Background
The on-site treatment of domestic sewage of single family has many advantages, especially suitable for use in the areas with dispersed living, such as villages. In this regard, a small purification tank from japan is a typical case. However, the treatment capacity of the minimumtank design in japan is 1 ton/day, and the discharge of most rural households in our country is significantly less than 1 ton/day, so that the development of a single household sewage treatment apparatus suitable for smaller-scale discharge is urgently required.
In order to solve the above-mentioned demand problems, a batch of single-family sewage treatment apparatuses simulating purification tanks and reducing the volume thereof has appeared on the domestic market to meet the demand for rural sewage treatment, and the batch of apparatuses has the following two problems in the aspect of total nitrogen removal of sewage: 1) the single-stage anoxic-aerobic (A/O) process realizes the subsequent denitrification by only depending on the process that the sludge nitrification liquid in the settling zone flows back to the water inlet stabilizing zone, and the relationship between the reflux quantity, the total nitrogen removal quantity and the overall operation effect of the device is difficult to balance, so that the denitrification effect of the device is poor, and the total nitrogen of the outlet water cannot reach the discharge standard set by the device; 2) compare in other functional areas, the great intake stable region of volume and anoxic zone make organic carbon source in the domestic sewage that organic carbon and total nitrogen ratio are just low originally not by denitrification fully utilized, but by simple consumption, lead to the denitrogenation effect of device not good.
To solve the above problems, 2 derived forms of the a/O process appear in the market units and development processes: multi-stage A/O process and multi-stage water inlet process. The multistage A/O process is to split the anoxic and aerobic functional zones into a plurality of small units and to arrange the small units in a crossed manner under the condition that the volume of the device is not changed, for example, the publication number CN106630478A, Chinese patent named as a distributed sewage treatment device and a method for treating sewage by using the same seems to realize the full utilization of organic carbon and improve the denitrification degree, but the process has the following two problems: 1) although the multi-stage A/O does not shorten the retention time of large-particle substances in the sewage in the anoxic functional zone, the large-particle substances in the aerobic functional zone which is arranged in a crossed way cannot be consumed, and the denitrification reaction is difficult to denitrify by using granular organic matters as an organic carbon source; 2) the difficulty of treating pollutants in the aerobic functional zone is increased, and the risk of biological system breakdown exists.
The multistage technology of intaking distributes the functional area of receiving into water, directly flows into the oxygen deficiency functional area that has the demand to organic carbon source with partly intaking to realize the make full use of to organic carbon source, as the patent: (CN10812896A), this process also has 2-point problems: 1) the retention time of the sewage entering from the non-process starting point in the device is shortened, the treatment effect is reduced, and the water distribution of multi-section inflow water is limited; 2) the large-particle pollutants which can be removed only through the process of sedimentation or floating in the inlet water are more, so that the pollutants are difficult to be utilized by denitrification reaction, and the treatment load of an anoxic functional zone is increased.
Disclosure of Invention
In order to solve the technical problems, the invention aims to provide a household sewage treatment device with good denitrification effect and low energy consumption.
The invention relates to a household sewage treatment device, which comprises an outer barrel body and an inner barrel body arranged in the outer barrel body, wherein the top of the outer barrel body is provided with an opening, the bottom of the inner barrel body is fixedly arranged on the bottom wall of the outer barrel body, the inner cavity of the outer barrel body is divided into a stable area positioned in the inner barrel body and an annular area positioned between the outer barrel body and the inner barrel body by the barrel wall of the inner barrel body, a plurality of partition plates are arranged in the annular area, one side of each partition plate is tightly connected with the inner barrel body, the other side of each partition plate is tightly connected with the inner barrel body, the annular area is divided into a first anoxic area, a first aerobic area, a second anoxic area, a second aerobic area and a settling area which are sequentially arranged around the inner barrel body by the plurality of partition plates, an overflow plate is further arranged in the first anoxic area, two ends of the overflow plate are respectively connected with adjacent partition plates, the outer side of the overflow plate is tightly connected with the, The overflow weir, the outer barrel body and the partition plate adjacent to the overflow plate are surrounded to form an overflow area positioned at the upper part of the first anoxic area, the top of the partition plate positioned between the first anoxic area and the first aerobic area is provided with a notch communicated with the overflow area and the first aerobic area, the upper part of the first aerobic area is also provided with an overflow groove communicated with the overflow area and the second anoxic area, the bottom of the partition plate positioned between the first aerobic area and the second anoxic area is provided with a first perforation communicated with the first aerobic area and the second anoxic area, the top of the partition plate positioned between the second anoxic area and the second aerobic area is provided with a second perforation communicated with the second anoxic area and the second aerobic area, the bottom of the partition plate positioned between the second aerobic area and the sedimentation area is provided with a third perforation communicated with the second aerobic area and the sedimentation area, the side wall of the outer barrel body is also provided with a water outlet pipe communicated with the sedimentation area, the household sewage treatment device further comprises a water inlet pipe communicated with the stable area, the lateral wall of the inner cylinder body is also provided with an overflow hole communicated with the stabilizing zone and the first anoxic zone, the first aerobic zone, the second anoxic zone and the second aerobic zone are respectively provided with an aeration pipe, the first anoxic zone and the second anoxic zone are respectively provided with a reticular biological filler, and the first aerobic zone and the second aerobic zone are respectively provided with a biological suspension ball filler.
Furthermore, the household sewage treatment device is characterized in that a mesh plate and an air-stripping reflux device are arranged in the settling zone, the input end of the air-stripping reflux device penetrates through the mesh plate and extends below the mesh plate, and the output end of the air-stripping reflux device is communicated with the stabilizing zone.
Furthermore, one end of the water inlet pipe penetrates through the side walls of the outer barrel body and the inner barrel body respectively and is communicated with the stable area.
Furthermore, the top end of the overflow weir of the household sewage treatment device is zigzag.
Furthermore, the top of the outer barrel body of the household domestic sewage treatment device is provided with a top cover.
By the scheme, the invention at least has the following advantages: according to the household sewage treatment device, the overflow groove is arranged between the overflow area, namely the upper part of the first anoxic area, and the second anoxic area, so that the sewage in the first anoxic area can flow into the second anoxic area through the overflow groove, a carbon source is supplemented for the second anoxic area, and the sewage treatment effect is further improved.
In conclusion, the household sewage treatment device has good denitrification effect and low energy consumption.
The foregoing description is only an overview of the technical solutions of the present invention, and in order to make the technical solutions of the present invention more clearly understood and to implement them in accordance with the contents of the description, the following detailed description is given with reference to the preferred embodiments of the present invention and the accompanying drawings.
Detailed Description
The following detailed description of embodiments of the present invention is provided in connection with the accompanying drawings and examples. The following examples are intended to illustrate the invention but are not intended to limit the scope of the invention.
Referring to fig. 1 to 3, the household sewage treatment device according to a preferred embodiment of the present invention comprises an outer barrel 1 and an inner barrel 2 disposed in the outer barrel, wherein the top of the outer barrel has an opening, the bottom of the inner barrel is fixedly disposed on the bottom wall of the outer barrel, the inner chamber of the outer barrel is divided into a stable region 3 disposed in the inner barrel by the barrel wall of the inner barrel, and an annular region disposed between the outer barrel and the inner barrel, a plurality of partition plates 4 are disposed in the annular region, one side of each partition plate is tightly connected to the outer barrel, the other side of each partition plate is tightly connected to the inner barrel, the plurality of partition plates divide the annular region into a first anoxic region 5, a first aerobic region 6, a second anoxic region 7, a second aerobic region 8 and a settling region 9, which are sequentially disposed around the inner barrel, an overflow plate 10 is further disposed in the first anoxic region, two ends of the overflow plate are respectively connected to adjacent partition plates, the outer side of the overflow plate is tightly, an overflow weir 11 fixedly connected with the overflow plate is arranged on the inner side of the overflow plate, the overflow weir, the outer barrel body and a partition plate adjacent to the overflow plate are surrounded to form an overflow area 12 positioned on the upper part of a first anoxic area, a gap 14 communicated with the overflow area and the first aerobic area is arranged at the top part of the partition plate positioned between the first anoxic area and the first aerobic area, an overflow groove 15 communicated with the overflow area and a second anoxic area is also arranged on the upper part of the first aerobic area, a first perforation (not shown in the figure) communicated with the first aerobic area and the second anoxic area is arranged at the bottom part of the partition plate positioned between the first anoxic area and the second aerobic area, the first perforation can be formed by a gap between the partition plate and the bottom wall of the outer barrel body, a second perforation 16 communicated with the second anoxic area and the second aerobic area is arranged at the top part of the partition plate positioned between the second anoxic area and the second aerobic area, a third perforation (not shown in the figure) communicated with the second aerobic area and a precipitation area is arranged at the bottom part of the partition plate positioned between the second aerobic area and the precipitation, the structure of the device is similar to that of the first perforation, the side wall of the outer barrel body is further provided with a water outlet pipe 17 communicated with the settling zone, the household domestic sewage treatment device further comprises a water inlet pipe 18 communicated with the stabilization zone, the side wall of the inner barrel body is further provided with an overflow hole 19 communicated with the stabilization zone and the first anoxic zone, the first aerobic zone, the second anoxic zone and the second aerobic zone are respectively provided with an aeration pipe (not shown in the figure), the first anoxic zone and the second anoxic zone are respectively provided with a reticular biological filler (not shown in the figure), the first aerobic zone and the second aerobic zone are respectively provided with a biological suspension ball filler (not shown in the figure).
In the household sewage treatment device, the overflow area, namely the overflow groove is arranged between the upper part of the first anoxic area and the second anoxic area, so that the sewage in the first anoxic area can flow into the second anoxic area through the overflow groove, thereby supplementing a carbon source for the second anoxic area, further improving the sewage treatment effect, and the specific working process is described as follows:
domestic sewage including toilet sewage, washing and bathing sewage, washing sewage, kitchen sewage and the like directly flows into the stable area through the water inlet pipe. The floating of floating slag and the sinking of large-particle pollutants in the sewage are completed by the sewage in the stable area through a period of time, and the water quality stabilizing process of hydrolyzing the particle pollutants into soluble pollutants, acidifying the large-molecular pollutants to form small-molecular pollutants and the like and the denitrification process are completed under the action of anaerobic and anoxic microorganisms. The treated water flows into the first anoxic zone through the overflow hole;
the middle part of the first anoxic zone is filled with the three-dimensional reticular biological filler, under the combined action of suspended sludge and a biological film attached to the surface of the reticular biological filler, granular pollutants in the sewage are further intercepted, macromolecular pollutants are further hydrolyzed and acidified, and the treated sewage uniformly flows into the overflow zone and flows into an overflow groove communicated with the overflow zone and the first aerobic zone under the action of an overflow weir at the upper part of the zone.
After the sewage enters the first aerobic zone, the sewage is subjected to organic matter degradation and ammonia nitrogen oxidation under the combined action of suspended sludge and a biological membrane attached to the surface of a biological suspended ball filler, and in the process, part of organic matters are adsorbed, oxidized and decomposed to be converted into CO2Discharging the other part of the wastewater to undergo anabolism for the proliferation of microorganisms, and allowing the treated water to enter a second anoxic zone through the perforations at the bottom of the partition plate. Due to the interception effect of the biological membrane, the first aerobic zone has higher microorganism concentration, so that the removal rate of pollutants is improved;
after the sewage enters the second anoxic zone, under the combined action of anaerobic and facultative anaerobic microorganisms attached and grown on the surfaces of suspended sludge and the reticular biological filler, the degradation and denitrification of organic matters are further carried out, partial microorganisms from the first aerobic zone die gradually due to the lack of oxygen to release intracellular substances, meanwhile, extracellular enzymes secreted by the anaerobic microorganisms grown in the second anoxic zone can promote the degradation of the partial microorganisms to be converted into new organic matters, so that a carbon source is supplemented for denitrification, the second anoxic zone also accommodates the sewage flowing in from the first anoxic zone through the overflow tank, the carbon source required by denitrification reaction of the zone is further supplemented, and the denitrification effect of the device is enhanced. The treated water enters a second aerobic zone through an overflow hole at the upper part of the clapboard;
the process of sewage treatment by the second aerobic zone is similar to that of the first aerobic zone, but most organic matters are removed after the sewage is treated by the stabilizing zone, the first anoxic zone, the first aerobic zone and the second anoxic zone, and nitrification reaction mainly occurs in the second aerobic zone so as to fully remove ammonia nitrogen. The treated water flows into the settling zone from the perforations at the bottom of the partition plate;
in the sedimentation zone, on the one hand, a small amount of suspended solids contained in the water is removed by sedimentation and discharged from the outlet pipe; on the other hand, the upper part of the settling zone can be provided with a gas stripping reflux device, and the gas stripping reflux device can lift residual sludge or fallen biological membranes and nitrifying liquid generated in the process to the stabilizing zone through the gas stripping action.
The overflow groove is formed by surrounding a bottom plate and side plates at two sides, one end of the overflow groove is positioned at the notch of one partition plate, and the other end of the overflow groove is positioned at the positioning groove of the adjacent partition plate.
Preferably, the household sewage treatment device is characterized in that a mesh plate 20 and an air-stripping reflux device 21 are arranged in the settling zone, the input end of the air-stripping reflux device penetrates through the mesh plate and extends below the mesh plate, and the output end of the air-stripping reflux device is communicated with the stabilizing zone.
The arrangement of the gas stripping reflux device enables the household domestic sewage treatment device to reflux the sludge and the digestive juice in the settling zone through the gas stripping reflux device. The system may control the amount of reflux by controlling the flow of gas.
Preferably, one end of the water inlet pipe penetrates through the side walls of the outer barrel body and the inner barrel body respectively and is communicated with the stable area.
Preferably, the top end of the overflow weir of the household sewage treatment device is zigzag.
The zigzag overflow weir can prevent sludge from flowing into the outer annular region
Preferably, in the household sewage treatment device of the present invention, a top cover (not shown) is disposed on the top of the outer tub.
The arrangement of the top cover can prevent the odor emitted by the sewage from polluting the surrounding environment.
It will be evident to those skilled in the art that the invention is not limited to the details of the foregoing illustrative embodiments, and that the present invention may be embodied in other specific forms without departing from the spirit or essential attributes thereof. The present embodiments are, therefore, to be considered in all respects as illustrative and not restrictive, the scope of the invention being indicated by the appended claims rather than by the foregoing description.
In addition, the above is only a preferred embodiment of the present invention, and is not intended to limit the present invention, it should be noted that, for those skilled in the art, several modifications and variations can be made without departing from the technical principle of the present invention, and these modifications and variations should also be regarded as the protection scope of the present invention. Also, it should be understood that although the present description refers to embodiments, not every embodiment may contain only a single embodiment, and such description is for clarity only, and those skilled in the art should integrate the description, and the embodiments may be combined as appropriate to form other embodiments understood by those skilled in the art.