CN216073230U

CN216073230U - A/O combined system for handling rural sewage

Info

Publication number: CN216073230U
Application number: CN202122206860.9U
Authority: CN
Inventors: 黄占峰; 胡新华; 顾良波
Original assignee: Shanxi University
Current assignee: Shanxi University
Priority date: 2021-09-13
Filing date: 2021-09-13
Publication date: 2022-03-18
Anticipated expiration: 2031-09-13

Abstract

An A/O combined system for treating rural sewage belongs to the field of sewage treatment and aims to solve the common problem of treatment of domestic sewage in rural areas in the north. The system is formed by connecting a low-oxygen circulating flow synchronous nitrification and denitrification process and a biofilm process in series, and solves the problem of unstable sewage source through the adjustment of working conditions such as a built-in adjustable diversion folded plate, a diversion wall, a flow pusher, a variable frequency air pump and the like of a LOCF-SND process system of the first-level A/O; the carbon source utilization rate is improved through low-oxygen operation, diversion wall adjustment, A-O space transition, area distribution and the like, and the problem of high ash-water ratio is solved; the biological combined filler or the MBBR filler is arranged in the two-stage A/O biomembrane process system, so that the overall tank volume is reduced, the sewage treatment effect is improved, and the problems of low temperature and high drainage standard in winter are solved; the sludge is refluxed by an air stripping device and the like, and the system operation part has the advantages of flexible and simple control, low operation failure rate, low commissioning cost and the like.

Description

A/O combined system for handling rural sewage

Technical Field

The utility model belongs to the technical field of sewage treatment, and particularly relates to a completely mixed active sludge process and biofilm process combined A/O system for treating rural domestic sewage.

Background

In recent years, rural sewage treatment becomes a new sail in the field of water service.

However, rural domestic sewage is limited by regional population, economic development, geographical climate and the like, the normal operation and maintenance of treatment equipment and facilities have great problems, and for northern rural areas, the system has the problems of low water temperature in winter, difficult collection of a sewage pipe network, unstable sewage source and the like.

Therefore, the developed process system suitable for treating domestic sewage in rural areas in the northern China is simple and convenient to operate and maintain, strong in impact load resistance, good in treatment effect, low in construction and operation cost and wide in application prospect.

Disclosure of Invention

The utility model aims to solve the problems of low temperature in winter, unstable sewage source, high gray water ratio, strict emission standard requirement and the like of rural domestic sewage in northern China, and provides an A/O combined system for treating rural sewage, which is formed by serially combining a low-oxygen circulating flow synchronous nitrification-denitrification (LOCF-SND for short, the same below) system and a biomembrane process system.

The utility model adopts the following technical scheme:

an A/O combined system for treating rural sewage comprises a first-stage A/O system for a low-oxygen circulating flow synchronous nitrification and denitrification process and a second-stage A/O system for a biofilm process, wherein the first-stage A/O system and the second-stage A/O system are connected in series for operation, and two-stage communication is realized through a perforated wall between the first-stage A/O system and the second-stage A/O system; the primary A/O system comprises a primary anoxic reaction tank and a primary aerobic reaction tank, and the primary aerobic reaction tank is nested in the primary anoxic reaction tank to realize internal circulation of sludge-water mixed liquor; the second-stage A/O system comprises a second-stage anoxic reaction tank and a second-stage aerobic reaction tank which are arranged in series, and a guide wall which is arranged longitudinally is arranged between the two tanks. The first-level A/O system is internally provided with an adjustable diversion folded plate, a flow pusher and an area semi-arc diversion wall; wherein, the semi-arc guide wall comprises a regional semi-arc guide wall I and a regional semi-arc guide wall II which are symmetrically arranged on the side walls of the two sides of the primary aerobic reaction tank, and biological combined filler or MBBR filler is arranged in the secondary A/O system. Aeration systems are arranged in the first-stage aerobic reaction tank and the second-stage aerobic reaction tank, and an external frequency-adjustable air pump provides an air source. The system adopts the branch point to intake, and the lateral wall in one-level oxygen deficiency reaction pond and second grade oxygen deficiency reaction pond is equipped with the water inlet respectively, and the pipe connection of water inlet is in same water intake pipe, and water intake pipe gets into one-level oxygen deficiency reaction pond and second grade oxygen deficiency reaction pond respectively, and the delivery port setting is at second grade aerobic reaction pond end. The secondary aerobic end is provided with an air lifting device, an independently configured frequency-adjustable air pump provides an air source, an outlet pipeline of the air lifting device extends to the water inlet turbulent flow region of the primary anoxic reaction tank, and mixed liquid is refluxed.

Furthermore, the adjustable diversion folded plate is positioned at the water inlet opening of the primary anoxic reaction tank and positioned on one side of the primary anoxic reaction tank close to the water inlet, and the whole body is obliquely inclined to the water inlet flow direction.

Furthermore, the adjustable diversion folded plate is axially fixed by a vertical shaft, the top of the shaft is provided with a steering travel switch, and the bottom of the rotating surface is provided with a sliding track with balls embedded at the bottom of the reaction tank for adjusting the folding angle.

Furthermore, the regional semi-arc guide wall is composed of a plurality of semi-arc retaining walls, is positioned on the side walls of two sides of the first-stage aerobic reaction tank, is symmetrically arranged, and arranges the retaining wall gaps and positions according to the flow rate and the flow state of the circulating mixed liquid.

Furthermore, the upper end and the lower end of the single semi-arc-shaped retaining wall are provided with fixing shafts, the fixing shafts are vertically arranged in a staggered mode, and the semi-arc angle is adjusted through tensioning and loosening.

Furthermore, the first-stage anoxic reaction tank is internally provided with three flow impellers which are respectively positioned at three top corners of the first-stage anoxic reaction tank.

Furthermore, the primary aerobic reaction tank and the secondary aerobic reaction tank are provided with aeration systems, a plurality of zone modules are divided, each zone is provided with an independent air supply branch pipe, each branch pipe is provided with an opening-adjustable electromagnetic valve, and the aeration quantity of the zones is independently regulated and controlled.

Furthermore, a dissolved oxygen detector and a dissolved oxygen control module are arranged in the aerobic reaction tank. The output end of the dissolved oxygen detector is connected with the input end of the dissolved oxygen control module, the output end of the dissolved oxygen control module is connected with the input end of the electromagnetic valve, and the air supply quantity of the regional module is regulated and controlled.

Further, the gas stripping device comprises a frequency modulation air pump, and the reflux quantity of the mixed liquid is adjusted in a variable mode.

The utility model has the following beneficial effects:

the utility model has the advantages of less carbon source demand, low sludge yield, high denitrification efficiency, strong impact load resistance, simple and convenient operation and maintenance and the like, and is particularly suitable for being used in rural areas in the north, which have unstable sewage source, high gray water ratio and low temperature in winter and are discharged to sensitive areas.

Drawings

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

FIG. 2 is a schematic view of the connection of the adjustable deflector of the present invention;

FIG. 3 is a schematic connection diagram of the regional semi-arc guide wall of the present invention;

wherein: 1-first-stage anoxic reaction tank; 2-a first-stage aerobic reaction tank; 3-a second-stage anoxic reaction tank; 4-a secondary aerobic reaction tank; 5-a gas stripping device; 6-a flow impeller; 7-adjustable diversion folded plates; 8-area semi-arc guide wall I; 9-area semi-arc guide wall II; 10-a perforated wall; 11-a filler; 12-a water inlet pipeline; 13-water outlet pipe; 14-semi-arc retaining wall; 15-fixed axis.

Detailed Description

The utility model is further explained with reference to the accompanying drawings.

As shown in the figure, the system is a two-stage A/O process system formed by combining a low-oxygen circulating flow synchronous nitrification and denitrification process and a biofilm process in series, wherein the first-stage A/O process system is a LOCF-SND process system, and a biofilm process with built-in biological combined filler or MBBR biofilm filler is adopted in a reaction tank of the two-stage A/O process system.

And (3) refluxing (circulating) nitration liquid and synchronous nitration and denitrification in the primary A/O process system.

The technological process and operation control of the utility model are realized as follows:

1. by means of internal equipment and facilities of the LOCF-SND process of the first-level A/O, sewage is in a low-oxygen circulating mixed flow state in the first-level A/O system, and synchronous nitrification and denitrification of the system are realized, which are as follows:

the system water inlet is blocked by a built-in adjustable diversion folded plate, the tangential flow enters a primary anoxic reaction tank, is rapidly mixed with the original slurry-water mixed liquor in the primary anoxic reaction tank and the return mixed liquor of a secondary A/O system, is drained by a flow impeller, enters a primary aerobic reaction tank through a semi-arc diversion wall in one side, is aerated and oxygenated, and is subjected to carbon source pollutant degradation and nitrogen source pollutant nitration; aerobic effluent entrained nitrification liquid flows out through a semi-arc-shaped guide wall in the area at the other side, and is mixed with sludge water in a first-stage anoxic reaction tank in the anoxic zone by means of a flow impeller; the effluent of the system is separated and shunted by the diversion folded plate, a small part of the effluent flows to the secondary A/O system through the perforated wall, and a large part of the effluent is mixed with the inlet water through the gallery between the diversion folded plate and the semi-arc diversion wall to carry out denitrification reaction in the traditional sense and degrade the pollutants of the carbon source and the nitrogen source of the system.

In the LOCF-SND process, dissolved oxygen is monitored by a dissolved oxygen detector arranged in the system during operation, and a detection signal of the dissolved oxygen detector is fed back to an electromagnetic valve of a branch pipeline of each aeration area of an O pool of the primary A/O system by a dissolved oxygen control module through a logic control program to regulate and control the low-oxygen operation of the system; and by means of the internal circulation flow state of the system, multiple cycles are carried out, the alternate operation of the anoxic zone and the aerobic zone is realized in the process, a regional microenvironment is created, the generation of synchronous nitrification and denitrification reactions is promoted, and the utilization rate of carbon sources and the degradation efficiency of nitrogen source pollutants are improved. In addition, the folding angle of the diversion folded plate can be adjusted through a sliding track arranged at the bottom of the reaction tank and a top turning travel switch, so that the water yield of the system is controlled, and further the circulation frequency of sewage in the system is controlled, so that the system is suitable for incoming water load change and working condition adjustment. Similarly, the angle of the semi-arc-shaped guide wall can be adjusted through the fixing shafts at the upper end and the lower end of the guide wall, and the operation adjustment under the working condition is assisted.

2. By means of biological combined filler or MBBR filler arranged in a secondary A/O process system, the whole tank volume is reduced, the sewage treatment effect is improved, and the effluent water is guaranteed to reach the standard, which is as follows:

the effluent of the primary A/O process system enters an anoxic reaction tank of the secondary A/O process system, is mixed with the point-by-point influent of the anoxic reaction tank of the secondary A/O process system, provides a carbon source by the point-by-point influent, and carries out the traditional denitrification reaction by virtue of biological combined filler or MBBR filler in the tank to further degrade carbon source and nitrogen source pollutants; then flows through a biological combined filler or an MBBR filler arranged in an aerobic reaction tank of the secondary A/O process system, and is aerated and oxygenated for degrading carbon source pollutants and nitrifying nitrogen source pollutants. The tail end of the secondary aerobic reaction tank is provided with an air stripping device for extracting reflux mixed liquor to reflux to the water inlet area of the anoxic reaction tank of the primary A/O process system so as to improve the total nitrogen removal efficiency.

The gas stripping device is provided with a gas source by a separately configured frequency-adjustable air pump, and the gas flow can be controlled by adjusting the frequency of the air pump, so that the reflux quantity of the mixed liquid is adjusted.

Claims

1. A/O combined system for treating rural sewage is characterized in that: the device comprises a first-stage A/O system used for a low-oxygen circulating flow synchronous nitrification and denitrification process and a second-stage A/O system used for a biofilm process, wherein the first-stage A/O system and the second-stage A/O system are connected in series, a perforated wall (10) is arranged between the first-stage A/O system and the second-stage A/O system, the first-stage A/O system comprises a first-stage anoxic reaction tank (1) and a first-stage aerobic reaction tank (2), the first-stage aerobic reaction tank (2) is nested in the first-stage anoxic reaction tank (1), the second-stage A/O system comprises a second-stage anoxic reaction tank (3) and a second-stage aerobic reaction tank (4) which are arranged in series, a flow guide wall is arranged between the second-stage anoxic reaction tank (3) and the second-stage aerobic reaction tank (4), and a gap is reserved between the free end of the flow guide wall and the side walls of the second-stage anoxic reaction tank (3) and the second-stage aerobic reaction tank (4), the lateral wall of one-level oxygen deficiency reaction tank (1) and second grade oxygen deficiency reaction tank (3) is equipped with the water inlet respectively, the pipe connection of water inlet is in same water intake pipe (12), the end of second grade aerobic reaction tank (4) is equipped with outlet pipe (13), one side that is close to the water inlet in one-level oxygen deficiency reaction tank (1) is equipped with adjustable water conservancy diversion folded plate (7), the both sides lateral wall symmetry of one-level aerobic reaction tank (2) is equipped with regional half arc guiding wall I (8) and regional half arc guiding wall II (9), be equipped with filler (11) in the second grade AO system, the end of second grade aerobic reaction tank (4) is equipped with air stripping device (5), set up aeration systems in one-level aerobic reaction tank (2) and second grade aerobic reaction tank (4) respectively.

2. The combined A/O system for treating rural sewage according to claim 1, wherein: the adjustable diversion folded plate (7) is axially fixed through a vertical shaft, a steering travel switch is arranged at the top end of the vertical shaft, the bottom of the rotating surface of the adjustable diversion folded plate (7) is embedded in a sliding track at the bottom of the first-stage anoxic reaction tank (1) through a ball, and the adjustable diversion folded plate (7) is obliquely tangential to the flow direction of inlet water.

3. The combined A/O system for treating rural sewage according to claim 2, wherein: regional half arc guiding wall I (8) and regional half arc guiding wall II (9) comprise a plurality of half arc barricades, and both ends dispose the fixed axle respectively about the half arc barricade, and the vertical dislocation of fixed axle is arranged.

4. The combined A/O system for treating rural sewage according to claim 3, wherein: and three flow impellers (6) are arranged in the first-stage anoxic reaction tank (1) and are respectively positioned at three top angles of the first-stage anoxic reaction tank (1).

5. The combined A/O system for treating rural sewage according to claim 4, wherein: the aeration systems of the primary aerobic reaction tank (2) and the secondary aerobic reaction tank (4) are divided into a plurality of zone modules, each zone is provided with an independent air supply branch pipe, and each branch pipe is provided with an electromagnetic valve with adjustable opening.

6. The combined A/O system for treating rural sewage according to claim 5, wherein: the primary aerobic reaction tank (2) and the secondary aerobic reaction tank (4) are respectively provided with a dissolved oxygen detector and a dissolved oxygen control module, the output end of the dissolved oxygen detector is connected with the input end of the dissolved oxygen control module, and the output end of the dissolved oxygen control module is connected with the input end of the electromagnetic valve.

7. The combined A/O system for treating rural sewage according to claim 6, wherein: and an outlet pipeline of the gas stripping device (5) extends to a water inlet turbulent flow region of the primary anoxic reaction tank (1).

8. The combined A/O system for treating rural sewage according to claim 7, wherein: the filler comprises a bio-composite filler or an MBBR bio-filler.