CN112601595A - Complex coagulant and drainage treatment system using complex coagulant - Google Patents
Complex coagulant and drainage treatment system using complex coagulant Download PDFInfo
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- CN112601595A CN112601595A CN201980055706.9A CN201980055706A CN112601595A CN 112601595 A CN112601595 A CN 112601595A CN 201980055706 A CN201980055706 A CN 201980055706A CN 112601595 A CN112601595 A CN 112601595A
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- water
- coagulant
- carbide
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D21/00—Separation of suspended solid particles from liquids by sedimentation
- B01D21/01—Separation of suspended solid particles from liquids by sedimentation using flocculating agents
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/52—Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/52—Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities
- C02F1/54—Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities using organic material
- C02F1/56—Macromolecular compounds
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- Hydrology & Water Resources (AREA)
- Engineering & Computer Science (AREA)
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- Chemical Kinetics & Catalysis (AREA)
- Separation Of Suspended Particles By Flocculating Agents (AREA)
Abstract
A filtrate sample obtained by adding a complex flocculant composed of a carbide flocculant and a water-soluble polymer flocculant to target water to coagulate the water and filtering the coagulated liquid through a 600-mesh stainless steel sieve was subjected to COD test, and the results of COD test were found to be 74ppm for the target water and 22 to 26ppm for the filtrate coagulated with the carbide flocculant and the water-soluble polymer flocculant. The drainage (sewage) is first precipitated with solid matter in the precipitation tank 31, and then introduced into the bubble generation tank 32, before and after which the composite flocculant of the present invention, that is, the carbide flocculant and the water-soluble polymer flocculant, are added to the drainage. Then, the supernatant is introduced into the coagulation tank 33, then into the aerobic treatment tank 34, and finally into the final precipitation tank 35.
Description
Technical Field
The present invention relates to a complex coagulant and a drainage treatment system using the same.
Background
Generally, a wastewater treatment system for treating wastewater containing a raw material biomass having a high water content such as sewage and livestock excrement includes an aerobic treatment step. The coagulation step of adding a coagulant is provided before or after the treatment step. The energy load of the aerobic treatment step can be reduced by providing the coagulation step before the aerobic treatment step.
The flocculant is usually a complex flocculant obtained by adding a small amount of a water-soluble polymer flocculant to an inorganic flocculant such as polyaluminum chloride (PAC), aluminum sulfate (aluminum sulfate), or ferric polysulfate (III). However, since the discharge of the inorganic coagulant into the environment is harmful, a harmless coagulant is desired. In this case, it is desirable to use a material derived from a biomass or a carbide that can contribute to reduction of carbon dioxide.
The 1 st conventional flocculant is a single activated carbide flocculant produced by activation treatment (see patent document 1).
The conventional flocculant of the 2 nd publication is a single carbide flocculant produced without being subjected to an activation treatment (see patent document 2). The carbide coagulant is produced at a lower cost than the active carbide coagulant.
Documents of the prior art
Patent document
Patent document 1: japanese patent laid-open publication No. 2010-75809
Patent document 2: international publication WO2015/019382
Disclosure of Invention
Technical problem to be solved by the invention
However, the conventional single active carbide coagulant has a weak coagulation effect. That is, paragraph 0028 of patent document 1 describes below.
"to confirm the effect of the present invention, the following experiment was performed with respect to SS (suspended matter). 2 settling cylinders made of vinyl chloride having an inner diameter of 5.8cm and a height of 120cm were prepared. Water collecting cocks are installed at positions 50cm and 100cm from the upper part of this settling cylinder (water collecting point). Since the solid matter concentration of the target water is at most about 300mg/l, it is not necessary to consider the wall surface effect. As the sewage, influent sewage of 5 samples in total, which was collected from the K treatment plant (2 samples) and the T treatment plant (3 samples), was used. A constant amount (2L, height: about 97cm) of these samples was put into a settling tank, and the active carbide was put into the tank and stirred up and down, and measured as the start of settling from the point of standing. At each water sampling point, 40ml was sampled at regular intervals, and SS analysis was performed according to the launching test method. As a result, the removal rate of SS was found to be 60 to 80%. "
Therefore, the conventional single active carbide flocculant has a coagulation effect based on slow sedimentation accompanying coagulation of a small amount of active carbide, and has a problem that the coagulation effect is weak because it does not have a coagulation effect based on a large amount of active carbide to form large flocs and has a large sedimentation rate.
< Experimental example 1>
A sample (COD was determined by simple COD detection to be in the range of 120 to 200ppm) prepared by diluting 5 times the concentrated sludge discharged from the final sedimentation tank of a facility for treating drainage from agricultural villages in Mingyu area, West City, Ichcity, 400ml and 0.08g of carbide (manufactured by Shichuan Mingyu and Industrial Co., Ltd., raw material: rice hull, carbonization temperature 800 ℃ and particle size 250 to 600 μm (pulverized with a mortar and classified with a stainless steel sieve)) were put into a 500ml beaker and stirred at 700rpm for 5 minutes. No agglomeration was observed in the beaker. Thereafter, 300ml samples were transferred to 300ml graduated cylinders. The stirring completion time when the stirring was completed and the mixture was transferred to the measuring cylinder and the aggregation state in the measuring cylinder at the time when 8 minutes and 30 seconds passed thereafter are shown in fig. 3 (a) and (B).
Therefore, according to the above experimental example 1, the coagulation effect of the conventional single carbide coagulant is based on the slow sedimentation occurring with the coagulation of a small amount of active carbide, and there is a problem that the coagulation effect having a large sedimentation rate is not based on the formation of large flocs by a large amount of active carbide, and the coagulation effect is weak.
< Experimental example 2>
190cc of initial sedimentation tank inflow water collected at the kanagawa water regeneration center in kanagawa county was put into 2 200cc beakers, and 0.03g of a single activated carbon flocculant (diameter 250 μm or less) and a single carbide flocculant (carbon) (800 ℃, rice husk, diameter 250 μm or less) used in IHI Shibaura (ISM) water purification devices (IHI technical report, vol.51, No.4, 107(2011)) manufactured by industries (ltd.) were added thereto, and the mixture was stirred with a stirring rod, and then transferred to a 300ml measuring cylinder, and then allowed to stand, and the state was photographed after 26 minutes. Fig. 4 (a) shows a state of a conventional single activated carbon flocculant, and fig. 4 (B) shows a state of a conventional single carbide flocculant (carbon). Neither of them has coagulation phenomenon, and there is no difference in settling velocity. The concentrations of activated carbon and carbon were about 150 ppm.
Therefore, according to the above experimental example 2, it was confirmed that the conventional single active carbide flocculant and the conventional single carbide flocculant do not have an flocculation effect of forming large flocs and having a large settling rate, and the flocculation effect is weak.
Means for solving the problems
In order to solve the above problems, the complex coagulant of the present invention is a complex coagulant containing a carbide coagulant and a water-soluble polymer coagulant. The complex coagulant of the present invention does not contain an inorganic coagulant.
The wastewater treatment system of the present invention is a system including a bubble generation tank for generating microbubbles, nanobubbles, or microbubble-nanobubbles in the treated water and a coagulation tank for coagulating the target water discharged from the bubble generation tank, wherein the complex coagulant is added to the target water. The complex coagulant may be added to the coagulation bath instead of the bubble generation bath.
ADVANTAGEOUS EFFECTS OF INVENTION
According to the present invention, it is considered that the water-soluble polymer flocculant acts as a fixing agent for the carbide flocculant, and the carbide flocculant forms larger flocs. As a result, the large-sized flocs have a large settling velocity, and thus a strong flocculation effect can be obtained.
Drawings
Fig. 1 is a block diagram showing embodiment 1 of a wastewater treatment system using the complex flocculant of the present invention.
Fig. 2 is a block diagram showing embodiment 2 of a wastewater treatment system using the complex flocculant of the present invention.
FIG. 3 is a photograph showing the state of aggregation of a conventional single carbide coagulant, wherein (A) shows the state at the end of stirring, and (B) shows the state after the elapse of 8 minutes and 30 seconds.
Fig. 4 is a photograph showing the state of aggregation after 20 minutes has elapsed after completion of stirring, where (a) shows the state of a conventional single activated carbide aggregating agent, and (B) shows the state of a conventional single carbide aggregating agent (char).
Examples
Example 1 of the complex flocculant of the present invention will be described.
< Environment >
Room temperature: 24 deg.C
< carbide flocculating agent >
As the carbide coagulant A, B, C, D, a carbon produced in a carbonization furnace manufactured by Minghua, Industrial Co., Ltd. (Jinze, Shichuan prefecture) was prepared.
Carbide coagulant a: fine rice hulls with diameter of 250 μm or less obtained by externally carbonizing at 800 deg.C and classifying with stainless steel sieve
Carbide coagulant B: fine rice hulls with diameter of 250 μm or less obtained by externally carbonizing at 400 deg.C and classifying with stainless steel sieve
Carbide coagulant C: fine substance with diameter of 250 μm or less obtained by externally carbonizing cedar wood chips at 800 deg.C and classifying with stainless steel sieve
Carbide coagulant D: fine product with diameter of 250 μm or less obtained by externally carbonizing cedar wood chips at 400 deg.C and classifying with stainless steel sieve
< Water-soluble Polymer coagulant >
As a water-soluble polymer flocculant, HB-3045 available from Annicon K.K. was prepared.
< Water of interest >
The initial settling pond, which prepared the kanagawa water reclamation center, was influent.
< implementation conditions >
The experiments were carried out under the following experimental conditions for the carbide coagulant A, B, C, D and the water-soluble polymer coagulant.
Amount of subject water: 300cc
Stirring rotation speed: 500rpm (from 10 minutes to 200rpm at the end)
Total stirring time: 15 minutes
0.05g (166 ppm) of each carbide coagulant A, B, C, D was added to 300cc of target water in a beaker, and after 3 minutes from the start of stirring with an electric stirrer, 0.0064g (22 pm) of each 1 drop (10 drops: 0.16g, 1 drop: 0.016g, 40% pure) of water-soluble polymer coagulant was added. Thereafter, stirring was carried out for 12 minutes.
< results of implementation >
A complex flocculant composed of carbide flocculants A to D and a water-soluble polymer flocculant was added, and the sludge was filtered through a 600 mesh (mesh diameter: 250 μm) stainless steel sieve with the water to be stirred, and a filtrate sample was subjected to COD detection by Osumi (Kabushiki Co., Ltd.), and the following results were obtained.
Only subject water: 74ppm of
Filtrate containing carbide coagulant a and water-soluble polymer coagulant: 26ppm of
Filtrate containing carbide coagulant B and water-soluble polymer coagulant: 26ppm of
Filtrate containing carbide coagulant C and water-soluble polymer coagulant: 24ppm of
Filtrate containing carbide coagulant D and water-soluble polymer coagulant: 22ppm of
Thus, the COD removal rate was 60% or more.
Next, example 2 of the complex flocculant of the present invention will be described.
< Condition >
Room temperature: 21 ℃, indoor humidity: 77% (TANITA, TT-509)
< carbide flocculating agent >
As the carbide coagulant, charcoal "char eight" of yun charcoal co was prepared. About 10.7g of carbon fine powder was pulverized by a pulverizer, and classified by a stainless steel sieve, and the classification was as follows.
125μm-90μm：3.1g
125 μm or more: 7.6g
90 μm or less: none.
< Water-soluble Polymer coagulant >
As the water-soluble polymer flocculant, an amphoteric polymer HB8043 (40% emulsion) produced by annikang was diluted 400 times (0.4/400 ═ 1/1000) and 0.1% (1000ppm) to prepare a solution.
< Water of interest >
As the target water, 320g of polished rice (name: polished rice, raw brown rice: single raw rice (manufactured by Qianye county, Fusaotome), seller: Hill, Kabushiki Kaisha) was added to 1 liter of tap water, and stirred by hand to prepare rice-washing water.
< implementation conditions >
Target amount: 1000cc
Stirring rotation speed: scale of mixer 1(LAB. STIRRER, MS3040, Max.3000rpm, AC100W)
Total stirring time: 5 minutes (elapsed time after addition of amphoteric Polymer)
Before the start of stirring, 0.2g of charcoal (200 ppm) was added to 1000cc of the target water, and 30 seconds after the start of stirring, 20ml of an amphoteric polymer (20 pm) was added. Thereafter, the mixture was stirred for 5 minutes.
< results of implementation >
The COD (MAX.250ppm) of the raw water was about 150ppm (room temperature: 24 ℃ C., elapsed time: 4 minutes 36 seconds) as a result of a simple test. In addition, the COD simple test result after filtering the flocculated sludge with a 250 μm stainless steel sieve was 40 ppm. Namely, the COD removal rate was 60% or more.
Thus, the conventional single activated carbon flocculant and the conventional single carbide flocculant do not cause a strong flocculation action with a large settling rate to form large flocs even if they are used alone to coagulate. On the other hand, in examples 1 and 2 of the present invention, a strong flocculation effect of forming large flocs was obtained, and particularly, in the above experimental results, the COD removal rate was 60% or more.
In the above-described embodiment, the carbide flocculating agent is a carbide flocculating agent produced without being subjected to an activation treatment, but may be an activated carbide flocculating agent produced by being subjected to an activation treatment.
The water-soluble polymer flocculant may be a water-soluble polymer derived from natural sources, such as chitosan. Further, the water-soluble polymer flocculant may be a modified water-soluble polymer flocculant into which at least 1 kind of a cationic unit, an anionic unit, a nonionic unit, an amphoteric unit, and a hydrophobic unit is introduced. Further, the water-soluble polymer coagulant may be at least 1 of modified cellulose nanofibers, modified cellulose nanocrystals, modified chitin nanofibers, modified chitin nanocrystals, modified chitosan nanofibers, and modified chitosan nanocrystals.
A conventional flocculant such as a commercially available inorganic flocculant パルクリーン (trademark of CAS chemical Co., Ltd.) may be added to the complex flocculant of the present invention as an auxiliary agent for carbon in an amount of about 10%. For example, about 0.002g of the total amount of the above-mentioned components may be added to 1 liter of the above-mentioned solution.
Fig. 1 is a block diagram showing embodiment 1 of a drainage treatment system using the complex flocculant of the present invention.
As shown in fig. 1, the settling of the solid matter of the drainage (sewage) is performed in the initial settling tank 31 and is discharged. Then, the gas is introduced into the bubble generation tank 32 to generate ultra fine bubbles, micro bubbles, or micro bubble-ultra fine bubbles. At this time, the complex flocculant of the present invention, that is, the carbide flocculant and the water-soluble polymer flocculant are added to the drainage water at the same time. Thereby, the carbide flocculating agent and the water-soluble polymer flocculating agent are dispersed in the bubble generation tank 32. In addition, the amount of the carbide coagulant and the water-soluble polymer coagulant used is reduced due to the occurrence of bubbles. Then, the sludge is introduced into the coagulation tank 33 and discharged. Next, the resultant mixture is introduced into an aerobic treatment tank 34 and subjected to an aerobic treatment. In this case, the organic components are removed in the coagulation tank 33, and the oxygen demand of the aerobic treatment tank 34 is reduced. Finally, the sludge is introduced into a final precipitation tank 35, the excess sludge is separated, and the supernatant is discharged.
Fig. 2 is a block diagram showing embodiment 2 of a drainage treatment system using the complex flocculant of the present invention.
In fig. 2, a complex coagulant of the present invention, that is, a carbide coagulant and a water-soluble polymer coagulant, is added to the coagulation tank 33. In this case, the amount of the carbide flocculant or the water-soluble polymer flocculant to be used is reduced because of the remaining bubbles generated in the bubble generation layer at the previous stage.
It should be noted that the present invention can be arbitrarily modified within the scope apparent from the above-described examples and embodiments.
Description of the symbols
31: initial settling tank
32: bubble generating tank
33: coagulation tank
34: aerobic treatment tank
35: final settling tank
The claims (modification according to treaty clause 19)
(modified) a complex flocculant comprising a carbide flocculant and a water-soluble polymer flocculant, wherein the carbide flocculant is a carbide flocculant produced without activation treatment using a woody biomass and/or an agricultural waste as a raw material.
(deletion)
(deletion)
4. The complex coagulant according to claim 1, wherein the water-soluble polymer coagulant is a water-soluble polymer derived from natural sources.
5. The complex coacervating agent according to claim 4, wherein the water-soluble polymer is chitosan.
6. The complex flocculant according to claim 1, wherein the water-soluble polymer flocculant is a modified water-soluble polymer flocculant into which at least 1 of a cationic unit, an anionic unit, a nonionic unit, an amphoteric unit, and a hydrophobic unit is introduced.
7. The complex coacervating agent according to claim 6, wherein the modified water-soluble polymer coacervating agent is at least one of modified cellulose nanofibers, modified cellulose nanocrystals, modified chitin nanofibers, modified chitin nanocrystals, modified chitosan nanofibers, and modified chitosan nanocrystals.
8. A wastewater treatment system comprising a bubble generation tank for generating microbubbles, or microbubbles-microbubbles, and a coagulation tank for coagulating the water to be treated discharged from the bubble generation tank, wherein the complex coagulant according to claim 1 is added to the water to be treated, and the water to be treated is fed as an input to the bubble generation tank.
9. A wastewater treatment system comprising a bubble generation tank for generating microbubbles, ultrafine bubbles, or microbubble-ultrafine bubbles, and a coagulation tank for adding the complex coagulant according to claim 1 to target water discharged from the bubble generation tank to coagulate the target water.
(in addition) the complex coacervating agent of claim 1, wherein the woody biomass is cedar.
(in addition) the complex coagulant according to claim 1, wherein the agricultural waste is rice hulls.
Statement or declaration (modification according to treaty clause 19)
1. In the written opinions reported in the international search, the claim 1 is considered to be not novel or inventive in the reference documents JP55-109488A, JP49-116856A, JP2005-21783A or WO2009/054063A1, but any reference document does not suggest a carbide coagulant produced without activation treatment using a woody biomass and/or agricultural waste as a raw material, and is therefore limited thereto. The "animal and vegetable residues (domestic waste)" of the comparison document JP2005-21783A, WO2009/054063a1 is neither woody biomass nor agricultural waste.
Claims (9)
1. A complex coagulant comprises a carbide coagulant and a water-soluble polymer coagulant.
2. The complex coagulant according to claim 1, wherein the carbide coagulant is an activated carbide coagulant produced by activation treatment.
3. The complex coagulant according to claim 1, wherein the carbide coagulant is a carbide coagulant produced without activation treatment.
4. The complex coagulant according to claim 1, wherein the water-soluble polymer coagulant is a water-soluble polymer derived from natural sources.
5. The complex coacervating agent according to claim 4, wherein the water-soluble polymer is chitosan.
6. The complex flocculant according to claim 1, wherein the water-soluble polymer flocculant is a modified water-soluble polymer flocculant into which at least 1 of a cationic unit, an anionic unit, a nonionic unit, an amphoteric unit, and a hydrophobic unit is introduced.
7. The complex coacervating agent according to claim 6, wherein the modified water-soluble polymer coacervating agent is at least one of modified cellulose nanofibers, modified cellulose nanocrystals, modified chitin nanofibers, modified chitin nanocrystals, modified chitosan nanofibers, and modified chitosan nanocrystals.
8. A wastewater treatment system comprising a bubble generation tank for generating microbubbles, or microbubbles-microbubbles, and a coagulation tank for coagulating the water to be treated discharged from the bubble generation tank, wherein the complex coagulant according to claim 1 is added to the water to be treated, and the water to be treated is fed as an input to the bubble generation tank.
9. A wastewater treatment system comprising a bubble generation tank for generating microbubbles, ultrafine bubbles, or microbubble-ultrafine bubbles, and a coagulation tank for adding the complex coagulant according to claim 1 to target water discharged from the bubble generation tank to coagulate the target water.
Applications Claiming Priority (4)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2017229870 | 2017-11-30 | ||
| JP2018161430A JP2019098321A (en) | 2017-11-30 | 2018-08-30 | Composite flocculant and waste water treatment system using the same |
| JP2018-161430 | 2018-08-30 | ||
| PCT/JP2019/021014 WO2020044687A1 (en) | 2017-11-30 | 2019-05-28 | Composite coagulant and wastewater treatment system using same |
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| CN112601595A true CN112601595A (en) | 2021-04-02 |
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| JP (1) | JP2019098321A (en) |
| CN (1) | CN112601595A (en) |
| WO (1) | WO2020044687A1 (en) |
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| WO2020044687A1 (en) | 2020-03-05 |
| JP2019098321A (en) | 2019-06-24 |
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