JPS60153988A - Method for deodorizing waste water from plant - Google Patents

Abstract

PURPOSE:To perform the deodorizing of waste water by simple work, by allowing waste water from a factory to pass a deodorizing tower so as to meander the same up and down along the weirs of said deodorizing tower while supplying fine air bubbles to said deodorizing tower from the bottom part thereof by a rotary drum to bring the same into contact with waste water. CONSTITUTION:Fine air bubbles injected from a rotary drum 8 rise in a deodorizing tower 1 while contact with factory waste water in said deodorizing tower 1. Because the factory waste water supplied into the deodorizing tower 1 is flowed from a chamber I toward a chamber IV while meandered in an up-and- down direction, factory waste water is countercurrently contacted with rising fine air bubbles in the chamber I and the chamber III. Because the waste water is concurrently contacted with rising fine air bubbles in the chamber II and the chamber IV, the contact time and contact degree of factory waste water and fine air bubbles are sufficiently held. Therefore, the greater part of an odorous component can be collected in air bubbles.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention is a method for deodorizing industrial wastewater, for example, wastewater generated in a pulp manufacturing process, and is aimed at factories that are easy to operate and can be deodorized at low cost. The object of the present invention is to provide a method for deodorizing wastewater.

Factory, IIJI water 1, e.g. generated in the pulp manufacturing process 4
, J1 water contains many reducing sulfur compounds such as hydrogen sulfide, mercaptans, alkyl sulfides, and disulfides, and if this wastewater is discharged as is, it will cause pollution problems due to bad odors.

Currently, these wastewaters are deodorized using a distillation column, but when a distillation column is used, (a) a large amount of steam is used.

(b) Because the malodorous components are concentrated, an odor will be generated in the event of a malfunction or other trouble.

() → Inspection and maintenance require a long period of time.

) Operation is complex and requires skill.

There are various drawbacks such as.

As a result of various studies on deodorization and removal using the above-mentioned conventional distillation column, the present invention aims to provide a method that is easy to operate and can deodorize wastewater at low cost by having the configuration described in the claims. was completed.

Specifically, the present invention deodorizes industrial wastewater by conducting the industrial wastewater in a meandering manner up and down along the weir of a deodorizing tower, and at the same time supplying fine air bubbles from the bottom of the deodorizing tower by a rotating drum to make contact with the wastewater. This is a method of deodorizing industrial wastewater that is characterized by

FIG. 1 shows one embodiment of the present invention. Next, the present invention will be explained with reference to an illustrated example.

The inside of the deodorizing tower 1 uses three partition walls 2, 3 and 4 as a weir,
The plane cross section is divided into approximately four equal parts.
Water is supplied to the factory from the supply port 5.

1) The partition wall 3 No. 11 is shaped like a weir of the deodorizing tower 1, and its lower edge is fixed to the bottom surface 6 of the deodorizing tower 1, and the other edge of the upper part is submerged in the drainage water inside the deodorizing tower 1, On the other hand, the partition walls 2 and 4 are located in the middle part of the deodorizing tower 1 in the shape of a weir, and are attached to the inner wall surface (=J), so that the inside of the deodorizing tower 1 is connected to the partition wall 2,
3 and 4 are divided into rooms f+), (11), (III and 6V), and rooms (1) and (11), and rooms Q10 and Q■ are divided into rooms f+), (11), (III and 6V) by partition walls 2 and 4, respectively.
The chambers (11) and (110) are still connected to each other through the -1 part of the partition wall 3. 2 to 4 sequentially meander downward through the chambers (I) to fIM and are discharged from the drain lower.

On the other hand, microbubbles are supplied into the factory wastewater from rotating drums 8, 8 which are largely attached to the lower communicating parts of the partition walls 2 and 4.

As shown in FIGS. 3 and 4, the rotating drum 8 has several double-sided small cylindrical bodies 9 radially arranged on the outer peripheral surface of the rotating drum 8, so that the gas supplied from the rotating shaft 10 can be Microbubbles are formed from the vent holes 11 of the small cylindrical body 9 and are supplied to the factory wastewater inside the deodorizing tower 1.

The microbubbles ejected from the rotating drum 8 come into contact with the factory wastewater inside the deodorizing tower 1 and rise.

According to the present invention, the industrial wastewater supplied to the inside of the deodorizing tower 1 flows in a meandering manner in the vertical direction in the (1) chamber to (11) chamber. In this case, the factory wastewater is in countercurrent contact with the rising microbubbles, and in the (II) chamber and the 6vl room, it is in cocurrent contact with the rising microbubbles, so the contact time between the factory wastewater and the microbubbles is A sufficient degree of contact is maintained so that most of the odor components can be trapped in the bubbles.

From the results of research by the inventors, the rotating drum has a rotation speed of 80 rpm.
．． ．． 000 rpm, gas supply iii: (G/L) 20 or more, and if the residence time of the industrial wastewater in the absorption tower 1 is at least 10 minutes, odor components above 90% can be recovered. can do.

In FIGS. 1 and 2, the inside of the deodorizing tower 1 is divided into four equal sections by the partition walls 2 to 4, and the
8 can be installed in the deodorizing tower 1, but the present invention is not limited to these in any way, and the number of partition walls can be further increased. , 8 can be set to 3 or more, but repeated meandering during water utilization will make the retention time of drainage longer than necessary;
Furthermore, since the deodorizing tower 1 is also large-sized, it is desirable to divide the inside of the deodorizing tower 1 into four equal parts as shown in FIGS. 1 and 2, thereby achieving sufficient deodorization as in the embodiments described below.

In addition, in the examples described later, t
Although it is el water, it is not limited to this, and can of course also be applied to deodorizing various other types of industrial wastewater.

In addition, the present invention does not require a step of concentrating odor components like a distillation column, and does not require steam, so the treatment operation is simple, and the equipment is simple, so repair is easy. It can be installed at each factory (for example, at each high-quality paper mill or kraft paper mill in the pulp manufacturing process), and can ensure thorough deodorization treatment of listed wastewater.Therefore, it can greatly reduce the problem of pollution caused by odorous wastewater. Costs can be kept low.

Examples Various wastewater discharged from kraft pulp mills and high-quality paper mills (exhaust gas cooling tower drain, tarpe/chindre/, eholator surface con 7' No+J--Treno,
Various types of drainage (e.g., evaporator drain, evaporator vacuum pump drain, kiln explosion-proof pit drain, and Guijester dust catcher drain) are shown in Figures 1 and 2.
The other side is supplied from the supply port of the deodorizing tower 1 as shown in the figure.

The rotary drums 8, 8 are rotated to supply air in the form of microbubbles during drainage. In this case, the test was carried out on two wastewaters with different concentrations of odor components, and the results were as shown in Tables 1 and 2, respectively.

Table 1 (Note) (1) One-side stop means that only one of the two rotating trams in the absorption tower is in operation.9 Both-side operation means that two rotating drums are in operation.

(21TR5 is total reducible sulfur.

-1-1.2 As is clear from the results in Table 1, TR in the stock solution (wastewater)
5 is 9.053 ppm, if G/L=30, the sous 5 gas component removal rate can be 92.2 qb by operating one of the two rotary drums 11, and G /Iy-
J+, which operates two rotary trams at 60°C, can remove odor components at a rate of 98.7%.

In addition, as shown in Table 2, 'l''R3 of the stock solution] 0.665
At 11pH1, the odor component removal rate is about 88.1ch when G/I is 15 and one side is stopped, but when G/L is 30, it is 2
If the rotary drum is operated, the odor component removal rate will be 95.5.
You can improve your skills.

[Brief explanation of the drawing]

FIG. 1 is an explanatory diagram of an example of a device for carrying out the present invention;
Figure 2 shows 11 in Figure 1. - A schematic cross-sectional view taken along the line II, FIG. 3 is a perspective view of an example of a rotating drum, and FIG.
It is a sectional view taken along the line IV. 1: Deodorizing tower, 2, 3, 4: Partition wall, 5: Supply 1.6: Bottom, 7: Loss 1'', 8° rotating drum, 9: Small cylinder, 10
° Rotation axis, 11: Ventilation hole. Patent applicant Oji Paper Co., Ltd. Agent Rikichi Ichikawa

Claims (1)

[Claims] In deodorizing factory U1 water, the factory wastewater is conducted in a meandering manner up and down along the weir of the deodorizing tower, and fine air bubbles are supplied from the bottom of the deodorizing tower by a rotating drum to bring them into contact with the water supply. A method for deodorizing factory wastewater.