JPH05177196A - Active carbon feeding device in high grade water purification system - Google Patents

Abstract

PURPOSE:To prevent the lowering in activity of nitrifying bacteria in the lower water temperature period, enable early start of bacterial growth and treat with superior removing performance of organic matters of very small amount, etc., and of ammonia. CONSTITUTION:A biological active carbon treatment column 3, an active carbon storage tank 6 and a biological active carbon aging tank 7 are disposed, and a mechanism for judging the nitrified state of biological active carbon based on the quality of water detected from a raw water storage tank 2 and an active carbon treating water storage tank 5 as the standard for judgement and feeding biological active carbon to which nitrifying bacteria are made to adhere from the biological active carbon aging tank 7 are provided between the biological active carbon treatment column 3 and the biological active carbon aging tank 7 and between the biological active carbon treatment column 3 and the active carbon storage tank 6. Further, a mechanism for feeding active carbon free of nitrifying bacteria from the active carbon storage tank 6 and a mechanism for drawing out the active carbon in the biological active carbon treatment column 3 into biological active carbon aging tank 7 or the active carbon storage tank 6 are provided.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a device for supplying activated carbon to a biological activated carbon treatment tower used for purification of tap water.

[0002]

2. Description of the Related Art Generally, when purifying raw water or secondary sewage treated water taken from rivers, etc., first, a flocculant is injected and mixed in raw water in a flocculation sedimentation tank, and suspended substances in raw water are treated by stirring and retaining. (Sand, clay, algae, and other organic substances) are aggregated, precipitated, and separated. This process incorporates algae treatment and chlorine treatment for the purpose of removing chromaticity components such as iron and manganese. Particularly in the suburbs of large cities, rivers are highly polluted, so the content of ammonia and chromaticity components including humic substances, which are precursors of the carcinogenic THM (trihalomethane), is high. React to produce chloramine and consume more chlorine than necessary, resulting in a high chlorine injection rate and TH
Increases the ability to generate M (THMFP).

From such a background, in recent years, a method of incorporating an advanced water purification system into the water purification process has been used for the purpose of removing the above-mentioned substances. This advanced water purification method includes ozone treatment and biological activated carbon treatment. For example, as an alternative to chlorine treatment, ozone treatment is performed by an ozone treatment tower, and further a chromaticity component is removed by an activated carbon treatment tower or biological filtration tower. After that, it is filtered with a sand filter, etc. and sent to a water purification tank.

The granular activated carbon packed in the activated carbon treatment tower is
Microorganisms such as nitrifying bacteria are propagated on the surface, and not only the adsorption and removal of trace organic substances in the inflowing water,
It is also possible to remove ammonia. Further, by performing the ozone treatment before the biological activated carbon treatment, it is possible to improve the tolerance against load fluctuation and the life of the activated carbon.

[0005]

However, in the case of the biological activated carbon treatment means used in the above-mentioned advanced water treatment system, the activity of nitrifying bacteria decreases in the low water temperature period in winter, and it takes time to start up the activated carbon treatment tower. There is a drawback that it costs.

That is, it is known that the activity of nitrifying bacteria is greatly influenced by the water temperature, and the activity of the nitrifying bacteria decreases in the winter when the water temperature falls below 10 ° C. as compared with the high water temperature in summer. Moreover, a phenomenon occurs in which the ammonia concentration increases conversely as the amount of water in rivers decreases. In particular, the growth rate of nitrifying bacteria is considerably slower than that of other microorganisms that remove organic substances, etc., and in particular, the temperature of water is 20% lower than that of the period in which a constant ammonia removal treatment by nitrifying bacteria is achieved. If the temperature is 10 ° C, the time required for the same steady treatment may take more than twice as long, and if the concentration of ammonia in the raw water suddenly rises above the treatment capacity of the biological activated carbon, or if nitrification occurs. If a substance that inhibits the activity of the bacterium is mixed, no countermeasure can be taken, and there arises a problem that the treatment efficiency of the activated carbon treatment tower is significantly deteriorated. Also, when the concentration of organic matter in the raw water is high, the growth rate of nitrifying bacteria is slower than that of heterotrophic bacteria, so the balance of biota is disrupted and the heterotrophic bacteria become the dominant species. May decrease.

Further, at the time of starting the operation of the activated carbon treatment tower or restarting the operation after the exchange of the activated carbon, it is necessary to grow the microorganisms on the surface of the activated carbon and perform a start-up operation in order to stabilize the biota. .. And when the growth rate of microorganisms on the surface of activated carbon is reduced, in other words, when the activity of nitrifying bacteria is reduced, the removal rate of ammonia by microorganisms is reduced in addition to the extension of the startup time. Occurs.

Further, conventionally, the activated carbon is withdrawn and replenished from the activated carbon treatment tower by coping with deterioration of the activated carbon, carryover during washing of the activated carbon, or outflow of the activated carbon. Therefore, the activated carbon is packed in the activated carbon treatment tower. The amount is almost constant regardless of the amount of raw water injected. Therefore, when the injection load of raw water is high, a predetermined treated water quality cannot be obtained, and conversely, when the injection load of raw water is low, problems arise such as wasted use of activated carbon and loss of flow rate. Further, if a load higher than the treatment capacity of the biological activated carbon is applied, there is a fear that the biological activated carbon may be deteriorated early.
There is a problem in that the number of times of washing with activated carbon must be increased in response to this.

In view of these problems, the present invention prevents the activity of nitrifying bacteria from decreasing in the low water temperature period and enables the biological activated carbon treatment tower to be started up early, and moreover, the removal performance of trace organic substances and the removal performance of ammonia. It is an object of the present invention to provide an apparatus capable of excellent processing.

[0010]

[Means for Solving the Problems] In order to achieve the above object, the present invention comprises a raw water storage tank, and raw water is treated from the raw water storage tank, and the surface is filled with granular activated carbon in which microorganisms are propagated. In a highly purified water treatment apparatus comprising a biological activated carbon treatment tower and an activated carbon treated water storage tank, an activated carbon storage tank and a biological activated carbon replenishment tank are provided separately from the biological activated carbon treatment tower, and the biological An oxygen supply mechanism for the nitrifying bacteria in the tank is provided in the activated carbon rectification tank, and the raw water is provided between the biological activated carbon treatment tower and the biological activated carbon rectification tank, and between the biological activated carbon treatment tower and the activated carbon storage tank. The nitrification state of the biological activated carbon is judged based on the water quality detected from the storage tank and the activated carbon treated water storage tank, and the biological activated carbon with the nitrifying bacteria adhering to it is fed from the biological activated carbon rectification tank into the biological activated carbon treatment tower. And the mechanism A mechanism for supplying activated carbon unattached of nitrifying bacteria to biological activated carbon treatment tower of activated carbon reservoir,
A structure is provided in which a mechanism for extracting the activated carbon in the biological activated carbon treatment tower to a biological activated carbon replenishment tank or an activated carbon storage tank is provided.

Further, according to claim 2, the concentration of ammonia in the raw water storage tank and the activated carbon treated water storage tank is used as the criterion for determining the water quality. According to claim 3, the raw water storage tank and the activated carbon are used as criteria for determining the water quality. The feature is that the ultraviolet absorption of the treated water storage tank is used. According to claim 4, the amount of activated carbon drawn from the biological activated carbon treatment tower is
It is determined from the treatment load amount per unit activated carbon of the biological activated carbon treatment tower, and according to claim 5, ammonia raw water for supplying raw water containing ammonia to the biological activated carbon rectifying tank at regular intervals or continuously. It has a supply department.

[0012]

According to this structure, during normal raw water treatment, the raw water flows from the raw water storage tank into the biological activated carbon treatment tower, is purified by the granular activated carbon, and the nitrifying bacteria that propagate on the surface of the granular activated carbon. By the action of, not only the adsorption and removal of trace organic substances but also ammonia is removed.

Then, the water quality of the raw water storage tank and the activated carbon treated water storage tank and the nitrification state of the biological activated carbon are judged based on the ammonia concentration or the ultraviolet absorbance as a criterion, and the actual activated carbon treatment is carried out rather than the ammonia concentration allowed as the activated carbon treated water. When the ammonia concentration of water is higher, the bioactive carbon having nitrifying bacteria attached thereto is supplied to the bioactive carbon treatment tower from the bioactive carbon rectification tank. As a result, the amount of attached microorganisms on the surface of the activated carbon in the biological activated carbon treatment tower is increased, the activity of nitrifying bacteria is improved, and as a result, the removal rate of ammonia in raw water is increased.

Further, the UV absorbance of the activated carbon treated water storage tank and the raw water storage tank is measured, and the absorbance and the chromaticity are compared with preset allowable absorbance and allowable chromaticity to obtain both the absorbance and the chromaticity. When there is a difference, activated carbon free from nitrifying bacteria is supplied to the biological activated carbon treatment tower from the activated carbon storage tank.

When it is necessary to further increase the treatment efficiency of activated carbon, the amount of activated carbon drawn out is determined from the treatment load per unit activated carbon of the biological activated carbon treatment tower, and the activated carbon in the biological activated carbon treatment tower is conditioned by the biological activated carbon. It is pulled out to a tank or an activated carbon storage tank.

By supplying raw water containing ammonia from the raw water supply unit to the above-mentioned biological activated carbon rectifying tank at regular intervals or continuously, the growth efficiency of nitrifying bacteria is improved.

[0017]

EXAMPLE An example of the activated carbon supply device in the advanced water purification treatment according to the present invention will be described below. In the schematic view of this embodiment shown in FIG. 1, 1 is raw water, 2 is a raw water storage tank,
Reference numeral 3 denotes a biological activated carbon treatment tower into which the raw water 1 flows, and the biological activated carbon treatment tower 3 is filled with granular activated carbon 4. 5 is an activated carbon treated water storage tank.

On the other hand, 6 is an activated carbon storage tank, and 7 is a biological activated carbon replenishment tank, and the activated carbon storage tank 6 is filled with slurry activated carbon to which nitrifying bacteria are not attached. In addition, the activated carbon to which the nitrifying bacteria are attached is filled with the solvent in the biological activated carbon culturing tank 7 to supply oxygen to nitrifying bacteria which are aerobic bacteria. 9 is arranged, and air is sent to the air diffuser 9 from a blower 10 provided outside. Reference numeral 8 denotes an ammonia raw water storage tank for supplying raw water containing ammonia to the biological activated carbon rectifying tank 7 at regular intervals or continuously. The ammonia raw water storage tank 8, the diffuser pipe 9 and the blower 10 constitute an ammonia raw water supply unit.

The activated carbon storage tank 6 and the biological activated carbon acclimation tank 7
The ammonia raw water storage tank 8 is arranged separately from the treatment system of the raw water 1 using activated carbon. By arranging the biological activated carbon replenishment tank 7 entirely in the thermostatic bath, the remediation action of nitrifying bacteria can be enhanced.

Reference numeral 11 in the figure denotes a flow meter for raw water 1, 12, 1
3, 14 are three-way cocks for switching the flow paths, 15, 16, 17,
18 is a fluid pump, 19 is an ultraviolet absorptiometer, 20 is an ammonia electrode, and 21 is a water thermometer. Further, 22 is the flowmeter 11, the ultraviolet absorptiometer 19, the ammonia electrode 20.
And the input signals from the water temperature gauge 21 to receive the flow path switching three-way cocks 12, 13, 14 and the fluid pumps 15, 16, 1.
A controller that outputs a signal for controlling the operating states of 7 and 18, and 23 is a central processing unit (CPU) in which desired data is stored in advance. As the controller 22, a DDC (Direct digital control) method is adopted.

According to this structure, in the case of performing normal raw water treatment, raw water 1 flows from the raw water storage tank 2 into the biological activated carbon treatment tower 3 via the flow meter 11 and is purified by the granular activated carbon 4. In addition to the adsorption and removal of trace organic substances, ammonia is also removed by the action of nitrifying bacteria that propagate on the surface of the granular activated carbon 4.

In this embodiment, the biological activated carbon treatment tower 3
It is characterized in that the activated carbon is supplied to or removed from the activated carbon. The activated carbon supply and the withdrawal operations are composed of the following three operation modes.

(1) Supply of bioactive carbon to which nitrifying bacteria are attached (2) Supply of active carbon to which nitrifying bacteria are not attached (3) Extraction of activated carbon from biological activated carbon treatment tower The above three operation modes will be described below. Each will be explained.

(1) Supply of Biological Activated Carbon with Nitrifying Bacteria Attached The ammonia concentrations in the raw water storage tank 2 and the activated carbon treated water storage tank 5 are detected by the ammonia electrode 20 via the signal lines S ₁ and S _2. The supply amount of bioactive carbon to the bioactive carbon treatment tower 3 is determined based on the ammonia concentration. That is,
Ammonia electrode output value V ₁ (mv) of the raw water storage tank 2,
Ammonia electrode output value V ₂ (m of activated carbon treated water storage tank 5
v) are detected by the ammonia electrode 20, and the detected values are input to the controller 22, and the ammonia concentration (mg-N / l) and the ammonia stored in the central processing unit 24 as shown in FIG. Electrode output value (m
The actual ammonia concentration of the raw water and the treated water is calculated from the correlation diagram with v), and the ammonia removal rate of the biological activated carbon treatment tower 3 is calculated. Then, the ammonia concentration allowed as activated carbon treated water (C _Nset ) is _compared with the actual ammonia concentration of activated carbon treated water (C _NV2 ), and if (C _Nset ) <(C _NV2 ), biological activated carbon replenishment is performed. The biological activated carbon having nitrifying bacteria attached thereto is supplied from the tank 7 to the biological activated carbon treatment tower 3. When (C _Nset ) ≧ (C _NV2 ), the supply of the biological activated carbon from the biological activated carbon replenishment tank 7 to the biological activated carbon treatment tower 3 is not performed.

When the biological activated carbon is supplied from the biological activated carbon replenishment tank 7, the signal line S ₃ from the controller 22 is supplied.
The flow path switching three-way cock 14 is switched to the biological activated carbon replenishment tank 7 side, and at the same time, the fluid pump 16 is operated by the signal line S _4, whereby the driving force of the fluid pump 16 causes the biological activated carbon treatment tower 3 to nitrify bacteria. The biological activated carbon to which is attached is supplied. As a result, the amount of attached microorganisms on the surface of the activated carbon in the biological activated carbon treatment tower 3 is increased, the activity of nitrifying bacteria is improved, and as a result, the removal rate of ammonia in the raw water 1 can be increased.

Aeration is carried out in the tank by supplying air from a blower 10 provided outside the biological activated carbon acclimation tank 7 to an air diffuser 9 arranged at the inner bottom of the biological activated carbon acclimation tank 7. Then, agitation is performed, oxygen is supplied to the nitrifying bacterium which is an aerobic bacterium, and a large amount of the growing nitrifying bacterium adheres to the surface of the activated carbon.

Here, the principle of measuring the ammonia concentration by the ammonia electrode 20 will be briefly described. Generally, ammonium ions dissolved in water are in equilibrium with hydrogen ions as shown in the following equation.

NH ₃ + H ⁺ ← → NH ₄ ⁺ (1) Here, the solution When the pH of the above is set to 11 or more, the equilibrium in the above formula shifts to the left, and most of the ammonium ions exist as ammonia. This dissolved ammonia dissolves in the internal liquid containing a fixed concentration of ammonium chloride through the gas permeable membrane, and the equilibrium in the above equation changes to the right. This reaction reduces the hydrogen ion concentration of the internal liquid and changes the potential of the pH electrode inside the membrane to the negative side, so that the dissolved ammonia concentration (ammonium ion) can be indirectly measured.

More specifically, the theoretical formula of the glass electrode for pH measurement is Nernst's formula: E = E ₀ + (2.303 RT) / (F · log [H ⁺ ]) (2) (2) .303RT / F: Nernst constant), and the equation (1) is [NH ₃ ] [H ⁺ ] / [NH ₄ ⁺ ] = K.・ ・ ・ Satisfies the equilibrium equation (3). Ammonium ion C of internal solution
Assuming (mol / l), the formula (3) becomes [H ⁺ ] = (C · K) / [NH ₃ ] ....・ It becomes the formula (4) and becomes the function of the ammonia concentration. From the expressions (2) and (4), E = E ₀ + (2.303RT) / F · {log (C · K) / [NH ₃ ]} ... .... (5) where _{E '= E 0 + (2.303RT} ) / F · {lo
If g (C · K)}, then E = E ′ − (2.303RT) / F · {log [NH ₃ ]} ·· (6) (2.303 RT / F) is the change in the potential difference when the concentration changes 10 times and is called the potential gradient.
Is 59.16 mv. Therefore, the ammonia (ammonium ion) concentration in the sample can be determined by calibrating the standard solution and determining the potential gradient value and E ₀ .

(2) Supply of activated carbon to which nitrifying bacteria are not adhered The supply of activated carbon to which nitrifying bacteria are not adhered is such as carryover of activated carbon 4 accompanying the washing operation of the biological activated carbon treatment tower 3 or the activated carbon 4 This will be done in response to the deterioration of water quality due to the increase in runoff and load of treated water. In this case, the absorbances of the raw water storage tank 2 and the activated carbon treated water storage tank 5 are measured by the ultraviolet absorptiometer 19. Ultraviolet absorbance (UV) is an analytical method utilizing the fact that light is absorbed by a substance in the range of 200 to 400 nm, which is the wavelength range of ultraviolet rays, and the absorbance is measured at a wavelength of 260 nm (E26).
0) and the absorbance at a wavelength of 370 nm (E370)
Is carried out using. The above E260 has a high correlation with the permanganate consumption (mg / l) as shown in FIG.
It is known that E370 has a high correlation with the chromaticity Y as shown in FIG.

Then, E260 and E370 of the activated carbon treated water storage tank 5 and the raw water storage tank 2 are detected by the ultraviolet absorptiometer 19 via the signal lines S ₅ and S _6, and the detected values are transmitted to the controller 22, The permanganate consumption concentration (K _out ) and chromaticity (C _out ) of the activated carbon treated water storage tank 5 are measured. Then, the permissible permanganate consumption concentration (K _set ) preset in the central processing unit 24 is compared with the permissible chromaticity (C _set ), and (K _set ) − (K _out ) ≧ 0 and (C _set). ) − (C _out ) ≧ 0 ... (7), activated carbon without nitrifying bacteria is fed from the activated carbon storage tank 6 to the biological activated carbon treatment tower 3. Further, in the case of (K _set ) − (K _out ) <0, or (C _set ) − (C _out ) <0 (8), the activated carbon from the activated carbon storage tank 6 to the biological activated carbon treatment tower 3 is Will not be supplied to Therefore, the activated carbon is supplied to the biological activated carbon treatment tower 3 only when (C _out ) or (K _out ) exceeds the concentration allowed as the activated carbon treated water.

When activated carbon is supplied from the activated carbon storage tank 6, the flow path switching three-way cock 14 is switched to the activated carbon storage tank 6 side by the signal line S ₃ from the controller 22, and at the same time, the fluid pump 17 is supplied by the signal line S ₇ . By operating the above, the driving force of the fluid pump 17 supplies the activated carbon in a slurry state from the activated carbon storage tank 6 to the biological activated carbon treatment tower 3.

(3) Extraction of Activated Carbon from Biological Activated Carbon Treatment Tower In the operation of extracting activated carbon, the quality of raw water is improved due to an increase in the amount of water in the river during the rainy season and the treatment efficiency of activated carbon increases as the amount of water increases. It is carried out when it has to be raised. The amount of this activated carbon extracted is the amount of treatment load (X) per unit activated carbon (X) to the biological activated carbon treatment tower 3.
/ M).

(X / M) = (Q · C) · (1 / M) ···· (9) where Q: activated carbon treatment tower Amount of influent water to 3 C: Concentration of substance in influent M: Amount of activated carbon filled in activated carbon treatment tower 3, that is, concentration of substance C in activated carbon treatment tower 3 of treatment load amount (X / M) per unit activated carbon / 2, the processing load when inflowing with the inflow water amount Q is (X / M) '= (QC) / (2M) ....・ It becomes (10). Therefore, the flow rate load during operation of the biological activated carbon treatment tower 3 is ½ of the treatable load amount. Therefore, in order to perform the treatment with the load amount (X / M), the flow rate may be doubled or the activated carbon filling amount may be halved. The flow rate depends on the capacity of the activated carbon treated water storage tank 5 or the plant. Since it depends on the planned flow rate, it is economically preferable to reduce the filling amount of the activated carbon in the biological activated carbon treatment tower 3 to 1/2.

When the activated carbon is withdrawn from the biological activated carbon treatment tower 3, the flow path switching three-way cocks 12 and 13 are switched to the biological activated carbon replenishment tank 7 side and the fluid pump 15 is operated by the signal line S ₈ from the controller 22. To do. As a result, the activated carbon is extracted from the upper layer portion and the lower layer portion of the biological activated carbon treatment tower 3 and fed into the biological activated carbon acclimation tank 7. Further, a part of the activated carbon extracted by switching the flow path switching three-way cock 13 in the other direction is sent to the activated carbon storage tank 6.

The ammonia concentration of the biological activated carbon rectifying tank 7 is detected by the ammonia electrode 20 through the signal line S ₉ so that the biological activated carbon rectifying tank 7 does not become the rate-determining standard, and the ammonia concentration is constantly monitored. In addition, the fluid pump 1 operated by the signal line 22 output from the controller 22 when the reference rate is controlled.
By supplying raw water containing ammonia from the ammonia raw water storage tank 8 at regular intervals or continuously using the No. 8, the growth efficiency of nitrifying bacteria in the biological activated carbon rectifying tank 7 is improved. Further, in order to maintain the amount of microorganisms in the biological activated carbon replenishment tank 7, the cleaning wastewater of the biological activated carbon treatment tower 3 is flown into the biological activated carbon replenishment tank 7 via the pipe 25. Further, even when the operation of the biological activated carbon treatment tower 3 is started, or when the operation is restarted after the activated carbon is exchanged, even when the start-up operation is performed to grow the microorganisms on the surface of the activated carbon and stabilize the biota, By supplying the bioactive carbon to which the nitrifying bacteria are attached from the bioactive carbon acclimation tank 7, the growth rate of microorganisms is accelerated, so that the startup operation time can be shortened.

[0037]

As described above, according to the present invention,
The water quality of the raw water storage tank and the activated carbon treated water storage tank and the nitrification state of the biological activated carbon are judged based on the ammonia concentration or ultraviolet absorbance as the judgment criteria, and based on this judgment, nitrifying bacteria from the biological activated carbon preparation tank to the biological activated carbon treatment tower By supplying the attached activated carbon, the nitrifying bacteria grow in the biological activated carbon treatment tower and the activity of the nitrifying bacteria on the surface of the activated carbon is improved,
Ammonia removal rate of raw water can be increased. In particular, the activity of nitrifying bacteria is likely to decrease in the winter when the water temperature is lower than when the water temperature is high in the summer, so it is effective to apply the present invention in the winter, and accordingly, the steady state by the nitrifying bacteria at the time when the water temperature decreases It is possible to shorten the time for achieving the effective ammonia removal treatment. Further, it becomes possible to deal with the case where a substance that inhibits the activity of nitrifying bacteria is mixed in the treated water.

Further, by supplying activated carbon free from nitrifying bacteria from the activated carbon storage tank, it is possible to immediately deal with carryover of nitrifying bacteria or when a load exceeding the processing capacity is applied to the activated carbon processing tower. It is possible.

When it is necessary to enhance the treatment efficiency of activated carbon, the amount of activated carbon removed is determined from the treatment load per unit activated carbon of the biological activated carbon treatment tower, and the activated carbon in the biological activated carbon treatment tower can be extracted. Furthermore, when the operation of the biological activated carbon treatment tower is started, or when the operation is restarted after the activated carbon is replaced, the growth rate of microorganisms on the surface of the activated carbon can be accelerated, which makes it possible to shorten the start-up operation time, and to reduce the trace amount. Provided is an apparatus capable of performing a treatment excellent in both removal performance of organic substances and the removal performance of ammonia nitrogen.

[Brief description of drawings]

FIG. 1 is a schematic view showing an embodiment of an activated carbon supply device in an advanced water purification treatment according to the present invention.

FIG. 2 is a graph showing the correlation between ammonia concentration and ammonia electrode output value.

FIG. 3 is a graph showing the correlation between absorbance and permanganate consumption.

FIG. 4 is a graph showing the correlation between absorbance and chromaticity.

[Explanation of symbols]

1 ... Raw water, 2 ... Raw water storage tank, 3 ... Biological activated carbon treatment tower, 4
... Granular activated carbon, 5 ... Activated carbon treated water storage tank, 6 ... Activated carbon storage tank, 7 ... Biological activated carbon replenishment tank, 8 ... Ammonia raw water storage tank, 9 ... Aeration pipe, 10 ... Blower, 11 ... Flowmeter, 12,
13, 14 ... Three-way cock for flow path switching, 15, 16, 1
7, 18 ... Fluid pump, 19 ... Ultraviolet absorptiometer, 20
... Ammonia electrode, 21 ... Water thermometer, 22 ... Controller, 23 ... Central processing unit.

Claims (5)

[Claims] 1. A raw water storage tank, a biological activated carbon treatment tower in which raw water is inflow-treated from the raw water storage tank, and the surface is filled with granular activated carbon in which microorganisms have propagated, and an activated carbon treatment water storage tank. In the advanced water purification apparatus, the activated carbon storage tank and the biological activated carbon replenishment tank are provided separately from the biological activated carbon treatment tower, and the biological activated carbon replenishment tank is provided with an oxygen supply mechanism for nitrifying bacteria in the tank. The water quality detected from the raw water storage tank and the activated carbon treated water storage tank is provided between the biological activated carbon treatment tower and the biological activated carbon replenishment tank, and between the biological activated carbon processing tower and the activated carbon storage tank. As a function of determining the nitrification state of the biological activated carbon, the mechanism for supplying the biological activated carbon with nitrifying bacteria adhering to the biological activated carbon treatment tower from the biological activated carbon replenishment tank and the nitrifying bacteria to the biological activated carbon treatment tower from the activated carbon storage tank. Adhesion of A mechanism for supplying the activated carbon is not, activated carbon supply device in the advanced water treatment, characterized in that the deployment mechanism to pull out the activated carbon organism activated carbon treatment tower in biological activated carbon order Yoso or activated carbon reservoir. 2. The activated carbon supply apparatus for advanced water purification treatment according to claim 1, wherein the concentration of ammonia in the raw water storage tank and the activated carbon treated water storage tank is used as the criterion for judging the water quality. 3. The activated carbon supply apparatus for advanced water purification treatment according to claim 1, wherein the absorbance of ultraviolet rays of the raw water storage tank and the activated carbon treatment water storage tank is used as the water quality judgment criterion. 4. The activated carbon supply apparatus for advanced water purification treatment according to claim 1, wherein the amount of activated carbon drawn from the biological activated carbon treatment tower is determined from the treatment load amount per unit activated carbon of the biological activated carbon treatment tower. 5. The activated carbon supply device for advanced water purification treatment according to claim 1, wherein the biological activated carbon rectifying tank is provided with an ammonia raw water supply unit for supplying raw water containing ammonia at regular intervals or continuously.