JP2895724B2 - Water purification method in polluted water channel - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a water purification method for purifying water in a water channel through which polluted water flows, such as a drainage channel into which domestic wastewater flows, by directly applying a filter medium thereto.

[0002]

2. Description of the Related Art What is most desired for maintaining and improving a water quality environment is a measure at a position closer to a pollution source. From such a viewpoint, various types of methods for directly purifying a polluted water channel into which domestic wastewater flows are tried. As one form of such an attempt, a method of laying various types of filter media such as artificial turf-shaped filter media, gravel, or charcoal at the bottom of a polluted waterway has been implemented in various places (for example, a magazine "P
PM ”, August 1993, pp. 76-84 and September, 6
2-72).

[0003] The results of these trials vary because of factors such as the conditions and scale of the installation location, but all of them can be said in common. There is an advantage that it does not require, and because it can use the natural flow, it does not require operating expenses.On the other hand, the filter media spread at the bottom of the polluted water channel is clogged with earth and sand or sludge in a short time, and this clogging is Unless effective maintenance measures are taken, that is, frequent removal of earth and sand and sludge, it is difficult to achieve the intended purification capacity stably. In addition, the costs and personnel burdens required for such constant maintenance and management are heavily burdened on the respective implementing bodies, and as a result, the filter medium type polluted water channel purification method having the above advantages can be effectively utilized. It is a situation that could be.

[0004]

SUMMARY OF THE INVENTION The present invention has been made in view of the above circumstances, and relates to a method for purifying water in a polluted water channel using a filter medium. The method effectively prevents clogging of the filter medium due to earth and sand or sludge. The purpose is to be able to.

[0005]

For this purpose, the present invention relates to a method for purifying a water quality in which a filter material is applied to a polluted water channel to purify polluted water flowing through the polluted water channel. A filter medium block is formed, and the filter medium block is installed in a state of floating in a polluted water channel.

In this method, it is preferable to use a filter medium having a relatively low specific gravity, such as charcoal, as the filter medium. Also,
For the filter medium block to be in a floating state, for example, buoyancy is such that the surface of the filter medium block is slightly exposed on the water surface by attaching a plastic foam or cavity to the filter medium block as a float or mixing it into the filter medium. To give. Furthermore, in order to prevent the filter medium block in a floating state from flowing out, the filter medium block is moored with a suitable anchor, or a suitable weir is provided to stop the flow of the filter medium block.

[0007] The method of floating the filter medium block according to the present invention requires not only much less sediment deposition on the filter medium, but also much less sludge accumulation than the conventional method of laying the filter medium on the bottom. In addition, the method has a feature that the filter medium is extremely easily replaced because the filter medium is blocked and floated. Therefore, even when the accumulation of earth and sand or sludge progresses and the purification ability of the filter medium is reduced, it can be dealt with by replacing the filter medium. In addition, if a filter material that can be used as a fertilizer or soil improvement material such as charcoal is used as the filter material, the used filter material can be reused as a fertilizer or soil improvement material, and the cost burden of replacing the filter material is reduced. It is also possible to greatly reduce.

[0008]

[Experimental Examples] Experimental examples of the present invention will be described below. As shown in FIGS. 1 and 2, a filter medium block 2 is placed in a floating state at a certain interval in a drainage channel 1 near a residential area into which domestic wastewater flows.

The filter medium block 2 is formed so as to wrap a plastic foam 5 for buoyancy together with a filter medium 4 using charcoal in a cover 3 using a highly durable plastic net. The mixing amount is set so that the surface of the filter medium block 2 is slightly exposed above the water surface Wf. The filter medium block 2 is moored by the anchor 6 from the side wall of the drainage channel 1.

It is inevitable that the specific gravity of the filter medium block 2 gradually increases in accordance with the formation of a biofilm, the accumulation of earth and sand, and the like. This can be dealt with by adding an appropriate buoyancy material outside the filter material block 2.

[0011]

As described above, according to the present invention,
Since the filter media block is installed in a floating state in the polluted water channel, clogging of the filter media with soil and sludge can be effectively prevented, and the method of purifying the filter media type polluted water channel, which has many advantages, can be more effectively used. You can open your way.

[Brief description of the drawings]

FIG. 1 is a plan view of a drainage channel subjected to a water purification method according to the present invention.

FIG. 2 is a partial sectional view of the drainage channel of FIG.

[Explanation of symbols]

 Reference Signs List 1 drainage channel 2 filter material block 3 cover 4 filter material 5 plastic foam 6 anchor

Continuation of the front page (58) Field surveyed (Int.Cl. ⁶ , DB name) C02F 3/02-3/10 E02B 5/08 B01D 29/08

Claims (1)

(57) [Claims] 1. A method for purifying polluted water flowing in a polluted water channel by applying a filter material in the polluted water channel to form a filter material block filled with a filter material that can be used as a fertilizer or a soil improving material. A water purification method, wherein the filter medium block is installed in a state of being floated in a polluted water channel.