Decentralized domestic sewage quality-based low-consumption treatment process system

Abstract

This invention relates to a decentralized, low-energy-consumption wastewater treatment system, comprising a black water collection pipe, a grey water collection pipe, a black water anaerobic tank, a mixing and equalization tank, an unsaturated vertical flow wetland, and a denitrifying methane anaerobic oxidation tank. Through the integration of efficient black water and grey water separation treatment, targeted resource recovery treatment by ecological units, and denitrifying methane anaerobic oxidation treatment, the decentralized wastewater treatment system achieves the process objectives of organic matter removal and nitrogen and phosphorus removal under low energy and zero material consumption conditions. The entire system enhances the efficiency of upstream methane production through separation treatment and the design of bioconductive packing material. The generated methane is used by the downstream novel denitrification unit. The system requires no additional carbon source, has fewer electromechanical devices, a lower failure rate, and more stable operation. The system is particularly suitable for decentralized wastewater treatment scenarios, meeting the technical requirements for further reduction of energy and material consumption.

Description

Technical Field

[0001] This invention relates to the field of wastewater treatment system technology, and specifically discloses a decentralized, low-consumption domestic wastewater separation and treatment process system. Background Art

[0002] In sparsely populated rural areas and other regions, the cost of transporting and collecting domestic sewage over long distances is high, so decentralized sewage treatment models are often adopted. These decentralized, small-scale sewage treatment facilities are generally small in scale, but their overall number and distribution across the country are vast. Decentralized sewage treatment systems need to offer significant advantages in operation, management, and treatment costs to achieve widespread adoption.

[0003] Currently, most decentralized domestic wastewater treatment still involves centralized collection and end-of-pipe treatment. Compared to centralized wastewater treatment, the only difference is a smaller collection area, while the treatment process remains the same but scaled down. This model effectively reduces the construction cost of wastewater collection and transportation pipelines. However, using only a scaled-down version of traditional centralized urban wastewater treatment systems in the end-of-pipe treatment system increases operational and management complexity, raises unit wastewater treatment costs, and fails to achieve economies of scale. Traditional activated sludge processes for nitrogen and phosphorus removal require continuous treatment of excess sludge and the addition of additional carbon sources for final denitrification. Such complex and energy-intensive decentralized wastewater treatment systems are difficult to operate sustainably in the long term. The main reason is that decentralized domestic wastewater is typically collected from a mix of various sources, resulting in a low organic matter concentration for anaerobic digestion and methanogenesis, leading to low anaerobic treatment efficiency. Using aerobic treatments such as aerated biological contact oxidation would be too energy-intensive. Decentralized domestic wastewater can be classified from its source. One type is black water, which is toilet flushing wastewater with high concentrations of organic and nitrogen / phosphorus pollutants. The other type is general miscellaneous water, which is used for washing hands and kitchen cleaning and has very low pollutant concentrations. Grey water is characterized by biodegradable organic matter as its main pollutant. Black water and grey water differ significantly in properties. Black water has a high pollutant concentration but accounts for only about 30% of the water volume, while grey water has a low pollutant concentration and a large volume, accounting for about 70% of the water volume. Therefore, decentralized wastewater treatment can use separate treatment for black water and grey water. Moreover, decentralized wastewater treatment facilities are generally located near the wastewater source, facilitating source-based collection and treatment. There is an urgent need for a decentralized domestic wastewater separation and low-consumption treatment process system that can efficiently treat decentralized domestic wastewater while reducing material and energy consumption, and meeting the various technical requirements of decentralized domestic wastewater treatment. Summary of the Invention

[0004] The purpose of this invention is to overcome the shortcomings of the existing technology and provide a decentralized domestic sewage treatment process system that can efficiently treat dispersed domestic sewage while reducing material and energy consumption.

[0005] According to the technical solution provided by the present invention, the decentralized domestic sewage treatment process system includes a black water collection pipe, a grey water collection pipe, a black water anaerobic tank, a mixing and equalization tank, an unsaturated vertical flow wetland, and a denitrifying methane anaerobic oxidation tank.

[0006] The black water anaerobic tank is equipped with a vertical tank body partition, which divides the internal space of the black water anaerobic tank into two interconnected chambers. An anaerobic tank outlet pipe is installed on the side wall of the black water anaerobic tank corresponding to one of the chambers. A carbon felt packing material that is fixed vertically and suspended vertically is installed in the chamber on the same side as the anaerobic tank outlet pipe. Methanogenic microorganisms are attached to the carbon felt packing material. A methane vent pipe is installed at the top of the black water anaerobic tank, and a programmable air pump is installed at the air inlet end of the methane vent pipe.

[0007] The mixing and regulating tank is equipped with a vertical tank body partition, which divides the internal space of the mixing and regulating tank into two interconnected chambers. A programmable booster pump is installed in the middle of one of the chambers.

[0008] The unsaturated vertical flow wetland includes wetland water distribution pipes, wetland plants, substrate fillers, and wetland drainage pipes. The substrate fillers, from top to bottom, consist of a zeolite layer, a volcanic rock crushed stone layer, and a gravel layer. The particle size of the zeolite in the zeolite layer is smaller than that of the volcanic rock crushed stone in the volcanic rock crushed stone layer, and the particle size of the volcanic rock crushed stone in the volcanic rock crushed stone layer is smaller than that of the gravel in the gravel layer. Wetland plants such as fungi and grasses that can absorb nitrogen and phosphorus nutrients are planted on the zeolite layer. Wetland water distribution pipes are installed above the zeolite layer, and perforated flower-tube-style wetland drainage pipes are installed in the gravel layer.

[0009] The bottom of the denitrification anaerobic oxidation tank is equipped with an air distribution head, the middle of the denitrification anaerobic oxidation tank is filled with rigid, inverted, staggered cup packing material fixed at the top and bottom, and an overflow port is provided at the top of the denitrification anaerobic oxidation tank.

[0010] The cup-shaped packing is formed by connecting hemispherical surfaces in the same direction with fixed rods. Ring wings are provided around the periphery of the hemispherical surfaces, and denitrifying anaerobic oxidizing bacteria are attached to the hemispherical surfaces and ring wings.

[0011] The upstream of the black water collection pipe is connected to the residential black water discharge point, and the downstream of the black water collection pipe is connected to the middle of the side wall of the black water anaerobic tank on the other side of the corresponding carbon felt packing. The upstream of the grey water collection pipe is connected to the residential grey water discharge point, and the downstream of the grey water collection pipe is connected to the mixing and regulating tank on the other side of the corresponding programmable booster pump. The gas outlet of the methane gas outlet pipe is connected to the gas inlet of the gas distribution head. The anaerobic tank outlet pipe is connected to the mixing and regulating tank on the other side of the corresponding programmable booster pump. The water inlet of the wetland water distribution pipe is connected to the water outlet of the programmable booster pump. The water outlet of the wetland drainage pipe extends into the bottom of the denitrification methane anaerobic oxidation tank.

[0012] Preferably, the thickness of the zeolite layer is 200-500 mm, and the particle size of the zeolite in the zeolite layer is 5-10 mm.

[0013] Preferably, the thickness of the volcanic rock fragment layer is 200-500 mm, and the particle size of the volcanic rock fragments in the volcanic rock fragment layer is 10-20 mm.

[0014] Preferably, the thickness of the gravel layer is 100-400 mm, and the particle size of the gravel in the gravel layer is 20-50 mm.

[0015] Preferably, a vertical tank partition is provided in the middle of the interior of the black water anaerobic tank.

[0016] The present invention has the following advantages:

[0017] 1. The decentralized, low-consumption domestic sewage treatment system of the present invention separately treats black water and grey water of different properties from decentralized residential domestic sewage in a nearby manner. The separate collection and treatment of black water with small volume and high pollutant concentration, followed by sufficient anaerobic digestion with adequate retention time, significantly reduces the required reaction tank volume, resulting in lower construction costs and higher efficiency for the anaerobic treatment unit.

[0018] 2. The decentralized domestic sewage treatment process system of the present invention fills the anaerobic tank with carbon felt strip microbial conductive packing material that improves the interspecies electron transfer efficiency, thereby effectively improving the methanogenic efficiency of black water anaerobic digestion and reducing the concentration of organic matter in the treated black water. This reduces the organic load of the subsequent aerobic sewage treatment and saves the energy consumption of aeration and oxygenation in aerobic treatment.

[0019] 3. The decentralized domestic sewage treatment system of the present invention, which is characterized by low energy consumption and high quality, mixes grey water containing only low concentrations of organic matter with black water that has undergone sufficient anaerobic digestion and then treats it with an unsaturated vertical flow constructed wetland. This process can achieve the removal of organic matter and nitrification of ammonia nitrogen during the low-energy ecological treatment process. Simultaneously, the use of wetland substrate with phosphorus absorption function can achieve effective phosphorus fixation and resource utilization of phosphorus by wetland plants.

[0020] 4. The decentralized domestic sewage treatment process system of the present invention includes a denitrifying anaerobic oxidation tank in the final stage. The methane produced by the anaerobic digestion of black water in the previous stage is introduced into the tank. By inoculating denitrifying anaerobic oxidation bacteria, the denitrification biochemical process is carried out without the addition of additional carbon sources. The methane produced in the front end is utilized in a resource-efficient manner, eliminating the need for additional carbon sources for denitrification and achieving the goal of low material consumption for denitrification.

[0021] 5. The decentralized domestic sewage treatment process system of the present invention has only two low-energy-consumption devices in the entire treatment process: a programmable air pump that periodically delivers a small amount of methane and a programmable water pump that periodically lifts sewage for distribution. It has fewer electromechanical devices, a lower failure rate, and more stable operation.

[0022] 6. The decentralized domestic sewage treatment process system of the present invention achieves the process objectives of organic matter removal and nitrogen and phosphorus removal under low energy consumption and zero material consumption by integrating technologies such as efficient treatment of black water and ash water, targeted resource utilization treatment of ecological units and anaerobic oxidation treatment of denitrification methane. Attached Figure Description

[0023] Figure 1 This is a schematic diagram of the system composition of the present invention.

[0024] Figure 2 This is a schematic diagram of the black water anaerobic tank in this invention.

[0025] Figure 3 This is a schematic diagram of the mixing and regulating tank in this invention.

[0026] Figure 4 This is a schematic diagram of the unsaturated vertical flow wetland structure in this invention.

[0027] Figure 5 This is a schematic diagram of the denitrifying methane anaerobic oxidation tank in this invention.

[0028] Figure 6 This is a schematic diagram of the cup-shaped packing structure in this invention. Detailed Implementation

[0029] The present invention will be further described below with reference to specific embodiments.

[0030] like Figure 1 As shown, the decentralized domestic sewage treatment system with low energy consumption provided by the present invention includes a black water collection pipe 1, a grey water collection pipe 2, a black water anaerobic tank 3, a mixing and equalization tank 4, an unsaturated vertical flow wetland 5, and a denitrifying methane anaerobic oxidation tank 6.

[0031] like Figure 2As shown, the black water anaerobic tank 3 is provided with a vertical tank body partition 31 inside. The internal space of the black water anaerobic tank 3 is divided into two compartments that are connected vertically by the tank body partition 31. An anaerobic tank outlet pipe 35 is provided on the side wall of the black water anaerobic tank 3 corresponding to one of the compartments. A carbon felt strip packing 32 is provided in the compartment on the same side as the anaerobic tank outlet pipe 35. Methanogenic microorganisms are attached to the carbon felt strip packing 32. A methane vent pipe 34 is provided at the top of the black water anaerobic tank 3. A programmable air pump 33 is provided at the air inlet end of the methane vent pipe 34.

[0032] like Figure 3 As shown, the mixing and regulating tank 4 is provided with a vertical tank body partition 42. The internal space of the mixing and regulating tank 4 is divided into two compartments that are connected vertically by the tank body partition 42. A programmable booster pump 41 is provided in the middle of one of the compartments.

[0033] like Figure 4 As shown, the unsaturated vertical flow wetland 5 includes a wetland water distribution pipe 51, wetland plants 52, substrate filler, and wetland drainage pipe 56. The substrate filler consists of a zeolite layer 53, a volcanic rock crushed stone layer 54, and a gravel layer 55 from top to bottom. The particle size of the zeolite in the zeolite layer 53 is smaller than that of the volcanic rock crushed stone in the volcanic rock crushed stone layer 54, and the particle size of the volcanic rock crushed stone in the volcanic rock crushed stone layer 54 is smaller than that of the gravel in the gravel layer 55. Wetland plants 52, which can absorb nitrogen and phosphorus nutrients, are planted on the zeolite layer 53. The wetland water distribution pipe 51 is installed above the zeolite layer 53, and the perforated flower-shaped wetland drainage pipe 56 is installed in the gravel layer 55.

[0034] like Figure 5 As shown, the bottom of the denitrifying anaerobic oxidation tank 6 is provided with an air distribution head 61, the middle of the denitrifying anaerobic oxidation tank 6 is filled with rigid, inverted, staggered cup packing 62 fixed at the top and bottom, and an overflow port 63 is provided at the top of the denitrifying anaerobic oxidation tank 6.

[0035] like Figure 6 As shown, the cup-shaped packing 62 is formed by connecting hemispherical surfaces 622 in the same direction with fixed rods 621. Ring wings 623 are provided around the hemispherical surfaces 622. Denitrifying anaerobic oxidizing bacteria are attached to the hemispherical surfaces 622 and the ring wings 623.

[0036] The upstream of the black water collection pipe 1 is connected to the residential black water discharge point, and the downstream of the black water collection pipe 1 is connected to the middle of the side wall of the black water anaerobic tank 3 on the other side of the corresponding carbon felt packing 32; the upstream of the grey water collection pipe 2 is connected to the residential grey water discharge point, and the downstream of the grey water collection pipe 2 is connected to the mixing and regulating tank 4 on the other side of the corresponding programmable booster pump 41; the gas outlet end of the methane gas outlet pipe 34 is connected to the gas inlet end of the gas distribution head 61; the anaerobic tank outlet pipe 35 is connected to the mixing and regulating tank 4 on the other side of the corresponding programmable booster pump 41; the water inlet end of the wetland water distribution pipe 51 is connected to the water outlet end of the programmable booster pump 41; the water outlet end of the wetland drainage pipe 56 extends into the bottom of the denitrification methane anaerobic oxidation tank 6.

[0037] The thickness of the zeolite layer 53 is 200-500 mm, and the particle size of the zeolite in the zeolite layer 53 is 5-10 mm.

[0038] The thickness of the volcanic rock fragment layer 54 is 200-500 mm, and the particle size of the volcanic rock fragments in the volcanic rock fragment layer 54 is 10-20 mm.

[0039] The thickness of the gravel layer 55 is 100-400 mm, and the particle size of the gravel in the gravel layer 55 is 20-50 mm.

[0040] A vertical tank partition 31 is installed in the middle of the interior of the black water anaerobic tank 3.

[0041] In the decentralized, low-consumption domestic sewage treatment system of this invention, domestic sewage, including black water containing fecal matter, is first generated from decentralized residences. This black water enters one compartment of the black water anaerobic tank 3, separated by a tank partition 31, through a black water collection pipe 1. Upon entering the anaerobic tank 3, the black water undergoes natural sedimentation and flotation within this compartment, with scum rising to the top and sediment settling. The clean water then flows through a bottom connection into the other compartment of the anaerobic tank 3. The carbon felt packing material 32 in this other compartment contains a large number of methanogenic microorganisms. The organic matter in the black water is decomposed, producing methane which is released into the top space of the anaerobic tank 3 and accumulates. The carbon felt packing material 32 is conductive, and the methanogenic microorganisms attached to it enhance interspecies electron transfer efficiency with the aid of the carbon felt packing material 32, thereby increasing methanogenesis efficiency. Furthermore, since the blackwater anaerobic tank 3 only collects blackwater from domestic sewage, the organic matter concentration in the sewage in the blackwater anaerobic tank 3 will be high. Compared with general devices that collect blackwater and greywater together, the blackwater anaerobic tank 3 is in an environment with a high concentration of organic matter, resulting in higher methanogenesis efficiency and organic matter removal efficiency. Therefore, organic matter can be efficiently removed from the blackwater in the blackwater anaerobic tank 3. Because the volume of blackwater accounts for a small proportion of all domestic sewage, the blackwater anaerobic tank can achieve a retention time of 15-30 days to ensure anaerobic treatment efficiency without requiring an excessively large storage volume, thus significantly reducing the construction cost of the blackwater anaerobic tank 3. The sewage with low organic matter content treated by the blackwater anaerobic tank 3 enters the mixing and equalization tank 4 through the anaerobic tank outlet pipe 35. The mixing and equalization tank 4 is divided into two interconnected chambers by a tank body partition 42. One chamber is connected downstream to the anaerobic tank outlet pipe 35 and the greywater collection pipe 2. The treated black water and newly entering grey water undergo flotation, sedimentation, and mixing in one chamber of the mixing and equalization tank 4. Then, they enter the other side of the mixing and equalization tank 4 through a bottom connection. A programmable booster pump 41, located in the middle of the other side, lifts the wastewater and distributes it onto the upper surface of the zeolite layer 53 via a wetland distribution pipe 51. At this point, the wastewater entering the upper surface of the zeolite layer 53 has a low concentration of organic matter but contains ammonia nitrogen and phosphate. Wetland plants 52, which absorb nitrogen and phosphorus nutrients, can directly absorb some of the ammonia nitrogen and phosphate. Furthermore, the surface of the zeolite layer 53, exposed to the atmosphere, can accumulate heterotrophic bacteria to consume and remove organic matter. Simultaneously, the zeolite can rapidly adsorb ammonia nitrogen from the wastewater and, under the action of nitrifying bacteria, nitrify the ammonia nitrogen to generate nitrate. At this stage, nitrogen is not effectively removed, but only converted into nitrate. The wastewater continues to infiltrate into the unsaturated vertical flow wetland 5, where phosphate is rapidly adsorbed and removed as it passes through the volcanic rock gravel layer 54. The adsorption of phosphates by volcanic rock fragments is a weakly bound adsorption, and the adsorbed phosphates can be absorbed and reused by plants. Continuously planting nitrogen and phosphorus-absorbing plants can delay the adsorption saturation of the wetland substrate and extend the life of the wetland. The rapid adsorption of the wetland substrate can effectively cope with load shocks.The lowest layer of the wetland is a gravel layer 55, within which perforated wetland drainage pipes 56 are installed. Wastewater collected in these pipes flows into the bottom of the denitrifying anaerobic oxidation tank 6. After passing through the unsaturated vertical flow wetland 5, organic matter is further removed, phosphates are effectively removed, and ammonia nitrogen is effectively converted to nitrate nitrogen. The programmable booster pump 41 distributes water to the upper surface of the unsaturated vertical flow wetland 5 according to the wetland's pollutant removal characteristics, setting reasonable and efficient wastewater boosting and intermittent cycles to ensure the removal of organic matter and phosphates, as well as the nitrification of ammonia nitrogen, ensuring that the wastewater entering the bottom of the denitrifying anaerobic oxidation tank 6 is only rich in nitrates. At this point, the denitrifying anaerobic oxidation tank 6 needs to be pre-inoculated with denitrifying anaerobic bacteria, ensuring that the hemispherical surfaces 622 and the ring flanges 623 of the cover packing 62 are covered with denitrifying anaerobic bacteria. A methane outlet pipe 34 is installed at the top of the black water anaerobic tank 3. Under the action of a programmable air pump 33, the enriched methane gas is pumped to the gas distribution head 61 at the bottom of the denitrification methane anaerobic oxidation tank 6. The gas distribution head 61 disperses and releases the methane gas into the packing area in the denitrification methane anaerobic oxidation tank 6. The packing area is filled with rigid, inverted, and staggered cup packing 62 fixed at the top and bottom. The fixing rods 621 on the cup packing 62 fix the hemispheres 622 in the same direction and connect them in series. The opening of the hemispheres 622 of the cup packing is downward. The methane gas released upward through the gas distribution head 61 floats upward between the staggered cup packing 62 and is captured by the hemispheres 622 on the cup packing 62. It stays in the spherical surface of the hemisphere 622 to form a methane gas chamber. Because the cup packing 62 is staggered, the methane gas will be discharged from the bottom to the top of the water in the hemispheres 622 of each string of packing during the rising process, forming a gas chamber. Because the annular fins 623 surrounding the hemispherical surface 622 can harbor a large number of denitrifying anaerobic bacteria, the methane gas chamber formed inside the hemispherical surface 622 can slowly dissolve and diffuse, providing the denitrifying anaerobic bacteria on the annular fins 623 with the opportunity to reduce nitrates. This achieves denitrification without adding a carbon source, utilizing the methane produced at the front end for denitrification. The programmable air pump 33 is programmed to supply and exchange air to the denitrifying anaerobic oxidation tank 6 in an orderly and quantitative manner based on methane consumption, ensuring efficient denitrification. Finally, the nitrogen produced by denitrification and the treated effluent are discharged through the overflow port 63. The implementation process mainly achieves organic matter removal and nitrogen and phosphorus removal through the synergistic effect of various unit processes in the process system. The entire process system enhances the efficiency of methane production in the front end through differentiated treatment and the design of biological conductive packing. The generated methane is used by the new denitrification unit in the back end. The system does not require additional carbon source, has fewer electromechanical devices throughout the process, a lower failure rate, and more stable operation. The process system is particularly suitable for decentralized domestic wastewater treatment scenarios, meeting the technical requirements for further reduction of energy and material consumption.

[0042] This invention provides for the separate treatment of blackwater and greywater from decentralized residential wastewater, which differ in their properties. Separate collection and treatment of blackwater with low volume and high pollutant concentration significantly reduces the required reactor volume for sufficient anaerobic digestion with adequate retention time, resulting in lower treatment costs. Simultaneously, by filling the anaerobic treatment unit with conductive microbial packing material that enhances interspecies electron transfer efficiency, the methanogenic efficiency of blackwater anaerobic digestion is effectively improved, reducing the organic matter concentration in the treated blackwater and thus decreasing the organic load on subsequent aerobic wastewater treatment, thereby reducing energy consumption. Greywater with high volume and low organic matter concentration is mixed with the fully anaerobic blackwater and treated using an unsaturated vertical flow constructed wetland. This achieves organic matter removal and ammonia nitrification during low-energy ecological treatment. Simultaneously, the use of a wetland substrate with phosphorus uptake capacity enables effective phosphorus retention and resource utilization by wetland plants. Wastewater treated by the unsaturated vertical flow constructed wetland is generally rich in nitrates and requires denitrification. The final stage of the process system includes a denitrifying anaerobic oxidation tank for methane. Methane produced from the anaerobic digestion of black water in the preceding stage is introduced into this tank. By inoculating denitrifying anaerobic bacteria, a denitrification biological process is carried out without the addition of an additional carbon source. This process utilizes the methane produced at the upstream stage, achieving low-material-consumption nitrogen removal. Through efficient black water and ash water separation treatment, targeted resource recovery treatment in ecological units, and denitrifying anaerobic oxidation treatment, the process system enables decentralized domestic wastewater treatment to achieve low-energy and low-material-consumption removal of organic matter, nitrogen, and phosphorus.

[0043] Finally, it should be noted that the above specific embodiments are only used to illustrate the technical solutions of the present invention and not to limit it. Although the present invention has been described in detail with reference to examples, those skilled in the art should understand that modifications or equivalent substitutions can be made to the technical solutions of the present invention without departing from the spirit and scope of the technical solutions of the present invention, and all such modifications or substitutions should be covered within the scope of the claims of the present invention.

Claims

1. A decentralized, low-consumption wastewater treatment process system, characterized in that: It includes a black water collection pipe (1), a grey water collection pipe (2), a black water anaerobic tank (3), a mixing and regulating tank (4), an unsaturated vertical flow wetland (5), and a denitrifying methane anaerobic oxidation tank (6). The black water anaerobic tank (3) is equipped with a vertical tank body partition (31). The internal space of the black water anaerobic tank (3) is divided into two chambers that are connected vertically by the tank body partition (31). An anaerobic tank outlet pipe (35) is provided on the side wall of the black water anaerobic tank (3) corresponding to one of the chambers. A carbon felt strip packing (32) is fixed vertically and suspended vertically in the chamber on the same side as the anaerobic tank outlet pipe (35). Methanogenic microorganisms are attached to the carbon felt strip packing (32). A methane gas outlet pipe (34) is provided on the top of the black water anaerobic tank (3). A programmable air pump (33) is provided on the air inlet end of the methane gas outlet pipe (34). The mixing and regulating tank (4) is provided with a vertical tank body partition (42). The internal space of the mixing and regulating tank (4) is divided into two compartments that are connected vertically by the tank body partition (42). A programmable booster pump (41) is provided in the middle of one of the compartments. The unsaturated vertical flow wetland (5) includes a wetland water distribution pipe (51), wetland plants (52), substrate filler and wetland drainage pipe (56); the substrate filler consists of a zeolite layer (53), a volcanic rock crushed stone layer (54) and a gravel layer (55) from top to bottom. The particle size of the zeolite in the zeolite layer (53) is smaller than that of the volcanic rock crushed stone in the volcanic rock crushed stone layer (54), and the particle size of the volcanic rock crushed stone in the volcanic rock crushed stone layer (54) is smaller than that of the gravel in the gravel layer (55); wetland plants (52) that can absorb nitrogen and phosphorus nutrients are planted on the zeolite layer (53), a wetland water distribution pipe (51) is set above the zeolite layer (53), and a perforated flower-shaped wetland drainage pipe (56) is set in the gravel layer (55). The bottom of the denitrification anaerobic oxidation tank (6) is provided with an air distribution head (61), the middle of the denitrification anaerobic oxidation tank (6) is filled with rigid, inverted, staggered cup packing material (62) fixed at the top and bottom, and an overflow port (63) is provided at the top of the denitrification anaerobic oxidation tank (6). The cup-shaped packing (62) is formed by connecting the hemisphere (622) in the same direction with a fixed rod (621). A ring wing (623) is provided around the hemisphere (622). Denitrifying anaerobic oxidizing bacteria are attached to the hemisphere (622) and the ring wing (623). The upstream of the black water collection pipe (1) is connected to the residential black water discharge point, and the downstream of the black water collection pipe (1) is connected to the middle of the side wall of the black water anaerobic tank (3) on the other side of the corresponding carbon felt packing (32); the upstream of the grey water collection pipe (2) is connected to the residential grey water discharge point, and the downstream of the grey water collection pipe (2) is connected to the mixing and regulating tank (4) on the other side of the corresponding programmable booster pump (41); the gas outlet of the methane gas outlet pipe (34) is connected to the gas inlet of the gas distribution head (61); the anaerobic tank water outlet pipe (35) is connected to the mixing and regulating tank (4) on the other side of the corresponding programmable booster pump (41); the water inlet of the wetland water distribution pipe (51) is connected to the water outlet of the programmable booster pump (41); the water outlet of the wetland drainage pipe (56) extends into the bottom of the denitrification methane anaerobic oxidation tank (6).

2. The decentralized, low-consumption domestic sewage treatment process system as described in claim 1, characterized in that: The thickness of the zeolite layer (53) is 200-500 mm, and the particle size of the zeolite in the zeolite layer (53) is 5-10 mm.

3. The decentralized, low-consumption domestic sewage treatment process system as described in claim 1, characterized in that: The thickness of the volcanic rock fragment layer (54) is 200-500 mm, and the particle size of the volcanic rock fragments in the volcanic rock fragment layer (54) is 10-20 mm.

4. The decentralized, low-consumption domestic sewage treatment process system as described in claim 1, characterized in that: The thickness of the gravel layer (55) is 100-400 mm, and the particle size of the gravel in the gravel layer (55) is 20-50 mm.

5. The decentralized, low-consumption domestic sewage treatment process system as described in claim 1, characterized in that: A vertical tank partition (31) is installed in the middle of the interior of the black water anaerobic tank (3).

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