KR100425521B1 - Odor Removal Method of Septic Tank - Google Patents

Abstract

The present invention is to remove the odor generated in a single purification tank generally applied to the most widely used, while absorbing the odor from the odor removal device installed therein while reducing the odor component generated in the septic tank using a odor control agent. The present invention relates to a method for removing odor of a septic tank, which is then discharged.

By completing the present invention, it is possible to provide a method for removing odor of a septic tank, which has an excellent odor removing function and has a simple configuration, low maintenance cost, and easy management on a septic tank user side.

Description

Odor Removal Method of Septic Tank

In the present invention, in order to remove odor generated in a single purification tank that is widely applied, the odor control agent is used to absorb and remove the odor from the odor removal device installed inside the septic tank while simultaneously reducing the odor components generated in the septic tank. As to the odor removal method of the septic tank, the odor removal method of the septic tank, including the odor removal function, simple structure, low maintenance costs, and easy management from the user's side of the septic tank.

Recently, the contractors of apartments, which are being constructed in new towns and mini-new towns, are competing in the housing construction market by providing high-tech internet services, landscaping, and aftercare methods. This is due to the improvement of living standards and the change of consumption culture, which has brought the attention to the residential environment. In the consciousness of the people, the residential space is no longer perceived as a place to solve only lodging, but leisure and rest. In other words, it is recognized as a place where even health and natural factors must be satisfied.

Therefore, modern people are forming new residential cultures by selecting or improving residential spaces that meet their own needs.In terms of creating green spaces, neighborhood parks, playgrounds, and other visible surroundings, consumers have already been Although it has received a lot of attention as a diverse contact area, the management and treatment facilities of household wastewater and sewage are not yet easily accessible or identified by consumers.

As the accessibility of consumers is not easy, the interests of producers are lessened and management is neglected, and these facilities often cause various odor complaints as hate facilities.

There are about 20 kinds of malodorous gases that can be generated in a single septic tank.

First, there are sulfur sulfides such as hydrogen sulfide, dimethyl sulfide, dimethyl di-sulfide, and methyl mercaptan.

Second, ammonia is ammonia, methylamine, putrescene and cadaverine.

Third, volatile fatty acids include Acetic Acid, Propionic Acid, Butylyric Acid, and Valeric Acid.

Fourth, phenols include Phenol, p-Cresol, Indole, and Skatole.

Occurrence concentrations of various odor-causing substances are different depending on the characteristics of the influent source and operating conditions of the septic tank, but ammonia and hydrogen sulfide generally dominate the odor.

Comparing the minimum detectable values of human odor for the two malodorous gases, hydrogen sulfide is 0.06 ppm, ammonia is 2 ppm, which means that hydrogen sulfide can be detected as a odor even at a small concentration compared to ammonia. Therefore, it can be seen that even at the same concentration of odor gas, hydrogen sulfide can cause much more discomfort to people than ammonia. The relative concentrations of odor intensity for ammonia and hydrogen sulfide are shown in Table 1 below.

In Table 1 below, the odor strength of 2.5 to 3.5 ranges from "smell that can be easily felt by a person."

Relative Concentrations of Ammonia and Hydrogen Sulfide According to Odor Intensity Smell One 2 2.5 3 3.5 4 5 ammonia 0.15 0.59 1.2 2.3 4.6 9.2 37 Hydrogen sulfide 0.0005 0.0056 0.019 0.063 0.21 0.72 8.1

Odor treatment facilities or methods are generally applied to composting facilities, odor generating facilities in industrial areas, and sewage treatment plants.

Currently applied methods generally include chemical neutralization, soil treatment, activated carbon adsorption, combustion, etc. Table 2 below compares the characteristics of each of these methods.

Characteristics of Common Odor Treatments Treatment method Principles and Features Economics Processing efficiency Remarks Construction cost upkeep expenses Drug neutralization method Neutralization and absorption low price high price Good Handling of chemicals Secondary treatment of treated water is required Soil treatment Decomposition of odor by soil microorganisms low price low price Good Easy to manage, suitable for low capacity Activated Carbon Adsorption Adsorption using activated carbon low price high price Good The processing time is fast. Combustion method Burning odor gas high price high price Great Applicable to all odors

Odor generated in a single septic tank is not a serious situation compared to odor generating sources (compost facilities, etc.) that have different amounts of odor intensity and odor, but due to the characteristics of septic tanks, frequent complaints occur. Odor treatment methods are methods applied to treat a large amount of odor, and are not suitable for applying the treatment system to septic tank odor treatment as it is.

Therefore, as another solution for the odor treatment of septic tanks, rather than treating the odor, it is generally used to dilute and diffuse the air to the roof of a building through a ventilation system, which is expensive. It has the disadvantages such as noise problem from the large-capacity fan used to discharge gas to the rooftop and corrosion problem of the machine, and it is not basically a method of removing odor.

In addition, deodorants may be used in septic tanks, but this method is also cumbersome and expensive, and is a temporary solution, and is not a fundamental solution. have.

In view of this, most of the conventional techniques for removing odor have common problems such as excessive installation cost of installation, complexity of process, difficulty of maintenance, and difficulty of construction.

Therefore, it can be said that it is an urgent need for the development of a fundamental method that is more environmentally friendly and can treat odor gas at low cost.

So far, the patented method for removing odors includes, firstly, a catalyst for removing hydrogen sulfide mainly containing Fe (NO ₃ ) ₃ (Korean Patent Publication No. 1999-78967) and a deodorant for organic wastes consisting mainly of quicklime and sulfur ( There are deodorants for odor removal, such as Korean Patent Publication No. 1999-24150), an air purifier in a barn that oxidizes odor components using an ozone generator (Korean Patent Publication No. 2000-6836), and gypsum and coal ash. And a method or apparatus for removing livestock odors, such as a method for removing livestock odors using microorganisms (Korean Patent Publication No. 2000-18207), and sulfur which adsorbs and removes odors using activated carbon fibers to which potassium iodide is added. Method for removing compound odor (Korean Patent Publication No. 1999-14618) and Method for removing sulfur compound odor using microorganisms (Korean Patent Publication, there are a method of removing the primary destination odor compound, a sulfur compound of the present invention, such as No. 1998-65158).

However, none of the above formulations, methods or apparatuses is intended to provide a odor removal device of an independent and closed system or a system itself equipped with such a odor removal device as in the present invention.

Examples of patents in which the odor removal device is applied to an independent system include a odor removal device for a fermenter that removes fermentation odor of organic matter by using the decomposition of microorganisms supported on a carrier and the oxidation of an ozone generator (Korean Patent Publication No. 2000-263662). And odor removal apparatus (Korean Patent Publication No. 85585) of a food waste disposal system which removes odor using a catalyst at a temperature of 200 to 400 ° C.

However, there is no example provided with a device for removing the odor of the septic tank or a septic tank equipped with such a device, in the case of the present invention, in that the septic tank is the most common facilities around us among the odor generating facilities. Development is urgently needed.

The present invention is to accommodate such a demand and its ultimate object is to solve the problems such as excessive ventilation installation cost, complexity of the process, difficulty of maintenance, difficulty of construction, etc. that the prior art has, It is to provide a odor removal method of the septic tank easy to manage.

To this end, the present invention achieves the unification and reduction of the decaying odor gas by using a malodor control agent mixed with red yellow ocher and powdered elvan, and the odor gas by using an acidic device and an absorbent liquid to bubble the odor gas thus reduced. It is made to provide the odor removal method of a septic tank which uses the odor removal apparatus which processes and discharges completely.

1 is a cross-sectional view of a septic tank combining a malodor control agent and a malodor removing device according to the present invention

[Description of Symbols for Main Parts of Drawing]

31: Absorption tank 32: First decay tank

33: Second Septic Tank 34: Precipitation Filtration Tank

35: blower 36: diffuser

37: gas inlet pipe 38: gas outlet

39: air intake

Hereinafter, the septic tank odor removal method of the present invention will be described in detail with reference to the accompanying drawings.

Nitrogen and sulfur components contained in the sewage are converted into ammonia and hydrogen sulfide by microorganisms, etc., which are primarily dissolved in water and vary in form depending on the pH of the sewage. In this case, H ₂ S is the main odor gas and is released into the atmosphere. At high pH, ammonia is the main odor gas and is released into the atmosphere.

In the present invention, hydrogen sulfide having the highest odor contribution among odorous gases generated from sewage is dissolved in water by increasing the pH, and ammonia, whose amount increases with increasing pH, has a cation exchange capacity of about 13.5 mg / g. It is removed by ion adsorption using the inventive malodor control agent. H ₂ S dissolved by high pH is purified through sewage pipes or by means of a separately prepared end treatment facility, which is much simpler than the odor treatment.

The malodor control agent used in the present invention contains 45-55% SiO ₂ , 25-30% Al ₂ O ₃ , 10-15% Fe ₂ O ₃ and has a specific surface area of 20 m ² / g or more and It is composed of 30 to 50% of red-yellow ocher with a pH of 7.0 to 7.5 and 50 to 70% of powdered rock mass, and has a pH control ability to control the pH of the sewage and a cation exchange ability to adsorb cations.

Such malodor control agent is processed into a red-yellow loess of the composition in the form of a particle of about 80 to 100 mesh and put into an automatic mixer, so that boron (B): 0.3 to 0.5%, sodium chloride (NaCl): 0.5 to 0.7%, magnesium sulfate (MgSO ₄ ): 0.2-0.4%, Agar: 0.5-0.7%, and mix well, add water so that the water content is about 20% in this formulation, the temperature is 30-35 ℃ After stabilization for 72 hours or more in the maintained state, dried in the state of nature to process into particles of 80 ~ 100 mesh, 30 to 50% of the processed ocher, 50 to 70% of powdered elvan rock sifted to about 60 to 100 mesh By powdering.

The mechanism of removing odor from sewage using such malodor control agent will be described in detail with reference to FIG. 1.

The anaerobic sewage from the first and second decay tanks 32 and 33 is solid-liquid separated from the sedimentation filtration tank 34 and then the treated supernatant is transported to sewage pipes or terminal treatment facilities.

Hydrogen sulfide in the malodorous gas produced as a by-product of the decay tank (32) (33) is dissolved in the treated water by the pH control ability of the malodor control agent of the present invention and then discharged to the sewage pipe or terminal treatment plant through the precipitation filtration tank (34).

The hydrogen sulfide thus dissolved and discharged into the upper air of the septic tank without being treated in the aqueous phase is guided to the present malodor removing device through the gas suction pipe 37 and the blower 35 and then into the neutral pH water through the acid pipe 36. Dissolved and dissolved, and thus dissolved hydrogen sulfide gas is also transported to sewer pipes or terminal treatment facilities.

The ammonia in the odor gas is primarily adsorbed by the cation exchange capacity of the malodor control agent of the present invention, and the ammonia discharged into the upper air of the septic tank without adsorption is also led to the present malodor removing device through the suction pipe 37 and the blower 35. After that, the acid is dissolved in neutral pH of water through the acid pipe 36.

Looking at the mechanism of the odor removal action according to the present invention in detail.

Hydrogen sulfide in the decaying tank or malodorous substances produced in the odor removing device solution of the present invention is dissolved in the form of HS ^- by the high pH of the aqueous solution, and ammonia is adsorbed and removed by high adsorption power such as ocher in the odor control agent. do.

^{_{H 2 S → HS - + H}} +

When the raw sewage water enters the first septic tank in the septic tank combined with the odor control agent according to the present invention, the pH is lowered to about 6.0 to 6.5 due to the action of anaerobic microorganisms and hydrolysis and organic acid reaction, in this pH range The proportion of sulfides in water is 75-90% for H ₂ S, 10-25% for HS ⁻ , 99.85-99.95% for NH ₄ ⁺ form and 0.05 to 0.15% for NH ₃ form for ammonia. It can be seen that most of the odor component is hydrogen sulfide.

In this way, while the odor control agent for the adsorption and a pH buffer action of the odor component in the same conditions as in volume compared to 1,000mg / L in a first septic tank by adjusting the pH of the treated water to between 7.0 to 7.5, the ratio of water sulfide H ₂ The proportion of H ₂ S is drastically reduced to 25 to 50% for S and 50 to 75% for HS ⁻ .

In the case of ammonia, NH ₄ concentrations are 99.5 to 98.5% and NH ₃ concentrations are 0.5 to 1.5%, so the NH ₃ concentration ratio is only slightly increased. You will be able to.

In addition, the odor control agent used in the present invention can ion adsorb the ammonium ions in water through its cation exchange capacity, which further reduces the amount of ammonia emitted as odor by shifting the chemical equilibrium of ammonia in water such as Let's go.

NH ₄ ⁺ ⇔ NH ₃ + H ⁺

The amount of ammonium ion adsorbed on the odor control agent is about 13.5 mg / g.

Hereinafter, the present invention will be described with reference to test examples, but the present invention is not intended to be limited thereto.

[Test Example]

Artificial sludge, glucose and urea components, each of which was prepared at a concentration of 1,000 mg / l, were mixed in a 250 ml flask in a composition as shown in Table 3 below to prepare five samples (Comparative Examples 1 to 3).

After sealing the sample thus formed and forming anaerobic conditions for about 40 days, the gas amount, pH, BOD and the like were measured and the results are shown in Table 4 below.

Composition of Comparative Example and Test Example ingredient Comparative Example 1 Comparative Example 2 Test Example 1 Test Example 2 Test Example 3 Sludge 100 100 100 100 100 glucose 100 90 100 90 90 Element - 10 - 10 10 Odor Control 1,000 ppm 1,000 ppm 2,000 ppm

(Unit: ml)

Effect test result Test Items Comparative Example 1 Comparative Example 2 Test Example 1 Test Example 2 Test Example 3 Total BOD 144 231 144 231 231 BOD after treatment 31 35 30 35 23 pH 6.1 5.9 5.8 7.5 7.2 Gas volume 2 13.5 1.5 24.5 2 NH ₃ - - - 10 7.5 H ₂ S 5-10 5-10 5-10 0.3 -

(Unit: ppm)

As a result of the above test examples 1, 2 and 3 it was confirmed that the pH buffering action by the combination of the odor control agent and the urea component and the odor component unification to ammonia gas.

In particular, in the case of Test Example 3, the cation exchange capacity of the malodor control agent is confirmed, and compared with Test Example 2 under the same conditions, the amount of NH ₄ ⁺ ion adsorption increases as the amount of the malodor control agent of the present invention increases. It can be seen that by reducing the overall ammonia concentration.

By completing the present invention as described above, by using the malodor control agent mixed with red yellow ocher and powdered rock stone to achieve the unification and reduction of the decaying odor gas, using an acidic device and an absorbing liquid to bubble the odor gas so reduced The odor removal method using the odor removal apparatus which completely processes and discharges odor gas can be provided.

The septic tank odor removal method of the present invention is to clean the odor by treating the odor using only natural friendly components without using an expensive deodorant or chemicals that are not suitable for the environment. It will play a part in creating a living space.

Claims (5)

delete delete delete delete In the odor removal method of a septic tank, First and second septic tanks 32 and 33, which remove organic matter contained in raw water by the action of anaerobic and random microorganisms, and first and second septic tanks 32 and 33 through the precipitation and filtration functions. 45-55% of the first decay tank 32 of the odor removal septic tank system comprising a sediment filtration tank 34 for solid-liquid separation of sewage treated in 30 to 50% of red yellow ocher containing SiO ₂ , 25 to 30% Al ₂ O ₃ , 10 to 15% Fe ₂ O ₃ , specific surface area of 20m ² / g or more and the pH of the aqueous solution is 7.0 to 7.5 The odor control agent which comprises 50-70% of the powdered agglomite stones is added, and the odor gas is first removed, and the odor gas which is not removed and is discharged into the air in the septic tank is a gas suction pipe 37 and a blower which collects the odor from the decay tank. blower (35), an air diffuser that diffuses odors collected in water through gas suction pipes and blowers 36, and the acid in a water bath made of water for dissolution and absorption of odor gases from the engine group odor, odor of the tank, characterized by absorption and elimination method using the device.