CN101525204A - Method for treating village sewage and specific device thereof - Google Patents

Abstract

The invention discloses a rural sewage treatment method and its special device. The special device includes a submersible sewage pump and a multifunctional baffle treatment module connected thereto. The multifunctional baffle treatment module sequentially includes No. 1-3 There are three anaerobic units in the pool, two aerobic units in the No. 4-5 pool and one sedimentation unit in the No. 6 pool. They are connected by pipelines; the anaerobic units are equipped with exhaust holes, and the aerobic units are equipped with suspended air vents. The upper and lower steel wire meshes, the compartments between the steel meshes are filled with fillers, and the lower steel meshes are provided with air distribution holes connected with the aerator. The specific operation steps of the method are detailed in the instructions. The method and the special device of the present invention comprehensively use physical treatment technologies such as sedimentation and filtration and biochemical treatment technologies such as anaerobic oxidation and aerobic oxidation, so that organic matter in sewage can be degraded, inorganic salts can be fixed, and nutrients such as nitrogen and phosphorus can be degraded. It can be reduced, has the advantages of large hydraulic load and good water quality after treatment, and is especially suitable for my country's national conditions.

Description

A rural sewage treatment method and its special device

technical field

The invention relates to a sewage treatment device and method, in particular to a rural sewage treatment method and a special device thereof, specifically adopting a multifunctional baffle combined biological filter treatment method.

Background technique

For a long time, the problem of random discharge of domestic drainage, domestic garbage and agricultural waste in vast rural areas has not attracted fundamental attention. Most of the wastes such as human and animal manure, domestic garbage and domestic drainage have not been treated, and they are randomly piled on both sides of the road and beside the fields. Fields, ponds, ditches or directly discharged into water bodies such as rivers and canals, making "sewage splashing, garbage dumping, excrement piles, firewood stomping, livestock and poultry running around", "indoor modernization, outdoor dirty and messy" have become some A true portrayal of the rural ecological environment. According to statistics, at present, 96% of villages in my country do not have drainage channels and sewage treatment systems, and the random discharge of production and domestic sewage has become a potential safety hazard in rural water sources and an important restrictive factor for the harmonious development of a new socialist countryside. Untreated rural domestic sewage, on the one hand, is a potential safety hazard in rural drinking water sources; on the other hand, it contains more nitrogen and phosphorus, which is also one of the important reasons for the eutrophication of rivers and lakes. Therefore, strengthening the construction of rural domestic drainage collection, treatment and resource utilization facilities, avoiding the pollution of rural water bodies, soil and agricultural products caused by the direct discharge of domestic sewage, and ensuring the safety of rural water sources and the health of farmers are not only the strengthening of infrastructure construction in the construction of new countryside It is an important content to promote village renovation work, and it is also the most urgent, urgent and prominent problem that needs to be solved in the improvement of rural human settlements, and it has important practical significance.

However, the large-scale centralized treatment methods currently adopted in my country's urban domestic sewage are not suitable for popularization and application in rural areas. The main performance is that large-scale centralized treatment plants require large engineering costs to establish complex drainage pipe networks. In areas with very low population densities, this investment will be an order of magnitude higher than the total investment in a sewage treatment plant. Especially in rural areas, where the settlements are more dispersed, this cost will be higher. Additionally, plumbing repairs can be very expensive. Sewage ecological treatment technology has been widely valued at home and abroad because of its low engineering cost, low operating cost, easy access to infrastructure materials, simple operation, and good treatment effect. Many countries, including the United States, Japan, Britain, France, Russia, etc. This technology is widely used to treat domestic drainage. During the "Seventh Five-Year Plan", "Eighth Five-Year Plan", "Ninth Five-Year Plan" and "Tenth Five-Year Plan" in our country, many domestic scientific research institutions have carried out a large number of non-electric anaerobic and ecological technologies to treat small town domestic drainage, community domestic drainage and The experimental research and engineering demonstration of industrial drainage have obtained a number of different types of practical technologies for ecological treatment with independent intellectual property rights. These units successively carried out the feasibility of treating urban domestic drainage with a series of ecological technologies such as artificial wetland, capillary infiltration and rapid infiltration under the condition of primary media, obtained a series of important parameters, and carried out research in different areas such as Jiaxing, Shenyang, Shenzhen and Panjin. engineering demonstration. However, rural domestic drainage is characterized by dispersal, small volume, far away from groups and large water bodies, small water environment capacity, and low management level. If these technologies are applied to rural domestic drainage treatment, there are still problems such as low pollutant removal flux and year-round operation. Unstable, easy clogging of matrix filter material, poor phosphorus and nitrogen removal efficiency, high operating costs or waste of land resources and other technical constraints.

Contents of the invention

The purpose of the present invention is to address the above-mentioned defects in the prior art, and to provide a rural sewage treatment method and a special device thereof. Biochemical treatment technology degrades organic matter in sewage, fixes inorganic salts, and reduces nutrients such as nitrogen and phosphorus. It has the advantages of large hydraulic load and good water quality after treatment, and is especially suitable for my country's national conditions.

In order to achieve the above object, the technical solution adopted by the present invention is: a special device for rural sewage treatment, including a submersible sewage pump and a multifunctional baffle treatment module connected to it, and the multifunctional baffle treatment module includes sequentially according to the sewage flow direction There are six pools, which are three anaerobic units, two aerobic units and one sedimentation unit, and the adjacent treatment units are connected by pipeline segments; among them, No. 1 pool, No. 2 pool and No. 3 pool are anaerobic units and Each unit is equipped with an exhaust hole, the submersible sewage pump is connected to No. 1 pool, and a three-phase distributor is installed in No. 3 pool; No. 4 pool and No. 5 pool are aerobic units, and the pools are equipped with suspended upper and lower steel wire mesh , the upper and lower wire meshes form compartments, and the compartments are filled with fillers for aerobic reactions. The lower steel wire mesh is provided with air distribution holes, which are connected to the aerator through air distribution pipes; the No. 6 pool is a sedimentation unit. The multi-functional baffle treatment module integrates the functions of septic tank, anaerobic treatment, aerobic treatment, biological floating bed, sedimentation, etc., and the organic matter in the sewage is converted into harmless substance.

In order to perform advanced treatment on the water quality of the effluent, the special device for rural sewage treatment also includes a multi-media ecological infiltration module connected to the outlet of the multi-functional baffle treatment module through a pipeline, and the multi-media ecological infiltration module contains A filter with a multi-media filter layer. As the advanced treatment unit of the multi-functional baffle treatment module, the multi-media ecological infiltration module can further remove total nitrogen, total phosphorus, suspended solids and COD (Chemical Oxygen Demand) in the sewage, so that the effluent quality meets the "urban Discharge Standard of Pollutants for Sewage Treatment Plants (GB18918-2002) Secondary Standard.

In the special device for rural sewage treatment, the upper part of the multi-media ecological infiltration module is an aeration material, specifically a macroporous mesh carrier; the lower part of the filler is composed of at least 4 layers. The bottom of each layer of packing is a water-permeable filter layer, and the top is a multi-media filter material layer; among them, the multi-media filter material layer on the top of each layer is alternately filled with multimedia filter material and water-permeable filter material, which forms the shape of "product" filling. As a preference, the filler of the multi-media filter material layer is a multi-media filter material, which is mainly artificially synthesized functional ceramsite, supplemented by modified zeolite with a particle size greater than 2mm, and functional ceramsite and modified zeolite with a particle size greater than 2mm. The filling ratio range of the non-toxic zeolite is 1:10 to 5:1 by volume. The filler of the permeable filter layer is a permeable filter material, which is composed of gravel with a particle size of 3-40mm and modified zeolite with a particle size larger than 2mm. The filling ratio of gravel with an average particle size of 10mm to modified zeolite with a particle size larger than 2mm The volume ratio is 10:1 to 1:1.

In order to prolong the treatment time of sewage, the pipes connected between the units are baffle pipes.

In order to facilitate the discharge of sludge, the unit is provided with a sludge discharge hole near the bottom.

In order to prevent the blockage of the bioreactor and further improve the denitrification efficiency of the activated sludge, the filler is a macroporous polyurethane filler.

In order to disperse the impact of the water flow and further settle the sludge in the sewage, the baffle pipe extending into the No. 6 pool is a water diversion pipe, and the port of the water diversion pipe is trumpet-shaped.

The present invention also includes a method, which is a rural sewage treatment method according to the special device for rural sewage treatment, which specifically includes the following steps:

Step A Transport the sewage to the No. 1 pool, and carry out septic and water quality treatment through the anaerobic oxidation pool of the No. 1 pool;

Step B The sewage treated in No. 1 pool enters the anaerobic oxidation pool of No. 2 pool through the pipeline for anaerobic treatment;

Step C The sewage treated in the No. 2 pool enters the anaerobic oxidation pool of the No. 3 pool through the pipeline, and the water, sludge and gas are separated under the action of the three-phase distributor in the No. 3 pool, and the water enters the No. 4 pool through the pipeline. The sludge settles to the bottom of the tank, and the gas is discharged through the exhaust port;

Step D The sewage treated in the No. 3 pool enters the aerobic oxidation pool of the No. 4 pool through the pipeline, and aerates the No. 4 pool for aerobic oxidation treatment;

Step E The sewage enters the aerobic oxidation pool of No. 5 pool through the pipeline, and repeats the above step D;

Step F The sewage treated in the No. 5 pool enters the No. 6 pool for sedimentation, further sediments the suspended solids of the sewage, and finally discharges the treated water that meets the standard requirements.

The method integrates the functions of septic tank, anaerobic treatment, aerobic treatment, biological floating bed, sedimentation, etc., so that the organic matters in the sewage can be transformed into harmless substances under the action of anaerobic and aerobic microorganisms.

The rural sewage treatment method also includes the operation process of the multi-media ecological infiltration module. Specifically, the sewage passes through the water distribution pipes on the surface of the filter tank filler step by step through the "product" composed of a multi-media filter material layer and a water-permeable filter layer. The zigzag filter material layer enters the sump at the bottom of the filter and is discharged. When the sewage flows through the multi-media ecological filter through the multi-functional baffle treatment module, the pollutants are intercepted and adsorbed on the surface of the multi-media filter material, and the microorganisms use the organic matter to grow and reproduce, and attach to the filter material to form a biofilm. After a period of time, the biofilm matures, and the microorganisms inhabiting the biofilm use the organic matter flowing through the surface as nutrients to adsorb, decompose and oxidize the organic matter in the sewage, thereby purifying the sewage flowing through the ecological filter.

The rural sewage treatment method, wherein the aeration in the steps D and E adopts intermittent aeration. The intermittent aeration method that is beneficial to denitrification and denitrification is adopted, and the aeration rate is only 1/3 to 1/5 of that of ordinary activated sludge and fixed bed reactors.

Beneficial effects of the present invention can be summarized as following five aspects:

①Compared with the prior art, the multi-functional baffle treatment module in the rural sewage treatment special device of the present invention is used as a pretreatment device of the multi-media ecological percolation module, which has the characteristics of strong ability to remove organic matter, and effectively solves the problem of sewage caused by The high concentration of organic matter causes a large number of anaerobic microorganisms in the inner layer of the biofilm in the multi-media ecological filter to produce anaerobic micro-decomposition products, thereby affecting the water quality of the effluent. The smaller the pores, the worse the ventilation of the filter, affecting the entry of oxygen, and even causing the problem of filter blockage.

②Compared with the prior art, the multi-media ecological infiltration module in the special device for rural sewage treatment according to the present invention is used as an advanced treatment unit of the multifunctional baffle treatment module, which can further remove total nitrogen, total phosphorus, and suspended solids in sewage and COD, making the effluent quality meet the secondary standard of the Discharge Standard of Pollutants for Urban Sewage Treatment Plants (GB18918-2002).

③Compared with the prior art, the multifunctional baffle treatment module in the rural sewage treatment special device of the present invention has the functions of septic tank, anaerobic suspension, biological floating bed and sedimentation tank at the same time, integrating anaerobic and aerobic processes into one Integrated, it has the characteristics of small footprint, low infrastructure investment, low (or none) operating costs, not easy to block, convenient management, no potential ecological safety hazards, and can be operated all year round.

④Compared with the prior art, the multi-media ecological infiltration module in the rural sewage treatment special device of the present invention adopts the "pin"-shaped packing method to achieve a balance point that can ensure both the flow rate and the residence time. The multi-media filter layer in the multi-media ecological filter is the water purification medium, and the permeable filter layer is the water flow channel. The function differentiation of the water purification medium and the water flow channel can increase the reaction time of pollutants and effectively prevent the multi-media ecological seepage. Blockage of the filter module.

5. Compared with the prior art, the rural sewage treatment method of the present invention integrates sewage treatment technologies such as physical treatment method, anaerobic treatment method, activated sludge method and biofilm method, so that the organic matter in the sewage can be degraded, and the inorganic salt It can be fixed, nutrients such as nitrogen and phosphorus can be reduced, and has the advantages of large hydraulic load and good water quality after treatment, which is especially suitable for my country's national conditions.

Description of drawings

Fig. 1 is the plane layout drawing of the rural sewage treatment special device of the present invention;

Fig. 2 is a sectional view along line A-A in Fig. 1;

Fig. 3 is a sectional view along line B-B in Fig. 1;

Fig. 4 is a sectional view along line C-C in Fig. 1 .

1 Submersible sewage pump, 2 Sewage pipe, 3 Water inlet direction, 4 Exhaust hole, 5 Exhaust pipe, 6 Inlet pipe, 7 Aerator, 8 Water outlet direction, 9 Water outlet of multi-functional baffle treatment module, 10 Sludge Discharge main pipe, 11 sludge discharge branch pipe, 12 sludge discharge gate valve, No. 131 pool, No. 142 pool, No. 153 pool, No. 164 pool, No. 175 pool, No. 186 pool, 19 water delivery pipe, 20 water distribution pipe, 21 multi-media ecology Water outlet of filter treatment device, 22 water inlet gate valve, 23 check valve, 24 diversion pipe, 25 mud discharge hole, 26 three-phase distributor, 27 steel wire mesh, 28 air distribution pipe, 29 polyurethane packing, 30 air distribution hole, 31 Steel mesh bracket, 32 conical iron sheet, 33 water distribution pipe bracket, 34 water distribution pipe, 35 water collection tank, 36 permeable filter layer, 37 multi-media filter layer, 39 aeration material.

Detailed ways

The present invention will be further described below in conjunction with the accompanying drawings and specific embodiments, but not as a limitation of the present invention.

As shown in Figures 1-4, the special device for rural sewage treatment according to the present invention, as the best embodiment, includes a multi-functional baffle treatment module and a multi-media ecological percolation unit. Its design standard load: 24m ³ /d; design maximum load: 48m ³ /d; effluent water quality: COD (Chemical Oxygen Demand) ≤ 100mg/L, TSS (suspended solids) ≤ 30mg/L, BOD (Biochemical Oxygen Demand (biochemical oxygen demand) ≤ 30mg/L, NH ₃ -N (ammonia nitrogen) ≤ 25(30) mg/L, total phosphorus ≤ 3mg/L, that is, meet the "Urban Sewage Treatment Plant Pollutant Discharge Standard" (GB18918- 2002) secondary standard.

In this example, the main part of the multi-functional baffle treatment module is cylindrical and consists of 6 pools of equal size, including No. 1 pool 13 and No. 2 pool 14 according to the sewage flow direction from the water inlet direction 3 to the water outlet direction 8 1, No. 3 pool 15 three anaerobic units, No. 4 pool 16, No. 5 pool 17 two aerobic units and No. 6 pool 18 a settling tank unit. Its overall outline size is length x width x height: 7.15m x 2.4m x 2.4m. Adjacent units are connected by pipe segments. In this example, in order to prolong the treatment time of sewage, the pipeline adopts a baffle tube 24 .

Wherein, the working process of the multifunctional baffle processing module is roughly divided into the following three stages.

The first stage, anaerobic treatment:

As shown in Figure 1-2, the submersible sewage pump 1 is connected to No. 1 pool 13 through the check valve 23 and the water inlet valve 22 through the sewage pipe 2. The diversion enters the No. 2 pool 14, and the No. 2 pool 14 is an anaerobic oxidation pool. After passing through the No. 2 pool 14, the diversion enters the No. 3 pool 15 through the baffle tube 24, and the No. 3 pool 15 is an anaerobic oxidation pool. The three-phase distributor 26 in the No. 3 pool 15 has the function of separating water, sludge and gas, thereby reducing sludge loss. Under the action of the No. 3 pool 15, the water enters the No. 4 pool 16 through the baffle pipe 24, the sludge settles to the bottom of the pool, and the gas is discharged through the exhaust pipe 5 through the exhaust hole 4. The above-mentioned anaerobic unit enables acid-producing bacteria and methanogenic bacteria to grow in their respective suitable environments, which is beneficial to the degradation of pollutants.

Granular sludge with anaerobic bacteria is placed in the anaerobic unit to anaerobically oxidize the organic matter in the sewage. Anaerobic biological treatment is an organic sewage treatment method that uses facultative anaerobic bacteria and obligate anaerobic bacteria to degrade macromolecular organic matter in sewage into low molecular compounds, and then converts them into methane and carbon dioxide. It is divided into acid digestion and alkaline digestion. two stages. during acidic digestion. The exoenzymes secreted by acid-producing bacteria turn macromolecular organic matter into simple organic acids and alcohols, aldehydes ammonia, carbon dioxide, etc.; in the alkaline digestion stage, the metabolites of acidic digestion are further decomposed into Biogases composed of methane and carbon dioxide. This treatment method is mainly used for the treatment of high-concentration organic wastewater and fecal sewage.

The second stage, aerobic treatment:

As shown in Figure 1-2, the sewage passes through the No. 3 pool 15 and then enters No. 4 pool 16 and No. 5 pool 17 through the baffle pipe 24, these two aerobic oxidation pools. The aerobic unit is conducive to the growth of decarburizing bacteria and denitrifying bacteria in their respective suitable environments, and is conducive to the removal of organic matter and ammonia nitrogen. The aerobic unit is designed as a biological floating bed, as shown in Figure 2. Specifically, the upper and lower wire meshes 27 suspended in the air are respectively set in the No. 4 pool 16 and the No. 5 pool 17, and the compartments formed by the upper and lower wire meshes 27 are filled. Fillers for aerobic reactions. The wire mesh 27 is supported by a wire mesh support 31 . In order to prevent the blockage of the bioreactor and further improve the denitrification efficiency of the activated sludge, the filler is a macroporous polyurethane filler 29, which not only solves the problem of the blockage of the fixed bed bioreactor, but also improves the denitrification efficiency of the activated sludge. Poor, low volume load and large mud production. No. 4 pool 16 and No. 5 pool 17 lower steel wire mesh 27 are provided with air distribution hole 30, and air distribution hole 30 is connected with aerator 7 through air distribution pipe 28 and air intake pipe 6. In this example, a blower aerator is used for air supply. The aerobic unit (No. 4 pool No. 16 and No. 5) adopts the intermittent aeration method that is beneficial to denitrification and denitrification, and the aeration rate is only 1/3 to 1/5 of that of ordinary activated sludge and fixed-bed reactors. Among them, the oxygen required by microorganisms is supplied by blast aeration. After the biofilm attached to the surface of the filler grows to a certain thickness, the microorganisms on the filler wall will perform anaerobic metabolism due to lack of oxygen, and the gas produced and the scouring effect formed by aeration will cause The biofilm falls off and promotes the growth of new biofilm. At this time, the shed biofilm will flow out of the pool with the effluent.

The aerobic unit has the following characteristics: 1) Due to the large specific surface area of the filler, the oxygenation conditions in the pool are good, and the amount of biosolids per unit volume in the pool is relatively high, so the biological contact oxidation tank has a high volume load; 2) Due to the biosolids in the pool 3) The amount of residual sludge is small, there is no problem of sludge bulking, and the operation and management are simple.

The third stage, sedimentation tank treatment:

In order to facilitate the reoxygenation of water and the precipitation of suspended solids, to reduce the impact of suspended solids on the subsequent processing unit, the baffle tube 24 extending into the No. 6 pool 18 is a diffuser tube 34, and the port of the diffuser tube 34 is trumpet-shaped. . The water spreading pipe 34 is made of a conical iron sheet 32, and is installed in No. 6 pool 18 by a water spreading pipe bracket 33. The water discharged from the aerobic oxidation tank of the No. 5 pool 17 is distributed to the trumpet-shaped water distribution pipe 34 in the No. 6 pool 18 through sedimentation to disperse the hydraulic impact of the water flow and further precipitate the sludge in the sewage. The quality of the effluent water discharged from the outlet 9 of the multifunctional baffle treatment module of No. 6 pool 18: COD≤150mg/L, suspended solids≤80mg/L, BOD≤60mg/L, meeting the "Farmland Irrigation Water Quality Standard" (GB5084 -2005) requirements.

As shown in Figure 1-2, in order to facilitate the discharge of sludge, each treatment unit is provided with a sludge discharge hole 25 near the bottom, and the sludge discharge hole 25 is connected to the sludge discharge branch pipe 11 through the sludge discharge gate valve 12, and finally the sludge discharge main pipe 10 discharge.

The percolation stage of the multi-media ecological percolation module:

As shown in Figure 3-4, the dimensions of the outer contour of the multi-media ecological infiltration module are 1.8m×2.4m×2.1m in length×width×height. is 0.6m; the filler at the lower part of the module is composed of 8 layers, and the height is 1.2m. The height of each layer of packing is 0.15m, wherein the bottom is a permeable filter layer 36 with a height of 0.05m; the top is a multi-media filter material layer 37 with a height of 0.1m. The multi-media filter material layer 37 on the top of each layer is alternately filled with multimedia filter material and water-permeable filter material, wherein the filling width of the multimedia filter material is 0.3m, and the filling width of the water-permeable filter material is 0.1m. The above filling method is the filling method of the character "pin", as shown in Figure 3. In this example, the filler of the multi-media filter material layer 37 is a multi-media filter material, which is mainly artificially synthesized functional ceramsite, supplemented by modified zeolite with a particle size greater than 2mm. The filling proportion volume ratio of the active zeolite is 1:1. The filler of the water-permeable filter layer 36 is a water-permeable filter material, which is composed of gravel with an average particle size of 10 mm and modified zeolite with a particle size greater than 2 mm. The volume ratio is 4:1.

The main part of the outer contour of the multi-media ecological infiltration unit is cylindrical, and the filler in the filter tank is filled with multiple layers in the shape of "product" until the upper surface of the filter tank. The multi-media filter material layer is mainly composed of artificially synthesized functional ceramsite, supplemented by modified zeolite; the water-permeable filter layer 36 is composed of gravel and modified zeolite. There is a water distribution system composed of six water distribution pipes 20 on the surface of the filter material top layer, and the water distribution pipes 20 are placed inside the aeration material 39 to fully aerate and prevent the outlet holes on the water distribution pipes 20 from clogging. The water distribution pipe 20 is connected with the water delivery pipe 19, and the sewage enters the multi-media filter layer 37 through the water delivery pipe 19, and the water distribution pipe 20 passing through the surface of the filter tank packing is evenly distributed on the top layer of the packing, and the sewage passes through the multi-media filter material layer 37 and The "product"-shaped filter material layer formed by the water-permeable filter layer 36 will partially penetrate into the water purification medium, and the water flow that cannot penetrate into the water purification medium and the water flow through the water purification medium will be introduced into the next layer of water purification medium through the water flow channel until Reach the last level of water purification medium. The bottom of the filter material layer is a supporting structure made of steel wire mesh. The sewage enters the sump 35 after passing through the filter layer, and then is discharged out of the pool through the water outlet 21 of the multi-media ecological filter treatment device.

The main materials of the filter layer: ash, gravel, zeolite, multi-media filter material, macroporous mesh carrier.

(1) Ash slag: Coal ash slag, the raw material is easy to get, economical, has a porous structure, has a certain adsorption capacity for nitrogen and phosphorus, and its micropores can form capillary water, so that the water can be raised to a certain height;

(2) Gravel, ordinary gravel, the raw material is easy to get, economical, mainly to provide the medium for the microbes to hang the film, and to fix the microbes;

(3) Zeolite, there are many kinds of zeolites, and the raw materials are easy to get. We use clinoptilolite, which has a certain adsorption capacity for phosphorus and ammonia nitrogen, and can play a role in deep phosphorus and nitrogen removal;

(4) The multi-media filter material is artificially synthesized functional ceramsite, which has high efficiency and has the functions of adsorbing nitrogen and phosphorus, immobilizing microorganisms and electrolyzing organic matter;

(5) The macroporous network carrier is a polyurethane microorganism immobilization material with large porosity and high bioburden, and its function is to immobilize microorganisms that efficiently degrade organic matter and denitrify.

Village sewage treatment method of the present invention specifically comprises the following steps:

In step A, the sewage is transported to the No. 1 pool 13 through the submersible sewage pump 1, and the septic and water quality treatment is performed through the anaerobic oxidation pool of the No. 1 pool 13;

In step B, the sewage treated in No. 1 pool 13 enters the anaerobic oxidation tank of No. 2 pool 14 through the baffle tube 24 for anaerobic treatment, wherein the role of the baffle tube 24 is to extend the path of the sewage and increase the residence time of the sewage;

In step C, the sewage treated in the No. 2 pool 14 is deflected through the baffle pipe 24 and enters the anaerobic oxidation pool of the No. 3 pool 15, and the water, sludge and gas are separated under the action of the three-phase distributor 26 in the No. 3 pool 15 , the water enters the No. 4 pool 16 through the baffle pipe 24, the sludge settles to the bottom of the pool, and the gas is discharged through the exhaust port;

In step D, the sewage treated in the No. 3 pool 15 is deflected through the baffle pipe 24 and enters the No. 4 pool 16 aerobic oxidation pool, and the No. 4 pool 16 is aerated for aerobic oxidation treatment;

In step E, the sewage enters the aerobic oxidation pool No. 5 pool 17 through the deflection pipe 24, and repeats the above step D;

In step F, the sewage treated in the No. 5 pool 17 enters the No. 6 pool 18 for sedimentation, further sediments the suspended solids of the sewage, and finally discharges the treated water meeting the standard requirements.

The above method integrates the functions of septic tank, anaerobic treatment, aerobic treatment, biological floating bed, sedimentation, etc., so that the organic matter in the sewage is converted into harmless substances under the action of anaerobic and aerobic microorganisms.

The rural sewage treatment method also includes the operation process of the multi-media ecological infiltration module. Specifically, the sewage passes through the water distribution pipe 20 on the surface of the filler in the filter tank step by step through the "multi-media filter material layer and the permeable filter layer 36. Product " font filter material layer, discharge after entering the sump 35 at the bottom of the filter tank. When the sewage flows through the multi-media ecological filter through the multi-functional baffle treatment module, the pollutants are intercepted and adsorbed on the surface of the multi-media filter material, and the microorganisms use the organic matter to grow and reproduce, and attach to the filter material to form a biofilm. After a period of time, the biofilm matures, and the microorganisms inhabiting the biofilm use the organic matter flowing through the surface as nutrients to adsorb, decompose and oxidize the organic matter in the sewage, thereby purifying the sewage flowing through the ecological filter.

The rural sewage treatment method, wherein the aeration in the steps D and E adopts intermittent aeration. The intermittent aeration method that is beneficial to denitrification and denitrification is adopted, and the aeration rate is only 1/3 to 1/5 of that of ordinary activated sludge and fixed bed reactors.

Therefore, a kind of rural sewage treatment method and its special device described in the present invention are comprehensively using physical treatment technologies such as sedimentation and filtration and biochemical treatment technologies such as anaerobic oxidation and aerobic oxidation to degrade organic matter in sewage, and inorganic salts It can be fixed, nutrients such as nitrogen and phosphorus can be reduced, and has the advantages of large hydraulic load and good water quality after treatment, which is especially suitable for my country's national conditions.

The embodiments described above are only one of the more preferred specific implementations of the present invention, and the usual changes and replacements performed by those skilled in the art within the scope of the technical solutions of the present invention should be included in the protection scope of the present invention.

Claims (10)

1. A special device for rural sewage treatment, comprising a submersible sewage pump and a multifunctional baffle treatment module connected to it, characterized in that: the multifunctional baffle treatment module includes six pools in sequence according to the sewage flow direction, respectively Three anaerobic units, two aerobic units and one sedimentation unit, adjacent processing units are connected by pipeline segments; among them, No. 1 pool, No. 2 pool and No. 3 pool are anaerobic units and each unit has The vent hole and the submersible sewage pump are connected to No. 1 pool, and there is a three-phase distributor in No. 3 pool; No. 4 and No. 5 pools are aerobic units, and the pools are equipped with suspended upper and lower steel wire meshes. A compartment is formed, and the compartment is filled with fillers for aerobic reaction. The steel wire mesh on the lower layer is provided with air distribution holes, and the air distribution holes are connected to the aerator through the air distribution pipe; the No. 6 pool is a sedimentation unit. 2. The special device for rural sewage treatment according to claim 1, characterized in that: it also includes a multi-media ecological infiltration module connected to the outlet of the multi-functional baffle treatment module through a pipeline, and the multi-media ecological infiltration module It is a filter tank containing a multi-media filter material layer. 3. The special device for rural sewage treatment according to claim 2, characterized in that: the upper part of the multi-media ecological infiltration module is an aeration material, which is a large-pore mesh carrier; the lower part of the filler is composed of at least 4 layers; The bottom of each layer of packing is a water-permeable filter layer, and the top is a multi-media filter material layer; the multi-media filter material layer is alternately filled with multi-media filter material and water-permeable filter material to form a "product"-shaped filling; the multi-media filter material layer is filled with artificial The synthesized functional ceramsite is mainly supplemented with modified zeolite, and the permeable filter layer is composed of gravel and modified zeolite. 4. The special device for rural sewage treatment according to claim 1, characterized in that: the pipes connected between the units are baffle pipes. 5. The special device for rural sewage treatment according to claim 1, characterized in that: the unit is provided with a mud discharge hole near the bottom. 6. The special device for rural sewage treatment according to claim 1, characterized in that: the filler is macroporous polyurethane filler. 7. The special device for rural sewage treatment according to any one of claims 1-6, characterized in that: the baffle pipe extending into the No. 6 pool is a diffuser pipe, and the port of the diffuser pipe is trumpet-shaped. 8. The rural sewage treatment method of the rural sewage treatment special device according to claim 1, comprising the steps of: In step A, the sewage is transported to the No. 1 pool, and the septic treatment and water quality adjustment are carried out through the anaerobic oxidation pool of the No. 1 pool; In step B, the sewage treated in the No. 1 pool enters the No. 2 pool anaerobic oxidation pool through the pipeline for anaerobic treatment; In step C, the sewage treated in the No. 2 pool enters the anaerobic oxidation pool of the No. 3 pool through the pipeline, and the water, sludge and gas are separated under the action of the three-phase distributor in the No. 3 pool, and the water enters the No. 4 pool through the pipeline. The sludge settles to the bottom of the tank, and the gas is discharged through the exhaust port; In step D, the sewage treated in the No. 3 pool enters the No. 4 pool aerobic oxidation pool through the pipeline, and the No. 4 pool is aerated for aerobic oxidation treatment; In step E, the sewage enters the aerobic oxidation pool of No. 5 pool through the pipeline, and repeats the above step D; In step F, the sewage treated in the No. 5 pool enters the No. 6 pool for sedimentation, further sediments the suspended solids of the sewage, and finally discharges the treated water that meets the standard requirements. 9. The rural sewage treatment method according to claim 8, characterized in that: it also includes the operation process of the multi-media ecological infiltration module, specifically, the sewage passes through the water distribution pipes on the surface of the filler in the filter tank step by step through the multi-media filter material The "product"-shaped filter material layer composed of the filter layer and the permeable filter layer enters the sump at the bottom of the filter and is discharged. 10. The rural sewage treatment method according to claim 8 or 9, characterized in that: the aeration in the steps D and E adopts an intermittent aeration method.

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