CN116282529A - Post sulfur autotrophic nitrogen removal integrated domestic sewage treatment equipment - Google Patents

Abstract

The invention relates to a post-sulfur autotrophic nitrogen removal integrated domestic sewage treatment device which consists of a hydrolysis acidification area, a contact oxidation area, a high-efficiency sedimentation area, a post-sulfur autotrophic nitrogen removal filter tank and other units, and is supplemented with an aeration device, MBBR biological filler, sulfur autotrophic filter tank biological filler, a filter tank supporting layer, a backwashing back-flushing system, a high-efficiency inclined pipe filler and the like, wherein the high-efficiency sedimentation area is used for performing mud-water separation, and the post-sulfur autotrophic nitrogen removal filter tank is used for removing total nitrogen, so that an additional carbon source is not needed, and the device is high in efficiency, energy-saving and environment-friendly, simple to manufacture, convenient to install and small in occupied area; the method is suitable for treating domestic sewage with lower C/N ratio, has stable denitrification effect, avoids the dependence of a denitrification system on an external carbon source, can stably discharge the treated sewage up to the standard, and can also be reused for greening irrigation and the like.

Description

A post-installed sulfur autotrophic denitrification integrated domestic sewage treatment equipment

technical field

The invention relates to the technical field of domestic sewage treatment, in particular to a post-installed sulfur autotrophic denitrification integrated domestic sewage treatment equipment.

Background technique

Biological denitrification technology is a process in which nitrate nitrogen and nitrite nitrogen are reduced to gaseous nitrogen under the action of denitrifying bacteria through denitrification reaction, which can be divided into heterotrophic denitrification and autotrophic denitrification. For some waste water with low C/N ratio, such as groundwater, secondary effluent of urban sewage plants, pickling cleaning waste water, etc., the organic carbon source is insufficient, and it is necessary to add carbon source (methanol, glucose, sodium acetate, etc.) to provide electrons for heterotrophic denitrification. donor and energy. Its disadvantages are: the carbon source pool is increased, its cost is high, and the denitrification efficiency is low. At present, most domestic sewage is treated by septic tanks, and part of BOD will be digested, resulting in relatively low C/N (i.e. carbon-to-nitrogen ratio) of sewage. Currently, integrated sewage treatment equipment on the market mainly adopts traditional equipment, such as A/O, Processes such as A ² /O and its variant processes, etc., all use heterotrophic denitrification technology. The disadvantages of denitrification of this kind of process appear in the case of small-scale sewage treatment.

The main defects are as follows: First, the integrated equipment is characterized by integration and compact equipment, but it requires a large amount of nitrifying liquid to return during denitrification treatment, and it is necessary to ensure the residence time of sewage treatment, so it is necessary to ensure that the volume of the equipment reaches the design parameters. The latter has a big contradiction in the actual situation; second, in order to ensure that the C/N ratio reaches more than 4:1, an external carbon source is required, and additional carbon source dosing equipment is required. Accurate calculation of the dosage can ensure that the C/N reaches the set range. The denitrification effect of most integrated equipment on the market is unstable and the efficiency is low.

The invention is an integrated equipment for denitrification using autotrophic denitrification technology, which has high denitrification efficiency and low operation cost.

Contents of the invention

In order to solve the above-mentioned technical problems, the present invention is a post-installed sulfur autotrophic denitrification integrated domestic sewage treatment equipment, and its technical solution is:

Including hydrolytic acidification zone, contact oxidation zone, high-efficiency precipitation zone and post-installed sulfur autotrophic denitrification filter, the sewage passes through the water inlet in sequence through hydrolytic acidification zone, contact oxidation zone, high-efficiency precipitation zone and post-installed sulfur autotrophic denitrification filter , the hydrolytic acidification zone and the contact oxidation zone are separated by a partition, and their bottoms are connected. The liquid outlet of the contact oxidation zone is set on the upper right side of the contact oxidation zone, and is connected with the liquid inlet of the central guide tube. The liquid outlet of the central guide tube is vertically downward;

The liquid inlet between the high-efficiency sedimentation area and the rear sulfur autotrophic denitrification filter is set on the upper right side of the high-efficiency sedimentation area, and the liquid inlet is connected to the V-shaped distribution tank of the filter; there is a sludge return at the bottom of the high-efficiency sedimentation area The pipeline is connected back to the hydrolytic acidification area;

In the rear sulfur autotrophic denitrification filter, from top to bottom are filter backwash sump, filter V-shaped distribution tank, sulfur autotrophic filter biological filler and filter support layer; On the right side of the washing sump, there is a return pipeline connected to the hydrolytic acidification area;

A backwash water inlet and an air inlet are provided at the inner bottom of the rear sulfur autotrophic denitrification filter, and the air delivery pipeline is respectively connected with the air inlet at the bottom of the contact oxidation zone and the air inlet of the rear sulfur autotrophic denitrification filter;

Biological fillers are respectively filled in the hydrolytic acidification zone, contact oxidation zone, high-efficiency precipitation zone and post sulfur autotrophic denitrification filter.

Further, a water outlet is provided on the right side of the lower part of the rear sulfur autotrophic denitrification filter.

Further, the bottom of the high-efficiency sedimentation zone is a sludge hopper, and the bottom of the sludge hopper is a funnel-type sewage outlet. The top of the central guide tube is fixed on the top of the equipment, and the center guide tube is vertically downward, and a The side opening is connected to the liquid outlet of the contact oxidation zone, and the bottom opening of the cylinder is downward, from the contact oxidation zone to the central guide tube, the material in the guide tube flows out from the sludge hopper; in the middle of the high-efficiency sedimentation zone, there is also an inclined tube filler.

Further, an aeration device is provided at the bottom of the contact oxidation zone.

Further, the contact oxidation zone and the high-efficiency precipitation zone, and the high-efficiency precipitation zone and the post-installed sulfur autotrophic denitrification filter are respectively separated by partitions, and the upper parts thereof communicate with each other.

Further, the hydrolytic acidification zone is an anoxic zone.

The beneficial effects of the present invention are: the present invention is a post-installed sulfur autotrophic denitrification integrated domestic sewage treatment equipment, which consists of hydrolysis acidification area, contact oxidation area, high-efficiency precipitation area and post-installed sulfur autotrophic denitrification filter. Composition, supplemented by aeration device, MBBR biological filler, sulfur autotrophic filter biological filler, filter support layer, backwashing and blowing system and high-efficiency inclined tube filler, etc., the high-efficiency sedimentation zone is used for mud-water separation, and the post-set sulfur autotrophic filter is used The denitrification filter is used for the removal of total nitrogen without additional carbon source, high efficiency, energy saving, and environmental protection. The nitrogen effect is stable, avoiding the dependence of the denitrification system on external carbon sources, and the treated sewage can be stably discharged up to the standard, and can also be reused for green irrigation.

Description of drawings

Fig. 1 is a structural representation of the present invention;

As shown in the figure, 1 water inlet, 2 hydrolytic acidification zone, 3 contact oxidation zone, 4 high-efficiency sedimentation zone, 5 rear sulfur autotrophic denitrification filter, 6 inclined tube packing, 7 central guide tube, 8 aeration device , 9MBBR biological filler, 10 sulfur autotrophic filter biological filler, 11 filter support layer, 12 filter V-shaped cloth sink, 13 filter backwash sump, 14 water outlet, 15 backwash water inlet, 16 air delivery Pipeline, 17 filter tank backwash water return pipeline, 18 sludge return pipeline, 19 sludge return pump, 20 intake pump, 21 internal return pump.

Detailed ways

As shown in the figure, the present invention is a post-installed sulfur autotrophic denitrification integrated domestic sewage treatment equipment, including hydrolytic acidification zone 2 (that is, anoxic zone), contact oxidation zone 3, high-efficiency precipitation zone 4 and post-sulfurization zone Autotrophic denitrification filter 5, the sewage passes through the water inlet successively through the hydrolytic acidification zone, contact oxidation zone, high-efficiency sedimentation zone and post-installed sulfur autotrophic denitrification filter. Both the hydrolysis acidification zone and the contact oxidation zone are replaced by MBBR biological filler 9 Traditional elastic fillers, combined fillers, etc. have large specific surface area, good hydrophilicity, high biological activity, fast film formation, good treatment effect, long service life, and fluidization can be achieved with small aeration or stirring. A continuous gradient dissolved oxygen gradient is continuously formed inside the carrier to realize synchronous nitrification and denitrification and short-range denitrification.

The hydrolytic acidification zone and the contact oxidation zone are separated by a partition, and their bottoms are connected. There is an aeration device at the bottom of the contact oxidation zone. The aeration head adopts a rotary aerator, which performs oxygenation and aeration in the form of multi-layer spiral cutting. The air flow is cut in multiple layers to form micro-bubbles and improve the utilization rate of oxygen. , has the characteristics of uniform aeration and high oxygenation efficiency.

The contact oxidation zone and the high-efficiency precipitation zone, and the high-efficiency precipitation zone and the post-installed sulfur autotrophic denitrification filter are respectively separated by partitions, and the upper parts thereof are communicated with each other through pipelines.

The bottom of the high-efficiency sedimentation area is a sludge hopper, and the bottom of the sludge hopper is a funnel-type sewage outlet. A sludge return pipeline 18 is arranged at the sewage outlet. A sludge return pump 19 is installed on the pipeline, and the sludge return pipeline is connected to Entrance to the hydrolytic acidification zone. The top of the high-efficiency sedimentation zone is longitudinally arranged with a center guide cylinder 7, one side of the center guide cylinder is connected to the liquid outlet of the contact oxidation zone, the top of the center guide cylinder is fixed on the top of the equipment, and the bottom of the center guide cylinder is open. The opening communicates with the sludge hopper, and the material flowing into the central guide tube from the contact oxidation zone flows from the sludge hopper sewage outlet to the sludge return pipeline to the hydrolysis and acidification zone; the inclined pipe filler 6 is arranged in the middle of the high-efficiency sedimentation tank, and the sludge hopper 0.6-1 meter above the top, the height of the inclined tube packing is about 0.88 meters, which is used for filtration. The central tube water distribution method of the vertical flow sedimentation tank and the design of the mud bucket combined with the honeycomb inclined tube filler of the inclined tube sedimentation tank are similar to the simplified version of the high-density sedimentation tank, which can greatly increase the surface load of the sedimentation tank and reduce the volume of the sedimentation tank, thereby Realize the volume reduction of the overall equipment and reduce the manufacturing cost.

A return pipeline 17 is arranged above the rear sulfur autotrophic denitrification filter, the inlet of the return pipeline is connected with the rear sulfur autotrophic denitrification filter, and the outlet is connected with the hydrolytic acidification area; an internal return pump is provided on the pipeline twenty one. In the rear sulfur autotrophic denitrification filter, the filter backwash sump, the filter V-shaped distribution tank, the sulfur autotrophic filter biological filler and the filter supporting layer are arranged in sequence from top to bottom.

The sulfur autotrophic filter biological filler is installed above the supporting layer, and the filler height is about 1.2 meters; S/Fe sulfur autotrophic biological filler is used; the hydraulic load design value is 0.5-3m3/m2 h; the pH is controlled at 7-8; Dissolved oxygen is less than 0.5mg/L. The V-shaped filter water tank 10 of the filter and the filter backwash sump 13 ^are sequentially arranged on the biofiller ¹⁰ of the sulfur autotrophic filter. This part of the elements reacts chemically, and N is effectively reduced. It is suitable for the treatment of domestic sewage with low C/N ratio. The denitrification effect is stable, and the denitrification system is avoided. Reuse for green irrigation, etc. A water outlet 14 is provided on the lower side of the rear sulfur autotrophic denitrification filter, and a filter supporting layer 11 is laid horizontally above the water outlet, and filter plates and filter heads are arranged on this layer to block the filler, and the filter The support layer holds the packing, and the liquid seeps downward from the filter support layer.

A backwash water inlet and an air inlet are provided at the inner bottom of the rear sulfur autotrophic denitrification filter, and the air delivery pipeline 16 is respectively connected with the air inlet at the bottom of the contact oxidation zone and the air inlet of the rear sulfur autotrophic denitrification filter , the backwash inlet water is connected with the backwash water inlet. The post-installed sulfur autotrophic denitrification filter uses a special filter material, and the substances contained in it, such as S ^{2 -} , Fe, Fe ²⁺ , etc., are used as electron donors for nitrate reduction and are denitrified by autotrophic denitrification Bacteria use and finally converted into gaseous nitrogen, so as to achieve the removal of total nitrogen; the autotrophic denitrification process does not require additional organic carbon sources.

The invention adopts PLC automatic control, and each liquid level and flow sensor transmits 4-20mA signals, and automatically controls the water inlet pump, aeration system, return pump, sludge pump, and sulfur autotrophic filter under the preset PLC program. Start and stop of power units such as backwashing water in and out, air backwashing, and automatic valves. Realize the whole process of automatic control operation, with a high degree of automation. At the same time, it is equipped with a mobile Internet of Things gateway to realize remote control and data transmission.

Working process of the present invention:

The sewage enters the integrated reaction device from the water inlet (1-water inlet), and passes through the 2-hydrolysis acidification zone (control the dissolved oxygen concentration close to 0mg/L), and the 3-contact oxidation zone (control the dissolved oxygen concentration 2-3mg/L ) to carry out the first-stage biochemical reaction, and carry out mud-water separation in the 4-high-efficiency sedimentation zone (control the sludge return ratio of 50%-100%), and the effluent flows through the 12-filter V-shaped distribution tank into the 5-post autotrophic desulfurization Nitrogen filter, the autotrophic denitrifying bacteria in the filter use the substances contained in the biological filler of the 10-sulfur autotrophic filter, such as S ^{2 -} , Fe, Fe ²⁺ , etc., as electron donors for nitrate reduction, and finally converted into gaseous nitrogen, thereby realizing the removal of total nitrogen; the autotrophic denitrification process does not require additional organic carbon sources; The 15-backwash water inlet and 16-air delivery pipeline are carried out according to the program set by the PLC, and the backwash effluent is collected by the 13-filter backwash sump, and returned to 2- through the 17-filter backwash water return pipeline Hydrolytic acidification zone.

The invention is a post-installed sulfur autotrophic denitrification integrated domestic sewage treatment equipment, which is made of carbon steel as a whole and installed in a skid-mounted manner. The equipment is simple to manufacture, occupies a small area, is simple to install and use, and has a good removal effect on total nitrogen. Stable and efficient. The components are all connected, but the components are separated by steel plates, and the sewage flows from the previous device to the next device. The invention is composed of hydrolysis acidification zone, contact oxidation zone, high-efficiency sedimentation zone and rear sulfur autotrophic denitrification filter, supplemented by aeration device, MBBR biological filler, sulfur autotrophic filter biological filler, filter support Layer, backwashing and blowing system and high-efficiency inclined tube packing, etc., adopt post-denitrification, cancel pre-denitrification, and do not set up a nitrifying liquid return device separately to increase the system residence time. Post-denitrification adopts sulfur autotrophic denitrification filter to remove total nitrogen, no need to add carbon source, high efficiency, energy saving, environmental protection, high-efficiency sedimentation zone for mud-water separation, the present invention has the advantages of simple manufacture, convenient installation, and small footprint Small; suitable for the treatment of domestic sewage with low C/N ratio, the denitrification effect is stable, avoiding the dependence of the denitrification system on external carbon sources, and the treated sewage can be stably discharged up to the standard, and can also be reused for green irrigation.

The above description is only a preferred embodiment of the present invention, but the present invention is not limited to the above examples, as long as it achieves the technical effect of the present invention by any same or similar means, it should fall within the protection scope of the present invention.

Claims (6)

1. The integrated domestic sewage treatment equipment for the rear-mounted sulfur autotrophic nitrogen removal comprises a hydrolysis acidification area, a contact oxidation area, a high-efficiency sedimentation area and a rear-mounted sulfur autotrophic nitrogen removal filter tank, wherein sewage sequentially passes through the hydrolysis acidification area, the contact oxidation area, the high-efficiency sedimentation area and the rear-mounted sulfur autotrophic nitrogen removal filter tank through a water inlet, the hydrolysis acidification area and the contact oxidation area are separated by a partition plate, and the bottoms of the hydrolysis acidification area and the contact oxidation area are communicated, and the integrated domestic sewage treatment equipment is characterized in that a liquid outlet of the contact oxidation area is arranged at the upper right side of the contact oxidation area and is connected with a liquid inlet of a central guide cylinder, and a liquid outlet of the central guide cylinder is vertically downward;

a liquid inlet between the high-efficiency sedimentation area and the rear sulfur autotrophic denitrification filter is arranged at the upper right side of the high-efficiency sedimentation area, and is connected with a V-shaped water distribution groove of the filter; a sludge return pipeline is arranged at the bottom of the efficient sedimentation zone and is connected back to the hydrolysis acidification zone;

in the postpositive sulfur autotrophic denitrification filter, a filter backwash water collecting tank, a filter V-shaped water distribution tank, a sulfur autotrophic filter biological filler and a filter supporting layer are sequentially arranged from top to bottom; a return pipeline is arranged on the right side of the backwash water collecting tank of the filter tank and is connected back to the hydrolysis acidification area;

the bottom in the post sulfur autotrophic nitrogen removal filter is provided with a backwash water inlet and an air inlet, and an air conveying pipeline is respectively connected with the air inlet at the bottom of the contact oxidation zone and the air inlet of the post sulfur autotrophic nitrogen removal filter;

biological fillers are respectively filled in the hydrolysis acidification area, the contact oxidation area, the high-efficiency sedimentation area and the post sulfur autotrophic denitrification filter.

2. The post-sulfur autotrophic nitrogen removal integrated domestic sewage treatment device according to claim 1, wherein a water outlet is arranged on the right side of the lower part of the post-sulfur autotrophic nitrogen removal filter tank.

3. The post-sulfur autotrophic nitrogen removal integrated domestic sewage treatment device according to claim 1, wherein the bottom in the efficient sedimentation area is a sludge hopper, the bottom of the sludge hopper is a funnel-shaped sewage outlet, the top of the central guide cylinder is fixed at the inner top of the device, the cylinder body of the central guide cylinder is vertically downward, one side of the cylinder body is connected with the liquid outlet of the contact oxidation area, the opening at the bottom of the cylinder body is downward, and substances in the cylinder body from the contact oxidation area to the central guide cylinder flow out of the sludge hopper; and the middle part in the efficient sedimentation zone is also provided with a pipe chute filler.

4. The post-sulfur autotrophic nitrogen-removing integrated domestic sewage treatment apparatus according to claim 1, wherein an aeration device is provided at the bottom in the contact oxidation zone.

5. The post-sulfur autotrophic nitrogen removal integrated domestic sewage treatment device according to claim 1, wherein the contact oxidation area and the high-efficiency sedimentation area, the high-efficiency sedimentation area and the post-sulfur autotrophic nitrogen removal filter are respectively separated by a partition plate, and the upper parts of the contact oxidation area and the high-efficiency sedimentation area are respectively communicated.

6. The post sulfur autotrophic nitrogen removal integrated domestic sewage treatment apparatus of claim 1, wherein said hydrolytic acidification zone is an anoxic zone.

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