JPH0286892A - Special biological treatment equipment for service water and waste water - Google Patents

Abstract

PURPOSE:To stably reduce BOD, etc., of service water and waste water such as bath water by forming a water passage in a central part of a packed layer packed with calcined naturally yielded porous diatomaceous earth mineral consisting primarily of SiO2 as filter medium and inserting an ultraviolet lamp into the water passage. CONSTITUTION:A packed layer 7 packed with calcined naturally yielded porous diatomaceous earth mineral (crystobalite) consisting primarily of SiO2, pref. a mixture of coral sand with zeolite, as filter medium is formed on a separating wall 2 in a vessel 1. Further, a water passing pipe 9 is inserted into a central part of the packed layer 7, and an ultraviolet lamp 11 is inserted into the water passage pipe 9. Service water and waste water to be treated is introduced into a chamber 3, then passes through the packed layer 7. Since a microorganism film is formed on the surface of the particles of the filter medium in this stage, the service water and the waste water contacts with the microorganisms film while it passes through the packed layer 7, and urea, org. substances, etc., in the water are decomposed. The service water or the waste water having been treated with the microorganisms, is then introduced into the water passage pipe 9 through a water feeding ports 9a..., and living bacteria, etc., are sterilized while the flow of the waste water rises along the ultraviolet lamp 11 by the irradiation with ultraviolet rays. Thus, the propagation of saprophytes, etc., is inhibited. The treating capacity of the microorganisms is durable for a long time without causing deterioration.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a microbial treatment device for wastewater such as pond water, bathtub water, seawater, garden water, pool water, and the like.

(Prior Art) Conventional methods for purifying industrial wastewater generally include sand filtration, activated carbon filtration, and Method 7, which combines filter filtration with chemical sterilization such as chlorine.

However, with this method, there is a limit to how much organic matter, urea, ammonia, etc. contained in industrial wastewater can be adsorbed onto activated carbon. Furthermore, activated carbon adsorption cannot be used for long periods of time.

In addition, chemical treatment such as chlorine dissolves chlorine in the treated water, which poses a problem in terms of its effect on the human body.

On the other hand, the chemical composition of a fired product (trade name: CRYSBALT) of natural porous diatomaceous earth mineral (Crisbart) whose main component is silicate SiO□ is as follows.
It has different characteristics from existing adsorbents such as activated carbon, zeolite, and Seviolite.

Table 1 Chemical composition of Crisbarite The main characteristics of this fired Crisbarite product are (1)
Pore diameter 15~2°, specific surface area 110~130m2/
g porous material, (2) porosity 40-50%, apparent specific gravity 1.2, hydrophilic, (3) strongly adsorbs ammonia and protein in gaseous or water, (4) Pi microorganisms. Examples include adhesion.

Among these, especially regarding the microbial adhesion performance, we focused on calcined cristalite (
The results of media performance tests using (trade name: Crisbar), activated carbon, filter sand, and allophane are shown in Sections 2 to 2 below.
As shown in Table 4, it is clear that when cristalite fired products are used as a medium, the amount is 530.6 mg/g (per unit volume: 366, 1 mg/1 TIil, which is an extremely larger value than other media). , indicating that it is an excellent material as a medium for microorganisms.

Attempts have been made to perform microbial treatment of industrial wastewater by utilizing the excellent properties of fired Risparite as a microbial medium.

(Problems to be Solved by the Invention) However, when carrying out microbial treatment of industrial wastewater using a microbial treatment device using a fired cristalite product as a filter material, the fifth
As shown in the table, BOD and COD stably decrease from 15 to 50 days after the start of treatment, and transmittance also increases, but after 50 days, the decrease in Bob) and COD stops. There is also a tendency for the transmittance to decrease.

This is because when microorganisms adhere to the burned cristalite products, they multiply actively and become aerobic, the BOD and COD of the industrial wastewater steadily decrease, and the permeability of the industrial wastewater increases, but around 50 days after the start of treatment. More bacteria grow and propagate, which inhibits the growth of microorganisms that adhere to the fired product.Furthermore, the reduction of BOD and COD stops due to the shedding of waste microorganisms due to metabolism, and the permeability of industrial wastewater decreases. Presumed.

Table 2 Amount of microorganisms adsorbed in the medium Table 3 Ratio of adsorbed microorganisms Table 4 Microorganisms propagated on Crisbar medium Table 5 Water temperature: 42°C However, the shedding of microorganisms can be alleviated to some extent by supplementing with oxygen and enzymes. However, the supplementation of oxygen and enzymes is not sufficient to kill or eliminate bacteria that inhibit the growth of microorganisms.

In addition, when disinfecting or sterilizing by adding a disinfectant such as chlorine, the disinfectant dissolves in the water to be treated, which kills not only the target bacteria but also the microorganisms in the microbial treatment equipment. , -M cannot be treated with fungicides such as those used in M.

(Means for Solving the Problems) In order to solve the above problems, in this invention, a water passage is formed in the center of a packed bed using a fired cristalite product as a filter material, and an ultraviolet lamp is installed in the water passage. The present invention proposes a microbial treatment device for industrial wastewater. Examples of the industrial wastewater to be treated in the invention include pond water, bathtub water, seawater, garden water, pool water, etc. The wastewater to be treated is treated by circulating water through the microbial treatment apparatus according to the present invention.

Further, in order to improve the treatment efficiency within the microbial treatment device, the temperature of the wastewater to be treated is appropriately from room temperature to about 50°C.

Further, as the fired cristalite product, a granular or pellet-shaped molded product can be used as a filter medium.

In the present invention, it is preferable that the ultraviolet lamp be one that generates ultraviolet light having a wavelength of about 230 to 270 nm, for example.

(Function) That is, when the microbial treatment device according to the present invention is used to treat domestic wastewater such as pool water and bathtub water, the domestic wastewater to be treated is sent into a packed bed using a calcined cristalite product as a filter material. By contacting the fine particles formed on the surface of the fired cristalite product, the ammonia in the wastewater is removed.
Urea, organic matter, etc. are decomposed by microorganisms. Furthermore, this treated water is sent to a water passage formed in the center of the packed bed,
As the water passes through this area, it is irradiated with ultraviolet rays from a lamp, and the living bacteria contained in the wastewater are sterilized or sterilized.

Therefore, according to the present invention, bacteria contained in industrial wastewater are sterilized or sterilized when it passes through the packed bed using the fired cristalite product as a filter medium, so even after long-term operation, the surface of the fired cristalite product remains intact. The growth of microorganisms attached to the surface is not inhibited by bacteria. Therefore, BOD and COD in industrial wastewater can be stably reduced, and the permeability can be increased.

In addition, this invention uses ultraviolet rays to sterilize bacteria that enter the waste water, and does not use chemicals such as chlorine, so it does not kill microorganisms that adhere to and reproduce on the surface of fired cristalite products. There isn't.

Furthermore, the microbial treatment device of the present invention is constructed by inserting an ultraviolet lamp into a passageway formed in the center of a packed bed using calcined cristalite as a filter material, so the volume of the device can be reduced and the device can be easily used. It can be used as a wastewater treatment device.

(Example) The present invention will be explained below based on illustrated embodiments.

FIG. 1 shows a microbial treatment device showing an embodiment of the present invention, in which an introduction chamber 3 for wastewater to be treated is provided at the bottom of a cylindrical device container 1, which is partitioned by a water-permeable partition wall 2. A water supply port 4 for water to be treated is provided at the side of the introduction chamber 3, and a drain port 5 is provided at the bottom thereof. Further, the upper part of the container 1 is sealed with a flange 6, and a filling layer 7 is provided on the partition wall 2 inside the container 1, using a fired cristalite product (trade name: CRYSBARL) as a filter material. Note that the filling layer 7 is partitioned into an external filling layer 7a and an internal filling layer 7b by a partition plate 8 provided in the vertical direction. On the other hand, a stainless steel water pipe 9 is inserted into the center of the packed bed 7 and has a plurality of water supply ports 9a, . Ultraviolet lamp 11 equipped with
is inserted, and a drain port 12 is further provided at the upper end of the water pipe 9.

In the above configuration, wastewater to be treated is introduced into the chamber 3 through the water supply port 4, and further passes through the outer packed bed 7a and then the inner packed bed 7b. Here, a microbial film that decomposes ammonia, urea, and organic matter contained in the wastewater is formed on the surface of the Crisbar particles constituting the packed bed 7, and therefore, while the wastewater passes through the packed bed 7, Then, ammonia, urea, organic matter, etc. are decomposed by contact with the microbial film formed on the surface of these Crisbar particles.

The wastewater that has undergone microbial treatment is supplied to multiple water supply ports 9a,...
- is introduced into the water pipe 9, and while rising inside the water pipe 9 along the ultraviolet lamp 11, the living bacteria are irradiated with ultraviolet rays and are sterilized. Thereafter, the treated water discharged from the drain port 12 is circulated through the apparatus again and the same treatment operation as described above is performed.

As described above, the microbial treatment and sterilization of the water to be treated are carried out. However, in this invention, the sterilization treatment is carried out using ultraviolet rays, so it does not have the same effect on the microorganisms that propagate within the packed bed. Bacteria contained in treated water can be sterilized. Therefore, even if the processing device according to the present invention is used for a long period of time, the BOD and C
Without stopping the decrease in OD and reducing the transmittance, it is possible to stably decrease BOD and COD and increase the transmittance.

(Effects of the Invention) In summary, according to the present invention, ammonia, urea, organic matter, etc. contained in industrial wastewater are decomposed by microorganisms, and at the same time, various bacteria etc. mixed in the microbial treatment equipment are treated by microorganisms by ultraviolet treatment. Effective sterilization can be performed without adversely affecting the microorganisms that proliferate within the device.

Therefore, according to the present invention, the decrease in BO, D, and COD does not stop and the permeability does not decrease when operated for a long period of time, unlike conventional microbial treatment equipment, and BOD
, a stable reduction in COD and an increase in permeability can be achieved.

Furthermore, the microbial treatment device of the present invention is constructed by inserting an ultraviolet lamp into a passageway formed in the center of a packed bed using calcined cristalite as a filter material, so the volume of the device can be reduced and the device can be easily used. It can be used as a wastewater treatment device.

[Brief explanation of the drawing]

FIG. 1 is a longitudinal sectional side view showing an example of a microbial treatment device for industrial wastewater according to the present invention. In the figure, 7 is a packed bed using a fired cristalite product as a filter medium;
9 is a water pipe, 11 is an ultraviolet lamp. Patent Applicant: Riser-Egyo Co., Ltd. Agent: Patent Attorney: Japan and China Akio Teitouri Ne...Author (spontaneous) March 10, 1989

Claims (1)

[Claims] A water passage is formed in the center of a packed bed using a filter material made of a calcined natural porous diatomaceous earth mineral whose main component is SiO_2 silicate, and an ultraviolet lamp is inserted into the water passage. Microbial treatment equipment for wastewater.