TREATMENT PROCESS AND DEVICE FOR SUBMERGED LIFTING CIRCULATION TYPE BIO-MEMBRANE FILTER

Abstract

The present invention discloses a treatment process for a submerged lifting circulation type bio-membrane filter, wherein the treatment process comprises the following steps: two groups of symmetrically staggered filter curtains (2A and 2B) are adopted; the two groups of filter curtains (2A and 2B) are periodically lifted up and down in a reciprocating manner in a biofilter (1) under the action of a lifting mechanism (4), so that bio-membranes on the two groups of filter curtains (2A and 2B) are in contact with the atmosphere and sewage in turns, absorb organic matters in the sewage when lifting down for submerging, absorb oxygen when lifting up and exposing into to the atmosphere, and bring oxygen into the sewage and cause sewage turbulence in a water tank when lifting down for submerging again, so that the dissolved oxygen is uniformly distributed, thereby purifying the sewage.

Claims

1. A treatment process for a submerged lifting circulation type bio-membrane filter, comprising the following steps: two groups of symmetrically staggered filter curtains with equal weight are adopted; the two groups of filter curtains are periodically lifted up and down in a reciprocating manner in a biofilter under the action of a lifting mechanism, so that bio-membranes on the two groups of filter curtains are in contact with the atmosphere and sewage in turns, absorb organic matters in the sewage when lifting down for submerging, absorb oxygen when lifting up and exposing into the atmosphere, and bring oxygen into the sewage and cause sewage turbulence in a water tank when lifting down for submerging again, so that the dissolved oxygen is uniformly distributed, thereby purifying the sewage.

2. A device for the submerged lifting circulation bio-membrane filter, comprising a biofilter, a bearing frame, two groups of filter curtains with equal weight, a lifting mechanism, a pulley block and two groups of anti-swing guide rails, wherein the lifting mechanism is mounted at a middle position above a crossbeam of the bearing frame; the bearing frame crosses over the biofilter and is fixed on the ground or a biofilter body; the pulley block is suspended on the crossbeam of the bearing frame; the lifting mechanism is connected with the two groups of filter curtains and drives the two groups of filter curtains by the driving mechanism in such a manner that a pull rope assembly passes through the pulley block; and the two groups of anti-swing guide rails are respectively arranged at positions corresponding to the two ends of hanging beams of the two groups of filter curtains.

3. The device for the submerged lifting circulation bio-membrane filter according to claim 2, wherein the biofilter is of a rectangular structure and is located on or below the ground; the filter is divided into a plurality of contact reaction tanks by a plurality of partition plates parallel to the bearing frame; the liquid levels of the contact reaction tanks are lowered gradually; a water inlet tank and a water outlet tank of each contact reaction tank are respectively arranged on both sides of the biofilter and are perpendicular to the bearing frame; and the water outlet tank of the previous contact reaction tank is located on the same side as the water inlet tank of the next contact reaction tank and is communicated with each other, and so on; the partition plate between each contact reaction tank and each of the water inlet tank and the water outlet tank is serrated; and a sludge discharge pipe is arranged at the lowest position at the bottom of each of the water inlet tank and the water outlet tank.

4. The device for the submerged lifting circulation bio-membrane filter according to claim 2, wherein the bearing frame is used for mounting the lifting mechanism and the pulley block, crosses over the biofilter, coincides with a center-of-gravity plane of the filter curtain groups, and is fixedly connected to the ground or the filter body; the lifting mechanism is a power device for lifting and reciprocating the filter curtain groups, is composed of two parts: the driving mechanism and the pull rope assembly, and is mounted at the middle position above the crossbeam of the bearing frame; the two ends of the pull rope assembly respectively pass through two pulleys on the bearing frame and then are respectively connected with lifting lugs at center-of-gravity positions of the hanging beams of the two groups of filter curtains; and the driving mechanism drives the pull rope assembly to reciprocate, so that the pull rope pulls the two groups of filter curtains to reciprocate up and down, thereby driving the two groups of filter curtains to reciprocate up and down synchronously in opposite directions at the same speed.

5. The device for the submerged lifting circulation bio-membrane filter according to claim 2, wherein each filter curtain comprises a hanging beam, a plurality of connecting blocks and a plurality of filter plates; the hanging beam is a bearing structure of the whole filter curtain; the lifting lug is arranged at the center-of-gravity position of each filter curtain on the hanging beam for connecting with the pull rope of the lifting mechanism; the upper end and the lower end of each connecting block are fixedly connected with the hanging beam and one filter plate respectively, so that the filter plates are suspended on the hanging beam one by one; the lengths of the connecting blocks of different contact reaction tanks are also different; a length difference between adjacent specifications is the liquid level difference between two adjacent contact reaction tanks; the filter plates are located at the bottom; all the filter plates are perpendicular to the hanging beam; the center line of each filter plate coincides with the height center line of each connecting block; the two groups of filter curtains have the same structure and weight; the hanging beams on the two groups of filter curtains are respectively connected and fixed with the two ends of the pull ropes of the lifting mechanism and pulley block, and are pulled up by the pull ropes to be horizontally suspended above the two sides inside the biofilter; and the two groups of filter curtains are symmetrically and uniformly distributed in a staggered manner.

6. The device for the submerged lifting circulation bio-membrane filter according to claim 5, wherein each filter plate comprises two membranes and a frame; the membrane is a carrier for microbial growth; the two membranes are tightly attached to both sides of the frame respectively and kept at tension; the frame has a C-shaped structure; a slope is respectively arranged at an upper inner side and a lower inner side of the C shape; the membranes and the frame form a C-shaped rectangular structure with one side open; the thickness of the frame determines the distance between the two membranes; the frame in the contact reaction tank near a sewage inlet is relatively thick so that the distance between the membranes is relatively large; and the frame in the contact reaction tank near a sewage outlet is relatively thin so that the distance between the membranes is relatively small.

7. The device for the submerged lifting circulation bio-membrane filter according to claim 2, wherein two groups of anti-swing guide rails respectively correspond to two groups of filter curtains; each group of anti-swing guide rails is composed of two guide rails, which are respectively arranged at both ends of the biofilter and are parallel to each other; a connecting line of the two guide rails is located on the same plane with the up-and-down motion track of the hanging beam of each filter curtain; and guide rollers are mounted at both ends of the hanging beam and are respectively matched with the guide rails to guide and limit the filter curtain groups.

8. The device for the submerged lifting circulation bio-membrane filter according to claim 4, wherein the driving mechanism comprises a motor reducer, an output shaft of the driving mechanism, a driving gear, a driven gear, a driving sprocket, a forward rotating electromagnetic clutch and a backward rotating electromagnetic clutch; the output shaft of the motor reducer is fixedly connected with the driving gear and the driving sprocket; the driving gear is meshed with the driven gear; and the driving sprocket is connected with and drives the driven sprocket by a chain; the driven gear is fixedly connected with one end of the backward rotating electromagnetic clutch; and the other end of the backward rotating electromagnetic clutch is fixedly connected with the output shaft of the driving mechanism; the driven sprocket is fixedly connected with one end of the forward rotating electromagnetic clutch; the other end of the forward rotating electromagnetic clutch is also fixedly connected with the output shaft of the driving mechanism; and the output shaft of the driving mechanism pulls the two groups of filter curtains to reciprocate up and down through the pull rope assembly.

9. The device for the submerged lifting circulation bio-membrane filter according to claim 4, wherein the driving mechanism comprises a motor and a speed reducer; the forward rotation, stop, backward rotation, stop, and the like of the motor and the speed reducer are performed in cycles, and is connected with the pull rope assembly and drive the pull rope assembly to reciprocate; and the pull rope assembly reciprocates to be connected with the two groups of filter curtains and to drive the two groups of filter curtains to reciprocate up and down.

10. The device for the submerged lifting circulation bio-membrane filter according to claim 2, wherein a plurality of bearing frames and pulley blocks are added; the plurality of added bearing frames and pulley blocks lift the filter curtain groups through the pull ropes; the driving mechanism in the lifting mechanism is still mounted on the middle bearing frame; the plurality of added bearing frames and pulley blocks cross over two sides of the bio-membrane filter in rank, and are fixed on the ground or a bio-membrane filter body; the added pulley blocks are suspended on the added bearing frame, and are connected with the two groups of filter curtains and lift the two groups of filter curtains by the pull rope assembly, so that the two groups of filter curtains are lifted up by the pull rope and suspended above the two sides in the biofilter; and the driving mechanism drives the two groups of filter curtains to synchronously reciprocate up and down in opposite directions at the same speed.

11. The device for the submerged lifting circulation bio-membrane filter according to claim 2, wherein in the lifting process of the filter curtains, an upper end face of a lower part of a frame of one filter curtain should be lower than the liquid level in the contact reaction tank of the biofilter when the filter curtain is lifted up to the highest position; and a lower end face of an upper part of the frame of one filter curtain should be higher than the liquid level in the contact reaction tank of the biofilter when the filter curtain is lifted down to the lowest position, so as to avoid excessive impact and disturbance caused by a liquid surface on each filter curtain.

12. The device for the submerged lifting circulation bio-membrane filter according to claim 2, wherein a thermal insulation shed is arranged outside the bio-membrane filter; a closed space is formed in the thermal insulation shed to separate the whole bio-membrane filter from the outside; an induced draft fan is arranged outside the thermal insulation shed; a blast pipeline of the induced draft fan is communicated with the interior of the thermal insulation shed; an exhaust pipeline of the induced draft fan is connected with deodorization equipment; and the thermal insulation shed isolates odor pollution while realizing thermal insulation, and controls the oxygen supply by controlling the air volume of the induced draft fan.

Description

DESCRIPTION OF THE DRAWINGS

[0039] FIG. 1 is a stereogram of the structure of a submerged lifting circulation type bio-membrane filter;

[0040] FIG. 2 is a top view of the structure of the submerged lifting circulation type bio-membrane filter;

[0041] FIG. 3 is an A-A view of FIG. 2;

[0042] FIG. 4 is a B-B view of FIG. 2;

[0043] FIG. 5 is a top view of the structure of a bio-membrane filter;

[0044] FIG. 6 is a C-C view of FIG. 5;

[0045] FIG. 7 is a D-D view of FIG. 5;

[0046] FIG. 8 is a schematic diagram of the structure of a filter curtain;

[0047] FIG. 9 is a side view of FIG. 8;

[0048] FIG. 10 is a schematic diagram of the structure of a filter plate;

[0049] FIG. 11 is a G-G view of FIG. 10;

[0050] FIG. 12 is an enlarged view of a part I of FIG. 10;

[0051] FIG. 13 is a schematic diagram of a relative position of the filter plate and the liquid level when the filter curtain is in an extreme position;

[0052] FIG. 14 is a schematic diagram of the structures of a bearing frame and a lifting mechanism;

[0053] FIG. 15 is an E-E view of FIG. 15;

[0054] FIG. 16 is a schematic diagram of the structure of a driving assembly; and

[0055] FIG. 17 is a stereogram of the structure of a bio-membrane filter with multiple bearing frames.

[0056] In the figures:

[0057] 1bio-membrane filter, 2Afilter curtain A, 2Bfilter curtain B, 3bearing frame, 4lifting mechanism, 5anti-swing guide rail, 6thermal insulation shed, 7induced draft fan, 8liquid level line and 9pulley block; 101contact reaction tank; 101acontact reaction tank a, 101bcontact reaction tank b, 101ccontact reaction tank c, 101scontact reaction tank s, 102water inlet tank, 103water outlet tank, 104sludge discharge pipe and 105partition plate;

[0058] 202connecting block, 203filter plate; 201hanging beam, 202aconnecting block a, 202bconnecting block b, 202cconnecting block c, 202mconnecting block in, 203afilter plate a, 203bfilter plate b, 203cfilter plate c, 203nfilter plate n and 204guide roller; 2031membrane and 2032frame; 2031aleft membrane and 2031bright membrane; 301gantry, 9apulley a and 9bpulley b; 401driving mechanism; 402pull rope assembly; 401amotor reducer, 401boutput shaft of motor reducer, 401c1driving gear, 401c2driven gear, 401d1driving sprocket, 401d2driven sprocket, 401echain, 401f1forward rotating electromagnetic clutch, 401f2backward rotating electromagnetic clutch and 401goutput shaft of driving mechanism; and 3Abearing frame A, 3Bbearing frame B and 3Xbearing frame X.

DETAILED DESCRIPTION OF PREFERRED EMBODIMENTS

Embodiment 1 (in Case of Single Bearing Frame)

[0059] A submerged lifting circulation type bio-membrane filter according to the present invention, having a structure as shown in FIGS. 1-4, is mainly composed of a biofilter 1, two groups of filter curtains 2A and 2B with equal weight, a bearing frame 3, a lifting mechanism 4, an anti-swing guide rail group 5, pulley blocks 9, etc. The biofilter 1 refers to multiple groups of rectangular containers located on or below the ground. The bearing frame 3 crosses over the biofilter 1 and coincides with the center-of-gravity planes of the filter curtains 2A and 2B, and is fixedly connected to the ground or a filter body of the biofilter 1. The pulley blocks 9 are suspended below a crossbeam of the bearing frame, and are respectively located at two sides. The lifting mechanism 4 is mounted at a middle position above the crossbeam of the bearing frame; and two ends of a pull rope of the lifting mechanism 4 respectively pass through the pulley blocks on both sides and are connected with the two groups of filter curtains 2A and 2B. The two groups of filter curtains 2A and 2B have the same structure and the same weight; hanging beams of the two groups of filter curtains 2A and 2B are respectively connected and fixed with the two ends of the pull rope of the lifting mechanism 4, and are pulled up and horizontally suspended above the two sides inside the biofilter; and the two groups of filter curtains 2A and 2B are symmetrically and uniformly distributed in a staggered manner. The two groups of filter curtains 2A and 2B are driven by the pull rope of the lifting mechanism 4 to lift up and down periodically, so that bio-membranes on the two groups of filter curtains 2A and 2B are in contact with the atmosphere and the sewage in turns, absorb organic matters in the sewage when lifting down for submerging, absorb oxygen when lifting up and exposing into the atmosphere, and bring oxygen into the sewage and cause sewage turbulence in a water tank when lifting down for submerging again, thereby uniformly distributing the dissolved oxygen. The anti-swing guide rails 5 are vertically mounted at both ends of the biofilter, and are respectively matched with the guide rollers at both ends of the hanging beams of the filter curtains 2A and 2B to play a role of guiding and limiting the filter curtain groups, thereby ensuring that the filter curtains always keep moving vertically up and down in the whole motion process.

[0060] A thermal insulation shed 6 can be arranged outside the bio-membrane filter according to actual needs, wherein a closed space is formed in the thermal insulation shed 6 to separate whole bio-membrane filter from the outside; an induced draft fan 7 is arranged outside the thermal insulation shed 6; a blast pipeline of the induced draft fan 7 is communicated with the interior of the thermal insulation shed 6; and an exhaust pipeline of the induced draft fan 7 is connected with deodorization equipment. The thermal insulation shed can insulate odor pollution while realizing thermal insulation, and can also control the oxygen supply by controlling the air volume of the induced draft fan.

[0061] The bio-membrane filter 1 according to the present invention, having a structure as shown in FIGS. 5-7, is of a rectangular structure, and is generally prepared from materials including but not limited to concrete, steel, hard plastics, etc. A plurality of partition plates 105 are arranged in the bio-membrane filter, to divide the whole biofilter into a plurality of contact reaction tanks 101a, 101b, 101c, . . . and 101s along a length direction. The liquid level heights in the contact reaction tanks 101a, 101b, 101c, . . . and 101s lower in sequence; water inlet tanks 102 and water inlet tanks 103 of the contact reaction tanks 101a, 101b, . . . 101s are respectively arranged on both sides of the biofilter 1; the water outlet tank of the previous contact reaction tank 101a is located on the same side as the water inlet tank of the next contact reaction tank 101b and is communicated with each other; water enters from the water inlet tank of the first contact reaction tank 101a; supernatant of the water inlet tank 102 enters the contact reaction tanks 101a, 101b, 101c, . . . and 101s through overflow; and the supernatant of the contact reaction tanks 101a, 101b, 101c, . . . and 101s enters the water outlet tank through overflow, and finally is discharged from the water outlet tank of the last contact reaction tank 101s. The partition plate between each of the contact reaction tanks 101a, 101b, 101c, . . . and 101s and each of the water inlet tank 102 and the water outlet tank 103 are serrated, thereby better ensuring the smooth water flow and avoiding impact. A sludge discharge pipe 104 is arranged at the lowest position at the bottom of each of the water inlet tank 102 and the water outlet tank 103 for discharging the deposited sludge.

[0062] The filter curtains 2A and 2B according to the present invention, having a structure as shown in FIGS. 8 and 9, each is mainly composed of a hanging beam 201, a plurality of connecting blocks 202a, 202b, 202c, . . . and 202m, a plurality of filter plates 203a, 203b, 203c, . . . and 203n and guide rollers 204, wherein the number of the connecting blocks is the same as that of the filter plates. The hanging beam 201 is a bearing structure of the whole filter curtain, and is usually made of section bars; and lifting lugs are arranged on the hanging beams 201 for connecting with the pull rope of the lifting mechanism 4. An upper end and a lower end of each connecting block 202a, 202b, 202c, . . . or 202m are fixedly connected with the hanging beam 201 and one filter plate 203a, 203b, 203c, . . . or 203n respectively, so that the filter plates 203a, 203b, 203c, . . . and 203n are suspended on the hanging beam 201 one by one. The connecting blocks 203a, 203b, 203c, . . . and 203n also have a plurality of specifications in length according to different liquid level heights of different contact reaction tanks 101a, 101b, 101c, . . . and 101s; and the length difference between adjacent specifications is equal to the liquid level difference between two adjacent contact reaction tanks 101a, 101b, 101c, . . . and 101s. The filter plates 203a, 203b, 203c, . . . and 203n are located at the bottom of the filter curtains 2A and 2B. All the filter plates 203a, 203b, 203c, . . . and 203n are perpendicular to the hanging beam 201. A center-of-gravity line of each filter plate 203a, 203b, 203c, . . . or 203n coincides with a height center line of the connecting block 202a, 202b, 202c, . . . or 202m connected with each filter plate. Guide rollers are mounted and fixed at both ends of the hanging beam, and are respectively matched with the anti-swing guide rails 5 to play the roles of guiding and limiting the filter curtains 2A and 2B.

[0063] The filter plates 203a, 203b, 203c, . . . and 203n according to the present invention, having a structure as shown in FIGS. 10-13, each is composed of two membranes 2031a and 2031b and a frame 2032. The membranes 2031a and 2031b are working parts of the whole biofilter, are carriers for microbial growth, and are made of materials including but not limited to plastics, films, geotextiles, etc. The two membranes 2031a and 2031b are tightly attached to both sides of the frame 2032 respectively and kept at tension. The frame 2032 is has a C-shaped structure, and is prepared from materials including but not limited to the section bars and hard materials; a slope is respectively arranged at an upper inner side and a lower inner side of the C shape, which can not only effectively ensure the stability and strength of the structure, but also facilitate the discharge of sludge, thereby avoiding the deposition of the sludge inside the filter plates 203a, 203b, 203c, . . . and 203n. The two membranes 2031a and 2031b and the frame 2032 form a C-shaped rectangular structure with one side open. The thickness of the frame 2032 determines the distance between the two membranes 2031a and 2031b. To avoid blockage, the frame in the biofilter near a sewage inlet is relatively thick so that the distance between the membranes is relatively large (greater than or equal to 3 cm); and the frame in the biofilter near a sewage outlet is relatively thin so that the distance between the membranes is relatively small (less than or equal to 2 cm).

[0064] As shown in FIG. 14, in the lifting process of the filter curtains 2A and 2B, an upper end face of a lower part of the frame 2032 should be lower than the liquid level in the contact reaction tank when the filter curtain 2A is lifted up to the highest position; and a lower end face of an upper part of the frame 2032 should be lower than the liquid level in the contact reaction tank when the filter curtain 2B is lifted down to the lowest position, so as to avoid excessive impact and disturbance of the liquid surface on the filter curtains. On the contrary, the lower end face of the upper part of the frame 2032 should be higher than the liquid level in the contact reaction tank when the curtain 2A is lifted down to the lowest position; and the upper end face of the lower part of the frame 2032 should be lower than the liquid level in the contact reaction tank when the filter curtain 2B is lifted up to the highest position.

[0065] The bearing frame 3, the lifting mechanism 4 and the pulley block 9 according to the present invention have structures as shown in FIGS. 15 and 16. Two pulleys 9a and 9b of the pulley block 9 are respectively mounted on two sides below the crossbeam of a gantry 301. The lifting mechanism 4 is a power device for lifting and reciprocating the filter curtains 2A and 2B, and comprises two parts: a driving assembly 401 and a pull rope assembly 402. The driving assembly 401 and the pull rope assembly 402 are connected together and fixed in the middle of the crossbeam of the bearing frame 3. The two ends of the pull rope assembly 402 respectively pass through two pulleys 9a and 9b and are respectively connected with the lifting lugs at the center-of-gravity positions of the hanging beams 201 of the two groups of filter curtains 2A and 2B. The driving assembly 401 comprises two parts: a driving motor and a speed reducer; the cycles of forward rotation, stop, backward rotation, stop, etc. of the motor are controlled to drive the pull rope assembly to reciprocate; and the driving assembly 401 drives the two groups of filter curtains 2A and 2B to synchronously reciprocate up and down in opposite directions at the same speed.

[0066] The driving assembly 401, having a structure as shown in FIG. 17, is composed of a motor reducer 401a, an output shaft 401b, a driving gear 401c1, a driven gear 401c2, a driving sprocket 401d1, a driven sprocket 401d2, a chain 401e, a forward rotating electromagnetic clutch 401f1, a backward rotating electromagnetic clutch 401f2 and an output shaft 401g. The motor reducer 401a is a power source, which drives the driving gear 401c1 and the driving sprocket 401d1 to rotate through the output shaft; and the driving gear 401c1 and the driving sprocket 401d1 rotate to respectively drive the driven gear 401c2 and the driven sprocket 401d2 to rotate. The forward rotating electromagnetic clutch 401f1 and the backward rotating electromagnetic clutch 401f2 are fixedly connected to the output shaft 401g respectively. When the forward rotating electromagnetic clutch 401fl is engaged with the driven sprocket 401d2 toward the right, the driven sprocket 401d2 drives the output shaft 401g to rotate together, thereby realizing the forward rotation output of the output shaft 401g. When the forward rotating electromagnetic clutch 401f1 is disengaged from the driven sprocket 401d2 to the left and returns to the neutral position, the power input is stopped and the output shaft 401g will also stop rotating. When the backward rotating electromagnetic clutch 401f2 is engaged with the driven gear 401c2 toward the left, the driven gear 401c2 drives the output shaft 401g to rotate together, thereby realizing the backward rotation output of the output shaft 401g. When the backward rotating electromagnetic clutch 40112 is disengaged from the driven gear 401c2 to the right and returns to the neutral position, the power input is stopped and the output shaft 401g will also stop rotating. In this way, the driving assembly can realize free switching of the output of forward rotation, stop, backward rotation, stop, etc. in cycles without changing the operation of the motor reducer by periodically controlling the switching of the forward rotating electromagnetic clutch 401f1 and the backward rotating electromagnetic clutch 401f2.

Embodiment 2 (in Case of Multiple Bearing Frames)

[0067] A large biofilter, which needs to adopt multiple bearing frames, according to the present invention has a structure as shown in FIG. 18, wherein a main structure of the large biofilter is the same as that of the biofilter with single bearing frame, except that a plurality of bearing frames 3D, . . . and 3x are added in the length direction of the biofilter 1, and the added bearing frames 3B, . . . and 3X are symmetrically distributed around the center of the middle bearing frame 3A. Each bearing frame 3A, 3B, . . . or 3X has the pull rope, which is connected with the lifting lugs on the hanging beam 201 of the filter curtains 2A and 2B to share the weight of the filter curtains 2A and 2B, so that the two groups of filter curtains are pulled up by the pull ropes and horizontally suspended above the two sides in the biofilter; and the driving mechanism drives the two groups of filter curtains to synchronously reciprocate up and down in opposite directions at the same speed.