WO2023178966A1

WO2023178966A1 - Modular multi-stage biochemical-filtering sewage treatment system

Info

Publication number: WO2023178966A1
Application number: PCT/CN2022/121626
Authority: WO
Inventors: 汤丁丁; 程飞跃; 周艳; 赵皇; 秦雄; 郑碧娟; 王媛
Original assignee: 中建三局绿色产业投资有限公司
Priority date: 2022-07-19
Filing date: 2022-09-27
Publication date: 2023-09-28
Also published as: CN115231704A

Abstract

Provided in the present invention is a modular multi-stage biochemical-filtering sewage treatment system, comprising at least one sewage treatment area, wherein each sewage treatment area comprises a first biochemical area, a first filtering area, a second biochemical area and a second filtering area which are sequentially in communication; one side of the first biochemical area is connected to a water inlet; a tail end of the second filtering area is connected to a clean water area; the tail end of the clean water area is provided with a water outlet; and the bottoms of the first biochemical area and the second biochemical area are provided with an aeration device. The sewage treatment system can integrate biochemical sewage treatment and mud-water separation; the first biochemical area is an anoxic area, and the second biochemical area is an aerobic zone, such that a multi-stage biochemical-filtrating treatment can be achieved; and in practical application, the number of sewage treatment areas can be adjusted according to the characteristics of sewage in an area to be subjected to treatment, thereby improving the practicability of the treatment system. By the above means, a biochemical sewage treatment and mud-water separation can be integrated without providing a sedimentation tank, thereby effectively reducing the cost of a sewage treatment process.

Description

Modular multi-stage biochemical-filtration sewage treatment system

Technical field

The invention relates to the technical field of sewage treatment, and in particular to a modular multi-stage biochemical-filtration sewage treatment system.

Background technique

At present, the actual operation process of biological treatment of rural sewage in my country may have problems such as high cost, heavy operation and maintenance workload, and unstable operation. The most commonly used AAO and AO series processes often require a higher sludge reflux ratio and digestion liquid reflux ratio to ensure that the system has sufficient sludge concentration and TN removal effect. The existing reflux methods are mainly water pump reflux and gas stripping. Return flow, and water pump return flow will cause difficulties in equipment selection for rural sewage treatment on a small scale, and will lead to problems such as difficult operation and management and high energy consumption of equipment operation; while using air lift return flow, although a fan can be used It meets the needs of aeration and reflux, but it is often difficult to control the reflux ratio during the reflux process, and the reflux medium requires a large amount of air as power, which has a greater impact on the dissolved oxygen of the reflux liquid, making it difficult to ensure the dissolved oxygen demand for biological denitrification and phosphorus removal.

In the biological sewage treatment process, because no chemical products are used, natural microorganisms in biological agents are used to remove pollutants in the sewage. This process has high treatment efficiency, good effluent quality, and will not cause secondary damage to the environment. pollution and other advantages. Among them, membrane bioreactors and ecological treatment measures are most commonly used in biological treatment processes. Membrane bioreactors can avoid sludge backflow, extend sludge age, increase sludge concentration, and have better treatment effects. However, this The investment and operation costs of the process are high, and ecological treatment measures require relevant professionals to manage, so they are not suitable for rural areas; ecological treatment measures have low energy consumption and simple operation and management, but because the treatment load of ecological treatment processes is generally low, As a result, the equipment occupies a large area, and the problem of filler clogging is difficult to solve, making it difficult for the artificial wetland to operate stably for a long time; in low-temperature areas, the treatment effect of the artificial wetland is greatly reduced.

In the existing technology, the application number is 201510902437.9, and the publication date is August 28, 2018. In the invention patent titled "An integrated sewage treatment device", mud-water mixing zones are successively set up in the length direction of the box - a The first-level biochemical zone - the second-level biochemical zone, and uses the backflow mechanism to return part of the sludge and part of the mixed liquid in the second-level biochemical zone to the mud-water mixing zone and then back to the first-level biochemical zone to form a cycle. The nitrification liquid returned in the second-level biochemical zone Denitrification occurs in the anoxic primary biochemical zone to remove total nitrogen and improve sewage treatment capacity; in addition, the mud-water mixing zone mixes the returning sludge, incoming water and the mixed liquid returning from the secondary biochemical zone and then mixes the mud and water. The partition of the zone overflows into the first-level biochemical zone, which on the one hand plays the role of buffering the water flow and making the liquid more fully mixed. In the above technical solution, the denitrification reaction in the primary biochemical zone is promoted by refluxing the nitrification liquid, thereby improving the sewage treatment capacity. Although the above process can improve the sewage treatment capacity, the circulation process between the biochemical zones cannot effectively remove the sludge in the sewage, and the denitrification effect of the process of using nitrification liquid backflow to promote the denitrification reaction is not high.

In the prior art, the utility model with publication number CN213739096U is provided with an integrated high-efficiency sewage treatment equipment. The above-mentioned equipment includes an equipment outer wall. The interior of the equipment outer wall is divided into several compartments by a plate body, including sequentially connected Anaerobic zone, first anoxic zone, first aerobic zone, second anoxic zone, second aerobic zone, sedimentation and clarification zone and high-efficiency fiber filter; part of the sewage enters the anaerobic zone for acidification treatment, and the effluent enters the third It is processed in an anoxic zone, and the effluent enters the first aerobic zone for treatment; the other part of the sewage enters the second anoxic zone for treatment together with the effluent from the first aerobic zone, and the effluent enters the second aerobic zone for treatment, and the effluent enters In the sedimentation and clarification area, phosphorus removal agent is added to the sedimentation and clarification area to remove phosphorus. In the sedimentation and clarification area, the mud and water are separated, and the effluent enters the high-efficiency fiber filter for filtration, and the effluent is disinfected. Although the above technical solution can efficiently treat sewage, the sedimentation area and filter increase the floor area of the equipment. At the same time, setting the filter at the end of the equipment requires the sludge to flow back to achieve mud-water separation. , reducing the efficiency of sewage treatment, increasing the operating energy consumption and difficulty of operation, maintenance and management of the sewage treatment system.

In view of this, it is necessary to design an improved modular multi-stage biochemical-filtration sewage treatment system to solve the above problems.

Contents of the invention

The purpose of the present invention is to provide a modular multi-stage biochemical-filtration sewage treatment system.

In order to achieve the above-mentioned object of the invention, the present invention provides a modular multi-stage biochemical-filtration sewage treatment system. The sewage treatment system includes at least one sewage treatment area. The sewage treatment area includes a first biochemical area, a third biochemical area, and a third sewage treatment area that are connected in sequence. a filtration area, a second biochemical area and a second filtration area;

One side of the first biochemical zone is connected to the water inlet, the end of the second filter zone is connected to the clean water zone, and the end of the clean water zone is provided with a water outlet. The first biochemical zone and the second biochemical zone An aeration device is installed at the bottom of the zone, and the sewage treatment system can integrate sewage biochemical treatment and mud-water separation.

Preferably, the first biochemical zone is an anoxic zone, and the second biochemical zone is an aerobic zone.

Preferably, the residence time of the sewage in the first biochemical zone and the second biochemical zone is both 2 to 6 hours.

Preferably, several detachable filter assemblies are arranged side by side in the first filter, and the filter assemblies include a fixed frame and flexible fillers respectively provided on both sides of the fixed frame.

Preferably, the thickness of the flexible filler is 2 to 5 cm.

Preferably, the number of filter components is 1 to 20.

Preferably, the first filter area is provided with a plurality of installation slots, and corresponding positions on the fixed frame are provided with installation blocks that can be clamped in the installation slots.

Preferably, the number of the installation slots is not less than the number of the installation blocks.

Preferably, the fixed frame is quadrangular, and a fixing piece for fixing the flexible filler is provided inside the fixed frame.

Preferably, the first filtration zone and the second filtration zone are anoxic zones.

The beneficial effects of the present invention are:

1. The modular multi-stage biochemical-filtration sewage treatment system proposed by the present invention includes at least one sewage treatment area. The sewage treatment area is arranged in a sequentially connected first biochemical area, first filtration area, second biochemical area and third There are two filtration zones, and the first biochemical zone is an anoxic zone, and the second biochemical zone is an aerobic zone, which can realize multi-stage biochemical-filtration treatment, so that there is no need to set up a sedimentation tank, and there is no need for sludge reflux and digestive juice reflux. It can remove pollutants in sewage and achieve mud-water separation. Through the above method, the area occupied by the sewage treatment system is reduced, and the operating energy consumption and operation, maintenance and management difficulty of the sewage treatment system are reduced.

2. The modular multi-stage biochemical-filtration sewage treatment system proposed by the present invention makes the overall filtration system present a multi-stage AO form by setting the first biochemical zone and the second biochemical zone to alternate anoxic and aerobic zones. It helps to strengthen the denitrification effect; by setting up a filter area at the end of each level of biochemical zone, the sewage after biochemical treatment can be filtered, so that the activated sludge is intercepted in the biochemical zone, which is beneficial to prolonging the sludge age and has the effect of Helps the reproduction of nitrifying bacteria and promotes biological denitrification; by setting up multiple sets of detachable filter components in the filter area, and using flexible fillers to achieve the purpose of filtration, it not only facilitates the installation and disassembly of the filter components, but also ensures the filtration effect At the same time, it ensures that the sewage has a high filtration flux in the filter assembly. In addition, since the sewage passes through the filter assembly one by one, it will only block the filter assembly that passes through it first, and the subsequent filter assembly will not be easily clogged. Furthermore, it is removable The way to set up the filter component is that when the filter component is clogged, it can be replaced with the filter component at the end of another filter area, and the internal water can be used for backwashing, or it can be cleaned offline. The above process effectively solves the problem of filtration. The problem of blocked components has been solved, and the recycling of filter components has been realized, effectively improving the practicality of the sewage treatment system. In addition, the flexible filler on the filter component has external aerobic and internal local anoxia, which can realize denitrification, denitrification and denitrification. Partially synchronized nitrification and denitrification function. The sewage treatment system proposed by the present invention performs alternating biochemical and filtration treatment of sewage by utilizing biochemical zones and filtration zones arranged at intervals, and at the same time, flexible fillers that can promote the denitrification effect are provided inside the filtration zone to improve the denitrification effect. In addition, In actual applications, a sewage treatment area can also be added as needed. Through the above method, the sewage treatment efficiency is effectively improved, and the biochemical treatment of sewage and mud water separation can be integrated without setting up a sedimentation tank, effectively reducing the cost of the sewage treatment process. .

Description of the drawings

Figure 1 is a schematic structural diagram of the modular multi-stage biochemical-filtration sewage treatment system of the present invention;

Figure 2 is a schematic structural diagram of the filter assembly in Figure 1;

Figure 3 is a schematic structural diagram of a single filter component in Figure 2;

Figure 4 is a schematic structural diagram of the filter assembly in Figure 3;

Figure 5 is a flow chart of the modular multi-stage biochemical-filtration sewage treatment system of the present invention;

The reference numbers are as follows:

100. Modular multi-stage biochemical-filtration sewage treatment system; 10. Sewage treatment area; 20. First biochemical area; 21. Water inlet; 30. First filtration area; 31. Filter components; 311. Fixed frame; 312. Flexible filler; 40. Second biochemical zone; 50. Second filtration zone; 51. Clean water zone; 511. Water outlet; 60. Aeration device.

Detailed ways

In order to make the purpose, technical solutions and advantages of the present invention clearer, the present invention will be described in detail below with reference to the drawings and specific embodiments.

Here, it should also be noted that, in order to avoid obscuring the present invention with unnecessary details, only the structures and/or processing steps closely related to the solution of the present invention are shown in the drawings, and the details related to the present invention are omitted. Invent other details that are less relevant.

Additionally, it should be noted that the terms "comprises," "comprises," or any other variation thereof are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that includes a list of elements includes not only those elements, but also It also includes other elements not expressly listed or that are inherent to the process, method, article or equipment.

Referring to Figures 1 to 5, the present invention provides a modular multi-stage biochemical-filtration sewage treatment system 100. The above-mentioned sewage treatment system includes at least one sewage treatment area 10, and each sewage treatment area includes a first biochemical area connected in sequence. 20. The first filtration area 30, the second biochemical area 40 and the second filtration area 50. One side of the first biochemical area 20 is connected to the water inlet 21, and the end of the second filtration area 50 is connected to the clean water area 51. The clean water area 51 A water outlet 511 is provided at the end, and an aeration device 60 is provided at the bottom of the first biochemical zone 20 and the second biochemical zone 40 to control the above-mentioned biochemical zones to be in an anoxic or aerobic state. By using the above system to perform multi-stage biochemical treatment and filtration of sewage, the integration of sewage biochemical treatment and mud and water separation is achieved, which improves the removal efficiency of solid suspended matter in sewage and improves the denitrification effect.

Referring to Figures 1 to 4, an aeration device 60 is provided at the bottom of the first biochemical zone 20 and the second biochemical zone 40, so that the first biochemical zone 20 is an anoxic zone and the second biochemical zone 40 is an aerobic zone. The denitrification reaction of sewage occurs in the first biochemical zone 20, and the nitrification reaction occurs in the second biochemical zone 40, and the residence time of the sewage in the first biochemical zone 20 and the second biochemical zone 40 is 2 to 6 hours, ensuring the sufficient biochemical reaction. It can also facilitate the sedimentation of sludge in sewage.

Further, the first filtration area 30 is disposed at the end of the first biochemical area 20. A number of detachable filter assemblies 31 are arranged side by side in the first filtration area 30. The number of the filter assemblies 31 is 1 to 20. In the filter assemblies 31 The filter assembly 31 includes a fixed frame 311 and flexible fillers 312 respectively provided on both sides of the fixed frame 311. The fixed frame 311 is quadrilateral. There are fixing pieces for fixing the flexible filler to ensure that the flexible filler 312 can be stably fixed on the fixed frame 311 and can meet the strength requirements of the filter assembly 31 during the encouragement process of the sewage plant. The thickness of the flexible filler 312 on each side is 2 ~ 5cm. Since the filter area is in an anoxic state, a certain amount of denitrifying microorganisms can grow on the flexible filler 312, thereby improving the denitrification and denitrification effect. The flexible filler 312 in this embodiment is a polyurethane sponge. In other implementations In this example, other materials can also be used, as long as they can meet the requirements for the strength, filtration resistance and filtration flux of the filter component 31 during filtration, and are not limited to this here.

In particular, the filter assembly 31 is detachably disposed in the first filter area 30. Specifically, the first filter area 30 is provided with a number of installation slots (not shown in the figure). The corresponding positions on the fixed frame 311 of the filter assembly 31 are There are installation blocks (not numbered in the figure) that can be stuck in the installation slots, and the number of installation slots is not less than the number of installation blocks. This arrangement can facilitate the installation and removal of the filter assembly 31; in addition, , when the first filter area 30 is clogged, the filter assembly 31 close to the first filter area 30 and the filter assembly 31 at the end of the second filter area 50 can be replaced, and the filter assembly 31 removed from the first filter area 30 can be replaced. The component 31 is installed at the end of the second filter area 50 with the filtering surface of the filtering component 31 facing outward. The filtering surface is backwashed using the hydraulic power inside the system. The removed filtering component 31 can also be directly cleaned offline. Through the above settings, the pretreated sewage can pass through each level of biochemical zone and filtration zone in sequence, and the sewage can be biochemically and filtered alternately, so that the concentration of pollutants and activated sludge concentration in the sewage can be gradually reduced. At the same time, After each filtration, the activated sludge is trapped in the filtration area, which realizes the separation of sludge and hydraulics, prolongs the sludge age, helps nitrifying bacteria reproduce, and promotes biological denitrification. The second filtration area 50 is disposed at the end of the second biochemical area 40, and its structure is basically the same as that of the first filtration area 30, which will not be described again here. It should be noted that in the actual application process, the composition of the sewage treatment area can also be adjusted according to the pollutants in the sewage. When the concentration of pollutants in the sewage is very low, only the first biochemical zone 20 and the first biochemical zone 20 can be set. In the filtering area 30, when the concentration of pollutants in the sewage is very high, the sewage treatment area can be adaptively added according to actual needs.

Working principle of the present invention: When applying the modular multi-stage biochemical-filtration sewage treatment system 100 proposed by the present invention for sewage treatment, the pretreated sewage is first introduced into the first biochemical zone 20 through the water inlet 21. Since this area is lacking Oxygen state, denitrification reaction occurs in this area, then, the hydraulic treated by the first biochemical zone 20 passes through the first filtering zone 30, and the filter assembly 31 in the first filtering zone 30 can intercept the activated sludge in the hydraulic, The sludge is allowed to stay in the first biochemical zone 20 . Then, the water filtered by the first filtration zone 30 enters the aerobic second biochemical zone 40 for a second biochemical reaction. Finally, through the filtration of the second filtration zone 50, a clean water body is obtained. If the water body at this time is still If there are pollutants, the water body can be further biochemically and filtered by adding a sewage treatment area until the water body is free of pollutants. Those skilled in the art should understand that after adding a sewage treatment tank, the first first biochemical zone 20 should be connected to the water inlet 21 , and the last second filter zone 50 should be connected to the clean water zone 51 .

To sum up, the modular multi-stage biochemical-filtration sewage treatment system 100 of the present invention includes at least one sewage treatment area. The sewage treatment area includes a first biochemical area 20, a first filtration area 30, and a first sewage treatment area connected in sequence. The second biochemical zone 40 and the second filter zone 50; one side of the first biochemical zone 20 is connected to the water inlet 21, the end of the second filter zone 50 is connected to the clean water zone 51, and the end of the clean water zone 51 is provided with a water outlet 511. The bottoms of the first biochemical zone 20 and the second biochemical zone 40 are connected to the aeration device 60, and the sewage treatment system can realize the integration of sewage biochemical treatment and mud water separation; by making the first biochemical zone 20 an anoxic zone, the second biochemical zone 40 It is an aerobic zone and can achieve multi-stage biochemical-filtration treatment. Through the above method, the efficiency of sewage treatment is effectively improved, and the biochemical treatment of sewage and mud water separation can be integrated without setting up a sedimentation tank, effectively reducing the cost of the sewage treatment process.

The above embodiments are only used to illustrate the technical solutions of the present invention and are not limiting. Although the present invention has been described in detail with reference to the preferred embodiments, those of ordinary skill in the art should understand that the technical solutions of the present invention can be modified or equivalently substituted. without departing from the spirit and scope of the technical solution of the present invention.

Claims

A modular multi-stage biochemical-filtration sewage treatment system, characterized in that the sewage treatment system includes at least one sewage treatment area, and the sewage treatment area includes a first biochemical area, a first filtration area, and a second sewage treatment area that are connected in sequence. Biochemical area and second filtration area;

One side of the first biochemical zone is connected to the water inlet, the end of the second filter zone is connected to the clean water zone, and the end of the clean water zone is provided with a water outlet. The first biochemical zone and the second biochemical zone An aeration device is installed at the bottom of the zone, and the sewage treatment system can integrate sewage biochemical treatment and mud-water separation.
The modular multi-stage biochemical-filtration sewage treatment system according to claim 1, wherein the first biochemical zone is an anoxic zone and the second biochemical zone is an aerobic zone.
The modular multi-stage biochemical-filtration sewage treatment system according to claim 1, characterized in that the residence time of the sewage in the first biochemical zone and the second biochemical zone is 2 to 6 hours.
The modular multi-stage biochemical-filtration sewage treatment system according to claim 1, characterized in that, a plurality of detachable filter components are arranged side by side in the first filter, and the filter components include a fixed frame and a fixed frame respectively arranged on the Flexible padding on both sides of the frame.
The modular multi-stage biochemical-filtration sewage treatment system according to claim 4, characterized in that the thickness of the flexible filler is 2 to 5 cm.
The modular multi-stage biochemical-filtration sewage treatment system according to claim 4, characterized in that the number of the filter components is 1 to 20.
The modular multi-stage biochemical-filtration sewage treatment system according to claim 6, characterized in that a plurality of installation slots are provided in the first filtering area, and corresponding positions on the fixed frame are provided with clamping devices. The installation block in the installation card slot.
The modular multi-stage biochemical-filtration sewage treatment system according to claim 7, characterized in that the number of the installation slots is not less than the number of the installation blocks.
The modular multi-stage biochemical-filtration sewage treatment system according to claim 4, wherein the fixed frame is quadrilateral, and a fixing piece for fixing the flexible filler is provided in the fixed frame.
The modular multi-stage biochemical-filtration sewage treatment system according to claim 1, characterized in that the first filtration zone and the second filtration zone are anoxic zones.