CN111635077A - Sewage treatment system for supplementing carbon source by sludge acid production and use method thereof - Google Patents

Sewage treatment system for supplementing carbon source by sludge acid production and use method thereof Download PDF

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CN111635077A
CN111635077A CN202010543314.1A CN202010543314A CN111635077A CN 111635077 A CN111635077 A CN 111635077A CN 202010543314 A CN202010543314 A CN 202010543314A CN 111635077 A CN111635077 A CN 111635077A
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tank
sludge
pipeline
sewage
water
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鞠花
刘佳元
谭新爱
张宇
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Dayu Environmental Protection Tianjin Co ltd
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Dayu Environmental Protection Tianjin 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
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
    • B01F27/00—Mixers with rotary stirring devices in fixed receptacles; Kneaders
    • B01F27/60—Mixers with rotary stirring devices in fixed receptacles; Kneaders with stirrers rotating about a horizontal or inclined axis
    • B01F27/70—Mixers with rotary stirring devices in fixed receptacles; Kneaders with stirrers rotating about a horizontal or inclined axis with paddles, blades or arms
    • 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
    • C02F1/20—Treatment of water, waste water, or sewage by degassing, i.e. liberation of dissolved gases
    • 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
    • C02F2201/00—Apparatus for treatment of water, waste water or sewage
    • C02F2201/002—Construction details of the apparatus
    • C02F2201/005—Valves
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F2203/00—Apparatus and plants for the biological treatment of water, waste water or sewage
    • C02F2203/006—Apparatus and plants for the biological treatment of water, waste water or sewage details of construction, e.g. specially adapted seals, modules, connections
    • 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
    • C02F2209/005—Processes using a programmable logic controller [PLC]
    • 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
    • C02F2209/10—Solids, e.g. total solids [TS], total suspended solids [TSS] or volatile solids [VS]
    • 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
    • C02F2209/12—Volatile Fatty Acids (VFAs)
    • 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
    • C02F2209/42—Liquid level
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F2305/00—Use of specific compounds during water treatment
    • C02F2305/06—Nutrients for stimulating the growth of microorganisms
    • 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
    • C02F3/30—Aerobic and anaerobic processes
    • C02F3/302—Nitrification and denitrification treatment

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  • Chemical & Material Sciences (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Hydrology & Water Resources (AREA)
  • Engineering & Computer Science (AREA)
  • Environmental & Geological Engineering (AREA)
  • Water Supply & Treatment (AREA)
  • Organic Chemistry (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Health & Medical Sciences (AREA)
  • Molecular Biology (AREA)
  • Purification Treatments By Anaerobic Or Anaerobic And Aerobic Bacteria Or Animals (AREA)

Abstract

The invention provides a sewage treatment system for supplementing carbon source by sludge acid production, which comprises a grid room, an adjusting tank, a deoxidizing tank, an anoxic tank, an aerobic tank, a sedimentation tank, a sludge storage tank, an air assembly and a phosphorus removal and chemical feeding device, wherein the adjusting tank is arranged between grids; the grids are communicated with the regulating pool; the regulating tank is connected to the anoxic tank through a water inlet pipeline; the deoxidation tank is communicated with the anoxic tank; the anoxic tank is communicated with the aerobic tank; a soft filler is arranged in the aerobic tank; the aerobic tank is connected to the deoxidizing tank through a mixed liquid return pipeline; the aerobic tank is communicated with the sedimentation tank; the sedimentation tank is connected to the sludge storage tank through a sludge inlet pipeline; the sludge storage tank is connected to the anoxic tank through an acidizing fluid return pipeline; the mud storage pool is connected with a mud discharge pipeline. The sewage treatment system for supplementing carbon source by sludge acid production has stable operation, good water outlet effect and energy saving. The invention provides a using method of a sewage treatment system for supplementing carbon sources by sludge acidogenesis, which optimizes the conditions of supplementing carbon sources by sludge acidogenesis.

Description

Sewage treatment system for supplementing carbon source by sludge acid production and use method thereof
Technical Field
The invention belongs to the technical field of sewage treatment, and particularly relates to a sewage treatment system for supplementing a carbon source by sludge acid production and a using method thereof.
Background
At present, rural domestic sewage has the problems that the effluent is difficult to reach the standard due to large change of water quality and water quantity, high nitrogen and phosphorus, long-term shortage of carbon source for inflow and the like. When rural domestic sewage is treated, a large amount of carbon sources such as glucose, sodium acetate and the like are often added, and the cost of the medicament alone causes the operation cost per ton of water to be high.
Aiming at the situations, the actual current situation and characteristics of the rural domestic sewage are combined, and the direction that the total nitrogen of the effluent of the rural domestic sewage is difficult to reach the standard is necessary, the necessary surplus sludge of the sewage treatment system is subjected to acidification treatment, so that a carbon source required by denitrification is supplemented, the operating cost is reduced, and the sludge reduction and recycling are realized.
Disclosure of Invention
In view of the above, one of the purposes of the present invention is to provide a sewage treatment system for supplementing carbon source to sludge acid production, so as to overcome the defect that the existing rural sewage treatment system needs to add a large amount of carbon source, so that the operation cost is high; the invention also aims to provide a using method of the sewage treatment system for supplementing carbon sources by sludge acid production, so as to determine the optimal acid production conditions of the sewage treatment system for supplementing carbon sources by sludge acid production.
In order to achieve the purpose, the technical scheme of the invention is realized as follows:
a sewage treatment system for supplementing carbon source by sludge acid production comprises a grid room, an adjusting tank, a main tank, a sludge storage tank, an acidizing fluid return pipeline, a sludge inlet pipeline, a water inlet pipeline, a mixed liquid return pipeline, an air assembly, a phosphorus removal and chemical adding device and a sludge discharge pipeline; a deoxidation tank, an anoxic tank, an aerobic tank and a sedimentation tank are sequentially arranged in the main tank through partition plates; the water outlet end of the grating chamber is communicated with the water inlet end of the adjusting tank; a sewage lifting pump is arranged in the regulating tank; the water outlet end of the sewage lifting pump is connected to the anoxic tank through the water inlet pipeline; a water through hole is formed in the upper part of the partition plate between the deoxidation tank and the anoxic tank; a water through hole is formed in the lower part of the partition plate between the anoxic tank and the aerobic tank; a soft filler is fixedly arranged in the aerobic tank; a mixed liquid reflux pump is arranged in the aerobic tank; the water outlet end of the mixed liquid reflux pump is connected to the bottom of the deoxidation tank through the mixed liquid reflux pipeline; a sawtooth overflow weir plate is arranged at the upper part of a partition plate between the aerobic tank and the sedimentation tank, and the sawtooth overflow weir plate is positioned in the aerobic tank; the water outlet end of the sawtooth overflow weir plate is connected to the sedimentation tank through a flow guide pipe; the upper part of one side of the sedimentation tank, which is far away from the aerobic tank, is provided with a water outlet weir plate; the bottom of the sedimentation tank is connected to the sludge storage tank through the sludge inlet pipeline; a pneumatic diaphragm dredge pump is arranged on the mud inlet pipeline; a guide cylinder is fixedly arranged at the water outlet end of the sludge inlet pipeline; MBBR suspended fillers are arranged in the sludge storage tank; an effluent weir is fixedly arranged at the upper part of the sludge storage pool; the water outlet end of the water outlet weir is connected to the anoxic tank through the acidizing fluid return pipeline; the sludge discharge pipeline is arranged at the bottom of the sludge storage pool.
Furthermore, stainless steel grids are arranged on the upper surface and the lower surface of the MBBR suspended filler; the guide cylinder comprises a galvanized steel pipe, and a bell mouth is arranged at the outlet of the galvanized steel pipe; a reflecting plate is fixedly connected below the bell mouth through a steel bar; the reflecting plate is umbrella-shaped, and the included angle between the reflecting plate and the horizontal plane is 10-20 degrees; the outlet of the galvanized steel pipe is positioned in the MBBR suspended filler; the lower end of the bell mouth is positioned above the stainless steel grid on the lower surface of the MBBR suspended filler; the reflecting plate is positioned below the stainless steel grid on the lower surface of the MBBR suspended filler.
Further, the air assembly comprises a fan; an air pipe is fixedly arranged at an air outlet of the fan; an aeration pipeline and a gas washing pipeline are arranged on the air outlet end of the air pipe in parallel; a micropore aeration device is fixedly arranged at the bottom of the aerobic tank; a long-handle filter head is arranged in the sedimentation tank; the air outlet end of the aeration pipeline is fixedly connected with the air inlet end of the microporous aeration device; the air outlet end of the air washing pipeline is fixedly connected with the air inlet end of the long-handle filter head.
Furthermore, an inclined tube filler is arranged in the middle of the sedimentation tank; a mud bucket is arranged at the bottom of the sedimentation tank; the installation position of the long-handle filter head is between the inclined tube filler and the mud bucket.
Further, the phosphorus removal and medicine feeding device comprises a medicine feeding barrel, and a metering pump is fixedly installed at the liquid outlet end of the medicine feeding barrel; the liquid outlet end of the metering pump is fixedly connected with a dosing pipeline; the liquid outlet end of the medicine feeding pipeline is positioned at the bottom of the aerobic tank.
Further, a floating ball liquid level switch is arranged in the regulating tank; the floating ball liquid level switch controls the start and stop of the sewage lifting pump through an electric control PLC system;
furthermore, an adjustable electric valve, a manual ball valve and an electromagnetic flowmeter are arranged on the acidizing fluid return pipeline; the electromagnetic flowmeter controls the opening angle of the adjustable electric valve through an electric control PLC system; and a second electromagnetic flowmeter is arranged on the water inlet pipeline.
Furthermore, a perforated water distribution pipe is fixedly connected with the water outlet end of the mixed liquid return pipeline; the perforated water distribution pipe is provided with a circular hole at an angle of 45 degrees downwards.
Furthermore, a sewage inlet pipe is arranged at the front end of the grid room; an artificial thick grating and a mechanical thin grating are sequentially arranged in the grating room from front to back; a slag hopper is arranged in the grating chamber.
Further, a first submersible mixer is arranged in the adjusting tank; a submersible water impeller is arranged in the anoxic tank; a second submersible mixer is arranged in the mud storage pool.
A use method of a sewage treatment system for supplementing carbon source by sludge acidogenesis comprises the following steps:
the method comprises the following steps: rural domestic sewage enters the grids for filtering after being collected by a pipe network;
step two: sewage enters a regulating tank, and after the first submersible mixer homogenizes and balances the sewage, the sewage in the regulating tank is introduced into an anoxic tank through a water inlet pipeline by a sewage lift pump;
step three: sewage enters an anoxic tank, a submersible water impeller slowly pushes and stirs, and denitrifying bacteria in the anoxic tank start denitrification reaction;
step four: sewage in the anoxic tank flows into the aerobic tank through water passing holes arranged at the lower part of a partition plate between the anoxic tank and the aerobic tank, and aerobic bacteria and nitrobacteria in the aerobic tank perform reactions such as BOD removal, nitrification and the like;
step five: the mixed liquid reflux pump leads the sewage in the aerobic tank into the bottom of the deoxidizing tank through a mixed liquid reflux pipeline, and the deoxidizing tank is hydraulically stirred by utilizing the lift of the mixed liquid reflux pump; the deoxidation tank removes dissolved oxygen in the reflux of the mixed liquor;
step six: the sewage in the deoxidizing tank overflows to the anoxic tank through water passing holes in the upper part of a partition plate between the deoxidizing tank and the anoxic tank to supplement nitrate required by denitrification reaction in the anoxic tank (4);
step seven: overflowing water in the aerobic tank flows into a flow guide pipe through a sawtooth overflow weir plate and flows into a water distribution area of the sedimentation tank through the flow guide pipe; sewage is precipitated in the sedimentation tank to generate mud-water separation, clear water is discharged upwards through the effluent weir plate, and precipitated sludge sliding down along the inclined tube filler is accumulated in the mud bucket;
step eight: the pneumatic diaphragm mud pump guides the precipitated sludge in the mud bucket to the mud storage tank through the mud inlet pipeline, and the sludge enters the mud storage tank through the guide cylinder; generating sludge acid production reaction in the sludge storage tank, decomposing protein and lipid in the residual sludge into small molecular organic matters, and then fermenting to produce acid to form volatile organic acid;
step nine: after the upper-layer acidizing fluid in the sludge storage tank is collected by the water outlet weir, the upper-layer acidizing fluid overflows to the anoxic tank through an acidizing fluid return pipeline by utilizing the height difference, a carbon source required by denitrification is supplemented, necessary organic carbon is provided for denitrifying bacteria in the anoxic tank, and the denitrification reaction in the anoxic tank is ensured;
step ten: the suction dredge periodically sucks the inorganic sludge at the bottom of the sludge storage pool through a sludge discharge pipeline, and carries out concentrated treatment on the sludge through concentration and dehydration.
Furthermore, in the first step, after large floating objects and suspended matters are filtered by the sewage through the artificial coarse grating, the water depth in front of the grating is ensured by opening and adjusting the valve, fine inorganic particles are filtered by the mechanical fine grating, grating slag is stored in the slag hopper, and people go down to the grating chamber through the steel ladder to carry out outward transportation of the grating slag regularly.
Further, in the fourth step, the fan blows external air into the air pipe, and the air is divided by the air pipe and then blown into the micropore aeration device through the aeration pipeline, so that micropore aeration and oxygenation are carried out on the aerobic tank; a biological film is formed on the surface of the soft filler hung in the aerobic tank, the soft filler prolongs the average residence time of microorganisms on the biological film, and the microbial population in the biological film can remove BOD and carry out nitration reaction to generate nitrate.
Further, in the fourth step, a metering pump introduces a phosphorus removing agent with a proper concentration in the chemical adding barrel into the front end of the aerobic tank; the aeration rolling action of the aeration device promotes the coagulation reaction, and the dephosphorization effect of the sewage is ensured.
Further, in the seventh step, in the long-term working process of the sedimentation tank, the sedimentation tank needs to be periodically air-washed, the fan blows external air into the air pipe, the air passes through the air-washing pipeline after being shunted by the air pipe, then the air can be injected into the long-handle filter head, and the sludge and microorganisms accumulated in the inclined pipe filler can be washed away by the gas sprayed by the long-handle filter head, so that the guarantee is provided for the standard SS of the effluent.
Further, in the step eight, the reflecting plate in the guide shell changes the flow direction of sludge, large-particle inorganic sludge which cannot produce acid is precipitated downwards, and lighter organic sludge is gradually accumulated upwards on the reflecting plate; the organic sludge is contacted with acid-producing bacteria on the MBBR filler in the sludge storage tank to generate sludge acid-producing reaction; the second submersible mixer provides slow stirring for the acid-producing reaction of acid-producing bacteria, which is beneficial to the full proceeding of the acid-producing reaction.
Further, in the second step, the second electromagnetic flow meter instantly and accumulatively measures the sewage treatment amount, and the amount of the residual sludge which needs to be discharged into the sludge storage tank is calculated according to the measured sewage treatment amount; in the ninth step, the backflow amount of the acidizing fluid is controlled by an adjustable electric valve, a manual ball valve and an electromagnetic flowmeter, the first electromagnetic flowmeter feeds the flow of the acidizing fluid back to the adjustable electric valve through a PLC (programmable logic controller) electric control system to adjust the flow, and the backflow amount of the acidizing fluid is adjusted by the manual ball valve in the debugging process; and calculating the ratio relation between the water inflow and the return flow of the acidizing fluid to be 180:1 according to the sewage treatment amount measured in the step two and the return flow of the acidizing fluid obtained in the step nine.
Further, in the step eight, collecting supernatant samples of the sludge storage pool under the working conditions of different residual sludge retention times, detecting the concentration of volatile fatty acid in the collected samples by using a liquid chromatograph, and drawing a data curve of the concentration of the volatile fatty acid changing along with the residual sludge retention time; collecting supernatant samples of a sludge storage pool and sludge samples of the sludge storage pool under different working conditions of the retention time of the excess sludge, detecting the concentration of total volatile organic acids in the collected supernatant samples by using a liquid chromatograph, calculating the corresponding excess sludge concentration value of the samples according to the collected sludge samples, and drawing data curves of the total volatile organic acid concentration along with the change of reaction time under the conditions of 5 different excess sludge concentrations; and determining the optimal acidification hydraulic retention time of the mud storage pool.
Compared with the prior art, the sewage treatment system for supplementing carbon source by sludge acidogenesis and the use method thereof have the following advantages:
(1) the sewage treatment system for supplementing carbon source by sludge acid production improves the sludge storage tank, so that the sludge storage tank has the functions of sludge storage and acid production, and MBBR suspended filler is arranged in the sludge storage tank, uses a carrier material with the density close to that of water, and can keep a suspended state under the minimum mixing power provided by a mechanical stirring and mixing device; the process integrates the characteristics of high efficiency, operation flexibility and strong impact load resistance; the advantages of the traditional fluidized bed and biological contact oxidation are combined, and the problems that a fixed bed reactor needs regular back washing, a fluidized bed needs to fluidize a carrier, and a submerged biological filter is easy to block and needs to clean fillers are solved; each carrier in the MBBR suspended filler has different biological species inside and outside, and acid-producing bacteria grow inside, so that each carrier is a micro-reactor, the acid-producing bacteria are fixed on the carrier, and a large amount of effective acid-producing microorganisms are not lost when inorganic sludge and an upper layer acidizing fluid are discharged and flow back, so that the treatment effect is improved; the acidification liquid after the sludge in the sludge storage tank produces acid is refluxed to supplement the carbon source in the anoxic tank, so that the operation cost generated by the additional carbon source is greatly saved; the system has the characteristics of complete integral structure, stable operation, good water outlet effect, energy consumption saving, long service life, full-automatic operation and the like;
(2) according to the sewage treatment system for supplementing carbon source by sludge acidogenesis, the soft filler is suspended in the aerobic tank, the biological film is formed on the surface of the soft filler, and the soft filler can prolong the average residence time of microorganisms on the biological film, so that a large number of microorganisms with longer generation time and smaller specific increment rate, such as nitrobacteria, can survive in the biological film, and the full implementation of nitration reaction is facilitated; in addition, the biomembrane in the aerobic tank has high adaptability to water quality and water quantity, and is particularly suitable for treating rural domestic sewage with frequent impact of water quality and water quantity load;
(3) according to the sewage treatment system for supplementing carbon source by sludge acid production, the microporous aeration device is arranged in the aerobic tank, the microporous aeration device can generate micro bubbles, the gas-liquid contact surface is large, the oxygen utilization rate is improved while the oxygen is supplied to the aerobic tank, and the oxygen utilization rate can reach more than 10%; in addition, the micropore aeration device and the phosphorus removal dosing device have a synergistic effect, and the aeration rolling effect of the micropore aeration device can promote the coagulation reaction of the phosphorus removal agent, so that the phosphorus removal effect of the sewage is ensured;
(4) according to the sewage treatment system for supplementing carbon source by sludge acid production, the inclined tube filler is arranged in the middle of the sedimentation tank, and is a honeycomb filler, so that the sedimentation effect is good; in addition, a long-handle filter head is arranged below the inclined tube, so that sludge and a microorganism accumulated in the inclined tube of the sedimentation tank can be periodically subjected to gas washing, and the effluent SS can reach the standard;
(5) according to the sewage treatment system for supplementing carbon sources by sludge acid production, the floating ball liquid level switch is arranged in the regulating tank and provided with the alarm liquid level, the highest liquid level and the lowest liquid level, and the start and stop of the sewage lifting pump can be controlled according to the liquid level position in the regulating tank through the floating ball liquid level switch;
(6) the sewage treatment system for supplementing carbon source to sludge acidogenesis is characterized in that an adjustable electric valve, a manual ball valve and an electromagnetic flowmeter are arranged on an acidification liquid return pipeline; the first electromagnetic flowmeter can feed back signals to the electric control PLC system, the electric control PLC system controls the adjustable electric valve to adjust the backflow amount of the acidizing fluid, and the degree of automation is high; the return flow of the acidizing fluid can be adjusted through a manual ball valve in the debugging process, so that the accuracy of controlling the return flow of the acidizing fluid is improved;
(7) according to the sewage treatment system for supplementing carbon source by sludge acid production, the second electromagnetic flowmeter is arranged on the water inlet pipeline, so that the sewage treatment capacity can be measured instantly and cumulatively;
(8) according to the sewage treatment system for supplementing carbon source by sludge acid production, the artificial coarse grating and the mechanical fine grating are sequentially arranged in the grating room from front to back; the artificial coarse grating is used for filtering large floating objects and suspended matters, and the mechanical fine grating is used for filtering fine inorganic particles; in addition, a slag hopper is arranged in the grid chamber, so that grid slag generated when water flows through the grids can be collected conveniently;
(9) according to the sewage treatment system for supplementing carbon source by sludge acid production, the submersible stirrer is arranged in the regulating reservoir, so that sewage can be homogenized and equalized; the submersible water impeller is arranged in the anoxic tank, and the impeller stirring of the submersible water impeller is beneficial to the full contact of microorganisms in the anoxic tank and sewage, so that the full progress of denitrification reaction is ensured; a submersible stirrer is arranged in the sludge storage tank, and the submersible stirrer provides slow stirring for the acid production reaction of acid-producing bacteria, so that the full reaction is facilitated;
(10) the use method of the sewage treatment system for supplementing carbon sources by sludge acid production comprises the steps of measuring the sewage treatment amount through an electromagnetic flowmeter, controlling the reflux amount of acidizing fluid by using an adjustable electric valve, a manual ball valve and the electromagnetic flowmeter, and optimizing the proportional relation between the water inflow and the reflux amount of the acidizing fluid; collecting a supernatant sample and a sludge sample of the sludge storage tank, detecting the concentration of volatile fatty acid and the concentration of total volatile organic acid in the sample by using a liquid chromatograph, and drawing a data curve of the concentration of volatile fatty acid changing along with the retention time of the residual sludge and a data curve of the concentration of total volatile organic acid changing along with the reaction time under the condition of different concentrations of the residual sludge, thereby optimizing the acidification hydraulic retention time of the sludge storage tank.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate an embodiment of the invention and, together with the description, serve to explain the invention and not to limit the invention. In the drawings:
FIG. 1 is a schematic diagram of a sewage treatment system for producing acid and supplementing carbon source by sludge according to the present invention;
2-4 are partial schematic views of a sewage treatment system for producing acid and supplementing carbon source by sludge according to the invention;
FIG. 5 is a schematic view of a draft tube according to the present invention;
FIG. 6 is a graph of the concentration of VFAs as a function of SRT;
FIG. 7 is a TVFA curve with reaction time under 5 different excess sludge concentration conditions.
Description of reference numerals:
a grid space 1; 1-1 of an artificial coarse grid; 1-2 of a mechanical fine grid; 1-3 of a slag hopper; 1-4 of steel ladder; 1-5 of a valve; a regulating reservoir 2; a first submersible mixer 2-1; 2-2 of a floating ball liquid level switch; 2-3 of a sewage lifting pump; a deoxidation tank 3; 3-1 of perforated water distribution pipes; an anoxic tank 4; 4-1 of a submersible water impeller; an aerobic tank 5; 5-1 of a micropore aeration device; 5-2 parts of soft filler; 5-3 parts of a mixed liquid reflux pump; 5-4 parts of a sawtooth overflow weir plate; 6-a sedimentation tank; 6-1 of inclined tube filler; 6-2 of a long-handle filter head; 6-3 of a mud bucket; 6-4 of a flow guide pipe; 6-5 of a first water outlet weir plate; a sludge storage tank 7; 7-1 parts of MBBR suspended filler; 7-2 of a second submersible mixer; an effluent weir 7-3; 7-4 of a guide shell; 7-4-1 of galvanized steel pipe; 7-4-2 of a bell mouth; 7-4-3 of steel bars; 7-4-4 of a reflecting plate; 7-5 parts of stainless steel grid; an acidizing fluid return line 8; an adjustable electric valve 8-1; a manual ball valve 8-2; a first electromagnetic flow meter 8-3; a sludge inlet pipeline 9; a pneumatic diaphragm dredge pump 9-1; a water inlet line 10; a second electromagnetic flow meter 10-1; a mixed liquid return line 11; an air component 12; a fan 12-1; an air duct 12-2; an aeration pipeline 12-3; 12-4 of a gas washing pipeline; 13-dephosphorization dosing pipeline; a metering pump 13-1; a dosing pipeline 13-2; 13-3 of a medicine adding barrel; a sludge discharge line 14; the suction dredge 14-1.
Detailed Description
It should be noted that the embodiments and features of the embodiments may be combined with each other without conflict.
In the description of the present invention, it is to be understood that the terms "center", "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", and the like, indicate orientations or positional relationships based on those shown in the drawings, and are used only for convenience in describing the present invention and for simplicity in description, and do not indicate or imply that the referenced devices or elements must have a particular orientation, be constructed and operated in a particular orientation, and thus, are not to be construed as limiting the present invention. Furthermore, the terms "first", "second", etc. are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first," "second," etc. may explicitly or implicitly include one or more of that feature. In the description of the present invention, "a plurality" means two or more unless otherwise specified.
In the description of the present invention, it should be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the present invention can be understood by those of ordinary skill in the art through specific situations.
The present invention will be described in detail below with reference to the embodiments with reference to the attached drawings.
As shown in fig. 1-5, a sewage treatment system for supplementing carbon source by sludge acidogenesis comprises a grid room 1, a regulating tank 2, a main tank, a sludge storage tank 7, an acidification liquid return pipeline 8, a sludge inlet pipeline 9, a water inlet pipeline 10, a mixed liquid return pipeline 11, an air assembly 12, a dephosphorization dosing device 13 and a sludge discharge pipeline 14; the installation modes of the grid room 1, the adjusting tank 2 and the main tank are all full underground, and the installation mode of the sludge storage tank 7 is half aboveground; the grid room 1, the adjusting tank 2 and the mud storage tank 7 are all structures with steel reinforced concrete structures; a deoxidation tank 3, an anoxic tank 4, an aerobic tank 5 and a sedimentation tank 6 are sequentially arranged in the main tank through partition plates;
the water outlet end of the grid room 1 is communicated with the water inlet end of the regulating pool 2; a sewage lift pump 2-3 is arranged in the adjusting tank 2; the water outlet end of the sewage lifting pump 2-3 is connected to the anoxic tank 4 through a water inlet pipeline 10; a water through hole is arranged at the upper part of the partition plate between the deoxidation tank 3 and the anoxic tank 4; a water through hole is formed in the lower part of the partition plate between the anoxic tank 4 and the aerobic tank 5; the aerobic tank 5 is internally and fixedly provided with soft fillers 5-2, so that the average residence time of microorganisms on the biological membrane can be prolonged; a mixed liquid reflux pump 5-3 is arranged in the aerobic tank 5; the water outlet end of the mixed liquid reflux pump 5-3 is connected to the bottom of the deoxidation tank 3 through a mixed liquid reflux pipeline 11; a sawtooth overflow weir plate 5-4 is arranged at the upper part of the partition plate between the aerobic tank 5 and the sedimentation tank 6, and the sawtooth overflow weir plate 5-4 is positioned in the aerobic tank 5; the water outlet end of the sawtooth overflow weir plate 5-4 is connected to the sedimentation tank 6 through the flow guide pipe 6-4; the upper part of one side of the sedimentation tank 6, which is far away from the aerobic tank 5, is provided with a water outlet weir plate 6-5; the bottom of the sedimentation tank 6 is connected to a sludge storage tank 7 through a sludge inlet pipeline 9; a pneumatic diaphragm dredge pump 9-1 is arranged on the dredge pipeline 9; a guide cylinder 7-4 is fixedly arranged at the water outlet end of the sludge inlet pipeline 9; the sludge storage tank 7 is internally provided with an MBBR suspended filler 7-1, the MBBR suspended filler 7-1 uses a carrier material (the relative density is 0.96) with the density close to that of water, and the MBBR suspended filler can keep a suspended state under the minimum mixing power provided by a mechanical stirring and mixing device; each carrier in the MBBR suspended filler has different biological species inside and outside, and acid-producing bacteria grow inside, so that each carrier is a micro-reactor, the acid-producing bacteria are fixed on the carrier, and a large amount of effective acid-producing microorganisms are not lost when inorganic sludge and an upper layer acidizing fluid are discharged and flow back, so that the treatment effect is improved; an effluent weir 7-3 is fixedly arranged at the upper part of the sludge storage tank 7; the water outlet end of the water outlet weir 7-3 is connected to the anoxic tank 4 through an acidizing fluid return pipeline 8; the sludge discharge pipeline 14 is arranged at the bottom of the sludge storage tank 7;
the adding ratio of the MBBR suspended filler is 20-30 percent; stainless steel grids 7-5 are arranged on the upper surface and the lower surface of the MBBR suspended filler 7-1 and are used for intensively fixing the MBBR suspended filler at the depth of 1/5-3/5 in the tank, so that when the MBBR suspended filler is not coated, the phenomenon of local filler accumulation is easy to occur in actual engineering; the size of the grid on the stainless steel grid 7-5 is 2cm multiplied by 2 cm; the guide shell 7-4 comprises a galvanized steel pipe 7-4-1, and a bell mouth 7-4-2 is arranged at an outlet of the galvanized steel pipe 7-4-1; a reflecting plate 7-4-4 is fixedly connected below the bell mouth 7-4-2 through a steel bar 7-4-3; the reflecting plate 7-4-4 is umbrella-shaped, and the included angle between the reflecting plate 7-4-4 and the horizontal plane is 10-20 degrees; the outlet of the galvanized steel pipe 7-4-1 is positioned in the MBBR suspended filler 7-1; the lower end of the bell mouth 7-4-2 is positioned above the stainless steel grid 7-5 on the lower surface of the MBBR suspended filler 7-1; the reflecting plate 7-4-4 is positioned below the stainless steel grid 7-5 on the lower surface of the MBBR suspended filler 7-1;
an air assembly 12 including a fan 12-1; an air outlet of the fan 12-1 is fixedly provided with an air pipe 12-2; an aeration pipeline 12-3 and an air washing pipeline 12-4 are arranged on the air outlet end of the air pipe 12-2 in parallel; the bottom of the aerobic tank 5 is fixedly provided with a micropore aeration device 5-1 which can generate micro bubbles, the gas-liquid contact surface is large, and the oxygen utilization rate is high and can reach more than 10 percent; a long-handle filter head 6-2 is arranged in the sedimentation tank 6; the air outlet end of the aeration pipeline 12-3 is fixedly connected with the air inlet end of the microporous aeration device 5-1; the air outlet end of the air washing pipeline 12-4 is fixedly connected with the air inlet end of the long-handle filter head 6-2;
the middle part of the sedimentation tank 6 is provided with an inclined tube filler 6-1, and the inclined tube filler 6-1 is a honeycomb filler with the diameter of 80 mm; a mud bucket 6-3 is arranged at the bottom of the sedimentation tank 6; the installation position of the long-handle filter head 6-2 is between the inclined tube filler 6-1 and the mud bucket 6-3;
the phosphorus removal and medicine feeding device 13 comprises a medicine feeding barrel 13-3, and a metering pump 13-1 is fixedly installed at the liquid outlet end of the medicine feeding barrel 13-3; the liquid outlet end of the metering pump 13-1 is fixedly connected with a dosing pipeline 13-2; the liquid outlet end of the medicine adding pipeline 13-2 is positioned at the bottom of the aerobic tank 5;
a floating ball liquid level switch 2-2 is arranged in the regulating tank 2, and the floating ball liquid level switch 2-2 is provided with an alarm liquid level, a highest liquid level and a lowest liquid level; the floating ball liquid level switch 2-2 is electrically connected with the electric control PLC system through a circuit, the electric control PLC system is electrically connected with the sewage lifting pump 2-3 through a circuit, the floating ball liquid level switch 2-2 transmits a signal to the electric control PLC system, and the electric control PLC system controls the starting and stopping of the sewage lifting pump 2-3;
an adjustable electric valve 8-1, a manual ball valve 8-2 and an electromagnetic flowmeter 8-3 are arranged on the acidizing fluid return pipeline 8; the electromagnetic flowmeter 8-3 is electrically connected with the electric control PLC system through a circuit, and the electric control PLC system is electrically connected with the adjustable electric valve 8-1 through a circuit; the first electromagnetic flowmeter 8-3 feeds back signals to the electric control PLC system, the electric control PLC system controls the adjustable electric valve 8-1 to adjust the reflux quantity of the acidizing fluid, and the reflux quantity of the acidizing fluid can be adjusted through the manual ball valve 8-2 in the debugging process;
the water inlet pipeline 10 is provided with a second electromagnetic flowmeter 10-1 which can instantaneously and accumulatively measure the sewage treatment capacity;
the water outlet end of the mixed liquid return pipeline 11 is fixedly connected with a perforated water distribution pipe 3-1; round holes with the diameter of 20mm are formed in the perforated water distribution pipe 3-1 at an angle of 45 degrees downwards, and the distance between the round holes is 150 mm; the perforated water distribution pipe 3-1 can ensure the stability of water inlet of the deoxidation tank 3;
a sewage inlet pipe is arranged at the front end of the grid room 1; an artificial thick grating 1-1 and a mechanical thin grating 1-2 are sequentially arranged in the grating room 1 from front to back; the artificial coarse grating 1-1 is used for filtering large floating objects and suspended matters, and the mechanical fine grating 1-2 is used for filtering fine inorganic particles; a slag hopper 1-3 is arranged in the grid room 1 and is used for collecting grid slag generated when water flows through the grid;
a first submersible mixer 2-1 is arranged in the adjusting tank 2, and can homogenize and equalize the amount of sewage; a submersible water impeller 4-1 is arranged in the anoxic tank 4, and the impeller stirring of the submersible water impeller 4-1 is beneficial to the full contact of microorganisms in the anoxic tank 4 and sewage, so that the denitrification reaction is fully carried out; a second submersible mixer 7-2 is arranged in the sludge storage tank 7, and the second submersible mixer 7-2 provides slow stirring for the acid-producing reaction of acid-producing bacteria, thereby being beneficial to the full reaction.
As shown in fig. 1-7, when rural domestic sewage is treated by using a sewage treatment system for producing acid and supplementing carbon source by sludge, the rural domestic sewage enters a grid room 1 after being collected by a pipe network, large floaters and suspended matters are filtered by an artificial coarse grid 1-1, the water depth in front of the grid can be ensured by opening and adjusting a valve 1-5, fine inorganic particles are filtered by a mechanical fine grid 1-2, grid slag is stored in a slag hopper 1-3, and people can go down to the grid room 1 through a steel ladder 1-4 to transport the grid slag;
then the sewage enters an adjusting tank 2, after the sewage is homogenized and equalized by a first submersible mixer 2-1, the sewage in the adjusting tank 2 is introduced into an anoxic tank 4 by a sewage lifting pump 2-3 through a water inlet pipeline 10, and the sewage treatment capacity is instantly and accumulatively measured by a second electromagnetic flow meter 10-1; the start and stop of the sewage lift pump 2-3 are realized by controlling the alarm liquid level, the highest liquid level and the lowest liquid level in the floating ball liquid level switch 2-2;
because the influent water provides a certain amount of carbon source for the denitrification reaction, the denitrifying bacteria in the anoxic tank 4 can start the denitrification reaction; under the action of slow plug flow stirring of the submersible water impeller 4-1, microorganisms in the anoxic tank 4 are fully contacted with sewage, so that the full progress of denitrification reaction is ensured;
sewage in the anoxic tank 4 flows into the aerobic tank 5 through water passing holes arranged at the lower part of a partition plate between the anoxic tank 4 and the aerobic tank 5, and aerobic bacteria and nitrobacteria in the aerobic tank 5 perform reactions such as BOD removal, nitrification and the like;
the fan 12-1 blows external air into the air pipe 12-2, and then the air is divided by the air pipe 12-2 and blown into the microporous aeration device 5-1 through the aeration pipeline 12-3, so that the microporous aeration and oxygenation are carried out on the aerobic tank 5; the micropore aeration device generates tiny bubbles, the gas-liquid contact surface is large, the oxygen utilization rate is high and can reach more than 10 percent;
a biological film is formed on the surface of the soft filler 5-2 suspended in the aerobic pool 5, and the soft filler 5-2 can prolong the average residence time of microorganisms on the biological film, so that a large number of microorganisms with longer generation time and smaller specific increment rate, such as nitrobacteria, can survive in the biological film, which is beneficial to the full implementation of nitration reaction, and the microbial population in the biological film can remove BOD and carry out nitration reaction to generate nitrate; in addition, the biomembrane in the aerobic tank 5 has high adaptability to water quality and water quantity, and is particularly suitable for treating rural domestic sewage with frequent impact of water quality and water quantity load;
a metering pump 13-1 introduces a phosphorus removing agent with a proper concentration in a medicine adding barrel 13-3 into the front end of the aerobic tank 5; the aeration rolling action of the aeration device 5-1 can promote the coagulation reaction, thereby ensuring the dephosphorization effect of the sewage;
the mixed liquid reflux pump 5-3 leads the sewage in the aerobic tank 5 into a perforated water distribution pipe 3-1 at the bottom of the deoxidation tank 3 through a mixed liquid reflux pipeline 11, and the sewage enters the deoxidation tank 3 through a round hole on the perforated water distribution pipe 3-1;
the effect of the deoxidation tank 3 arrangement is significant on denitrification because: in order to ensure the completeness and uniformity of aerobic aeration quantity and provide sufficient dissolved oxygen for aerobic microorganisms, the content of the dissolved oxygen required by the tail end of the aerobic tank 5 is more than 2mg/L, and when the deoxidation tank 3 is not arranged, the content of the dissolved oxygen carried by the mixed liquid directly entering the anoxic tank 4 exceeds the standard (is less than 0.5mg/L), so that the anoxic environment of the anoxic tank 4 is destroyed; the deoxidation tank 3 can remove dissolved oxygen in the reflux of the mixed liquor, and is beneficial to the denitrification reaction of the anoxic tank 4;
the sewage in the deoxidation tank 3 overflows to the anoxic tank 4 through a water through hole at the upper part of a partition plate between the deoxidation tank 3 and the anoxic tank 4 to supplement nitrate nitrogen for the anoxic tank 4, and the nitrate nitrogen is taken as an electron acceptor of denitrifying bacteria to be beneficial to the implementation of denitrification reaction;
overflowing effluent in the aerobic tank 5 flows into a flow guide pipe 6-4 through a sawtooth overflow weir plate 5-4 and flows into a sedimentation tank 6 through the flow guide pipe 6-4;
the sewage is precipitated in the sedimentation tank 6 to generate mud-water separation, the treated effluent is discharged from the effluent weir plate 6-5, and the precipitated sludge sliding down along the inclined tube filler 6-1 is accumulated in the mud bucket 6-3;
in the long-term working process of the sedimentation tank 6, the sedimentation tank 6 needs to be periodically subjected to air washing, an air blower 12-1 blows external air into an air pipe 12-2, the air is divided by the air pipe 12-2 and then passes through an air washing pipeline 12-4, then the air is injected into a long-handle filter head 6-2, and the long-handle filter head 6-2 sprays gas to wash away sludge and microorganisms accumulated in the inclined pipe filler 6-1, so that the standard reaching of SS of effluent is guaranteed;
the pneumatic diaphragm mud pump 9-1 leads the precipitated sludge in the mud bucket 6-3 to the mud storage tank 7 through the mud inlet pipeline 9, and the sludge enters the mud storage tank 7 through the guide cylinder 7-4; the reflecting plate 7-4-4 in the guide cylinder 7-4 can change the flow direction of sludge, which is beneficial to downward precipitation of large-particle inorganic sludge (incapable of producing acid), so that lighter organic sludge is gradually accumulated upwards on the reflecting plate 7-4-4; when the organic sludge on the reflecting plate 7-4-4 is accumulated to a certain degree, the organic sludge can contact acid-producing bacteria on the MBBR filler 7-1 in the sludge storage tank 7 to generate a sludge acid-producing reaction; the second submersible mixer 7-2 provides slow stirring for the acid-producing reaction of acid-producing bacteria, which is beneficial to the full proceeding of the acid-producing reaction;
in the sludge storage tank 7, proteins and lipids in the residual sludge are decomposed into small molecular organic matters, and then fermentation is carried out to produce acid to form Volatile Fatty Acids (VFAs), wherein the VFAs are easily degradable favorable substrates in the process of removing nutrient substances by a sewage biological method;
after the upper-layer acidizing fluid in the sludge storage tank 7 is collected by the water outlet weir 7-3, the upper-layer acidizing fluid overflows to the anoxic tank 4 through the acidizing fluid return pipeline 8 by utilizing the height difference, so that a carbon source required by denitrification can be supplemented, energy is provided for denitrifying bacteria in the anoxic tank 4, and the denitrification reaction is ensured to be carried out;
the backflow amount of the acidizing fluid is controlled by an adjustable electric valve 8-1, a manual ball valve 8-2 and an electromagnetic flow meter 8-3, the acidizing fluid is accurately metered and is guaranteed to be linked with water inflow at the same time, the flow of the acidizing fluid is fed back to an electric control PLC system by the first electromagnetic flow meter 8-3, the electric control PLC system controls the opening angle of the adjustable electric valve 8-1 to adjust the flow, and the backflow amount of the acidizing fluid can be adjusted by the manual ball valve 8-2 in the debugging process;
calculated by the water content of the residual sludge of 99 percent, the water content is 100m3The amount of excess sludge to be discharged into the sludge storage tank 7 per day on a/d sewage treatment scale is 2m3D, wherein the flow rate of the produced acidified liquid is 0.56m3And d. Due to the fact that certain load impact can be caused to system biochemistry when the backflow acidizing fluid is too high, and due to the fact that the backflow acidizing fluid is too low, VFAs in the acidizing fluid cannot be fully utilized. Therefore, the optimum flow proportion of the acidification liquid return line 8 for supplementing the carbon source for denitrification reaction needs to be determined, and the proportion relation between the water inflow and the acidification liquid return is determined to be 180:1 through experiments;
the inlet water of the anoxic tank 4 consists of three parts, namely domestic sewage lifted by the regulating tank 2, mixed liquor overflowing from the deoxidizing tank 3 to the anoxic tank 4 and acidizing fluid which is produced by the sludge storage tank 7 and then flows back to the anoxic tank 4;
the suction dredge 14-1 periodically sucks the inorganic sludge at the bottom of the sludge storage tank 7 through the sludge discharge pipeline 14, and carries out concentrated treatment of sludge concentration and dehydration.
In order to determine the optimal acidification Hydraulic Retention Time (HRT) of the sludge storage tank 7, supernatant samples of the sludge storage tank 7 under different excess Sludge Retention Time (SRT) working conditions are collected, a liquid chromatograph is used for detecting the concentration of Volatile Fatty Acids (VFAs) in the collected samples, and a curve (figure 6) of the concentration of the VFAs along with the SRT is drawn.
According to FIG. 6, the SRT produced VFAs with 4d, 8d, 12d, 16d, 4 SRT conditions at average concentrations of 174.33, 240.78, 263.33, 275.67mgCOD/gVSS, respectively. The concentration of total VFAs also increased somewhat with time. When SRT is changed from 4d → 8d, the concentration of VFAs is increased remarkably; the increase in concentration of VFAs gradually becomes slower in SRT from 8d → 12d → 16 d. In the case of a long residence time of excess sludge, methanogens acetate metabolize acetic acid as a substrate, consuming carbon Sources (VFAs) for the hypoxic hydrolysis acidification of the sludge, so that the concentration of VFAs decreases when SRT 16 d.
In a conventional A/O system, the SRT is generally 11-23 d, so that the SRT of the excess sludge of the conventional A/O system can be controlled to be 16d as the optimal acid production condition under the conditions of reasonable sludge discharge time and sludge discharge interval control, namely HRT 16 d.
In order to further optimize acid production conditions, the influence of different excess sludge concentrations on total volatile organic acid (TVFA) concentrations is explored, supernatant samples of the sludge storage tank 7 and sludge samples of the sludge storage tank 7 under different excess Sludge Retention Time (SRT) working conditions are collected at the same time, a liquid chromatograph is used for detecting the total volatile organic acid (TVFA) concentrations in the collected supernatant samples, residual sludge concentration values corresponding to the samples are measured according to the collected sludge samples, and TVFA change curves along with reaction time under 5 different excess sludge concentration conditions are drawn (fig. 7).
According to the graph 7, the sludge concentration is gradually increased from (i) to (v), the influence of different excess sludge concentrations on the acidification capacity is not greatly different from (i) to (iv), and the influence of the reaction time on the acidification capacity is more prominent.
In a certain excess sludge concentration range (i → i), the acidification capacity of the excess sludge is continuously increased along with the increase of the initial concentration of the sludge, which shows that the increase of the excess sludge concentration is beneficial to improving the hydrolysis capacity of the excess sludge; when the excess sludge concentration is at the fifth stage, the acidification ability of the excess sludge is reduced, which means that the excessive concentration of the excess sludge can inhibit the low-oxygen hydrolysis acidification degree of the sludge.
Under the condition of different excess sludge concentrations from No. I to No. II, the TVFA concentration is gradually increased slowly after the fermentation time exceeds 15d, and the optimal acidification reaction time within a certain excess sludge concentration range can be determined to be 15 d. Because the concentration of the residual sludge in the rural domestic sewage is basically stabilized in a small range, the influence of the concentration of the sludge on acidification is not considered in the system, and the optimal acid production condition can be achieved only by controlling the acidification fermentation time.
And finally determining the optimal acid production conditions of the sludge storage tank 7 by combining the following steps: HRT 15 d.
The sewage treatment system for supplementing carbon source by sludge acidogenesis is in an unattended state, so the designed retention time of the sludge storage tank 7 reaches 1-2 months, and the sludge storage tank has large volume, mainly because the residual sludge is not recycled and reduced. After the excess sludge is acidified and returned, the amount of sludge required to be pulled away by a suction dredge is reduced, in order to maximize acid production, the HRT of the sludge storage tank 7 is controlled to be 15d, the content of the generated TVFA is the maximum, and the content of the TVFA accounts for 40% of MLVSS.
At 100m3Taking the treatment capacity of the domestic sewage/d as an example, about 20.03kgSS/d is generated daily, the proportion of the mixed liquor volatile suspended solid concentration (MLVSS) to the total suspended solid concentration (MLSS) in the mixed liquor is 0.7 in unit volume of the mixed liquor, the total TVFA amount generated in the sludge storage tank 7 per day is 5.6kgCOD/d under the condition of HRT (15 d), the total influent water nitrogen of the rural domestic sewage is higher, additional carbon sources such as glucose, sodium acetate and the like are required, theoretically, the amount of external carbon sources (calculated by COD) required for denitrifying 1kg of nitrate nitrogen is 5kgCOD/(kg of nitrate nitrogen), the average influent water COD content of the rural domestic sewage is generally about 300mg/L, generally, about 60mg/L of total influent nitrogen can be removed after the COD of the influent water is utilized, the average influent TN content of the influent water is generally about 100mg/L, and the effluent is about 15 TN (total nitrogen) required in first-grade GB 18918A (2002) of municipal sewage treatment plant, and the effluent is about 15 TN (2002) of town sewage treatment plant pollutant discharge standard is satisfied The requirement of the effluent of mg/L requires an additional carbon source of 12.5kgCOD/d, so the acidification liquid flows backThe ratio of the supplementary carbon source to the required external carbon source is 5.6/12.54-44.8%, so that the operation cost caused by the external carbon source is greatly 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 (10)

1. A sewage treatment system for supplementing carbon source by sludge acidogenesis is characterized in that: the device comprises a grid room (1), an adjusting tank (2), a main tank, a sludge storage tank (7), an acidizing fluid return pipeline (8), a sludge inlet pipeline (9), a water inlet pipeline (10), a mixed liquid return pipeline (11), an air assembly (12), a phosphorus removal and medicine adding device (13) and a sludge discharge pipeline (14); a deoxidation tank (3), an anoxic tank (4), an aerobic tank (5) and a sedimentation tank (6) are sequentially arranged in the main box through partition plates;
the water outlet end of the grid room (1) is communicated with the water inlet end of the regulating pool (2); a sewage lifting pump (2-3) and a first submersible mixer (2-1) are arranged in the adjusting tank (2); the water outlet end of the sewage lifting pump (2-3) is connected to the anoxic tank (4) through the water inlet pipeline (10); a submersible water impeller (4-1) is arranged in the anoxic tank (4); a water through hole is formed in the upper part of the partition plate between the deoxidation tank (3) and the anoxic tank (4); a water through hole is formed in the lower part of the partition plate between the anoxic tank (4) and the aerobic tank (5); a soft filler (5-2) is fixedly arranged in the aerobic tank (5); a mixed liquid reflux pump (5-3) is arranged in the aerobic tank (5); the water outlet end of the mixed liquid reflux pump (5-3) is connected to the bottom of the deoxidation tank (3) through the mixed liquid reflux pipeline (11); a sawtooth overflow weir plate (5-4) is arranged at the upper part of the partition plate between the aerobic tank (5) and the sedimentation tank (6), and the sawtooth overflow weir plate (5-4) is positioned in the aerobic tank (5); the water outlet end of the sawtooth overflow weir plate (5-4) is connected to the sedimentation tank (6) through a flow guide pipe (6-4); the upper part of one side of the sedimentation tank (6) far away from the aerobic tank (5) is provided with a water outlet weir plate (6-5); the bottom of the sedimentation tank (6) is connected to the sludge storage tank (7) through the sludge inlet pipeline (9); a pneumatic diaphragm mud pump (9-1) is arranged on the mud inlet pipeline (9); a guide cylinder (7-4) is fixedly arranged at the water outlet end of the sludge inlet pipeline (9); an MBBR suspended filler (7-1) and a second submersible mixer (7-2) are arranged in the sludge storage tank (7); an effluent weir (7-3) is fixedly arranged at the upper part of the sludge storage tank (7); the water outlet end of the water outlet weir (7-3) is connected to the anoxic tank (4) through the acidizing fluid return pipeline (8); the sludge discharge pipeline (14) is arranged at the bottom of the sludge storage pool (7).
2. The sewage treatment system for replenishing carbon source for acid production by sludge as claimed in claim 1, wherein: stainless steel grids (7-5) are arranged on the upper surface and the lower surface of the MBBR suspended filler (7-1); the guide cylinder (7-4) comprises a galvanized steel pipe (7-4-1), and a bell mouth (7-4-2) is arranged at the outlet of the galvanized steel pipe (7-4-1); a reflecting plate (7-4-4) is fixedly connected below the bell mouth (7-4-2) through a steel bar (7-4-3); the reflecting plate (7-4-4) is umbrella-shaped, and the included angle between the reflecting plate (7-4-4) and the horizontal plane is 10-20 degrees; the outlet of the galvanized steel pipe (7-4-1) is positioned in the MBBR suspended filler (7-1); the lower end of the bell mouth (7-4-2) is positioned above the stainless steel grid (7-5) on the lower surface of the MBBR suspended filler (7-1); the reflecting plate (7-4-4) is positioned below the stainless steel grid (7-5) on the lower surface of the MBBR suspended filler (7-1).
3. The sewage treatment system for replenishing carbon source for acid production by sludge as claimed in claim 1, wherein: the air assembly (12) comprises a fan (12-1); an air outlet of the fan (12-1) is fixedly provided with an air pipe (12-2); an aeration pipeline (12-3) and an air washing pipeline (12-4) are arranged on the air outlet end of the air pipe (12-2) in parallel; a microporous aeration device (5-1) is fixedly arranged at the bottom of the aerobic tank (5); a long-handle filter head (6-2) is arranged in the sedimentation tank (6); the air outlet end of the aeration pipeline (12-3) is fixedly connected with the air inlet end of the microporous aeration device (5-1); the air outlet end of the air washing pipeline (12-4) is fixedly connected with the air inlet end of the long-handle filter head (6-2); an inclined tube filler (6-1) is arranged in the middle of the sedimentation tank (6); a mud bucket (6-3) is arranged at the bottom of the sedimentation tank (6); the installation position of the long-handle filter head (6-2) is between the inclined tube filler (6-1) and the mud bucket (6-3).
4. The sewage treatment system for replenishing carbon source for acid production by sludge as claimed in claim 1, wherein: the phosphorus removal and medicine feeding device (13) comprises a medicine feeding barrel (13-3), and a metering pump (13-1) is fixedly installed at the liquid outlet end of the medicine feeding barrel (13-3); a dosing pipeline (13-2) is fixedly connected with the liquid outlet end of the metering pump (13-1); the liquid outlet end of the medicine feeding pipeline (13-2) is positioned at the bottom of the aerobic tank (5).
5. The sewage treatment system for replenishing carbon source for acid production by sludge as claimed in claim 1, wherein: a floating ball liquid level switch (2-2) is arranged in the regulating tank (2); the floating ball liquid level switch (2-2) controls the sewage lifting pump (2-3) to start and stop through an electric control PLC system;
an adjustable electric valve (8-1), a manual ball valve (8-2) and an electromagnetic flowmeter (8-3) are arranged on the acidizing fluid return pipeline (8); the electromagnetic flow meter (8-3) controls the opening angle of the adjustable electric valve (8-1) through an electric control PLC system; and a second electromagnetic flowmeter (10-1) is arranged on the water inlet pipeline (10).
6. The sewage treatment system for replenishing carbon source for acid production by sludge as claimed in claim 1, wherein: a sewage inlet pipe is arranged at the front end of the grid room (1); an artificial thick grating (1-1) and a mechanical thin grating (1-2) are sequentially arranged in the grating room (1) from front to back; a slag hopper (1-3) is arranged in the grid room (1).
7. A use method of a sewage treatment system for supplementing carbon source by sludge acidogenesis comprises the following steps:
the method comprises the following steps: rural domestic sewage is collected by a pipe network and then enters the grid room (1) for filtering;
step two: sewage enters a regulating tank (2), the first submersible mixer (2-1) homogenizes and homogenizes the sewage, and then a sewage lifting pump (2-3) introduces the sewage in the regulating tank (2) into an anoxic tank (4) through a water inlet pipeline (10);
step three: sewage enters an anoxic tank (4), a submersible water impeller (4-1) slowly pushes and stirs, denitrifying bacteria in the anoxic tank (4) start denitrifying denitrification reaction;
step four: sewage in the anoxic tank (4) flows into the aerobic tank (5) through a water passing hole arranged at the lower part of the partition plate between the anoxic tank (4) and the aerobic tank (5), and aerobic bacteria and nitrobacteria in the aerobic tank (5) perform reactions such as BOD removal, nitrification and the like;
step five: the mixed liquid reflux pump (5-3) leads the sewage in the aerobic pool (5) into the bottom of the deoxidation pool (3) through the mixed liquid reflux pipeline (11), and the hydraulic stirring of the deoxidation pool (3) is carried out by utilizing the lift of the mixed liquid reflux pump (5-3); the deoxidation tank (3) removes dissolved oxygen in the reflux of the mixed solution;
step six: the sewage in the deoxidizing tank (3) overflows to the anoxic tank (4) through a water through hole at the upper part of a partition plate between the deoxidizing tank (3) and the anoxic tank (4) to supplement nitrate required by denitrification reaction of the anoxic tank (4);
step seven: the overflow effluent in the aerobic tank (5) flows into a flow guide pipe (6-4) through a sawtooth overflow weir plate (5-4) and flows into a water distribution area of a sedimentation tank (6) through the flow guide pipe (6-4);
sewage is precipitated in the sedimentation tank (6) to generate mud-water separation, clear water is discharged upwards through the water outlet weir plate (6-5), and precipitated sludge sliding down along the inclined tube filler (6-1) is accumulated in the mud bucket (6-3);
step eight: the pneumatic diaphragm mud pump (9-1) leads the precipitated sludge in the mud bucket (6-3) to the mud storage pool (7) through the mud inlet pipeline (9);
the sludge enters a sludge storage pool (7) through a guide cylinder (7-4); the sludge acidogenic reaction is carried out in the sludge storage tank (7), the protein and lipid in the residual sludge are decomposed into small molecular organic matters, and then the volatile organic acid is formed by fermentation acidogenic reaction;
step nine: after the upper-layer acidizing fluid in the sludge storage tank (7) is collected by the water outlet weir (7-3), the upper-layer acidizing fluid overflows to the anoxic tank (4) through the acidizing fluid return pipeline (8) by utilizing the height difference to supplement a carbon source required by denitrification, so that necessary organic carbon is provided for denitrifying bacteria in the anoxic tank (4), and the denitrification reaction in the anoxic tank (4) is ensured;
step ten: the suction dredge (14-1) periodically sucks the inorganic sludge at the bottom of the sludge storage pool (7) through the sludge discharge pipeline (14) to carry out concentrated treatment of sludge concentration and dehydration.
8. The use method of the sewage treatment system for producing acid and supplementing carbon source by sludge as claimed in claim 7, wherein the method comprises the following steps: in the first step, after large floaters and suspended matters are filtered by the sewage through an artificial coarse grating (1-1), the water depth in front of the grating is ensured by opening and adjusting a valve (1-5), fine inorganic particles are filtered by a mechanical fine grating (1-2), grating slag is stored in a slag hopper (1-3), and people go down to a grating room (1) through a steel ladder (1-4) to carry out outward transportation of the grating slag periodically;
in the fourth step, the fan (12-1) blows external air into the air pipe (12-2), and the air is divided by the air pipe (12-2) and blown into the micropore aeration device (5-1) through the aeration pipeline (12-3) to realize micropore aeration and oxygenation on the aerobic pool (5); a biological film is formed on the surface of the soft filler (5-2) hung in the aerobic pool (5), the soft filler (5-2) prolongs the average residence time of microorganisms on the biological film, and the microbial population in the biological film can remove BOD and carry out nitration reaction to generate nitrate;
in the fourth step, a metering pump (13-1) introduces a phosphorus removing agent with a proper concentration in a medicine adding barrel (13-3) into the front end of the aerobic tank (5); the aeration rolling action of the aeration device (5-1) promotes the coagulation reaction, and the dephosphorization effect of the sewage is ensured;
in the seventh step, in the long-term working process of the sedimentation tank (6), the sedimentation tank (6) needs to be periodically air-washed, an air blower (12-1) blows external air into an air pipe (12-2), the air is divided by the air pipe (12-2) and then passes through an air-washing pipeline (12-4), then the air can be injected into a long-handle filter head (6-2), and the long-handle filter head (6-2) sprays gas to flush away sludge and microorganisms accumulated in the inclined pipe filler (6-1), so that the standard of SS of effluent is guaranteed;
in the step eight, the reflecting plate (7-4-4) in the guide cylinder (7-4) changes the flow direction of sludge, large-particle inorganic sludge which cannot produce acid is precipitated downwards, and lighter organic sludge is gradually accumulated upwards on the reflecting plate (7-4-4); the organic sludge contacts acid-producing bacteria on the MBBR filler (7-1) in the sludge storage tank (7) to generate sludge acid-producing reaction; the second submersible mixer (7-2) provides slow stirring for the acid-producing reaction of acid-producing bacteria, which is beneficial to the full proceeding of the acid-producing reaction.
9. The use method of the sewage treatment system for producing acid and supplementing carbon source by sludge as claimed in claim 7, wherein the method comprises the following steps: in the second step, the second electromagnetic flowmeter (10-1) instantaneously and accumulatively measures the sewage treatment amount, and calculates the amount of the residual sludge which needs to be discharged into the sludge storage tank (7) according to the measured sewage treatment amount; in the ninth step, the backflow amount of the acidizing fluid is controlled by an adjustable electric valve (8-1), a manual ball valve (8-2) and an electromagnetic flowmeter (8-3), the first electromagnetic flowmeter (8-3) feeds the flow of the acidizing fluid back to a PLC electric control system, the PLC electric control system controls the opening angle of the adjustable electric valve (8-1) to adjust the flow, and the backflow amount of the acidizing fluid is adjusted by the manual ball valve (8-2) in the debugging process; and calculating the ratio relation between the water inflow and the return flow of the acidizing fluid to be 180:1 according to the sewage treatment amount measured in the step two and the return flow of the acidizing fluid obtained in the step nine.
10. The use method of the sewage treatment system for producing acid and supplementing carbon source by sludge as claimed in claim 7, wherein the method comprises the following steps: in the step eight, collecting supernatant samples of the sludge storage pool (7) under the working conditions of different residual sludge retention times, detecting the concentration of volatile fatty acid in the collected samples by using a liquid chromatograph, and drawing a data curve of the concentration of the volatile fatty acid changing along with the residual sludge retention time; simultaneously collecting supernatant samples of the sludge storage pool (7) and sludge samples of the sludge storage pool (7) under different residual sludge retention time working conditions, detecting the concentration of total volatile organic acids in the collected supernatant samples by using a liquid chromatograph, calculating residual sludge concentration values corresponding to the samples according to the collected sludge samples, and drawing data curves of the total volatile organic acid concentration along with the change of reaction time under 5 different residual sludge concentration conditions; and determining the optimal acidification hydraulic retention time of the sludge storage pool (7).
CN202010543314.1A 2020-06-15 2020-06-15 Sewage treatment system for supplementing carbon source by sludge acid production and use method thereof Pending CN111635077A (en)

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