe 36. The alkalinized layer 43 is constituted of the alkaline water wetted part packed with the excrement soil of the earthworm wetted with the alkaline water, and the alkaline water is sprinkled to the alkaline layer 43 through the sprinkler pipe 22. The splinkled water is supplied through the supplying pipe 25 by a pump 29, and the water returning pipe 24 returns excess water in the alkaline layer into a tank 28. The odorous gas is made, at first, pass through neutral layers 41, 42 and collected all of the nitrogeneous odorous ingredient and a part of the sulfurous odorous ingredient, and then is made pass through alkaline layer 43 to collect residual sulfurous odorous ingredient. By this means, deodorizing efficiency is widely improved.

Description

[Detailed Description of the Invention] [Industrial Application Field 1] The present invention is a method for controlling odor components generated from cleaning facilities for garbage, human waste, sewage, etc., animal processing plants, chemical plants, livestock baths, feed factories, etc. , relates to a deodorizing method using worm excrement and an apparatus therefor.

[Prior art] A method for deodorizing gas using worm excrement is disclosed in
As disclosed in JP-A No. 10553 and JP-A-2-56216, this method is more effective than other biological oxidation methods such as activated sludge deodorization, soil deodorization, or activated carbon adsorption.

However, in the deodorizing method using worm excrement,
Nitrogen-based odorous gases, particularly ammonia, exhibit excellent adsorption and decomposition, but the deodorizing effect of sulfur-based odorous gases such as hydrogen sulfide and methyl mercaptan is insufficient.

[Subject to be solved by the invention 1 The present invention solves problems for which the above-mentioned prior art is insufficient, c! 5
．． The purpose of the present invention is to provide a method and apparatus that are highly effective in deodorizing sulfur-based odor gases.

The apparatus of the present invention adopts the conventional water-wetting method for adsorption and decomposition of nitrogen-based odors, and uses alkaline water for adsorption of sulfur-based odors to control pH. The purpose of this is to improve the management of the removal efficiency of nitrogen-based and sulfur-based gas odor components.

[Means for Solving the Problems] In order to solve the above problems, the present invention provides a deodorizing method in which a gas to be treated containing an odorous gas is passed through a plurality of packed beds filled with worm excrement to remove an odorous gas. , wherein the gas to be treated is passed through one or more of the packed beds moistened with water, and then passed through one or more of the packed beds moistened with alkaline water. This is the deodorizing method used.

The device of the present invention that can suitably carry out the above method is a biological oxidation deodorizing device that uses worm excrement as a deodorizer, and includes a packed layer that keeps a part of the filler alkaline.
This packed bed is equipped with a circulation system for warming and moistening the filler.

This circulation system is composed of a supply pipe and a return pipe each provided with a water sampling port for pH measurement.

[Effect] Table 1 shows the results of an adsorption test of odor gas using wet worm excrement. The test was the same except that the type of odor gas mixed into the nitrogen gas was changed to ammonia, hydrogen sulfide, and methyl mercaptan.

Ammonia was completely adsorbed and deodorized, but hydrogen sulfide and methyl mercaptan were not sufficiently adsorbed and deodorized.

Table 2 shows the solubility of each odor gas at room temperature.

From Tables 1 and 2, it is considered that the difference in the deodorizing effect of the odorous gases is due to the solubility of the odorous gases in water.

The deodorizing effect of worm excrement is due to the fact that individual feces are porous and have the property of storing and adsorbing odor gases, and worm excrement also contains digestive enzymes and bacteria that decompose various odor gases. In order to activate these digestive oxygen and bacteria, the presence of an appropriate amount of moisture is necessary, and the odor gas first dissolves into water, which is then absorbed by microorganisms. The basic idea is to oxidize and decompose it into odorless or low-odor substances.

Therefore, since the sulfur-based odor gas has low solubility in water, it is difficult to be captured by worm excrement, and the deodorizing effect is low.

If alkaline water is used to moisten worm manure, it is possible to chemically neutralize hydrogen sulfide and increase the amount of dissolved water into the water, which is then oxidized and oxidized by the action of microorganisms. It can be decomposed and the deodorizing effect can be improved.

FIG. 2 is an explanatory diagram of the adsorption test apparatus, in which 1 is a cylinder of nitrogen gas as dilution gas, 2 is a test gas generator that mixes the odor gas to be tested into the dilution gas to a predetermined concentration, 3 is a valve,
4 and 5 were adsorption towers, 4 was filled with water temperature moist worm manure 6 and 5 was filled with alkaline water temperature moist worm manure ±7.

The worm manure used in the test had a particle size of 3 to 7 mm and a moisture content of 12.
%, p) (5.5), moistened with water to a moisture content of 57%, and moistened with alkaline water to a moisture content of 57% and pH 8, was placed in the adsorption tower 4. @Tower 5 was filled.

A test gas generator generates a nitrogen/hydrogen sulfide mixed gas, and the pressure, flow rate, and concentration of the gas are kept constant and the gas is pumped into the suction tower 4.
．． 5, and the adsorption performance was compared. The test results are shown in Table 3.

When wet with water, the adsorption rate was 50%, but when wet with alkaline water, it was 100% adsorbed, and the effect was clear. The subsequent pH dropped to 6.0, confirming that the hydrogen sulfide was chemically captured.

Nitrogen-containing odorous gas may be decomposed by alkali and release ammonia, so in a deodorizing method in which the gas to be treated is passed through multiple packed beds filled with worm excrement, the odorous gas is first passed through a water-moist packed bed. The deodorizing efficiency is greatly improved by trapping all of the nitrogen-based odorous gases and a part of the sulfur-based odorous gases, and then passing through an alkaline water wet packed bed to capture the remainder of the sulfur-based odorous gases. I can do it.

The respective calendar numbers of the water wet packed bed and the alkaline water wet packed bed are appropriately determined in consideration of the type and amount of the odor gas.

The moisture content in the packed bed is preferably about 30 to 60%, and in order to make the wetting water alkaline, soda carbonate, caustic soda, etc. can be used, and the pH of the alkaline water wet packed bed is:
8.0 to 10.0, taking into account the content of sulfur-based odor gas, etc.
It is considered to be a degree.

f Example] Example 1 A deodorizing device, a schematic diagram of which is shown in FIG. 1, was installed above the digestion tank of a human waste water tank for 200 people. In the figure, 8 is a digestion tank, 9 is a valve, 10 is an intake blower, 11, 12, 13 is a worm manure filling layer, and 14 is a deodorizing gas exhaust port.

Each filling layer is 50cm long x 50cm wide x thick]Oc
m, the volume is 259, and the capacity of the intake blower is 3r.
n'/min, 90 mmAq.

The illustrated arrows indicate the flow of the gas to be processed.

Worm manure with a particle size of 3 to 7 mm, a water content of 12%, and a pH of 5.5 was moistened with water to a water content of 57%, and a packed bed of 11.1
2.13, the packed bed 12.13 was the above-mentioned water-moist packed bed, and the packed bed 11 was made of the above-mentioned worm manure using soda carbonate to make it alkaline with a water content of 57% and a pH of 9.0. In this case, ammonia and hydrogen sulfide in the intake and exhaust air were measured three times once per day by the detector tube method. Table 4 shows the determination results. The gas to be treated could be completely deodorized by passing it through a water moist packed bed and then passing it through an alkaline water moist layer.

Example 2 FIG. 3 is an example showing in detail the control system for the alkaline layer of a biological deodorizing tower. The neutral layers 41 and 42 are water-wet parts, and the alkaline layer 43 is an alkaline water-wet part. The gas 32 that pushes in the odor 31 from below and passes through the neutral layers 41 and 42 passes through the alkaline layer 43 and is discharged from the upper part as exhaust gas 33. Water 34 is sprinkled onto the neutral layers 41 and 42 through a sprinkler pipe 35.

Water drained from the surplus is drained through drain pipe 36.

The mechanism of the alkaline water wetting section 43 will be explained.

The alkaline layer 43 has a filler input section 21 at the top and a filler takeout section 23 at the bottom. Alkaline water sprinkler pipe 2
2. Sprinkle water from the top of the alkaline layer. This watering is supplied by a pump 24 via a supply pipe 25. Return pipe 2
4 returns surplus water in the alkaline layer 43 to the tank 28. The supply pipe 25 and the return pipe 24 are each provided with a sampling pipe 26 for pH measurement. Also, the return pipe 24 is connected to the tank 2.
A filter 27 is provided at the portion where the filter 8 enters.

The alkaline water supply pump 29 is operated and water is sprinkled from the upper water sprinkling pipe 22. Sunblink pipe 26 attached to return pipe 24
Sample water and measure pH.

Furthermore, during operation, water is sampled from the sampling section 26 of the supply pipe 25, the alkalinity of the tank liquid is measured, and the pH is adjusted as necessary. Any alkaline agent may be used as long as it is non-toxic to living things, and it may also serve as a nutrient by adding ammonium phosphate or the like as a buffer.

Strong alkalinity is not suitable for the growth of microorganisms, and the normal p+ range of 8 to 9 is desirable. Within this range, there is no problem with the activity of microorganisms. When the pH is lower than 7, the efficiency may decrease.

The pi-1 measuring device may be a stationary type, or a portable pH meter may be used to measure when necessary.

[Effects of the Invention] According to the present invention, it has been possible to significantly improve the deodorization of gases such as hydrogen sulfide and methyl mercaptan as well as ammonia gases generated from human waste treatment equipment and the like.

[Brief explanation of drawings]

FIG. 1 is a schematic diagram of the deodorizing device used in the example, FIG. 2 is an explanatory diagram of the adsorption test device, and FIG. 3 is a cross-sectional side view of the example. 1...Nitrogen gas cylinder 2...Test gas generator 3.9...Valve 4.5...Adsorption tower 6...
・Water temperature moist worm manure 7...Alkaline water temperature moist worm manure 8...Digestion tank 10...Intake blower 11
．． 12.13... Worm manure packed bed 14... Deodorizing gas exhaust port 22... Alkaline water sprinkling pipe 24... Return pipe 25... Supply pipe 26...
・Sampling tube

Claims (1)

[Claims] 1. A deodorizing method in which a gas to be treated containing an odorous gas is passed through a plurality of packed beds filled with worm excrement to remove the odorous gas, wherein the gas to be treated is moistened with water. A deodorizing method using worm excrement, which comprises passing through one or more of the packed beds and then passing through one or more of the packed beds moistened with alkaline water. 2. In a biological oxidation deodorizing device that uses worm excrement as a deodorizing agent, a packed layer that keeps a part of the filler alkaline is provided, and the packed layer is connected to a supply pipe and a return pipe each having a water sampling port for pH measurement. A deodorizing device using worm excrement, characterized in that it is equipped with a circulation system for moistening the filler.