JP3727303B2 - Inorganic sludge reforming coagulation purification agent - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a sludge agglomeration separation and purification agent for inorganic polluted wastewater and organic polluted wastewater, and simultaneously adsorbs polluted substances and suspended suspended substances due to metals (including heavy metals) dissolved in the polluted wastewater, or While sorbing and aggregating and separating, the properties of the agglomerated sludge can be improved and separated as a very stable solid without re-elution of metals (including heavy metals). That is, while purifying the polluted wastewater to an excellent water quality, it is possible to separate the pollutant as a highly stable and agglomerated sludge rich in hydrophobicity, and the dehydrated sludge is dissolved again in water and does not collapse, The present invention relates to a novel inorganic sludge reforming and coagulating purification agent of a polluted wastewater purification treatment agent having a function of reforming to a mud that approximates natural soil over time.
[0002]
[Prior art]
In the treatment of inorganic and organic polluted wastewater, conventionally, an inorganic or organic flocculant is added to agglomerate and separate suspended suspended solids in the polluted wastewater, and the treated water is adjusted to meet the prescribed water quality standards ( For example, pH adjustment, decolorization, etc.) are discharged, and the separated sludge is dehydrated and, if necessary, insolubilized with heavy metals and discarded.
[0003]
In either inorganic or organic flocculants used for the treatment of polluted wastewater, the main purpose is to efficiently agglomerate suspended solids in the polluted wastewater.
Therefore, although some of the metals (including heavy metals) dissolved in the polluted wastewater are separated in a state of being taken up by the suspended suspended solids, they are positive for the conventional flocculant itself. Since it does not have the function of fixing metals (including heavy metals), elution is unavoidable when it is dumped. That is, another method is required for the non-eluting treatment of metals (including heavy metals).
[0004]
Furthermore, the water content is high in both cases of coagulated and separated sludge by inorganic or organic coagulant used for the treatment of contaminated wastewater, and sludge after dehydration.
Further, it is generally easy to redissolve in water, and if discarded, it causes a large amount of soil contamination and causes new environmental pollution.
[0005]
Sludge that has been coagulated and separated with inorganic or organic flocculants used in polluted wastewater treatment is dehydrated, but is incinerated for volume reduction.
Dioxins, which are considered extremely harmful in the exhaust gas generated during incineration, and unstable heavy metals remaining in the incineration ash and fly ash newly cause environmental pollution, and an urgent countermeasure method is required. It has been.
[0006]
[Problems to be solved by the invention]
It is an object of the present invention to provide a novel powdery sludge reforming flocculation separation / purification agent that can solve various problems as described above in the treatment of conventional inorganic and organic polluted wastewater.
Specifically, even if the polluted wastewater (whether inorganic or organic) is acidic or alkaline (in the range of hydrogen ion concentration PH4 to 9), the pollutant (including dissolved substances) can be collected very quickly. Clean and neutral separation water is obtained by physical and chemical flocculation, and the sludge that has been flocculated and separated is reformed to a very stable substance, rich in dehydration, and metals (heavy metals) Are stable chemically and biologically, and a stable, hardly soluble sludge can be obtained. Further, the coagulated sludge and the dehydrated sludge become insoluble in water, and the sludge is modified to a property approximate to the soil by microorganisms.
In addition, harmful gases of dioxins generated during incineration of dewatered sludge are suppressed by the synergistic effect of the inorganic components mixed with the reduced moisture content of the dehydrated sludge, and unstable gases remaining in the incinerated ash and fly ash. Heavy metals are also solidified and fixed chemically.
[0007]
The above and other objects and novel features of the present invention will become more fully apparent when the following description is read in conjunction with the accompanying drawings.
However, the drawings are for explanation only and do not limit the technical scope of the present invention.
[0008]
[Means for Solving the Problems]
In order to achieve the above object, the present invention is based on diatomaceous earth mixed with soil fungi, 10 to 30 parts by weight of activated carbon, 20 to 50 parts by weight of cement, and 100 parts by weight of a main component containing 2 to 5 parts by weight of organic flocculant. 10 to 20 parts by weight of sodium thiosulfate, 10 to 20 parts by weight of iron oxide, 30 to 60 parts by weight of calcium sulfate, 20 to 50 parts by weight of aluminum sulfate, and 10 to 20 parts by weight of alkali metal carbonate with respect to parts Thus, an inorganic sludge modifying flocculant is constituted.
[0009]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, the present invention will be described in detail with reference to embodiments shown in the drawings.
[0010]
In the first embodiment of the present invention shown in FIGS. 1 and 2, reference numeral 1 denotes an inorganic sludge reforming and coagulating purification agent for treating inorganic polluted wastewater and organic polluted wastewater. Agent 1 is composed of 10 to 30 parts by weight of activated carbon 4, 20 to 50 parts by weight of cement 5, and 2 to 5 parts by weight of organic flocculant 6 for diatomaceous earth 3 in which soil fungus 2 is blended. 10 to 20 parts by weight of sodium thiosulfate 8, 10 to 20 parts by weight of iron oxide 9, and 30 to 60 parts by weight of calcium sulfate so that the total weight is 20 to 30 parts by weight with respect to 100 parts by weight. Parts, 20 to 50 parts by weight of aluminum sulfate 11 and 10 to 20 parts by weight of alkali metal carbonate 12 are uniformly mixed.
[0011]
As the diatomaceous earth 3, one kind or a mixture of two kinds of freshwater diatomaceous earth or marine diatomaceous earth is selected. Diatomaceous earth 3 has an excellent function as a filter medium and the adsorption of fats and oils, and these natural minerals contain various mineral trace elements (mineral components).
This trace element elutes in the polluted waste water over time, reacts synergistically with dissolved oxygen and dissociated acid ions in the polluted waste water, and reduces or oxidizes and separates organic pollutants (including dissolved substances). It has the function of separating and purifying as a hydrophobic coagulum.
In addition, these natural minerals exhibit their functions effectively in the range of the hydrogen ion concentration PH4 to 9 (acidic region, neutral region, alkaline region) of the polluted wastewater.
[0012]
As the soil fungus 2, Bacillus subtilis Bacillus, Pseudomonas fungus Pseudomonas, and their modified fungi were selected. These are representative soil fungi, and they have the ability to decompose oils and fats, decompose pollutants (including inorganic compounds, organic compounds, etc.), make them soil, and make them harmless over the long term. . It also contributes to a reduction in the quality of treated water.
[0013]
The activated carbon 4 and the cement 5 and the organic flocculant 6 are not particularly limited. The activated carbon 4 is a fine powder of 100 mesh or less, and its purpose is to remove organic substances, odors, colors, etc. using its adsorption ability.
The cement is selected from Portland cement (ordinary, early strength, very early strength, moderate heat, sulfate-resistant), blast furnace cement, fly ash cement, and alumina cement. The purpose is to add functions such as adsorption of harmful substances and aggregation and solidification by hydration reaction.
As for the organic flocculant 6, 1.2 wt% of the suspended suspended solids in the polluted wastewater is normally used as a standard amount. However, the inorganic sludge-modified flocculant purifying agent 1 of the present invention is substantially organic flocculant. The amount of the agent is about one-tenth that of the organic flocculant used alone, and the same effect can be obtained. There is an advantage that can reduce the amount of organic flocculant.
In addition, the inorganic sludge reforming and coagulating purification agent 1 of the present invention is added to the polluted wastewater as a powder, and the former reaction, that is, the decomposition of the pollutant and the sludge reforming function are given priority, and the latter reaction, that is, the aggregation and solidification reaction A time difference is set in.
The blended organic coagulant 6 gradually dissolves during the previous reaction, coagulates and separates the modified sludge and solidifies.
[0014]
The sodium thiosulfate 8 reacts positively with heavy metals to form an insoluble metal thiosulfate compound. The mixing ratio of sodium thiosulfate 8 can be adjusted according to the value of heavy metals in the pollutant.
[0015]
The iron oxide 9 (specifically Vegara) has the purpose of providing a synergistic effect as a catalyst in each reaction such as aggregation and reforming of pollutants.
[0016]
The calcium sulfate 10 is dispersed and suspended in the polluted waste water, and a part thereof is dissolved. It functions as a neutralizer for the free acid produced by the dissociation of aluminum sulfate 11 described later, and at the same time contributes as an agglomeration and solidification reaction aid.
[0017]
The aluminum sulfate 11 is easily dissolved in the contaminated waste water, hydrolyzed and dissociated into aluminum sulfate 11 and sulfuric acid.
Aluminum oxide is further converted to polycondensed aluminum hydroxide consisting of colloidal aluminum hydroxide and ionized aluminum hydroxide.
This polycondensed aluminum hydroxide lowers the potential between the particles of the suspended suspension in the polluted waste water. Therefore, the balance between the particles of the pollutant is broken down into fine particles, and these fine particles are newly agglomerated by performing functions such as mineralization of organic metals, ion adsorption of metals (including heavy metals), and fixation. And separate.
[0018]
The alkali metal carbonate 12 is also easily dissolved in the polluted waste water and contributes to neutralization of free acid and agglomeration reaction.
Examples of the alkali metal carbonate 12 include sodium carbonate, calcium carbonate, magnesium carbonate, and dolomite.
[0019]
The inorganic sludge modified flocculating and purifying agent 1 having the above-described structure comprises a natural mineral (powder) impregnated with microorganisms (soil fungi), an inorganic compound (both powders), and a small amount of an organic flocculating agent (powder). It is characterized by being blended and configured in a predetermined ratio.
[0020]
The conditions for use of the inorganic sludge modified agglomerated purification agent 1 having the above-described configuration are as follows:
(1) A predetermined amount is added as a powder.
(2) Strong mixing is desirable to make mixing agitation after addition and designed reaction (decomposition, sludge modification, fixation, aggregation, separation, etc.) more effective.
(3) The standard addition amount is 5 wt% t of the pollutant in the polluted waste water.
[0021]
The agglomeration reaction of the inorganic sludge reforming aggregating and purifying agent 1 having the above-described configuration is extremely fast, and the agglomerated sludge is further solidified and separated by stirring.
Aggregated and separated sludge is a hydrophobic and extremely stable sludge and does not collapse or re-dissolve.
In addition, the dewatering property of the coagulated and separated sludge is high, the odor of the dewatered sludge is reduced, the sludge is modified to a sludge that is close to natural soil, the elution of metals (including heavy metals) does not occur, and the residual organic matter in the sludge is spoiled Etc. are also suppressed by soil fungi and become naturally humus over time.
[0022]
Different Embodiments of the Invention
Next, different embodiments of the present invention shown in FIGS. 3 and 4 will be described. In the description of the different embodiments of the present invention, the same components as those in the first embodiment of the present invention are denoted by the same reference numerals, and redundant description is omitted.
[0023]
The second embodiment of the present invention shown in FIGS. 3 and 4 is mainly different from the first embodiment of the present invention in that sodium thiosulfate 8 is added to 100 parts by weight of the main component 7. 10-20 parts by weight, 10-20 parts by weight of iron oxide 9, 30-60 parts by weight of calcium sulfate 10, 10-50 parts by weight of aluminum sulfate 11, and 10-20 parts by weight of alkali metal carbonate 12 In addition, at least three or more types may be uniformly blended, and thus the inorganic sludge modified aggregating and purifying agent 1A configured as described above may be used.
[0024]
[Experimental example]
(1) Adjustment of inorganic sludge modifying flocculation and purification agent / adjustment of main components: Diatomite 3 is selected from Radiolite # 800, and the culture solution of soil fungus 2 is pre-watered and impregnated therein, and then dried. .
The mixing ratio is 10 parts by weight of activated carbon 4 (100 mesh or less), 20 parts by weight of ordinary Portland cement, and 3 parts by weight of polymer flocculant (+) with respect to 100 parts by weight of diatomaceous earth 3 and these are mixed uniformly. .
Adjustment of essential components: The blending ratio is 10 to 20 parts by weight of sodium thiosulfate 8 with respect to 100 parts by weight of the main component 7, 10 parts by weight of iron oxide 9, 35 parts by weight of calcium sulfate 10, and aluminum sulfate 11 Was 40 parts by weight and calcium carbonate 12 was 15 parts by weight.
Predetermined amounts were respectively taken and mixed so as to be uniform to prepare the inorganic sludge reforming flocculating and purifying agent of the present invention.
(2) As an object, data based on inorganic or organic flocculants generally used at present is adopted.
1. The result of the purification test of the primary treated water of the sewage treatment plant is shown in FIG. 5, and the result of the dewatering test of the concentrated sludge is shown in FIG.
2. The result of the purification test of the effluent from the human waste treatment plant is shown in FIG.
3. The result of pretreatment of livestock (pig) manure is shown in FIG.
4). Industrial wastewater: Fig. 9 shows the results of a water purification test for wastewater from a paper mill.
5. Mine drainage: The results of the drainage and sludge heavy metal fixation treatment are shown in FIG.
[0025]
【The invention's effect】
As is clear from the above description, the present invention has the following effects.
[0026]
(1) 10 to 30 parts by weight of activated carbon, 20 to 50 parts by weight of cement and 2 to 5 parts by weight of organic flocculant for 100 parts by weight of sodium thiosulfate ~ 20 parts by weight, iron oxide 10-20 parts by weight, calcium sulfate 30-60 parts by weight, aluminum sulfate 20-50 parts by weight, alkali metal carbonate 10-20 parts by weight, so inorganic pollution Even if wastewater or organic polluted wastewater is acidic or alkaline (hydrogen ion concentration range of PH4-9), pollutants (including dissolved substances) are aggregated and separated very quickly and cleanly. Sexual separation water is obtained.
In addition, the coagulated and separated sludge is reformed to a very stable substance and is highly dehydrated. Furthermore, metals (including heavy metals) are fixed chemically and biologically, and are stable and hardly soluble. Sludge is obtained.
[0027]
(2) According to the above (1), the coagulated sludge and the dewatered sludge become hardly soluble in water, and the sludge can be modified to a property approximate to the soil by microorganisms.
[0028]
(3) By the above (1), the harmful gas of dioxins generated during the incineration of dewatered sludge is also suppressed by the reduced moisture content of the dehydrated sludge and the synergistic effect of the blended inorganic components. Unstable heavy metals remaining inside can also be chemically solidified and fixed.
[0029]
(4) Claims 2 to 7 can provide the same effects as the above (1) to (3).
[Brief description of the drawings]
FIG. 1 is an explanatory diagram of main components of a first embodiment of the present invention.
FIG. 2 is an explanatory diagram of the first embodiment of the present invention.
FIG. 3 is an explanatory diagram of main components of a second embodiment of the present invention.
FIG. 4 is an explanatory diagram of a second embodiment of the present invention.
FIG. 5 is a diagram showing a purification test result of primary treated water in a sewage treatment plant using an inorganic sludge modified flocculating and purifying agent.
FIG. 6 is a graph showing the results of a dewatering test of concentrated sludge in a sewage treatment plant using an inorganic sludge modifying agglomerated purification agent.
FIG. 7 is a view showing the purification test result of the effluent from the excreta treatment plant using the inorganic sludge modified agglomerated purification agent.
FIG. 8 is a view showing the results of a pretreatment test of livestock (pig) manure with an inorganic sludge-modified flocculant cleaner.
FIG. 9 is a view showing the results of a water purification test of paper mill effluent using an inorganic sludge-modified coagulant cleaner.
FIG. 10 is a diagram showing the result of a mine drainage purification and heavy metal fixation test using an inorganic sludge reforming coagulation purification agent.
[Explanation of symbols]
1, 1A: Inorganic sludge reforming agglomeration purification agent,
2: soil fungus, 3: diatomaceous earth,
4: Activated carbon, 5: Cement,
6: Organic flocculant, 7: Main component,
8: Sodium thiosulfate, 9: Iron oxide,
10: calcium sulfate, 11: aluminum sulfate,
12: Alkali metal carbonate.

Claims (7)

  10 to 20 parts by weight of sodium thiosulfate with respect to 100 parts by weight of the main component containing 10 to 30 parts by weight of activated carbon, 20 to 50 parts by weight of cement, and 2 to 5 parts by weight of organic flocculant to diatomaceous earth with soil fungus Part, iron oxide 10-20 parts by weight, calcium sulfate 30-60 parts by weight, aluminum sulfate 20-50 parts by weight, alkali metal carbonate 10-20 parts by weight, inorganic sludge Modified flocculating and purifying agent.   The inorganic sludge-modified coagulant cleaner according to claim 1, wherein the diatomaceous earth is either freshwater diatomaceous earth or marine diatomaceous earth or both.   Activated carbon is a fine powder of 100 mesh or less, The inorganic type sludge reforming coagulation purification agent according to any one of claims 1 and 2.   The inorganic sludge according to any one of claims 1, 2, and 3, wherein the cement is any one of various Portland cements, blast furnace cements, fly ash cements, alumina cements, or a mixture thereof. Modified flocculating and purifying agent.   The inorganic system according to any one of claims 1, 2, 3, and 4, wherein the soil fungi are Bacillus subtilis, Bacillus (Bacillus bacteria), Pseudomonas (Pseudomonas), and any of these modified fungi. Sludge reforming coagulation purification agent.   The total weight of sodium thiosulfate, iron oxide, calcium sulfate, aluminum sulfate, and alkali metal carbonate is a distribution ratio of 20 to 30 parts by weight with respect to 100 parts by weight of the main component. An inorganic sludge modifying agglomerated purification agent according to claim 1.   The inorganic sludge reforming and coagulating purification agent according to any one of claims 1 to 6, wherein the alkali metal carbonate is at least one selected from the group consisting of sodium carbonate, calcium carbonate, magnesium carbonate and dolomide.

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