CN2438709Y

CN2438709Y - Upward flow aeration biological filtering tank

Info

Publication number: CN2438709Y
Application number: CN00221332U
Authority: CN
Inventors: 郑俊
Original assignee: MAANSHAN IRON AND STEEL DESIGN
Current assignee: MAANSHAN IRON AND STEEL DESIGN
Priority date: 2000-08-04
Filing date: 2000-08-04
Publication date: 2001-07-11
Anticipated expiration: 2010-08-04

Abstract

The utility model discloses an upward flow aeration biological filtering tank. Under the condition of aeration at the bottom of the tank for oxygen supply, sewage and air flow through the biological filtering tank in the same direction from bottom to top to purify the sewage. The utility model has the essential structure that a buffering water distributing chamber 1 is positioned on the lower part of a tank body, and a water outlet area 4 is positioned on the upper part of the tank body; a sewage inlet tube 13, a back flushing air tube 11, and a back flushing water pipe 12 are arranged on the middle lower part of the buffering water distributing chamber 1; a water and air distributing device is arranged on a filtering material bearing plate 14 of the buffering water distributing chamber 1; a normal aeration tube 10 is arranged on the middle part of a pebble bed 2; a sloping plate settling device 8 and a flow stabilizing plate 9 are arranged between the upper part of the water outlet area 4 and a water outlet trough 5. The filtering tank not only has the advantages that the water distribution and the air distribution are uniform, and blockage is not easy to occur, but also can prevent filtering material from running off, and the effect of sewage treatment is obvious.

Description

Up-flow Biological Aerated Filter

The utility model relates to a kind of biological filter that is used for sewage disposal.

In the prior biological filter tank, general sewage water inlet pipe is located at top, filter tank, adopts under the sewage to flowing through the filter tank, is provided with ventilation hole in the bottom, filter tank and relies on the natural ventilation oxygen supply, and air water is reverse and go.Its water distribution system adopts " rich " font structure that has main and perforation arm.There are many defectives in this filter tank in actual motion:

1, owing to adopt the natural ventilation oxygen supply, easily causes air feed barometric distribution inequality on the whole filter tank height that is in operation, form channel or short stream easily, in filtrate, form bubble simultaneously easily, cause local gas to block up phenomenon.And the quality of natural ventilation oxygen supply situation is limited by poor, filter tank height, filtrate porosity and the wind-force of temperature and temperature in the pond, can not provide stable, ventilation uniformly to the filter tank;

2, owing to adopt under the sewage to flowing through filter tank and natural ventilation oxygen supply, air water is reverse flow, and air stops current to bring the solid matter in the sewage into the filter bed depths to a certain extent, thereby makes solid matter accumulate in the top layer in filter tank, and the filter tank is stopped up easily.The filter tank is stopped up can influence natural ventilation, makes filter tank oxygen supply deficiency cause the anoxic microbial phenomenon, has a strong impact on treatment effect;

3, because water distribution system adopts " rich " font structure, water distribution is difficult for evenly, and head loss is bigger.

4, this filter tank is not provided with any device at exhalant region, and filtrate tends to flow out along with current, makes microorganism concn reduction in the filter tank.

The purpose of this utility model provides and a kind ofly can provide stable oxygen source to the filter tank, and the aqueous vapor uniform distribution prevents that the filter tank from stopping up and filtrate runs off and the significant biological filter of wastewater treatment efficiency.

For achieving the above object, biological filter of the present utility model is a cylinder, forms by cushioning distributing water room, pebble bed, filter material layer, exhalant region and being positioned at the external effluent trough above exhalant region in pond.Wherein cushion distributing water room and be positioned at body bottom, pond, exhalant region is positioned at body top, pond; Be provided with sewage water inlet pipe, back flushing blast main and back flushing water pipe in buffering distributing water room middle and lower part; On the filtrate supporting plate of buffering distributing water room, establish strainer head water distribution, air distributing device; Be provided with normal aeration tube at the pebble bed middle part; Be provided with tilted plate separator and stabilier above the exhalant region and between the effluent trough; Sewage enters buffering distributing water room by sewage water inlet pipe and upwards flows through pebble bed and filter material layer through water distribution, air distributing device, from the tilted plate separator and the outflow of the water outlet between the stabilier of exhalant region.

After adopting such structure, owing to be provided with normal aeration tube forced-air blast aeration at pebble bed middle part, air feed stable gas pressure on the height of filter tank like this, water-gas distribution is even, prevents bubble condensing in filtrate; Simultaneously, because buffering distributing water room is positioned at body bottom, pond, sewage and the air long filter material layer that microbial film is arranged of concurrent from bottom to top like this, avoid forming channel or short stream, air can be brought the solid matter in the sewage into the filter bed depths, prevents the filter tank obstruction, and wastewater purifying efficiency is remarkable; Adopt strainer head water distribution, air distributing device, not only water distribution is even, and uniform water distribution and distribution simultaneously when filter back washing; This external exhalant region is provided with tilted plate separator and stabilier, and filtrate is settled down, and gets back in the filter tank to keep in the filter tank higher microorganism concn being arranged.

Below in conjunction with the drawings and specific embodiments the utility model is described in further detail.

Fig. 1 is the structural representation of the utility model BAF;

Fig. 2 is a strainer head structural representation in the biological filter shown in Figure 1.

BAF shown in Figure 1 comprises buffering distributing water room 1, pebble bed 2, filter material layer 3, exhalant region 4 and is positioned at the parts such as effluent trough 5 of exhalant region 4 tops that the pond body is a round shape.Effluent trough 5 is and the body concentric right cylinder in pond that its bottom is provided with back flushing water shoot 6 and rising pipe 7.Between exhalant region 4 and effluent trough 5, be provided with tilted plate separator 8 and stabilier 9, tilted plate separator 8 outer walls are and the body concentric right cylinder in pond, inwall is a cone table, 5 ones are connected at the bottom of its bottom effluent trough, inwall lower port internal diameter is identical with pond body diameter, and be fixed in Chi Tishang, the inwall of outer wall and effluent trough 5 keeps at a certain distance away.Stabilier 9 is the cylinder identical with the filter tank diameter, and its top is connected mutually with effluent trough 5 inner top surfaces, and the bottom of bottom and tilted plate separator 8 is had certain distance in vain, and this space is the water outlet of tilted plate separator 8.Be provided with normal aeration tube 10 at pebble bed 2 middle parts, the forced-air blast aeration is supplied with the stable oxygen source in filter tank.Buffering distributing water room 1 is positioned at body bottom, pond, be provided with back flushing blast main 11, back flushing water pipe 12 and sewage water inlet pipe 13 in buffering distributing water room 1 middle and lower part, water outlet when wherein connection rising pipe 7 in back flushing water pipe 12 upper ends normally moves to utilize the filter tank, distributing water room 1 is cushioned with sewage water inlet pipe 13 accesses in parallel in back flushing water pipe 12 lower ends.Be provided with water distribution, distribution device on the filtrate supporting plate 14 of buffering distributing water room 1, water distribution, air distributing device are made up of the strainer head 15 that is distributed on the supporting plate 14.

Strainer head 15 shown in Figure 2 is made up of water filtering cap 16 and long handle 17, and water filtering cap 16 is a hemispherical shell, evenly has many grooves 18 above; Long handle 17 is the plastics or the nylon tube of hollow, and its top and middle and lower part have a plurality of apertures or slit 19.Water filtering cap 16 is connected with rib collar with 17 of long handles, and water filtering cap 16 is installed in supporting plate 14 tops, and long handle 17 passes supporting plate 14 to buffering distributing water room 1.During normal the operation, pending water enters water filtering cap 16 by the lower port of long handle 17 and the aperture or the slit 19 of top and middle and lower part, and by bar groove 18 smooth outflow on the water filtering cap 16, plays the purpose of uniform distribution water; When back flushing, buffering distributing water room 1 enters backwashing water and back flushing pressurized air simultaneously, back flushing pressurized air forms air cushion layer at the water surface and 14 of the supporting plates of buffering distributing water room 1, make air enter water filtering cap 16 by the aperture on long handle 17 tops, simultaneously because the effect of air pressure makes backwashing water enter long handle 17 and the water filtering cap 16 that arrives by the lower end of long handle 17, water, gas are flowed out by water filtering cap 16 simultaneously enter filter material layer, play the purpose of water distribution uniformity, gas distribution.

Like this, when moving in the biological filter, treatment sewage flows into buffering distributing water room 1 by sewage water inlet pipe 13, evenly upwards flow out through water distribution, distribution device, meanwhile normal aeration tube 10 is carried the required air (oxygen source) of microbial film metabolism in the pond, air water uniform distribution in the pond, and concurrent outgrowth from bottom to top has the filter material layer of microbial film, microbial film is drawn from sewage under oxygen supply condition deliquescently has pollutent as nutrition source, and sewage is purified.Brought to filtrate sedimentation in tilted plate separator 8 at water outlet place in operation or during back flushing by current, and be back in the filter tank, to guarantee the microorganism concn in the filter tank.The effect of stabilier 9 is to make the current that enter tilted plate separator 8 more stable, and the current fluctuation is little, so that best settling condition to be provided.The angle of inclination of tilted plate separator 8 is designed to 68 ° according to practical operating experiences, can be taken out of outside the pond with current when operation or the back flushing with the microbial film that guarantees to come off, and filtrate then can not taken out of outside the pond.Purifying waste water after the processing flowed out to effluent trough 5 and discharged by rising pipe 7 by tilted plate separator 8.When running to a certain degree, owing to thicken coming off of microbial film on the filtrate, can have the microbial film that part comes off in the water outlet, make the effluent quality variation, at this moment must close the water inlet pipe valve, start backwash pump, open the backwashing water tube valve, open back flushing blast main 12 simultaneously, under gas, water act on simultaneously, filter material layer is carried out back flushing.

Example: at diameter is ∮ 4500mm, highly be in the circular Up-flow Biological Aerated Filter of 6300mm, be filled with highly to the circular ceramic grain filter of 3600mm and highly be the pebble bed of 400mm, pebble bed bottom distance at the bottom of the pond is 900mm, from being 1400mm, the tilted plate separator inclination angle is 68 ° far from the pond apex distance at the filtrate top.Work as BOD ₅Volumetric loading is 6.41kg/m ³D, aeration gas-water ratio are 4: 1 o'clock, and this equipment can be with 1200m ³The BOD of/d sanitary sewage ₅Reduce to 25mg/l from 365mg/l.When back flushing waterpower load is 15m ³/ m ²H, when the back flushing air velocity is 50～55m/h, the experience 10min can filter back washing is clean, backwashing period is 2.5 days.

Claims

1, a kind of Up-flow Biological Aerated Filter, by buffering distributing water room (1), pebble bed (2), filter material layer (3), exhalant region (4) and be positioned at that the pond is external to be formed at exhalant region (4) top effluent trough (5), the pond body is a cylinder, it is characterized in that: described buffering distributing water room (1) is positioned at body bottom, pond, and exhalant region (4) is positioned at body top, pond; Be provided with sewage water inlet pipe (13), back flushing blast main (11) and back flushing water pipe (12) in buffering distributing water room (1) middle and lower part; On the filtrate supporting plate (14) of buffering distributing water room (1), establish water distribution, air distributing device; Be provided with normal aeration tube (10) at pebble bed (2) middle part; Between exhalant region (4) top and effluent trough (5), be provided with tilted plate separator (8) and stabilier (9); Sewage enters buffering distributing water room (1) by sewage water inlet pipe (13) and upwards flows through pebble bed (2) and filter material layer (3) through water distribution, air distributing device, from the tilted plate separator (8) and the outflow of the water outlet between the stabilier (9) of exhalant region (2).

2, biological filter according to claim 1, it is characterized in that: described tilted plate separator (8) outer wall is and the body concentric right cylinder in pond, inwall is a cone table, its bottom is connected with (5) portion at the bottom of the effluent trough, inwall lower port internal diameter is identical with pond body diameter, and be fixed in Chi Tishang, the inwall of tilted plate separator (8) outer wall and effluent trough (5) keeps at a certain distance away.

3, biological filter according to claim 1, it is characterized in that: described stabilier (9) is the cylinder identical with the filter tank diameter, its top is connected mutually with effluent trough (5) inner top surface, the bottom is had certain distance in vain with the bottom of tilted plate separator (8), and this space is the water outlet of tilted plate separator (8).

4, biological filter according to claim 1, it is characterized in that: described water distribution, air distributing device are made up of the strainer head (15) that is distributed on the supporting plate (14), described strainer head (15) is made up of water filtering cap (16) and long handle (17), water filtering cap (16) is a hemispherical shell, evenly has many grooves (18) above; Long handle (17) is the plastics or the nylon tube of hollow, its top and middle and lower part have a plurality of apertures or slit (19), be connected with rib collar between water filtering cap (16) and long handle (17), water filtering cap (16) is installed in supporting plate (14) top, and long handle (17) passes supporting plate (14) to cushioning distributing water room (1).

5, biological filter according to claim 1, it is characterized in that: the water outlet when described back flushing water pipe (12) upper end connection rising pipe (7) normally moves to utilize the filter tank, back flushing water pipe (12) lower end access buffering in parallel distributing water room (1) with sewage water inlet pipe (13).