JPS6261696A - Fluidized bed type water treatment apparatus - Google Patents

Abstract

PURPOSE:To enhance treatment efficiency, by arranging an inner cylindrical pipe in a treatment tank and mounting an air diffusion pipe allowing air to flow in the inner cylindrical pipe in a bubble from and a carrier having specific gravity lower than that of flowing water. CONSTITUTION:Water to be treated is allowed to flow in a treatment tank 1 until reaching the upper end of an inner cylindrical pipe 2 and air is allowed to flow in said pipe 2 in a bubble form from an air diffusion pipe 3. Whereupon, air bubbles rise through the inner cylindrical pipe 2 to generate air lift pump action and a recirculation stream is generated. In this state, carriers 7 having specific gravity lower than that of water are thrown in the treatment tank 1 and bacteria are adhered to the surface of each carrier 7 to form a biofilm. By this method, the treatment of an org. substance and NH4-N by the biofilm is efficiently performed.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention relates to a fluidized bed water treatment device that biooxidizes organic matter and NH4-N in water using a microbial film grown on the surface of a carrier.

[Prior art and its problems]

Conventional fluidized bed water treatment equipment is, for example, disclosed in Japanese Patent Application Laid-Open No. 56-16
6989, a carrier such as sand, activated carbon, anthracite, etc., which has a specific gravity heavier than water, is made to flow in a tank, and organic matter in the water is mineralized by microorganisms that grow on the surface of the carrier. .

However, in this device, once the operation is stopped, the carrier settles, and the microbial film adhering to the surface of the carrier hardens the carrier particles to form a lumpy mud gall. Destroying this mud gall and reflowing it cannot be done with normal operation, and requires the addition of other equipment such as mixing water and air with an ejector, which makes the equipment complicated. There was a drawback.

Fluidized bed water treatment equipment has also been proposed that uses polystyrene, 4-riderobyrene, polyethylene, etc., which are lighter than water, as carriers (e.g., JP-A-56-78685). Fill the carrier with
The flow rate is adjusted to prevent the carrier from flowing out of the catalytic oxidation section and to ensure that the treated water contacts the carrier evenly and efficiently.

As a result, the operation becomes complicated, and the ratio of the amount of carrier packed to the capacity of the cypress is small, resulting in a large-sized device.

[Purpose of the invention]

This invention provides a fluidized bed water treatment device that uses floating carriers to solve the problem of mud gall formation, and that can flow the carriers throughout the tank with simple operation to improve treatment efficiency. It's something you're trying to gain.

[Structure of the invention]

This invention consists of an inner cylinder pipe disposed in a processing tank, an aeration pipe that causes bubble-like air to flow into the inner cylinder pipe to form a circulating flow inside and outside the inner cylinder pipe, and a diffuser pipe that flows with the circulating flow. This is a fluidized bed type water treatment equipment equipped with a carrier having a light specific gravity.

〔Example〕

The present invention will be explained below with reference to embodiments shown in FIGS. 1 to 3.

The water treatment apparatus shown in FIG. 1 is for treating wastewater, and has an inner cylindrical pipe 2 disposed at the center of a treatment tank 1, and an aeration pipe 3 disposed opposite the lower end of the inner cylindrical pipe 2. The treatment tank 1 has a cylindrical or square shape, and has a raw water inflow pipe 4 at the top and an outflow pipe 5 at the bottom.

The inner cylindrical tube 2 is supported at the center of the processing tank 1 at a predetermined distance from the top and bottom, respectively.

As shown in FIG. 3, a plurality of these inner cylindrical tubes 2 may be provided at symmetrical positions with respect to the cross section of the processing tank. The air diffuser 3 blows bubble-like air into the inner tube 2 using a blower 6 to form a circulating flow inside and outside the inner tube 2. Further, the treatment tank IP'3 is filled with a carrier 7 made of synthetic resin particles such as polystyrene, polypropylene, polyethylene, etc., which has a light specific gravity and is fluidized with the circulation flow.

In the above configuration, when treated water is allowed to flow into the treatment tank 1 until it reaches the upper end of the inner cylinder pipe 2 and air bubbles are introduced from the aeration pipe 3, the bubbles rise inside the inner cylinder pipe 2 as shown by arrow A. do. This causes an air lift pump action, and a circulating flow as shown by arrows B → C → 2 → E is generated inside and outside the inner cylinder pipe. In this state, carrier 7, which has a specific gravity lighter than water, is introduced and flows along with the circulating flow. As a result, microorganisms adhere to the surface of the carrier 7 and form a microbial film.

This microbial film efficiently removes organic matter and NH4-
N processing is performed.

〔Effect of the invention〕

According to this invention, since a carrier with a specific gravity lower than that of water is used, when the equipment is stopped, the floating sludge settles and the carrier floats to the surface, resulting in mud? - does not require any special equipment. Moreover, since the structure is such that the carrier is circulated, the amount of carrier input can be increased, and the carrier can be made to flow throughout the tank, thereby improving processing efficiency. Moreover, since there is no need for devices for starting the device and for making the water flow uniform, it is also possible to operate the system easily using a container or a motherboard.

The present invention can be used not only for wastewater but also for purifying raw water from tap water, etc. In this case, trace organic matter and NH4-N can be efficiently removed.

[Brief explanation of drawings]

Fig. 1 is a schematic side view of a fluidized bed water treatment apparatus showing one embodiment of the present invention, Fig. 2 is a cross-sectional view showing the installation of an inner cylinder pipe, and Fig. 3
The figure is a sectional view showing the installation of another inner cylinder tube. 1... Processing tank, 2... Inner cylinder pipe, 3... Diffusion pipe, 4
... Raw water inflow pipe, 5... Outflow pipe, 6... Prower,
7...Carrier.

Claims (1)

[Scope of Claims] An inner cylindrical pipe disposed within the processing tank; an aeration pipe that causes bubble-like air to flow into the inner cylindrical pipe to form a circulating flow inside and outside the inner cylindrical pipe; and an aeration pipe that flows along with this circulating flow. A fluidized bed water treatment device comprising a carrier having a specific gravity lighter than water.