CN209210593U - A kind of town sewage treatment system - Google Patents

Abstract

The utility model discloses a kind of town sewage treatment systems, belong to technical field of sewage.The system includes sequentially connected grid, setting pot, anaerobic pond, anoxic pond, aerobic tank, secondary settling tank, filtering ponds and sterilization pool, and the aerobic tank is connected with the anoxic pond, and the mud discharging mouth of the secondary settling tank is connect with the anaerobic pond；The mud discharging mouth of the secondary settling tank is connect with sludge concentration tank, and the sludge concentration tank is connect with sludge dewatering equipment and the setting pot respectively, and the sludge dewatering equipment is connect with the setting pot.The process town sewage that the utility model uses materialization+biochemistry+materialization to combine, have the advantages that rational technology, treatment effect are stable, water outlet can reach " urban wastewater treatment firm pollutant emission standard " (GB18918-2002) level-one A standard.

Description

A kind of urban sewage treatment system

technical field

The utility model belongs to the technical field of sewage treatment, and more specifically relates to an urban sewage treatment system.

Background technique

With the development of the economy and the growth of the population, the speed of urbanization is accelerating, followed by the continuous discharge of urban sewage and its treatment. In order to alleviate the pressure on the environment, the problem of urban sewage treatment is one of the problems that must be faced and solved in the process of urbanization.

Urban sewage includes domestic sewage of urban residents, drainage of government agencies, schools, hospitals, commercial service agencies and various public facilities, as well as industrial wastewater and initial rainwater that are allowed to be discharged into urban sewage collection systems, and has the following characteristics: (1) Small population, The standard of water consumption is low, and the scale of sewage treatment is small; (2) The specific differences in industrial structure, the influence of the rainy season and the time-to-time variation coefficient of water consumption are relatively large, so the volume and quality of sewage vary greatly; (3) The level of economic development is relatively low, and the economic Weak bearing capacity and few applicable technologies to choose from; (4) The project construction cost and operation cost are too high due to the small processing scale; (5) There is a serious lack of maintenance management technicians and operation management experience. At present, there is no suitable treatment process for urban sewage treatment projects (the treatment scale is less than 20,000 tons/day, mostly concentrated at 2,000-5,000 tons/day) in China.

The Chinese patent 201210302700.7 with the publication date of November 14, 2012 discloses an urban sewage treatment system and method. The system includes a grid sewage treatment device, a grit chamber, an anoxic pond, an MBR aerobic pond, The interior is filled with a composite adsorbent of nano-hydration iron oxide and an adsorption filter and a disinfection tank. Among them, the bottom of the MBR aerobic tank is provided with a sludge outlet for discharging sludge. The corresponding treatment method of the treatment system includes sewage treatment with a grid The device removes suspended solids, precipitates inorganic particles with a grit chamber, denitrifies and denitrifies, uses MBR membrane modules for deep purification, uses nano-hydration iron oxide adsorbents for phosphorus removal, and disinfects the treated water after the above steps. Among them, part of the sludge from the deep purification treatment of the MBR membrane module is returned to the denitrification and denitrification treatment. The biggest problem with this technology is that it needs to use a treatment agent with high technical content, its application and maintenance have high technical requirements, and it is not suitable for the treatment of urban sewage.

Contents of the invention

Purpose of the invention: Aiming at the above-mentioned problems in the prior art, the purpose of this utility model is to provide an urban sewage treatment system.

Technical solution: In order to solve the above problems, the technical solution adopted in the utility model is as follows:

An urban sewage treatment system, comprising a grid, a grit chamber, a biological treatment unit, a secondary sedimentation tank, a filter tank and a disinfection tank connected in sequence, the biological treatment unit is used to remove most of the organic pollutants by biochemical treatment, The sludge discharge outlet of the secondary settling tank is connected with the sludge thickening tank, and the sludge thickening tank is respectively connected with the sludge dehydrator and the grit chamber, and the sludge dewaterer is connected with the grit chamber .

The main biological treatment unit includes an anaerobic tank, an anoxic tank and an aerobic tank connected in sequence, the aerobic tank is connected to the anoxic tank, and the sludge discharge port of the secondary settling tank is connected to the anaerobic tank. The pool is connected.

The filter tank is a V-shaped filter tank, and the V-shaped filter tank adopts a micro-resistance water distribution system. The filter material is a single-layer quartz sand homogeneous filter material, the quartz sand layer is 1.2 meters thick, and the effective particle size of the quartz sand is 0.90- 1.20mm.

The grid includes a coarse grid and a fine grid, the grid gap of the coarse grid is 30 mm, and the grid gap of the fine grid is 8 mm.

The grit chamber is an aerated grit chamber.

The secondary sedimentation tank is a radial flow sedimentation tank, in which a scraper and suction dredger is installed.

The volume ratio of anaerobic pool, anoxic pool and aerobic pool is 1:1:3.

Beneficial effects: Compared with the prior art, the utility model adopts a combination of physicochemical + biochemical (anaerobic + anoxic + aerobic) + physical and chemical process to treat urban sewage, and the treated sewage meets the requirements of "urban sewage treatment" The factory pollutant discharge standard "(GB18918-2002) Class A standard requirements, the treatment and maintenance process is simple, the treatment effect is good, the device operation is reliable, and the economy is reasonable. The urban sewage treatment system of the utility model not only broadens the treatment process of this type of sewage, but also has certain reference value for the treatment of other industrial sewage.

Description of drawings

Fig. 1 is the schematic flow chart of urban sewage treatment process of the present utility model.

Detailed ways

The utility model is further described below in conjunction with specific embodiments.

Example

An urban sewage treatment device, including grille, grit chamber, anaerobic pond, anoxic pond, aerobic pond, secondary settling pond, V-shaped filter pond, disinfection pond, sludge concentration pond, and sludge dewatering machine; As shown in Figure 1, urban sewage passes through the grid, grit chamber, anaerobic pond, anoxic pond, aerobic pond, secondary settling pond, V-shaped filter and disinfection pond in sequence; the aerobic pond is connected to the anoxic pond; The sedimentation tank is connected to the anaerobic tank; the secondary sedimentation tank is also connected to the sludge concentration tank; the sludge concentration tank is connected to the grit chamber; the sludge concentration tank is also connected to the sludge dewatering machine, and the sludge dehydrator is connected to the grit chamber .

in:

The grille has two grilles, coarse grille and fine grille. The gap between the bars of the coarse grille is 30mm, and the gap between the bars of the fine grille is 8mm. The slag removal method of the grille is mechanical cleaning; Set the intake pump room with a fine grill.

The grit chamber is an aerated grit chamber, which uses perforated aeration tubes for aeration, the main purpose of which is to remove inorganic particles with a large specific gravity.

The aerobic tank adopts SBR activated sludge method, and the volume ratio of anaerobic tank, anoxic tank and aerobic tank is 1:1:3.

The secondary sedimentation tank is a radial flow sedimentation tank, and a scraper and suction machine is installed in the tank;

The V-shaped filter adopts a micro-resistance water distribution system. The filter material is a single-layer quartz sand homogeneous filter material. The thickness of the quartz sand layer is 1.2 meters. The effective particle size of the quartz sand is 0.90-1.20mm. A combination of sweeping and washing.

A chlorine dioxide generator is provided in the disinfection pool, and the chlorine dioxide generator is placed in the chlorination room.

The sludge dewatering machine is a belt filter press.

The above-mentioned device is used to treat an urban sewage with a water volume of 8000m ³ /d, including the following steps as shown in Figure 1:

Step 1, pass the urban sewage through the grid to remove the floating and suspended matter and then pass it into the aeration grit chamber;

Step 2, the sewage passes through the aeration grit chamber to remove most of the inorganic sand particles;

Step 3, the effluent from the grit chamber passes through the anaerobic tank, the anoxic tank and the aerobic tank in order to remove most of the organic pollutants (including ammonia nitrogen, total phosphorus, etc.), and 1/3 of the effluent from the aerobic tank is returned to the anoxic tank ( That is, nitrifying liquid backflow) to remove ammonia nitrogen, and the rest of the effluent enters the radial flow secondary sedimentation tank. The hydraulic retention time of the sewage in the anaerobic tank is 1.5h, and the residence time in the anoxic tank is 1.5h. The residence time is 4.5h;

Step 4, the sewage is further removed from the suspended solids in the radial flow secondary settling tank, and part of the sludge in the secondary settling tank is returned to the anaerobic tank to ensure the amount of useful microorganisms. The sludge return ratio is 1:3;

Step 5, in order to further improve the treatment effect of sewage, the effluent of the secondary sedimentation tank enters the V-shaped filter tank, and the sewage is further purified through the filtration of quartz sand, and then the sewage is sent to the disinfection tank, and then discharged after disinfection with chlorine dioxide;

Step 6, the remaining sludge in the secondary settling tank is discharged into the sludge thickening tank for gravity concentration, and the obtained supernatant is returned to the grit chamber; the concentrated sludge enters the sludge dehydrator for dehydration, and the obtained leachate is returned to the grit chamber pond, and the mud cake obtained from dehydration is shipped out.

The relevant water quality indicators of the treated sewage are shown in Table 1, which shows that the final effluent quality is better than the requirements of the first-level A standard of the "Pollutant Discharge Standards for Urban Wastewater Treatment Plants" (GB18918-2002).

Table 1 Water quality indicators of sewage before and after treatment

Claims (7)

1. a kind of town sewage treatment system, which is characterized in that including sequentially connected grid, setting pot, biological processing unit, Secondary settling tank, filtering ponds and sterilization pool, the biological processing unit are used to remove most organic pollutants using biochemical treatment, The mud discharging mouth of the secondary settling tank is connect with sludge concentration tank, the sludge concentration tank respectively with sludge dewatering equipment and described heavy The connection of sand pond, the sludge dewatering equipment are connect with the setting pot.

2. town sewage treatment system according to claim 1, which is characterized in that the main body biological processing unit includes Sequentially connected anaerobic pond, anoxic pond and aerobic tank, the aerobic tank are connected with the anoxic pond, the sludge row of the secondary settling tank Mouth is put to be connected with the anaerobic pond.

3. town sewage treatment system according to claim 1, which is characterized in that the filtering ponds are V-type filter tank, described V-type filter tank uses micro- resistance water distribution system, and filtrate is single layer quartz sand homogeneous filtering material, and 1.2 meters of quartz sand thickness, quartz sand has Effect partial size is 0.90~1.20mm.

4. town sewage treatment system according to claim 1, which is characterized in that the grid includes coarse rack and thin lattice Grid, the grizzly bar gap of the coarse rack are 30mm, and the grizzly bar gap of the fine fack is 8mm.

5. town sewage treatment system according to claim 1, which is characterized in that the setting pot is aerated grit chamber.

6. town sewage treatment system according to claim 1, which is characterized in that the secondary settling tank is radial-flow type sedimentation Scraping and sucking machine is arranged in pond in pond.

7. town sewage treatment system according to claim 1, which is characterized in that anaerobic pond, anoxic pond, the appearance of aerobic tank Product is than being 1:1:3.