JPH1157318A - Water purifier - Google Patents

Abstract

PROBLEM TO BE SOLVED: To enhance efficiency of the of neutralization and filteration treatment of raw water and to make equipment compact. SOLUTION: In a water purifier 10 for neutralizing and filtering the raw water to purify the water, a neutralizer is injected with a chemical injection pump 32 of a first chemical feed device 12 in proportion to a flow rate, and the neutralizer is injected with a chemical injection pump 42 of a second chemical feed device 15 in proportion to a flow rate, and an alkali component in the raw water is neutralized with the neutralizer, and salts produced by this neutralization are changed to flocks with a flocculant, and the flocks are separated and removed with a filtering device 17.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

TECHNICAL FIELD The present invention relates to a water purification device.

[0002]

2. Description of the Related Art Conventionally, in order to purify and discharge and reuse alkaline raw water such as wastewater from a sludge dewatering machine, a neutralizing agent is supplied to the raw water to neutralize the alkali of the raw water. There is a type in which generated salts are separated and removed with sea sand in a filtration tank.

[0003]

However, in the prior art, in the neutralization and filtration of raw water, the processing efficiency such as the separation and removal of salts generated by the neutralization is poor, and in order to secure a constant processing flow rate, The equipment must be enlarged, for example, a large filtration tank is required.

[0004] It is an object of the present invention to improve the efficiency of neutralization and filtration of raw water and to make the equipment compact.

[0005]

According to a first aspect of the present invention, there is provided a water purification apparatus for neutralizing and filtering raw water to purify the raw water. Tank supplied with water, a first chemical liquid supply device for supplying a neutralizing agent in the first chemical liquid tank to the neutralization tank by a chemical injection pump, and raw water generated in the neutralization tank connected to the neutralization tank A water supply pipe for conveying treated water comprising a coagulant and a neutralizing agent; a water supply pump interposed in an intermediate portion of the water supply pipe for conveying the treated water while stirring; A second chemical liquid supply device for supplying to the water pipe by the injection pump, a filtration device connected to the end of the water pipe for filtering the treated water, and a flow rate interposed in the middle of the water pipe to detect the flow rate of the treated water And a chemical infusion pump of the first chemical liquid supply device, which has a detection result of the flow rate detector and a medium Based on the detection result of the PH meter provided in the tank, the proportional injection of the neutralizing agent is performed, and the chemical infusion pump of the second chemical liquid supply device uses the detection result of the flow rate detector and the chemical liquid by the second chemical liquid supply device of the water pipe. P provided downstream of the supply point
Based on the detection result of the H meter, the flow rate of the neutralizing agent is injected in proportion to the flow rate, the alkali of the raw water is neutralized with the above neutralizing agent, and the salts generated by the neutralization are flocculated with the flocculant.
This floc is separated and removed by a filtration device.

According to a second aspect of the present invention, there is provided the third aspect of the present invention, wherein at least one of a heavy metal-compatible chemical and a bactericide in the third chemical liquid tank is supplied to the water pipe by a chemical injection pump. A chemical supply device is provided, and the chemical injection pump of the third chemical solution supply device performs flow proportional injection of these chemical solutions based on the detection result of the flow rate detector and the detection result of the PH meter provided in the purified water area on the outlet side of the filtration device. It is something to do.

[0007]

According to the first aspect of the present invention, the following effects are obtained. The first and second chemical liquid supply devices perform the flow rate proportional injection of the neutralizing agent based on the flow rate detection result of the treated water and the PH detection result of the treated water supplied with the neutralizing agent. Therefore, it is possible to ensure the neutralization of the raw water.

The salts formed by the neutralization are flocculated with a flocculant, and the flocs are separated and removed by a filtration device, whereby the separation and removal can be ensured.

Since the water supply pump conveys the treated water in the water supply pipe with stirring, the neutralization reaction and the agglutination reaction of the treated water can be promoted.

According to the second aspect of the present invention, the following operations are provided. A third chemical liquid supply device for injecting a heavy metal-compatible drug and a bactericide in proportion to the flow rate of the treated water and the PH detection result on the outlet side of the filtration device; Sterilization can be ensured.

[0011]

FIG. 1 is a schematic diagram showing an example of a water purification device, FIG. 2 is a schematic diagram showing a modification of a neutralization tank, and FIG. 3 is a flowchart of the water purification device.

The water purification device 10 uses the waste water of the sludge dewatering machine 1 and other waste water as raw water, and neutralizes and filters the raw water to make purified water. The water purification device 10 is, as shown in FIG.
It has a neutralization tank 11, a first chemical liquid supply device 12, a water supply pipe 13, a water supply pump 14, a second chemical liquid supply device 15, a third chemical liquid supply device 16, a filtration device 17, and a flow rate detector 18.

The neutralization tank 11 is supplied with raw water composed of waste water from the sludge dehydrator 1 and the like from a drain chute 21. At this time, it is assumed that the wastewater from the sludge dewatering machine 1 or the like is supplied with a flocculant for flocculating suspended substances. If the coagulant is not supplied to the drainage of the sludge dewatering machine 1 or the like, the coagulant is mixed with the neutralizing agent supplied to the neutralization tank 11 by the first chemical liquid supply device 12 and supplied. As the coagulant, a high molecular weight water-soluble polymer (for example, Diafloc Co., Ltd. Diafloc) is used. This flocculant reacts with suspended substances such as colloids and fine particles suspended in water in a diluted state dissolved in water, neutralizes its surface charge, aggregates it, and adsorbs and crosslinks it. This forms flocs and facilitates separation and removal of suspended matter by settling or floating.

When the wastewater from the sludge dehydrator 1 or the like is batch-processed and supplied intermittently, the neutralization tank 11
Using No. 2, the concentration in the tank is made uniform (FIG. 1). When the drainage from the sludge dewatering machine 1 or the like is continuously supplied, the baffle plate 23
Is used to separate the solid content in the raw water toward the drain port 24 which is separated from the inlet 13A of the water pipe 13. The neutralization tank 11 includes a PH meter 19A.

The first chemical liquid supply device 12 supplies a neutralizing agent such as dilute sulfuric acid and a whitening agent such as diluted polyaluminum chloride (chemical liquid for increasing the transparency of treated water) of a first chemical liquid tank 31 to a chemical pump comprising a metering pump. It is supplied to the neutralization tank 11 by the injection pump 32. At this time, the chemical injection pump 32 of the first chemical liquid supply device 12 controls the electromagnetic valve 33 based on the detection result of the flow rate detector 18 described later and the detection result of the PH meter 19A provided in the neutralization tank 11. The discharge port area is adjusted, and the neutralizing agent and the whitening agent are injected into the neutralizing tank 11 in proportion to the flow rate.

The water supply pipe 13 is connected to the neutralization tank 11 and conveys the raw water, coagulant, neutralizing agent and whitening agent generated in the neutralization tank 11.

The water supply pump 14 is composed of a stirring mixing pump, and is provided at an intermediate portion of the water supply pipe 13 to convey the treated water while stirring. As the water supply pump 14, a positive displacement monoflex pump can be adopted.

The second chemical liquid supply device 15 supplies a neutralizing agent such as dilute sulfuric acid in the second chemical liquid tank 41 to the water supply pipe 13 by a chemical injection pump 42 composed of a metering pump. At this time, the second
The chemical injection pump 42 of the chemical liquid supply device 15 detects the detection result of the flow rate detector 18 described later in detail and the PH provided on the water supply pipe 13 downstream from the chemical liquid supply point 43 of the second chemical liquid supply device 15.
Based on the detection result of the total 19B, the discharge port area is adjusted by the electromagnetic valve 44, and the flow rate proportional injection of the neutralizing agent into the water supply pipe 13 is performed.

The third chemical liquid supply device 16 is for purifying the treated water into drinking water. The third chemical liquid supply device 16 supplies a neutralizing agent such as dilute sulfuric acid in the third chemical liquid tank 51, a heavy metal countermeasure, and a bactericide from the metering pump. The water is supplied to the water pipe 13 by the chemical injection pump 52.
At this time, the chemical injection pump 52 of the third chemical liquid supply device 16
The detection result of the flow rate detector 18 described in detail later
The discharge port area is adjusted by the solenoid valve 53 based on the detection result of the PH meter 19C provided in the water purification tank 63A on the inlet side of 7 and the chemicals are injected into the water supply pipe 13 in proportion to the flow rate.

The filtering device 17 is connected to the end of the water pipe 13 to filter the treated water. That is, the wastewater from the sludge dewatering machine 1 and the like is supplied to the first chemical liquid supply device 12, the second chemical liquid supply device 15,
The salt is neutralized by the neutralizing agent supplied by the chemical solution supply device 16, and the salts generated by the neutralization are flocculated by the flocculant previously supplied to the wastewater or the flocculant supplied by the first chemical solution supply device 12. This floc is separated and removed by the filtering device 17. The filtration device 17 includes filters 62A and 62B that are alternately used by the three-way valve 61, and stores the first purified water tank 63A that contains the filtered water of the filters 62A and 62B, and the overflow water of the first purified water tank 63A. A second water purification tank 63B is provided, and a water purification pipe 64 is connected to the second water purification tank 63B to discharge and reuse purified water. The first water purification tank 63A is provided with a first high-performance filter 65A for selecting fine particles of, for example, 2 μm or less, and the second water purification tank 63B is provided with a second high-performance filter 65B for selecting, for example, fine particles of 1 μm or less. Have been.
19D is a PH meter provided in the second water purification tank 63B, and 67 is a recorder for recording the detection result of the PH meter 19D.

The filtering device 17 is operated by a differential pressure flow meter 66 provided upstream of the three-way valve 61.
The clogging state of the filter A or the filter 62B is monitored, and the filters 62A and 62B are used alternately according to the monitoring result, and the stopped filter 62A or the filter 62B is backwashed.

The flow rate detector 18 is provided at an intermediate portion of the water pipe 13 and detects the flow rate of the treated water. Each of the above-mentioned chemical liquid supply devices 12, 15, 16 is controlled via a controller by a pulse signal sent from the flow rate detector 18 for each unit integrated flow rate.
The electromagnetic valves 33, 44, and 53 are opened and closed to perform the flow rate proportional injection of the chemical solution.

Accordingly, the water purification device 10 operates as follows (FIG. 3). (1) Supply the alkaline wastewater from the sludge dewatering machine 1 and the like to the neutralization tank 11. A coagulant is mixed in this drainage in advance.

(2) The first part of the first chemical liquid supply device 12
The neutralizing agent in the chemical tank 31 is supplied to the neutralization tank 11 by the chemical injection pump 32. The chemical injection pump 32 performs the proportional injection of the neutralizing agent on the basis of the detection result of the flow detector 18 and the detection result of the PH meter 19A provided in the neutralization tank 11. When the flocculant is not previously mixed in the waste water in the above (1), the coagulant is supplied to the neutralization tank 11 together with the neutralizer by the first chemical liquid supply device 12.

(3) The second part of the second chemical liquid supply device 15
The neutralizing agent in the chemical liquid tank 41 is supplied to the water pipe 13 by the chemical injection pump 42. The chemical injection pump 42 determines the flow rate of the neutralizing agent based on the detection result of the flow rate detector 18 and the detection result of the PH meter 19B provided downstream of the chemical supply point of the water supply pipe 13 by the second chemical supply device 15. Perform a proportional injection.

(4) The treated water in the water pipe 13 is conveyed by the water pump 14 while stirring.

(5) The third part of the third chemical liquid supply device 16
A neutralizing agent, a heavy metal-compatible drug, and a bactericide in the chemical liquid tank 51 are supplied to the water pipe 13 by the chemical injection pump 52. Chemical pump 5
2 performs the flow proportional injection of these chemicals based on the detection result of the flow rate detector 18 and the detection result of the PH meter 19C provided in the water purification tank 63B on the outlet side of the filtering device 17.

(6) The alkali content of the waste water from the sludge dewatering machine 1 and the like is neutralized with the neutralizing agents of (2), (3) and (5), and the salts formed are flocculated with a flocculant. The filtration device 1
7. Separation and removal.

(7) The purified water that has passed through the filtration device 17 is
Released and reused.

Therefore, according to the present embodiment, the following operations are provided. The first and second chemical liquid supply devices 12 and 15 detect the flow rate of the treated water and the P of the treated water supplied with the neutralizing agent.
Since the flow rate of the neutralizing agent is injected based on the H detection result, the neutralization of the raw water can be surely performed.

The salts formed by the neutralization are flocculated with a coagulant, and the flocs are separated and removed by the filtration device 17, whereby the separation and removal can be ensured.

Since the water supply pump 14 conveys the treated water in the water supply pipe 13 with stirring, the neutralization reaction and the agglutination reaction of the treated water can be promoted.

The third chemical liquid supply device 16 performs a flow proportional injection of a heavy metal-compatible chemical and a bactericide based on the detection result of the flow rate of the treated water and the detection result of the PH at the outlet of the filtration device 17. Heavy metal treatment and sterilization treatment of raw water can be ensured.

The embodiment of the present invention has been described in detail with reference to the drawings. However, the specific configuration of the present invention is not limited to this embodiment, and the design can be changed without departing from the scope of the present invention. The present invention is also included in the present invention.

[0035]

As described above, according to the present invention, the processing efficiency of neutralization and filtration of raw water can be improved, and the equipment can be made compact.

[Brief description of the drawings]

FIG. 1 is a schematic diagram showing an example of a water purification device.

FIG. 2 is a schematic diagram showing a modification of the neutralization tank.

FIG. 3 is a flowchart of a water purification device.

[Explanation of symbols]

 REFERENCE SIGNS LIST 10 water purification device 11 neutralization tank 12 first chemical liquid supply device 13 water supply pipe 14 water supply pump 15 second chemical liquid supply device 16 third chemical liquid supply device 17 filtration device 18 flow rate detectors 19A to 19C PH meter 31 first chemical liquid tank 32 chemicals Injection pump 41 Second chemical liquid tank 42 Chemical injection pump 51 Third chemical liquid tank 52 Chemical injection pump

Claims (2)

[Claims] 1. A water purifier for neutralizing and filtering raw water to purify water, wherein a raw water is supplied and a coagulant for flocculating suspended substances is supplied; A first chemical liquid supply device for supplying a neutralizing agent to a neutralization tank by a chemical injection pump; and a first chemical liquid supply device connected to the neutralization tank for transporting raw water generated in the neutralization tank, and treated water comprising a flocculant and a neutralizing agent. A water supply pipe, a water supply pump interposed in an intermediate portion of the water supply pipe, for conveying the treated water while stirring, a second chemical liquid supply device for supplying the neutralizing agent in the second chemical liquid tank to the water supply pipe by a chemical injection pump, A filter device connected to the end of the water supply pipe for filtering the treated water; and a flow rate detector interposed in the middle of the water supply pipe and detecting the flow rate of the treated water; The injection pump is based on the detection result of the flow detector and the detection result of the PH meter installed in the neutralization tank. The flow rate of the neutralizing agent is proportionally injected, and the chemical injection pump of the second chemical liquid supply device detects the flow rate and the PH meter provided downstream of the chemical liquid supply point of the second chemical liquid supply device in the water pipe. Based on the results, the flow rate of the neutralizing agent is injected proportionally, the alkali content of the raw water is neutralized with the above-described neutralizing agent, the salts generated by the neutralization are flocculated with a flocculant, and the floc is filtered with a filtration device. A water purifier characterized by separating and removing. 2. A chemical supply device for supplying at least one of a heavy metal-compatible chemical and a germicide in a chemical chemical tank to a water pipe by a chemical injection pump, wherein the chemical injection pump of the third chemical liquid supply device detects a flow rate. 2. The method according to claim 1, wherein the injection is performed in proportion to the flow rate of the chemical based on the detection result of the filter and the detection result of a PH meter provided in a purified water area on the outlet side of the filtration device.
The described water purification device.