CN118221296A

CN118221296A - Sewage treatment system for alpine service and parking area

Info

Publication number: CN118221296A
Application number: CN202410380132.5A
Authority: CN
Inventors: 卢洪青
Original assignee: Lanzhou Kaisanuo Environmental Protection Technology Co ltd
Current assignee: Lanzhou Kaisanuo Environmental Protection Technology Co ltd
Priority date: 2024-03-30
Filing date: 2024-03-30
Publication date: 2024-06-21

Abstract

The invention relates to the technical field of sewage treatment, in particular to a sewage treatment system for high and cold service and parking areas, which comprises a septic tank, an adjusting tank, a pretreatment tank, a first anaerobic tank, a first aerobic tank, a second anaerobic tank, a second aerobic tank, a sedimentation tank, a first middle water tank, a filter tank and a reclaimed water recycling tank which are connected through pipelines in sequence, and has the beneficial effects that: according to the present situation of sewage in road service areas and parking areas in alpine regions and the problems in the traditional process, the invention analyzes factors such as the limitation and instability of the original process and researches more suitable sewage treatment equipment, thereby achieving the effects of energy conservation and emission reduction.

Description

Sewage treatment system for alpine service and parking area

Technical Field

The invention relates to the technical field of sewage treatment, in particular to a sewage treatment system for severe cold service and parking areas.

Background

The construction of a highway service area in a high and cold arid area is an important link for promoting economic development and traffic convenience, however, the area has the problem of water resource shortage. In order to solve this problem and achieve efficient use of water resources, research and development of sustainable sewage treatment systems is becoming an urgent need.

Expressway service areas of alpine arid regions are often located far from busy roads, and thus one of the main problems faced is water supply difficulty. The conventional tap water supply method requires a large amount of electricity and water resources, and has a long transportation distance, so that the cost is high and the tap water supply method is not sustainable. Because of the climate characteristics of the alpine arid region, rainwater resources are deficient, and the development and utilization of a sewage treatment and recycling system become a feasible solution.

The sewage treatment system of the expressway service area in the alpine dry and early area needs to have the capability of adapting to the climate characteristics of the area, and meanwhile, the quality of water is ensured to reach the national relevant standard. One possible solution is to design a centralized treatment system to collect and treat the wastewater in the area. Firstly, removing suspended matters by physical removal of dirt and a sedimentation tank, then performing biological treatment to remove organic matters in sewage, and finally removing residual organic matters and microorganisms by using a chemical treatment process such as an oxidation method or a depth filtration method. Finally, after post-treatment, the water quality requirement of the national relevant standard is met. Such centralized processing systems require a large footprint, high capital investment, and personnel for operation and maintenance. But because the expressway service area has more personnel, the centralized treatment system can treat a large amount of sewage, and is suitable for the scene.

Disclosure of Invention

Aiming at the defects of the prior art, the invention provides a sewage treatment system for severe cold service and parking areas, which analyzes factors such as the limitation and instability of the original process and researches a more suitable sewage treatment system.

In order to achieve the above purpose, the present invention provides the following technical solutions:

A sewage treatment system for severe cold service and parking areas is characterized by comprising a septic tank 1, an adjusting tank 2, a pretreatment tank 3, a first anaerobic tank 4, a first aerobic tank 5, a second anaerobic tank 6, a second aerobic tank 7, a sedimentation tank 8, a first middle water tank 9, a filter tank 10 and a reclaimed water recycling tank 11 which are sequentially connected through pipelines, wherein two first lifting pumps 18 are arranged on the pipeline between the adjusting tank 2 and the pretreatment tank 3, the pretreatment tank 3 is connected with the first anaerobic tank 4 and the second anaerobic tank 6 through pipelines, a second lifting pump 19 is arranged on the pipeline between the pretreatment tank 3 and the first anaerobic tank 4 and the second anaerobic tank 6, a first return pipe is arranged between the second aerobic tank 7 and the second anaerobic tank 6, a return pump 20 is arranged on the first middle water tank 9, a second lifting pump 18 is arranged between the sedimentation tank 8 and the first anaerobic tank 4, a switch 21 is arranged on the first pipeline between the first middle water tank 8 and the first pipeline 9, and a ball valve 19 is arranged between the filter tank 10 and the second lifting pump 22 is arranged on the pipeline between the first return pipe and the filter tank 10.

The pretreatment tank 3 is connected with a first chemical feeder 13 and a fan 18 through pipelines, the first aerobic tank 5 is connected with a fourth chemical feeder 16 and a fan 18 through pipelines, the second anaerobic tank 6 is connected with a fan 18 through pipelines, the first intermediate tank 9 is connected with a second chemical feeder 14 through pipelines, and the reclaimed water recycling tank 11 is connected with a third chemical feeder 15 through pipelines.

A liquid level meter and a flowmeter are arranged in the regulating tank 2. The device is used for controlling liquid level and water quantity detection, so that the whole water inlet of the device tends to be stable, and the problem of large water quality and water quantity change in a special time period is solved to a certain extent.

And a PH on-line monitoring device is arranged in the pretreatment tank 3.

And mixers are arranged in the first anaerobic tank 4 and the second anaerobic tank 6.

The fillers in the first anaerobic tank 4 and the second anaerobic tank 6 are composite fillers, and the composite fillers are sponge iron.

The fillers in the first aerobic tank 5 and the second aerobic tank 7 are biological rope fillers.

The sewage treatment method for the alpine service and the parking area is characterized by comprising the following steps of:

Firstly, sewage firstly flows into a septic tank 1 and then flows into an adjusting tank 2;

Step two, the wastewater flows into a pretreatment tank 3 after being regulated by a regulating tank 2, wherein the main treatment mode in the pretreatment tank 3 is a stripping method, and a single fan is matched, so that the wastewater has high ammonia nitrogen content and often contains a large amount of toxic and harmful dissolved gases such as carbon dioxide, hydrogen sulfide and the like, wherein the health of human bodies is damaged, and pipeline equipment is corroded, so that the stripping method is needed for removing the gases and consuming ammonia nitrogen; the specific principle is that the difference between the actual concentration and the equilibrium concentration of volatile substances such as ammonia nitrogen contained in the wastewater is utilized, air is used for stripping under alkaline conditions, and the concentration of ammonia gas in a gas phase is changed due to the fact that gas is continuously discharged in the stripping process, so that the actual concentration is always smaller than the equilibrium concentration under the condition, finally, ammonia dissolved in the wastewater continuously passes through a gas-liquid interface, NH3-N in the wastewater is removed, and air is often used as a carrier. Ammonia stripping is a mass transfer process, the driving force is from the difference between the partial pressure of ammonia in the air and the equilibrium partial pressure corresponding to the concentration of ammonia in the wastewater, and the partial pressure of the gas component at the liquid level and the concentration in the liquid accord with the henry's theorem, namely, the proportional relationship. This method is also called "ammonia analysis method", and the analysis rate is related to the temperature and the gas-liquid ratio. The basic principle of the stripping method is the theory of gas-liquid phase balance and mass transfer speed. The NH3-N in the wastewater usually exists in a state of holding and balancing ammonium ions (NH4+) and free ammonia (NH 3), and the PH value also affects the treatment effect of the method, so that PH on-line monitoring is installed in pretreatment to monitor the PH value in real time, and a dosing system is matched to adjust the PH value to achieve the optimal state.

Step three, wastewater enters a biochemical tank for further biochemical treatment after being pretreated by a pretreatment tank 3, the biochemical tank consists of an AO+AO multipoint water inlet process, however, in consideration of the particularity of the wastewater, the traditional biological carrier filler in the biochemical tank is replaced, and two fillers of A (anaerobic tanks) are replaced by composite fillers, wherein the composite fillers are novel water treatment materials which are gradually applied, and in the water treatment application, the functions of electrochemical enrichment, oxidation-reduction reaction, adsorption, flocculation precipitation and the like are mainly utilized, so that the treatment effect is better; a (anaerobic tank) is internally provided with a submersible mixer, which can prevent pollutant from precipitating and can not destroy anaerobic environment; the system is matched with a carbon source adding device, and a proper amount of carbon source is timely supplemented to the system, so that the whole system can be operated better; and the O (aerobic tank) is filled with biological rope filler, so that enough habitat is provided for aerobic microorganisms to perform nitrification, a fan arranged between the devices is used for supplying oxygen, and a ball valve and a rotameter are respectively arranged on an air pipe of the fan, so that the air quantity can be better controlled, and the tank body is in the optimal aerobic environment.

The function of the nitrification liquid reflux pump matched with the aerobic tank is as follows:

1. Increasing ammonia oxidation duty ratio of nitrifying liquid pond

In the sewage treatment process, a nitrifying liquid pond is a main place for ammoxidation reaction. However, ammonia nitrogen and oxygen in the nitrifying liquid pond cannot be kept balanced due to the influence of external factors, so that the efficiency of the nitrifying reaction is reduced. At this time, the nitrifying liquid reflux technology can well solve the problem.

Specifically, the nitrifying liquid is refluxed by re-injecting the treated nitrifying liquid into the ammoxidation reaction tank, so that the nitrifying liquid content in the ammoxidation reaction tank is increased, and the balance degree of ammonia nitrogen and oxygen in the nitrifying liquid is improved, thereby improving the efficiency of the nitrifying reaction. Meanwhile, through backflow, the oxygen concentration of the nitrifying liquid is increased, and the ammonia oxidation level in the sewage can be improved.

2. Ensuring the stable operation of the system

Besides improving the ammonia oxidation ratio of the nitrifying liquid pond, the nitrifying liquid backflow has an important function of ensuring the stable operation of the system. In sewage treatment, the nitrifying liquid pool is a very important component. If the ammonia oxidation reaction speed in the nitrifying liquid pond can not meet the sewage treatment requirement, the system is out of control, and even breakdown occurs.

The nitrifying liquid reflux technology can directly inject the treated nitrifying liquid into the ammoxidation reaction tank, improves the stability of the system, and can avoid problems in wastewater treatment, such as high system load, unbalanced ammonia nitrogen concentration and the like.

Step four, the effluent of the second-stage aerobic tank of the biochemical system enters a sedimentation tank 8, and the sedimentation tank 8 is important wastewater treatment equipment, and mainly aims to remove suspended particles and suspended liquid particles in wastewater; a sludge reflux pump is arranged in the sedimentation tank 8, part of sludge in the sedimentation tank is refluxed to the front biochemical tank, and the purpose of the reflux sludge is to keep a certain suspended solid concentration in the aeration tank, namely a certain microorganism concentration;

Step five, supernatant fluid of the sedimentation tank 8 flows into a first intermediate water tank 9 through a sedimentation tank water outlet weir, the first intermediate water tank 9 is matched with a coagulant aid adding device, and the adding of the medicines is controlled by a sensing switch, so that the medicines can be ensured to be timely and accurately added for secondary sedimentation;

Step six, the supernatant of the first intermediate water tank 9 is lifted into a filter tank 10 between devices through a self-priming pump to be filtered, and a stainless steel precise filter is arranged in the filter tank 10, so that the effluent reaches the treatment standard;

And seventh, the effluent of the filter in the filter tank 10 enters the reclaimed water recycling tank 11, and is recycled after being disinfected by a disinfection dosing device matched with the reclaimed water recycling tank 11, so that the effluent quality is ensured to reach the standard, and no secondary pollution is caused.

The apparatus of the system of the present invention can be generally divided into two parts: and a supporting device is arranged between the outdoor underground treatment device and the indoor device.

The outdoor buried treatment equipment is made of glass fiber reinforced plastic, the glass fiber reinforced plastic tank body is added with heat insulation materials in the manufacturing process, and the equipment adopts a buried installation mode, so that the problem of poor treatment effect of the equipment caused by low temperature can be better solved, and the equipment can still stably operate in a low-temperature environment. The glass fiber reinforced plastic tank body has the advantages of light weight, high strength, corrosion resistance, good insulativity and the like.

In order to ensure the burial depth, the equipment tank body is designed to be 5-8 meters, and the tank body has the following dimensions according to the actual treatment capacity: the tank bodies in different functional areas can be independently installed and combined for use according to the water treatment quantity requirements, and the failure rate and the maintenance cost of the equipment are greatly reduced.

The indoor equipment room installation corollary equipment includes: one set of PLC automatic control cabinet, four sets of medicament adding equipment, three aeration fans, two self-priming pumps, one filter and one set of recycling water supply unit.

The invention has the beneficial effects that: according to the current sewage situation of road service areas and parking areas in northwest areas and the problems existing in the traditional process, the invention analyzes factors such as the limitation and instability of the original process and researches more suitable sewage treatment equipment.

Drawings

FIG. 1 is a schematic diagram of a system according to the present invention.

Detailed Description

The following description of the embodiments of the present invention will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present invention, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.

Example 1

A sewage treatment system for severe cold service and parking areas is shown in figure 1, and comprises a septic tank 1, an adjusting tank 2, a pretreatment tank 3, a first anaerobic tank 4, a first aerobic tank 5, a second anaerobic tank 6, a second aerobic tank 7, a sedimentation tank 8, a first middle water tank 9, a filter tank 10 and a reclaimed water recycling tank 11 which are sequentially connected through pipelines, wherein two first lifting pumps 18 are arranged on the pipeline between the adjusting tank 2 and the pretreatment tank 3, the pretreatment tank 3 is connected with the first anaerobic tank 4 and the second anaerobic tank 6 through pipelines, a second lifting pump 19 is arranged on the pipeline between the pretreatment tank 3 and the first anaerobic tank 4 and the second anaerobic tank 6, a first return pipe is arranged between the second aerobic tank 7 and the second anaerobic tank 6, a return pump 20 is arranged on the first middle water tank 9, a second lifting pump 18 is arranged between the sedimentation tank 8 and the first anaerobic tank 4, a return pipe 21 is arranged between the first middle water tank 8 and the first pipeline 9, a return pump 10 is arranged between the first return pipe and the filter tank 10, and a return pipe 22 is arranged between the second lifting pump 10 and the first return pipe 1.

And a PH on-line monitoring device is arranged in the pretreatment tank 3.

Example 2

A sewage treatment method for severe cold service and parking areas comprises the following steps:

1. Increasing ammonia oxidation duty ratio of nitrifying liquid pond

2. Ensuring the stable operation of the system

The outdoor buried treatment equipment is made of glass fiber reinforced plastic, the glass fiber reinforced plastic tank body is added with heat insulation materials in the manufacturing process, each functional area adopts an independent tank body structure, and the equipment adopts a buried vertical installation mode, so that the problem of poor treatment effect of the equipment caused by low temperature can be better solved, and the equipment can still stably run in a low-temperature environment. The glass fiber reinforced plastic tank body has the advantages of light weight, high strength, corrosion resistance, good insulativity and the like.

The indoor equipment room installation corollary equipment includes: one set of PLC automatic control cabinet, four sets of medicament adding equipment, three aeration fans, two self-priming pumps, one ultraviolet sterilizer, one filter and one set of recycling water supply unit.

The steel plate welding and corrosion prevention can be adopted according to the field conditions, the process and each functional area are unchanged, and the achieved effect is unchanged.

The embodiments of the present application have been described above with reference to the accompanying drawings, but the present application is not limited to the above-described embodiments, which are merely illustrative and not restrictive, and many forms may be made by those having ordinary skill in the art without departing from the spirit of the present application and the scope of the claims, which are to be protected by the present application.

Claims

1. A sewage treatment system for high-cold service and parking areas, characterized in that it comprises a septic tank (1), a regulating tank (2), a pretreatment tank (3), a first anaerobic tank (4), a first aerobic tank (5), a second anaerobic tank (6), a second aerobic tank (7), a sedimentation tank (8), a first intermediate water tank (9), a filtration tank (10) and a reclaimed water reuse tank (11) which are sequentially connected by pipelines, two first lifting pumps (18) are installed on the pipeline between the regulating tank (2) and the pretreatment tank (3), the pretreatment tank (3) is connected to the first anaerobic tank (4) and the second anaerobic tank (6) by pipelines, and ball valves are respectively installed on the pipelines, A second lifting pump (19) is installed on the pipeline between the pretreatment tank (3) and the first anaerobic tank (4) and the second anaerobic tank (6); a first return pipe is installed between the second aerobic tank (7) and the second anaerobic tank (6); a return pump (20) is installed on the first return pipe; a second return pipe is installed between the sedimentation tank (8) and the first anaerobic tank (4); a switch (21) is installed on the pipeline between the sedimentation tank (8) and the first intermediate water tank (9); two self-priming pumps (22) are installed on the pipeline between the first intermediate water tank (9) and the filter tank (10); and a third return pipe is installed between the filter tank (10) and the septic tank (1).

2. A sewage treatment system for high-cold service and parking areas according to claim 1, characterized in that: the pretreatment tank (3) is connected to a first dosing machine (13) and a fan (18) through a pipeline, the first aerobic tank (5) is connected to a fourth dosing machine (16) and a fan (18) through a pipeline, the second anaerobic tank (6) is connected to a fan (18) through a pipeline, the first intermediate water tank (9) is connected to a second dosing machine (14) through a pipeline, and the reclaimed water reuse tank (11) is connected to a third dosing machine (15) through a pipeline.

3. A sewage treatment system for high-cold service and parking areas according to claim 1, characterized in that a liquid level meter and a flow meter are provided in the regulating tank (2).

4. A sewage treatment system for high-cold service and parking areas according to claim 1, characterized in that a pH online monitoring device is provided in the pretreatment tank (3).

5. A sewage treatment system for high-cold service and parking areas according to claim 1, characterized in that a mixer is installed in the first anaerobic tank (4) and the second anaerobic tank (6).

6. A sewage treatment system for high-cold service and parking areas according to claim 1, characterized in that the fillers in the first anaerobic tank (4) and the second anaerobic tank (6) are composite fillers, and the composite fillers are sponge iron.

7. A sewage treatment system for high-altitude service and parking areas according to claim 1, characterized in that the fillers in the first aerobic pool (5) and the second aerobic pool (7) are biological rope fillers.

8. A method for treating wastewater in high-cold service and parking areas, comprising the following steps:

Step 1: First, the sewage flows into the septic tank (1) and then into the regulating tank (2);

Step 2: After being regulated in the regulating tank (2), the wastewater flows into the pretreatment tank (3). The main treatment method in the pretreatment tank (3) is the stripping method, which is equipped with a separate fan. The basic principle of the stripping method is the gas-liquid phase equilibrium and mass transfer rate theory. NH3-N in the wastewater usually exists in the state of ammonium ions (NH4+) and free ammonia (NH3) to maintain equilibrium. The pH value will also affect the treatment effect of the method. Therefore, a pH online monitor is installed in the pretreatment to monitor the pH value in real time, and a dosing system is equipped to adjust the pH value to reach the optimal state.

Step 3: After the wastewater is pretreated in the pretreatment tank (3), it enters the biochemical tank for further biochemical treatment. The biochemical tank is composed of an AO+AO multi-point water inlet process. The fillers of the two A (anaerobic tanks) are replaced with composite fillers. The composite fillers are mainly used in water treatment applications for their electrochemical enrichment, redox reaction, adsorption and flocculation precipitation functions, and the treatment effect is better. A submersible mixer is installed in the A (anaerobic tank) to prevent the precipitation of pollutants without destroying the anaerobic environment. The system is equipped with a carbon source dosing device to timely add an appropriate amount of carbon source to the system so that the entire system can operate better. The O (aerobic tank) is filled with biological rope fillers to provide sufficient habitats for aerobic microorganisms to carry out nitrification. Oxygen is supplied by a fan installed in the equipment room. A ball valve and a rotor flowmeter are installed in the fan air pipe respectively, which can better control the air volume so that the tank body is in the best aerobic environment.

Step 4: The effluent from the secondary aerobic tank of the biochemical system enters the sedimentation tank (8). The sedimentation tank (8) is an important wastewater treatment equipment. Its main function is to remove suspended particles and suspended liquid particles in the wastewater. The sedimentation tank is equipped with inclined tube fillers to make the water flow more stable and to achieve water purification through gravity sedimentation. A sludge return pump is installed in the sedimentation tank (8) to return part of the sludge in the sedimentation tank to the front-end biochemical tank. The purpose of returning the sludge is to maintain a certain suspended solid concentration in the aeration tank, that is, to maintain a certain microbial concentration.

Step 5: The supernatant of the sedimentation tank (8) flows into the first intermediate water tank (9) through the sedimentation tank outlet weir. The first intermediate water tank (9) is equipped with a coagulant dosing device. The dosing of the agent is controlled by a sensor switch, which can ensure that the agent can be added in a timely and accurate manner to perform secondary sedimentation.

Step 6: The supernatant in the first intermediate water tank (9) is pumped to the filter tank (10) between the equipment through a self-priming pump for filtration. The filter tank (10) is provided with a stainless steel precision filter to ensure that the effluent meets the treatment standard;

Step 7: The effluent from the filter in the filtration tank (10) enters the reclaimed water reuse tank (11), and is reused after being disinfected by the disinfection and dosing device and ultraviolet rays provided in the reclaimed water reuse tank (11), thereby ensuring that the effluent quality meets the standard and there is no secondary pollution, thereby achieving the effect of energy saving and emission reduction.