JPS6171888A - Treatment of water with ozone - Google Patents

Abstract

PURPOSE:To reduce cost, by forming ozonized air by enhancing the concn. of oxygen in air by a high-molecular oxygen enriching membrane and performing the treatment of water by using ozonized air. CONSTITUTION:Air sucked by an air source blower 7 passes through an ozygen enriching apparatus 8 to be converted to oxygen enriched air which is, in turn, passed through an ozone generator 5 through a pretreatment apparatus 6 to form high conc. ozonized air. This ozonized air is blown into a reaction tank 7 to enhance the ozone absorbing efficiency of excretion treated water 2. As the oxygen enriching membrane, one formed of a silicone, polycarbonate or polystyrene type high-molecular material is used.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention relates to a water treatment method for clean water, commercial water, sewage, human waste, industrial wastewater, etc., using inexpensively produced ozone.

[Conventional technology]

Industrial ozone generators currently in use use a silent discharge method, and generally use air as a raw material.

In a special case, oxygen may be used as a raw material, and in this case, the power required to generate ozone will be A-A. Also,
Oxygen supply methods include the use of liquid oxygen and the adsorption method using adsorbents such as molecular sheep (hereinafter referred to as "
PSA method (abbreviated as “PSA method”) is common.

[Problem that the invention seeks to solve]

The conventional ozone generation system for water treatment using ozone is (il).
The equipment cost is low, but the ozone produced is low (usually 10 to 1
(Used at 2J/N), water treatment #C has low ozone absorption efficiency.

(11) In an ozone generation system using oxygen,
Compared to when air is used, the discharge force per unit of ozone generation is less than %, and the ozone absorption efficiency in water treatment can be maintained at a high level due to the high degree of generated ozone, but the oxygen generator is extremely expensive. , the energy required to generate oxygen is also large.

For example, in the case of the PSA method, the equipment cost is almost the same as that of an ozone generator, and the power consumption is also the same or more than when generating ozone.

Furthermore, the method of using a liquid element as an oxygen source is difficult to apply when a large amount of ozone is used, such as in water treatment.

The present invention solves the above conventional problems, adopts an ozone generation method suitable for water treatment, maintains high ozone absorption efficiency in water treatment, and significantly reduces equipment costs, running costs, etc. of the entire water treatment facility. This is what we are trying to reduce.

[Means to resolve the problem]

The present invention increases the oxygen concentration in the air using a polymeric oxygen-enriching membrane, uses the obtained oxygen-enriched air as a raw material to generate highly ozonized air, and uses the ozonized air to perform water treatment. It is characterized by the fact that

[Embodiment] An embodiment of the present invention will be described with reference to the drawings as an example of advanced human waste treatment. In FIG. This is a reaction tank in which the reaction is carried out by blowing in water. 3 indicates treated water and 4 indicates exhausted ozone. The ozone generating equipment connected to the bottom of the reaction tank 1 is equipped with a pre-treatment device 6 for dehumidification, cooling, etc. and an air source blower 7, and the suction side of the air source blower has a high permselectivity for oxygen. An oxygen enrichment device 8 equipped with an oxygen enrichment membrane made of a polymeric material is installed.

Therefore, the air sucked in by the air source blower 7 is
First, the air is made into oxygen-enriched air by passing through an oxygen enrichment device 8, and then passes through a pretreatment device 6 to an ozone generator 6.
By generating highly concentrated ozonized air and blowing it into the reaction tank 1, the ozone absorption efficiency of the tertiary human waste water 2 is increased, and effective treatment is performed.

The oxygen-enriched air obtained by the oxygen enrichment device 8 at this time is
Practically, it is preferable to set the oxygen concentration to about 25 to 60%, and the ozone generator S generates ozonized air with a high degree of mystery of 10 to 40 II/Nu'.

The oxygen enrichment membrane made of a polymeric material with high permselectivity for oxygen used in the oxygen enrichment device 8 may be silicone-based, I-recarbonate-based, polystyrene-based, polyethylene-based, nylon-based, or cellulose acetate-based. , ethyl cellulose-based, methyl rubber-based, butyl rubber-based, etc., and there are suction type mainly used for flat membranes (as shown in the first example shown in the figure, there is a pressurized type installed on the suction side of the air source blower 7) and pressurized type mainly used for hollow fiber membranes. (installed on the discharge side of the air source blower 7).

The oxygen-enriched membrane method using these permselective membranes can produce large amounts of oxygen-enriched air with an oxygen concentration of 25 to 60% at low cost, and compared to the PSA method, it is several times cheaper in terms of equipment costs. As shown in FIG. 2, the power cost can be reduced by more than a factor of 1, for example, to obtain 30% oxygen-enriched air.

In addition, since the oxygen enrichment membrane can increase the oxygen partial pressure in the raw air, the ozone generated by the ozone generator
Stables get taller. For example, if the oxygen concentration of the raw air is 25 to 6
By setting it to 0%, it is possible to create ozonized air with a high ozone concentration of 10 to 409/Ntrl. In this way, by increasing the amount of ozone supplied, the ozone absorption efficiency, which affects water treatment, can be increased. That is,
Figure 3 is an example of water treatment (ozone injection rate 3'II9/l)
and the supply ozone concentration is 1 (1/N□1 to 30ji
/H,l, the ozone absorption efficiency is 75%.
It increases from about 90% to almost 90%.

Furthermore, the following table shows that in the embodiment of the present invention shown in FIG.
This figure shows how advantageous the present invention is by comparing costs when the same treatment effect as that of the conventional method is obtained.

Margins below [Effects of the Invention] As stated above, the present invention converts the raw material air supplied to the ozone generator into oxygen-enriched air using an inexpensive polymeric oxygen-enriched membrane, and uses this as the raw material to generate ozone. Since it is used for water treatment, it not only improves the generated ozone concentration and ozone absorption efficiency compared to conventional air-based ozone generation systems, but also significantly reduces the equipment costs and running costs of the ozone generation equipment and the water treatment equipment as a whole. This has many beneficial effects, such as reducing the amount of water used.

[Brief explanation of the drawing]

FIG. 1 is a system explanatory diagram showing one embodiment of the present invention, and FIG. 2 is a diagram showing the relationship between the amount of oxygen-enriched air and the produced power.
FIG. 3 is a diagram showing the relationship between supplied ozone concentration and ozone absorption efficiency. l... Reactive species, 2... Human waste tertiary treated water, 3... Treated water, 4... Exhaust ozone, 5
. . . Ozone generator, 6 . . . Pretreatment device, 7. Air source blower 18 . . . Oxygen enrichment device.

Claims (1)

[Claims] 1. Increase the oxygen concentration in the air with a polymeric oxygen-enriching membrane, use the obtained oxygen-enriched air as a raw material to generate highly concentrated ozonized air, and use the ozonized air as a raw material. A water treatment method using ozone. 2. The water treatment method using ozone according to claim 1, wherein the oxygen concentration of the oxygen-enriched air is adjusted to 25 to 60%.