CN205045961U - Treatment of domestic sewage constructed wetland system - Google Patents

Abstract

The utility model discloses an artificial wetland system for domestic sewage treatment, which solves the problems that the sewage treatment system is prone to drainage blockage, low sewage treatment efficiency and high space occupation due to the poor connection of various functional module structures of the sewage treatment system. Its technical scheme The main point is to include the regulating pool, anaerobic pool, anoxic pool, aerobic pool, secondary sedimentation pool, intermediate pool, and artificial wetland pool connected in sequence, and the anaerobic pool, aerobic pool, secondary sedimentation pool, and intermediate pool are surrounded by four form a circle; the regulating tank receives domestic sewage through the collection pipe network; a mixed liquid return passage is provided between the aerobic tank and the anoxic tank; a sludge return passage is provided on the secondary settling tank to drain the sewage The mud returns to the anoxic pool and the anaerobic pool, achieving the effect of a constructed wetland system for domestic sewage treatment with high space utilization and high sewage treatment efficiency.

Description

Artificial wetland system for domestic sewage treatment

technical field

The utility model relates to the technical field of domestic sewage treatment, in particular to an artificial wetland system for domestic sewage treatment.

Background technique

The main pollutants of domestic sewage are organic matter and nutrients such as nitrogen and phosphorus. The water quality is characterized by stable but turbid water quality, deep color and foul smell, slightly alkaline, generally does not contain toxic substances, and contains a large number of bacteria, viruses and parasites egg. In the prior art, artificial wetlands are usually used for sewage treatment, while the existing artificial wetland systems often use the surface flow method. The disadvantage is that the load is small, the northern surface will freeze in winter, mosquitoes will breed in summer, and there will be odor. taste.

Other domestic sewage treatment systems are prone to drainage blockage, low sewage treatment efficiency, high space occupation, and waste of land resources due to the poor connection of each functional module structure. Therefore, an improved domestic sewage treatment system is needed to adapt Government departments have requirements for environmental protection and long-term use of environmental facilities after they are built.

Utility model content

In view of the deficiencies in the prior art, the purpose of the utility model is to provide a domestic sewage treatment artificial wetland system with high space utilization rate and high sewage treatment efficiency.

In order to achieve the above purpose, the utility model provides the following technical solutions: a domestic sewage treatment artificial wetland system, including regulating pool, anaerobic pool, anoxic pool, aerobic pool, secondary sedimentation pool, intermediate pool, artificial The wetland pool, and the anaerobic pool, aerobic pool, secondary sedimentation pool, and intermediate pool form a circle;

The regulating tank receives domestic sewage through the collection pipe network;

A mixed liquid return path is provided between the aerobic pool and the anoxic pool;

A sludge return channel is provided on the secondary settling tank to return the sludge to the anoxic tank and the anaerobic tank.

Preferably, the water inlet of the regulating pool is provided with a grill, the grill is made of stainless steel, and the grill is arranged obliquely.

Preferably, the adjustment tank is filled with microbial carrier fiber membranes, the anaerobic tank is also provided with a submersible mixer, and the adjustment tank and the intermediate tank are equipped with two tear-type lift pumps, one for use and the other for standby.

Preferably, the aerobic tank is provided with a variable microporous aerator connected to the fan, the secondary settling tank is provided with inclined pipe fillers, the secondary settling tank is adjacent to the intermediate tank, and a zigzag overflow tank is provided between them .

Preferably, the constructed wetland pool includes a waterproof geomembrane layer, a pebble layer, a sand layer and an aquatic plant layer from bottom to top, the pebbles in the pebble layer have a particle size of 25-35mm, and the cobblestone layer and the sand layer Thickness ratios range from 4:1 to 5:1.

Preferably, the cobblestone layer and the sand layer are provided with water distributors, and the water distributors are arranged in two rows up and down.

Compared with the prior art, the beneficial effect of the utility model is that: by sequentially processing the treatment pools one by one, and the arrangement of each treatment pool is a rectangle, writing a circular flow direction around the city, there is not too much between the treatment pools The land interval and pipeline laying are directly separated by partitions and flowed in the way of overflow, which can effectively save space, greatly improve the land utilization rate, effectively save land resources, and also efficiently purify sewage.

Description of drawings

Fig. 1 is the system structural block diagram of the utility model embodiment;

Fig. 2 is the layout drawing of each processing pool;

Fig. 3 is the sectional view of A-A plane of Fig. 2;

Fig. 4 is the sectional view of the B-B plane of Fig. 2;

Figure 5 is a layer structure diagram of the constructed wetland.

In the figure 1. Regulating tank; 2. Anaerobic tank; 3. Aerobic tank; 4. Secondary sedimentation tank; 5. Intermediate tank; 6. Well cover; 7. Overflow port; 8. Lift pump; 9. Mixer; , variable microporous aerator; 11, grille; 12, microbial carrier fiber membrane; 13, lift pump; 14, sludge return pump; 14, inclined pipe packing; 15, waterproof geomembrane layer; 16, cobblestone layer ; 17, sand layer; 18, aquatic plant layer; 19, water distributor.

detailed description

The embodiment of the utility model will be further described with reference to Fig. 1 to Fig. 5 .

As shown in Figure 1, a constructed wetland system for domestic sewage treatment includes a regulating pool 1, an anaerobic pool 2, anoxic pool, an aerobic pool 3, a secondary sedimentation pool 4, an intermediate pool 5, and a constructed wetland pool connected in sequence. And the anaerobic pool 2, the aerobic pool 3, the secondary sedimentation pool 4, and the intermediate pool 5 form a circle; the regulating pool 1 receives domestic sewage through the collection pipe network; the aerobic pool 3 and the anoxic pool There is a mixed liquid return passage between them; a sludge return passage is provided on the secondary settling tank 4 to return the sludge to the anoxic tank and the anaerobic tank 2. The sewage is collected through the collection pipe network and then discharged into the regulating pool 1, and then flows through the anaerobic pool 2, the aerobic pool 3, the secondary sedimentation pool 4, the intermediate pool 5, and the artificial wetland pool, and the pollutants are regenerated through the artificial wetland. Biological purification treatment, so as to meet the discharge standard and then discharge, which complies with the national sewage treatment standard. Due to the unreasonable layout and setting of the existing system, it is easy to cause a large space occupation and waste of land resources.

With this plan, the processing is carried out in sequence according to the treatment pools, and the arrangement of each treatment pool is rectangular, and a circular flow direction is written around the city. There are not too many land intervals and pipeline laying between the treatment pools, and the partition boards are directly used Separation, flow in the way of overflow, which can effectively save space, greatly improve the utilization rate of land, effectively save land resources, and at the same time purify sewage efficiently. At the same time, in order to improve the efficient treatment of sewage, a mixed liquid return channel is formed between the aerobic pool 3 and the anoxic pool, thereby realizing cyclic degradation. Not only that, but also a sludge return channel is formed between the secondary settling tank 4 and the anoxic tank and the anaerobic tank 2, so that multiple cycles, the mixed solution and the sludge fully return, and effectively improve the degradation efficiency of sewage.

As shown in Figure 2, the anoxic pool and the anaerobic pool 2 can be combined into the same anaerobic pool 2. The spatial arrangement of each treatment tank, the anaerobic tank 2, the aerobic tank 3, the secondary sedimentation tank 4, and the intermediate tank 5 form a circle. When explaining this, it should be understood according to the arrangement structure in Figure 2. There are observation ports on the treatment tanks, that is, manhole covers 6, and overflow ports 7 are arranged between each treatment tank, and the sewage flows to the next treatment tank through these overflow ports 7. As shown in Figure 2, the sewage passes through the drains Oxygen tank 2, aerobic tank 3, secondary sedimentation tank 4, and intermediate tank 5 just form a circle, and this structure saves space.

As shown in Fig. 3, the water inlet of the adjustment pool 1 is provided with a grille 11, the grille 11 is made of stainless steel, and the grille 11 is arranged obliquely. Sewage enters the regulating tank 1 first from the water inlet. Through the grille 11, the sewage can be physically filtered and separated, and the grille 11 is set at an inclination. According to the analysis of the water flow, the inclination angle can be 30 degrees. In a fixed way , the grid 11 is more stable after being stressed, and at the same time, it can allow the sewage to buffer before entering the regulating tank 1 .

As can be seen in Figures 3 and 4, the microbial carrier fiber membrane 12 is filled in the adjustment tank 1, a submersible mixer is also provided in the anaerobic tank 2, and a utility is provided in the adjustment tank 1 and the intermediate tank 5. Two tear-off lift pumps 138 are prepared. The use of two tear-off lift pumps 138 can speed up the mixing and decomposition of sludge, and the way of using one for use and one for standby can control the output of stirring force according to actual needs, thereby saving more energy.

The aerobic tank 3 is provided with a variable microporous aerator 10 connected to the fan, and the secondary settling tank 4 is provided with an inclined pipe filler 14. The secondary settling tank 4 is adjacent to the intermediate tank 5, and there is a zigzag between them. overflow tank. The variable microporous aerator 10 is connected with a fan, and the variable microporous aerator 10 is ventilated by the fan, so that oxygen can be input into the aerobic pool 3 .

As shown in Figure 5, the constructed wetland pool comprises a waterproof geomembrane layer 15, a pebble layer 16, a sand layer 17 and an aquatic plant layer 18 from bottom to top, and the pebbles in the pebble layer 16 adopt a particle size of 25-35mm, and the The thickness ratio of the cobblestone layer 16 to the sand layer 17 ranges from 4:1 to 5:1. Through this layer structure, sewage can be effectively degraded, and toxic compounds in sewage can be absorbed by plants. The cobblestone layer 16 and the sand layer 17 are provided with water distributors 19, and the water distributors 19 are arranged in two rows up and down. Adopting this distribution structure can allow the sewage to nourish the plants.

The whole working principle is as follows: the domestic sewage is treated by septic tank (fermentation and decomposition), and the decayed dung residue can be used as green fertilizer. After the scum is intercepted in the grid 11 well, it flows into the adjustment pool 1 by gravity, and the water quality and quantity are adjusted in the adjustment pool 1. After the water quality and quantity are adjusted in the adjustment pool 1, it is lifted into the anaerobic pool 2 by the lifting device. Bioflocculation and biodegradation functions in one, including a comprehensive reaction process including physics, chemistry and biochemistry. Through a series of comprehensive reactions, carbohydrates can be degraded into fatty acids, solid substances can be degraded into soluble substances, and macromolecular organic matter can be decomposed into small molecular organic matter, which is convenient for aerobic reaction.

After anaerobic treatment, the sewage flows into the anoxic tank (denitrification tank) by itself. The anoxic tank is mainly composed of facultative microorganisms, suspended solids and attached microorganisms; the anoxic tank is equipped with combined fillers and submerged stirring. System, reflux aerobic pool 3 After the sewage and raw water are mixed, the dissolved oxygen rate is controlled at (0.1-0.2mg/L), and the microbial growth in the pool is dominated by facultative bacteria; NH4-N is treated by denitrification.

After staying in the anoxic tank for a period of time, the sewage flows into the aerobic tank 3 (nitrification tank) by itself. The aerobic tank 3 mainly uses aerobic treatment microorganisms, mainly suspended and attached microorganisms, and the organic matter in the sewage is in this tank. It can be effectively degraded, and ammonia nitrogen can be nitrified.

The degraded sewage enters the secondary sedimentation tank 4 together with part of the suspended sludge, where the sludge and water are separated, and the clarified liquid enters the intermediate tank 5, and is pumped and sent to the constructed wetland for treatment before being discharged up to standard. The sedimentation sludge in the secondary settling tank 4 returns to the front end of the anoxic tank through the backflow device to prevent the loss of bacteria, and the sewage (nitrification liquid) in the aerobic tank 3 returns to the anoxic tank through the backflow device for denitrification and denitrification. The sludge in the adjustment tank 1 and the remaining sludge in the secondary sedimentation tank 4 are regularly pumped out by the dung truck and then transported abroad.

The function of the grid 11: Before the sewage is lifted, some large suspended solids are removed through the grid 11 well to prevent the motor from burning out after the sewage pump is blocked.

The role of regulating tank 1: due to the inhomogeneity of the sewage water quality and water volume at each sewage discharge point in the area, in order to ensure the relative stability of the follow-up treatment system, the regulating tank 1 is set up to adjust the water quality and water volume.

The role of anaerobic pool 2: The sewage is lifted into the anaerobic pool 2 through the lifting device. The anaerobic pool 2 is equipped with a combined filler and a water distribution system. The microbial growth in the pool is dominated by anaerobic bacteria.

The role of the anoxic pool: the sewage is lifted into the anoxic pool by the lifting device. The anoxic pool is equipped with a combined filler and a submersible mixing system. The microbial growth in the pool is dominated by facultative bacteria.

The function of the aerobic pool 3: the water from the anoxic pool flows into the aerobic pool 3 by itself. The aerobic pool 3 is equipped with a combined filler and a microporous aeration system. The microbial growth in the pool is dominated by aerobic bacteria. Through aerobic treatment, the sewage in the sewage Organic pollutants are greatly degraded.

The role of the secondary settling tank 4: the sewage after aerobic treatment flows to the secondary settling tank 4 by itself, and its outlet tank is designed in the form of a toothed sump to make the effluent more uniform, and the effluent can reach the standard stably. At the front end of the pool, the remaining part of the sludge is regularly sucked away by a municipal fecal suction truck.

The role of the intermediate pool 5: the sewage settled in the secondary sedimentation tank 4 flows to the intermediate pool by itself, and is sent to the constructed wetland by the lifting pump 138 for further treatment.

The function of the constructed wetland pool: Different from the traditional constructed wetland, the vertical upward flow is adopted, which breaks the limitation of the independent separation of the water distribution system and the matrix filler in the traditional constructed wetland; the water distribution system, that is, the water distribution pipe, is directly extended into the constructed wetland matrix At the bottom of the packing bed, use perforated water distribution pipes to distribute water at multiple points. Compared with the traditional surface flow and subsurface flow, its distribution is uniform, there is no dead zone and short zone, and the utilization efficiency of the constructed wetland is greatly improved. Therefore, compared with traditional constructed wetlands, the occupied area is smaller, and the unique structural design of the system enables the entire system to form an anaerobic environment at the bottom, a facultative environment in the middle and an aerobic environment in the upper part. The coexistence of anaerobic and aerobic conditions promotes the degradation of pollutants and improves the removal rate of nitrogen and phosphorus in the system.

The above descriptions are only preferred implementations of the present utility model, and the protection scope of the present utility model is not limited to the above-mentioned embodiments, and all technical solutions under the idea of the present utility model all belong to the protection scope of the present utility model. It should be pointed out that for those skilled in the art, some improvements and modifications without departing from the principle of the utility model should also be regarded as the protection scope of the utility model.

Claims (6)

1. A constructed wetland system for domestic sewage treatment, characterized in that: comprising successively connected regulating ponds, anaerobic ponds, anoxic ponds, aerobic ponds, secondary sedimentation ponds, intermediate ponds, constructed wetland ponds, and anaerobic ponds, The aerobic tank, the secondary sedimentation tank and the intermediate tank form a circle; The regulating tank receives domestic sewage through the collection pipe network; A mixed liquid return path is provided between the aerobic pool and the anoxic pool; A sludge return channel is provided on the secondary settling tank to return the sludge to the anoxic tank and the anaerobic tank. 2. The artificial wetland system for domestic sewage treatment according to claim 1, characterized in that: the water inlet of the adjustment pool is provided with a grill, the grill is made of stainless steel, and the grill is arranged obliquely. 3. The artificial wetland system for domestic sewage treatment according to claim 1, characterized in that: the adjustment tank is filled with microbial carrier fiber membranes, the anaerobic tank is also provided with a submersible mixer, the adjustment tank and the intermediate tank Both are equipped with two tear-off lift pumps, one for use and the other for standby. 4. The artificial wetland system for domestic sewage treatment according to claim 1, characterized in that: the aerobic tank is provided with a variable microporous aerator connected to the fan, and the secondary sedimentation tank is provided with inclined pipe packing, and the secondary sedimentation tank The pool is set adjacent to the middle pool, with a zigzag overflow tank between them. 5. The domestic sewage treatment constructed wetland system according to claim 1, characterized in that: the constructed wetland pool comprises a waterproof geomembrane layer, a pebble layer, a sand layer and an aquatic plant layer from bottom to top, and the pebble layer The pebbles used have a particle size of 25-35mm, and the thickness ratio of the pebble layer to the sand layer is in the range of 4:1 to 5:1. 6. The artificial wetland system for domestic sewage treatment according to claim 5, characterized in that: the cobblestone layer and the sand layer are provided with water distributors, and the water distributors are provided with two rows up and down.