CN205347124U - City river drain sewage treatment device - Google Patents

Abstract

The utility model relates to sewage treatment equipment for urban river sewage outlets, comprising a primary treatment unit and a secondary treatment unit connected in series. The primary treatment unit includes a regulating tank, a pipeline mixer, a folded plate flocculation reaction tank, and an inclined plate sedimentation tank connected in sequence, and the secondary treatment unit includes a denitrification filter, a nitrification aeration filter and a clear water filter connected in sequence. pool. After the secondary treatment unit, a tertiary treatment unit can be installed to further filter the sewage. The utility model fully considers the terrain characteristics of the sewage outlet of the river, the sewage treatment equipment has strong processing capacity, the overall impact load resistance performance of the equipment is excellent, and can adapt to the characteristics of the steep rise and fall of the water volume of the sewage outlet of the river. It can be set on the ground and can also be half buried or fully buried, especially suitable for use on both sides of narrow and long urban rivers.

Description

Sewage treatment equipment for urban river sewage outlets

technical field

The utility model relates to sewage treatment equipment for urban river channel sewage outlets, which is mainly suitable for sewage treatment at river channel sewage outlets for discharging domestic sewage and other similar sewage.

Background technique

The sewage treatment method at urban river mouths is largely a solid-liquid separation technology. The existing sewage treatment methods generally use aerated grit chambers (the most common mixed reaction tanks) and primary sedimentation tanks to remove Suspended and colloidal substances, and then the sewage undergoes various purification functions such as physical and biological metabolism, so as to meet the requirements of sewage discharge.

But there are many weak points in existing sewage treatment method:

First of all, commonly used mixing reaction tanks, primary sedimentation tanks and other water treatment units have long residence time, low hydraulic load, high initial construction investment, and large floor area. In addition, while removing suspended solids, the concentration of organic matter in sewage often also decreases. When the treatment of suspended solids in sewage is too high, the removal of COD _cr is too high, resulting in a carbon source for nitrate nitrogen in the subsequent denitrification process. Reduced, denitrification is inhibited, which requires additional carbon sources and increases equipment costs; if the treatment of suspended solids is too low, it will cause the subsequent denitrification biological filter to block too quickly or require frequent backwashing.

Secondly, the post-denitrification process is generally adopted in the biological aerated filter. The management of the post-denitrification is complicated and the operation cost is high. The influent water needs to be pretreated, otherwise a large amount of impurities and SS in the raw water will enter the aeration filter, which will block the aeration and water distribution system, and bring serious consequences to the operation of the system. In the process of denitrification, an additional carbon source is required for denitrification. In order to ensure the denitrification effect, an excessive amount of carbon source is generally required. Therefore, the total nitrogen in the effluent of the denitrification tank will reach the standard and the organic matter will exceed the standard. After the denitrification filter, it will generally increase. Carbon removal equipment increases equipment costs.

Contents of the invention

In order to solve the problems existing in the prior art, the purpose of this utility model is to provide a kind of sewage treatment equipment for urban river sewage outfalls. Through the reasonable improvement of the prior art, the equipment as a whole can achieve small volume, low floor space, low investment and easy treatment. It has the advantages of high efficiency, simple process, convenient operation and management, etc. The overall equipment adopts a serial form, and the layout is flexible. It can be installed on the ground or half-buried or fully buried. It is especially suitable for use on both sides of narrow and long urban rivers.

The technical scheme of the utility model is:

A kind of sewage treatment equipment for sewage outfalls of urban rivers, including a primary treatment unit, a secondary treatment unit and a tertiary treatment unit connected in series, the primary treatment unit includes a regulating tank, a pipeline mixer, and a folding plate flocculation reaction connected in sequence pool and inclined plate sedimentation tank, the secondary treatment unit includes denitrification filter, nitrification aeration filter and clear water tank connected in sequence, and the tertiary treatment unit is equipped with filtering equipment. The urban river sewage outfall is connected to the adjustment pool, and the sewage is discharged from the third-level treatment unit after being treated by the equipment of the first-level treatment unit, the second-level treatment unit and the third-level treatment unit.

Preferably, a fine grill is provided at the water inlet of the regulating pool.

Preferably, a dosing device for adding flocculant to the sewage is provided between the regulating tank and the pipeline mixer.

Preferably, the pipeline mixer is composed of a pipeline-shaped casing and multi-section fixed blades arranged in the pipeline-shaped casing.

Preferably, the folded plate flocculation reaction tank includes a flocculation tank body, and several sets of opposite folded plates are arranged in the flocculation tank body, and the two sides of the folded plates are respectively fixedly connected with two opposite inner walls of the flocculation tank body.

Preferably, the sloping plate sedimentation tank includes a sedimentation tank body, the middle part of the sedimentation tank body is a baffle sloping plate area provided with a sloping plate device, the bottom of the sedimentation tank body is a mud bucket, and the baffle slant A space for forming a clear water area is reserved above the plate area, and a space for forming a water distribution area is reserved under the baffle plate area and between the mud buckets. The water inlet connected to the nozzle, the said sloping plate device is composed of two sets of opposite upper sloping plates and lower sloping plates, the said upper sloping plate is provided with a lower hem, the said lower slanting plate is provided with an upper hem, the said The lower folded edge of the upper inclined plate and the upper folded edge of the lower folded plate intersect each other.

Preferably, the sludge discharge pipeline of the mud hopper at the bottom of the inclined plate sedimentation tank is connected to the sludge storage tank, and the sludge discharge pipeline of the sludge storage tank is connected to the sludge activation tank, and the sludge activation tank is provided with supporting aeration device, the sludge outlet of the sludge activation tank is connected to the folded plate flocculation reaction tank through a sludge return pipe.

Preferably, a nitrification liquid return pipeline is provided between the outlet water of the nitrification aeration filter and the inflow of the denitrification filter, and a return pump and a flow meter are arranged on the nitrification liquid return pipeline, and the nitrification liquid return pipeline The water inlet end of the nitrification aeration filter is connected to the water outlet area of the nitrification aeration filter, the water outlet pipe of the nitrification aeration filter or the clear water pool, and the water outlet end of the nitrification liquid return pipe is connected to the denitrification filter or denitrification filter The pool's water inlet pipe.

Preferably, a backwash water pump is also provided, and the backwash water pump is arranged on the backwash water inlet pipeline between the clear water tank, the denitrification filter and the nitrification aeration filter, and the backwash water pump is used for Backwashing water is provided to the denitrification filter and the nitrification aeration filter, and the backwash outlet pipes of the denitrification filter and the nitrification aeration filter are connected to the regulating tank.

Preferably, a disinfection pool is also provided in front of or behind the filtering equipment.

The beneficial effects of the utility model are:

The utility model rationally combines and improves the technology of the traditional primary treatment unit (chemically strengthened primary treatment) and secondary treatment unit (biological aerated filter), so that the overall equipment achieves small volume, low floor space, Low investment, high processing efficiency, simple process flow, convenient operation and management, etc. Moreover, the overall impact load resistance performance of the equipment is excellent, and it can adapt to the characteristics of the steep rise and fall of the water volume of the sewage outlet of the river. The overall equipment adopts the form of series connection, and the layout is flexible. on both sides of the urban river.

The primary treatment unit can remove a large amount of organic pollutants and suspended particles in the sewage to reduce the biological load of the subsequent process, thereby reducing the oxygen consumption of the overall process and the output of excess sludge;

The SS removal rate in sewage can reach more than 90%, and the treated sewage fully meets the requirements of the secondary treatment unit for SS content, which greatly prolongs the time interval of backwashing, reduces the number of backwashing times and operating costs; at the same time, the primary The treatment unit reduces the concentration of organic pollutants in the sewage, thereby reducing the load of the secondary treatment unit, reducing aeration and reducing operating costs; the primary treatment unit reasonably controls the carbon source entering the secondary treatment unit The quantity can control the number of heterotrophic bacteria and create more conditions for the growth of nitrifying bacteria with nitrogen removal effect, thus improving the effect of nitrogen removal.

The secondary treatment unit adopts the biological aerated filter process, and the denitrification filter is pre-installed according to the denitrification needs. The pre-denitrification can avoid the disadvantage that the synchronous denitrification degree of the biological aerated filter system itself is not enough to meet the requirements of total nitrogen discharge. . The A/O method is combined with the biological filter, and the denitrification and nitrification reactions are carried out in two series-connected reaction units. The nitrification aeration filter returns the nitrification liquid to provide nitrate nitrogen (NO ₃ -N) for the denitrification filter. ); at the same time, the use of the pre-denitrification filter can also save the carbon removal equipment after the traditional denitrification filter.

The utility model is also equipped with equipment for reflux activated sludge, which can reduce the sludge output and flocculant dosage, and at the same time introduce the backwash sludge of the secondary treatment unit into the regulating tank, further reducing the sludge output of the whole system.

The utility model fully considers the amount of sewage to be treated at the sewage outlets of urban rivers. The three-stage treatment unit adopts a single-valve filter or a valveless filter, which has low operating costs and is easy to automatically control. The backwashing intensity can be manually set, and the service life of the filter material long.

Description of drawings

Fig. 1 is a schematic diagram of the utility model;

Fig. 2 is the schematic diagram of the first-level processing unit of the utility model;

Fig. 3 is the schematic diagram of the secondary processing unit of the present utility model;

Fig. 4 is the schematic diagram of the three-level processing unit of the utility model;

Fig. 5 is the structural diagram of CEPT equipment of the present utility model;

Fig. 6 is a schematic structural diagram of the folding plate flocculation reaction tank of the present invention;

Fig. 7 is a schematic diagram of the upper folded plate structure of the folded plate flocculation reaction tank of the present invention;

Fig. 8 is a schematic diagram of the lower folded plate structure of the folded plate flocculation reaction tank of the present invention;

Fig. 9 is a schematic structural diagram of the inclined plate sedimentation tank of the present invention;

Fig. 10 is a schematic diagram of the structure of the inclined plate in the baffle area of the utility model.

detailed description

Below in conjunction with accompanying drawing, the utility model is further described.

Referring to Fig. 1 to Fig. 10, the utility model discloses a kind of sewage treatment equipment at the sewage outlet of urban river, which includes a first-level treatment unit, a second-level treatment unit and a third-level treatment unit connected in series, and the sewage from the sewage outlet of the urban river flows into the unit sequentially. The first-level treatment unit, the second-level treatment unit and the third-level treatment unit are processed, and the first-level treatment unit includes the regulating tank and CEPT equipment connected in sequence (including pipeline mixer 1, folded plate flocculation reaction tank 3 and inclined plate sedimentation pool 4), the secondary treatment unit includes a denitrification filter (DN pool), a nitrification aeration filter (CN pool) and a clean water pool connected in sequence, and the tertiary treatment unit is provided with filtering equipment. The utility model adopts the series operation of the first-level treatment unit, the second-level treatment unit and the third-level treatment unit. The first-level treatment unit creates good conditions for the stable operation of the second-level treatment unit. The overall working efficiency of the equipment, the overall equipment has the advantages of small size, small footprint, low investment, high processing efficiency, simple process flow, and convenient operation and management.

The regulating tank is provided with a fine grid, which can intercept larger suspended matter and floating matter in the sewage, and reduce the subsequent treatment pressure.

A dosing device for adding a flocculant to the sewage is provided between the adjustment tank and the pipeline mixer, and the flocculant is preferably an organic flocculant.

The pipeline mixer is composed of a pipeline and multi-section fixed blades arranged in the pipeline, which can split the water flow in pairs, and simultaneously generate vortex reverse rotation and cross flow, so that the flocculant and sewage can obtain a better mixing effect.

Figure 6 shows the folded plate flocculation reaction tank of the present invention, the folded plate flocculation reaction tank is composed of a pool body 10 and a mud storage area 12 at the bottom of the pool body, and several groups of relative folded plates are arranged in the pool body, The folded plates are divided into an upper folded plate 7 and a lower folded plate 8, and two adjacent folded plates are respectively fixed on two opposite inner walls of the pool body. Figures 7 to 8 show the upper and lower folded plates of the present invention. The angle between adjacent segments on the folded plates is 90 degrees, and sewage circulation channels are formed between the folded plates, which can increase the efficiency of sewage flocculation reaction. To ensure that the water flow reaches the turbulent state required for flocculation, so that the energy loss can be fully utilized and the residence time shortened. The sewage flows into the tank through the pipeline mixer 1 and the water inlet pipe 2. Under the action of the water flow, the micro flocs in the sewage contact and collide with each other to form larger flocs. After the flocculation reaction, the large flocs sink to the bottom of the pool. Then it is discharged into the mud hopper by the mud discharge pipe 11, and the treated sewage flows out from the water outlet 9.

Fig. 9 shows the inclined plate settling tank of the present utility model, and described inclined plate settling tank is made up of clear water area 14, baffle inclined plate area 15, water distribution area 16 and mud bucket 17 from top to bottom, and the upper part of described clear water area A water outlet weir 5 is provided, and the water inlet 19 of the water distribution area is connected with the water outlet of the folded plate flocculation reaction tank, and clear water flows into the water distribution area through the water inlet, and the mud bucket is located at the bottom of the inclined plate sedimentation tank, The sludge in the mud bucket flows into the sludge storage tank through the sludge discharge pipe 18. Figure 10 shows the slant plate 20 in the baffle slant plate area of the present invention. The baffle slant plate area is composed of two groups of opposite slant plates, and the two groups of slant plates are arranged in a staggered interval, and each group of slant plates It includes several parallel boards, and the distance between adjacent inclined boards is equal and adjustable. The inclined plate sedimentation tank has the advantages of high sedimentation efficiency, small tank volume, and less floor space. The sewage enters the water distribution area and passes through the baffled inclined plate area from bottom to top. Falling into the mud bucket, the clear water enters the clear water area through the baffle sloping plate area, and the overflow enters the next processing unit through the outlet pipe 6.

There is also a sludge discharge pipeline connected to the inclined plate sedimentation tank connected to the sludge storage tank, the sludge discharge pipeline of the sludge storage tank is connected to the sludge activation tank, and the sludge activation tank is provided with a supporting aeration device, The sludge outlet of the sludge activation tank is connected to the flap flocculation reaction tank. The sludge storage tank can collect the sludge produced by the reaction in the inclined plate sedimentation tank, and a part of the sludge can be used for secondary use such as compost after being discharged; The tank body of the plate flocculation reaction tank is used as a biological flocculant, which can reduce the amount of equipment flocculant input.

A return pump and a flow meter are also provided, and the return pump and flow meter are arranged on the return pipeline between the nitrification aeration filter and the denitrification filter, and the return pump and flow meter are used to provide The digestate is refluxed in the nitrification filter.

A backwash water pump is also provided, and the backwash water pump is arranged on the backwash pipeline between the clear water tank, the denitrification filter and the nitrification aeration filter, and the backwash water pump is used to provide The nitrification filter and the nitrification aeration filter provide backwash water, and the backwash outlet pipes of the denitrification filter and the nitrification aeration filter are connected to the regulating tank.

The outlet pipe of the clean water pool is connected to a river course or a tertiary treatment unit, and the tertiary treatment unit is a filter device, and the filter device preferably adopts a single-valve filter or a valveless filter.

According to actual needs, disinfection facilities may or may not be provided. When disinfection facilities are provided, the disinfection facilities may adopt any suitable method, for example, it may be a disinfection tank that adopts liquid chlorine disinfection, or it may be able to Ozone disinfection equipment for sterilizing the water in the water, etc., the disinfection facilities can be set in front of the filter equipment, and can also be set behind the filter equipment.

The working process of the utility model is as follows: the domestic sewage is discharged into the regulating pool from the sewage outlet of the urban river for regulation, and the large suspended matter and floating matter in the sewage are intercepted by setting a fine grid, and the regulating pond can regulate the water output of the sewage, so that The water output is stable. The sewage regulated by the regulating tank enters the water inlet pipe, and the sewage flows into the pipeline mixer. At the same time, the dosing device adds the flocculant into the pipeline mixer for full mixing, and the mixed liquid flows into the flap flocculation reaction tank. The sewage passes through the sewage circulation channel surrounded by the folded plates in the turbulent state, and the micro flocs in the sewage contact and collide with each other to form larger flocs, and the treated sewage flows into the water distribution area in the inclined plate sedimentation tank. As the water level of the sewage rises, the sewage enters the baffle plate area for further treatment. The flocculated particles in the sewage settle on the slant plate and fall into the mud bucket under the action of gravity. The clean water enters the clean water area through the baffle plate area and passes through the outlet water. The weir flows into the next processing unit.

The sewage treated by the primary treatment unit flows into the denitrification filter for denitrification, and then enters the nitrification aeration filter with a packing layer to realize the process of nitrification and carbon removal of sewage. Part of the effluent from the nitrification aeration filter flows back to the denitrification filter to provide NO ₃ -N for the denitrification of the denitrification filter, and the other part flows into the clear water tank and overflows into the river or enters the tertiary treatment unit. The utility model is also equipped with a backwash water pump. When the denitrification filter and the nitrification aeration filter need to be flushed, the water inlet of the primary treatment unit can be closed, the backwash water pump can be turned on for flushing, and the sewage after flushing is returned to the primary treatment. unit.

The tertiary treatment unit further filters the sewage, and the filtered sewage is directly discharged into the river or after being disinfected.

The sewage treatment equipment of the utility model has a strong treatment capacity, and the water quality of the urban river sewage outlet sewage treated by the primary treatment unit and the secondary treatment unit can reach the national standard "Pollutant Discharge Standards for Urban Sewage Treatment Plants" (GB18918-2002) The specified first-level B discharge standard; after being filtered by the third-level treatment unit, the effluent water quality can reach the B discharge limit specified in the Beijing local standard "Integrated Water Pollutant Discharge Standard" (DB11/307-2013) (village domestic sewage treatment station ). The utility model fully considers the terrain characteristics of the river sewage outlet, the overall equipment has excellent impact load resistance performance, and can adapt to the characteristics of the steep rise and fall of the water volume of the river sewage outlet. Buried or fully buried, it is especially suitable for use on both sides of narrow and long urban rivers.

Claims (10)

1. A kind of urban river sewage outfall sewage treatment equipment, it is characterized in that comprising the primary processing unit, secondary processing unit and tertiary processing unit connected in series, described primary processing unit comprises regulating pond, pipeline mixer connected successively 1. Folded plate flocculation reaction tank and inclined plate sedimentation tank, the secondary treatment unit includes denitrification filter, nitrification aeration filter and clean water tank connected in sequence, and the tertiary treatment unit is provided with filtering equipment. 2. The sewage treatment equipment of urban river sewage outfall as claimed in claim 1, characterized in that a fine grid is arranged at the water inlet of the regulating tank. 3. The sewage treatment equipment of urban river sewage outfall as claimed in claim 2, characterized in that a dosing device for adding flocculant to the sewage is provided between the regulating tank and the pipeline mixer. 4. The sewage treatment equipment of urban river sewage outfall as claimed in claim 3, characterized in that the pipeline mixer is composed of a pipeline-shaped casing and multi-section fixed blades arranged in the pipeline-shaped casing. 5. The sewage treatment equipment of urban river sewage outfall as claimed in claim 4, characterized in that said folded plate flocculation reaction tank comprises a flocculation tank body, said flocculation tank body is provided with several sets of relative folded plates, said folded plates The two sides of each are fixedly connected with two opposite inner walls in the body of the flocculation tank. 6. The sewage treatment equipment of urban river sewage outfall as claimed in claim 5, wherein the inclined plate sedimentation tank comprises a sedimentation tank body, and the middle part of the sedimentation tank body is a baffle plate area provided with a sloping plate device , the bottom of the sedimentation tank body is a mud hopper, a space for forming a clear water area is left above the baffle sloping plate area, and a space for forming a water distribution area is left between the bottom of the baffle sloping plate area and the mud hopper , the water distribution area is provided with a water inlet connected to the water outlet of the folded plate flocculation reaction tank, and the inclined plate device is composed of two sets of opposite upper inclined plates and lower inclined plates, and the upper inclined plate is provided with As for the lower flap, the lower inclined plate is provided with an upper flap, and the lower flap of the upper inclined plate and the upper flap of the lower flap intersect each other. 7. The urban river sewage outlet sewage treatment equipment as claimed in claim 6, characterized in that the mud discharge pipeline of the mud bucket at the bottom of the inclined plate sedimentation tank is connected to the mud storage tank, and the mud discharge pipeline of the mud storage tank is connected to A sludge activation tank, the sludge activation tank is provided with a matching aeration device, and the sludge outlet of the sludge activation tank is connected to the folded plate flocculation reaction tank through a sludge return pipe. 8. The urban river sewage outfall sewage treatment equipment as claimed in claim 1, characterized in that a nitrification liquid return pipeline is arranged between the outlet water of the nitrification aeration filter and the inflow of the denitrification filter, and the nitrification liquid The return pipeline is provided with a return pump and a flow meter, and the water inlet end of the nitrification liquid return pipeline is connected to the water outlet area of the nitrification aeration filter, the water outlet pipeline or the clear water pool of the nitrification aeration filter, and the nitrification The outlet end of the liquid return pipe is connected to the denitrification filter or the water inlet pipe of the denitrification filter. 9. The urban river sewage outfall sewage treatment equipment as claimed in claim 1, characterized in that a backwash water pump is also provided, and the backwash water pump is arranged between the clean water pool and the denitrification filter tank and nitrification aeration filter. The backwash water inlet pipe between the pools, the backwash water outlet pipes of the denitrification filter tank and the nitrification aeration filter tank are connected to the regulating tank. 10. The urban river sewage outlet sewage treatment equipment as claimed in any one of claims 1-9, characterized in that disinfection facilities are provided or not, and when disinfection facilities are provided, the disinfection facilities are arranged on the filter equipment in front or behind.