CN109354343B - Sewage treatment system and sewage treatment method by utilizing sludge fermentation of primary sedimentation tank - Google Patents

Sewage treatment system and sewage treatment method by utilizing sludge fermentation of primary sedimentation tank Download PDF

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CN109354343B
CN109354343B CN201811548303.1A CN201811548303A CN109354343B CN 109354343 B CN109354343 B CN 109354343B CN 201811548303 A CN201811548303 A CN 201811548303A CN 109354343 B CN109354343 B CN 109354343B
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sludge
tank
tank body
fermentation
sewage treatment
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CN109354343A (en
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李永秋
修兆子
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Qingdao Chongjie Yichen Environmental Protection Co ltd
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Qingdao Mubang Environmental Technology Co ltd
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    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F9/00—Multistage treatment of water, waste water or sewage
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F11/00—Treatment of sludge; Devices therefor
    • C02F11/02—Biological treatment
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F1/00—Treatment of water, waste water, or sewage
    • C02F1/001—Processes for the treatment of water whereby the filtration technique is of importance
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F1/00—Treatment of water, waste water, or sewage
    • C02F1/50—Treatment of water, waste water, or sewage by addition or application of a germicide or by oligodynamic treatment
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F1/00—Treatment of water, waste water, or sewage
    • C02F1/52—Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F1/00—Treatment of water, waste water, or sewage
    • C02F2001/007—Processes including a sedimentation step
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F2103/00—Nature of the water, waste water, sewage or sludge to be treated
    • C02F2103/001—Runoff or storm water
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F2209/00—Controlling or monitoring parameters in water treatment
    • C02F2209/04—Oxidation reduction potential [ORP]
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F2209/00—Controlling or monitoring parameters in water treatment
    • C02F2209/40—Liquid flow rate
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F3/00—Biological treatment of water, waste water, or sewage
    • C02F3/02—Aerobic processes
    • C02F3/06—Aerobic processes using submerged filters

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  • Engineering & Computer Science (AREA)
  • Environmental & Geological Engineering (AREA)
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Abstract

The invention provides a sewage treatment system by utilizing sludge fermentation of a primary sedimentation tank, which comprises: the system comprises a grid, a grit chamber, a reinforced primary sedimentation tank, an aeration biological filter tank, a disinfection tank and a biological fermentation device, wherein sludge generated by the reinforced primary sedimentation tank is conveyed to the biological fermentation device, and fermentation liquor generated by the biological fermentation device is conveyed to the reinforced primary sedimentation tank and then enters the aeration biological filter tank; the biological fermentation device comprises: the sludge storage tank is arranged at the bottom of the tank body, and a sludge outlet is formed in the side wall or the bottom of the sludge storage tank; the upper part of the tank body is provided with a sludge inlet, a water inlet and a liquid outlet; a sludge inlet pipe array and a water inlet pipe array are arranged in the tank body, and a liquid outlet groove and a slag stopping plate circular ring are arranged at the top of the side wall of the tank body; the tank body is provided with a stirring claw. The sewage treatment system utilizing primary sludge fermentation of the invention ferments the sludge generated in the primary sedimentation tank, and the generated fermentation liquid can be used as a carbon source, so that an external carbon source is not required to be added, and the cost is saved. The invention also provides a sewage treatment method.

Description

Sewage treatment system and sewage treatment method by utilizing sludge fermentation of primary sedimentation tank
Technical Field
The invention relates to the technical field of sewage treatment, in particular to a sewage treatment system and a sewage treatment method by utilizing sludge fermentation of a primary sedimentation tank.
Background
The discharge amount of urban sewage in China is increased sharply, and water pollution is increased continuously. Because eutrophication phenomenon caused by excessive accumulation of nitrogen and phosphorus in natural water body is continuously outbreaked, in order to solve the problem of increasingly serious water pollution, national puts forward more strict requirements on effluent nitrogen and phosphorus indexes in the primary A standard in the discharge Standard of pollutants for municipal wastewater treatment plant GB18918-2002 which is implemented from 7/1/7/2003, the total nitrogen content (TN) is less than 15mg/l, and the total phosphorus content (TP) is less than 0.5 mg/l.
Because the C/N ratio of urban sewage in China is generally lower, and the effect of a primary sedimentation tank in the sewage treatment process is added, the C/N ratio of the sewage entering a biochemical tank is further reduced, and the carbon source is insufficient and the competitive contradiction caused by the insufficient carbon source causes that the denitrification and the dephosphorization cannot achieve ideal effects. Therefore, at present, most municipal sewage treatment plants with the nitrogen and phosphorus removal functions in China hardly meet the requirements of the first-class A discharge standard on the nitrogen and phosphorus of effluent under the condition that external carbon sources are not added.
For most urban sewage treatment systems, the lack of organic carbon sources is the main reason for the failure to improve the nitrogen and phosphorus removal efficiency. At present, external carbon sources such as methanol, acetic acid and even glucose are generally added to improve the biological denitrification effect; chemical agents such as ferrous sulfate, polychlorinated chlorine and the like are added to improve the chemical phosphorus removal effect. The method which depends on the additional addition of carbon sources and medicaments has the biggest defects of higher cost, high sludge yield, limited sludge resource (phosphate fertilizer) and other negative effects.
Fig. 1 shows a typical example of a conventional sewage treatment system, in which domestic sewage is treated in sequence by a grid 1, a grit chamber 2, a strengthening primary sedimentation tank 3, a biological aerated filter (generally referred to as BAF, including CN and DN) 4, and a disinfection tank 5, and then reaches a first-class a discharge standard.
The sewage to be treated is firstly strained by the grating 1, and large floating objects and suspended matters in the sewage are intercepted.
The sewage is inevitably mixed into the silt in the migration, flow and collection processes. If the sand in the sewage is not removed by settlement separation in advance, the operation of subsequent treatment equipment is influenced, and most importantly, a pump of a machine is abraded, a pipe network is blocked, and the biochemical treatment process is interfered and even damaged. The grit chamber is mainly used for removing sand grains with the grain diameter of more than 0.2mm and the density of more than 2.65 t/cubic meter in sewage so as to protect pipelines, valves and other facilities from abrasion and blockage. The grit chamber has various forms, and mainly comprises an aeration grit chamber, a rotational flow grit removal chamber and the like.
The primary sedimentation tank is an indispensable link in most of the sewage treatment plants in China at present, urban sewage is pretreated through the primary sedimentation tank, suspended matters, organic matters and the like in the sewage can be removed, and the impact of water quality fluctuation on a subsequent biochemical treatment link in the biological aerated filter is reduced. The primary sedimentation tank is removing
Figure BDA0001909937280000021
At the same time reduce suspended substances
Figure BDA0001909937280000022
The organic matter (COD) load, and further the loss of the organic carbon source.
The reinforced primary sedimentation tank is formed by adding chemical agents (aluminum salt, ferric salt and PAM) to reinforce the suspension of sewage in the primary sedimentation tank on the basis of the primary sedimentation tankThe removal effect of the floating matters, the organic matters and the total phosphorus is reduced, thereby reducing the removal effect of the suspended matters (SS) and the organic matters (COD load) of the subsequent aeration biological filter tank and strengthening the primary sedimentation tank
Figure BDA0001909937280000023
Suspensions and
Figure BDA0001909937280000024
organic matter (COD) and 80-95% of total phosphorus. It can be seen that the higher removal rate of organic matters also causes the loss of organic carbon sources, which causes the shortage of denitrification carbon sources in the subsequent biological aerated filter.
A Biological Aerated Filter (BAF) is a new sewage treatment process developed on the basis of a common biological filter in the late 80 th century. The aeration biological filter tank integrates biological removal of organic matters, total nitrogen and interception of suspended solids, saves a subsequent secondary sedimentation tank and simplifies the treatment process. However, the biological aerated filter process has high requirements on the quality of inlet water, especially Suspended Solids (SS) in the water. Once the content of the suspended matters in the inlet water is too high, the biological aerated filter is easy to block, so that the raw water needs to be pretreated to reduce the content of the suspended matters in the inlet water. The reinforced primary sedimentation tank added with chemical agents is used as a preposed pretreatment unit of the biological aerated filter. In the pretreatment process, a large amount of organic matters (COD) in the raw water are removed, so that the subsequent denitrification carbon source is insufficient, and an external carbon source is required to be added to supplement the organic matters in the subsequent denitrification process, so that the operation cost is increased. The aeration biological filter also has no phosphorus removal effect, and needs to adopt a reinforced primary sedimentation tank with a chemical agent added in front to complete phosphorus removal so as to meet the requirement that the effluent reaches the national first-class A discharge standard.
The organic carbon source in the sewage is ideal and the most economic, the reinforced sludge in the primary sedimentation tank contains up to 80 percent of organic matters (COD), the effect of the primary sedimentation tank is exerted, the organic carbon is not lost, the carbon source in the sewage is used for the denitrification link of the subsequent aeration biological filter, the biological denitrification efficiency is improved, and the method is a problem to be solved urgently in the design and operation of the current urban sewage treatment system.
Disclosure of Invention
The invention provides a sewage treatment system and a sewage treatment method by utilizing sludge fermentation of a primary sedimentation tank, which solve the problems that the existing sewage treatment system of a municipal sewage treatment plant strengthens the primary sedimentation tank, reduces organic matter load, reduces carbon sources and needs to add external carbon sources in the biochemical treatment link of a subsequent aeration biological filter.
The technical scheme of the invention is realized as follows:
according to a first aspect of the present invention, a sewage treatment system utilizing primary sludge fermentation is presented.
In this alternative embodiment, the sewage treatment system using primary sludge fermentation includes: the system comprises a grating 1, a grit chamber 2, a reinforced primary settling tank 3, an aeration biological filter 4, a disinfection tank 5 and a biological fermentation device 6, wherein sludge generated by the reinforced primary settling tank 3 is conveyed to the biological fermentation device 6 for fermentation, and fermentation liquor generated by the biological fermentation device 6 is conveyed to the reinforced primary settling tank 3.
Optionally, the biological fermentation device 6 comprises: the sludge storage tank comprises a tank body 11, wherein the bottom 12 of the tank body is of an inverted cone structure, a sludge storage hopper 13 is arranged at the bottom of the tank body, and a sludge outlet 17 is formed in the side wall or the bottom of the sludge storage hopper; the upper part of the tank body is provided with a sludge inlet 14, a water inlet 15 and a liquid outlet 16;
a sludge inlet pipe array 31 is arranged in the tank body, the sludge inlet pipe array comprises a plurality of upright sludge inlet pipes 18, sludge is discharged from the bottoms of the sludge inlet pipes, the tops of the sludge inlet pipes are connected with a first main pipe 19, and the first main pipe 19 is connected with the sludge inlet 14;
a water inlet pipe array 32 is further arranged in the tank body, the water inlet pipe array comprises a plurality of vertical water inlet pipes 20, water is discharged from the bottoms of the water inlet pipes, the tops of the water inlet pipes are connected with a second main pipe 21, and the second main pipe 21 is connected with the water inlet 15;
a circle of liquid outlet groove 22 is formed in the top of the side wall of the tank body, the liquid outlet groove 22 is of a U-shaped structure, one or more water outlets 23 for collecting fermentation liquid are formed in the bottom of the liquid outlet groove, and the water outlets 23 are connected to the liquid outlet 16 through pipelines; a slag blocking plate circular ring 38 consisting of a circle of vertical slag blocking plates 24 is further arranged at the top of the tank body, the diameter of the slag blocking plate circular ring 38 is smaller than that of the liquid outlet tank, and a gap of 10-20cm is kept between the slag blocking plate circular ring and the liquid outlet tank; the upper edge of the slag blocking plate is 10-30cm higher than the upper edge of the liquid outlet groove, the lower edge of the slag blocking plate is 5-20cm lower than the upper edge of the liquid outlet groove, and the height of the slag blocking plate is 30-50 cm;
the tank body is also provided with a stirring claw 25, the stirring claw is driven to rotate by a rotating shaft 26 at the center of the tank body, a driving device of the rotating shaft is arranged at the top of the tank body, the bottom of the stirring claw is provided with a transverse tooth 27 which is of an inverted cone structure and is matched with the bottom of the tank body, the transverse tooth is provided with a plurality of upright vertical teeth 28, and the upright teeth 28, the water inlet pipe 20 and the sludge inlet pipe 18 are arranged in a staggered manner.
Optionally, the mud inlet pipe array 31 is a straight-line array.
Optionally, the number of the mud inlet pipe arrays 31 is multiple, and the multiple mud inlet pipe arrays are arranged in a staggered manner.
Optionally, the water inlet array 32 is a straight array.
Optionally, the number of the water inlet pipe arrays 32 is multiple, and the multiple water inlet pipe arrays are staggered.
Optionally, the water inlet pipe array 32 and the sludge inlet pipe array 31 are staggered.
Optionally, the vertical tooth is of an L-shaped structure, and a tip of the vertical tooth faces to the rotation direction.
Optionally, the device further comprises a mud scraper 29 which is a symmetrical blade structure, and the mud scraper 29 is arranged in the mud storage hopper below the stirring claw 25 and is coaxial with the stirring claw.
Optionally, a pipe orifice at the bottom of the sludge outlet pipe 18 is a first sludge inlet 33, and a plurality of second sludge inlets 34 are further disposed on the side wall of the pipe orifice of the sludge inlet pipe.
Optionally, the aperture of the first sludge inlet is 8-12 mm.
Optionally, the aperture of the second sludge inlet is 6-7 mm.
Optionally, the pipe orifice at the bottom of the water inlet pipe 20 is a first water inlet 35, and the side wall of the pipe orifice of the water inlet pipe is further provided with a plurality of second water inlets 36.
Optionally, the aperture of the first water inlet is 2-3 mm.
Optionally, the aperture of the second water inlet is 1-2 mm.
Optionally, the first sludge inlet 33 at the bottom of the sludge inlet pipe 18 is arranged at the height position of the tank 1/7-1/4, and the height of the tank is the height from the tip of the inverted cone structure at the bottom to the top of the tank.
Optionally, the first sludge inlet 33 is arranged at the height of the tank 1/5.
Optionally, the first water inlet 35 at the bottom of the water inlet pipe 20 is arranged at the height position of the tank 1/6-1/3, wherein the height of the tank is the height from the tip of the inverted cone structure at the bottom to the top of the tank.
Optionally, the first water inlet 35 is disposed at the height of the tank 1/4.
According to a second aspect of the present invention, a method for treating sewage by fermentation using primary sludge is provided.
In this alternative embodiment, the sewage treatment method is based on the sewage treatment system described in any one of the previous alternative embodiments, and includes the following steps:
controlling the sludge discharge amount of the sludge outlet according to the sludge level of the sludge in the tank body;
and controlling the water inflow of the water inlet and the sludge inlet of the sludge inlet according to the hydraulic retention time of the sludge.
Optionally, the step of controlling the mud amount of the mud outlet according to the mud level in the tank body includes:
controlling the sludge discharge amount of the sludge outlet according to the sludge age SRT of the sludge in the tank body and the sludge level of the sludge, wherein the sludge age SRT formula is as follows:
SRT＝K·H·A/q1
wherein: SRT is 5-7 days; k is the solid content of the sludge and is a fixed value; a is the cross-sectional area of the tank body; v1Is the volume of sludge, V1According to the measured sludge level H of the sludge and the tankThe cross-sectional area of the body is obtained; q. q.s1The amount of sludge discharged.
Optionally, the step of controlling the water inlet amount of the water inlet and the sludge inlet amount of the sludge inlet according to the hydraulic retention time HRT of the sludge comprises:
HRT＝V2/(q2+q3)
wherein: HRT is 12-24 hours; v2The total volume of the sludge and the fermentation liquor in the tank body; q. q.s2Is the water inflow q3The sludge feeding amount is shown.
Optionally, the wastewater treatment method further comprises: controlling the water inflow q according to the oxidation-reduction potential value of the fermentation liquor2And the mud inlet amount q3。
The invention has the beneficial effects that:
(1) in the prior art, the sludge in the primary sedimentation tank is used as waste, the sludge produced in the primary sedimentation tank is fermented, and the produced fermentation liquor is used as a carbon source for the subsequent biochemical treatment link of the biological aerated filter.
(2) The fermentation liquor produced by the biological fermentation device can be used as a carbon source for subsequent biochemical treatment links, an external carbon source is not required to be added, the cost is saved, the sludge amount of a sewage treatment plant is reduced, and the sludge treatment cost is saved.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.
FIG. 1 is a schematic block diagram of a conventional sewage treatment system;
FIG. 2 is a functional block diagram of a wastewater treatment system of the present invention;
FIG. 3 is a schematic side view of an alternative embodiment of the biological fermentation apparatus of the present invention;
FIG. 4 is a schematic top view of an alternative embodiment of the biological fermentation apparatus of the present invention;
FIG. 5 is a schematic side view of an alternative embodiment of the mud intake pipe of the present invention;
FIG. 6 is a schematic side view of an alternative embodiment of the inlet manifold of the present invention;
FIG. 7 is a flow chart of a wastewater treatment method of the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
The invention provides a sewage treatment system utilizing sludge fermentation in a primary sedimentation tank, which is used for fermenting sludge generated in the primary sedimentation tank, and the generated fermentation liquor is used as a carbon source for a subsequent biochemical treatment link.
FIG. 2 illustrates an alternative embodiment of a wastewater treatment system utilizing primary clarifier sludge fermentation.
In this alternative embodiment, the sewage treatment system using the sludge fermentation in the primary sedimentation tank includes: the system comprises a grating 1, a grit chamber 2, a reinforced primary settling tank 3, an aeration biological filter tank 4, a disinfection tank 5 and a biological fermentation device 6, wherein sludge generated by the reinforced primary settling tank 3 is conveyed to the biological fermentation device 6, and fermentation liquor generated by the biological fermentation device 6 is conveyed to the reinforced primary settling tank 3 and then enters the aeration biological filter tank 4.
The fermentation liquor produced by the primary sludge biological fermentation device is rich in short-chain fatty acids (VFAs) and is a good carbon source for biological denitrification and denitrification of the aeration biological filter. However, since the fermentation liquor contains high Suspended Solids (SS), the direct supply to the biological aerated filter can cause the blockage of the filter and increase the backwashing frequency, which can cause adverse effects on the operation of the filter. The fermentation liquor is returned to the reinforced primary sedimentation tank, so that suspended matters in the fermentation liquor can be removed, and carbon sources mainly containing short-chain fatty acids (VFAs) are reserved for the subsequent biological aerated filter.
Optionally, the sludge generated by the enhanced primary sedimentation tank 3 is conveyed to the biological fermentation device 6 through a sludge pump and a sludge guide pipe, and the fermentation liquid generated by the biological fermentation device 6 is conveyed to the enhanced primary sedimentation tank 3 through a liquid guide pipe and a water pump.
FIGS. 3 and 4 show an alternative embodiment of a biological fermentation device.
In this alternative embodiment, the biological fermentation device 6 comprises: the tank body 11, the tank body bottom 12 is the back taper structure, and the tank body bottom 12 deposits mud. The bottom 12 of the tank body is provided with a mud storage hopper 13, and the side wall or the bottom of the mud storage hopper 13 is provided with a mud outlet 17 for discharging the mud at the bottom of the tank body. In the embodiment shown in fig. 3, the sludge outlet 17 is arranged on the side wall of the sludge storage hopper 13.
The upper part of the tank body 11 is provided with a sludge inlet 14, a water inlet 15 and a liquid outlet 16.
A sludge inlet pipe array 31 is arranged in the tank body 11, the sludge inlet pipe array 31 comprises a plurality of vertical sludge inlet pipes 18, sludge is discharged from the bottoms of the sludge inlet pipes 18, the tops of the sludge inlet pipes 18 are connected with a first main pipe 19, and the first main pipe 19 is connected with a sludge inlet 14. The sludge inlet 14 receives sludge from the primary sedimentation tank, which is transported through the first main pipe 19 to the respective sludge inlet pipe 18 and distributed from the bottom of the sludge inlet pipe 18 to various locations in the tank.
Alternatively, the sludge inlet pipe array 31 is a straight-line array, i.e. the sludge inlet pipes 18 are arranged in parallel in a row.
Optionally, the number of the mud inlet pipe arrays 31 is multiple, and the multiple mud inlet pipe arrays are arranged in a staggered manner. In the embodiment shown in fig. 4, the number of the mud inlet pipe arrays 31 is two, and the two mud inlet pipe arrays 31 are vertically staggered.
Still be provided with inlet tube array 32 in jar body 11, inlet tube array 32 includes a plurality of upright inlet tubes 20, and the bottom of inlet tube 20 goes out water, and the top of inlet tube 20 is connected with second main pipe 21, and second main pipe 21 is connected with water inlet 15, and water inlet 15 inputs the elutriation water that is used for mixing the fermentation with mud. Optionally, the elutriation water is discharge water after being treated by a sewage plant or tap water of a municipal pipeline.
Alternatively, the array of inlet conduits 32 is a straight array, i.e. the individual inlet conduits 20 are arranged in parallel in a row.
Optionally, the number of the water inlet pipe arrays 32 is multiple, and the multiple water inlet pipe arrays are staggered. In the embodiment shown in fig. 4, the number of the water inlet pipe arrays 31 is two, and the two water inlet pipe arrays 31 are vertically staggered.
Optionally, the water inlet pipe array 32 and the sludge inlet pipe array 31 are staggered. In the embodiment shown in fig. 4, two arrays 32 of inlet pipes and two arrays 31 of sludge inlet pipes are staggered.
The top of the side wall of the tank body 11 is provided with a circle of liquid outlet grooves 22, the liquid outlet grooves 22 are of a U-shaped structure, the bottom of the liquid outlet grooves 22 is provided with one or more water outlets 23 for collecting fermentation liquid, and the water outlets 23 are connected to the liquid outlet 16 through pipelines. In the embodiment shown in fig. 4, the number of the drain openings 23 is one, however, the number of the drain openings 23 may be multiple, and a plurality of drain openings are uniformly distributed in the liquid outlet tank, and each drain opening is connected to the liquid outlet 16 at the upper part of the tank body through a pipeline.
The top of the tank body 11 is also provided with a slag blocking plate circular ring 38 consisting of a ring of vertical slag blocking plates 24, and the diameter of the slag blocking plate circular ring 38 is smaller than that of the liquid outlet groove 22 and keeps a gap of 10-20cm with the liquid outlet groove 22.
A layer of scum floats on the top of the fermentation liquid, the scum baffle ring 38 is used for stopping the scum on the top of the fermentation liquid outside the liquid outlet tank 22, and the fermentation liquid overflows to the liquid outlet tank from a gap between the scum baffle ring 38 and the liquid outlet tank 22 so as to ensure that the fermentation liquid is relatively clear.
Optionally, the upper edge of the slag trap 24 is 10-30cm higher than the upper edge of the liquid outlet groove 22. Optionally, the upper edge of the slag trap 24 is 20cm higher than the upper edge of the tapping spout 22.
Optionally, the lower edge of the slag trap 24 is 5-20cm lower than the upper edge of the liquid outlet groove 22. Optionally, the lower edge of the slag trap 24 is 10cm lower than the upper edge of the tapping spout 22.
Optionally, the height of the slag trap 24 is 30-50 cm. Optionally, the height of the slag trap 24 is 40 cm.
The tank body 11 is also provided with a stirring claw 25, the stirring claw 25 is driven to rotate by a rotating shaft 26 at the center of the tank body, and a driving device of the rotating shaft 26 is arranged at the top of the tank body. The bottom of the stirring claw 25 is provided with a transverse tooth 27 with an inverted cone structure matched with the bottom 12 of the tank body, the transverse tooth 27 is provided with a plurality of upright vertical teeth 28, and the upright teeth 28 are arranged with the water inlet pipe 20 and the mud inlet pipe 18 in a staggered way. The stirring claw 25 rotates clockwise or counterclockwise for mixing the sludge in the tank 11 and the elutriation water sufficiently and uniformly.
Alternatively, the stirring claw 25 is provided at a middle position of the can body.
Alternatively, the stirring claw 25 is provided at the bottom position of the can body.
Alternatively, the upright teeth 28 are L-shaped structures, with the tips of the upright teeth 28 facing in the direction of rotation.
Optionally, the biological fermentation device further comprises a mud scraper 29, the mud scraper 29 is a symmetrical blade structure, and the mud scraper 29 is disposed in the mud storage bucket 13 below the stirring claw 25 and is coaxial with the stirring claw 29. The stirring claw 25 rotates while the scraper 29 coaxially rotates for keeping the sludge in the hopper 13 in a fluid state to prevent the clogging of the sludge outlet 17.
Figure 5 shows an alternative embodiment of the mud intake pipe.
In this alternative embodiment, the bottom nozzle of the sludge inlet pipe 18 is a first sludge inlet 33, and the sidewall of the bottom nozzle of the sludge inlet pipe 18 is further provided with a plurality of second sludge inlets 34.
Optionally, the aperture of the first sludge inlet 33 is 8-12 mm. Optionally, the aperture of the first sludge inlet 33 is 10 mm.
Optionally, the aperture of the second sludge inlet 34 is 6-7 mm. Optionally, the aperture of the second sludge inlet 34 is 6 mm.
Figure 6 shows an alternative embodiment of the water inlet pipe.
In this alternative embodiment, the bottom nozzle of the inlet pipe 20 is a first inlet 35, and the side wall of the bottom nozzle of the inlet pipe 20 is further provided with a plurality of second inlets 36.
Optionally, the first water inlet 35 has a bore diameter of 2-3 mm. Optionally, the aperture of the second water inlet is 1-2 mm.
Optionally, the first sludge inlet 33 at the bottom of the sludge inlet pipe 18 is arranged at the height position of the tank 1/7-1/4. The height of the tank body is from the tip of the inverted cone structure at the bottom to the top of the tank body. Optionally, the first sludge inlet 33 is disposed at the height of the tank 1/5.
Optionally, the first water inlet 35 at the bottom of the water inlet pipe 20 is arranged at the height of the tank 1/6-1/3. The height of the tank body is from the tip of the inverted cone structure at the bottom to the top of the tank body. Optionally, the first water inlet 35 is disposed at the height of the tank 1/4.
In the fermentation process, a fermentation liquid layer is arranged at the upper part of the tank body 11 and is in a liquid state; the middle part of the tank body 11 is a fermentation layer which is in a mud-liquid mixed state; the bottom of the tank body 11 is a sludge layer which is compacted sludge.
The sewage treatment system utilizing the sludge fermentation of the primary sedimentation tank of the invention ferments the sludge generated by the reinforced primary sedimentation tank, and the generated fermentation liquor is used as a carbon source for a subsequent aeration biological filter, so that on one hand, the sludge of the reinforced primary sedimentation tank is recycled, on the other hand, the fermentation liquor generated by the biological fermentation device can be used as a carbon source for a subsequent biochemical treatment link, no external carbon source is required to be added, and the cost is saved.
The invention also provides a sewage treatment method, which is based on the sewage treatment system utilizing the sludge fermentation of the primary sedimentation tank to treat sewage.
FIG. 7 shows an alternative embodiment of the wastewater treatment process.
In this optional embodiment, the sewage treatment method comprises the steps of: step 11, controlling the sludge discharge q of the sludge outlet 17 according to the sludge level H of the sludge in the tank body1(ii) a Step 12, controlling the water inflow q of the water inlet 15 according to the hydraulic retention time HRT of the sludge2And the mud inlet amount q of the mud inlet 143。
Optionally, the sludge discharge q of the sludge outlet 17 is controlled according to the sludge level H of the sludge in the tank body1The method comprises the following steps: controlling the sludge discharge q of the sludge outlet 17 according to the sludge age SRT of the sludge in the tank body and the sludge level H of the sludge1The sludge age SRT formula is as follows:
SRT＝K·H·A/q1
wherein: SRT is 5-7 days; k is the solid content of the sludge and is a fixed value; a is the cross-sectional area of the tank body; v1Is the volume of sludge, V1Obtaining the sludge level H of the sludge and the cross-sectional area A of the tank body according to the measured sludge level H; q. q.s1The amount of sludge discharged.
Optionally, a mud level meter is arranged on the top of the tank 11 for measuring the mud level H of the sludge.
Optionally, controlling the water inflow q of the water inlet 15 according to the hydraulic retention time HRT of the sludge2And the mud inlet amount q of the mud inlet 143The method comprises the following steps:
hydraulic retention time formula of sludge: HRT ═ V2/(q2+q3)
Wherein: HRT is 12-24 hours; v2The total volume of the sludge and the fermentation liquor in the tank body; q. q.s2Is the water inflow of the water inlet 15, q3Is the mud inlet amount of the mud inlet 14. The total volume V of the sludge and the fermentation liquor in the tank body2Can be obtained by a liquid level detection device and a mud level meter, so that the water inflow q of the biological fermentation device is controlled according to the hydraulic retention time HRT of the sludge2And the mud feeding amount q3。
Optionally, the wastewater treatment method further comprises: controlling the water inflow q according to the oxidation-reduction potential value ORP2And the mud feeding amount q3。
The normal range of ORP is-200 mV to-100 mV, and when the ORP exceeds the upper limit, the water inflow q is controlled to be increased2Decreasing the amount of sludge q3. When the oxidation reduction potential value ORP falls below the lower limit, controlling to reduce the water inflow q2Increasing the sludge feeding amount q3。
Optionally, an oxidation-reduction potential meter is further arranged in the tank body and used for detecting an oxidation-reduction potential value ORP of the fermentation liquor.
According to the sewage treatment method, the sludge generated by the enhanced primary sedimentation tank is fermented, and the generated fermentation liquor is used as a carbon source for a subsequent aeration biological filter, so that on one hand, the sludge of the enhanced primary sedimentation tank is recycled, on the other hand, the fermentation liquor generated by the biological fermentation device can be used as a carbon source for a subsequent biochemical treatment link, no external carbon source is required to be added, and the cost is saved.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents, improvements and the like that fall within the spirit and principle of the present invention are intended to be included therein.

Claims (9)

1. A sewage treatment system utilizing sludge fermentation in a primary sedimentation tank comprises: the system comprises a grid (1), a grit chamber (2), a reinforced primary settling tank (3), an aeration biological filter (4) and a disinfection tank (5), and is characterized by further comprising a biological fermentation device (6), wherein sludge generated by the reinforced primary settling tank (3) is conveyed to the biological fermentation device (6) for fermentation, and fermentation liquor generated by the biological fermentation device (6) is conveyed to the reinforced primary settling tank (3);
the biological fermentation device (6) comprises: the sludge storage tank comprises a tank body (11), wherein the bottom (12) of the tank body is of an inverted cone structure, a sludge storage hopper (13) is arranged at the bottom of the tank body, and a sludge outlet (17) is formed in the side wall or the bottom of the sludge storage hopper; the upper part of the tank body is provided with a sludge inlet (14), a water inlet (15) and a liquid outlet (16);
a mud inlet pipe array (31) is arranged in the tank body, the mud inlet pipe array comprises a plurality of vertical mud inlet pipes (18), mud is discharged from the bottoms of the mud inlet pipes, the tops of the mud inlet pipes are connected with a first main pipe (19), and the first main pipe (19) is connected with the mud inlet (14);
the tank body is also provided with a water inlet pipe array (32), the water inlet pipe array comprises a plurality of vertical water inlet pipes (20), water is discharged from the bottoms of the water inlet pipes, the tops of the water inlet pipes are connected with a second main pipe (21), and the second main pipe (21) is connected with the water inlet (15);
a circle of liquid outlet groove (22) is formed in the top of the side wall of the tank body, the liquid outlet groove (22) is of a U-shaped structure, one or more water outlets (23) for collecting fermentation liquid are formed in the bottom of the liquid outlet groove, and the water outlets (23) are connected to the liquid outlet (16) through pipelines; the top of the tank body is also provided with a slag blocking plate circular ring (38) formed by a circle of vertical slag blocking plates (24), the diameter of the slag blocking plate circular ring (38) is smaller than that of the liquid outlet tank, and a gap of 10-20cm is kept between the slag blocking plate circular ring and the liquid outlet tank; the upper edge of the slag blocking plate is 10-30cm higher than the upper edge of the liquid outlet groove, the lower edge of the slag blocking plate is 5-20cm lower than the upper edge of the liquid outlet groove, and the height of the slag blocking plate is 30-50 cm;
still be provided with stirring claw (25) in the jar body, the stirring claw is rotatory by pivot (26) drive at jar body center, the drive arrangement of pivot sets up at jar body top, the bottom of stirring claw be provided with jar body bottom looks adaptation's horizontal tooth (27) of back taper structure, be provided with a plurality of upright vertical teeth (28) that make progress on the horizontal tooth, vertical tooth (28) with inlet tube (20) with advance mud pipe (18) crisscross the setting.
2. The sewage treatment system utilizing sludge fermentation in a primary sedimentation tank of claim 1, wherein the number of the sludge inlet pipe arrays (31) is plural, and the plural sludge inlet pipe arrays are arranged in a staggered manner.
3. The sewage treatment system utilizing sludge fermentation in a primary sedimentation tank of claim 1, wherein the number of the water inlet pipe arrays (32) is plural, and the plural water inlet pipe arrays are arranged in a staggered manner.
4. The sewage treatment system utilizing primary sedimentation tank sludge fermentation according to claim 1, wherein the water inlet pipe array (32) and the sludge inlet pipe array (31) are staggered.
5. The sewage treatment system utilizing primary sedimentation tank sludge fermentation according to claim 1, further comprising a scraper (29) having a symmetrical blade structure, wherein the scraper (29) is disposed in the sludge storage hopper below the stirring claw (25) and is disposed coaxially with the stirring claw.
6. A sewage treatment method for treating sewage based on the sewage treatment system according to any one of claims 1 to 5, comprising the steps of:
controlling the sludge discharge amount of the sludge outlet according to the sludge level of the sludge in the tank body;
and controlling the water inflow of the water inlet and the sludge inlet of the sludge inlet according to the hydraulic retention time of the sludge.
7. The sewage treatment method according to claim 6, wherein the step of controlling the sludge discharge amount of the sludge outlet according to the sludge level of the sludge in the tank comprises:
controlling the sludge discharge amount of the sludge outlet according to the sludge age SRT of the sludge in the tank body and the sludge level of the sludge, wherein the sludge age SRT formula is as follows:
SRT＝K·V1/q1
wherein: SRT is 5-7 days; k is the solid content of the sludge and is a fixed value; a is the cross-sectional area of the tank body; v1Is the volume of sludge, V1Obtaining the sludge level H of the sludge and the cross-sectional area of the tank body according to the measured sludge level H; q. q.s1The amount of sludge discharged.
8. The wastewater treatment method according to claim 6, wherein the step of controlling the water inflow of the water inlet and the sludge inflow of the sludge inlet according to the hydraulic retention time HRT of the sludge comprises:
HRT＝V2/(q2+q3)
wherein: HRT is 12-24 hours; v2The total volume of the sludge and the fermentation liquor in the tank body; q. q.s2Is the water inflow q3The sludge feeding amount is shown.
9. The wastewater treatment method according to claim 8, further comprising:
controlling the water inflow q according to the oxidation-reduction potential value of the fermentation liquor2And the mud inlet amount q3。
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CN104118971A (en) * 2014-08-12 2014-10-29 刘智晓 Method for strengthening nitrogen and phosphorus removal by using hydrolysis and fermentation of mixed sludge of sewage plant
CN108675560A (en) * 2018-06-11 2018-10-19 河海大学 A kind of domestic sewage processing system

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Publication number Priority date Publication date Assignee Title
CN101913703A (en) * 2010-07-06 2010-12-15 国家城市给水排水工程技术研究中心 Primary sludge fermentation pretreatment method and system for improving performances of dephosphorization and denitrification on town sewage
CN104118971A (en) * 2014-08-12 2014-10-29 刘智晓 Method for strengthening nitrogen and phosphorus removal by using hydrolysis and fermentation of mixed sludge of sewage plant
CN108675560A (en) * 2018-06-11 2018-10-19 河海大学 A kind of domestic sewage processing system

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