JPH0810778A - Method for deodorizing and purifying sewage and sludge by humic iron-oxygen composite - Google Patents

Abstract

PURPOSE:To inexpensively solve odor removal and to reduce treated sludge to soil by adding an enzyme humic iron-oxygen composite to the sewage derived from living things or excrement, such as sewer water and night soil, and the sludge formed by a biological treatment of the sewage and subjecting the sewage or the sludge to an oxidation treatment by ventilation. CONSTITUTION:The enzyme humic iron-oxygen composite is added to the sewage or the sludge and is subjected to ventilated stirring at about 3m<3> per minute in the case of treatment of the sewage or the sludge formed by the biological treatment of the sewage. The sewage or the sludge is subjected to the oxidation treatment by using >=20% freshly formed sludge at need. The enzyme humic iron-oxygen composite is formed by kneading enzyme humic powder, bivalent iron salts powder and iron-component respectively at <=80%, >=20% and >=2% or are dried within 25% moisture at <=180 deg.C after kneading. The content of the enzyme humic iron-oxygen composite is increased and the amt. thereof to be used is specified to >=1/10000 of the sewage and >=1/1000 of the sludge.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention uses an enzyme humus iron-oxygen complex for deodorization and purification by adjusting the concentration of sewage in activated sludge treatment of sewage derived from living things or the excrement, or during sludge conditioning. It is about how to do it.

[0002]

2. Description of the Related Art The deficiency of odor control, which is one of the deficiencies of the activated sludge method which has been continued, remains unsolved at present. Countermeasures against spoilage and rotten odors while a large amount of sludge is being transferred to the dehydrator are in control. Deodorization is carried out with fatty acid alkoxy radicals generated from fatty acids, divalent iron and hydrogen peroxide, but the odor of peroxides of fatty acids remains, and the chain reaction also terminates quickly due to the reaction between radicals in the radical chain reaction. . Also humus powder,
In the example of reacting the humus extract with divalent iron salts in sewage or sludge, the amount of humus iron complex produced was small and the amount of humus oxygen complex produced was small, resulting in poor deodorization and purification effects.

[0003]

SUMMARY OF THE INVENTION According to the present invention, water and produced sludge treated so as not to generate an odor are accepted as useful for the natural environment and are reduced, so that they do not become industrial waste. Is the first purpose. A second object is to use a small amount, to deodorize and purify a large amount of sewage and sludge, and to lower the cost.

[0004]

The method of deodorizing and purifying sewage and sludge using the humus iron oxygen complex of the present invention is an organic substance complex containing 10% or more in enzyme humus (corresponding to fulvic acid in the analytical classification). All of the above) is a divalent iron complex, and a humus iron (divalent) oxygen complex is prepared by adding reduced oxygen to the complex, and the characteristics possessed by the complex are exhibited in sewage and sludge.

Unlike simple divalent iron, the complex of enzyme humus and divalent iron salts undergoes autooxidation with hydrogen peroxide generated by self-bonding or cross-linking with other organic substances,
Generates active oxygen such as hydroxy radicals. However, if it is oxidized to be no reduced iron, all binding and oxidation reactions will be stopped.

In the present invention, reduced oxygen (singlet oxygen) is added to the enzyme humic iron (divalent) complex in advance to form an enzyme humic iron (divalent) oxygen complex. Radicals are automatically generated by chain reaction. Therefore, the oxidative deodorizing ability and the purifying ability are also maintained.

Generation of hydroxy radicals in sewage and sludge containing powder or pellets containing enzyme humic iron (divalent) oxygen complex is persistent but its generation rate is moderate, so that the generation of hydroxyl radicals is low. There is little production and no peroxide odor. Oxidation potential of sewage and sludge is -100 to +200
Since it can be maintained at mv for a long period of time, it suppresses the growth of microbial groups involved in spoilage and decay and promotes the growth of good quality microbial groups. It makes it easier to produce treated water and compost that is willing to be accepted by the natural environment, and none of it becomes industrial waste.

The enzyme humus iron oxygen complex in the present invention is kneaded by coexisting iron powder when the enzyme humus iron complex is prepared. The molecular oxygen in the humus and the oxygen entrained in the kneading are reduced to singlet oxygen, which is added to the enzyme humus iron complex to form the enzyme humus iron oxygen complex, which also has a large impact on the manufacturing cost. First, it is not necessary to add a material that becomes industrial waste.

The amount of enzyme humus iron oxygen complex used is
More than two-thousandth of 100,000 for kneaded and dried material, two-thousandth for sludge
With the above, if the kneaded mixture is used as it is, the above-mentioned amount is used twice or more. When using sludge in which generation of hydroxy radicals proceeds in a chain instead of the enzyme humus iron complex, 20% of raw water or sludge is added and stirred. Repeated addition of regenerated sludge to new wastewater and sludge at the same rate gives 5
It can be done more than once. Therefore, the amount used is 1/5 or less as compared with the enzyme humus iron complex.

The enzam humus used in the present invention is derived from the neutral humus that has been buried in the ground by condensing the leaves of deciduous trees and decomposed products of animal origin under a warm climate. It is made into powder after being molecularized, recombined and stabilized. pH is less than 2.6,
The oxidation potential is +500 mV or more, and 10% or more of an organic compound complex (corresponding to fulvic acid in the analytical classification) is contained in a stable state as a free and iron complex. The organic compound has a molecular weight of 2000 or more, 1000 to 2000
And the content of 1000 or less is 6: 3: 1.

[0011]

EXAMPLES Examples of the present invention will be described below. Table 1
Examples of water quality after dilution process in biological waste treatment process and biological treatment. In contrast to the conventional method of diluting human waste discharged from a sand basin 10 times with tap water, in the present invention, 2 / 100,000 enzyme humus iron oxygen complex is added and then aerated at 0.3 m ³ / day for 15 minutes. Then, after standing for 1 hour, the supernatant is transferred to an aeration tank.
In the concentration tank, 2 / 10,000 of the enzyme humus iron oxygen complex was added to the amount of sludge, and the mixture was aerated and agitated at a rate of 0.3 m ³ per minute per night, and then returned to the aeration tank at 20% for 8 hours. The water quality is the result of aeration at 0.3 m ^{3 /} min.

[0012]

[Table 1]

The removal rate of the oxidation treatment performed without dilution was 9
The removal rate was 5% or less, the removal rate was the same in the subsequent biological treatment, and no difference was observed even when the amount of enzyme humus added was 1/5. The odor of the sewage treatment plant decreased so much that it was hardly felt after the oxidization treatment, and it was the same before and after the biological treatment and during the dehydration with the running filter cloth. Moreover, even if the amount of enzyme humus added was 1/5, there was a difference. I was not able to admit.

Table 2 is an example of treating sewage. This is the result of addition to the concentration tank in this treatment. 0 minutes per minute for 2 days.
It is the water quality after aeration of 3 m ³ and activation of sludge, followed by aeration treatment as usual by returning 20% of sludge. The BOD removal rate was 97%, which was a good result as compared with the conventional method of 82%. 1/5 for Enzyme Humic Iron Complex
There was no big difference in the amount used. The odor of the enrichment tank decreased with the passage of aeration after the addition of the enzyme humic iron-oxygen complex.

[0015]

[Table 2]

[0016]

INDUSTRIAL APPLICABILITY The present invention not only solves the odor countermeasure during the transfer of human waste and sewage sludge by a simple, reliable and inexpensive treatment method, but also provides a means for returning the treated sludge to the soil in a valuable form. In that respect, the effect is great.

Claims (3)

[Claims] 1. Enzyme humus iron-oxygen complex is added to sewage, wastewater derived from living things such as human waste or the excrement, and sludge produced by biological treatment of sewage, and aeration of 3 m ³ per minute is provided. A method for deodorizing and purifying sewage and sludge using a humic iron-oxygen complex, which is characterized by performing an oxidation treatment. 2. A sewage derived from organisms such as sewage and human waste, or sewage derived from the excrement concerned, and sludge produced by biological treatment of sewage, an enzyme humus iron-oxygen complex is added and aeration-stirred to newly generate A method of deodorizing and purifying sewage, sludge using a humus iron-oxygen complex, characterized in that an oxidation treatment is performed using 20% or more of the sludge thus made. 3. An enzyme humus iron oxygen complex to be added to sludge produced by biological treatment of organisms such as sewage, human waste, or such excrement, and sludge produced by biological treatment of sewage is an enzyme humus powder and divalent iron. 80% or less of each of salt powder and iron powder:
20% or more: Muddy at 2% or more, or after kneading,
Enzyme humus iron-oxygen complex (Enzyme humus +2
Content of (valent iron + reduced oxygen) has been increased in advance, and the humus iron-oxygen complex is characterized by using more than 1/10000 of sewage and more than one-thousandth of sludge. Deodorization and purification method for sewage and sludge.