CN219136575U - Sewage zero discharge system of water purification station - Google Patents

Abstract

The utility model belongs to the field of water purification treatment equipment, and particularly relates to a sewage zero-emission system of a water purification station, which comprises a raw water tank, a flocculation device, a fluidized bed sedimentation tank, a D-type filter tank, a water seal tank and a clean water tank which are sequentially connected through pipelines; the flocculation device is fixed on the outer side wall of the fluidized bed sedimentation tank, the flocculation device is communicated with the fluidized bed sedimentation tank through a pipeline, and sewage enters the fluidized bed sedimentation tank to realize separation of mud and water after the flocculation device performs flocculation treatment; the sediment outlet end of the fluidized bed sedimentation tank is also connected with a mud storage tank; the clean water outlet end of the fluidized bed sedimentation tank is connected with the water inlet of the D-shaped filter tank through a pipeline; the outlet end of the sludge storage tank is connected with the sludge dewatering device through a pipeline and a sludge pump, and is used for realizing zero discharge of sewage; the utility model only needs to purify raw water and dewater sludge by once water feeding, realizes zero discharge of sewage, saves water resources and obtains excellent water quality after raw water treatment.

Description

Sewage zero discharge system of water purification station

Technical Field

The utility model belongs to the field of water purification treatment equipment, and particularly relates to a sewage zero discharge system of a water purification station.

Background

In the prior art, raw water is purified only through advection sedimentation or inclined tube sedimentation and a V-shaped filter tank, sewage generated in the purification process is not treated, and sludge water generated in the purification process is directly discharged from municipal pipelines, so that certain pollution is caused to the environment; meanwhile, the ascending flow rate of the inclined tube/inclined plate sedimentation tank is 6-9m/h, and the filtering rate of the V-shaped filter tank is 6-8m/h; the backwash water consumption rate of the V-shaped filter tank is 1.5-2%, so that the daily sewage treatment efficiency of a single tank is low;

the utility model patent with publication number of CN103130375A discloses a sewage zero-discharge system for recycling waste plastics, which is formed by an in-plant water system and an out-plant sewage treatment system together, wherein reclaimed water after out-plant treatment and additional clean water are used as water sources of the in-plant water system, the water sources are added by a tertiary cleaning pool, then flow back into a secondary cleaning pool and a pre-cleaning pool in sequence, finally flow into a water storage adjusting pool through a water collecting pipeline, and enter the out-plant sewage treatment system, and a closed loop formed by the in-plant water system and the out-plant sewage treatment system is formed, so that the sewage zero-discharge system for recycling waste plastics is formed. The water consumption for cleaning is increased and the waste of water resources is caused by the segmented water processing technology in the traditional waste plastic cleaning technology;

aiming at the current situation, the development of a sewage zero-discharge system of a water purification station is urgently needed to overcome the defects in the current practical application.

Disclosure of Invention

The utility model aims to overcome the defects of the prior art and provides a sewage zero discharge system of a water purification station.

The utility model provides a sewage zero discharge system of a water purification station, which comprises a raw water tank, a flocculation device, a fluidized bed sedimentation tank, a D-type filter tank, a water seal tank and a clean water tank which are connected in sequence through pipelines;

the flocculation device is fixed on the outer side wall of the fluidized bed sedimentation tank, the flocculation device is communicated with the fluidized bed sedimentation tank through a pipeline, and sewage enters the fluidized bed sedimentation tank to realize separation of mud and water after the flocculation device performs flocculation treatment;

the sediment outlet end of the fluidized bed sedimentation tank is also connected with a mud storage tank; the clean water outlet end of the fluidized bed sedimentation tank is connected with the water inlet of the D-shaped filter tank through a pipeline; the backwashing air inlet pipe is connected with the backwashing air inlet end of the D-shaped filter tank, and the backwashing water outlet end of the D-shaped filter tank is communicated with the inlet end of the mud storage tank through a pipeline;

a backwashing air inlet pipe is arranged on the D-shaped filter tank, and a backwashing fan is arranged on the backwashing air inlet pipe; a clear water pipe is arranged between the D-shaped filter tank and the clear water tank, a clear water outlet end of the D-shaped filter tank is communicated with an inlet end of the clear water tank through the clear water pipe, a backwashing pipe is arranged on the clear water pipe, and a backwashing water pump is arranged on the backwashing pipe;

the outlet end of the sludge storage tank is provided with a sludge dewatering device, and the outlet end of the sludge storage tank is connected with the sludge dewatering device through a pipeline and is used for realizing zero discharge of sewage;

the outside of the clean water tank is provided with a water supply pipe, the outlet end of the clean water tank is communicated with an external water supply device through a pipeline, and a water supply pump is arranged on the water supply pipe; the outlet end of the water supply pump is also provided with a flushing device for supplementing water for the flocculation device and flushing the sludge dewatering machine;

a disinfection dosing device is arranged outside the clean water tank, and the inlet end of the clean water tank is also connected with the disinfection dosing device through a pipeline;

further, the sludge dewatering device comprises a sludge dewatering machine and a supernatant reflux pump; the outlet end of the sludge storage pool is respectively communicated with the inlet ends of the sludge dehydrator and the supernatant fluid reflux pump through a pipeline, the outlet end of the sludge dehydrator is connected with the conveying equipment and is used for outputting sludge to a designated place, and the outlet end of the supernatant fluid reflux pump is communicated with the inlet end of the raw water pool through a pipeline;

a sludge pump is arranged on a connecting pipeline of the sludge storage tank and the sludge dehydrator and is used for pumping the sludge in the sludge storage tank into the sludge dehydrator;

further, the flushing device comprises a flushing pipeline and a second flocculation dosing device, the sludge dewatering machine comprises a sewage part inlet end and a sludge part outlet end, the inlet end of the flushing pipeline is connected with the outlet end of the water supply pump, the outlet end of the flushing pipeline is respectively connected with the sewage part inlet end, the sludge part outlet end and the inlet end of the flocculation device, and the flushing pipeline is used for flushing the dosing device and the sludge dewatering machine, and the second flocculation dosing device is communicated between the outlet end of the flushing pipeline and the sewage part inlet end;

further, the flocculation device comprises a mixer, and a coagulation-assisting dosing device and a flocculation dosing device are arranged outside the mixer;

the fluidized bed sedimentation tank comprises a sedimentation tank body, wherein a water collecting tank, a mud-water separator, a reactor and a mud discharging layer are sequentially and fixedly connected between the inner side walls of the sedimentation tank body from top to bottom, and the mud discharging layer is positioned at the bottom of the fluidized bed sedimentation tank;

the side wall of the mud discharging layer is connected with a mud discharging pipe, the mud discharging layer is communicated with the mud storage tank through the mud discharging pipe, and a mud pump is arranged on the mud discharging pipe;

the coagulation-assisting chemical adding device and the flocculation chemical adding device are communicated with the water inlet of the mixer through pipelines, the water outlet of the mixer is communicated with the water inlet of the reactor through pipelines, the water outlet of the reactor is connected with the water inlet of the mud-water separator for realizing mud-water separation, and the water outlet of the mud-water separator is communicated with the water inlet of the water collecting tank through pipelines for storing purified water; the water outlet of the water collecting tank is communicated with the D-shaped filter tank through a pipeline;

further, set up and the connecting block between sedimentation tank body and the reactor, the connecting block is the cuboid connecting block, sedimentation tank body and reactor pass through connecting block fixed connection.

Further, the mud-water separator is a circular separator, a plurality of first holes are uniformly distributed on the circular separator, and the first holes are distributed in a honeycomb shape.

Further, the mixer includes: a reaction box and a plurality of bulges;

the bulges are fixedly connected with the two opposite side walls inside the reaction box, and the bulges are arranged in a staggered manner; the water outlet of the mixer is positioned at the bottom of the reaction box, and the water inlet of the mixer is close to the top of the reaction box.

Further, the D-type filter includes: the filter body and the secondary water and gas distribution device;

the filter tank comprises a filter tank body, wherein an anti-running device, a self-adaptive filter material layer, a pebble cushion layer and a primary water and gas distribution device are sequentially and fixedly arranged between the inner side walls of the filter tank body from top to bottom, and the primary water and gas distribution device is positioned at the bottom of the filter tank body;

a water inlet channel and a backwash drainage channel are fixedly arranged on the inner side wall of the filter body, the water inlet channel is positioned above the material leakage preventing device, the backwash drainage channel is positioned between the side wall of the filter body and the side wall of the material leakage preventing device, and a port of the drainage channel is higher than the upper surface of the material leakage preventing device; the water inlet channel and the backwash drainage channel are respectively positioned at two opposite sides of the filter body;

the water outlet of the water collecting tank is communicated with the water inlet channel;

the water outlet of the backwashing drainage is communicated with the mud storage pool through a pipeline;

a backwashing water inlet channel is arranged in the primary water and gas distribution device; one end of the secondary water and gas distribution device extends into the pebble cushion layer, and the other end extends into the backwash water inlet channel; the back washing water inlet channel is communicated with the clean water tank through a back water pipe, and the back washing water inlet channel (clean water collecting channel) is also communicated with the water seal tank through a clean water pipe.

Further, the secondary water and gas distribution device comprises: the air filter comprises a primary air cushion layer and a secondary air cushion layer, wherein a filter tube is arranged between the primary air cushion layer and the secondary air cushion layer;

the upper end of the filter tube is communicated with the secondary air cushion layer, and the lower end of the filter tube is communicated with the primary air cushion layer;

the filter tube is provided with an air cushion layer balance hole and an air inlet hole; the air cushion layer balance hole is positioned at the lower end of the filter tube, and the air inlet hole is positioned at the upper end of the air cushion layer balance hole;

the secondary gas cushion layer is positioned in the pebble cushion layer, and the primary gas cushion layer is positioned in the backwash water inlet channel;

further, the primary air cushion layer is rectangular in shape, and the secondary air cushion layer is triangular in shape;

compared with the prior art, the utility model has the beneficial effects that:

(1) According to the sewage zero discharge system of the water purification station, only one-time water inflow is needed, sludge discharged from the fluidized bed sedimentation tank and back flushing water discharged from the D-type filter tank are discharged into the sludge storage tank, sludge at the bottom of the sludge storage tank is lifted by the sludge pump and enters the sludge dehydrator for sludge dehydration, dehydrated sludge cakes are transported outwards, the dehydrated water enters the sludge storage tank again, supernatant fluid of the sludge storage tank is pumped into the raw water tank by the supernatant fluid reflux pump, so that sewage is purified and treated, no sewage is discharged outwards, zero discharge of sewage is realized, and water resources are saved;

(2) The sewage zero discharge system of the water purification station is suitable for municipal small and medium-sized water works, water purification stations and village drinking water; the system has the advantages of energy conservation and consumption reduction by arranging the raw water tank, the flocculation device, the fluidized bed sedimentation tank, the D-shaped filter tank, the water seal tank and the clean water tank which are sequentially communicated through pipelines, and has high sewage treatment efficiency; the water quality after sewage treatment is excellent, and the sewage and suspended matters in degradation (the removal rate is more than 98%), turbidity (the removal rate is more than 99%), COD (the removal rate is more than 50%), total phosphorus (the removal rate is more than 90%), chromaticity (the removal rate is more than 35%), heavy metals (the removal rate is more than 45%), iron (the removal rate is more than 40%), manganese (the removal rate is more than 40%), bacteria (the removal rate is more than 99%), and escherichia coli (the removal rate is more than 99%).

Drawings

The following drawings are illustrative of the utility model and are not intended to limit the scope of the utility model, in which:

FIG. 1 is a schematic diagram of a sewage zero discharge system of a water purification station provided by the utility model;

FIG. 2 is a schematic view of the structure of the mud-water separator in the present utility model;

FIG. 3 is a front view of a filter body provided by the utility model;

FIG. 4 is a top view of a filter body according to the present utility model;

FIG. 5 is a schematic structural view of a secondary water and gas distribution device provided by the utility model;

fig. 6 is a schematic structural view of a filter tube according to the present utility model.

Reference numerals: 1-a raw water tank; 2-a fluidized bed sedimentation tank; 21-a mixer; 22-a coagulation-assisting drug adding device; 23-a first flocculation dosing device; 24-a water collection tank; 25-a mud-water separator; 26-a reactor; 27-a mud layer; 3-D type filter tank; 31-a filter body; 32-a material leakage preventing device; 33-an adaptive frit layer; 34-pebble cushion; 35-a secondary water and gas distribution device; 36-a primary water and gas distribution device; 37-water inlet channel; 38-backwashing drainage channel; 40-primary air cushion layer; 41-a secondary air cushion layer; 42-filtering tube; 43-air cushion layer balance holes; 44-an air inlet; 4-water sealing the pool; 5-a clean water tank; 6-connecting blocks; 7-a mud storage pool; 8-a raw water lifting pump; 9-a first water inlet pipe; 10-backwashing an air inlet pipe; 11-backwashing a fan; 12-backwashing a water pump; 13-a water supply pump; 14-a disinfection dosing device, 15-a sludge dehydrator, 16-a supernatant reflux pump and 17-a second flocculation dosing device; 18-sludge pump, 19-flushing pipeline.

Detailed Description

The present utility model will be further described in detail with reference to the following specific examples, which are given by way of illustration, in order to make the objects, technical solutions, design methods and advantages of the present utility model more apparent. It should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the scope of the utility model.

As shown in fig. 1 to 6, the utility model provides a sewage zero discharge system of a water purification station, which comprises a raw water tank 1, a flocculation device, a fluidized bed sedimentation tank 2, a D-type filter tank 3, a water seal tank 4 and a clean water tank 5 which are connected in sequence through pipelines;

the outlet end of the raw water tank 1 is communicated with the inlet end of the fluidized bed sedimentation tank 2 through a first water inlet pipe 9, and a raw water lifting pump 8 is arranged on the first water inlet pipe 9;

the flocculation device is fixed on the outer side wall of the fluidized bed sedimentation tank 2, the flocculation device is communicated with the fluidized bed sedimentation tank 2 through a pipeline, and raw water enters the fluidized bed sedimentation tank to realize separation of mud and water after being subjected to flocculation treatment by the flocculation device;

the sediment outlet end of the fluidized bed sedimentation tank 2 is also connected with a mud storage tank 7; the clean water outlet end of the fluidized bed sedimentation tank 2 is connected with the water inlet of the D-shaped filter tank 3 through a pipeline; the backwashing air inlet pipe 10 is connected with the backwashing air inlet end of the D-shaped filter tank 3, and the backwashing water outlet end of the D-shaped filter tank 3 is communicated with the inlet end of the mud storage tank 7 through a pipeline;

a backwashing air inlet pipe 10 is arranged on the D-shaped filter tank 3, and a backwashing fan 11 is arranged on the backwashing air inlet pipe 10; a clear water pipe is arranged between the D-shaped filter tank 3 and the clear water tank 5, a clear water outlet end of the D-shaped filter tank 3 is communicated with an inlet end of the clear water tank 5 through the clear water pipe, a backwashing pipe is arranged on the clear water pipe, and a backwashing water pump 12 is arranged on the backwashing pipe;

the outlet end of the sludge storage tank 7 is provided with a sludge dewatering device, and the outlet end of the sludge storage tank 7 is connected with the sludge dewatering device through a pipeline and is used for realizing zero discharge of sewage;

a water supply pipe is arranged outside the clean water tank 5, the outlet end of the clean water tank 5 is communicated with an external water supply device through a pipeline, and a water supply pump 13 is arranged on the water supply pipe; the outlet end of the water supply pump 13 is also provided with a flushing device for supplementing water for the flocculation device and flushing the sludge dewatering machine 15;

a disinfection dosing device 14 is arranged outside the clean water tank 5, and the inlet end of the clean water tank 5 is also connected with the disinfection dosing device 14 through a pipeline;

the sludge dewatering device is used for dewatering sludge and refluxing supernatant, and comprises a sludge dewatering machine 15 and a supernatant reflux pump 16; the outlet end of the sludge storage tank 7 is respectively communicated with the sludge dewatering machine 15 and the inlet end of the supernatant fluid reflux pump 16 through a pipeline, the outlet end of the sludge dewatering machine 15 is connected with a conveying device and is used for outputting sludge to a designated place, and the outlet end of the supernatant fluid reflux pump 16 is communicated with the inlet end of the raw water tank 1 through a pipeline;

a sludge pump 18 is arranged on a connecting pipeline of the sludge storage tank 7 and the sludge dehydrator 15 and is used for pumping the sludge in the sludge storage tank 7 into the sludge dehydrator;

the flushing device comprises a flushing pipeline 19 and a second flocculation dosing device, the sludge dewatering device 15 comprises a sewage part inlet end and a sludge part outlet end, the inlet end of the flushing pipeline 19 is connected with the outlet end of the water supply pump 13, the outlet end of the flushing pipeline 19 is respectively connected with the sewage part inlet end, the sludge part outlet end and the inlet end of the flocculation dosing device, and the flushing pipeline 19 is used for flushing the dosing device and the sludge dewatering device, and the second flocculation dosing device is communicated between the outlet end of the flushing pipeline 19 and the sewage part inlet end;

the outlet end of the flushing pipeline 19 is communicated with the inlet end of the sewage part, so that the second flocculation chemical adding device is communicated with the inlet end of the sewage part; the device is used for further cleaning the flushing sludge dehydrator; the sewage machine is a spiral-wound sludge dewatering machine, and the model is FBDL-T; principle of sludge dewatering: the sludge dewatering process is completed through a conditioning stirring tank, a concentration system, sludge alarm clock distribution, sludge dewatering, filter disc cleaning, sludge cake discharging and the like;

wherein the flocculation device comprises a mixer 21, and a flocculation aid dosing device 22 and a flocculation dosing device 23 are arranged outside the mixer 21;

the fluidized bed sedimentation tank 2 comprises a sedimentation tank body, wherein a water collecting tank 24, a mud-water separator 25, a reactor 26 and a mud discharging layer 27 are fixedly connected between the inner side walls of the sedimentation tank body from top to bottom in sequence, and the mud discharging layer 27 is positioned at the bottom of the fluidized bed sedimentation tank 2;

a sludge discharge pipe is connected to the side wall of the sludge discharge layer 27, the sludge discharge layer 27 is communicated with the sludge storage tank 7 through the sludge discharge pipe, and a sludge pump is arranged on the sludge discharge pipe;

the coagulation-assisting chemical adding device 22 and the flocculation chemical adding device 23 are communicated with the water inlet of the mixer 21 through pipelines, the water outlet of the mixer 21 is communicated with the water inlet of the reactor 26 through pipelines, the water outlet of the reactor 26 is connected with the water inlet of the mud-water separator 25 for realizing mud-water separation, and the water outlet of the mud-water separator 25 is communicated with the water inlet of the water collecting tank 24 through pipelines for storing purified water; the water outlet of the water collecting tank 24 is communicated with the D-type filter tank 3 through a pipeline;

1-3, after raw water, flocculating agent and coagulant aid are mixed in a flocculation device, sewage is quickly formed into a floc under the action of hydrodynamic force, sludge with larger specific gravity flows downwards into a reactor 26, the reactor 26 comprises a reaction cylinder, a plurality of through holes are uniformly distributed on the side wall of the reaction cylinder and used for discharging the sludge into a sludge discharging layer 27, a mud-water separator 25 is a suspension area, the suspension area is used for balancing the sludge and water, when the balance is broken, the mud flows downwards according to the specific gravity, the water flows upwards, the mud-water separator is used for further mud-water separation, the mud-water separator is a clear water area above, the clear water flowing upwards is collected into a water collecting tank through saw teeth on the water collecting tank 24, and enters a water inlet channel 37 of a D-type filter tank 3 from a water outlet pipe after being collected, the water collecting tank 24 is a rectangular water collecting tank, and the upper part of the water collecting tank 24 is saw-tooth-shaped, so that clear water is better collected and prevented from overflowing;

wherein, a connecting block 6 is arranged between the sedimentation tank body and the reactor 26, the connecting block 6 is a cuboid connecting block 6, and the sedimentation tank body is fixedly connected with the reactor 26 through the connecting block 6;

wherein the mud-water separator 25 is a circular separator, and a plurality of first holes are uniformly distributed on the circular separator, and are distributed in a honeycomb shape;

wherein the mixer 21 comprises: a reaction box and a plurality of bulges;

the bulges are fixedly connected with the two opposite side walls inside the reaction box, and the bulges are arranged in a staggered manner; the water outlet of the mixer 21 is positioned at the bottom of the reaction box, and the water inlet of the mixer 21 is close to the top of the reaction box;

wherein, as shown in fig. 3-6; the D-type filter tank 3 includes: a filter body 31 and a secondary water and gas distribution device 35;

the filter tank comprises a filter tank body 31, a material leakage preventing device 32, a self-adaptive filter material layer 33, a pebble cushion layer 34 and a primary water and gas distribution device 36 are sequentially and fixedly arranged between the inner side walls of the filter tank body 31 from top to bottom, and the primary water and gas distribution device 36 is positioned at the bottom of the filter tank body 31;

a water inlet channel 37 and a backwash drain channel 38 are fixedly arranged on the inner side wall of the filter body 31, the water inlet channel 37 is positioned above the material leakage preventing device 32, the backwash drain channel 38 is positioned between the side wall of the filter body 31 and the side wall of the material leakage preventing device 32, and a port of the backwash drain channel 38 is higher than the upper surface of the material leakage preventing device 32; the water inlet channel 37 and the backwash water outlet channel 38 are respectively positioned on two opposite sides of the filter body 31;

the water outlet of the water collecting tank 24 is communicated with the water inlet channel 37 through a pipeline;

the water outlet of the backwash drain channel 38 is communicated with the mud storage tank 7 through a pipeline;

a backwashing water inlet channel is arranged in the primary water and gas distribution device 36; one end of the secondary water and gas distribution device 35 extends into the pebble cushion layer 34, and the other end extends into the backwash water inlet channel; the backwashing water inlet channel is communicated with the clean water tank 5 through a backwashing pipe, and is also communicated with the water seal tank 4 through a clean water pipe;

the raw water tank 1 is treated by a flocculation device and a fluidized bed sedimentation tank 2 to obtain purified water, the purified water enters a water inlet channel 37, then the water in the water inlet channel 37 flows through an anti-running device 32, a self-adaptive filter material layer 33, a pebble cushion layer 34 and a secondary water distribution and air distribution device 35 to be purified, the purified water enters a backwashing water inlet channel, the purified water firstly enters a water seal tank through a water outlet pipe and then enters a clean water tank from the water seal tank, the purified water in the clean water tank is conveyed into a water pipeline for users through a water supply pump and a water supply pipeline, and the anti-running device 32 is a steel wire mesh; the self-adaptive filter material layer 33 is a self-adaptive short fiber filter material;

after the purification is finished, backwashing is carried out, a backwashing lifting pump 12 and a backwashing fan 11 are opened, clean water in a clean water tank and gas in the backwashing fan 11 enter a backwashing water inlet channel through a backwashing air inlet pipe, then enter a secondary water and gas distribution device 35 through a filter pipe 42, then sequentially enter a backwashing water drainage channel 38 through the secondary water and gas distribution device 35, a pebble cushion layer 34, a self-adaptive filter material layer 33 and an anti-running device 32, and are discharged to a mud storage pond through a backwashing water drainage pipe.

Wherein, as shown in fig. 3; the secondary water and gas distribution device 35 includes: a primary air cushion layer 40 and a secondary air cushion layer 41, and a filter tube 42 is provided between the primary air cushion layer 40 and the secondary air cushion layer 41;

the upper end of the filter tube 42 is communicated with the secondary air cushion layer 41, and the lower end of the filter tube 42 is communicated with the primary air cushion layer 40;

the filter tube 42 is provided with an air cushion layer balance hole 43 and an air inlet hole 44; the air cushion layer balance hole 43 is positioned at the lower end of the filter tube 42, and the air inlet hole 44 is positioned at the upper end of the air cushion layer balance hole 43;

the secondary air cushion layer 41 is positioned inside the pebble cushion layer 34, and the primary air cushion layer 40 is positioned inside the backwash water inlet channel;

it should be noted that: the secondary water and air distribution device 35 comprises a primary air cushion layer 40 and a secondary air cushion layer 41, wherein the primary air cushion layer 40 is rectangular, the secondary air cushion layer 41 is triangular, a strip-shaped hole 43 and an air inlet hole 44 are arranged on a filter tube 42, the head (upper end) of the filter tube 42 is contacted with the secondary air cushion layer 41, the tail (lower end) of the filter tube is contacted with the primary air cushion layer 40, the head of the filter tube 42 is provided with a plurality of air outlet holes, the tail of the filter tube 42 is provided with a plurality of air inlet holes,

the air inlet and the strip-shaped holes are distributed on the side wall of the filter tube in a straight line, and the strip-shaped holes are positioned below the air inlet; when the air quantity is small and reaches the air quantity of the air inlet hole, the air starts to enter from the air inlet hole and goes out from the head part of the filter tube, so that the aeration function is realized; when the air quantity is large and the air inlet holes are insufficient, the air continuously spreads to the filter tube from the strip-shaped holes, the backwash function is realized, backwash water enters the filter tube from the strip-shaped holes after air washing, balance is achieved at the moment, and the primary air cushion layer 40 and the secondary air cushion layer 41 exist, so that the air distribution of the whole pool is uniform;

wherein the primary air cushion layer 40 has a rectangular shape, and the secondary air cushion layer 41 has a triangular shape; the sewage zero discharge system of the water purifying station is worth to be explained, sewage is not required to be treated for many times, and energy is saved and consumption is reduced; by arranging the flocculation device, the fluidized bed sedimentation tank and the D-type filter tank, the occupied area is reduced by more than 30%, the rising flow rate of the fluidized bed sedimentation tank can be 15-20m/h, the rising flow rate of the common inclined tube/inclined plate sedimentation tank is 6-9m/h, the filtering speed of the D-type filter tank can be 15-18m/h, and the filtering speed of the common V-type filter tank is 6-8m/h; the backwashing water consumption rate of the D-type filter tank is 0.2-0.3%, and the backwashing water consumption rate of the commonly used V-type filter tank is 1.5-2%, so that the water and the energy are saved; the D-type filter adopts the latest secondary balance water and gas distribution device, so that the water and gas distribution is very uniform, the single area can be 200 square meters, namely, the daily water yield of the single pond reaches 7 ten thousand tons/day, the occupied area is further reduced, and the equipment investment cost is further reduced; the system is used for purifying suspended matters (the removal rate is > 98%), turbidity (the removal rate is > 99%), COD (the removal rate is > 50%), total phosphorus (the removal rate is > 90%), chromaticity (the removal rate is > 35%), heavy metals (the removal rate is > 45%), iron (the removal rate is > 40%), manganese (the removal rate is > 40%), bacteria (the removal rate is > 99%), and escherichia coli (the removal rate is > 99%);

pilot data for a particular water purification station system is as follows:

water purification station apparatus pilot unit: (mg/L)

/>

/>

The complete workflow of the utility model may be: pumping raw water in a raw water tank 1 into a flocculation device through a raw water lifting pump 8, treating the raw water in the flocculation device and a fluidized bed sedimentation tank 2 to obtain purified water, enabling the purified water to enter a water inlet channel 37, enabling the water in the water inlet channel 37 to flow through a material leakage preventing device 32, a self-adaptive filter material layer 33, a pebble cushion 34 and a secondary water distribution gas distribution device 35, purifying, enabling the purified water to enter a backwashing water inlet channel (clear water collecting channel), enabling the purified water to enter a water seal tank through a water outlet pipe, enabling the purified water to enter the clear water tank from the water seal tank, enabling the purified water in the clear water tank to be conveyed into a water supply pipeline of a user through a water supply pump,

after the purification period is finished, backwashing is carried out, a backwashing lifting pump 12 and a backwashing fan 11 are opened, clean water in a clean water tank and gas in the backwashing fan 11 enter a water inlet channel through a backwashing water inlet pipe and a backwashing air inlet pipe respectively, then enter a secondary water and gas distribution device 35 through a filter pipe 42, then sequentially enter a secondary water and gas distribution device 35, a pebble cushion layer 34, a self-adaptive filter material layer 33 and an anti-running device 32, enter a backwashing drainage channel 38, and are discharged to a mud storage tank through a backwashing drainage pipe; the sludge dewatering device is used for dewatering the sludge and refluxing the supernatant;

the sludge discharged from the fluidized bed sedimentation tank 2 and the back flush water discharged from the D-type filter tank 3 are discharged into the sludge storage tank 7 by adding water once, the sludge in the sludge storage tank 7 is lifted by a sludge pump and then enters the sludge dehydrator 15 for sludge dehydration, dehydrated sludge cakes are transported outwards, the dehydrated water enters the sludge storage tank 7 again, and the supernatant of the sludge storage tank 7 is pumped into a raw water tank by a supernatant reflux pump 16.

The foregoing description of embodiments of the utility model has been presented for purposes of illustration and description, and is not intended to be exhaustive or limited to the embodiments disclosed. Many modifications and variations will be apparent to those of ordinary skill in the art without departing from the scope and spirit of the various embodiments described. The terminology used herein was chosen in order to best explain the principles of the embodiments, the practical application, or the technical improvements in the marketplace, or to enable others of ordinary skill in the art to understand the embodiments disclosed herein.

Claims (10)

1. A sewage zero release system of water purification station, its characterized in that: comprises a raw water tank (1), a flocculation device, a fluidized bed sedimentation tank (2), a D-type filter tank (3), a water seal tank (4) and a clean water tank (5) which are connected in sequence through pipelines;

the flocculation device is fixed on the outer side wall of the fluidized bed sedimentation tank (2), the flocculation device is communicated with the fluidized bed sedimentation tank (2) through a pipeline, and raw water enters the fluidized bed sedimentation tank to realize the separation of mud and water after the flocculation device performs flocculation treatment;

the sediment outlet end of the fluidized bed sedimentation tank (2) is also connected with a mud storage tank (7); the clean water outlet end of the fluidized bed sedimentation tank (2) is connected with the water inlet of the D-shaped filter tank (3) through a pipeline, a backwash air inlet pipe (10) is connected with the backwash air inlet end of the D-shaped filter tank (3), and the backwash water outlet end of the D-shaped filter tank (3) is communicated with the inlet end of the mud storage tank (7) through a pipeline;

a backwashing air inlet pipe (10) is arranged on the D-shaped filter tank (3), and a backwashing fan (11) is arranged on the backwashing air inlet pipe (10); a clear water pipe is arranged between the D-shaped filter tank (3) and the clear water tank (5), the clear water outlet end of the D-shaped filter tank (3) is communicated with the inlet end of the clear water tank (5) through the clear water pipe, a backwashing pipe is arranged on the clear water pipe, and a backwashing water pump (12) is arranged on the backwashing pipe;

the outlet end of the mud storage tank (7) is provided with a mud dewatering device, and the outlet end of the mud storage tank (7) is connected with the mud dewatering device through a pipeline and is used for realizing zero discharge of sewage;

a water supply pipe is arranged outside the clean water tank (5), the outlet end of the clean water tank (5) is communicated with an external water supply device through a pipeline, and a water supply pump (13) is arranged on the water supply pipe;

the outlet end of the water supply pump (13) is also provided with a flushing device for supplementing water for the flocculation device and flushing the sludge dewatering machine (15);

the disinfection dosing device (14) is arranged outside the clean water tank (5), and the inlet end of the clean water tank (5) is also connected with the disinfection dosing device (14) through a pipeline.

2. The system for zero sewage discharge in a water purification station according to claim 1, wherein: the sludge dewatering device comprises a sludge dewatering machine (15) and a supernatant return pump (16); the outlet end of the sludge storage tank (7) is respectively communicated with the inlet ends of the sludge dewatering machine (15) and the supernatant fluid reflux pump (16) through pipelines, the outlet end of the sludge dewatering machine (15) is connected with the conveying equipment and is used for outputting sludge to a designated place, and the outlet end of the supernatant fluid reflux pump (16) is communicated with the inlet end of the raw water tank (1) through a pipeline;

and a sludge pump (18) is arranged on a connecting pipeline of the sludge storage tank (7) and the sludge dewatering machine (15) and is used for pumping the sludge in the sludge storage tank into the sludge dewatering machine.

3. The system for zero sewage discharge in a water purification station according to claim 1, wherein: the flushing device comprises a flushing pipeline (19) and a second flocculation dosing device, the sludge dewatering machine (15) comprises a sewage part inlet end and a sludge part outlet end, the inlet end of the flushing pipeline (19) is connected with the outlet end of the water supply pump (13), the outlet end of the flushing pipeline (19) is respectively connected with the sewage part inlet end, the sludge part outlet end and the inlet end of the flocculation dosing device, and the flushing device is used for flushing the dosing device and the sludge dewatering machine, and the second flocculation dosing device is communicated between the outlet end of the flushing pipeline (19) and the sewage part inlet end.

4. The system for zero sewage discharge in a water purification station according to claim 1, wherein: the flocculation device comprises a mixer (21), and a coagulation-assisting and dosing device (22) and a flocculation and dosing device (23) are arranged outside the mixer (21);

the fluidized bed sedimentation tank (2) comprises a sedimentation tank body, wherein a water collecting tank (24), a mud-water separator (25), a reactor (26) and a mud discharging layer (27) are sequentially and fixedly connected between the inner side walls of the sedimentation tank body from top to bottom, and the mud discharging layer (27) is positioned at the bottom of the fluidized bed sedimentation tank (2);

a sludge discharge pipe is connected to the side wall of the sludge discharge layer (27), the sludge discharge layer (27) is communicated with the sludge storage tank (7) through the sludge discharge pipe, and a sludge pump is arranged on the sludge discharge pipe;

the coagulation-assisting and dosing device (22) and the flocculation-dosing device (23) are communicated with the water inlet of the mixer (21) through pipelines, the water outlet of the mixer (21) is communicated with the water inlet of the reactor (26) through pipelines, the water outlet of the reactor (26) is connected with the water inlet of the mud-water separator (25) for realizing mud-water separation, and the water outlet of the mud-water separator (25) is communicated with the water inlet of the water collecting tank (24) through pipelines for storing purified water; the water outlet of the water collecting tank (24) is communicated with the D-shaped filter tank (3) through a pipeline.

5. The system for zero sewage discharge in a water purification station according to claim 4, wherein: the fluidized bed sedimentation tank (2) and the reactor (26) are arranged between the fluidized bed sedimentation tank and the reactor (26), the connecting block (6) is a cuboid connecting block, and the fluidized bed sedimentation tank (2) and the reactor (26) are fixedly connected through the connecting block (6).

6. The system for zero sewage discharge in a water purification station according to claim 4, wherein: the mud-water separator (25) is a circular separator, a plurality of first holes are uniformly distributed on the circular separator, and the first holes are distributed in a honeycomb shape.

7. The system for zero sewage discharge in a water purification station according to claim 4, wherein: the mixer (21) comprises: a reaction box and a plurality of bulges;

the bulges are fixedly connected with the two opposite side walls inside the reaction box, and the bulges are arranged in a staggered manner; the water outlet of the mixer (21) is positioned at the bottom of the reaction box, and the water inlet of the mixer (21) is close to the top of the reaction box.

8. The system for zero sewage discharge in a water purification station according to claim 4, wherein: the D-shaped filter tank (3) comprises: a filter body (31) and a secondary water and gas distribution device (35);

the filter is characterized in that an anti-material-running device (32), a self-adaptive filter material layer (33), a pebble cushion layer (34) and a primary water and gas distribution device (36) are sequentially and fixedly arranged between the inner side walls of the filter body (31) from top to bottom, and the primary water and gas distribution device (36) is positioned at the bottom of the filter body (31);

a water inlet channel (37) and a backwash drainage channel (38) are fixedly arranged on the inner side wall of the filter body (31), the water inlet channel (37) is positioned above the material leakage preventing device (32), the backwash drainage channel (38) is positioned between the side wall of the filter body (31) and the side wall of the material leakage preventing device (32), and a port of the backwash drainage channel (38) is higher than the upper surface of the material leakage preventing device (32); the water inlet channel (37) and the backwash water outlet channel (38) are respectively positioned at two opposite sides of the filter body (31);

the water outlet of the water collecting tank (24) is communicated with the water inlet channel (37) through a pipeline;

the water outlet of the backwash drainage channel (38) is communicated with the mud storage tank (7) through a pipeline,

a backwashing water inlet channel is arranged in the primary water and gas distribution device (36); one end of the secondary water and gas distribution device (35) stretches into the pebble cushion layer (34), and the other end stretches into the backwash water inlet channel; the backwashing water inlet channel is communicated with the clean water tank (5) through a backwashing pipe, and the backwashing water inlet channel is communicated with the water seal tank (4) through a clean water pipe.

9. The system for zero sewage discharge in a water purification station according to claim 8, wherein: the secondary water and gas distribution device (35) comprises: a primary air cushion layer (40) and a secondary air cushion layer (41), and a filter tube (42) is arranged between the primary air cushion layer (40) and the secondary air cushion layer (41);

the upper end of the filter tube (42) is communicated with the secondary air cushion layer (41), and the lower end of the filter tube (42) is communicated with the primary air cushion layer (40);

an air cushion layer balance hole (43) and an air inlet hole (44) are formed in the filter tube (42); the air cushion layer balance hole (43) is positioned at the lower end of the filter tube (42), and the air inlet hole (44) is positioned at the upper end of the air cushion layer balance hole (43);

the secondary air cushion layer (41) is positioned inside the pebble cushion layer (34), and the primary air cushion layer (40) is positioned inside the backwash water inlet channel.

10. The system for zero sewage discharge in a water purification station according to claim 9, wherein: the primary air cushion layer (40) is rectangular in shape, and the secondary air cushion layer (41) is triangular in shape.

Images