JPH10277598A - Dehydrated sludge weight reducing material of activated sludge type waste water sewage treatment plant by photocatalyst of titanium dioxide - Google Patents

Abstract

PROBLEM TO BE SOLVED: To reduce the quantity of dehydrated sludge by oxidatively decomposing an org. matter, hardly decomposable harmful chemical substance and a microorganism group from an activated sludge tank within a sewage/waste water treatment plant and again using decomposed matter as feed of the aerobic microorganism group in the activated sludge tank. SOLUTION: Liquidized titanium dioxide is adhered to transparent glass, plastic or ceranaic and a flexible film sufficiently corresponding to the movement of water to produce an apparatus wherein the photocatalytic capacity of titanium dioxide is sufficiently put to practical use and this apparatus is arranged at a proper place of a activated sludge type waste water and sewage treatment plant and, when photocatalytic effect, that is, titanium dioxide is irradiated with light, oxidizing power very strong as compared with ozone or chlorine is generated to oxidatively decompose a substance coming into contact with the apparatus not only to decompose org. matter or a hardly decomposable harmful chemical substance but also microorganisms and decomposed matter becomes feed of an aerobic microorganism group in the activated sludge tank and excessive sludge is perfectly decomposed and water is held within a water quality standard value to flow out to rivers as final treated water.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION The present invention relates to a method in which liquefied titanium dioxide is adhered to transparent glass, plastic, ceramic, or a soft film that can sufficiently cope with the movement of water, and the like, which makes full use of the photocatalytic ability of titanium dioxide. ,
Installed in an appropriate place of activated sludge wastewater or sewage treatment plant to demonstrate the ability of titanium dioxide photocatalyst to decompose and oxidize organic substances, chlorine, blue, algae, mold, etc. It also enables the disposal of harmful chemicals. Then, the amount of dewatered sludge flowing out or carried out is reduced, and the operation cost of the wastewater / sewage treatment plant is reduced, and environmental destruction is prevented.

[0002]

2. Description of the Related Art Wastewater and sewage treatment plants using activated sludge methods generally used at present are mainly operated to breed aerobic microorganisms and maintain MLSS, SS, BOD, COD, etc. in a sludge tank at a constant level. ing. When the operating capacity in the wastewater / sewage treatment plant is exceeded, the sludge is drained to maintain the activated sludge liquid balance in the treatment plant. The drained sludge is dewatered and carried out by industrial waste companies. The local government or each private company pays a ton per ton for the export according to the amount of the export. Unless improvements are made to the facilities in the future, the amount of exports will tend to increase. For this reason, the national sewerage corporation is currently conducting experiments using ozone sterilization to enable complete dehydration of dewatered sludge. Although the possibility is sufficient, capital investment is high and running costs are high, so it can be implemented in a standard activated sludge treatment plant, but it is a small-scale treatment plant with an oxidation ditch method, batch method, and anaerobic treatment. It is considered difficult to implement this method using a floor detonation type contact explosive method. However, for the global environment,
After discussions in countries around the world, the environmental ISO was launched in September last year based on BS7750, and regulations became more stringent.
In four years, a ban on marine dumping was announced worldwide. At present, 90% of sludge is dumped into the sea, so this is an issue that must be overcome in the future.

[0003]

SUMMARY OF THE INVENTION According to the present invention, the facility can be operated as it is, with little improvement, and the running cost can be reduced. It is possible to reduce and control the amount of dewatered sludge to be carried out without changing much, and to sufficiently reduce the water and environmental purification and operation costs of the facility.

[0004]

The liquefied titanium dioxide is adhered to transparent glass, plastic, ceramic, or a soft film that can sufficiently cope with the movement of water, and a device that makes full use of the photocatalytic ability of titanium dioxide is manufactured. ,
When installed in an appropriate place of activated sludge wastewater or sewage treatment plant, and illuminate the photocatalytic effect, i.e., titanium dioxide,
Very strong oxidizing power is generated compared to ozone and chlorine, and it oxidizes and decomposes substances that come in contact with it, decomposes not only organic matter and persistent harmful chemicals but also microorganisms, and aerobic microorganisms in the activated sludge tank. Surplus sludge is completely decomposed and kept within the water quality standard value, and is discharged to the river as end-treated water. Since this equipment is maintenance-free in principle, there is no hindrance to the operation of the treatment plant, and since the equipment is simple, there are few failures and the handling is easy. It should be noted that by making full use of the sun's rays, an ultraviolet lamp is installed as an auxiliary device, and operation will not be hindered if prepared in case.

[0005]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A liquefied titanium dioxide is adhered to a transparent glass, plastic, ceramic or a soft film which can sufficiently cope with the movement of water, etc., and an apparatus which makes full use of the photocatalytic ability of titanium dioxide is manufactured. It is installed at an appropriate place in a sludge type wastewater or sewage treatment plant, and the photocatalytic effect of titanium dioxide is exhibited to enable the complete elimination of dehydrated sludge.

[0006]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The wastewater in the sewage or wastewater treatment plant should be installed at an appropriate place so that the sewage in the treatment plant comes in contact with the titanium dioxide, and sufficient care should be taken to ensure that the sunlight is sufficiently absorbed.

[0007]

As described above, the action of the titanium dioxide of the present invention oxidizes and decomposes microorganisms, organic substances, and hardly decomposable harmful chemicals from inside the activated sludge tank, thereby enabling sludge to be reduced in weight and deodorizing. It also reduces the occurrence of algae and mold and contributes to the reduction of operating costs.

──────────────────────────────────────────────────続 き Continued on the front page (51) Int.Cl. ⁶ Identification code FI C02F 3/12 C02F 3/12 Z

Claims (1)

[Claims] (1) A method for converting liquefied titanium dioxide into transparent glass
Adhering to plastics, ceramics, and soft films that sufficiently respond to the movement of water, and promoting the reduction of dewatered sludge in activated sludge wastewater or sewage treatment plants using the photocatalytic ability of titanium dioxide.