CN113480104A - Sewage treatment system and method utilizing internal carbon source based on sludge fermentation - Google Patents
Sewage treatment system and method utilizing internal carbon source based on sludge fermentation Download PDFInfo
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- 239000010802 sludge Substances 0.000 title claims abstract description 301
- 238000000855 fermentation Methods 0.000 title claims abstract description 271
- 230000004151 fermentation Effects 0.000 title claims abstract description 266
- 239000010865 sewage Substances 0.000 title claims abstract description 67
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 title claims abstract description 54
- 229910052799 carbon Inorganic materials 0.000 title claims abstract description 54
- 238000000034 method Methods 0.000 title claims abstract description 33
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 78
- 238000000926 separation method Methods 0.000 claims abstract description 48
- 238000004519 manufacturing process Methods 0.000 claims abstract description 23
- 239000002253 acid Substances 0.000 claims abstract description 22
- 238000005496 tempering Methods 0.000 claims abstract description 19
- 238000006243 chemical reaction Methods 0.000 claims abstract description 13
- 238000004062 sedimentation Methods 0.000 claims description 78
- 230000003750 conditioning effect Effects 0.000 claims description 33
- 238000003860 storage Methods 0.000 claims description 19
- 239000006228 supernatant Substances 0.000 claims description 17
- 230000014759 maintenance of location Effects 0.000 claims description 8
- 238000005842 biochemical reaction Methods 0.000 claims description 6
- 239000012535 impurity Substances 0.000 claims description 5
- 238000010992 reflux Methods 0.000 claims description 5
- 238000002156 mixing Methods 0.000 claims description 4
- 239000002245 particle Substances 0.000 claims description 4
- 230000002053 acidogenic effect Effects 0.000 claims description 3
- 230000001112 coagulating effect Effects 0.000 claims description 2
- 238000004064 recycling Methods 0.000 claims description 2
- 238000007599 discharging Methods 0.000 claims 1
- 239000012530 fluid Substances 0.000 claims 1
- 239000003344 environmental pollutant Substances 0.000 abstract description 4
- 231100000719 pollutant Toxicity 0.000 abstract description 4
- 238000011084 recovery Methods 0.000 abstract description 3
- 238000003756 stirring Methods 0.000 abstract description 3
- 238000010791 quenching Methods 0.000 abstract description 2
- 230000000171 quenching effect Effects 0.000 abstract description 2
- 239000007788 liquid Substances 0.000 description 19
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 18
- OAICVXFJPJFONN-UHFFFAOYSA-N Phosphorus Chemical compound [P] OAICVXFJPJFONN-UHFFFAOYSA-N 0.000 description 11
- 229910052698 phosphorus Inorganic materials 0.000 description 11
- 239000011574 phosphorus Substances 0.000 description 11
- 229910052757 nitrogen Inorganic materials 0.000 description 9
- 238000004659 sterilization and disinfection Methods 0.000 description 8
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- 238000001556 precipitation Methods 0.000 description 4
- VMHLLURERBWHNL-UHFFFAOYSA-M Sodium acetate Chemical compound [Na+].CC([O-])=O VMHLLURERBWHNL-UHFFFAOYSA-M 0.000 description 3
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- 102000010911 Enzyme Precursors Human genes 0.000 description 2
- 108010062466 Enzyme Precursors Proteins 0.000 description 2
- 238000005273 aeration Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
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- 238000012544 monitoring process Methods 0.000 description 1
- 238000006396 nitration reaction Methods 0.000 description 1
- 230000001546 nitrifying effect Effects 0.000 description 1
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- 230000001502 supplementing effect Effects 0.000 description 1
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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
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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
- 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
- C02F11/00—Treatment of sludge; Devices therefor
- C02F11/12—Treatment of sludge; Devices therefor by de-watering, drying or thickening
- C02F11/121—Treatment of sludge; Devices therefor by de-watering, drying or thickening by mechanical de-watering
-
- 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
- C02F1/52—Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities
- C02F1/5281—Installations for water purification using chemical agents
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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
- C02F1/00—Treatment of water, waste water, or sewage
- C02F2001/007—Processes including a sedimentation step
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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
- C02F3/00—Biological treatment of water, waste water, or sewage
- C02F3/28—Anaerobic digestion processes
-
- 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
- C02F3/28—Anaerobic digestion processes
- C02F3/286—Anaerobic digestion processes including two or more steps
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- Engineering & Computer Science (AREA)
- Hydrology & Water Resources (AREA)
- Environmental & Geological Engineering (AREA)
- Water Supply & Treatment (AREA)
- Chemical & Material Sciences (AREA)
- Organic Chemistry (AREA)
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Abstract
The invention discloses a sewage treatment system and method utilizing an internal carbon source based on sludge fermentation, and belongs to the technical field of sewage treatment. The primary sludge discharged by a sewage treatment plant is subjected to quenching and tempering to reach a certain sludge concentration, fermentation acid production reaction is performed under the fermentation conditions of stirring, temperature control and the like to produce fermentation liquor rich in SCOD and VFAs, and the fermentation liquor can be directly recycled to a denitrification unit of a biological filter as a supplementary carbon source after high-efficiency sludge-water separation, so that the effective recovery of the fermentation liquor is realized, the biochemical denitrification of a system is enhanced, and the purposes of reducing the discharge amount of the primary sludge, saving an external carbon source and removing pollutants are achieved.
Description
Technical Field
The invention belongs to the technical field of sewage treatment, and particularly relates to a sewage treatment system and method utilizing an internal carbon source based on sludge fermentation.
Background
With the improvement of sewage discharge standard of sewage treatment plant by ecological environment management department, sewage treatment plant must further improve the nitrogen and phosphorus removal performance of sewage. The combined process of the high-efficiency sedimentation tank and the multistage biological filter tank is a town sewage treatment process which is widely applied and can effectively remove pollutants such as carbon, nitrogen, phosphorus and the like in sewage. In the process of the operation of the process, most of non-soluble organic pollutants in the inlet water are removed by the front-end efficient sedimentation tank unit, and the content of organic matter components in the generated primary sludge is high, so that a large amount of external carbon sources are required to be supplemented frequently in the subsequent biochemical denitrification of the filter. Therefore, the combined process of the high-efficiency sedimentation tank and the multi-stage biological filter tank has the defects of large discharge amount of primary sludge and large amount of external carbon source for biochemical denitrification.
Non-soluble organic matters in the primary sludge discharged from the high-efficiency sedimentation tank are converted into biodegradable soluble organic matters (SCOD) by utilizing a fermentation acid production technology, so that on one hand, carbon sources required by biochemical denitrification can be supplemented, the cost of external carbon sources is saved, on the other hand, the discharge amount of the primary sludge of a sewage plant can be reduced, and the sludge treatment cost is reduced.
Through search, Chinese patent application with publication number CN103663681A, published 3 and 26 in 2014, discloses a device and a method for advanced nitrogen and phosphorus removal of municipal sewage by SBR utilizing carbon sources in sludge. The device comprises a sludge fermentation tank, a fermentation liquor separation tank, a fermentation liquor denitrification and dephosphorization tank, a carbon source storage tank, a municipal sewage tank and an anaerobic/aerobic/anoxic SBR, wherein the sludge fermentation tank is a closed tank body, and the anaerobic/aerobic/anoxic SBR is an open tank body. The method comprises the steps that municipal sewage enters an SBR reactor, phosphorus accumulating bacteria under anaerobic condition firstly carry out anaerobic phosphorus release by utilizing a carbon source in raw water in one period, then nitrifying bacteria under aerobic condition carry out nitration reaction and phosphorus accumulating bacteria absorb phosphorus, finally denitrifying bacteria under anoxic condition utilize fermentation liquor which is generated by sludge anaerobic fermentation and is rich in short-chain fatty acid to carry out denitrification, and the processes are repeated to remove nitrogen and phosphorus in the municipal sewage. Although the invention does not need to add carbon source, and utilizes the carbon source in the municipal sewage and the fermentation liquor to carry out nitrogen and phosphorus removal, thereby reducing the cost and reducing the sludge, the invention adopts the excess sludge fermentation liquor, and needs to remove a large amount of nitrogen and phosphorus in the fermentation liquor for the second time before the fermentation liquor is utilized, the process route is long, the control requirement is high, and the economy is poor.
In addition, the chinese patent application publication No. CN109354343A, published 2019, 2 and 19, discloses a sewage treatment system and a sewage treatment method using sludge fermentation in a primary sedimentation tank. The sewage treatment 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. Although the invention utilizes the sludge fermentation of the primary sedimentation tank, the sludge fermentation liquor is returned to the primary sedimentation system again in the primary sedimentation sludge utilization mode adopted by the invention, the primary sedimentation system can obviously remove COD (which can reach about 60 percent), but the removal of TN is very limited, thereby reducing the net value increase of COD in the fermentation liquor and reducing the effective utilization rate of the fermentation liquor.
Disclosure of Invention
1. Problems to be solved
Aiming at the problems of large discharge amount of primary sludge and large amount of biochemical denitrification and external carbon source in the prior sewage treatment technology, the invention provides a sewage treatment system and method utilizing an internal carbon source based on sludge fermentation. The invention removes large-size impurities from primary sludge discharged from a sewage treatment plant, then carries out quenching and tempering treatment on the primary sludge, carries out fermentation and acid production reaction under the conditions of stirring and temperature control to produce SCOD (soluble organic matters) and VFAs (volatile fatty acids), realizes the recovery of fermentation liquor after sludge-water separation of the fermented sludge, and recycles the fermentation liquor to a denitrification unit of a biological filter as a supplementary carbon source to strengthen the biochemical denitrification of a system, thereby achieving the purposes of reducing the discharge amount of the primary sludge and saving an additional carbon source to remove pollutants.
2. Technical scheme
In order to solve the problems, the technical scheme adopted by the invention is as follows:
the sewage treatment system utilizing the internal carbon source based on sludge fermentation sequentially comprises a pretreatment tank, a high-density sedimentation tank and a multistage biological filter tank, and further comprises a sludge fermentation unit, wherein a sludge discharge port of the high-density sedimentation tank is connected with a sludge inlet of the sludge fermentation unit through a pipeline, a water discharge port of the sludge fermentation unit is connected with a water inlet of the multistage biological filter tank through a pipeline, and the sludge fermentation unit is used for performing fermentation treatment on primary sludge discharged from the high-density sedimentation tank and conveying fermentation liquor generated by the fermentation treatment to the multistage biological filter tank.
Preferably, the sewage treatment system utilizing the internal carbon source based on sludge fermentation further comprises a sludge storage tank, and the sludge discharge port of the sludge fermentation unit is connected with the sludge inlet of the sludge storage tank through a pipeline.
Preferably, the sludge fermentation unit sequentially comprises a sludge conditioning tank, a sludge fermentation tank, a fermentation sedimentation tank and a sludge-water separation device, wherein sludge discharge ports of the fermentation sedimentation tank and the sludge-water separation device are connected with a sludge inlet of the sludge storage tank through pipelines.
Preferably, the sludge conditioning tank comprises a conditioning tank body, a conditioning emptying port is arranged on the side wall or the bottom of the conditioning tank body, a conditioning sludge inlet, a conditioning water inlet, a sludge return port and a conditioning sludge outlet are arranged on the upper portion of the conditioning tank body, and the conditioning sludge outlet is connected with the sludge fermentation tank through a pipeline.
Preferably, the sludge fermentation tank comprises a fermentation tank body, a fermentation emptying port is arranged on the side wall or the bottom of the fermentation tank body, a fermentation sludge inlet is arranged on the side wall or the bottom of the fermentation tank body, a fermentation liquid return port and a fermentation water outlet are arranged on the side wall or the upper portion of the fermentation tank body, and the fermentation water outlet is connected with the fermentation sedimentation tank through a pipeline.
Preferably, the fermentation and sedimentation tank comprises a fermentation and sedimentation tank body, a fermentation and sedimentation water inlet is formed in the side wall of the fermentation and sedimentation tank body, an inclined plate or an inclined pipe is arranged at the upper part of the fermentation and sedimentation tank body, a fermentation and sedimentation water outlet is formed in the side wall or the upper part of the fermentation and sedimentation tank body, and the fermentation and sedimentation water outlet is connected with the mud-water separation device through a pipeline.
Preferably, the mud-water separation device is provided with a separation water inlet, a separation water outlet and a separation sludge discharge port, the separation water inlet of the mud-water separation device is connected with the sedimentation water outlet of the fermentation sedimentation tank, the separation water outlet of the mud-water separation device is connected with the multi-stage biological filter, and the separation sludge discharge port is connected with the sludge storage tank.
Preferably, the fermentation tank body further comprises a fermentation stirrer, and the fermentation stirrer is arranged at the center of the top of the fermentation tank body.
Preferably, the bottom of the fermentation and sedimentation tank body is provided with a liquid distribution pipe and a sludge collection bucket, the liquid distribution pipe is positioned above the sludge collection bucket, a sludge discharge pipe is arranged in the sludge collection bucket, and the sludge discharge pipe is connected with a fermentation and sedimentation sludge discharge port arranged on the side wall or the bottom of the fermentation and sedimentation tank body.
More preferably, the sewage treatment system utilizing the internal carbon source based on sludge fermentation further comprises a disinfection tank, and the water outlets of the multi-stage biological filter are connected with the disinfection tank through pipelines.
The invention discloses a sewage treatment method utilizing an internal carbon source based on sludge fermentation, which is characterized by comprising the following steps of:
s10, pretreating the sewage in a pretreatment tank to remove large-particle impurities to obtain pretreated sewage;
s20, carrying out coagulating sedimentation treatment on the pretreated sewage in a high-density sedimentation tank, and removing most organic matters in the sewage to obtain effluent and primary sludge of the sedimentation tank;
s30, sending the effluent of the sedimentation tank into a multi-stage biological filter for biological denitrification and denitrification reaction to obtain effluent after denitrification and denitrification;
and S40, feeding the primary sludge into a sludge fermentation unit for fermentation to produce acid to obtain fermentation liquor and fermented sludge, and feeding the fermentation liquor into a multi-stage biological filter for use as a supplementary carbon source for biological denitrification.
Preferably, in step S40, the fermentation acidogenesis process of the primary sludge includes: mixing and tempering the effluent after denitrification and the primary sludge in a sludge tempering tank to obtain tempered primary sludge; then carrying out fermentation acid production biochemical reaction on the conditioned sludge in a sludge fermentation tank to convert non-soluble organic matters in the sludge into soluble organic matters so as to obtain fermentation liquor containing the soluble organic matters and fermented sludge; and carrying out sludge-water separation treatment on the fermentation liquor in a sludge-water separation device, removing a large amount of suspended matters to obtain a fermentation liquor supernatant, and recycling the fermentation liquor supernatant to the multistage biofilter.
Preferably, 10-30% of fermentation liquor in volume ratio is refluxed and used as the reflux sludge to enter the sludge conditioning tank.
Preferably, the mass concentration of the quenched and tempered primary sludge is 2-10%.
Preferably, in the fermentation acidogenic biochemical reaction process, the ORP in the sludge fermentation tank is controlled to be-350 mv to-50 mv, and the sludge fermentation retention time in the sludge fermentation tank is 2-10 d.
Preferably, the concentration of suspended matter in the supernatant of the fermentation broth is controlled to be below 100 mg/L.
3. Advantageous effects
Compared with the prior art, the invention has the beneficial effects that:
(1) compared with the existing biological filter sewage treatment system, the sludge fermentation unit is added for primary sludge fermentation acid production treatment discharged from the high-efficiency sedimentation tank, and the added sludge fermentation unit is independent of the existing biological filter sewage treatment system, so that the normal operation of the existing sewage treatment system cannot be influenced;
(2) the invention relates to a sewage treatment system utilizing an internal carbon source based on sludge fermentation, wherein a sludge fermentation unit comprises a sludge conditioning tank, a sludge fermentation tank, a fermentation sedimentation tank and a sludge-water separation device, the concentration of sludge entering the fermentation tank is controlled through the blending treatment of the sludge conditioning tank, and the ORP and the sludge retention time in the sludge fermentation tank are adjusted, so that the sludge obtains good acid production performance, and the sludge is used for carbon source supplement of subsequent denitrification and system biochemical denitrification enhancement;
(3) according to the sewage treatment system utilizing the internal carbon source based on sludge fermentation, the high-efficiency sludge-water separation device is arranged in the sludge fermentation unit, so that suspended matters in fermentation liquor are reduced to be below 100mg/L, the sludge fermentation unit can be directly used as a denitrification supplementary carbon source for a biological filter, the load of suspended matters in the filter is not increased, the filter is not blocked, and the cost for supplementing the carbon source for the sewage treatment plant is reduced;
(4) the invention relates to a sewage treatment method utilizing an internal carbon source based on sludge fermentation, which adjusts the mixing proportion of primary sludge and filter outlet water through flow control, so that the modified sludge has a proper sludge concentration with a mass concentration of 2-10%, and controls the ORP in a sludge fermentation tank to be-350 mv to-50 mv during a biochemical reaction process of fermentation acid production, the sludge fermentation residence time in the sludge fermentation tank is 2-10 d, the fermentation tank is ensured to be in a fermentation acid production stage, and does not enter an anaerobic methane production stage for reducing the acid production rate of sludge fermentation, non-soluble organic matters in the sludge are subjected to hydrolysis fermentation acid production reaction under the action of hydrolysis zymogens, and are converted into soluble organic matters and micromolecular fatty acids, and the utilization of fermentation liquor is effectively realized.
Drawings
FIG. 1 is a schematic diagram showing the structure of a sewage treatment system using an internal carbon source based on sludge fermentation according to the present invention;
in the figure:
100. a pretreatment tank; 200. a high-density sedimentation tank; 300. a multi-stage biological filter;
400. a sludge fermentation unit; 410. a sludge conditioning tank; 420. a sludge fermentation tank;
430. a fermentation and sedimentation tank; 440. a mud-water separation device; 4101. tempering the tank body;
4102. tempering and emptying ports; 4103. hardening and tempering a sludge inlet; 4104. a tempering water inlet;
4105. a sludge return port; 4106. tempering a sludge outlet; 4107. a tempering stirrer;
4201. a fermentation tank body; 4202. a fermentation emptying port; 4203. a sludge inlet for fermentation;
4204. a fermentation liquor reflux port; 4205. a fermentation water outlet; 4206. a fermentation agitator;
4301. a fermentation and sedimentation tank body; 4302. a fermentation precipitation water inlet; 4303. an inclined tube;
4304. a fermentation and precipitation water outlet; 4305. a liquid distribution pipe; 4306. a mud collection hopper;
4307. a sludge discharge pipe; 4308. a fermentation and sedimentation sludge discharge port; 4401. separating the water inlet;
4402. a separation water outlet; 4403. separating a sludge discharge port; 500. a sludge storage tank;
600. a disinfection tank; 700. a sludge dewatering unit.
Detailed Description
The invention is further described with reference to specific examples.
As shown in FIG. 1, the method for treating sewage using internal carbon source based on sludge fermentation according to the present invention, is realized by a sewage treatment system utilizing an internal carbon source based on sludge fermentation, which comprises a pretreatment tank 100, a high-density sedimentation tank 200, a multi-stage biofilter 300, a sludge fermentation unit 400, a sludge storage tank 500, a disinfection tank 600 and a sludge dewatering unit 700, the water inlet of the pretreatment tank 100 can be connected with a municipal sewage inlet pipe, sewage enters the pretreatment tank 100 and is pretreated through a coarse and fine grid, large particle impurities in the sewage are removed, pretreated sewage is obtained, the pretreated sewage enters the high-density sedimentation tank 200 through a water outlet of the pretreatment tank 100 through a pipeline, most organic matters, suspended matters and phosphorus in the sewage are removed through the enhanced coagulation sedimentation treatment of the high-density sedimentation tank 200, and effluent and primary sludge of the high-density sedimentation tank are obtained;
the effluent of the high-density sedimentation tank enters the multi-stage biological filter 300 through a pipeline via the water outlet of the high-density sedimentation tank 200, the enhanced biochemical denitrification and decarbonization reaction is carried out under the biological nitrification and biological denitrification effects of the multi-stage biological filter 300, the effluent after the reaction enters the disinfection tank 600 through the pipeline via the water outlet of the multi-stage biological filter 300 for disinfection treatment, and the water reaching the standard after the physicochemical disinfection treatment is discharged through a water discharge port (not shown) of a sewage plant.
Meanwhile, the primary sludge generated by the high-density sedimentation tank 200 can be periodically discharged into the sludge fermentation unit 400 through a pipeline through a sludge discharge port of the high-density sedimentation tank 200 to perform primary sludge fermentation acid production reaction to obtain fermentation liquor and fermentation sludge, and then the fermentation liquor is sent into the multi-stage biological filter 300 to be used as a supplementary carbon source for biological denitrification reaction; when the primary sludge fermentation is not needed, the primary sludge can be periodically discharged into the sludge storage tank 500 through a pipeline through a sludge discharge port of the high-density sedimentation tank 200; and the biochemical excess sludge generated by the multistage biofilter 300 and the precipitated sludge generated by the sludge fermentation unit 400 can also be periodically discharged into the sludge storage tank 500 through pipelines, the sludge discharge port of the sludge storage tank 500 is connected with the sludge dewatering unit 700 through a pipeline, the primary sludge and the biochemical excess sludge collected by the sludge storage tank 500 enter the sludge dewatering unit 700 for sludge dewatering treatment, and the dewatered sludge after dewatering treatment can be comprehensively treated by transporting vehicles.
It should be further noted that the sludge fermentation unit 400 is a primary sludge treatment unit for producing fermentation liquor rich in soluble organic matters by primary sludge fermentation and acid production, the sludge fermentation unit 400 includes a sludge conditioning tank 410, a sludge fermentation tank 420, a fermentation sedimentation tank 430 and a sludge-water separation device 440, wherein the sludge conditioning tank 410 includes a conditioning tank body 4101, the conditioning tank body 4101 may be of a flat bottom structure, a conditioning emptying port 4102 is arranged on the side wall or bottom of the conditioning tank body 4101, a conditioning sludge inlet 4103, a conditioning water inlet 4104, a sludge return port 4105 and a conditioning sludge outlet 4106 are arranged on the upper portion of the conditioning tank body 4101, and the conditioning sludge outlet 4106 is connected with the sludge fermentation tank 420 through a pipeline; and the tempering tank body 4101 is further provided with a vertical tempering stirrer 4107, and the tempering stirrer 4107 is arranged at the center of the top of the tempering tank body 4101.
The sludge fermentation tank 420 comprises a fermentation tank body 4201, the fermentation tank body 4201 can be of a flat-bottom structure, a fermentation emptying port 4202 is arranged on the side wall or the bottom of the fermentation tank body 4201, a fermentation sludge inlet port 4203 is arranged on the side wall or the bottom of the fermentation tank body 4201, a fermentation liquid return port 4204 and a fermentation water outlet port 4205 are arranged on the side wall or the upper portion of the fermentation tank body 4201, and the fermentation water outlet port 4205 is connected with a fermentation sedimentation tank 430 through a pipeline; and fermenter 4201 further comprises a fermentation agitator 4206, and fermentation agitator 4206 is disposed at a central position of a top of fermenter 4201;
in the sludge conditioning tank 410, primary sludge discharged from the high-density sedimentation tank 200, effluent of the multi-stage biofilter 300 and return sludge of the sludge fermentation tank 420 are mixed and conditioned to enable the mass concentration of the conditioned sludge to reach 2-10%, then the conditioned sludge enters the sludge fermentation tank 420 to undergo anaerobic fermentation acidogenesis biochemical reaction, the ORP in the sludge fermentation tank is controlled to be-200 +/-150 mv, the sludge fermentation residence time in the sludge fermentation tank is 2-10 d, non-soluble organic matters in the sludge are converted into soluble organic matters through fermentation acidogenesis and enter fermentation liquor to obtain fermentation liquor and fermentation sludge containing the soluble organic matters, wherein 10-30% of fermentation liquor in volume ratio is refluxed and used as the return sludge to enter the sludge conditioning tank 410.
It should be noted that the primary sludge of the present invention enters the sludge conditioning tank 410, and first, large particle impurities in the primary sludge are removed through the screen, and the primary sludge is conditioned, so that the conditioned sludge has a suitable sludge concentration, so as to control the primary sludge in the sludge fermentation tank 420 to be in an optimal fermentation acid-producing state. Compared with other sludge fermentation systems with fixed sludge retention time and without controlling ORP, the invention adjusts the primary sludge fermentation retention time in time by monitoring parameters such as pH, ORP, temperature and the like in the fermentation tank 420, controls the fermentation acid production stage in the fermentation tank 420 without entering the anaerobic methane production stage for reducing the sludge fermentation acid production rate, and carries out hydrolysis fermentation acid production reaction on non-soluble organic matters in the sludge under the action of hydrolysis zymogens to convert the non-soluble organic matters into soluble organic matters and micromolecular fatty acids.
In addition, the fermentation and sedimentation tank 430 comprises a fermentation and sedimentation tank body 4301, the side wall of the fermentation and sedimentation tank body 4301 is provided with a fermentation and sedimentation water inlet 4302, the upper part of the fermentation and sedimentation tank body 4301 is provided with an inclined plate or an inclined pipe 4303, the side wall or the upper part of the fermentation and sedimentation tank body 4301 is provided with a fermentation and sedimentation water outlet 4304, and the fermentation and sedimentation water outlet 4304 is connected with the mud-water separation device 440 through a pipeline; a liquid distribution pipe 4305 and a sludge collection hopper 4306 are arranged at the bottom of the fermentation and sedimentation tank body 4301, the liquid distribution pipe 4305 is positioned above the sludge collection hopper 4306, a sludge discharge pipe 4307 is arranged in the sludge collection hopper 4306, the sludge discharge pipe 4307 is connected with a fermentation and sedimentation sludge discharge port 4308 arranged on the side wall or the bottom of the fermentation and sedimentation tank body 4301, and the fermentation and sedimentation sludge discharge port 4308 is connected with a sludge storage tank 500;
the mud-water separation device 440 is provided with a separation water inlet 4401, a separation water outlet 4402 and a separation sludge outlet 4403, the separation water inlet 4401 of the mud-water separation device 440 is connected with the fermentation precipitation water outlet 4304 of the fermentation precipitation tank 430, the separation water outlet 4402 of the mud-water separation device 440 is connected with the multi-stage biological filter 300, and the separation sludge outlet 4403 is connected with the sludge storage tank 500.
The fermentation liquor is subjected to high-efficiency sludge-water separation treatment by a sludge-water separation device 440, most suspended matters in the fermentation liquor are removed as precipitated sludge, soluble organic matters such as SCOD (soluble organic compound) and VFAs (vacuum volatile organic compounds) are retained in the fermentation liquor, the concentration of suspended matters in supernatant of the fermentation liquor after the sludge-water separation treatment is less than 100mg/L, and the supernatant of the fermentation liquor can be directly recycled to the multistage biofilter 300 and used as a denitrification supplement carbon source for the biofilter, so that the effective recovery of the fermentation liquor is realized, the biochemical denitrification of a system is enhanced, and the purpose of saving an external carbon source and removing pollutants is achieved. And the sludge of the sludge-water separating device 440 can be discharged into the sludge storage tank 500 as discharged sludge.
Example 1
The method comprises the steps of taking primary sludge discharged from a high-density sedimentation tank of an urban sewage treatment plant which is connected with a multi-stage biological filter as a main process as sludge entering of a sludge fermentation system, and entering a sludge conditioning tank. The initial concentration of primary sludge is 50460mg/L, the sludge concentration after tempering is 24895mg/L, the concentration of dissolved organic matters in sludge supernatant is 3950mg/L, the sludge after tempering enters a sludge fermentation tank for anaerobic fermentation acidogenic reaction, the operating parameters of the fermentation tank are controlled to be pH 6.01-7.17, ORP-142.6 mv-228.5 mv, T is 20 ℃, the hydraulic retention time HRT of the fermented sludge in the fermentation tank is 4d, the sludge concentration of the fermented liquid after sludge fermentation is 18860mg/L, 30% volume ratio of the fermented liquid is refluxed and enters a sludge tempering tank as reflux sludge, and simultaneously, the fermentation liquor enters a high-efficiency sludge-water separation device for sludge-water separation, the concentration SCOD of soluble organic matters in the supernatant of the fermentation liquor after sludge-water separation is 10800mg/L, the total nitrogen concentration TN is 950mg/L, and the daily fermentation liquor is about 300 m.3The net COD yield is about 6.4 tons of 15 ten thousand mg/LCOD equivalent sodium acetate, the adding amount of a carbon source can be reduced by about 1/3, and the supernatant of the fermentation liquor is directly recycled to the multistage biofilter as the carbon source, so that the TN of the effluent of the multistage biofilter can be ensured to be 8-12 mg/L.
Example 2
The method comprises the steps of taking primary sludge discharged from a high-density sedimentation tank of an urban sewage treatment plant which is connected with a multi-stage biological filter as a main process as sludge entering of a sludge fermentation system, and entering a sludge conditioning tank. The initial concentration of primary sludge is 49320mg/L (MLSS), the concentration of modified sludge is 30080mg/L, the concentration of soluble organic matters in sludge supernatant is 1800mg/L, the modified sludge enters a sludge fermentation tank, anaerobic fermentation acid production reaction occurs, the operating parameters of the fermentation tank are controlled to be pH 6.74-7.40, ORP-169.6 mv-261.4 mv, T is 15 ℃, the hydraulic retention time HRT of fermented sludge in the fermentation tank is 4d, the concentration of fermented liquid sludge after sludge fermentation is 25860mg/L, 20% of fermented liquid is refluxed and enters a sludge modifying tank as refluxed sludge, the fermented liquid enters an efficient sludge-water separation device for sludge-water separation, the concentration of soluble organic matters in the fermented liquid supernatant after sludge-water separation is 6800 mg/LL, total nitrogen concentration TN 550mg/L, about 300m of fermentation liquor produced in daily life3The net COD yield is about 4.8 tons of 15 ten thousand mg/LCOD equivalent sodium acetate, the adding amount of a carbon source can be reduced by about 1/4, and the supernatant of the fermentation liquor is directly recycled to the multistage biofilter as the carbon source, so that the TN of the effluent of the multistage biofilter can be ensured to be 8-12 mg/L.
Example 3
Taking primary sludge discharged from a high-density sedimentation tank of a municipal sewage treatment plant of Qingdao, which takes a multi-stage biological filter as a main process, as sludge entering a sludge fermentation system and entering a sludge conditioning tank. The initial concentration of primary sludge is 42500mg/L, the concentration of modified sludge is 22700mg/L, the concentration of soluble organic matters in sludge supernatant is 2750mg/L, the modified sludge enters a sludge fermentation tank to perform anaerobic fermentation acid production reaction, the operating parameters of the fermentation tank are controlled to be pH 6.08-6.85, ORP-173.9 mv-190.4 mv, T is 20 ℃, the hydraulic retention time HRT of the fermented sludge in the fermentation tank is 4d, the concentration of the fermented sludge after sludge fermentation is 15560mg/L, 15% of fermented liquid is refluxed and enters a sludge modifying tank as refluxing sludge, the fermented liquid enters an efficient sludge-water separation device to perform sludge-water separation, the concentration of the soluble organic matters in the fermented liquid supernatant after sludge-water separation is 5800mg/L, the concentration of total nitrogen is 350mg/L, and the daily produced fermented liquid is 1000m3The COD yield is about 20 tons of 15 ten thousand mg/LCOD equivalent sodium acetate, the adding amount of a carbon source can be reduced by about 30 percent, and the supernatant of the fermentation liquor is directly recycled to the multistage biofilter as the carbon source, so that the TN of the effluent of the multistage biofilter can be ensured to be 7-12 mg/L.
The present invention and its embodiments have been described above schematically, the description is not restrictive, the data used are only one of the embodiments of the present invention, and the actual data combination is not limited to this. Therefore, if the person skilled in the art receives the teaching, the embodiments and examples similar to the above technical solutions shall not be designed in an inventive manner without departing from the spirit of the present invention, and shall fall within the protection scope of the present invention.
Claims (10)
1. The utility model provides a sewage treatment system of carbon source in utilization based on sludge fermentation, includes pretreatment tank (100), high density sedimentation tank (200) and multistage biological filter (300) in proper order, its characterized in that, still includes sludge fermentation unit (400), the mud discharging port of high density sedimentation tank (200) passes through the pipeline and links to each other with the mud inlet of sludge fermentation unit (400), and the outlet of sludge fermentation unit (400) passes through the pipeline and links to each other with the water inlet of multistage biological filter (300), sludge fermentation unit (400) are used for carrying out fermentation treatment to the primary sludge that high density sedimentation tank (200) discharged to the zymotic fluid that will ferment the processing production carries to multistage biological filter (300).
2. The sewage treatment system utilizing an internal carbon source based on sludge fermentation as claimed in claim 1, wherein: the sludge fermentation device further comprises a sludge storage tank (500), and a sludge discharge port of the sludge fermentation unit (400) is connected with a sludge inlet of the sludge storage tank (500) through a pipeline.
3. The sewage treatment system utilizing an internal carbon source based on sludge fermentation as claimed in claim 2, wherein: the sludge fermentation unit (400) sequentially comprises a sludge conditioning tank (410), a sludge fermentation tank (420), a fermentation sedimentation tank (430) and a sludge-water separation device (440), wherein sludge discharge ports of the fermentation sedimentation tank (430) and the sludge-water separation device (440) are connected with a sludge inlet of the sludge storage tank (500) through pipelines.
4. The sewage treatment system utilizing an internal carbon source based on sludge fermentation as claimed in claim 3, wherein: the sludge fermentation tank (420) comprises a fermentation tank body (4201), and a fermentation stirrer (4206) is arranged at the center of the top of the fermentation tank body (4201).
5. A sewage treatment method utilizing an internal carbon source based on sludge fermentation is characterized by comprising the following steps:
s10, pretreating the sewage in a pretreatment tank (100) to remove large-particle impurities to obtain pretreated sewage;
s20, carrying out coagulating sedimentation treatment on the pretreated sewage in a high-density sedimentation tank (200), and removing most organic matters in the sewage to obtain effluent and primary sludge of the sedimentation tank;
s30, sending the effluent of the sedimentation tank into a multi-stage biological filter (300) for biological denitrification and denitrification reaction to obtain the effluent after denitrification and denitrification;
s40, feeding the primary sludge into a sludge fermentation unit (400) for fermentation and acid production to obtain fermentation liquor and fermented sludge, and then feeding the fermentation liquor into a multi-stage biological filter (300) to be used as a supplementary carbon source for biological denitrification.
6. The method for treating sewage using internal carbon source based on sludge fermentation as claimed in claim 5, wherein: in step S40, the fermentation acid production process of the primary sludge includes: mixing and tempering the effluent after denitrification and the primary sludge in a sludge tempering tank (410) to obtain tempered primary sludge; then the modified sludge is subjected to fermentation acid production biochemical reaction in a sludge fermentation tank (420), so that non-soluble organic matters in the sludge are converted into soluble organic matters, and fermentation liquor and fermentation sludge containing the soluble organic matters are obtained; and (3) carrying out sludge-water separation treatment on the fermentation liquor in a sludge-water separation device (440), removing a large amount of suspended matters to obtain a fermentation liquor supernatant, and recycling the fermentation liquor supernatant to the multistage biofilter (300).
7. The method for treating sewage using internal carbon source based on sludge fermentation as claimed in claim 6, wherein: and (3) refluxing 10-30% of fermentation liquor in volume ratio, and feeding the refluxed sludge into a sludge conditioning tank (410).
8. The method for treating sewage using internal carbon source based on sludge fermentation as claimed in claim 6, wherein: and the mass concentration of the quenched and tempered primary sludge is 2-10%.
9. The method for treating sewage using internal carbon source based on sludge fermentation as claimed in claim 6, wherein: in the fermentation acidogenic biochemical reaction process, the ORP in the sludge fermentation tank (420) is controlled to be-350-50 mv, and the sludge fermentation retention time in the sludge fermentation tank (420) is 2-10 d.
10. The method for treating sewage using internal carbon source based on sludge fermentation as claimed in claim 6, wherein: the concentration of suspended matters in the supernatant of the fermentation liquor is controlled below 100 mg/L.
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