JPS6295196A - Contact oxidation biological filter device - Google Patents

Abstract

PURPOSE:To improve treating capacity by providing a cylindrical partition plate having a perforated part in the upper part to the center of a treatment tank which has a funnel-shape bottom and is provided with a perforated plate in the upper part of the funnel, supplying water to be treated and air to the partition plate and packing contact filter media in the treatment tank. CONSTITUTION:The cylindrical partition plate 4 having the perforated part 3 in the upper part is provided to the center of the treatment tank 1 which has the funnel-shape bottom and is provided with the perforated plate 2 in the upper part of the funnel. A discharge port 10 of a nozzle 6 for injecting air-liquid mixed water to be treated which supplies pressure-fed water 8 to be treated and air 7 from an air intake pipe 5 is provided to the plate 4. The small piece meshed contact filter media 11 made of a synthetic resin having the specific gravity equal to the specific gravity of water or slightly lower than the same are packed in an adequate amt. into the tank 1. An injection nozzle 17 for cleaning the contact filter media 11 is further installed in the tank 1. As a result, the treating capacity is improved and since the implantation, hypertrophy, exfoliation and desorption of microorganisms are alternately executed with good balance at all times in the various parts of the contact filter media, stable treated water is always available.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention provides effective immersion filter bed contact for low-concentration wastewater mainly used for circulation filtration of ornamental ponds, garden ponds, park ponds, fish ponds, fishing ponds, live fish cages, fishing bait cages, etc. It is an oxidizing biological filtration device.

I for circulating filtration of conventional garden ponds, seawater and freshwater live fish cages
Sand, crushed stone, activated carbon, shells, etc. are used as filter media, but sand has a low porosity, and due to organic contamination, clogging occurs in a short period of time, and frequent backwashing is required, resulting in a large amount of waste. This requires a lot of power and causes mutual friction, leaving little room for biological implantation.

Pebbles and crushed stones are heavy and have low porosity, so only the surface of the stone is effective, and the inside of the stone is useless for water treatment, and the waterway does not expand or change due to water flow or water pressure, and blockages are likely to occur. Shells are attacked by organic acids during water treatment, resulting in crushing and crushing. Activated carbon becomes severely clogged and must be periodically regenerated or replaced, and all materials must be constantly backwashed. It is like producing concentrated backwash wastewater, which requires powerful high-pressure water.
This cannot be called energy saving.

The present invention uses a flat mesh short tube (Fig. 3) made of a resin that is slightly lighter than water and has a side of 2 to 7 cm square and a thickness of 0.3 to 1 cm as a contact filter medium. The thickness of the wire of the net is 05.
~1 mm, with a mesh size of 2 to 10 mm.

It also captures many young children and produces treated water that is clearer than sand filtration.

The resin flat short tube contact filter medium is optimally made of hard polyethylene resin with a specific gravity of (0.95 to 0.97), and is an inexpensive mass-produced product by extrusion molding.

The size of the filter medium and the size of the mesh are selected depending on the type of water to be treated, and for ponds where feed is applied, such as fish ponds, where the pollution load is relatively large, filters with large meshes are selected, and for live fish that are not fed with feed. For those with a low pollution load, such as farming cages, filter media with a small mesh size are used, and the shape of the flat small pieces and short tubes is designed to accommodate a large number of fish per unit volume, that is, to increase the contact area. be.

The location can be changed and the cleaning can be done by stirring.

The contact area of the filter media is effective if it covers the entire area surrounding the strands of the net, and the more living organisms adhere to the strands, the more the contact area increases, and the larger the absolute number of biomass, the more effective the treatment. Your abilities will improve.

Since the filter media is a net, water can pass in any direction in all directions, and where the water flows through well, animal microorganisms breed well and the filters become clogged quickly, but if they become clogged, the water flows in other directions. Since the water flow is no longer flowing to the clogged area, neither oxygen nor nutrients are carried in. Living organisms and substances ride the water flow and reach the next contact filter media and settle there.The waste sludge that cannot be deposited is sequentially transferred to the contact filter media. The flocs are transported downward by the circulating water current, and as they are being transported, the flocs grow and become larger clumps, and microorganisms are alternately enlarged and exfoliated in a well-balanced manner throughout the filter media in contact with the treatment. The number of times of backwashing is reduced to a few tenths of that of conventional equipment, and even after thorough cleaning, microbial seeds remain somewhere in the strands of the mesh filter material, and countless waterways open when water is passed through. sludge is obtained, reproduces instantly, stands up quickly, and is always stable.The digestion of sludge progresses, excess sludge is dramatically reduced, and blue-green algae, etc. that occur in ponds etc. are also captured and adsorbed by the filter medium, resulting in high Because it is eaten by multicellular organisms such as rotifers and daphnia, it always remains clear.

To explain this device while following the drawings, there is a processing tank (L) with a funnel-shaped bottom, (1) a perforated plate (2) above the funnel, (
2) in the center of the treatment tank (1), and the upper part has a perforated part (
3) Cylindrical partition plates (4), (4) with (3)
and a water injection nozzle (6) having an air suction pipe (5) i5) slightly below the center of the partition plate (4).
, (6) upward discharge ports (10) (10) of gas-liquid mixed jet water (9) of intake air (7) and water to be treated (8)
This is a device in which contact filter media (marked (11)) are filled on the outside of the partition plate (4) and inside the processing tank (1).

The water to be treated (8) sent by the pump is jetted out from the water injection nozzle (6), but the area around this nozzle (6) is under reduced pressure, and the water is guided through the air suction pipe (5). A large amount of air (7) is sucked in, small air bubbles are mixed into the jet water (9), and the air bubbles rise and the jet water flows countercurrently (12).
) generates circulating water flows (13), (13), which undergo biological oxidation contact treatment when passing through the contact filter medium (11).

Conventional filtration equipment only pumps the water into the treatment tank, but the device of the present invention utilizes the pumping energy required to supply the water to be treated, performs aeration with a one-way ejector, and increases the air lift due to the rise of bubbles and the upward movement of the injected water. flow (12)
A large amount of circulating water flow (13) is generated by the contact filter medium (
This is a biological oxidation energy saving device that increases the contact efficiency of 11) and provides aeration as well as supply of water to be treated.

The pressure-fed treated water (
8) sucks air (7) from the air suction pipe (5), turns it into mixed air jet water (9) containing fine air bubbles, and sends it to the discharge port (10).
It is discharged from the upper perforated part (
3) move to the side where the filter medium (11) is immersed;
forming a circulating water flow (13) and a treated water outlet perforated pipe (14);
Water level (15) from (14).

(15) The treated water outlet pipe (
The water is drained from 16 (16).

Cleaning of the contact filter media uses high-pressure water, which can be sprayed along the inside of the treatment tank (1) using several cleaning spray nozzles (17 (1)
7) generate a jet stream and stir water stream (18), (18
), the filter media is stirred and moved, and the water flow and the filter media rub against each other to wash them.

The peeled sludge is deposited in the sludge settling section (1) at the funnel-shaped lower part of the treatment tank (1).
9 (19), sludge extraction valve (2D), (20
).

The cleaning injection nozzle t17) may be an inexpensive one with a flattened discharge end or a resin pipe with a narrowed discharge opening, and high-pressure water can be supplied using a water supply pump by switching a valve. The cleaning water (22) and (22)i are discharged by switching the three-way cocks (21) and (21).

The number (23) is the treated water, and the number (24) is a footrest to improve the stability of the installation of this device.

The larger the porosity of the filter medium (11) and the larger the contact area, the more water to be treated needs to be supplied.
The larger the contact area, the shorter the treatment residence time can be.

This device receives a supply of air at the same time as the water to be treated under pressure, and has a large capacity to repeatedly supply a large amount of food and oxygen to the microorganisms, and has a large processing capacity.

[Brief explanation of drawings]

Claims (1)

[Claims] A cylindrical partition plate (4) having a perforated portion (3) at the top is provided in the center of a treatment tank (1) having a funnel-shaped bottom and a perforated plate (2) above the funnel. , the partition plate (4) is provided with a discharge port (10) of a gas-liquid mixed treated water injection nozzle (6) for supplying pressure-fed treated water (8) and air (7) from an air suction pipe (5); In the treatment tank (1), there is a contact filter medium (1
A contact oxidizing biological filtration device filled with an appropriate amount of 1), and characterized in that an injection nozzle (17) for cleaning the contact filter medium (11) is installed in the treatment tank (1).