JPH02122899A - Deodorizing and deterioration-preventing method of sludge or the like by change into humus therefrom and production of deodorizer and change of properties preventive agent - Google Patents

Abstract

PURPOSE:To effectively perform deodorizing and deterioration-prevention of sludge or the like by adding sulfuric acid adduct of fulvic acid, metallic iron powder and ferrous hydroxide ion to organic sludge or the like and supplying oxygen under aerating agitation and maintaining pH at specified value. CONSTITUTION:Sulfuric acid adduct (<=2.2pH) of fulvic acid, metallic iron powder and ferrous hydroxide ion are added to organic sludge or the like such as sewage sludge, septic tank sludge and industrial organic sludge at the rate of 5wt.%, 1wt.% and >=500ppm respectively. Then the change into humus from sludge or the like is allowed to progress while maintaining pH in a range within 5.8-7.0 and supplying oxygen by aerating agitation. Both deodorizing resulting from active oxygen such as hydroxyl group generated in the meantime and deodorizing resulting from adsorptive bond of a composite structural material produced in the liquid phase are performed. Further propagation stopping and killing of the change of properties-related microorganisms are contrived by maintaining oxidation potential not less than +200mV in both solid and liquid phases.

Description

Detailed Description of the Invention [Industrial Application Field 1] The present invention improves the deodorizing power of the sludge itself by promoting humification of organic I5 sludge such as r-water sludge, human waste septic tank sludge, and industrial organic sludge. A method that can provide two functions to prevent deterioration and deodorize it! 1 and a method for preventing deterioration.

[Conventional technology 1] Conventional deodorization technology often uses cleaning of collected odors, adsorption or cleaning with activated carbon, combined deodorization of activated carbon + spreading agent, etc. as terminal equipment for sewage, human waste, and industrial wastewater facilities, and combustion deodorization. is seen in the role of large-scale MAI, and ozone deodorization methods are also being considered. In many cases, deodorizing of the waste management tank and dewatering equipment is not carried out.In order to prevent the deterioration of mud materials, ;
In addition to killing rice, there are cases where slaked coal is heated to uH11 or higher and 70"C, but an increase in odor is unavoidable.

[Problem to be Solved by the Invention 1] The present invention investigates the problem that conventional deodorizing technology deodorizes by agglomerating the odor generated from sludge, and as for the 11 units of oily and airborne bacteria. Although there are individual H-formulas for killing bodies and parasites, deodorization and trade prevention 11° are technologies that are not related. It is an object of the present invention to provide a method for deodorizing and preventing deterioration by humication, which is characterized by inducing the composition of sludge and can be carried out in the sludge itself, as well as a method for producing a deodorizing and deterioration preventing agent. .

Solve the problem
Sludge dominated by facultative anaerobic bacteria that produce organic acids and generate acidic and neutral odors, and sludge that produces basic decomposition products and is characterized by basic odors. In order to deodorize sludge with a noticeable increase in the #II bacteria group, slow down the progression of deterioration and putrefaction, remove odors, and make sludge desirable including dehydration properties, we first use molded fulvic acid and metal iron powder. Add the material and supply oxygen by aeration and stirring.

This is low-fraction T-fulvic acid (molecular weight less than 1500).
The purpose of this method is to elute high-molecular fulvic acid (No. T-amount 1500 or more) and ferrous hydroxide into the raw sludge and react with organic matter to promote humification.

Regarding the action function of low-molecular-weight fulvic acid, sulfuric acid 1.[As an additive; , is activated and collectively condenses with surrounding organic matter. Normally, the speed is too fast and it is difficult to form a huge structure, but the sugar oxides and glycoproteins that are abundant in raw sludge slow down the collective condensation rate, resulting in a huge complex structure and progressing in humification.

This is because saccharide oxides and glycoproteins + rI preferentially bind to iron ions, ferrous hydroxide, and their polymers, inhibiting their initial binding to fulvic acid.

High-molecular fulvic acid is produced by self-condensation due to the reduction of metallic iron and catalytic action during the production of metallic iron powder moldings, but after elution, it is either fulvic acid iron complex or C) ferrous hydroxide aggregate. Saccharide oxides and glycoproteins that become bound substances and are difficult to aggregate are aggregated, and the aggregates are combined to form sludge. This increases the number of bonding sites in the produced sludge, improving adsorption and dewatering performance.

The optimum pH for humification using fulvic acid described above varies depending on the amount, molecular weight, vI′iL, etc. of the sugars, sugar oxides, or sugars constituting the glycoproteins contained in the raw sludge. 5.8 to 7 in the original class. (), and to maintain this range, the acids derived from the fulvic acid moldings and the alkalis of the polished rice of the metal iron powder moldings:
v49.

However, the adjustment with alkali metals is a reduction in the coagulation of fulvic acid (it does not coagulate up to pH 8.5), and the removal of ζ
This is not desirable because it is difficult.

In addition, the reaction between high and low molecular weight fulvic acids, iron ions, iron hydroxide ions, 1jS1 iron hydroxide polymers, and their combinations with raw sludge and rock material during stirring is , saccharides, saccharide oxides, and lIl groups of the constituent saccharides of the glycoprotein ff1M, and depending on the molecular landscape and structure, the generated giant gaseous structures are divided into liquid and sludge-like structures.

Although the details of the structure of the liquid giant composite structure are unclear, it is possible to absorb and deodorize the acidic, basic, and neutral odors that are polished on the rocky mud, and the liquid itself is odorless. This is a liquid phase derived from raw sludge and has a deodorizing function.

The function of preventing alteration in sludge as the humus ratio progresses is due to the active oxygen (hydrogen peroxide, hydroxyl groups, etc.) generated during the condensation of polymers and fulvic acid and the persistent high oxidation potential of the sludge elements. This is due to the action of

A high oxidation potential occurs when the oxidation of iron in a solid-liquid composite structure becomes one body, and when the oxidation potential becomes +200 mV or more, 3
The valent iron is more than twice that of the divalent iron (Fulvic acid is a monovalent micellar colloid, and has more active groups than the micellar colloid, and it mediates collective condensation. 11: The active groups on the surface 1 of the formed structure are bonded without losing them, but as the structure is oxidized, the structure itself is also oxidized, loses its binding strength, and becomes liberated.

When free low-molecular-weight fulvic acid coexists at 5 ppm or more and ferrous hydroxide ion, which reduces oxidized fulvic acid and acts as an auxiliary agent during collective condensation, coexists at 11) 01+pm or more,
As long as there is a supply of [, group condensation can occur any number of times.

Oxidized type 8! Add 30% of the liquid phase of sludge to the raw γ11 mud, and control the oxygen supply by aeration and stirring to -100 to +5
Maintaining the oxidation voltage in the range of 11+aV is to proliferate and activate activated sludge bacteria such as aerobic bacterial film-forming bacteria and protozoa in the sludge.

In other words, the physiological activity of low molecular weight fulvic acid is 8! This method uses a liquid phase excluding the solid phase with high iron content, lowers the collective condensation ability, limits the generation of active oxygen, and keeps the oxidation potential in the optimal range. By maintaining this, we create an environment that suppresses the growth of microorganisms involved in deterioration, and make the physiologically active effects of low-molecular-weight fulvic acid the main ingredient.

Although the details of the bioactive mechanism of low-molecular-weight fulvic acid are unknown,
It is true that by activating activated sludge bacteria that have been absorbed into microorganisms and whose physiological ability has decreased, their growth ability can be increased. This fact shows that in relation to soil, there are differences in germination, physiology, and yield of both leaf and root vegetables in terms of soil fertility of firewood land, and there are also differences in the size of fish, etc. It has been proven.

The active humus powder used in the present invention has a total fulvic acid content of O
% or more, of which low molecular weight fulvic acid is 2% or more, minerals are 10%, water-soluble lignin is 2% or more, and there is no clay minerals.
It is composed of 20% carbon dioxide and 55% water, and fulvic acid exists mostly in free form, with some of it existing as fulvic acid iron complexes (containing divalent and trivalent iron). In the aqueous extract, fulvic acid and some complexes are eluted, and 7-minic acid is eluted. There is 1 more than V 9 I Example F 12 volumes of activated sludge treatment of water - To the sludge generated ~)0''
ζ, storage'a17 ~ shout) time 1) fl, sour mouth; L and middle ya, one thrust::'t hirko i'j KL and full-bodied composition j
(Fulvic acid 2, S %, metal iron powder molded product 2.5% (total fulvic acid 9 pH (1 (1, beating IQ, emulsified fulvic acid 45 (11 + 11 Io jE Yo U High 5? 'I'
Add 7/L photoacid 45+l p1+μ phase''-1'i), I, 5 +11), 1ljJ at '+1'
i (stirring is performed to advance humusification), and the result is 'C' as shown in 1 below.

1-Eljr obtained: y h c! tl ft!
iQ ifd woIts, 1rJn9 +ko30?5
In addition, 1,51 m” (ventilation at J time -),
1: Adding 3 oq6 of the filtrated sludge to the raw sludge and aerating it was repeated 4 times so that the amount of low molecular weight fulvic acid in TL #l was equivalent to 5 pl + 1. The results were as follows. That's right.

As mentioned above, after adding functional sludge, it is deodorized for 3 (151), but it must be 70 or more before the raw sludge has deodorizing and deterioration prevention functions. C] Even if the amount of liberated fulvic acid decreases, the deodorizing and deterioration prevention functions (one oxide charge does not change within 3 weeks) do not change.

In addition, the material used as raw sludge in "-" is fiif
In both cases, the sludge was dominated by facultative anaerobic particles, which are characterized by the production of organic acids.
From around 0 wheel V to -100mV 1. Shitera oily-
(#lIl bacteria were predominant, and 0 ((almost extinguished, fungal membrane-forming bacteria and protozoa were VJ, which will be discovered later).

precipitation! Using the sludge immediately after sedimentation, 30% of the liquid phase of functional sludge generated at ¥19 return was added, and 1,5
m'/+a' [L-9) through'1 (15 times).The results are shown below. However, during this period, the number of aerobic bacterial film-forming bacteria and ascending protozoa increased compared to the control non-additive sludge.This sludge was added to raw sewage by 40%, and (IO
After 8 hours, better results were obtained in terms of sedimentation of the internal particles and clarity of the liquid phase than in the Gessho area.

[Effect of the invention 1 The method of the present invention, which humicizes the original iF element to provide deodorizing and quality prevention functions, is natural since it is a process of rotten formation in nature, and can be used in the environmental purification cycle. This is the basic type.

From immediately after activated sludge generation to organic sludge that is undergoing alteration, return sludge should be treated with the same organic substance removal rate as raw water, and sludge for deodorization should be treated with Deodorizing 8! For sludge whose purpose is to prevent deterioration, 8! There is no other example of this, as it provides the ability to perform with the same basic operation.

In addition, the dewatering property and dehydrated sludge are not only odorless, but also have an easy-to-use aggregate structure with clay minerals, so they are easy to store, transport, and use later.
The impact on the working environment, social environment, and natural environment is significant.

Claims (1)

[Scope of Claims] 1. A sulfuric acid adduct of fulvic acid (pH 2.2 or less), metallic iron powder, and ferrous hydroxide ions are used in organic sludges such as sewage sludge, human waste septic tank sludge, and industrial organic sludge. , each 0
．． By adding 5%, 1%, and 500 ppm or more and proceeding with humification of the sludge while maintaining the pH in the range of 5.8 to 7.0 under the supply of oxygen through aeration and stirring, Odor reduction by active oxygen such as hydroxyl groups and hydrogen peroxide, deodorization by adsorption bonding of composite structures generated in the liquid phase, and growth of microorganisms involved in deterioration by maintaining an oxidation potential of +200 mV or more in both the solid and liquid phases. 1. A method for deodorizing and preventing deterioration of sludge through humification, which is characterized by deodorizing and preventing deterioration of sludge by using the sludge itself. 2. Add sulfuric acid adducts of fulvic acid (pH 2.2 or less), metallic iron powder, and ferrous hydroxide ions to organic sludges such as sewage sludge, human waste septic tank sludge, and industrial organic sludge.
．． By adding 5%, 1%, and 500 ppm or more and proceeding with the humification of the sludge while maintaining the pH in the range of 5.8 to 7.0 under the supply of oxygen through aeration and stirring, the sludge can be humicized for a long period of +200 mV or more. The oxidation potential of the functional sludge was maintained to produce functional sludge with deodorizing power and deterioration prevention power, and 30% of the functional sludge was added to the above raw sludge and released into the liquid phase of the functional sludge under the supply of oxygen through aeration and stirring. Low molecular weight fulvic acid (
With a molecular weight of 1500 or less), a deodorizing composite structure, and a solid phase with enhanced adsorption power, deodorization and humification progress with the organic matter of the raw sludge, producing sludge of the same quality as the functional sludge added again. , deodorizing sludge by humication, which is characterized by being able to repeat the cycle of changing raw sludge into homogeneous sludge with the sludge produced by humication, and inheriting deodorizing power and deterioration prevention function five or more times. How to prevent deterioration. 3. Low molecular weight fulvic acid (molecular weight 1500 or less), sulfuric acid adduct (pH 2.2 or less), metallic iron (100 mesh or less) and ferrous hydroxide ions are added to sewage sludge, human waste sludge, industrial organic sludge, etc. 0.5% and 1% for sludge, respectively
Sludge with deodorizing and deterioration prevention functions is produced by adding 500 ppm or more of sludge and humicizing the sludge while maintaining the pH in the range of 5.8 to 7.0 under the supply of oxygen through aeration and stirring. or sludge of the same quality as the added functional sludge obtained by adding 30% of the above functional sludge to the above raw sludge and supplying oxygen by aeration agitation,
When adding 30% of the liquid phase such as functional sludge obtained by repeating the above cycle to sludge such as sewage sludge, human waste septic tank sludge, and industrial organic sludge, and proceeding with humusation under the supply of oxygen through aeration and agitation. In addition, the amount of oxygen supplied through aeration is adjusted to maintain the oxidation potential of both the solid and liquid phases in the range of -100 to +50 mV while humification is promoted, deodorizing and the growth of aerobic bacterial membrane-forming bacteria and protozoa. A method for deodorizing and preventing deterioration of sludge through humification, which is characterized by deodorizing and suppressing the growth of facultative anaerobic and anaerobic microorganisms by adjusting the oxidation potential. 4. Add sulfuric acid to activated humus powder (pH 3.0 or less) to make the pH 2.2 or less, adjust the moisture content to 50-70%, and then add approximately 3Kg/c while maintaining the temperature rise to 60℃ or less.
Pressure molded into pellets, spheres, plates, honeycomb shapes, etc. at a pressure of m^2, and then heated at an external temperature of 3 to 25% with a moisture content of 35 to 25%.
Continue drying at 0°C or below to reduce the percentage to 15% or less, pressurize the coexisting humic acid, humic substances, lignin, and clay minerals.
Deodorization of sludge through humification, which is characterized by forming an insoluble molded product with a strong humic structure through drying, eluting low-molecular-weight fulvic acid (molecular weight 1500 or less) and sulfuric acid adducts, and having the role of lowering the pH of sludge. and a method for producing a molded product of fulvic acid, which is an anti-deterioration agent. 5. Metallic iron powder (100 mesh or less) and moisture content of 50
1:1 to active humus powder adjusted to a range of ~70%
After mixing at a ratio of 2.5:1, the mixture is pressure-molded into pellets, spheres, plates, or honeycomb shapes at a pressure of about 3 kg/cm^2 or more while maintaining the temperature rise below 75°C.
By drying to a moisture content of 15% or less at an external temperature of Below) Ferrous hydroxide necessary for supplying iron ions to the sulfuric acid adduct, coagulating and turning original sludge suspended particles into sludge, increasing the oxidation potential of both the solid and liquid phases, and improving the humus structure strength of the molded product structure. A method for producing an agent for deodorizing sludge and preventing alteration by humicification, which is characterized by supplying ions.