JPH1157730A - Deodorant and removal of malodorous component - Google Patents

Abstract

PROBLEM TO BE SOLVED: To effectively, continuously and safely deodorize the org. sewage developing a malodorous component such as hydrogen sulfide and methyl mercaptan and the sludge generated from the sewage. SOLUTION: This deodorant contains a metal ion forming a metal sulfide by contact with hydrogen sulfide and a metal ion capable of giving a sterilizing action to the malodorous component-metabolizing microorganism. The malodorous component is removed by adding a metal ion easily forming the metal sulfide by contact with hydrogen sulfide and a metal ion capable of giving a sterilizing action to the malodorous component-metabolizing microorganism to the sewage or sludge developing the malodorous component.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an organic sewage such as sewage, human waste, and wastewater and a method for removing deodorants and odor components from sludge generated therefrom.

[0002]

2. Description of the Related Art Organic sewage such as sewage, human waste, and wastewater and sludge generated from these odors generate odors due to hydrogen sulfide, methyl mercaptan, and the like. Near sewage and sludge treatment facilities, the odor reduces the working environment, and in severe cases, workers may become poisoned. Further, when such sludge is transported by a vehicle or the like, odor becomes a problem on a general road, and the general public is inconvenienced.

[0003] In order to prevent this, various deodorants and removal methods have been devised. A typical example is a method called a metal salt method in which a solution of ferric chloride or zinc chloride containing iron or zinc as a main component is appropriately diluted with industrial water or the like and added to sewage or sludge. This is intended to separate and remove hardly soluble salts by reacting hydrogen sulfide as an odor component with iron ions and zinc ions. In some cases, an oxidizing agent such as chlorite is used, which is a method of deodorizing by oxidatively decomposing malodorous components such as hydrogen sulfide methyl mercaptan. Furthermore, there is a method in which a bactericide made of a chlorine compound or the like is added to eliminate putrefactive bacteria to prevent putrefaction and prevent odor components from being emitted. These conventional methods may be used together.

[0004]

However, a deodorant containing iron, zinc, or the like as a main component can substantially only cope with the removal of generated hydrogen sulfide. It has little effect on removing other malodorous components such as methyl mercaptan. In addition, methyl mercaptan can be removed by administering a large amount of methyl mercaptan. However, this is not preferable because the pH of the wastewater is remarkably lowered, the properties of the sludge are changed, and the dewatering performance is lowered.

[0005] Furthermore, oxidizing agents such as chlorite are effective against hydrogen sulfide and methyl mercaptan, but they are not effective, and depending on the concentration of the chemical, may cause explosion. Had the nature. Accordingly, the present invention has been made to solve the above-mentioned problems, and therefore, it is possible to effectively, continuously and safely deodorize organic sewage which emits malodorous components such as hydrogen sulfide and methyl mercaptan and sludge generated therefrom. It is an object of the present invention to provide a method for removing an agent and an odor component.

[0006]

The above objects can be attained by the following method. (1) A deodorant comprising a metal ion which easily forms a metal sulfide upon contact with hydrogen sulfide, and a metal ion having a bactericidal action on odor component metabolizing microorganisms. (2) The deodorant according to (1), wherein the metal ion which easily forms a metal sulfide by contacting with hydrogen sulfide is zinc ion or iron ion. (3) The deodorant according to (1), wherein the odor component metabolizing microorganism is a microorganism that produces hydrogen sulfide, methyl mercaptan, ethyl mercaptan, propyl mercaptan, or butyl mercaptan by metabolism.

(4) The deodorant according to (1), wherein the metal ion having a bactericidal action on the odor component metabolizing microorganism is copper ion, silver ion or tin ion. (5) The method according to the above (1), wherein a metal ion which forms a metal sulfide easily by contacting with hydrogen sulfide or a metal ion having a bactericidal action on odor component metabolizing microorganisms is contained in the form of a metal salt compound. Deodorants. (6) The deodorant according to (1), wherein the metal ion having a bactericidal action on the odor component metabolizing microorganism is preferably contained in the form of a nitrate.

And (7) at least metal ions which come into contact with hydrogen sulfide to easily form metal sulfides, and metal ions which have a bactericidal effect on odor component metabolizing microorganisms, in sewage or sludge emitting odor components. And a method for removing odor components. Here, more preferably, (8) the method for removing an odor component according to the above (7), wherein the metal ion which easily comes into contact with hydrogen sulfide to form a metal sulfide is a zinc ion or an iron ion. (9) The method for removing an odor component according to (7), wherein the odor component-metabolizing microorganism is a microorganism that generates hydrogen sulfide, methyl mercaptan, ethyl mercaptan, propyl mercaptan, or butyl mercaptan by metabolism.

(10) The method for removing an odor component according to (7), wherein the metal ion having a bactericidal action on the odor component metabolizing microorganism is copper ion, silver ion or tin ion. (11) The method according to (7), wherein a metal ion which forms a metal sulfide easily upon contact with hydrogen sulfide or a metal ion having a bactericidal effect on odor component metabolizing microorganisms is added in the form of a metal salt compound. How to remove odor components. (12) The method for removing an odor component according to (7), wherein a metal ion having a bactericidal action on the odor component metabolizing microorganism is added in the form of a nitrate. (13) The addition of the metal ion is performed according to any of the above (1) to (6)
(7) The method for removing an odor component according to the above (7), which is performed by the deodorant according to any one of the above.

[0010]

Embodiments of the present invention will be described below, but the present invention is not limited thereto. The deodorant of the present invention contains a metal ion which easily reacts with hydrogen sulfide to form a metal sulfide. Specific examples include zinc ions and iron ions. These ions may be contained in the form of a metal salt compound that can be easily dissociated by the presence of water (hereinafter, also referred to as a metal sulfide forming compound). Examples of the metal salt compound include a chloride salt and a nitrate.

[0011] Along with such metal sulfide-forming metal ions, metal ions having a bactericidal action are further included. The term "metal ion having a bactericidal effect" refers to a metal ion that reacts with an odor-metabolizing microorganism and exerts an action of inhibiting its biological activity. In this case, the odor component refers to hydrogen sulfide, methyl mercaptan, propyl mercaptan, and butyl mercaptan. (Hereinafter, methyl mercaptan, ethyl mercaptan, propyl mercaptan, and butyl mercaptan may be referred to as “MMs”).
Odorous metabolizing microorganisms include hydrogen sulfide, M in wastewater and sludge.
It refers to microorganisms that generate Ms and the like by living activity.
Specific examples of the metal ion exhibiting the action of inhibiting the activity include metal ions such as copper ion, silver ion, and tin ion. These ions may combine with negative ions such as nitrate ions and have a form of a metal salt compound such as nitrate or chloride. That is, examples thereof include copper nitrate, silver nitrate, tin nitrate, and copper chloride.

As the components other than the metal salt, there is no problem as long as it is a component other than a component which reacts with a metal ion which is an effective component to cause precipitation. Above all, when a fragrance is contained, residual odor can be masked. The above deodorants are
When introduced into organic wastewater such as night soil and wastewater or sludge generated therefrom, the odor component is removed. As odor components to be removed from sewage and sludge, for example, hydrogen sulfide,
Methyl mercaptan, ethyl mercaptan, propyl mercaptan, and butyl mercaptan can be mentioned. The input amount may be calculated, for example, as an addition amount to the sludge slurry after dissolving the active ingredient. The charging method may be performed, for example, by injecting the undiluted solution with a pump or the like at or before the odor location.

FIG. 1 is a graph showing the production rates of hydrogen sulfide (H ₂ S) and MMs generated from wastewater or sludge. Generally, when sewage or sludge is left in an anaerobic state, H ₂ S is generated first, and after a while, MMs are generated. At the points A and B in FIG. 1, a relational expression of H ₂ S≫MMs is established at the concentration. In such a case, when zinc ions or iron ions that react well with H ₂ S are brought into contact with wastewater or sludge, the following reaction occurs, and zinc sulfide or iron sulfide is generated. Sulfide precipitates and hydrogen sulfide is removed. At the same time a small amount of M
Ms are also removed. H ₂ S + Zn ²⁺ → ZnS + 2H ⁺

[0014] The mere addition of zinc ions or iron ions will continue to produce MMs due to the growth of the bacteria, resulting in insufficient odor removal. When metal ions such as copper, silver, and tin coexist in a drug together with a sulfide-forming compound, the biological metabolic function of bacteria that produce MMs and the like stops. Therefore, generation of new H ₂ S and MMs is prevented. In addition,
Even if these bactericidal metals stop the biological metabolic function of bacteria, the metal ions themselves do not undergo a chemical change.
Therefore, its properties are not reduced, and the medicinal effect is continuously maintained for a long period of time.

[0015]

Examples of the present invention will be described below, but the present invention is not limited to these examples. [Examples 1 to 4] [Comparative Example 1] [Reference Example 1 (blank)] Zinc chloride and copper chloride were dissolved in industrial water at the ratios shown in Table 1 below to prepare deodorants. This deodorant was added to sludge so as to have an addition rate of 300 mg / liter.
Mixed sludge was used as the sludge. 4 hours later, and 4
Eight hours later, the concentrations of H ₂ S and MM were examined. The results are shown in Table 1. As a result, it was found that all of Examples 1 to 4 were superior to Comparative Example 1 in both the immediate effect and the sustainability, although the amount of the metal salt used was small.

[0016]

[Table 1]

Examples 5 to 7 Comparative Example 2 Reference Example 2
(Blank)] Example 1 was repeated except that ferrous nitrate, cupric nitrate, silver nitrate and the like were used instead of zinc chloride and copper chloride as shown in Table 2 below.
4, Comparative Example 1 and Reference Example 1.

[0018]

[Table 2]

When metal ions, copper ions and silver ions, which have a bactericidal action on odor-metabolizing microorganisms, are added to a metal which forms a metal sulfide when contacted with hydrogen sulfide such as an iron salt, the odor component is removed for a long time. It was found that it could be suppressed.

[0020]

Industrial Applicability The present invention contains a metal ion which easily forms a metal sulfide upon contact with hydrogen sulfide and a metal ion which has a bactericidal action on odor component metabolizing microorganisms, so that hydrogen sulfide, methyl mercaptan, etc. The organic sewage which emits a bad odor component and the sludge generated therefrom can be effectively and continuously deodorized safely. Specifically, the following effects can be obtained. 1. The deodorizing effect of H ₂ S and MM is excellent. 2. Excellent in both immediate effect and sustainability. 3. The total amount of metal salt used can be reduced as compared with the conventional metal salt method.

[Brief description of the drawings]

Fig. 1 Hydrogen sulfide (H ₂ S) generated from sewage and sludge and MM
It is a graph which shows the production | generation speed of a kind.

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Claims (8)

[Claims] 1. A deodorant comprising a metal ion which easily forms a metal sulfide upon contact with hydrogen sulfide and a metal ion which has a bactericidal action on odor-metabolizing microorganisms. 2. The deodorant according to claim 1, wherein the metal ion which easily contacts with hydrogen sulfide to form a metal sulfide is zinc ion or iron ion. 3. The method according to claim 1, wherein the odor component metabolizing microorganism is hydrogen sulfide,
2. The deodorant according to claim 1, wherein the microorganism is a microorganism which produces methyl mercaptan, ethyl mercaptan, propyl mercaptan or butyl mercaptan by metabolism. 4. The deodorant according to claim 1, wherein the metal ion having a bactericidal action on the odor component metabolizing microorganism is a copper ion, a silver ion or a tin ion. 5. The method according to claim 1, wherein a metal ion which forms a metal sulfide easily upon contact with hydrogen sulfide or a metal ion which has a bactericidal action against microorganisms metabolizing odor components is contained in the form of a metal salt compound. The deodorant described. 6. The deodorant according to claim 1, wherein a metal ion having a bactericidal action on the odor component metabolizing microorganism is contained in the form of a nitrate. 7. Addition of at least a metal ion which easily contacts a hydrogen sulfide to form a metal sulfide and a metal ion which has a bactericidal action on an odor component metabolizing microorganism to waste water or sludge which emits an odor component. Characteristic odor component removal method. 8. The method according to claim 1, wherein the addition of the metal ion is performed.
8. The method for removing odor components according to claim 7, wherein the method is performed by the deodorant according to any one of the above.