CN111517562A

CN111517562A - Biological flocculation technology coupled aeration algae pond sewage treatment system

Info

Publication number: CN111517562A
Application number: CN202010259557.2A
Authority: CN
Inventors: 李锋; 张饮江; 杜佳沐; 姬芬; 张宁
Original assignee: Shanghai Zhonghui Water Ecological Technology Co ltd
Current assignee: Shanghai Zhonghui Water Ecological Technology Co ltd
Priority date: 2020-04-03
Filing date: 2020-04-03
Publication date: 2020-08-11

Abstract

The invention discloses a sewage treatment system for a biological flocculation technology coupled with an aeration algae pond, belonging to the technical field of rural sewage treatment; the system comprises a grid pond, a grit chamber, an adjusting tank, a biological flocculation reaction tank, an aeration algae pond, a fast filter tank, a disinfection pond, a sampling port and a dewatering machine room, the biological flocculation reaction tank is divided into a biological flocculation tank, an intermediate sedimentation tank and a biological filter tank, one end of the grid pond is a domestic sewage inlet end, the other end is through the grit chamber, the adjusting tank is connected with the biological flocculation tank, the biological filter tank is through the aeration algae pond, the fast filter tank is connected with the disinfection pond, be provided with a lattice slag elevator pump in the grid pond, the grit chamber bottom is provided with a sludge elevator pump, the intermediate sedimentation tank is provided with a floc elevator pump, the sampling port is equipped with in the drain pipe of the disinfection pond. The invention has reasonable structural design, suspended colloidal substances adsorbed and flocculated by suspended microorganisms in the sewage are precipitated in the intermediate sedimentation tank, and the phenomenon of easy blockage of the subsequent oxidation treatment of the biological filter is greatly reduced.

Description

Biological flocculation technology coupled aeration algae pond sewage treatment system

Technical Field

The invention belongs to the technical field of rural sewage treatment, and particularly relates to a sewage treatment system with a biological flocculation technology coupled with an aeration algae pond, which has a more remarkable treatment effect on rural domestic sewage.

Background

At present, sewage in urban areas of China is basically brought into a sewer network and is conveyed to a large-scale sewage treatment plant for centralized treatment, the technical capacity of sewage treatment reaches a certain level, and the flocculation technology is widely applied as an important basic operation unit. Along with the implementation of sustainable development strategy and environmental protection policy of China, water pollution conditions in urban areas are increasingly emphasized, particularly sewage generated in rural areas, tourist attractions and agricultural sightseeing parks has the characteristics of generating and dispersing sewage and not being brought into a sewer network, a dispersed sewage treatment technology is generated aiming at the characteristic, and as the sewage is treated and then discharged into water bodies received by rivers and lakes, higher requirements on the safety of flocculating agents are provided, and the biological flocculation strengthening technology provides effective guarantee for the safe and efficient operation of sewage treatment facilities.

The flocculation technology of municipal sewage generally changes the surface characteristics of colloidal particles by adding an inorganic flocculant or an organic polymeric flocculant, so that the colloidal particles dispersed in the sewage are aggregated to form large particles to precipitate or float, and secondary pollution can be brought to the environment in the use process. For example, the use of inorganic flocculant can cause residual metal ions in the treated water, and simultaneously generate a large amount of sludge containing iron and aluminum, so that the treatment difficulty is high. Artificially synthesized polymeric flocculants such as polyacrylamide are difficult to degrade, and the residual teratogenic, carcinogenic and mutagenic effects of the monomers are also worried about. The biological flocculant has the characteristics of easy biodegradation and low influence on the ecological environment, is suitable for flocculation treatment of dispersed sewage, and is widely concerned.

In the prior art, the rural sewage treatment method based on the biological flocculation technology has the defects that firstly, suspended microorganisms in sewage adsorb and flocculate suspended colloidal substances, so that the subsequent oxidation treatment of a biological filter tank is easy to have the blockage phenomenon; secondly, the flocculating agent is easy to quickly run off along with water after being added, and the operation cost is high.

Disclosure of Invention

The invention aims to overcome the problems in the prior art and provides a sewage treatment system for a biological flocculation technology coupled with an aeration algae pond.

In order to achieve the technical purpose and achieve the technical effect, the invention is realized by the following technical scheme:

a sewage treatment system of a biological flocculation technology coupled aerated algae pond comprises a grid pond, a grit chamber, an adjusting tank, a biological flocculation reaction tank, an aerated algae tank, a rapid filter tank, a disinfection tank, a sampling port and a dewatering machine room, wherein the biological flocculation reaction tank is divided into three grids, the first grid is a biological flocculation tank, the second grid is an intermediate sedimentation tank, the third grid is a biological filter tank, and part of sludge in the intermediate sedimentation tank enters the biological filter tank to react and then flows back to the biological flocculation tank; the one end in grid pond is domestic sewage and gets into the end, and the other end is connected through the grit chamber, the equalizing basin that has the hydrolysis acidification effect and the biological flocculation pond in the biological flocculation reaction pond, the biological filter of biological flocculation reaction pond is connected through aeration algae pond, fast filtering pond and disinfection pond, be provided with the check sediment elevator pump of being convenient for carry the check sediment of interception to the dehydration computer lab in the grid pond, grit bottom of the pool portion is provided with the mud elevator pump of being convenient for carry mud to the dehydration computer lab in, the biological flocculation reaction pond is located middle sedimentation tank and is equipped with the floc elevator pump of being convenient for carry unnecessary mud and floc to the dehydration computer lab in, be equipped with the sampling opening of being convenient for detect the water sample in the drain pipe of disinfection pond.

Further, in the sewage treatment system with the biological flocculation technology coupled with the aeration algae pond, sludge in the biological flocculation pond is in a suspension state through mechanical stirring, and the concentration of the sludge is 1-5 g/L; the hydraulic retention time of the biological flocculation tank is 1-3 h. The sludge is domesticated activated sludge, and the domestication method is to gradually increase the proportion of industrial wastewater in the mixed liquor until the full load and high treatment efficiency required by specific wastewater are achieved. In the acclimation process, microorganisms capable of decomposing wastewater are developed, and microorganisms incapable of adapting to the wastewater are gradually eliminated.

Furthermore, in the sewage treatment system with the biological flocculation technology coupled with the aeration algae pond, the hydraulic retention time of the middle sedimentation tank is 1.5-4h, so that the separation of sludge and water is realized; 30-40% of sludge in the intermediate sedimentation tank enters a biological filter for activation, and the rest sludge and flocs enter a dehydration machine room.

Furthermore, in the sewage treatment system with the biological flocculation technology coupled with the aeration algae pond, the hydraulic retention time of the biological filter is 1-2h, wherein the sludge age of the sludge is 5-8 days.

Furthermore, in the sewage treatment system with the biological flocculation technology coupled with the aeration algae pond, the aeration algae pond adopts air aeration for oxygen supply, and the dissolved oxygen concentration is more than 2 mg/L.

Furthermore, in the sewage treatment system of the biological flocculation technology coupled aeration algae pond, the rapid filter pond comprises a pond body, a filter material layer, a water distribution system and a back washing drainage system.

Further, in the biological flocculation technology coupled aeration algae pond sewage treatment system, the flocculating agent put into the biological flocculation tank is flocculation bacteria inoculation particles, and the flocculation bacteria inoculation particles are formed by mixing biological bacteria supernatant and an adsorption carrier according to a mass ratio of 4: 6; the biological bacteria are prepared by mixing Klebsiella, Paenibacillus polymyxa, Alcaligenes faecalis, Rhodococcus ruber and Aspergillus niger according to the volume ratio of 3:1:3:2: 1.

Further, in the sewage treatment system of the biological flocculation technology coupled with the aeration algae pond, the adsorption carrier is made of at least one of diatomite, turfy soil and chitosan.

Furthermore, in the sewage treatment system of the biological flocculation technology coupled aeration algae pond, a plurality of groups of hooks are symmetrically fixed on the wall of the biological flocculation tank, each group of hooks is connected in series with a biological flocculation reinforcement carrier through a hanging wire, the biological flocculation reinforcement carrier is a grid bag filled with flocculation bacteria inoculation particles, and the grid bag is made by hot-pressing and cutting strip-shaped pipe bags.

Further, in the sewage treatment system of the biological flocculation technology coupled with the aeration algae pond, the strip-shaped pipe is made of polypropylene materials, and the aperture of the mesh of the strip-shaped pipe is 1/4-1/3 of the particle size of the flocculation bacteria inoculation particles.

The invention has the beneficial effects that:

the invention has reasonable structural design, firstly, suspended colloidal substances adsorbed and flocculated by suspended microorganisms in the sewage are precipitated in the intermediate sedimentation tank, thereby greatly reducing the easy blockage phenomenon of the subsequent oxidation treatment of the biological filter; secondly, a microbial inoculum carrier reinforcing system consisting of hooks, a hanging wire and a biological flocculation reinforcing carrier is arranged in the biological flocculation tank, so that the loss speed of flocculation bacteria inoculation particles can be greatly delayed, and the operation cost is reduced.

Of course, it is not necessary for any one product that embodies the invention to achieve all of the above advantages simultaneously.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings used in the description of the embodiments will be briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art that other drawings can be obtained according to the drawings without creative efforts.

FIG. 1 is a schematic view of the structure of a sewage treatment system according to the present invention;

FIG. 2 is a schematic diagram of the composition of a bioflocculation reaction tank according to the present invention;

FIG. 3 is a schematic diagram of the internal structure of the biological flocculation tank of the invention;

FIG. 4 is a schematic cross-sectional view of the bioflocculation enhancement carrier of the present invention;

in the drawings, the components represented by the respective reference numerals are listed below:

1-a grating pool, 2-a grit chamber, 3-a regulating pool, 4-a biological flocculation reaction pool, 401-a biological flocculation pool, 402-an intermediate sedimentation pool, 403-a biological filter pool, 5-an aerated algae pool, 6-a quick filter pool, 7-a disinfection pool, 8-a sampling port, 9-a dewatering machine room, 10-a hook, 11-a hanging line, 12-a biological flocculation reinforcing carrier and 13-flocculation bacteria inoculation particles.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

Example one

As shown in fig. 1-4, the present embodiment is a sewage treatment system of a bio-flocculation technology coupled aerated algae pond, which comprises a grid pond 1, a grit chamber 2, a regulating pond 3, a bio-flocculation reaction pond 4, an aerated algae pond 5, a rapid filtration pond 6, a disinfection pond 7, a sampling port 8 and a dewatering machine room 9. The biological flocculation reaction tank 4 is divided into three lattices, the first lattice is a biological flocculation tank 401, the second lattice is an intermediate sedimentation tank 402, the third lattice is a biological filter tank 403, and part of sludge entering the biological filter tank 403 in the intermediate sedimentation tank 402 flows back to the biological flocculation tank 401 after reacting, so that the concentration of the sludge in the biological flocculation tank 401 is kept unchanged. One end of the grid pond 1 is a domestic sewage inlet end, the other end of the grid pond is connected with a biological flocculation pond 401 in a biological flocculation reaction pond 4 through a grit chamber 2 and an adjusting pond 3 with hydrolysis and acidification functions, and a biological filter 403 of the biological flocculation reaction pond 4 is connected with a disinfection pond 7 through an aeration algae pond 5 and a quick filter 6. Be provided with in the grid pond 1 and be convenient for carry the check sediment elevator pump to the dehydration computer lab 9 in with the check sediment of interception, 2 bottoms in grit chamber are provided with and are convenient for carry the mud elevator pump to the dehydration computer lab 9 in with mud, and biological flocculation reaction tank 4 is located middle sedimentation tank 402 and is equipped with and is convenient for carry unnecessary mud and floc to the floc elevator pump in the dehydration computer lab, is equipped with the sampling mouth 8 that is convenient for detect the water sample in the drain pipe of disinfection pond 7.

In the embodiment, the sludge in the biological flocculation tank 401 is in a suspension state through mechanical stirring, and the concentration of the sludge is 3 g/L; the hydraulic retention time of the biological flocculation tank is 1.5 h. The hydraulic retention time of the intermediate sedimentation tank 402 is 2.2h, wherein 30-40% of sludge enters the biological filter for activation, and the rest sludge and flocs enter a dewatering machine room. The hydraulic retention time of the biological filter 403 is 1.5h, wherein the sludge age of the sludge is 5-8 days.

In the embodiment, the aeration algae pond 5 adopts air aeration oxygen supply, and the dissolved oxygen concentration is more than 2 mg/L. The rapid filter 6 comprises a tank body, a filter material layer, a water distribution system and a back flush drainage system.

In this embodiment, the flocculant is added in the biological flocculation tank 401 in an amount of 50g/m³The flocculant is added into the biological bacteria inoculation particles 13, and the flocculation bacteria inoculation particles 13 are formed by mixing the supernatant of the biological bacteria and the adsorption carrier according to the mass ratio of 4: 6; the biological bacteria are prepared by mixing Klebsiella, Paenibacillus polymyxa, Alcaligenes faecalis, Rhodococcus ruber and Aspergillus niger according to the volume ratio of 3:1:3:2: 1. The adsorption carrier is at least one of diatomite, turfy soil and chitosan.

In this embodiment, a plurality of groups of hooks 10 are symmetrically fixed on the wall of the biological flocculation tank 401, each group of hooks 10 is connected in series with a biological flocculation reinforcement carrier 12 through a hanging wire 11, and the biological flocculation reinforcement carrier 12 is a grid bag filled with flocculation bacteria inoculation particles 13. The grid bag is made by hot-pressing and cutting a strip-shaped tube bag, the strip-shaped tube is made of polypropylene materials, and the aperture of the mesh of the grid bag is 1/4-1/3 of the particle size of the flocculating bacteria inoculation particles. After the strip-shaped pipe is cut by hot-pressing air, the cut part is sealed by hot melting. The cutting speed is slow, so that the flocculation bacteria inoculation particles 13 at the cutting position are self-adaptively extruded to two sides, and the edge sealing can not be hindered.

One specific application of this embodiment is: rural domestic sewage is by the inlet channel at first get into grid pond 1, and wherein debris such as bulky suspended solid, foam, billet are mainly got rid of to thick grid, then get into thin grid well through one-level pump house, flow into the grit chamber certainly behind the insoluble suspended solid of interception aquatic, and a large amount of SS, TSS in aquatic sink in the bottom, and 2 bottoms in grit chamber set up the mud elevator pump to guarantee that follow-up process can unblocked operation. Meanwhile, aiming at rural domestic sewage containing kitchen water, soapy water and the like and more grease, an oil collecting pipe is arranged on a water outlet channel of the grit chamber 2, and oil in the domestic sewage is skimmed, so that the rural domestic sewage is pretreated.

After the sewage is settled, the sewage enters an adjusting tank 3 with hydrolysis and acidification functions for adjusting the chemical properties of the water body and degrading organic matters, 3 submersible sewage pumps are arranged, 1 device is used for 2 devices, and 1 jet aerator is arranged for aerating and stirring the sewage in the tank to prevent sludge deposition at the bottom of the adjusting tank 3 and anaerobic stink of the sewage. Considering that the content of the domestic sewage N, P is high, in order to ensure that the water body can reach the standard and follow the economic principle, the regulated water body enters the biological flocculation reaction tank 4 to be greatly reduced by N, P, and the generated floc is dehydrated. And the subsequent water body enters an aeration algae pond, the water body N, P is removed through the metabolism of the algae, and the growth of the algae is accelerated at the same time, so that the economic benefit is converted. The COD and the like of the treated water body still can not reach the discharge standard, and the water body needs to be subjected to advanced treatment by the rapid filter 6. And finally, the water enters a disinfection tank 7 for sterilization and disinfection, a chlorine dioxide generator is used for contact disinfection, and the water quality detected by a sampling port 8 can be discharged or recycled after reaching the standard.

Example two

In the embodiment, the sludge in the biological flocculation tank 401 is in a suspension state through mechanical stirring, and the concentration of the sludge is 1 g/L; the hydraulic retention time of the biological flocculation tank is 1 h. The hydraulic retention time of the intermediate sedimentation tank 402 is 1.5h, wherein 30-40% of sludge enters the biological filter for activation, and the rest sludge and flocs enter a dewatering machine room. The hydraulic retention time of the biological filter 403 is 1h, wherein the sludge age of the sludge is 5-8 days.

EXAMPLE III

In the embodiment, the sludge in the biological flocculation tank 401 is in a suspension state through mechanical stirring, and the concentration of the sludge is 5 g/L; the hydraulic retention time of the biological flocculation tank is 3 h. The hydraulic retention time of the intermediate sedimentation tank 402 is 4h, wherein 30-40% of sludge enters the biological filter for activation, and the rest sludge and flocs enter a dewatering machine room. The hydraulic retention time of the biological filter 403 is 2h, wherein the sludge age of the sludge is 5-8 days.

Example four

In this embodiment, the treatment process of the sludge and flocs in the dewatering machine room 9 is one of gravity concentration and natural drying, mechanical concentration and mechanical dewatering, and gravity concentration and mechanical dewatering. The dewatered mud cake can be used as a farmland or greening base fertilizer or mixed with weeds and the like for anaerobic composting for sludge transportation and final treatment, so that the economic benefit is improved.

EXAMPLE five

In the embodiment, the dominant algae species in the aeration algae pool 5 are Chlamydomonas, Scenedesmus, Chlorella, and the like, can be used as food for animals such as fish, shrimp, shellfish, and the like, and the inlet water quality is controlled to be 10-15mg/L of ammonia nitrogen concentration and 2-2.5mg/L of total phosphorus. The aeration algae pond 5 removes N, P through algae transformation, and the aeration machine adopts intermittent aeration, and dephosphorization effect is good, especially the aeration during the daytime soluble phosphorus decline fast.

The preferred embodiments of the invention disclosed above are intended to be illustrative only. The preferred embodiments are not intended to be exhaustive or to limit the invention to the precise embodiments disclosed. Obviously, many modifications and variations are possible in light of the above teaching. The embodiments were chosen and described in order to best explain the principles of the invention and the practical application, to thereby enable others skilled in the art to best utilize the invention. The invention is limited only by the claims and their full scope and equivalents.

Claims

1. A biological flocculation technology coupling aeration algae pond sewage treatment system is characterized in that: the sewage treatment system comprises a grid pool, a grit chamber, an adjusting pool, a biological flocculation reaction pool, an aeration algae pool, a fast filter pool, a disinfection pool, a sampling port and a dewatering machine room, wherein the biological flocculation reaction pool is divided into three grids, the first grid is a biological flocculation pool, the second grid is an intermediate sedimentation pool, the third grid is a biological filter pool, and part of sludge in the intermediate sedimentation pool enters the biological filter pool to react and then flows back to the biological flocculation pool; the one end in grid pond is domestic sewage and gets into the end, and the other end is connected through the grit chamber, the equalizing basin that has the hydrolysis acidification effect and the biological flocculation pond in the biological flocculation reaction pond, the biological filter of biological flocculation reaction pond is connected through aeration algae pond, fast filtering pond and disinfection pond, be provided with the check sediment elevator pump of being convenient for carry the check sediment of interception to the dehydration computer lab in the grid pond, grit bottom of the pool portion is provided with the mud elevator pump of being convenient for carry mud to the dehydration computer lab in, the biological flocculation reaction pond is located middle sedimentation tank and is equipped with the floc elevator pump of being convenient for carry unnecessary mud and floc to the dehydration computer lab in, be equipped with the sampling opening of being convenient for detect the water sample in the drain pipe of disinfection pond.

2. The bio-flocculation technology coupled aerated algae pond sewage treatment system of claim 1, wherein: the sludge in the biological flocculation tank is in a suspension state through mechanical stirring, and the concentration of the sludge is 1-5 g/L; the hydraulic retention time of the biological flocculation tank is 1-3 h.

3. The bio-flocculation technology coupled aerated algae pond sewage treatment system of claim 1, wherein: the hydraulic retention time of the middle sedimentation tank is 1.5-4h, wherein 30-40% of sludge enters the biological filter for activation, and the rest sludge and floc enter a dehydration machine room.

4. The bio-flocculation technology coupled aerated algae pond sewage treatment system of claim 1, wherein: the hydraulic retention time of the biological filter is 1-2h, wherein the sludge age of the sludge is 5-8 days.

5. The bio-flocculation technology coupled aerated algae pond sewage treatment system of claim 1, wherein: the aeration algae pond adopts air aeration oxygen supply, and the dissolved oxygen concentration is more than 2 mg/L.

6. The bio-flocculation technology coupled aerated algae pond sewage treatment system of claim 1, wherein: the rapid filter tank comprises a tank body, a filter material layer, a water distribution system and a backwashing drainage system.

7. The bio-flocculation technology coupled aerated algae pond sewage treatment system of claim 1, wherein: flocculating agent thrown into the biological flocculation tank is flocculating bacteria inoculation particles, and the flocculating bacteria inoculation particles are formed by mixing biological bacteria supernatant and an adsorption carrier according to the mass ratio of 4: 6; the biological bacteria are prepared by mixing Klebsiella, Paenibacillus polymyxa, Alcaligenes faecalis, Rhodococcus ruber and Aspergillus niger according to the volume ratio of 3:1:3:2: 1.

8. The bio-flocculation technology coupled aerated algae pond sewage treatment system of claim 7, wherein: the adsorption carrier is made of at least one of diatomite, turfy soil and chitosan.

9. The bio-flocculation technology coupled aerated algae pond sewage treatment system of claim 7, wherein: the biological flocculation tank is characterized in that a plurality of groups of hooks are symmetrically fixed on the tank wall of the biological flocculation tank, each group of hooks is connected with a biological flocculation reinforcing carrier in series through a hanging wire, the biological flocculation reinforcing carrier is a grid bag filled with flocculation bacteria inoculation particles, and the grid bag is formed by cutting strip-shaped pipe bags through hot pressing.

10. The bio-flocculation technique coupled aerated algal pond wastewater treatment system of claim 9, wherein: the strip-shaped pipe is made of polypropylene material, and the aperture of the mesh of the strip-shaped pipe is 1/4-1/3 of the particle size of the flocculation bacteria inoculation particles.