JPH0985282A - Water improving apparatus of rivers or lakes or marshes - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a water improving apparatus simple in equipment maintenance, low in maintenance cost and excellent in practicality by providing a bacteria treatment tank supporting inclusively fixed photosynthetic bacteria on a raw water supply side and providing a contact oxidizing tank supporting a reticulated member composed of fibers on the downstream side thereof. SOLUTION: A water improving apparatus main body 1 is divided into three tanks and a sand sedimentation tank 2 is divided into two tanks by a submerged weir plate 2a. A bacteria treatment tank (biological tank) 3 supports inclusively fixed photosynthetic bacteria 3 and a contact oxidizing tank 4 has a plurality of fishing nets 4a vertically arranged thereto and has a distributing plate 4b on the upstream side thereof. A falling aeration tank 5 is provided to the downstream end of the contact oxidizing tank 4 and treated water is once stored in the tank 5 to be discharged from a discharge pipe 6a. If photosynthetic bacteria are used as above, water can be directly purified and improved and the photosynthetic bacteria contribute to the activation of pollutant decomposing bacteria as a nutrition source of bacteria to enhance water improving efficiency.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a device for improving the quality of water such as rivers, lakes, and sewage treatment water.

[0002]

2. Description of the Related Art Deterioration of water quality in rivers, lakes and marshes due to domestic wastewater, factory wastewater, spraying of agricultural chemicals, etc. has become a serious social problem. Although it has been improved by the laws and regulations of the national and local governments, the development of sewerage, etc., the occurrence of water-bloom, red tide, etc. is recognized, and the current situation is that water quality is not sufficient.
It has become an important issue that must be resolved immediately.

In particular, maintenance and management such as sludge removal in purification facilities, and removal of nutrient salts (nitrogen, phosphorus, etc.) have become important issues in purification.

Conventionally, in order to solve these problems, a purifying apparatus using plants, a catalytic oxidizer using gravel and charcoal, etc. have been used, and various shapes of plastic materials have also been used as contact materials.

[0005]

However, in such a conventional apparatus, the improvement / improvement rate of water quality is low, the efficiency is lowered due to long-term use, and the cost for maintenance is high. However, it is not always a practically established device.

Therefore, the present invention improves the water quality of rivers, lakes and marshes, sewage treatment water, etc., has a good improvement rate, and can be stably used for a long period of time, and the facility maintenance is simple and the maintenance cost is low. Also aims to provide an inexpensive and highly practical water quality improving device.

[0007]

Means for Solving the Problems The present invention is to solve the above-mentioned problems by providing a microbial treatment tank (bio tank) carrying entrapping and fixing photosynthetic bacteria on the raw water supply side, and using a fiber on the downstream side. The present invention relates to a novel water quality improving device, which is provided with a catalytic oxidation tank supporting a reticulated body, and improves the water quality by sequentially passing raw water through these tanks. The present invention relates to a water quality improving device which obtains clean treated water with a particularly low content of nutrients by adding a soil water purification tank filled with volcanic soil on the downstream side of.

[0008]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described in detail below with reference to the drawings.

FIG. 1 is a perspective view showing an example of a water quality improving device comprising a microorganism treatment tank (bio tank) and a catalytic oxidation tank according to the present invention, and FIG. It is a perspective view which shows an example of the soil water purification tank suitably installed in combination with a contact oxidation tank.

In FIG. 1, reference numeral 1 denotes a water quality improving device main body according to the present invention, which forms a rectangular parallelepiped tank as a whole.

The main body 1 is divided into three tanks as shown in FIG. 1, and the first tank 2 from the raw water supply side is a sand settling tank,
The sand settling tank 2 is divided into two by a submerged dam plate 2a. The second tank 3 following this is a photosynthetic bacterium 3a that is entrapped and fixed.
It is a microbial treatment tank (bio tank) carrying. Further, the third tank 4 continuing to the downstream side is a contact oxidation tank in which a plurality of fishing nets 4a made of synthetic fibers or natural fibers attached to a metal frame are installed in the vertical direction.
b is provided. In the example of FIG. 1, a drop aeration tank (head aeration tank) 5 is provided at the downstream end of the catalytic oxidation tank 4 in contact with it.
Is provided and the treated water is once stored in the tank 5, and then the discharge pipe 6a is provided.
More treated water is discharged. The upstream side 1a is a raw water supply pipe through which raw water flows into the water quality improvement device main body 1.

Spaces are provided below the sand settling tank 2, the microbial treatment tank 3 and the contact oxidation tank 4, respectively.
Alternatively, the generated sludge or the like is accumulated here, and if necessary, the accumulated sludge is extracted from the sludge extractor provided at the bottom of the main body 1 by an appropriate means.

In this apparatus, the raw water supplied from the supply pipe 1a is a sand settling tank 2, a microbial treatment tank 3, and a catalytic oxidation tank 4.
Through the discharge aeration tank 5 through the discharge pipe 6a.

In the apparatus shown in FIG. 1, the sand settling tank 2 is provided on the upstream side of the microbial treatment tank 3, but this can be omitted for the treatment of raw water with a small amount of sandy substances. Also,
The form of the sand settling tank 2 is not limited to the one shown in the figure, and any form can be used, and the number of submerged dam plates 2a can be increased or decreased as necessary.

The photosynthetic bacteria which are entrapped and fixed on the microorganism treatment tank 3 are bacteria that grow by photoinorganic nutrition or photoorganotrophy using light energy, and are of the genus Rhodopseudomonas of the genus Rhodospirillum. Genus, Chromatium
Bacteria belonging to any of the genera, Chloroflexus genus, Chlorobium genus, and the like can be used. Specific examples of suitable photosynthetic bacteria include Rhodopseudomonas capsulata and Rhodopseudomonas philidis. Rp. Viridis) and Rhodospirillum rubram (Rs. Rubrum). These photosynthetic bacteria may be collected, cultured and concentrated from a highly concentrated habitat such as a lake, but commercially available photosynthetic bacteria can be used.

As carriers for entrapping immobilization of photosynthetic bacteria, there are natural polymer gels such as agar, color geninan and alginic acid, and synthetic polymer gels such as polyvinyl alcohol and polyacrylamide. Agar, which can also be used as salt, is advantageously used.

As a method for supporting the photosynthetic bacteria entrapped and fixed in agar or the like on the microbial treatment tank 3, a method of placing the photosynthetic bacteria on a shelf provided in the tank or filling a bag-like net body and suspending it is suspended. Any method can be adopted depending on the design of the microorganism treatment tank.

As the net-like body 4a made of fibers carried in the catalytic oxidation tank 4, a fishing net is preferable in view of handling and cost. As the material of the mesh body 4a, polyester, nylon, polyacrylonitrile, cotton, hemp, etc. can be used, but polyester is advantageously used from the viewpoint of microbial adhesion and durability. Further, it is preferable that the net-like body 4a such as a fishing net is attached and fixed to a frame such as a metal frame. Further, in order to prevent a short path of the flow path, it is preferable to appropriately insert a non-woven fabric or the like between the plurality of mesh bodies 4a.

The mesh 4a is not limited to a fishing net, but any mesh structure can be used, which is less likely to be clogged, has durability, is lightweight, and has a low cost mesh structure. The body is preferably used. Further, as a method of supporting the net-like body in the tank, it is attached to the metal frame as described above,
Not limited to the method of mounting a plurality of units in parallel in the vertical direction, the tank 4
Depending on the shape and capacity of the water, it can be supported horizontally so that the contact oxidation surface (adhesion surface of microbes in water) does not interfere effectively with the water flow, reducing the flow resistance and increasing the efficiency of the contact oxidation surface. In consideration of the above, an appropriate loading method can be adopted. When loaded vertically as shown in Fig. 1,
There is an advantage that sludge attached to the contact surface can be easily removed.

The drop aeration tank 5 is not always necessary, and in some cases, the direct contact oxidation tank 4 is provided with a discharge pipe 6 to discharge the water directly or to connect it to a downstream soil water purification tank. 2 will be described later).

Further, in this example, although the aeration system is not shown, the water quality improvement device main body 1 may be used if necessary.
It is also possible to provide an air diffuser at the bottom of the so as to perform aeration continuously or intermittently and to wash the contact oxidation surface.

In the present invention, the addition of a soil water purification tank on the downstream side of the water quality improvement device main body 1 having the above-mentioned structure is effective in obtaining treated water having a low content of nutrient salts, particularly phosphorus salts. It is valid.

FIG. 2 is a perspective view showing an example of the soil water purification tank according to the present invention.

The soil water purification tank 7 is a rectangular parallelepiped, and a partition plate 7
The soil-filling dividing tank 8 partitioned by a and the bottom plate 7b and partitioned by each partition plate is filled with red ball soil having a diameter of 10 to 15 mm, which is a kind of volcanic soil.

The partition plates 7a are arranged so as to alternately form a submerged weir and an overflow weir (overflow weir) so that the water to be treated flows as shown by arrows in the figure. A sludge reservoir is formed between the filter material-filled bottom plate 7b and the bottom plate 7c of the soil water purification tank body.
The water to be treated (in this case, the water from the discharge pipe 6 in FIG. 1) is
It is supplied to the first soil filling division tank 8 and alternately passes through the submerged weir and the overflow weir (overflow weir) to ascend and descend each soil filling division tank 8 to reach the head aeration tank 9 and The purified treated water is discharged.

In the above description, the example of introducing the treated water into the soil water purification tank 7 into the contact oxidation tank 4 of FIG. 1 without passing through the drop aeration tank 5 was described. It goes without saying that it may be introduced into the soil septic tank 7 from the discharge pipe 6a.

The volcanic soils used in the soil septic tank 7 include Akadama soil, Kanuma soil, Kuroboku soil, pumice stone, etc. Or Kanuma soil is advantageously used. Further, the configuration and form of the soil septic tank 7 can be appropriately optimized depending on the water quality (pollution degree, pollutant, etc.) and flow rate of the raw treated water.

The water quality improving device of the present invention is usually used by being buried in soil, but the device main body and the lid on the top of the soil septic tank may be provided with a light receiving window or the like to make it transparent. It may be light-shielding. Which one is selected is appropriately selected according to the type of photosynthetic bacteria, the property of the inflowing treated water, and the type of photosynthetic bacteria.

[0029]

Industrial Applicability As described above, the apparatus of the present invention has a microbial treatment tank carrying entrapping and immobilized photosynthetic bacteria, a catalytic oxidation tank carrying a reticulated body composed of fibers, and a volcanic soil. Since it is a water quality improvement device consisting of a filled soil water purification tank, the photosynthetic bacteria useful as comprehensively immobilized microbial composition water quality improvement bacteria not only contribute directly to the purification and improvement of water quality, but also serve as a nutrient source for microorganisms. It contributes to activation of various pollutant-degrading bacteria, and as a result, improvement of water quality improvement efficiency can be achieved.

Further, by using the reticulate body made of fibers, it is easy to form a biofilm with a light weight, and since the porosity is large, clogging due to accumulated sludge is unlikely to occur, and even if it occurs, vibration is imparted and aeration is performed. As a result, sludge can be easily removed, and as a result, equipment maintenance and management becomes easier.

Furthermore, by combining a soil water purification tank filled with volcanic soil, it becomes easy to remove nutrient salts, especially phosphorus salts.

[0032]

EXAMPLES Next, the results of a water quality improvement (purification) experiment of river water using the water quality improvement apparatus according to the present invention will be described in detail.

Direct purification of river water was carried out using an apparatus in which the water quality improvement apparatus main body 1 of FIG. 1 and the soil water purification tank 7 of FIG.

[Specifications of water quality improving device] Width of the tank of the water quality improving device 1.0 m Total length of the tank of the water quality improving device 7.5 m Depth of the tank of the water quality improving device 1.2 m Length of 0.9m Length of microbial treatment tank of the same equipment 2.0m Length of catalytic oxidation tank of the same equipment 4.1m

The microbial treatment tank was filled with photosynthetic bacteria (Rhodopseudomonas capsulata, Rp. Capsulata) entrapped and immobilized in agar gel so that the culture carrier filling rate was 4%. In the contact oxidation tank, a fish net made of Polyester is attached to a metal frame (horizontal 990 mm x vertical 1000 mm), 5 cm.
79 sheets were installed at intervals so as to be orthogonal to the direction of water flow.

Further, a soil water purification tank having the following specifications shown in FIG. 2 is arranged on the downstream side of this apparatus, and the treated water (primary treated water) discharged from the water quality improvement apparatus main body is further treated with this soil water purification apparatus. The treated water was treated in a tank and the obtained treated water (secondary treated water) was discharged.

[Specifications of Soil Water Purification Tank] Width of soil water purification tank 1.0 m Width of soil water purification tank 4.5 m Depth of soil water tank 1.0 m Number of soil filling division tanks 4 Filling soil Red ball soil Large grain (particle size 10 ~ 15 mm)

Using this apparatus, the water quality improvement experiment was continued for 100 days. At the beginning of the experiment, after 40 days, after 70 days, and after 100 days, inflow water (raw water), water quality of treated water (primary treated water) exiting the main body 1, respectively,
Also, the water quality of the treated water (secondary treated water) discharged from the soil water purification tank 7 was investigated. The results are shown in Table 1 below.

In the table, BOD, SS, TN, T
-P means the following values, respectively, and is measured as follows. (1) BOD: Biochemical Oxygen Demand
gen Demand) Measured by the method specified in JIS K0102.21 (2) SS: Suspended Solids Measured by the method stipulated in "Attachment Table 9 of Notification No. 59" (3) TN: Total nitrogen content (Total Nitrogen) Measured by the method stipulated in "Notice 45.4" (4) TP: Total Phosphorus Measured by the method stipulated in "Notice 45.4"

[0040]

[Table 1]

As is clear from Table 1, according to the water quality improving device of the present invention, a remarkable water quality improving effect was exhibited, and stable performance could be exhibited over a long period of time.

[Brief description of drawings]

FIG. 1 is a perspective view of a water quality improvement device main body showing an embodiment of the present invention.

FIG. 2 is a sketch of a soil septic tank that is preferably installed on the downstream side of the water quality improvement device main body.

[Explanation of symbols]

 1 ... Water quality improvement device main body 2 ... Sand settling tank 3 ... Microbial treatment tank (bio tank) 4 ... Contact oxidation tank 4a ... Fiber mesh 5 ... Drop aeration tank 6 ... Discharge pipe 6a ... Discharge pipe 7 ... Soil water purification tank 8 ... Soil Filling division tank 9 ... Head aeration tank 10 ... Discharge pipe

Claims (5)

[Claims] 1. A microbial treatment tank carrying entrapping and fixing photosynthetic bacteria is provided on the raw water supply side, and a catalytic oxidation tank carrying a mesh composed of fibers is provided on the downstream side thereof, and raw water is sequentially supplied to these tanks. A water quality improvement device designed to improve water quality by passing it through. 2. The water quality improving device according to claim 1, wherein the reticulate body is a fishing net. 3. The water quality improving device according to claim 1, wherein the photosynthetic bacterium is a photosynthetic bacterium entrapped and fixed in an agar gel. 4. A soil water purification tank further filled with volcanic soil is provided on the downstream side of the apparatus according to claim 1, 2 or 3, and water passing through the microbial treatment tank and the contact oxidation tank is further added. A water quality improving device adapted to be treated in the soil water purification tank. 5. A water quality improving device provided with a sand settling tank upstream of the device according to claim 1, claim 2, or claim 3.