JPH0299185A - Water treatment agent and water treatment process - Google Patents

Abstract

PURPOSE:To increase aggregation rate of nondissolving substances to make it easier to determine the amount of additives by combining soluble aluminium salts or soluble iron salts, carbonates of alkali metals, and separation agents, of predetermined quantity respectively, to prepare water treatment agents. CONSTITUTION:At least one kind of soluble aluminium salts or soluble iron salts, carbonates of alkali salts, and separation agents, of predetermined quantity respectively, are combined to prepare water treatment agents. The water treatment agents thus prepared are thrown into a liquid to be treated, whereby the liquid is agitated to effect aggregation of suspended solids therein, while effecting decolorization and desalting of the liquid. As a separation agent, at least one kind of agent selected from (a) calcium compounds or at least one kind of calcium compounds, (b) burned ash of coal or slag of blast furnace, and (c) solubilizing agents such as mirabilite etc., or nonsolubilizing agents such as pulverized pagodite etc., is preferable.

Description

[Detailed Description of the Invention] [Field of Industrial Application] This invention relates to a water treatment agent and a water treatment method17, in particular,
The present invention relates to water treatment agents and water treatment methods that can be used in all fields, such as flocculants, dehydrating agents, decolorizing agents, and desalting agents.

[Conventional technology and its issues]

Large amounts of organic or inorganic undissolved substances contained in civil engineering wastewater, sewage water, or industrial wastewater become floating substances in water and are disposed of in rivers or the sea, causing pollution. Therefore, recently, the above-mentioned civil engineering waste liquid and the like are treated to reduce the concentration of suspended matter in the water to below a standard level before being disposed of, but the time and expense required for this treatment are enormous.

For example, titanium oxide, a pigment used in paper mills to smooth the surface of paper, takes a very long time to recover, resulting in increased product costs. Furthermore, since the water from rivers and lakes used as water sources contains a large amount of the above-mentioned undissolved substances, it is supplied as tap water after being treated at a great deal of time and expense. Furthermore, there is an ever-increasing demand for measures to deal with floating matter in ponds, which occur during seabed dredging, and to deal with red tide in oceans and lakes.

Also, treat water containing the above-mentioned suspended matter (e.g. sewage treatment)
In this case, suspended matter in the water is once aggregated and sent to a centrifuge,
After being dehydrated, if necessary, it is solidified and disposed of. Also, if it contains organic matter, it will cause a pollution problem if it is disposed of unnecessarily, so it is first incinerated and the incinerated ash is disposed of. In some cases.

Various flocculants have been developed for use in the flocculation process. For example, inorganic systems include aluminum salts (aluminum sulfate, ammonium alum, potassium alum, sodium aluminate, polyaluminum chloride), iron salts (ferrous chloride, ferric chloride, ferrous sulfate, ferric sulfate, polysulfuric acid). For organic systems (ferric iron, etc.), low-molecular salts, surfactants, natural or synthetic polymers, etc. have been developed and used.

Inorganic flocculants generally have excellent adsorption and collection power, so
Although the supernatant liquid after use has good transparency and water can be easily separated from the precipitate, it has a slow aggregation rate and is generally an acidic substance, so an alkaline neutralizing agent such as slaked lime or soda is required after treatment. It was necessary to neutralize the water by adding ash and caustic soda. Organic flocculants are generally expensive, and furthermore, the flocs (each particle of the precipitate formed when a flocculant is mixed) are lower than when an inorganic flocculant is used. Although it is larger, it has inferior adsorption and collection power, leaving the supernatant turbid, and other problems.
The problem is that the precipitate becomes sticky and sticky, making it difficult to separate water from the floc using a centrifuge or the like.

Therefore, at present, when necessary, an inorganic flocculant is mixed with an organic flocculant.

In addition, the above-mentioned flocculants are not versatile, and the type of flocculant used is limited depending on the properties of the liquid to be treated.
Further, the amount to be added is determined depending on the properties of the agent to be treated, and there is a problem in that if the amount is outside of that amount, there is no aggregation effect.

Furthermore, there are cases where a sufficient flocculating effect cannot be obtained simply by using the above-mentioned inorganic or organic flocculants, and in this case, bentonite, cement dust, and fly ash (coal incineration ash) may be used as flocculant aids. etc. are used before using the above-mentioned flocculant, but this work in addition to adding the flocculant is extremely troublesome.

Next, in order to efficiently dewater sewage sludge, it is common practice to use a dehydrating agent. However, as this dehydrating agent, a special organic chemical has conventionally been used, which is extremely expensive and causes an increase in sewage treatment costs.

In addition, conventional flocculants had almost no decolorizing effect on dye wastewater, and it was hoped that a suitable treatment agent would be developed. Furthermore, wastewater with a high salt concentration, such as wastewater from pickle factories, is also a problem because there is currently no suitable treatment for it.

[Means to solve the problem]

This invention has been proposed in view of the above-mentioned conventional circumstances, and aims to provide a water treatment agent and a water treatment method that are inexpensive, have a fast agglomeration rate, and are easy to determine the amount to be added. . Another object of the present invention is to provide a water treatment agent and a water treatment method that exhibit a high dehydration effect even when used as a dehydration agent when dewatering sewage sludge or the like. In addition, this invention
The purpose of the present invention is to provide a water treatment agent and a water treatment method that also exhibit a decolorizing effect on dye wastewater. A further object of the present invention is to provide a water treatment agent and method that also has the effect of desalinating high salt concentration wastewater.

In order to achieve the above object, the present invention employs the following means. In other words, ■ soluble aluminum salt or soluble iron salt and ■ alkali metal carbonate are the main raw materials, and if necessary, ■ the following (al, (bl, (
(a) At least one type of calcium compound or substance whose composition is calcium (b) Coal incineration ash or blast furnace slag (c1 Glauber's salt, etc.) A soluble agent or a non-soluble agent such as loite.As the soluble aluminum salt, aluminum sulfate, ammonium alum, potassium alum, sodium aluminate, polyaluminum chloride, etc. can be used, and as the iron salt, primary chloride can be used. iron, ferric chloride,
Ferrous sulfate, ferric sulfate, polyferric sulfate, etc. can be used.

Further, as the alkali metal carbonate, sodium carbonate, sodium bicarbonate, sodium sesquicarbonate, potassium carbonate, etc. can be used.

In this invention, if a calcium compound or a substance composed of calcium is added as necessary, the aggregation effect can be improved.
It can enhance the dehydration effect, desalination effect, and decolorization effect.

The above two substances are typical acids and alkalis, and the calcium compound is used as a sequestering agent during storage and as a reaction moderator during reaction. As the calcium compound, lime R (slaked lime, quicklime), gypsum (dihydrate gypsum, hemihydrate gypsum, anhydrite), cement (Portland cement alumina cement), lucium carbonate, etc. can be used.

In this invention, the flocculation effect can be enhanced by adding coal incineration ash (fly ash) instead of or in addition to the above-mentioned lucium compound. Cross-linking effect of fly ash (irregularly shaped fly ash intertwines with each other,
This is because the effect of sinking the flocs formed by the aluminum salt etc. occurs. It is also possible to use blast furnace slag in place of flyanche. Since blast furnace slag has the above-mentioned crosslinking effect and also contains a calcium compound, it can enhance the coagulation effect.

In the present invention, Glauber's salt can be added as a sequestering agent in place of or in addition to the above-mentioned lucium compound, fly ash, etc. The above-mentioned compounds have low solubility and remain in the flocs, but mirabilite has high solubility and does not remain in the flocs, so if the flocs contain substances to be recovered, they can be easily recovered and reprocessed. Become.

The blending ratio of each of the above substances can be considered based on the following criteria. The liquid to be treated is neutral and contains a reaction moderator (
When a neutral substance such as gypsum, rhusium carbonate, fly ash, or mirabilite is used as a sequestering agent, the ratio of soluble aluminum salt (iron salt) to alkali metal carbonate is stoichiometrically neutral. The proportion becomes . For example, aluminum sulfate (purity 58.7) is used as a soluble aluminum salt.
If sodium carbonate is used as the alkali metal carbonate, it may be blended in an amount (weight ratio) of approximately 5 parts aluminum sulfate to 3 parts sodium carbonate or 3 parts aluminum sulfate to 2 parts aluminum carbonate. However, even if the ratio slightly deviates from this ratio, the object of the present invention can be sufficiently achieved. When cement is used as the calcium compound, reduce the amount of alkali metal carbonate (or increase the amount of aluminum salt) according to the amount of cement.

When the liquid to be treated is acidic, the amount of alkali metal carbonate or cement is increased, and when the liquid to be treated is alkaline, the amount of alkali metal carbonate or cement is decreased. However, even when this alkali metal carbonate is not used, sufficient coagulation, dehydration, and other effects can be achieved.

Separating agents such as the above-mentioned lucium compounds account for 7% of all water treatment agents.
0% or less is added. If the amount exceeds this amount, the effects of coagulating, dehydrating, desalting, and decolorizing sulfates etc. will be weakened. The amount of sequestering agent may be zero, but in this case the reaction tends to be too rapid.

The amount of the water treatment agent according to the present invention added to the liquid to be treated varies depending on the concentration of the liquid to be treated. Naturally, the higher the concentration of suspended matter in the liquid to be treated, the greater the amount added.

In this invention, it is believed that the alkali metal carbonate promotes the decomposition of soluble aluminum salts (iron salts) and enhances its effectiveness as a flocculant, dehydrating agent, desalting agent, and decoloring agent. Therefore, in this invention, the soluble aluminum salt (iron salt) and the alkali metal carbonate are added almost simultaneously (this also includes the case where the next drug is injected while the activity of the previously injected drug remains). It is meaningful only when it is added to the liquid to be treated. For example, if a soluble aluminum salt is mixed into the treated agent first, and then an alkali metal carbonate is added after its activity has disappeared, the alkali metal carbonate will still function as a conventional neutralizing agent, but will still coagulate. No promoting effect appears. When a reaction moderator such as a calcium compound is used, the calcium compound is added immediately before the aluminum salt (iron salt) and the alkali metal carbonate, or immediately after at least one of them is added.

That is, the reaction moderator must form a situation in which it acts on aluminum salts (iron salts) or carbonates of alkali metals while they are active. The following organic water treatment agents (
The same applies to the case where a flocculant) is used.

In the present invention, not only inorganic raw materials are used as described above, but also an organic water treatment agent (flocculant) can be mixed in addition to the above-mentioned inorganic raw materials. Organic water treatment agents include anionic, cationic, nonionic, etc., and at least one of each is used depending on the properties of the liquid to be treated. The amount of this organic water treatment agent added varies depending on the liquid to be treated, but it is necessary to add 0.1% by weight or more to the inorganic water treatment agent of the present invention. As the amount of organic water treatment agent added increases, the defects of conventional organic water treatment agents become more obvious, and the upper limit varies depending on the nature of the liquid to be treated. It can be added up to 90% by weight.

When an organic water treatment agent is added in this way, the flocculation effect is stronger than that of a water treatment agent composed only of inorganic raw materials, and if only organic water treatment agents are used. The transparency of the supernatant liquid becomes greater than when
When used as a dehydrating, decolorizing, or desalting agent, the effect is greater than when only inorganic or only organic agents are used.

〔Example〕

The aluminum sulfate used in the Examples shown in Tables 1 to 20 below has a purity of 58.7%.

Table 1 shows submarine sludge diluted liquid (approximately 100 ppm) 125
The effects of applying this invention to g are expressed as upper, middle, lower, upper: good result, ◎ is particularly good, slightly worse than second-upper, lower: slightly worse than medium. Mixed water treatment agent (flocculant)
The amount is about 0.1% by weight of the liquid to be treated.

The symbols used in Table 1 are defined below.

In the following definitions, the numbers represent the mixing ratio (% by weight).

(1) Y: Slaked lime 70. X30 (X is defined in (3))
+2) AY: Cement 60. Slaked lime20. X20
(4) Bread sulfur: Aluminum sulfate Also, when two or more raw materials are expressed as being added together in the table [for example, ■ to [phase]], the same amounts of each are added in the table.

As is clear from this table, Agent X, which uses 60% by weight of aluminum sulfate and 40% by weight of sodium carbonate, shows the most excellent effect. It can also be seen that a sufficiently large effect can be obtained even when slaked lime, gypsum, cement, rhusium carbonate, Glauber's salt, etc. are added to the X agent. Also ■
As is clear from a comparative study of and @, in the case of (2), there is too much aluminum sulfate, which deviates from the above-mentioned ideal ratio with sodium carbonate, and the effect is reduced in such a case.

First, a water treatment agent having the formulation as shown in Table 2 was prepared, and Table 3 shows the results of applying it to a diluted mud solution collected from an estuary and a diluted titanium oxide solution used in the paper manufacturing process. Both mud diluted liquid and titanium oxide diluted liquid are 1100pp.
The concentration of the treated liquid was 120 g, and the mixed water treatment agent was 0.08% by weight. For comparison, a flocculation test was conducted using only aluminum sulfate, but it took about 24 hours for the mud to settle and the transparency of the supernatant was not sufficient. There was almost no aggregation of titanium oxide.

Tables 4 (A) and (B) show the aggregation rates when the additive amounts of Agents B and M shown in Table 2 were varied. The liquid to be treated is a 1100 pp mud diluted liquid. As is clear from this table, it is sufficient that the addition rate is 0.1% by weight or less of the liquid to be treated, and it can be seen that the larger the addition amount, the faster the aggregation rate. Further, as shown in Table 4, the aggregation rate of agent B is faster than agent M, but this is thought to be due to the difference in the fly ash content of agent B. That is, it is considered that the crosslinking effect of fly ash is at work. In Tables 3 and 4 (the same applies to Table 5 below), "Habo settling time" means the time for the flocs to settle almost completely.

Second notation ratio (1) Sulfur bread: Aluminum sulfate Soda ash: Soda carbonate charcoal Calcium carbonate
This figure shows the flocculation effect when adding % by weight (1% by weight of the total amount of inorganic water treatment agents) of an organic water treatment agent (flocculant) (nonionic). Each water treatment agent (flocculant) shows a 20 to 30% faster flocculation rate than the case shown in Figure 3, which indicates the magnitude of the effect of the combination with an organic water treatment agent (flocculant). can.

Next, Table 6 (A) shows the results of a beaker test of the present invention on food factory wastewater (rice washing wastewater) conducted by the Chiba Office of Environmental Management Center Co., Ltd. The water treatment agent is agent B in Table 2,
The amount added was 0.4 g/l, and lppm of an organic polymer water treatment agent (flocculant 5S500) was added. In the table, BOD is biochemical oxygen demand, COD is chemical oxygen demand, SS
is the amount of suspended solids, and for BOD and COD, JIS
-0102-21), and SS was measured according to Appendix Table 6 of Environment Agency Notification No. 59 of 1971 (the same applies to Table 6 B below).

Table 6 (A) Table 6 (B) shows the results of a beaker test of the present invention on food factory wastewater (pickle wastewater) by Gunma Environmental Giken Co., Ltd. The water treatment agent is agent M shown in Table 2, and the amount added is 2 g/I.
! It is.

Table 6 (B) Next, further examples are added to prove the effect when used as a flocculant. First, the symbols used in the following examples are defined as follows.

B agent: See Table 2 M2 agent: 〃 P agent: 〃 (11 agent 201) agent: (2) agent: B (2) agent: Company A anionic polymer flocculant Company A cationic polymer system It is a mixed flocculant of flocculant B agent and (2) agent, and the mixing ratio is expressed by a hyphen and a number.

That is, when indicated as B (21-1), 1% by weight of agent (2) is added to agent B;
-1 means that 2% by weight of agent (2) is added.

M2 (A mixed coagulant of agent 21, agent 2, and agent (2); the addition ratio of agent (2) is indicated with a hyphen and a number as above.

P (2) agent: A mixed flocculant of P agent and (2) agent, and the addition ratio of (2) agent is indicated with a hyphen and a number as above.

[Settling property of bentonite]

Bentonite is well known for its resistance to settling;
The disposal method at construction sites, etc. has become a major problem. Therefore, 0.5% by weight bentonite aqueous solution (TS=
50001) pm), no additive or a predetermined amount of a polymeric water treatment agent (flocculant) or agent B was added and stirred, and the height of the sedimentation interface after a predetermined time was observed (screening test). The results are shown in Table 7.

Next, ■Polymer water treatment agent (flocculant) only, ■B agent only,
■Sedimentation properties were tested in three cases: 1st stage treatment in which agent B was added first and stirred, and then a polymer flocculant was added and stirred in 2nd stage treatment. . The results are shown in Table 8.

Furthermore, in cases where a polymer flocculant was added to agent B, and when agent B was used alone, agent B was added to the test liquid and stirred.
The height of the sedimentation interface was compared in three cases where a polymer flocculant was added and stirred after [first stage treatment] [second stage treatment].

The results are shown in Table 9.

Bentonite particles in Table 1 are difficult to settle, and if they are precipitated using only a polymeric a collector, the sedimentation rate is high, but the supernatant does not have sufficient clarity. However, the above table [Tables 7 to 9]
As is clear from the table, the use of the water treatment agent according to the present invention has a remarkable effect on sedimentation. Examining Table 7, it can be seen that with agent B alone, the compactness of the sedimentation is slightly inferior, but the remaining amount of suspended matter is very small, and a clear supernatant liquid can be obtained. In addition, the flocculation method in which a polymer flocculant is added after addition of agent B has a considerable effect as far as Table 8 is considered, but as can be seen from Table 9, the inorganic water treatment agent of the present invention It is also effective to add a predetermined amount of a polymer flocculant in advance.

[Test on stone wastewater]

Stone wastewater generated at stone crushing plants is well known for its suspended solids that are difficult to settle.

Therefore, 2000 ppm, pH 7.3, light transmittance 51
A predetermined amount of the present water treatment agent was added to 150 m4 of stone wastewater, and the results are shown in Table 10 below.

As is clear from this table, it can be seen that the suspended solids have almost completely settled.

No. table 'rX, Jinj'4: Ba, Ai.

Medium length.

The longest j song becomes better [Dewatering property for sewage sludge] Next, as an example to prove that the water treatment agent of the present invention can be used as a dehydrating agent, a dehydration test was conducted for a sewage sludge cake.

As a dewatering system for sewage sludge, a belt press dewatering system using an organic polymer dehydrating agent has become popular.
The amount of sludge with poor dewatering properties is increasing, and the peelability of the dewatered cake from the filter cloth is worsening, which is a problem in terms of maintenance and management of the dehydrator. One of the reasons for this is the dehydrating agent for organic polymers. Organic polymer dehydrating agents are also disadvantageous in that they are expensive.

Therefore, using the present invention, tests were conducted to find out whether more efficient dehydration could be performed while taking advantage of the advantages of an organic polymer dehydrating agent, and whether good releasability could be obtained.

The sludges used in the test were I and ■ shown in Table 11.

■It is.

Table 1 1 above 1. First, a predetermined amount of agent B was added to the sludge of II, m, and a flocculation reaction was performed by stirring (hereinafter referred to as pretreatment).After that, a predetermined amount of an organic polymer dehydrating agent was added to cause a flocculation reaction.

The results are shown in Tables 12 and 13.

As is clear from Table 12, when the dehydrating agent of the present invention is used, the amount of gravity filtration in 5 seconds becomes incomparably larger, and the effect is particularly remarkable when the amount of agent B added is 3% to 5%, and the dehydrating property is improved. It proves that In addition, the releasability (the cake peels off from the upper and lower cloths after pressure filtration) is also improved, but in this case as well, the effect begins to be seen when the amount of agent B added is 3% or more, but when the amount of agent B is 5% or more, The effect becomes more pronounced.

Furthermore, the moisture content of the cake after pressure dehydration was reduced by about 1%, and from this point as well, improvement in dehydration performance can be expected.

Table 13■? Table 12 of the sludge section ■ Sludge Q cutting is different from the lungs at Yue, and another related to dehydration. As a test example, the above Mz,
G 3. The results are shown when a GT agent and a cationic polymer dehydrating agent are used together.

Each figure in Table 14 also shows the amount of polymer flocculant added to the dry weight of each sludge.

The broken lines in each of the above figures indicate the water content of the dehydrated cake when no dehydrating agent is added. Therefore, if the value is lower than this line, it means that it is effective as a dehydrating agent.

Examining the above three figures, it can be seen that in each case, the water content is significantly reduced by adding about 10% of the inorganic water treatment agent to the dry weight %.

The results are shown in FIGS. 1, 2, and 3. Regarding the amount and time of addition of the inorganic and polymeric dehydrating agents of the present application, there are the following cases, and the symbols thereof are shown in the drawings.

Case ■ Both added: The inorganic water treatment agent of the present invention is added after gravity dehydration. Treatment of high-salinity wastewater. The flocculant of the present invention is added to high-salt wastewater with properties as shown in Table 15 below to determine its flocculating ability. It was confirmed.

Table 15 Properties of samples Add and stir.

The results of this test are shown in Table 16. As is clear from this table, when only an organic flocculant was used, flocs could not be formed, but it can be seen that good results can be obtained by performing the above two-stage treatment. In particular, with N005, sedimentary flocs were generated, which could be removed by filtration and SS could be eliminated.

The concentration of evaporation residue in the supernatant of the treated solution was 16.2%, so 3.6% of the soluble substances formed flocs and were removed from the 19.8% supernatant of the additive-free stock solution. There is. In addition, even if the treatment is performed only with the inorganic flocculant of the present application without performing the above two-step treatment (No. 2.3, 7, 8.1)
0) Shows acceptable results.

150mJ of high salt content wastewater with the above properties in a 200m1 beaker! First, predetermined amounts of inorganic flocculants B, P, M, and G according to the present invention were added in Table 17 [Decolorization of dye-colored wastewater] Reactive dye (black) manufactured by Company A 0.01% (100 ppm) was added to 200 mj2 50 m I in a beaker! Add a predetermined amount of flocculant B(2)-2 and stir (450 rpm).
60 seconds). After stirring, a filter paper is set in a funnel and the flocculated liquid is filtered naturally, the light transmittance T of the obtained filtrate is measured, and the decolorization rate is determined by the following formula.

TO: 1 ogT without additives To 0: -1ogT after treatment T: Transmittance The results are shown in Table 17.

Black reactive dyes are particularly difficult to decolor, and conventional flocculants can
The decolorization rate is less than 0%. As is clear from Table 17, when the flocculant of the present invention is used, a decolorization rate of 80% or more is exhibited.

(Agglomeration test of polluted tap water) An experiment was conducted to remove the red turbidity that occurred in the water supply of a certain city.The water treatment agent used was 55% aluminum sulfate.
, sodium carbonate 30% by weight, cement 1-10% by weight,
Calcium carbonate is 5% by weight.

Take raw water 11 in 11 beakers and use a jar tester to measure 35
Orpm stirring was performed, and after a predetermined amount of flocculant was added, stirring was continued for 60 seconds.

For decantation, after stopping stirring, the stirring blade was pulled up, and after standing still for 1 hour, the clarified liquid was taken into a sample container. Also,
For graduated cylinder decantation, after stopping stirring,
The total amount of liquid is 17! The mixture was transferred to a graduated cylinder, kept at rest for 3 hours, and the supernatant liquid was filtered through Toyo Roshi Na5A, and then collected in a sample container.

The results of the above experiments are shown in Table 18. In Table 18, when the water treatment agent according to the present invention was used and graduated cylinder decantation was performed (cases 7, 8, and 9) cleared the standard values in all respects. I can understand. In addition, Table 19 (2) of Table 19 (2) of Table 19 (2) of the present invention Table +: Many losses are used, and the water treatment agent according to Table 1 raw water COO 256 pprn is used, and the normal 1 jl! When decanting in a beaker (Ilh5, fish 6)
It can be seen that it has a considerable effect on

[Aggregation treatment of titanium oxide suspension]

Table 19 (1) below shows the results of an experiment in which a suspension of titanium oxide used for paper manufacturing was precipitated. Drugs BO1BK, MO, MK using titanium oxide concentration of 0.5%
The details are shown in Table 19 (2).

As is clear from Table 19 (1), 2000 to 3000 pp of the treatment agent of the present invention containing only 1% of polymer flocculant was added.
It can be seen that titanium oxide, which is difficult to agglomerate with ordinary water treatment agents, coagulates in 20 to 40 seconds just by using m.

[Paper mill wastewater treatment]

SS350ppm, pH6.5, hue/brown, C0D2
Table 20 shows the results of treating No. 56 paper mill wastewater by adding 1 ppl of a polymeric water treatment agent to the water treatment agents BO, BK, and MO2MK shown in Table 19 (2) above. The second
As is clear from Table 0, the water treatment agent according to the present invention is
Great effects have been obtained with an addition amount of about 000 pp.

In addition, when using polyaluminum chloride, in order to obtain the same effect as when using an MK agent, 500 ppm is required.
When considering the cost, it can be seen that the present invention is superior to the present invention.

〔Effect of the invention〕

As mentioned above, this invention uses soluble aluminum salt (iron salt) and alkali metal carbonate as its main ingredients, and if necessary, adds a calcium compound or the like to rapidly bring out the coagulation effect of aluminum sulfate. This has the effect of greatly increasing the aggregation rate. In addition, the amount added is not limited by the type or concentration of the liquid to be treated, and a large aggregation effect occurs, and the aggregation rate increases according to the amount added, so the work to determine the amount to be added is extremely easy. . Furthermore, if the formulation is determined according to the pH state of the liquid to be treated, no neutralizing agent is required at all. In addition, since the aggregation speed is high, it is possible to save space in equipment and equipment. Furthermore, in addition to the above-mentioned aggregation effect, when used as a dehydrating agent, it also exhibits a dehydrating effect. Furthermore, it has a desalting effect and a decolorizing effect, and can be applied to all types of water treatment.

Not only can the above effects be further enhanced by using a conventionally used polymer flocculant, but also the amount of the polymer flocculant used can be significantly reduced.
There will be cost benefits in sewage treatment, etc.

[Brief explanation of drawings]

FIG. 1, FIG. 2, and FIG. 3 show experimental results when the water treatment agent according to the present invention was used as a dehydrating agent. 1st Figure-Dan Mi” (translated by the descendant Flo 0I0) Figure vE slight change fD (01,) Figure lid porcelain? 1 Elderly 170 rate ('/,)

Claims (1)

[Scope of Claims] (1) Water treatment comprising [1] At least one of soluble aluminum salts or soluble iron salts [2] Any amount of alkali metal carbonate [3] Any amount of sequestering agent (2) The water treatment agent according to claim 1, wherein at least one organic water treatment agent is added to the inorganic agent (3) above, wherein the isolating agent (a) contains a calcium compound or a calcium compound. The water treatment according to claim 1 or 2, comprising at least one of the following substances: (b) coal incineration ash or blast furnace slag; and (c) at least one of a soluble agent such as mirabilite or a non-solubilized agent such as fine rock powder. Agent (4) The following three types of chemicals are administered to the liquid to be treated almost simultaneously and stirred to cause agglomeration, decolorization, and/or
A water treatment method characterized by desalination [1] At least one of soluble aluminum salts or soluble iron salts [2] Any amount of alkali metal carbonate [3] Any amount of reaction moderator ( 5) In addition to the three inorganic chemicals, at least one of the organic water treatment agents is added at the same time as the inorganic chemicals are administered to the liquid to be treated, or at any time before or after the inorganic chemicals are administered to the liquid to be treated. (6) A water treatment method according to Claims 4 and 5, wherein a mechanical dehydration treatment is further carried out after the above treatment (7) The reaction moderating agent comprises: (a) a calcium compound or a calcium compound; Claims 4, 5 and 6, comprising at least one of the following substances: (b) coal incineration ash or blast furnace slag; and (c) at least one of a soluble agent such as mirabilite or a non-soluble agent such as fine rock powder. Water treatment method described