CN112028320A - System for treating sludge anaerobic digestion liquid through acidless Fenton oxidation and treatment method of sludge anaerobic digestion liquid - Google Patents
System for treating sludge anaerobic digestion liquid through acidless Fenton oxidation and treatment method of sludge anaerobic digestion liquid Download PDFInfo
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- 230000003647 oxidation Effects 0.000 title claims abstract description 118
- 239000010802 sludge Substances 0.000 title claims abstract description 101
- 230000029087 digestion Effects 0.000 title claims abstract description 68
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- RUTXIHLAWFEWGM-UHFFFAOYSA-H iron(3+) sulfate Chemical compound [Fe+3].[Fe+3].[O-]S([O-])(=O)=O.[O-]S([O-])(=O)=O.[O-]S([O-])(=O)=O RUTXIHLAWFEWGM-UHFFFAOYSA-H 0.000 claims description 8
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F9/00—Multistage treatment of water, waste water or sewage
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- 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
- C02F1/5236—Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities using inorganic agents
-
- 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
-
- 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
- C02F1/54—Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities using organic material
- C02F1/56—Macromolecular compounds
-
- 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
- C02F1/66—Treatment of water, waste water, or sewage by neutralisation; pH adjustment
-
- 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
- C02F1/72—Treatment of water, waste water, or sewage by oxidation
- C02F1/722—Oxidation by peroxides
-
- 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
- C02F1/72—Treatment of water, waste water, or sewage by oxidation
- C02F1/725—Treatment of water, waste water, or sewage by oxidation by catalytic oxidation
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F2001/007—Processes including a sedimentation step
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2305/00—Use of specific compounds during water treatment
- C02F2305/02—Specific form of oxidant
- C02F2305/026—Fenton's reagent
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- Life Sciences & Earth Sciences (AREA)
- Hydrology & Water Resources (AREA)
- Engineering & Computer Science (AREA)
- Environmental & Geological Engineering (AREA)
- Water Supply & Treatment (AREA)
- Chemical & Material Sciences (AREA)
- Organic Chemistry (AREA)
- Treatment Of Water By Oxidation Or Reduction (AREA)
- Separation Of Suspended Particles By Flocculating Agents (AREA)
Abstract
The invention discloses a system for treating anaerobic sludge digestion liquid by acidless Fenton oxidation and a treatment method of the anaerobic sludge digestion liquid. The system comprises: the device comprises a regulating tank, a coagulating sedimentation device, a Fenton catalytic oxidation device and a neutralization sedimentation device. The method comprises the following steps: introducing sludge anaerobic digestion liquid into the regulating tank; conveying the sludge anaerobic digestion liquid in the regulating tank into a coagulating sedimentation device for coagulating sedimentation treatment; conveying the effluent after the coagulating sedimentation treatment into a Fenton catalytic oxidation device for Fenton catalytic oxidation treatment; part of the effluent subjected to the Fenton catalytic oxidation treatment flows back to the water inlet end of the Fenton catalytic oxidation tank, and the rest of the effluent enters a neutralization and precipitation device; and the rest of effluent entering the neutralization and precipitation device is subjected to pH adjustment in a neutralization and precipitation tank and then is subjected to neutralization and precipitation treatment. The invention realizes acidification-free treatment, reduces the dosage of Fenton reaction medicament, reduces the operation cost, and improves the utilization efficiency of hydroxyl free radicals and the removal rate of organic matters.
Description
Technical Field
The invention belongs to the technical field of sewage treatment, and particularly relates to a system for treating anaerobic sludge digestion liquid by acidless Fenton oxidation and a treatment method of the anaerobic sludge digestion liquid.
Background
The anaerobic digestion technology of the sludge is one of the main technologies for recycling the sludge at present, and after the sludge is subjected to anaerobic digestion, organic components are decomposed by methanogens to generate methane, water and carbon dioxide. In order to improve the organic components in the sludge, before the thermal hydrolysis technology is used as a sludge pretreatment technology in the anaerobic digestion process of the sludge, the sludge is subjected to thermal hydrolysis treatment, cell wall breaking and intracellular substances flow out, so that the concentration of organic matters in anaerobic digestion feed can be increased. However, in the process of increasing temperature and pressure in the thermal hydrolysis process, substances such as proteins and polysaccharides contained in the sludge undergo chemical reactions such as caramelization reaction and maillard reaction, so that the concentration of soluble refractory organic matters is increased. The refractory organic matters can not be biologically utilized in the anaerobic digestion process of the sludge, and can enter the plate-frame filtrate after the anaerobic digestion of the sludge along with soluble humic acid and fulvic acid in the sludge, so that the treatment difficulty of the anaerobic digestion liquid of the sludge is increased.
A large number of experiments show that the traditional biological treatment technology is difficult to remove organic matters in anaerobic digestion of sludge. The advanced oxidation technology mainly producing hydroxyl radicals (. OH) has specific advantages in removing refractory organics, and the Fenton technology is most widely applied. The Fenton reaction is the utilization of Fe2+Catalysis H2O2Produce strong oxidizing OH, OH is nonselective and can be oxidizedThe organic polymer conjugated system structure is broken, and the persistent refractory organic matter is mineralized into carbon dioxide and water. However, the Fenton reaction needs to be carried out in an acidic environment, acid addition is an essential step in the Fenton reaction, and the large dosage of the medicament is one of the main disadvantages of the Fenton process, so that the development of a low-consumption acidification-free Fenton treatment process for treating the sludge anaerobic digestion solution is one of the important works of the current digestion solution treatment.
Disclosure of Invention
The invention aims to overcome the defects of the prior art and provide a sludge anaerobic digestion liquid treatment process and system which are low in treatment cost, free of additional acid and good in treatment effect.
In order to accomplish the above objects, an aspect of the present invention provides a system for treating anaerobic sludge digestion liquid by acidless fenton oxidation, comprising in sequence: equalizing basin, coagulating sedimentation device, fenton catalytic oxidation device and neutralization sedimentation device, wherein:
the coagulating sedimentation device comprises: a coagulating sedimentation tank, a coagulant dosing pump and a coagulant aid dosing pump; the coagulating sedimentation tank is communicated with the regulating tank, and the front end of the coagulating sedimentation tank is provided with the coagulant dosing pump and the coagulant aid dosing pump;
the Fenton catalytic oxidation device comprises: a Fenton catalytic oxidation tank and a dosing unit; the Fenton catalytic oxidation tank is communicated with the coagulating sedimentation tank, a tail water return pipe is arranged at the water outlet end of the Fenton catalytic oxidation tank and is communicated with the water inlet end of the Fenton catalytic oxidation tank through a tail water return pump, and the dosing unit is used for dosing a medicament into the Fenton catalytic oxidation tank;
the neutralization and precipitation device comprises: an alkali pump, a pH control unit and a neutralization sedimentation tank; the neutralization sedimentation tank is communicated with the Fenton catalytic oxidation tank, an alkali adding pump is arranged at the front end of the neutralization sedimentation tank, and the alkali adding pump is connected with the pH control unit.
Preferably, the connection between the alkali adding pump and the pH control unit is an electrical connection or a communication connection.
The water outlet end of the Fenton catalytic oxidation tank refers to the water outlet end at the tail end of the Fenton catalytic oxidation tank, and the water inlet end of the Fenton catalytic oxidation tank refers to the water inlet end at the front end of the Fenton catalytic oxidation tank. The Fenton catalytic oxidation tank is a plug flow type reactor and is made of 316L stainless steel or a cement tank with an anticorrosive coating.
According to the invention, preferably:
a plurality of medicament mixing areas and a plurality of reaction areas are alternately arranged in the Fenton catalytic oxidation tank in sequence; each reaction area and the medicament mixing area arranged at the front part of the reaction area are separated by a second partition plate, the upper part of the second partition plate is provided with a first opening, each reaction area and the medicament mixing area arranged at the rear part of the reaction area are separated by a third partition plate, and the lower part of the third partition plate is provided with a second opening;
the medicaments added in the first medicament mixing zone of the plurality of medicament mixing zones are hydrogen peroxide and ferrous sulfate aqueous solution, and the medicaments added in other medicament mixing zones are only ferrous sulfate aqueous solution; a second stirrer is arranged in each medicament mixing area; the first reagent mixing area is communicated with the coagulating sedimentation tank;
the lower parts of the plurality of reaction zones are respectively provided with a second sludge collecting groove, the bottom of each second sludge collecting groove is provided with a second emptying valve, a catalyst bearing layer is arranged above each second sludge collecting groove, and catalysts are placed on the catalyst bearing layers;
the medicine adding units comprise a plurality of medicine adding units, and the medicine adding units are used for adding medicines to the medicine mixing areas; and the first dosing units of the dosing units are used for adding hydrogen peroxide and ferrous sulfate aqueous solutions into the first medicament mixing area, and the other dosing units are respectively used for adding ferrous sulfate aqueous solutions into the other medicament mixing areas.
According to the invention, preferably:
the first dosing unit comprises a ferrous sulfate dosing pipe, a hydrogen peroxide dosing pump and a ferrous sulfate dosing pump; the hydrogen peroxide dosing pump is connected with the hydrogen peroxide dosing pipe and used for conveying hydrogen peroxide to the hydrogen peroxide dosing pipe; the ferrous sulfate dosing pump is connected with the ferrous sulfate dosing pipe and is used for conveying a ferrous sulfate aqueous solution to the ferrous sulfate dosing pipe; the ferrous sulfate dosing pipe and the hydrogen peroxide dosing pipe of the first dosing unit are both communicated with the first medicament mixing area;
the other dosing units comprise ferrous sulfate dosing pipes and ferrous sulfate dosing pumps; the ferrous sulfate dosing pump is connected with the ferrous sulfate dosing pipe and is used for conveying a ferrous sulfate aqueous solution to the ferrous sulfate dosing pipe; and ferrous sulfate dosing pipes of the other dosing units are respectively communicated with the other medicament mixing areas.
In the invention, the ferrous sulfate dosing pipe and the hydrogen peroxide dosing pipe of the first dosing unit are both communicated with the first medicament mixing area in a mode of being arranged on the side wall of the first medicament mixing area. And ferrous sulfate dosing pipes of the other dosing units are communicated with the other medicament mixing areas respectively in a mode of being arranged on the side walls of the other medicament mixing areas.
According to the present invention, preferably, the medicament mixing zone, the reaction zone and the dosing unit are all four.
According to the invention, preferably, the coagulation sedimentation tank is a counter-current sedimentation tank or a lateral-current sedimentation tank.
According to the invention, preferably:
the coagulating sedimentation tank sequentially comprises a coagulating area and a first sedimentation area, the coagulating area is communicated with the regulating tank, and a first partition plate is arranged between the coagulating area and the first sedimentation area; a first stirrer is arranged in the coagulation area; first settling zone lower part is equipped with first album of mud groove, first album of mud tank bottom is provided with first exhaust valve, first album of mud groove top is equipped with first perforation inlet tube, be provided with a plurality of apopores on the first perforation inlet tube, the one end of first perforation inlet tube set up in on the first baffle, with the district intercommunication that congeals makes the solution in the district that congeals can pass through first perforation inlet tube gets into first settling zone, first perforation inlet tube top is equipped with first swash plate, first swash plate top is equipped with first overflow mouth.
The coagulant delivered by the coagulant feeding pump is polymeric ferric sulfate;
the coagulant aid delivered by the coagulant aid dosing pump is anionic polyacrylamide.
In the invention, the solution in the coagulation area enters the precipitation area through a plurality of water outlet holes on the first perforated water inlet pipe.
In the invention, the pH of the anaerobic digestion solution of the sludge is 6-8, and the combination of polyferric sulfate as a coagulant and anionic polyacrylamide as a coagulant aid can reduce the pH of effluent after coagulating sedimentation treatment to below 5, thereby providing an acidic environment for Fenton catalytic oxidation treatment; simultaneously, will partly play water backward flow after the fenton catalytic oxidation handles extremely the end of intaking in the fenton catalytic oxidation pond, the characteristic that the pH of partly play water after the usable fenton catalytic oxidation handles is lower adjusts the pH of intaking in the end of intaking in the fenton catalytic oxidation pond to below 4, provides the best reaction condition for the fenton catalytic oxidation handles.
According to the invention, preferably, the neutralization sedimentation tank sequentially comprises a pH adjusting area and a second sedimentation area, the pH adjusting area is communicated with the Fenton catalytic oxidation tank, and a fourth partition plate is arranged between the pH adjusting area and the second sedimentation area; the pH adjustment zone is equipped with the third agitator, the below of second settling zone is equipped with third collection mud groove, third collection mud groove bottom is provided with the third blowoff valve, third collection mud groove top is equipped with the second and perforates the inlet tube, be provided with a plurality of apopores on the second perforates the inlet tube, the one end of the second perforates the inlet tube set up in on the fourth baffle, with pH adjustment zone intercommunication, the solution in pH adjustment zone passes through the second perforates the inlet tube and gets into the second settling zone, the second perforates the inlet tube top and is equipped with the second swash plate, second swash plate top is equipped with the second overflow mouth.
In the invention, the solution in the pH adjusting area enters the settling area through a plurality of water outlet holes on the second perforated water inlet pipe.
According to the invention, preferably, the connecting pipe for communicating the adjusting tank with the coagulating sedimentation tank, the connecting pipe for communicating the coagulating sedimentation tank with the Fenton catalytic oxidation tank, and the connecting pipe for communicating the Fenton catalytic oxidation tank with the neutralizing sedimentation tank are all polypropylene pipes or 316L stainless steel pipes.
In another aspect of the present invention, there is provided a method for treating anaerobic sludge digestion liquid, in which the system for treating anaerobic sludge digestion liquid by acidless fenton oxidation is adopted, the method comprising the steps of:
(1) introducing sludge anaerobic digestion liquid into the regulating tank to regulate the water inlet amount;
(2) conveying the sludge anaerobic digestion liquid in the regulating tank into the coagulating sedimentation device for coagulating sedimentation treatment;
(3) conveying the effluent after the coagulating sedimentation treatment into the Fenton catalytic oxidation device for Fenton catalytic oxidation treatment; part of the effluent after the Fenton catalytic oxidation treatment flows back to the water inlet end of the Fenton catalytic oxidation pool, and the rest of the effluent enters the neutralization and precipitation device;
(4) and the rest of effluent entering the neutralization and precipitation device is subjected to pH adjustment in the neutralization and precipitation tank and then is subjected to neutralization and precipitation treatment.
In the invention, the sludge anaerobic digestion solution in the regulating tank is conveyed to a coagulation area of the coagulating sedimentation tank through a water inlet pump, the coagulant polymeric ferric sulfate and the coagulant aid anionic polyacrylamide are respectively added into the coagulation area of the coagulating sedimentation tank through a coagulant adding pump and a coagulant aid adding pump, then the mechanical stirring coagulation is carried out in the coagulation area by using a first stirrer, and then the mixture enters a first sedimentation area, thereby completing the coagulating sedimentation treatment.
In the invention, the effluent of the first sedimentation tank after the coagulating sedimentation treatment is conveyed into the Fenton catalytic oxidation tank by utilizing gravity flow, and the solution in the medicament mixing areas is mechanically stirred and mixed by the second stirrer in each medicament mixing area.
In the invention, the effluent of the second settling zone is directly discharged through an overflow port arranged in the settling zone.
According to the invention, preferably:
in the step (1):
the concentration of COD in the anaerobic digestion solution of the sludge is below 4000 mg/L;
in the step (2):
the coagulation time of the coagulation sedimentation treatment is 10-15 minutes, and the sedimentation time is 1-2 hours;
the coagulant used in the coagulating sedimentation treatment is polyferric sulfate;
the coagulant aid used in the coagulating sedimentation treatment is anionic polyacrylamide.
In the step (3):
the ratio of the concentration of hydrogen peroxide added into the first medicament mixing area to the concentration of COD in the sludge anaerobic digestion liquid added into the regulating tank is 0.8-2.5: 1;
the molar concentration ratio of the hydrogen peroxide to the ferrous sulfate aqueous solution added into the first medicament mixing zone is 40-30: 1;
the dosing amount of the ferrous sulfate aqueous solution added into the other medicament mixing zone is the same as the dosing amount of the ferrous sulfate aqueous solution added into the first medicament mixing zone;
the retention time of the effluent after the coagulating sedimentation treatment in each medicament mixing area is 2-10 minutes, and the retention time in each reaction area is 25-30 minutes;
the ratio of the water amount flowing back to the water inlet end of the Fenton catalytic oxidation tank to the water amount of the rest of the effluent entering the neutralization and precipitation device is 1: 1-5;
the catalyst used in the Fenton catalytic oxidation treatment is an iron oxide catalyst, and the addition amount of the catalyst accounts for 5/8-7/8 of the volume of the reaction zone.
In the step (4):
the pH value in the neutralization sedimentation tank is controlled to be 7.0-8.0, and the sedimentation time of the neutralization sedimentation treatment is 1-2 hours.
In the present invention, the dosage of the ferrous sulfate aqueous solution added to the other reagent mixing zone is the same as the dosage of the ferrous sulfate aqueous solution added to the first reagent mixing zone, where the same means that the molar concentrations and the addition amounts of the ferrous sulfate aqueous solution in the other reagent mixing zone and the ferrous sulfate aqueous solution in the first reagent mixing zone are the same.
In the invention, the use of the catalyst can accelerate the Fenton catalytic oxidation reaction and promote the degradation of organic matters. The ferrous sulfate aqueous solution is added into each reaction zone in batches, so that the utilization efficiency of free radicals is improved.
The technical scheme of the invention has the following advantages:
(1) compared with the traditional Fenton process, the method has the advantages that the iron ions in the polymeric ferric sulfate added into the coagulating sedimentation tank are hydrolyzed to generate hydrogen ions, the pH value of the effluent of the coagulating sedimentation tank can be reduced to be below 5, the requirement of the subsequent Fenton reaction is met, the acidification-free treatment is realized, the effluent of the coagulating sedimentation tank contains a small amount of iron ions, the subsequent Fenton reaction is facilitated, the adding amount of a Fenton reaction medicament can be reduced, and the operation cost is reduced.
(2) Compared with the traditional Fenton process in which a hydrogen peroxide and ferrous sulfate reagent is added into a reactor at one time, the Fenton process has the advantages that ferrous sulfate is added at different points, and the Fenton process has the effects that hydroxyl radicals generated by the Fenton reaction are excessive compared with organic matters, so that the hydroxyl radicals participate in side reactions too much, the oxidation efficiency is reduced, and when the Fenton process is added at multiple points, the hydroxyl radicals generated by the Fenton reaction are insufficient compared with the organic matters, so that the utilization efficiency of the hydroxyl radicals is improved, and the removal rate of the organic matters is improved.
(3) The system for treating the anaerobic digestion liquid of the sludge by the acidless Fenton oxidation has the advantages of reasonable design, convenience in operation and use, low maintenance cost, stability in operation and the like.
Additional features and advantages of the invention will be set forth in the detailed description which follows.
Drawings
The above and other objects, features and advantages of the present invention will become more apparent by describing in more detail exemplary embodiments thereof with reference to the attached drawings, in which like reference numerals generally represent like parts throughout.
FIG. 1 shows a schematic diagram of an apparatus for treating anaerobic sludge digestion liquid by acidless Fenton oxidation according to the present invention.
Wherein, 1-a regulating tank, 2-a coagulating sedimentation tank, 21-a water inlet pump, 22-a coagulant dosing pump, 23-a coagulant aid dosing pump, 24-a coagulating zone, 25-a first sedimentation zone, 26-a first clapboard, 27-a first stirrer, 28-a first sludge collecting tank, 29-a first emptying valve, 210-a first perforated water inlet pipe, 211-a first inclined plate, 212-a first overflow port, 3-a Fenton catalytic oxidation tank, 31-a medicament mixing zone, 32-a reaction zone, 33-a catalyst, 34-a catalyst supporting layer, 35-a second sludge collecting tank, 36-a tail water reflux pipe, 37-a ferrous sulfate dosing pipe, 38-a hydrogen peroxide dosing pipe, 39-a dosing pump, 310-a ferrous sulfate dosing pump, 311-a tail water reflux pump, 312-a second clapboard, 313-a first opening, 314-a third clapboard, 315-a second opening, 316-a second emptying valve, 317-a second stirrer, 4-a neutralization sedimentation tank, 41-an alkali adding pump, 42-a pH control unit, 43-a pH adjusting area, 44-a second sedimentation area, 45-a fourth clapboard, 46-a third stirrer, 47-a third sludge collecting tank, 48-a third emptying valve, 49-a second perforated water inlet pipe, 410-a second inclined plate and 411-a second overflow port.
FIG. 2 shows a schematic diagram of a Fenton catalytic oxidation pond in an apparatus for treating anaerobic sludge digestion liquid by acidless Fenton oxidation according to the present invention.
The device comprises a 3-Fenton catalytic oxidation tank, a 31-medicament mixing zone, a 32-reaction zone, a 33-catalyst, a 34-catalyst supporting layer, a 35-second sludge collecting tank, a 36-tail water return pipe, a 37-ferrous sulfate dosing pipe, a 38-hydrogen peroxide dosing pipe, a 39-hydrogen peroxide dosing pump, a 310-ferrous sulfate dosing pump, a 311-tail water return pump, a 312-second partition plate, a 313-first opening, a 314-third partition plate, a 315-second opening, a 316-second emptying valve and a 317-second stirrer.
Detailed Description
Preferred embodiments of the present invention will be described in more detail below. While the following describes preferred embodiments of the present invention, it should be understood that the present invention may be embodied in various forms and should not be limited by the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the invention to those skilled in the art.
Example 1:
sludge in a certain sludge treatment center of Beijing is subjected to anaerobic digestion after a thermal hydrolysis process, and the sludge subjected to anaerobic digestion is compressed by a plate frame to generate sludge anaerobic digestion liquid, wherein COD is 2000mg/L, pH is 8.0, ammonia nitrogen concentration is 1500mg/L, and BOD5200mg/L, low B/C and poor biodegradability. The sludge anaerobic digestion solution is treated by the system for treating the sludge anaerobic digestion solution by acidation-free Fenton oxidation in the embodiment.
As shown in fig. 1 and 2, the present embodiment provides a system for treating anaerobic digestion liquid of sludge by acidless fenton oxidation, which comprises: equalizing basin 1, coagulating sedimentation device, fenton catalytic oxidation device and neutralization sedimentation device, wherein:
the coagulating sedimentation device comprises: a coagulating sedimentation tank 2, a coagulant dosing pump 22 and a coagulant aid dosing pump 23; the coagulating sedimentation tank 2 is communicated with the regulating tank 1, and the front end of the coagulating sedimentation tank 2 is provided with the coagulant adding pump 22 and the coagulant aid adding pump 23; the coagulating sedimentation tank 2 is a lateral flow sedimentation tank. The coagulating sedimentation tank 2 sequentially comprises a coagulating zone 24 and a first sedimentation zone 25, the coagulating zone 24 is communicated with the regulating tank 1, and a first partition plate 26 is arranged between the coagulating zone 24 and the first sedimentation zone 25; a first stirrer 27 is arranged in the coagulation zone 24; the lower portion of the first settling zone 25 is provided with a first sludge collecting groove 28, the bottom of the first sludge collecting groove 28 is provided with a first emptying valve 29, a first perforated water inlet pipe 210 is arranged above the first sludge collecting groove 28, the first perforated water inlet pipe 210 is provided with a plurality of water outlet holes, one end of the first perforated water inlet pipe 210 is arranged on the first partition plate 26 and communicated with the coagulation zone 24, so that the solution in the coagulation zone 24 can enter the first settling zone 25 through the plurality of water outlet holes in the first perforated water inlet pipe 210. A first inclined plate 211 is arranged above the first perforated water inlet pipe 210, and a first overflow port 212 is arranged above the first inclined plate 211. The coagulant delivered by the coagulant dosing pump 22 is polymeric ferric sulfate; the coagulant aid delivered by the coagulant aid dosing pump 23 is anionic polyacrylamide.
The Fenton catalytic oxidation device comprises: a Fenton catalytic oxidation tank 3 and a dosing unit; the Fenton catalytic oxidation tank 3 is communicated with the coagulating sedimentation tank 2, a tail water return pipe 36 is arranged at the water outlet end of the Fenton catalytic oxidation tank 3, the tail water return pipe 36 is communicated with the water inlet end of the Fenton catalytic oxidation tank 3 through a tail water return pump 311, and the medicine adding unit is used for adding a medicine into the Fenton catalytic oxidation tank 3; medicament mixing areas 31 and reaction areas 32 are alternately arranged in the Fenton catalytic oxidation tank 3 in sequence, and the number of the medicament mixing areas 31 and the number of the reaction areas 32 are four; each reaction area 32 is separated from the medicament mixing area 31 arranged at the front part of the reaction area by a second partition plate 312, the upper part of the second partition plate 312 is provided with a first opening 313, each reaction area 32 is separated from the medicament mixing area 31 arranged at the rear part of the reaction area by a third partition plate 314, and the lower part of the third partition plate 314 is provided with a second opening 315;
the medicaments added in the first medicament mixing zone 31 of the four medicament mixing zones 31 are hydrogen peroxide and ferrous sulfate aqueous solution, and the medicaments added in the other medicament mixing zones 31 are only ferrous sulfate aqueous solution; a second stirrer 317 is arranged in each medicament mixing area 31; the first reagent mixing area 31 is communicated with the first sedimentation area 25 of the coagulating sedimentation tank 2;
the lower parts of the four reaction zones 32 are respectively provided with a second sludge collecting groove 35, the bottom of the second sludge collecting groove 35 is provided with a second emptying valve 316, a catalyst supporting layer 34 is arranged above the second sludge collecting groove 35, and the catalyst supporting layer 34 is provided with a catalyst 33;
the medicine adding units comprise four medicine adding units, and the four medicine adding units are used for adding medicines to the four medicine mixing areas 31; the first dosing units of the four dosing units are used for adding hydrogen peroxide and ferrous sulfate aqueous solutions into the first medicament mixing area 31, and the other dosing units are respectively used for adding ferrous sulfate aqueous solutions into the other medicament mixing areas 31. The first dosing unit comprises a ferrous sulfate dosing pipe 37, a hydrogen peroxide dosing pipe 38, a hydrogen peroxide dosing pump 39 and a ferrous sulfate dosing pump 310; the hydrogen peroxide dosing pump 39 is connected with the hydrogen peroxide dosing pipe 38 and is used for conveying hydrogen peroxide to the hydrogen peroxide dosing pipe 38; the ferrous sulfate dosing pump 310 is connected with the ferrous sulfate dosing pipe 37 and is used for conveying a ferrous sulfate aqueous solution to the ferrous sulfate dosing pipe 37; the ferrous sulfate dosing pipe 37 and the hydrogen peroxide dosing pipe 38 of the first dosing unit are both communicated with the first medicament mixing area 31; the other dosing units comprise ferrous sulfate dosing pipes 37 and ferrous sulfate dosing pumps 310; the ferrous sulfate dosing pump 310 is connected with the ferrous sulfate dosing pipe 37 and is used for conveying a ferrous sulfate aqueous solution to the ferrous sulfate dosing pipe 37; and ferrous sulfate dosing pipes 37 of the other dosing units are respectively communicated with the other medicament mixing area 31.
The neutralization and precipitation device comprises: an alkali adding pump 41, a pH control unit 42 and a neutralization sedimentation tank 4; the neutralization sedimentation tank 4 is communicated with the Fenton catalytic oxidation tank 3, an alkali adding pump 41 is arranged at the front end of the neutralization sedimentation tank 4, and the alkali adding pump 41 is electrically connected with the pH control unit 42. The neutralization and sedimentation tank 4 sequentially comprises a pH adjusting area 43 and a second sedimentation area 44, the pH adjusting area 43 is communicated with the last reaction area 32 of the Fenton catalytic oxidation tank 3, and a fourth partition plate 45 is arranged between the pH adjusting area 43 and the second sedimentation area 44; the pH adjusting area 43 is provided with a third stirrer 46, a third sludge collecting groove 47 is arranged below the second settling area 44, a third emptying valve 48 is arranged at the bottom of the third sludge collecting groove 47, a second perforated water inlet pipe 49 is arranged above the third sludge collecting groove 47, a plurality of water outlet holes are formed in the second perforated water inlet pipe 49, one end of the second perforated water inlet pipe 49 is arranged on the fourth partition plate 45 and communicated with the pH adjusting area 43, the solution of the pH adjusting area 43 passes through the plurality of water outlet holes in the second perforated water inlet pipe 49 to enter the second settling area 44, a second inclined plate 410 is arranged above the second perforated water inlet pipe 49, and a second overflow port 411 is arranged above the second inclined plate 410.
The equalizing basin 1 with the connecting pipe of coagulating sedimentation tank 2 intercommunication, the connecting pipe of coagulating sedimentation tank 2 and the 3 intercommunications of fenton catalytic oxidation pond, and the connecting pipe of the 3 and the 4 intercommunications of neutralization sedimentation tanks of fenton catalytic oxidation pond is the polypropylene pipe.
The method for treating the sludge anaerobic digestion solution comprises the following steps:
(1) introducing sludge anaerobic digestion liquid into the regulating tank 1 to regulate the water inlet amount;
(2) conveying the sludge anaerobic digestion liquid in the adjusting tank 1 into the coagulating sedimentation device through a water inlet pump 21 for coagulating sedimentation treatment;
the coagulation time of the coagulating sedimentation treatment is 15 minutes, the sedimentation time is 45 minutes, the coagulant used in the coagulating sedimentation treatment is polymeric ferric sulfate, and the coagulant aid used in the coagulating sedimentation treatment is anionic polyacrylamide.
(3) Conveying the effluent subjected to the coagulating sedimentation treatment into the Fenton catalytic oxidation device by utilizing gravity flow to perform Fenton catalytic oxidation treatment; part of the effluent after the Fenton catalytic oxidation treatment flows back to the water inlet end of the Fenton catalytic oxidation tank 3, and the rest of the effluent enters the neutralization and precipitation device;
the ratio of the concentration of hydrogen peroxide added to the first agent mixing area 31 to the concentration of COD in the anaerobic digestion solution of sludge added to the regulating tank 1 is 2: 1; the molar concentration ratio of the hydrogen peroxide to the ferrous sulfate aqueous solution added to the first agent mixing zone 31 is 40: 1; the dosage of the ferrous sulfate aqueous solution added into the other agent mixing zone 31 is the same as the molar concentration and the addition amount of the ferrous sulfate aqueous solution added into the first agent mixing zone 31; the retention time of the effluent after the coagulating sedimentation treatment in each medicament mixing zone 31 is 5 minutes, and the retention time in each reaction zone 32 is 25 minutes; the ratio of the water amount flowing back to the water inlet end of the Fenton catalytic oxidation tank 3 to the water amount of the rest of the effluent entering the neutralization and precipitation device is 1: 3; the catalyst used in the Fenton catalytic oxidation treatment is an iron oxide catalyst, and the addition amount of the catalyst accounts for 3/4 of the volume of the reaction zone.
(4) And the rest of effluent entering the neutralization and precipitation device is subjected to pH adjustment in the neutralization and precipitation tank 4 and then is subjected to neutralization and precipitation treatment.
The pH value in the neutralization sedimentation tank 4 is controlled to be 7.0-8.0, the sedimentation time of neutralization sedimentation treatment is 1 hour, the concentration of COD in the effluent of the second sedimentation zone 44 is reduced to 442mg/L, the effluent can return to a water plant for water inlet, and the effluent of the water plant cannot exceed the standard.
Example 2:
after anaerobic digestion and plate-frame dehydration of excess sludge of a certain sewage treatment plant, anaerobic digestion liquid is generated, and after anaerobic ammonia oxidation denitrification treatment, COD is 1000mg/L, pH is 8.0, ammonia nitrogen concentration is 80mg/L, BOD5100mg/L, low B/C and poor biodegradability. The sludge anaerobic digestion solution is treated by the system for treating the sludge anaerobic digestion solution by acidation-free Fenton oxidation in the embodiment.
As shown in fig. 1 and 2, the present embodiment provides a system for treating anaerobic digestion liquid of sludge by acidless fenton oxidation, which comprises: equalizing basin 1, coagulating sedimentation device, fenton catalytic oxidation device and neutralization sedimentation device, wherein:
the coagulating sedimentation device comprises: a coagulating sedimentation tank 2, a coagulant dosing pump 22 and a coagulant aid dosing pump 23; the coagulating sedimentation tank 2 is communicated with the regulating tank 1, and the front end of the coagulating sedimentation tank 2 is provided with the coagulant adding pump 22 and the coagulant aid adding pump 23; the coagulating sedimentation tank 2 is a lateral flow sedimentation tank. The coagulating sedimentation tank 2 sequentially comprises a coagulating zone 24 and a first sedimentation zone 25, the coagulating zone 24 is communicated with the regulating tank 1, and a first partition plate 26 is arranged between the coagulating zone 24 and the first sedimentation zone 25; a first stirrer 27 is arranged in the coagulation zone 24; the lower portion of the first settling zone 25 is provided with a first sludge collecting groove 28, the bottom of the first sludge collecting groove 28 is provided with a first emptying valve 29, a first perforated water inlet pipe 210 is arranged above the first sludge collecting groove 28, the first perforated water inlet pipe 210 is provided with a plurality of water outlet holes, one end of the first perforated water inlet pipe 210 is arranged on the first partition plate 26 and communicated with the coagulation zone 24, so that the solution in the coagulation zone 24 can enter the first settling zone 25 through the plurality of water outlet holes in the first perforated water inlet pipe 210. A first inclined plate 211 is arranged above the first perforated water inlet pipe 210, and a first overflow port 212 is arranged above the first inclined plate 211. The coagulant delivered by the coagulant dosing pump 22 is polymeric ferric sulfate; the coagulant aid delivered by the coagulant aid dosing pump 23 is anionic polyacrylamide.
The Fenton catalytic oxidation device comprises: a Fenton catalytic oxidation tank 3 and a dosing unit; the Fenton catalytic oxidation tank 3 is communicated with the coagulating sedimentation tank 2, a tail water return pipe 36 is arranged at the water outlet end of the Fenton catalytic oxidation tank 3, the tail water return pipe 36 is communicated with the water inlet end of the Fenton catalytic oxidation tank 3 through a tail water return pump 311, and the medicine adding unit is used for adding a medicine into the Fenton catalytic oxidation tank 3; medicament mixing areas 31 and reaction areas 32 are alternately arranged in the Fenton catalytic oxidation tank 3 in sequence, and the number of the medicament mixing areas 31 and the number of the reaction areas 32 are four; each reaction area 32 is separated from the medicament mixing area 31 arranged at the front part of the reaction area by a second partition plate 312, the upper part of the second partition plate 312 is provided with a first opening 313, each reaction area 32 is separated from the medicament mixing area 31 arranged at the rear part of the reaction area by a third partition plate 314, and the lower part of the third partition plate 314 is provided with a second opening 315;
the medicaments added in the first medicament mixing zone 31 of the four medicament mixing zones 31 are hydrogen peroxide and ferrous sulfate aqueous solution, and the medicaments added in the other medicament mixing zones 31 are only ferrous sulfate aqueous solution; a second stirrer 317 is arranged in each medicament mixing area 31; the first reagent mixing area 31 is communicated with the first sedimentation area 25 of the coagulating sedimentation tank 2;
the lower parts of the four reaction zones 32 are respectively provided with a second sludge collecting groove 35, the bottom of the second sludge collecting groove 35 is provided with a second emptying valve 316, a catalyst supporting layer 34 is arranged above the second sludge collecting groove 35, and the catalyst supporting layer 34 is provided with a catalyst 33;
the medicine adding units comprise four medicine adding units, and the four medicine adding units are used for adding medicines to the four medicine mixing areas 31; the first dosing units of the four dosing units are used for adding hydrogen peroxide and ferrous sulfate aqueous solutions into the first medicament mixing area 31, and the other dosing units are respectively used for adding ferrous sulfate aqueous solutions into the other medicament mixing areas 31. The first dosing unit comprises a ferrous sulfate dosing pipe 37, a hydrogen peroxide dosing pipe 38, a hydrogen peroxide dosing pump 39 and a ferrous sulfate dosing pump 310; the hydrogen peroxide dosing pump 39 is connected with the hydrogen peroxide dosing pipe 38 and is used for conveying hydrogen peroxide to the hydrogen peroxide dosing pipe 38; the ferrous sulfate dosing pump 310 is connected with the ferrous sulfate dosing pipe 37 and is used for conveying a ferrous sulfate aqueous solution to the ferrous sulfate dosing pipe 37; the ferrous sulfate dosing pipe 37 and the hydrogen peroxide dosing pipe 38 of the first dosing unit are both communicated with the first medicament mixing area 31; the other dosing units comprise ferrous sulfate dosing pipes 37 and ferrous sulfate dosing pumps 310; the ferrous sulfate dosing pump 310 is connected with the ferrous sulfate dosing pipe 37 and is used for conveying a ferrous sulfate aqueous solution to the ferrous sulfate dosing pipe 37; and ferrous sulfate dosing pipes 37 of the other dosing units are respectively communicated with the other medicament mixing area 31.
The neutralization and precipitation device comprises: an alkali adding pump 41, a pH control unit 42 and a neutralization sedimentation tank 4; the neutralization sedimentation tank 4 is communicated with the Fenton catalytic oxidation tank 3, an alkali adding pump 41 is arranged at the front end of the neutralization sedimentation tank 4, and the alkali adding pump 41 is in communication connection with the pH control unit 42. The neutralization and sedimentation tank 4 sequentially comprises a pH adjusting area 43 and a second sedimentation area 44, the pH adjusting area 43 is communicated with the last reaction area 32 of the Fenton catalytic oxidation tank 3, and a fourth partition plate 45 is arranged between the pH adjusting area 43 and the second sedimentation area 44; the pH adjusting area 43 is provided with a third stirrer 46, a third sludge collecting groove 47 is arranged below the second settling area 44, a third emptying valve 48 is arranged at the bottom of the third sludge collecting groove 47, a second perforated water inlet pipe 49 is arranged above the third sludge collecting groove 47, a plurality of water outlet holes are formed in the second perforated water inlet pipe 49, one end of the second perforated water inlet pipe 49 is arranged on the fourth partition plate 45 and communicated with the pH adjusting area 43, the solution of the pH adjusting area 43 passes through the plurality of water outlet holes in the second perforated water inlet pipe 49 to enter the second settling area 44, a second inclined plate 410 is arranged above the second perforated water inlet pipe 49, and a second overflow port 411 is arranged above the second inclined plate 410.
The equalizing basin 1 with the connecting pipe of coagulating sedimentation tank 2 intercommunication, the connecting pipe of coagulating sedimentation tank 2 and the 3 intercommunications of fenton catalytic oxidation pond, and the connecting pipe of the 3 and the 4 intercommunications of neutralization sedimentation tanks of fenton catalytic oxidation pond is the polypropylene pipe.
The method for treating the sludge anaerobic digestion solution comprises the following steps:
(1) introducing sludge anaerobic digestion liquid into the regulating tank 1 to regulate the water inlet amount;
(2) conveying the sludge anaerobic digestion liquid in the adjusting tank 1 into the coagulating sedimentation device through a water inlet pump 21 for coagulating sedimentation treatment;
the coagulation time of the coagulating sedimentation treatment is 15 minutes, the sedimentation time is 45 minutes, the coagulant used in the coagulating sedimentation treatment is polymeric ferric sulfate, and the coagulant aid used in the coagulating sedimentation treatment is anionic polyacrylamide.
(3) Conveying the effluent subjected to the coagulating sedimentation treatment into the Fenton catalytic oxidation device by utilizing gravity flow to perform Fenton catalytic oxidation treatment; part of the effluent after the Fenton catalytic oxidation treatment flows back to the water inlet end of the Fenton catalytic oxidation tank 3, and the rest of the effluent enters the neutralization and precipitation device;
the ratio of the concentration of hydrogen peroxide added to the first agent mixing area 31 to the concentration of COD in the anaerobic digestion solution of sludge added to the regulating tank 1 is 2.5: 1; the molar concentration ratio of the hydrogen peroxide to the ferrous sulfate aqueous solution added to the first agent mixing zone 31 is 40: 1; the dosage of the ferrous sulfate aqueous solution added into the other agent mixing zone 31 is the same as the molar concentration and the addition amount of the ferrous sulfate aqueous solution added into the first agent mixing zone 31; the retention time of the effluent after the coagulating sedimentation treatment in each medicament mixing zone 31 is 5 minutes, and the retention time in each reaction zone 32 is 25 minutes; the ratio of the water amount flowing back to the water inlet end of the Fenton catalytic oxidation tank 3 to the water amount of the rest of the effluent entering the neutralization and precipitation device is 1: 3; the catalyst used in the Fenton catalytic oxidation treatment is an iron oxide catalyst, and the addition amount of the catalyst accounts for 3/4 of the volume of the reaction zone.
(4) And the rest of effluent entering the neutralization and precipitation device is subjected to pH adjustment in the neutralization and precipitation tank 4 and then is subjected to neutralization and precipitation treatment.
The pH value in the neutralization sedimentation tank 4 is controlled to be 7.0-8.0, the sedimentation time of neutralization sedimentation treatment is 1 hour, the concentration of COD in the effluent of the second sedimentation zone 44 is reduced to 260mg/L, and the effluent can be directly discharged to a municipal sewage pipeline.
The two embodiments show that the sludge anaerobic digestion liquid acidification-free Fenton catalytic oxidation treatment system can effectively remove COD in the sludge anaerobic digestion liquid, ensure that the concentration of the COD in the effluent can reach the expected effect, and can meet the actual operation requirement.
Having described embodiments of the present invention, the foregoing description is intended to be exemplary, not exhaustive, and not limited to the embodiments disclosed. Many modifications and variations will be apparent to those of ordinary skill in the art without departing from the scope and spirit of the described embodiments.
Claims (10)
1. A system for treating sludge anaerobic digestion liquid by acidless Fenton oxidation is characterized by comprising the following components in sequence: equalizing basin, coagulating sedimentation device, fenton catalytic oxidation device and neutralization sedimentation device, wherein:
the coagulating sedimentation device comprises: a coagulating sedimentation tank, a coagulant dosing pump and a coagulant aid dosing pump; the coagulating sedimentation tank is communicated with the regulating tank, and the front end of the coagulating sedimentation tank is provided with the coagulant dosing pump and the coagulant aid dosing pump;
the Fenton catalytic oxidation device comprises: a Fenton catalytic oxidation tank and a dosing unit; the Fenton catalytic oxidation tank is communicated with the coagulating sedimentation tank, a tail water return pipe is arranged at the water outlet end of the Fenton catalytic oxidation tank and is communicated with the water inlet end of the Fenton catalytic oxidation tank through a tail water return pump, and the dosing unit is used for dosing a medicament into the Fenton catalytic oxidation tank;
the neutralization and precipitation device comprises: an alkali pump, a pH control unit and a neutralization sedimentation tank; the neutralization sedimentation tank is communicated with the Fenton catalytic oxidation tank, an alkali adding pump is arranged at the front end of the neutralization sedimentation tank, and the alkali adding pump is connected with the pH control unit.
2. The system for treating sludge anaerobic digestion liquid by acidless Fenton oxidation according to claim 1, wherein a plurality of reagent mixing areas and a plurality of reaction areas are alternately arranged in the Fenton catalytic oxidation pond in sequence; each reaction area and the medicament mixing area arranged at the front part of the reaction area are separated by a second partition plate, the upper part of the second partition plate is provided with a first opening, each reaction area and the medicament mixing area arranged at the rear part of the reaction area are separated by a third partition plate, and the lower part of the third partition plate is provided with a second opening;
the medicaments added in the first medicament mixing zone of the plurality of medicament mixing zones are hydrogen peroxide and ferrous sulfate aqueous solution, and the medicaments added in other medicament mixing zones are only ferrous sulfate aqueous solution; a second stirrer is arranged in each medicament mixing area; the first reagent mixing area is communicated with the coagulating sedimentation tank;
the lower parts of the plurality of reaction zones are respectively provided with a second sludge collecting groove, the bottom of each second sludge collecting groove is provided with a second emptying valve, a catalyst bearing layer is arranged above each second sludge collecting groove, and catalysts are placed on the catalyst bearing layers;
the medicine adding units comprise a plurality of medicine adding units, and the medicine adding units are used for adding medicines to the medicine mixing areas; and the first dosing units of the dosing units are used for adding hydrogen peroxide and ferrous sulfate aqueous solutions into the first medicament mixing area, and the other dosing units are respectively used for adding ferrous sulfate aqueous solutions into the other medicament mixing areas.
3. The system for acidless Fenton's oxidation treatment of sludge anaerobic digestion liquid according to claim 2, wherein,
the first dosing unit comprises a ferrous sulfate dosing pipe, a hydrogen peroxide dosing pump and a ferrous sulfate dosing pump; the hydrogen peroxide dosing pump is connected with the hydrogen peroxide dosing pipe and used for conveying hydrogen peroxide to the hydrogen peroxide dosing pipe; the ferrous sulfate dosing pump is connected with the ferrous sulfate dosing pipe and is used for conveying a ferrous sulfate aqueous solution to the ferrous sulfate dosing pipe; the ferrous sulfate dosing pipe and the hydrogen peroxide dosing pipe of the first dosing unit are both communicated with the first medicament mixing area;
the other dosing units comprise ferrous sulfate dosing pipes and ferrous sulfate dosing pumps; the ferrous sulfate dosing pump is connected with the ferrous sulfate dosing pipe and is used for conveying a ferrous sulfate aqueous solution to the ferrous sulfate dosing pipe; and ferrous sulfate dosing pipes of the other dosing units are respectively communicated with the other medicament mixing areas.
4. The system for treating sludge anaerobic digestion liquid by acidless Fenton oxidation according to claim 2, wherein the number of said chemical agent mixing zone, said reaction zone and said dosing unit is four.
5. The system for acidification-free Fenton's oxidation treatment of sludge anaerobic digester according to claim 1, wherein the coagulation sedimentation tank is a counter current sedimentation tank or a side current sedimentation tank.
6. The system for treating sludge anaerobic digestion liquid by acidless Fenton's oxidation according to any one of claims 1 to 5, wherein,
the coagulating sedimentation tank sequentially comprises a coagulating area and a first sedimentation area, the coagulating area is communicated with the regulating tank, and a first partition plate is arranged between the coagulating area and the first sedimentation area; a first stirrer is arranged in the coagulation area; first settling zone lower part is equipped with first album of mud groove, first album of mud tank bottom is provided with first exhaust valve, first album of mud groove top is equipped with first perforation inlet tube, be provided with a plurality of apopores on the first perforation inlet tube, the one end of first perforation inlet tube set up in on the first baffle, with the district intercommunication that congeals makes the solution in the district that congeals can pass through first perforation inlet tube gets into first settling zone, first perforation inlet tube top is equipped with first swash plate, first swash plate top is equipped with first overflow mouth.
The coagulant delivered by the coagulant feeding pump is polymeric ferric sulfate;
the coagulant aid delivered by the coagulant aid dosing pump is anionic polyacrylamide.
7. The system for treating sludge anaerobic digestion liquid by acidless Fenton oxidation according to claim 1, wherein the neutralization sedimentation tank comprises a pH adjusting area and a second sedimentation area in sequence, the pH adjusting area is communicated with the Fenton catalytic oxidation tank, and a fourth partition plate is arranged between the pH adjusting area and the second sedimentation area; the pH adjustment zone is equipped with the third agitator, the below of second settling zone is equipped with third collection mud groove, third collection mud groove bottom is provided with the third blowoff valve, third collection mud groove top is equipped with the second and perforates the inlet tube, be provided with a plurality of apopores on the second perforates the inlet tube, the one end of the second perforates the inlet tube set up in on the fourth baffle, with pH adjustment zone intercommunication, the solution in pH adjustment zone passes through the second perforates the inlet tube and gets into the second settling zone, the second perforates the inlet tube top and is equipped with the second swash plate, second swash plate top is equipped with the second overflow mouth.
8. The system for treating sludge anaerobic digestion liquid by acidless Fenton oxidation according to claim 1, wherein the connecting pipe of the adjusting tank communicated with the coagulating sedimentation tank, the connecting pipe of the coagulating sedimentation tank communicated with the Fenton catalytic oxidation tank and the connecting pipe of the Fenton catalytic oxidation tank communicated with the neutralizing sedimentation tank are all polypropylene pipes or 316L stainless steel pipes.
9. A method for treating anaerobic sludge digestion liquid, which is characterized in that the system for treating anaerobic sludge digestion liquid by acidation-free fenton oxidation according to any one of claims 1 to 8 is adopted, and the method comprises the following steps:
(1) introducing sludge anaerobic digestion liquid into the regulating tank to regulate the water inlet amount;
(2) conveying the sludge anaerobic digestion liquid in the regulating tank into the coagulating sedimentation device for coagulating sedimentation treatment;
(3) conveying the effluent after the coagulating sedimentation treatment into the Fenton catalytic oxidation device for Fenton catalytic oxidation treatment; part of the effluent after the Fenton catalytic oxidation treatment flows back to the water inlet end of the Fenton catalytic oxidation pool, and the rest of the effluent enters the neutralization and precipitation device;
(4) and the rest of effluent entering the neutralization and precipitation device is subjected to pH adjustment in the neutralization and precipitation tank and then is subjected to neutralization and precipitation treatment.
10. The method for treating sludge anaerobic digestion liquid according to claim 9, wherein:
in the step (1):
the concentration of COD in the anaerobic digestion solution of the sludge is below 4000 mg/L;
in the step (2):
the coagulation time of the coagulation sedimentation treatment is 10-15 minutes, and the sedimentation time is 1-2 hours;
the coagulant used in the coagulating sedimentation treatment is polyferric sulfate;
the coagulant aid used in the coagulating sedimentation treatment is anionic polyacrylamide;
in the step (3):
the ratio of the concentration of hydrogen peroxide added into the first medicament mixing area to the concentration of COD in the sludge anaerobic digestion liquid added into the regulating tank is 0.8-2.5: 1;
the molar concentration ratio of the hydrogen peroxide to the ferrous sulfate aqueous solution added into the first medicament mixing zone is 40-30: 1;
the dosing amount of the ferrous sulfate aqueous solution added into the other medicament mixing zone is the same as the dosing amount of the ferrous sulfate aqueous solution added into the first medicament mixing zone;
the retention time of the effluent after the coagulating sedimentation treatment in each medicament mixing area is 2-10 minutes, and the retention time in each reaction area is 25-30 minutes;
the ratio of the water amount flowing back to the water inlet end of the Fenton catalytic oxidation tank to the water amount of the rest of the effluent entering the neutralization and precipitation device is 1: 1-5;
the catalyst used in the Fenton catalytic oxidation treatment is an iron oxide catalyst, and the addition amount of the catalyst accounts for 5/8-7/8 of the volume of the reaction zone.
In the step (4):
the pH value in the neutralization sedimentation tank is controlled to be 7.0-8.0, and the sedimentation time of the neutralization sedimentation treatment is 1-2 hours.
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| CN115417486A (en) * | 2022-07-28 | 2022-12-02 | 北京城市排水集团有限责任公司 | Device and method for treating sewage through push-flow type multipoint adding Fenton oxidation |
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| CN115417486B (en) * | 2022-07-28 | 2023-11-03 | 北京城市排水集团有限责任公司 | Device and method for treating sewage by push-flow type multipoint Fenton oxidation |
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| CN112028320B (en) | 2024-02-02 |
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