CN111138029A

CN111138029A - Distributed rural sewage treatment device

Info

Publication number: CN111138029A
Application number: CN202010011309.6A
Authority: CN
Inventors: 胡家玮; 赵志明; 刘泳利; 罗振华; 王少峰
Original assignee: Lanzhou University of Technology
Current assignee: Lanzhou University of Technology
Priority date: 2020-01-06
Filing date: 2020-01-06
Publication date: 2020-05-12
Anticipated expiration: 2040-01-06
Also published as: CN111138029B

Abstract

The invention discloses a distributed rural sewage treatment device, and belongs to the technical field of sewage treatment. The device mainly comprises a sewage treatment device, an artificial wetland, an intelligent monitoring device and a power supply; according to the invention, through the organic combination of the biological treatment unit and the ecological treatment unit, the removal targets of organic matters, nitrogen and phosphorus can be realized with high efficiency and low consumption, so that the rural sewage treatment process can run efficiently, stably and at low cost, and the problem of the decrease of the single ecological treatment effect in the lower temperature period in winter is solved; the intelligent monitoring device is arranged to monitor rural sewage treatment elements at different positions in a unified manner, so that the operation and maintenance efficiency is improved, the operation working conditions of the sewage treatment elements at all positions can be observed conveniently, and the intelligent monitoring device has the advantages of intelligent integration, good sewage treatment effect and high reliability, and is suitable for large-scale popularization.

Description

Distributed rural sewage treatment device

Technical Field

The invention belongs to the technical field of sewage treatment, and particularly relates to a distributed rural sewage treatment device.

Background

With the implementation of new rural policies, rural economy in China is rapidly developed, the problem of environmental pollution, particularly water pollution, caused by the rural economy is increasingly prominent, and the improvement of the current situation of rural sewage treatment is particularly important. Sewage, livestock sewage, septic tank effluent, kitchen drainage, washing water and the like generated in the daily life of villagers, and the water quality of the sewage is characterized by containing higher organic pollutants, pathogenic microorganisms and more suspended substances. If not effectively treated, not only causes water environment pollution and damages to human health, but also causes damage to ecological environment and economic sustainable development.

Because rural domestic sewage is small in scale, large in change, dispersed and low in management level, the traditional sewage treatment process needs enough cost to support normal operation and is not suitable for rural sewage treatment, and the traditional sewage treatment device is low in intelligentization level, cannot monitor sewage treatment devices at different positions, cannot visually know the sewage treatment conditions of all places, and reduces operation and maintenance efficiency; the MBR membrane module can only be suitable for a reaction tank with a single size, and the traditional membrane bracket needs to be remanufactured when the reaction tank is replaced, so that the cost is increased; the running state of the MBR membrane module cannot be monitored, the fault cannot be found in time, and the sewage treatment effect is reduced.

Disclosure of Invention

Aiming at the problems, the invention provides the distributed rural sewage treatment device which is intelligent and integrated and has a good treatment effect.

The technical scheme of the invention is as follows: a distributed rural sewage treatment device mainly comprises a sewage treatment device, an artificial wetland communicated with the sewage treatment device and a power supply electrically connected with each electrical element;

the sewage treatment device comprises a water collecting adjusting tank, an anaerobic reaction tank, a facultative reaction tank, an aerobic MBR reaction tank and a separation equipment room, wherein the water collecting adjusting tank is used for pre-precipitating inlet water, the anaerobic reaction tank is internally provided with disc-shaped fillers, the facultative reaction tank is internally provided with an MBR membrane component and a sludge reflux pump, the separation equipment room is internally provided with a washing element, sludge discharge pipelines are respectively arranged in the anaerobic reaction tank, the facultative reaction tank and the aerobic MBR reaction tank, aeration devices are respectively arranged in the facultative reaction tank and the aerobic MBR reaction tank, the MBR membrane component comprises an MBR membrane bracket formed by sequentially connecting a plurality of MBR membrane brackets, an MBR membrane vertically arranged in the MBR membrane brackets, a width adjusting frame which is arranged between two adjacent MBR membrane brackets and is respectively provided with mounting clapboards fixedly connected with the MBR membrane brackets on the left side and the right side, the rest sides of the width adjusting frame are formed, waterproof plugging cloth covers the width adjusting frame;

the interior of the artificial wetland is sequentially provided with a plant layer, a sand-soil layer, a small stone layer and a large stone layer from top to bottom.

Furthermore, a cyclone sand setting device is arranged in the water collecting adjusting tank, and the inflow water is pretreated through the cyclone sand setting device, so that the sand content of a subsequent tank body is reduced, and the service life of the MBR membrane component is prolonged.

Furthermore, the anaerobic reaction tank, the facultative reaction tank and the aerobic MBR reaction tank are internally provided with an oxygen dissolving instrument for measuring oxygen content, and the oxygen dissolving instrument is favorable for strictly controlling aeration quantity and ensures that DO of the facultative reaction tank and the aerobic MBR reaction tank is proper.

Furthermore, sponge iron, zeolite, gravel and soil are adopted in the disc-shaped filler to form an organic porous composite filler, a biological system is combined, nitrogen and phosphorus in the polluted water are properly removed, proper filler combination and preparation are selected, and complementary effects among the fillers are utilized, so that the decontamination effect of the wetland is effectively improved, meanwhile, the blockage can be effectively avoided, and the operation period is prolonged.

Furthermore, the plants planted in the plant layer are cane shoots, canna and windmill grass, and different phosphorus removal plants are planted to form a complex ecosystem, so that the phosphorus removal effect of sewage is greatly improved.

Furthermore, the flushing element comprises an air blower, a backwashing pump and a suction pump which are connected with the MBR membrane component through connecting pipes, and an electric control system which is electrically connected with the air blower, the backwashing pump and the suction pump, water is pumped to the MBR membrane component through the backwashing pump to be soaked and self-cleaned, sodium hypochlorite is added in the cleaning process to increase the cleaning effect, then continuous aeration is carried out on the MBR membrane component through the air blower to vibrate cleaning liquid, the cleaning effect is further increased, timely cleaning of the MBR membrane component is completed, the cost for replacing the MBR membrane component is reduced as much as possible, and finally the cleaned water is lifted to the artificial wetland through the suction pump to be further purified.

Furthermore, still include intelligent monitoring device, intelligent monitoring device include carry out the remote intelligent system of unified control to the sewage treatment component of each department, with remote intelligent system passes through radio signal connection's controller, with controller electric connection and carry out the rivers velocity of flow probe that detects to the rivers velocity of flow of each reaction tank inlet tube department, with controller electric connection and carry out the electron pressure table that detects respectively to MBR membrane inlet outlet pressure, with controller electric connection and carry out the GPS of fixing a position to sewage treatment component everywhere, through the control system of above-mentioned intelligence integration, conveniently will be located rural sewage treatment component of different positions department and carry out unified control, improved operation maintenance efficiency, conveniently observe sewage treatment component's everywhere operation operating condition, increase sewage treatment process's intelligence and reliability.

Further, constructed wetland has the inside clear water disinfection pond that is equipped with sterilamp through the pipeline intercommunication, and intelligent monitoring device is still including locating in the clear water disinfection pond and to its inside water quality of water go on the quality of water detection analyzer that detects, will detect the water after unqualified and take out the backwash pump to the anaerobic reaction pond again, through detecting the sewage quality of water of handling, avoid quality of water unqualified to cause secondary pollution, guarantee the reliability of sewage treatment process.

Furthermore, be a plurality of bradyvalves that latticed distributes in the clear water disinfection pond, every the bradyvalve lateral wall evenly is equipped with a plurality of bradyorifices, and artificial wetland one end is kept away from in the clear water disinfection pond is equipped with the delivery port, sterilamp has a plurality ofly, evenly establishes respectively in clear water disinfection pond bottom surface and is located every grid region of the aforesaid, rivers from clear water disinfection pond one end entering, then get into different grid regions through a plurality of bradyorifices, disinfect its inside rivers through sterilamp in every grid region, after a plurality of grid regions and go on disinfecting many times, from the clear water disinfection pond from the delivery port outflow can, through setting up a plurality of bradyvalves, increase the route of flowing through of rivers, make rivers disinfect through a plurality of sterilamp, and the bactericidal effect is improved, satisfies the demand that discharges after the sewage treatment.

The method for filtering the wastewater by using the wastewater filtering device mainly comprises the following steps:

(1) the MBR membrane assembly is placed in a direction perpendicular to the water flow, the MBR membrane sub-supports at the two extreme ends are pulled according to the width of the aerobic MBR reaction tank, so that the width of each width adjusting frame is correspondingly adjusted, and finally the MBR membrane sub-supports at the two extreme ends are respectively contacted with the side walls at the two extreme ends of the aerobic MBR reaction tank, wherein the width adjustment of the width adjusting frames is realized by adjusting the distance between each adjusting rod through each rotating connecting piece, so that the width of the whole width adjusting frame is adjusted;

(2) after being collected by a pipe network, domestic sewage firstly enters a cyclone sand setting device to pretreat inlet water to reduce the sand content of a subsequent tank body, then enters a water collecting adjusting tank to homogenize water quality and water quantity and degrade partial organic matters to remove large solid particle substances, then enters an anaerobic reaction tank, carries a large amount of anaerobic microorganisms through organic porous composite filler to nitrify the sewage so as to decompose and convert various complex organic matters, then enters a facultative reaction tank, simultaneously carries out aerobic and anaerobic treatments on the organic matters in the wastewater under the action of a large amount of facultative microorganisms to play a role in denitrification, the sewage treated by the facultative reaction tank flows into an aerobic MBR reaction tank, and substances with larger particle sizes such as suspended matters, bacteria, colloids and particles in the water are removed by utilizing the filtering action of an MBR membrane;

(3) the water body treated by the aerobic MBR reaction tank enters the artificial wetland, phosphorus removal is carried out on the water body through the plant layer, and phosphorus in the sewage is adsorbed through the filtering and adsorbing effects of the sand layer, the small stone layer and the large stone layer, so that the sewage phosphorus removal effect is enhanced;

(4) when the MBR membrane is blocked after being used for a long time, pumping water in the separation equipment room to the MBR membrane component through a back-flushing pump to perform soaking and self-cleaning on the water, adding sodium hypochlorite in the cleaning process to increase the cleaning effect, continuously aerating the MBR membrane component through an air blower to vibrate cleaning liquid, further increasing the cleaning effect, and finishing timely cleaning the MBR membrane component;

(5) in the process, as the sewage treatment distribution in rural areas is dispersed, the states of the sewage treatment elements in all places can be uniformly monitored by the intelligent monitoring device, and the process specifically comprises the following steps: the water flow velocity probe is used for detecting the water flow velocity of the water inlet pipe of each reaction tank, so that the condition that the water flow velocity flowing into each reaction tank is too high to cause insufficient sewage treatment is avoided, the pressure of the water inlet and the water outlet of the MBR membrane is detected through the electronic pressure gauge, the condition of the MBR membrane is conveniently monitored in real time, the condition that the pressure difference of the water inlet and the water outlet is increased due to the MBR membrane is avoided, the positions of sewage treatment elements at all places are positioned through the GPS, the fault maintenance time is shortened, bacteria which are completely treated in the treated water flow are killed through the clear water disinfection tank, the water quality of the sewage treated by the sewage treatment device is detected through the water quality detection analyzer, and the effluent;

(6) after sewage is treated by a series of treatment units, the sewage flows into the clear water disinfection tank automatically after being collected by the artificial wetland water collecting pipeline, and after being sterilized for a plurality of times by the plurality of flow slowing plates, bacteria and viruses in the water body are killed and removed effectively, so that the treated water can reach the standard and be discharged for safe use.

The invention has the beneficial effects that: the invention provides a distributed rural sewage treatment device, which has the following advantages:

1. the invention can realize the removal of organic matters, nitrogen and phosphorus with high efficiency and low consumption by organically combining the biological treatment unit and the ecological treatment unit, so that the rural sewage treatment process can be operated with high efficiency, stability and low cost, and the problem of the reduction of the single ecological treatment effect in the period of low temperature in winter is solved.

2. The device adopts an integrated FRP structure, can be placed on the ground or buried underground, has small occupied area, high construction speed, investment saving and low operating cost, and is suitable for the economic bearing capacity of rural areas in various regions; meanwhile, the sewage treatment device has high operation automation degree, simple and convenient management, automatic system operation and no need of special management, can ensure that microorganisms are completely intercepted in the bioreactor, and is beneficial to the interception and growth of microorganisms with slow increment, such as nitrobacteria, so that the nitrification efficiency is improved, the device can operate under high volume load and low sludge load, the yield of residual sludge is low, the sludge treatment cost is reduced, and the effluent quality is good.

3. According to the invention, the width adjusting frame is arranged, so that the MBR membrane component can meet the requirements of aerobic MBR reaction tanks with different widths, the application range is wide, the problem that the traditional MBR membrane component has a fixed membrane support and can only be applied to a reaction tank with a single size is solved, and the traditional membrane support needs to be remanufactured when the reaction tank is replaced, so that the cost is increased.

4. According to the invention, the MBR membrane is cleaned at regular time by the flushing element, the cleaning effect is increased by adding sodium hypochlorite in the cleaning process, and meanwhile, the pressure of the water inlet and the water outlet of the MBR membrane is detected by the electronic pressure gauge, so that the state of the MBR membrane can be monitored in real time conveniently, the phenomenon that the MBR membrane is blocked due to untimely cleaning and the sewage treatment effect is influenced is avoided, the flushing element and the electronic pressure gauge provide double guarantee for the working state of the MBR membrane, and the reliability of the whole device is increased.

5. The intelligent monitoring device is arranged to uniformly monitor rural sewage treatment elements at different positions, so that the operation maintenance efficiency is improved, the operation working conditions of the sewage treatment elements at all positions can be conveniently observed, the flow velocity of water at the water inlet pipe of each reaction tank is detected through the water flow velocity probe, the problem that the sewage treatment is insufficient due to the fact that the flow velocity of water flowing into each reaction tank is too high is avoided, the elements of the sewage treatment devices at all positions are positioned through the GPS, the fault maintenance time is shortened, the quality of treated sewage is detected through the water quality detection analyzer, secondary pollution caused by unqualified water quality is avoided, and the reliability of the sewage treatment process is guaranteed.

6. A plurality of slow flow plates that are latticed distribution in the disinfection pond through the clear water increase the route that flows through of rivers, prolong rivers dwell time in each grid region, increase sterilamp simultaneously to the bactericidal time of rivers, improved bactericidal effect, satisfy the demand that discharges behind the sewage treatment.

Drawings

FIG. 1 is a schematic structural view of the present invention;

FIG. 2 is a schematic view of the filter element of the present invention;

FIG. 3 is an electrical connection diagram of the present invention;

FIG. 4 is a top view of the interior of the disinfection tank for fresh water according to the present invention.

Wherein, 1-sewage treatment device, 10-water collecting adjusting tank, 100-cyclone sand setting device, 11-anaerobic reaction tank, 110-disc-shaped filler, 12-facultative reaction tank, 13-aerobic MBR reaction tank, 130-MBR membrane module, 1300-MBR membrane bracket, 1301-MBR membrane bracket, 131-sludge reflux pump, 1302-MBR membrane, 1303-width adjusting frame, 1304-installing clapboard, 1305-adjusting rod, 1306-rotating connecting piece, 1307-waterproof blocking cloth, 131-sludge reflux pump, 14-separation equipment room, 140-flushing element, 1400-blower, 1401-backwash pump, 1402-suction pump, 15-sludge discharge pipeline, 16-aeration device, 17-dissolved oxygen instrument, 2-artificial wetland, 20-plant layer, 21-sandy soil layer, 22-small stone layer, 23-large stone layer, 3-intelligent monitoring device, 30-remote intelligent system, 31-controller, 32-water flow rate probe, 33-electronic pressure gauge, 34-GPS, 35-water quality detection analyzer, 36-reflux pump, 4-clear water disinfection pool, 40-ultraviolet germicidal lamp, 41-current buffer plate, 410-current buffer hole and 42-water outlet.

Detailed Description

Example 1

A decentralized rural sewage treatment device as shown in fig. 1, which mainly comprises a sewage treatment device 1, an artificial wetland 2 communicated with the sewage treatment device 1, and a power supply electrically connected with each electrical element;

the sewage treatment device 1 comprises a water collection adjusting tank 10 for pre-precipitating inlet water, an anaerobic reaction tank 11 with a disc-shaped filler 110 arranged inside, a facultative reaction tank 12, an aerobic MBR reaction tank 13 with an MBR membrane component 130 and a sludge reflux pump 131 arranged inside, and a separation equipment room 14 with a flushing element 140 arranged inside, wherein sponge iron, zeolite, gravel and soil are adopted in the disc-shaped filler 110 to form an organic porous composite filler, and the organic porous composite filler is combined with a biological system to suitably remove nitrogen and phosphorus in polluted water; sludge discharge pipelines 15 are arranged in the anaerobic reaction tank 11, the facultative reaction tank 12 and the aerobic MBR reaction tank 13, aeration devices 16 are arranged in the facultative reaction tank 12 and the aerobic MBR reaction tank 13, a cyclone sand settling device 100 is arranged in the water collection adjusting tank 10, and inflow water is pretreated through the cyclone sand settling device 100, so that the sand content of a subsequent tank body is reduced, the service life of an MBR membrane module 130 is prolonged, wherein the cyclone sand settling device 100 is XLC1080 in model number; an oxygen dissolving instrument 17 for measuring oxygen content is arranged in each of the anaerobic reaction tank 11, the facultative reaction tank 12 and the aerobic MBR reaction tank 13, the oxygen dissolving instrument 17 is favorable for strictly controlling aeration quantity, the DO of the facultative reaction tank 12 and the DO of the aerobic MBR reaction tank 13 are ensured to be proper, and the model number of the oxygen dissolving instrument 17 is HI9146 dissolved oxygen tester; as shown in fig. 2, the MBR membrane module 130 includes an MBR membrane support 1301 formed by sequentially connecting 3 MBR membrane sub-supports 1300, an MBR membrane 1302 vertically installed in the MBR membrane sub-supports 1300, and a width adjusting frame 1303 disposed between two adjacent MBR membrane sub-supports 1300 and having installation partition plates 1304 fixedly connected to the MBR membrane sub-supports 1300 on left and right sides thereof, wherein the rest sides of the width adjusting frame 1303 are formed by crossing 15 adjusting rods 1305, a rotating connector 1306 is disposed at the crossing position of each two adjusting rods 1305, and waterproof plugging cloth 1307 is covered outside the width adjusting frame 1303;

the inside of the artificial wetland 2 is provided with a plant layer 20, a sand layer 21, a small stone layer 22 and a large stone layer 23 from top to bottom in sequence, plants planted in the plant layer 20 are cane shoots, canna and windmill grass, and different phosphorus removal plants are planted to form a complex ecosystem, so that the phosphorus removal effect of sewage is greatly improved.

Example 2

Example 2 is essentially the same as example 1, except that:

the flushing element 140 comprises a blower 1400, a back flushing pump 1401 and a suction pump 1402 which are connected with the MBR membrane module 130 through connecting pipes, and an electric control system which is electrically connected with the blower 1400, the back flushing pump 1401 and the suction pump 1402, wherein water is pumped to the MBR membrane module 130 through the back flushing pump 1401 to perform soaking and self-cleaning, sodium hypochlorite is added in the cleaning process to increase the cleaning effect, then the blower 1400 continuously aerates the MBR membrane module 130 to vibrate the cleaning liquid, the cleaning effect is further increased, timely cleaning of the MBR membrane module 130 is completed, the cost for replacing the MBR membrane module 130 is reduced as much as possible, finally the cleaned water is lifted to the artificial wetland 2 through the suction pump 1402 to be further purified, in order to ensure normal operation of the equipment and reduce replacement of the MBR membrane module 130 as much as possible, an aeration device 16 and the back flushing pump 1401 are added, and the sodium hypochlorite is, the MBR membrane module 130 is soaked and self-cleaned, after the MBR membrane module 130 is treated, the effluent is lifted by a suction pump 1402 and discharged into the constructed wetland 14 for further purification, and the MBR membrane 1302 adopts a hollow fiber membrane, so that the hollow fiber membrane has narrow pore size distribution, high porosity, super-hydrophilicity, low pollution, high membrane flux and better pollution resistance; good mechanical stability and no wire breakage phenomenon; the cleaning method is more convenient and the cleaning period is longer; the system has the advantages of long service life, low operating cost, high-efficiency solid-liquid separation capability of the hollow fiber membrane, high sludge concentration and capability of intercepting activated sludge in the aerobic MBR reaction tank 13, and great improvement on the treatment efficiency of microorganisms, wherein the type of the air blower 1400 is 3L50WD/WC, the type of the backwashing pump 1401 is a 3DK-S high-pressure pump, and the suction pump 1402 is a TD/TP acid-alkali-resistant vertical suction pump.

Example 3

Example 3 is essentially the same as example 2, except that:

the artificial wetland 2 is communicated with a clear water disinfection tank 4 which is internally provided with an ultraviolet germicidal lamp 40 through a pipeline, and the quality of the treated sewage is detected, so that the secondary pollution caused by unqualified water quality is avoided, and the reliability of the sewage treatment process is ensured;

the device also comprises an intelligent monitoring device 3, the intelligent monitoring device 3 comprises a remote intelligent system 30 for uniformly monitoring sewage treatment elements at each position, a controller 31 connected with the remote intelligent system 30 through wireless signals, a water flow velocity probe 32 electrically connected with the controller 30 and used for detecting the water flow velocity at each reaction tank water inlet pipe, an electronic pressure gauge 33 electrically connected with the controller 30 and used for respectively detecting the pressure of the MBR membrane 1302 water inlet and outlet, a GPS34 electrically connected with the controller 30 and used for positioning each sewage treatment element, a water quality detection analyzer 35 arranged in the clear water disinfection tank 4 and used for detecting the water quality of the water inside the clear water disinfection tank, and a reflux pump 36 used for pumping the unqualified water into the anaerobic reaction tank 11, and rural sewage treatment elements at different positions are conveniently and uniformly monitored through the intelligent integrated control system, the operation maintenance efficiency is improved, the operation working conditions of sewage treatment elements at each position can be conveniently observed, and the intelligence and the reliability of the sewage treatment process are improved, wherein the controller 30 adopts an STM32 single chip microcomputer, the water flow rate probe 32 is ZH7647, the electronic pressure gauge 33 is ACD-Z3, and the water quality detection analyzers 35 are four, namely an LB-1000C COD online analyzer, an LB-1000N ammonia online analyzer, an LB-1000TP total phosphorus online analyzer and an LB-1000TN total nitrogen online analyzer.

Example 4

Example 4 is essentially the same as example 3, except that:

6 slow flow plates 41 which are distributed in a grid shape are arranged in the clean

water disinfection tank

4, 15 slow flow holes 410 are uniformly arranged on the side wall of each slow flow plate 41, a water outlet 42 is arranged at one end of the clean water disinfection tank 4, which is far away from the artificial wetland 2, 16 ultraviolet sterilizing lamps 40 are respectively and uniformly arranged at the bottom surface of the clean water disinfection tank 4 and are positioned in each grid area, water flow enters from one end of the clean water disinfection tank 4, then enters different grid areas through 15 slow flow holes 410, the water flow in each grid area is sterilized by the ultraviolet germicidal lamp 40 in each grid area, passes through 12 grid areas and is sterilized for multiple times, and then flows out from the water outlet 42 from the clear water disinfection tank 4, through setting up 6 unhurried current boards 41, increase the route that flows through of rivers, make rivers disinfect through 16 sterilamp 40, improved bactericidal effect, satisfy the demand that discharges after the sewage treatment.

(1) the MBR membrane modules 130 are placed in a direction perpendicular to the water flow direction, the MBR membrane sub-supports 1300 at the two extreme ends are pulled according to the width of the aerobic MBR reaction tank 13, so that the width of each width adjusting frame 1303 is correspondingly adjusted, and finally the MBR membrane sub-supports 1300 at the two extreme ends are respectively contacted with the side walls at the two extreme ends of the aerobic MBR reaction tank 13, wherein the width adjustment of the width adjusting frame 1303 is realized by adjusting the distance between each adjusting rod 1305 through each rotating connecting piece 1306, so that the width of the whole width adjusting frame 1303 is adjusted;

(2) after being collected by a pipe network, domestic sewage firstly enters a cyclone sand setting device 100 to pretreat inlet water to reduce the sand content of a subsequent tank body, then enters a water collection regulating tank 10 to homogenize water quality and water quantity and degrade partial organic matters to remove large solid particle substances, then enters an anaerobic reaction tank 11 to carry a large amount of anaerobic microorganisms through organic porous composite filler to nitrify the sewage, so that various complex organic matters are decomposed and converted, and then enters a facultative reaction tank 12 to simultaneously carry out aerobic and anaerobic treatments on the organic matters in the wastewater under the action of a large amount of facultative microorganisms, so that the denitrification effect is achieved, the sewage treated by the facultative reaction tank 12 flows into an aerobic MBR reaction tank 13, and substances with larger particle sizes such as suspended matters, bacteria, colloids and particles in the water are removed by utilizing the filtering effect of an MBR (membrane 1302);

(3) the water treated by the aerobic MBR reaction tank 13 enters the artificial wetland 2, phosphorus removal is carried out on the water through the plant layer 20, and phosphorus in the sewage is adsorbed through the filtering and adsorbing effects of the sand layer 21, the small stone layer 22 and the large stone layer 23, so that the sewage phosphorus removal effect is enhanced;

(4) when the MBR membrane 1302 is blocked after being used for a long time, a water body in the separation equipment room 14 is pumped to the MBR membrane module 130 through the back-flushing pump 1401 to be soaked and self-cleaned, sodium hypochlorite is added in the cleaning process to increase the cleaning effect, then the air blower 1400 continuously aerates the MBR membrane module 130 to vibrate the cleaning liquid, the cleaning effect is further increased, and the MBR membrane module 130 is cleaned in time;

(5) in the process, as the sewage treatment distribution in rural areas is dispersed, the states of the sewage treatment elements in all places can be uniformly monitored by the intelligent monitoring device 3, and the process specifically comprises the following steps: the water flow velocity of the water inlet pipe of each reaction tank is detected by the water flow velocity probe 32, the condition that the water flow velocity of the water flowing into each reaction tank is too high to cause insufficient sewage treatment is avoided, the pressure of the water inlet and the water outlet of the MBR membrane 1302 is detected by the electronic pressure gauge 33, the condition of the MBR membrane 1302 is conveniently monitored in real time, the pressure difference of the water inlet and the water outlet is prevented from rising due to the MBR membrane 1302, the positions of sewage treatment elements at all places are positioned by the GPS34, the fault maintenance time is shortened, bacteria which are treated cleanly in the treated water flow are killed by the clear water disinfection tank 4, the water quality of the sewage treated by the sewage treatment device 1 is detected by the water quality detection analyzer 35, and the effluent turbidity is ensured;

(6) after the sewage is treated by a series of treatment units, the sewage flows into the clear water disinfection tank 4 automatically after being collected by the artificial wetland water collecting pipeline, and is sterilized for a plurality of times by the buffer plates 41, so that bacteria and viruses in the water body are killed and removed effectively, the treated water can reach the standard and be discharged for safe use.

Examples of the experiments

Rural domestic sewage is taken as raw water, the sampling quantity is 150L, repeated sampling is carried out for 6 times, three groups are experimental groups, the other three groups are control groups, the rural domestic sewage of the experimental groups is treated by the sewage treatment device, the rural domestic sewage of the control groups is treated by the existing sewage treatment device, the rural domestic sewage treatment conditions under the water temperatures of 28 ℃, 32 ℃ and 35 ℃ are respectively measured by the three experimental groups, and the rural domestic sewage purification treatment effect table is obtained by the three control groups.

Table 1: rural domestic sewage treatment effect table

And (4) conclusion: as can be seen from Table 1, the followingAfter the sewage treatment device of the invention is used for treating the raw water of the experimental group, COD and NH in the water₃The contents of-N, TN and TP are obviously lower than the contents of various indexes in the water treated by the control group, which shows that the sewage treatment effect of the sewage treatment device of the invention is obviously superior to that of the sewage treatment device of the prior art, and the effect is the best at 32 ℃.

Claims

1. A distributed rural sewage treatment device is characterized by mainly comprising a sewage treatment device (1), an artificial wetland (2) communicated with the sewage treatment device (1), and a power supply electrically connected with each electrical element;

the sewage treatment device (1) comprises a water collection adjusting tank (10) which is communicated in sequence and used for pre-precipitating inlet water, an anaerobic reaction tank (11) with a disc-shaped filler (110) arranged inside, a facultative reaction tank (12), an aerobic MBR reaction tank (13) with an MBR membrane component (130) and a sludge reflux pump (131) arranged inside, and a separation equipment room (14) with a flushing element (140) arranged inside, wherein sludge discharge pipelines (15) are arranged in the anaerobic reaction tank (11), the facultative reaction tank (12) and the aerobic MBR reaction tank (13), aeration devices (16) are arranged in the facultative reaction tank (12) and the aerobic MBR reaction tank (13), the MBR membrane component (130) comprises MBR membrane supports (1301) which are formed by sequentially connecting a plurality of MBR membrane supports (1300), an MBR membrane (1302) vertically arranged in the MBR membrane supports (1300), and an installation which is arranged between two adjacent MBR membrane supports (1300) and is fixedly connected with the MBR membrane supports (1300) respectively on the left side and the right side The width adjusting device comprises a width adjusting frame (1303) provided with a partition plate (1304), the rest side surfaces of the width adjusting frame (1303) are formed by intersecting a plurality of adjusting rods (1305), a rotating connecting piece (1306) is arranged at the intersection of every two adjusting rods (1305), and waterproof plugging cloth (1307) is covered outside the width adjusting frame (1303);

the artificial wetland (2) is internally provided with a plant layer (20), a sand layer (21), a small stone layer (22) and a large stone layer (23) from top to bottom in sequence.

2. The decentralized rural sewage treatment plant according to claim 1, wherein a cyclone sand settler (100) is arranged in the water collecting and adjusting tank (10).

3. The decentralized rural sewage treatment plant according to claim 1, wherein dissolved oxygen meters (17) for measuring oxygen content are disposed in the anaerobic reaction tank (11), the facultative reaction tank (12) and the aerobic MBR reaction tank (13).

4. The decentralized rural sewage treatment plant according to claim 1, wherein sponge iron, zeolite, gravel and soil are used in the disc-shaped packing (110) to form an organic porous composite packing, and a biological system is combined to suitably remove nitrogen and phosphorus in the polluted water.

5. The decentralized rural waste water treatment plant according to claim 1, wherein the plants planted in the plant layer (20) are cane shoots, canna, and windmill grass.

6. The decentralized rural sewage treatment plant according to claim 1, wherein the flushing element (140) comprises a blower (1400), a backwash pump (1401) and a suction pump (1402) connected to the MBR membrane module (130) through connection pipes, and an electronic control system electrically connected to the blower (1400), the backwash pump (1401) and the suction pump (1402).

7. The decentralized rural sewage treatment plant according to claim 1, further comprising an intelligent monitoring device (3), wherein the intelligent monitoring device (3) comprises a remote intelligent system (30) for uniformly monitoring sewage treatment elements at various positions, a controller (31) connected with the remote intelligent system (30) through wireless signals, a water flow rate probe (32) electrically connected with the controller (30) and used for detecting the water flow rate at the water inlet pipe of each reaction tank, an electronic pressure gauge (33) electrically connected with the controller (30) and used for respectively detecting the water inlet and outlet pressures of the MBR membrane (1302), and a GPS (34) electrically connected with the controller (30) and used for positioning the sewage treatment elements at various positions.

8. The decentralized rural sewage treatment device according to claim 7, wherein the artificial wetland (2) is communicated with a clear water disinfection tank (4) provided with an ultraviolet germicidal lamp (40) inside through a pipeline, the intelligent monitoring device (3) further comprises a water quality detection analyzer (35) which is arranged in the clear water disinfection tank (4) and detects the water quality of the water body in the clear water disinfection tank, and a reflux pump (36) which pumps the water body which is unqualified in detection into the anaerobic reaction tank (11) again.