Sewage treatment device based on multi-medium soil infiltration technology

Abstract

A sewage treatment device based on a multi-medium soil percolation technology comprises a main treatment system which comprises a main treatment water inlet pipe, an MLS percolation unit, an MLS output pipe, a reservoir, a stored water output pipe and a main treatment water drainage pipe which are connected in sequence; at least two MLS percolation units are arranged in series; a water return pipe is connected between the reservoir and the main treatment water inlet pipe, and a circulating pump is connected in a pipeline of the water return pipe; a control valve is connected to the MLS output pipe, a drainage valve is connected between the stored water output pipe and the main treatment drainage pipe, a water quality sensor is arranged on the stored water output pipe, a water quantity sensor is arranged at the output end of the drainage valve, temperature sensors are arranged around the MLS percolation units, and each MLS percolation unit is provided with a liquid level sensor. The device is low in investment, small in occupied area, low in blocking rate and stable in treatment effect; some feedback mechanisms are added, automatic sewage treatment is realized according to feedback data control, intelligent automatic control is realized, and the system is convenient to install and use anywhere.

Description

Technical Field

[0001] The utility model relates to the technical field of sewage treatment, in particular to a sewage treatment device based on multi-media soil infiltration technology. Background Art

[0002] The multi-media soil layer (MLS) sewage treatment system has the advantages of large buffer capacity, good treatment effect, simple process, low investment and low operating cost. The system not only treats domestic sewage, but also improves the ecological environment, reflecting the new concept of combining sewage treatment with ecological environment construction. In the multi-media soil layer underground sewage treatment system, the three aspects of physical, chemical and biological sewage treatment technologies are comprehensively utilized. Among them, the degradation of organic pollutants is mainly completed by the metabolic activities of microorganisms. The water layer and soil layer structure in the MLS form multiple alternating aerobic and anaerobic environments, where microorganisms perform nitrification and denitrification to remove pollutants. The activity of microorganisms is closely related to the dissolved oxygen content in the internal environment of the system. When the dissolved oxygen content in the system is low, the activity and biochemical reactions of microorganisms will be inhibited. Under anaerobic conditions, microorganisms cannot carry out normal aerobic respiration, which restricts the nitrification and denitrification process of the system, so that nitrogen in the sewage cannot be effectively removed, and other reduced elements will also be enriched, which will affect the species distribution and metabolism of microorganisms in the system. Therefore, the amount of dissolved oxygen in the multi-media soil layer underground sewage treatment system is one of the important parameters for the system to effectively treat sewage.

[0003] However, the traditional MLS sewage treatment system generally adopts a single-stage water flow structure, which has a simple structure, a large footprint, low filler utilization, short hydraulic retention time, no backflow, resulting in a large water load, lack of aeration, resulting in poor nitrification-denitrification effect of the system and low overall removal rate; at the same time, the matrix of the internal filler of the MLS is easy to clog, the soil matrix used is easy to be washed away, the integrity of the filler is poor, the filling engineering volume is large, the applicability is not strong, and the service life is short. In addition, the traditional MLS sewage treatment system does not have real-time data online and big data cloud computing, and does not have functions such as intelligent control and autonomous decision-making. Utility Model Content

[0004] Based on the technical problems existing in the above-mentioned prior art, the utility model provides a sewage treatment device based on multi-media soil infiltration technology to solve the technical problems of the multi-media soil layer (MLS) sewage treatment system adopting a single-stage water-passing structure in the prior art, such as large footprint, low filler utilization, short hydraulic retention time, and poor sewage treatment effect.

[0005] To achieve the above-mentioned object, the utility model provides a sewage treatment device based on multi-media soil infiltration technology, which includes a main treatment system, wherein the main treatment system includes a main treatment water inlet pipe, an MLS infiltration unit, an MLS output pipe, a water storage tank, a water storage output pipe and a main treatment drainage pipe connected in sequence;

[0006] The MLS filtration units are at least two and arranged in series, each of the MLS filtration units is connected to an aeration pipe, and the aeration pipe is connected to an air pump;

[0007] A water return pipe is connected between the water storage tank and the main treatment water inlet pipe, and a circulating pump is connected in the pipeline of the water return pipe;

[0008] The MLS output pipe is connected to a control valve, a drain valve is connected between the water storage output pipe and the main treatment drain pipe, a water quality sensor is provided on the water storage output pipe, a water volume sensor is provided at the output end of the drain valve, a temperature sensor is provided around the MLS filtration unit, and a liquid level sensor is provided in each of the MLS filtration units;

[0009] The main processing system also includes a controller, and the vacuum pump, circulation pump, control valve, drain valve, water quality sensor, water volume sensor, temperature sensor, and liquid level sensor are all electrically connected to the controller. The controller collects sensor signals through the water quality sensor, water volume sensor, temperature sensor, and liquid level sensor and controls the vacuum pump, circulation pump, control valve, and drain valve.

[0010] As a further preferred technical solution of the utility model, the MLS infiltration unit includes a box body and a soil mixed layer material as a filler filled in the box body, and the soil mixed layer material includes at least two of soil, sawdust, charcoal, straw, jute and iron filings.

[0011] As a further preferred technical solution of the present invention, the types of soil mixing layer materials in each of the MLS infiltration units are different.

[0012] As a further preferred technical solution of the present utility model, the water quality sensor is a composite sensor for detecting COD, ammonia nitrogen, nitrogen and phosphorus content in water.

[0013] As a further preferred technical solution of the present invention, the controller is a single chip microcomputer, a PLC module or a computer.

[0014] As a further preferred technical solution of the present utility model, the sewage treatment device also includes a cabinet, and the main treatment system is arranged in the cabinet.

[0015] As a further preferred technical solution of the present invention, there are three MLS filtration units, and the three MLS filtration units and the water reservoir are horizontally distributed in two rows and two columns in the cabinet.

[0016] As a further preferred technical solution of the present utility model, the sewage treatment device also includes a pretreatment system, the water inlet end of the pretreatment system is connected to the domestic sewage drainage pipe, and the water outlet end of the pretreatment system is connected to the main treatment water inlet pipe.

[0017] As a further preferred technical solution of the utility model, a solid-liquid separation device and an ABR three-compartment septic tank are sequentially provided between the water inlet and the water outlet of the pretreatment system along the sewage flow direction.

[0018] As a further preferred technical solution of the present utility model, a water pump is provided in the pipeline of the main treatment water inlet pipe.

[0019] The sewage treatment device based on the multi-media soil infiltration technology of the utility model adopts the above technical scheme, which can achieve the following beneficial effects:

[0020] 1) The traditional MLS structure adopts a single-stage type, with only one container to fill the filler. Due to the single-stage type, a larger paving space area is required, and various fillers are also spread out in layers. In order to increase the infiltration time of sewage in each layer, the height of the container can only be increased, and the filling material can only be increased. This leads to an unsolvable contradiction between economy and treatment effect. The utility model adopts a three-dimensional design structure of multiple-stage communicating vessels to increase the vertical space, and the sewage slowly infiltrates from top to bottom or from bottom to top. The filling height of each layer of filler in an MLS infiltration unit is guaranteed, the sewage residence time is enhanced, and the cost of filling materials will not be increased;

[0021] 2) The sewage treatment of the utility model adopts a batch treatment method, which is to take in water in batches, and then circulate it through the MLS filtration unit for treatment. After the treatment is completed, it is drained after being judged to meet the standards, and then the next batch of water is treated. The purpose of this design is to ensure the length of time that the sewage passes through each type of filler and the time of chemical reaction.

[0022] 3) The utility model directly inputs external fresh air into the sewage through an air pump, providing a comfortable environment for microorganisms and being more conducive to the survival of microorganisms, thereby improving the sewage treatment capacity and effect of the MLS filtration unit.

[0023] 4) The advantages of the utility model over the traditional soil infiltration system are low investment, small footprint, low clogging rate, stable treatment effect and good economy;

[0024] 5) The utility model adds some feedback mechanisms by setting water quality sensors, water volume sensors, temperature sensors, etc., and realizes automatic sewage treatment according to feedback data control, realizes intelligent automatic control, and is easy to install and use anywhere. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] The utility model is further described in detail below in conjunction with the accompanying drawings and specific implementation methods.

[0026] Figure 1 A system block diagram of an embodiment of a sewage treatment device based on multi-media soil infiltration technology provided by the utility model.

[0027] The purpose, features and advantages of the present invention will be further described in conjunction with the embodiments and with reference to the accompanying drawings. DETAILED DESCRIPTION

[0028] The present invention will be further described below in conjunction with the accompanying drawings and specific implementation methods. The terms such as "upper", "lower", "left", "right", "middle" and "one" used in the preferred embodiments are only used to facilitate the description, and are not used to limit the scope of the implementation of the present invention. The changes or adjustments in their relative relationships shall also be regarded as the scope of the implementation of the present invention without substantially changing the technical content.

[0029] The MSL in the utility model refers to a multi-medium soil layer. The infiltration unit using the MLS is not only a mixed reactor including aerobic and anaerobic reaction processes, but also a micro soil ecosystem, which is a steady-state system itself.

[0030] like Figure 1 As shown, the utility model provides a sewage treatment device based on multi-media soil infiltration technology, including: a pretreatment system and a main treatment system. Domestic sewage is filtered by the pretreatment system to remove relatively large impurities and then transported to the main treatment system for further treatment, thereby achieving sewage discharge that meets standards.

[0031] The pretreatment system is provided with a solid-liquid separation device and an ABR three-compartment septic tank in sequence along the flow direction of sewage. The sewage transported by the domestic sewage drainage pipe is treated in turn by the solid-liquid separation device and the ABR three-compartment septic tank. Among them, the main structure of the solid-liquid separation device is a grid and a filter. The grid intercepts larger suspended solids, and the filter achieves solid-liquid separation through different apertures. The anaerobic baffled reactor (ABR) used in the ABR three-compartment septic tank mainly functions to achieve a certain degree of preliminary purification of sewage through solid precipitation, anaerobic fermentation and other processes. The solid-liquid separation device and the ABR three-compartment septic tank of the utility model are both conventional devices for sewage treatment, and the detailed structure and principle will not be repeated here.

[0032] The main treatment system includes a main treatment water inlet pipe, an MLS filtration unit, an MLS output pipe, a water reservoir, a water storage output pipe and a main treatment drain pipe connected in sequence. The main treatment water inlet pipe is connected to the water outlet of the pretreatment system. The main treatment water inlet pipe pumps the sewage pretreated by the pretreatment system into the main treatment system for treatment through a pump.

[0033] The MLS infiltration unit includes a housing and a soil mixed layer material filled in the housing as a filler, wherein the soil mixed layer material includes at least two of soil, sawdust, charcoal, straw, jute and iron filings, wherein the soil is at least one of biological ceramsite, zeolite and volcanic rock. In this embodiment, the MLS infiltration unit is arranged in series in three groups, and the sewage pumped to the main treatment system is treated in sequence by three MLS infiltration units. Each of the MLS infiltration units is respectively connected to an aeration pipe, and the aeration pipe is connected to an air pump, which is used to pump fresh air into the sewage in the MLS infiltration unit to increase the dissolved oxygen concentration. The pollutants in the sewage generally include: biological oxygen demand (BOD), chemical oxygen demand (COD), ammonia nitrogen (NH3-N), total nitrogen (TN) and total phosphorus (TP), etc. In order to better filter and decompose these pollutants, sufficient oxygen can be provided by aeration to promote the corresponding chemical reactions and improve the efficiency of degrading pollutants.

[0034] The output water after being treated by the MLS filtration unit is transported to the water storage tank through the MLS output pipe. In order to ensure that the treated water meets the standards, a circulation treatment method is adopted through the MLS filtration unit. Specifically, a return pipe is connected between the water storage tank and the main treatment water inlet pipe, and a circulation pump is connected to the return pipe to continue to flow back to the MLS filtration unit for repeated treatment before the water output from the water storage tank meets the standards.

[0035] In order to conduct real-time online monitoring of the system operation status and treated water quality, and to realize automatic control, the main treatment system also adopts the following settings: a control valve is connected to the MLS output pipe, a drain valve is connected between the water storage output pipe and the main treatment drain pipe, a water quality sensor is provided on the water storage output pipe, a water volume sensor is provided at the output end of the drain valve, temperature sensors are provided around the MLS filtration unit, and a liquid level sensor is provided in each MLS filtration unit; at the same time, a controller is also provided, and an air pump, a circulating pump, a control valve, a drain valve, a water quality sensor, a water volume sensor, a temperature sensor, and a liquid level sensor are all electrically connected to the controller, and the controller collects sensor signals through the water quality sensor, the water volume sensor, the temperature sensor, and the liquid level sensor, and controls the air pump, the circulating pump, the water pump, the control valve, and the drain valve according to a preset program.

[0036] In the above-mentioned automatic control part, the controller can adopt a single-chip microcomputer, a PLC module or a computer, and of course it can also be other processing devices that can realize electrical control; the control valve and the drain valve are preferably electromagnetic valves or electric valves; the water quality sensor is preferably a composite sensor for detecting the COD, ammonia nitrogen, nitrogen and phosphorus content in the water. The water quality senses the treatment result of the water. Only when the discharge standard is met can the water be drained, otherwise, the circulation pump is started to continue the treatment; the liquid level sensor is used to monitor the capacity in the MLS filtration unit. The container volume, filler type and proportion of the MLS filtration unit are all related to the sewage treatment capacity. Capacity sensing through the liquid level sensor can Real-time adjustment of sewage inflow and inflow time ensures a reasonable length of time for sewage to pass through the MLS filtration unit and provides sufficient chemical reaction, which can be achieved by adjusting the circulation pump and the water pump; the temperature sensor is used to detect the ambient temperature of the MLS filtration unit during operation. Since the activity and duration of microbial reproduction are different under different temperature conditions, temperature sensing facilitates intelligent adjustment of the film formation time of the MLS filtration unit to ensure sewage treatment under optimal conditions, so that the controller can control according to different preset modes according to different ambient temperatures; the water volume sensor is used to detect the flow rate or pressure of the outlet water.

[0037] In a specific embodiment, the sewage treatment device also includes a cabinet, the main treatment system is arranged in the cabinet, three MLS filtration units and a water reservoir are arranged in two rows and two columns in the cabinet, and the MLS filtration units and the water reservoir are respectively plastic barrels with a length, width and height of 25cm*25cm*125cm, and are connected in sequence through corresponding pipelines. A central control screen is also provided on the panel of the cabinet, and the central control screen integrates a controller and a display screen, through which the motion status and sensor data can be displayed, and control instructions can be input at the same time.

[0038] Although specific embodiments of the present invention are described above, those skilled in the art should understand that these are merely examples and that various changes or modifications may be made to the embodiments without departing from the principles and essence of the present invention. The scope of protection of the present invention is limited only by the appended claims.

Claims

1. A sewage treatment device based on multi-media soil infiltration technology, characterized in that: It includes a main treatment system, which includes a main treatment water inlet pipe, an MLS filtration unit, an MLS output pipe, a water storage tank, a water storage output pipe and a main treatment drainage pipe connected in sequence; The MLS filtration units are at least two and arranged in series, each of the MLS filtration units is connected to an aeration pipe, and the aeration pipe is connected to an air pump; A water return pipe is connected between the water storage tank and the main treatment water inlet pipe, and a circulating pump is connected in the pipeline of the water return pipe; The MLS output pipe is connected to a control valve, a drain valve is connected between the water storage output pipe and the main treatment drain pipe, a water quality sensor is provided on the water storage output pipe, a water volume sensor is provided at the output end of the drain valve, a temperature sensor is provided around the MLS filtration unit, and a liquid level sensor is provided in each of the MLS filtration units; The main processing system also includes a controller, and the vacuum pump, circulation pump, control valve, drain valve, water quality sensor, water volume sensor, temperature sensor, and liquid level sensor are all electrically connected to the controller. The controller collects sensor signals through the water quality sensor, water volume sensor, temperature sensor, and liquid level sensor and controls the vacuum pump, circulation pump, control valve, and drain valve.

2. The sewage treatment device based on multi-media soil infiltration technology according to claim 1 is characterized in that: The MLS infiltration unit includes a box body and a soil mixed layer material as a filler filled in the box body.

3. The sewage treatment device based on multi-media soil infiltration technology according to claim 2 is characterized in that: The types of soil mixing layer materials in each of the MLS infiltration units are different.

4. The sewage treatment device based on multi-media soil infiltration technology according to claim 1 is characterized in that: The water quality sensor is a composite sensor for detecting COD, ammonia nitrogen, nitrogen and phosphorus content in water.

5. The sewage treatment device based on multi-media soil infiltration technology according to claim 1 is characterized in that: The controller is a single chip microcomputer, a PLC module or a computer.

6. The sewage treatment device based on multi-media soil infiltration technology according to any one of claims 1 to 5, characterized in that: The sewage treatment device also includes a cabinet, and the main treatment system is arranged in the cabinet.

7. The sewage treatment device based on multi-media soil infiltration technology according to claim 6 is characterized in that: There are three MLS filtration units, and the three MLS filtration units and the water reservoir are horizontally distributed in two rows and two columns in the cabinet.

8. The sewage treatment device based on multi-media soil infiltration technology according to any one of claims 1 to 5, characterized in that: The sewage treatment device also includes a pretreatment system, the water inlet end of the pretreatment system is connected to the domestic sewage drainage pipe, and the water outlet end of the pretreatment system is connected to the main treatment water inlet pipe.

9. The sewage treatment device based on multi-media soil infiltration technology according to claim 8 is characterized in that: A solid-liquid separation device and an ABR type three-compartment septic tank are sequentially arranged between the water inlet and the water outlet of the pretreatment system along the sewage flow direction.

10. The sewage treatment device based on multi-media soil infiltration technology according to claim 8, characterized in that: A water pump is arranged in the pipeline of the main treatment water inlet pipe.

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