CN115159792A - System and method for obtaining carbon source by utilizing high-temperature enhanced sludge hydrolysis - Google Patents
System and method for obtaining carbon source by utilizing high-temperature enhanced sludge hydrolysis Download PDFInfo
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- CN115159792A CN115159792A CN202210756026.3A CN202210756026A CN115159792A CN 115159792 A CN115159792 A CN 115159792A CN 202210756026 A CN202210756026 A CN 202210756026A CN 115159792 A CN115159792 A CN 115159792A
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- 239000010802 sludge Substances 0.000 title claims abstract description 185
- 230000007062 hydrolysis Effects 0.000 title claims abstract description 62
- 238000006460 hydrolysis reaction Methods 0.000 title claims abstract description 62
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 title claims abstract description 36
- 229910052799 carbon Inorganic materials 0.000 title claims abstract description 36
- 238000000034 method Methods 0.000 title claims abstract description 19
- 239000000126 substance Substances 0.000 claims abstract description 35
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 claims abstract description 34
- 238000004062 sedimentation Methods 0.000 claims abstract description 25
- OAICVXFJPJFONN-UHFFFAOYSA-N Phosphorus Chemical compound [P] OAICVXFJPJFONN-UHFFFAOYSA-N 0.000 claims abstract description 18
- 229910052698 phosphorus Inorganic materials 0.000 claims abstract description 18
- 239000011574 phosphorus Substances 0.000 claims abstract description 18
- 238000005336 cracking Methods 0.000 claims abstract description 17
- 229910052757 nitrogen Inorganic materials 0.000 claims abstract description 17
- 229910019142 PO4 Inorganic materials 0.000 claims abstract description 10
- 239000010452 phosphate Substances 0.000 claims abstract description 10
- 159000000003 magnesium salts Chemical class 0.000 claims abstract description 9
- NBIIXXVUZAFLBC-UHFFFAOYSA-K phosphate Chemical compound [O-]P([O-])([O-])=O NBIIXXVUZAFLBC-UHFFFAOYSA-K 0.000 claims abstract description 9
- 238000003756 stirring Methods 0.000 claims abstract description 9
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 9
- 238000010438 heat treatment Methods 0.000 claims abstract description 7
- HEMHJVSKTPXQMS-UHFFFAOYSA-M Sodium hydroxide Chemical compound [OH-].[Na+] HEMHJVSKTPXQMS-UHFFFAOYSA-M 0.000 claims description 15
- 230000001105 regulatory effect Effects 0.000 claims description 9
- 230000001276 controlling effect Effects 0.000 claims description 8
- 239000007788 liquid Substances 0.000 claims description 8
- 238000006243 chemical reaction Methods 0.000 claims description 7
- 239000011259 mixed solution Substances 0.000 claims description 7
- 239000007787 solid Substances 0.000 claims description 7
- 239000006228 supernatant Substances 0.000 claims description 7
- 230000015556 catabolic process Effects 0.000 claims description 6
- 238000006731 degradation reaction Methods 0.000 claims description 6
- 238000010907 mechanical stirring Methods 0.000 claims description 6
- 230000020477 pH reduction Effects 0.000 claims description 6
- 239000002253 acid Substances 0.000 claims description 5
- 238000007599 discharging Methods 0.000 claims description 5
- 239000003337 fertilizer Substances 0.000 claims description 5
- 238000004519 manufacturing process Methods 0.000 claims description 5
- 238000011084 recovery Methods 0.000 claims description 4
- 230000009471 action Effects 0.000 claims description 3
- 239000003814 drug Substances 0.000 claims description 3
- 230000005484 gravity Effects 0.000 claims description 3
- 239000011777 magnesium Substances 0.000 claims description 3
- 238000000926 separation method Methods 0.000 claims description 3
- 239000013589 supplement Substances 0.000 claims description 3
- 230000035484 reaction time Effects 0.000 claims 2
- 239000003795 chemical substances by application Substances 0.000 claims 1
- 239000000203 mixture Substances 0.000 claims 1
- 230000001376 precipitating effect Effects 0.000 claims 1
- 230000009467 reduction Effects 0.000 abstract description 5
- 239000010865 sewage Substances 0.000 description 12
- OKKJLVBELUTLKV-UHFFFAOYSA-N Methanol Chemical compound OC OKKJLVBELUTLKV-UHFFFAOYSA-N 0.000 description 6
- 230000008569 process Effects 0.000 description 6
- 230000003301 hydrolyzing effect Effects 0.000 description 4
- 238000004064 recycling Methods 0.000 description 3
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 description 2
- 239000003513 alkali Substances 0.000 description 2
- CKMXBZGNNVIXHC-UHFFFAOYSA-L ammonium magnesium phosphate hexahydrate Chemical compound [NH4+].O.O.O.O.O.O.[Mg+2].[O-]P([O-])([O-])=O CKMXBZGNNVIXHC-UHFFFAOYSA-L 0.000 description 2
- 238000009388 chemical precipitation Methods 0.000 description 2
- 239000013078 crystal Substances 0.000 description 2
- 230000003834 intracellular effect Effects 0.000 description 2
- 230000014759 maintenance of location Effects 0.000 description 2
- 239000005416 organic matter Substances 0.000 description 2
- 230000003647 oxidation Effects 0.000 description 2
- 238000007254 oxidation reaction Methods 0.000 description 2
- 239000000243 solution Substances 0.000 description 2
- 229910052567 struvite Inorganic materials 0.000 description 2
- 238000006467 substitution reaction Methods 0.000 description 2
- 241000894006 Bacteria Species 0.000 description 1
- VMHLLURERBWHNL-UHFFFAOYSA-M Sodium acetate Chemical compound [Na+].CC([O-])=O VMHLLURERBWHNL-UHFFFAOYSA-M 0.000 description 1
- YUWBVKYVJWNVLE-UHFFFAOYSA-N [N].[P] Chemical compound [N].[P] YUWBVKYVJWNVLE-UHFFFAOYSA-N 0.000 description 1
- 235000011054 acetic acid Nutrition 0.000 description 1
- 150000001243 acetic acids Chemical class 0.000 description 1
- 150000001720 carbohydrates Chemical class 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 235000014113 dietary fatty acids Nutrition 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 239000000194 fatty acid Substances 0.000 description 1
- 229930195729 fatty acid Natural products 0.000 description 1
- 150000004665 fatty acids Chemical class 0.000 description 1
- 230000002349 favourable effect Effects 0.000 description 1
- 229960002261 magnesium phosphate Drugs 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 239000000047 product Substances 0.000 description 1
- 150000004672 propanoic acids Chemical class 0.000 description 1
- 235000019260 propionic acid Nutrition 0.000 description 1
- 102000004169 proteins and genes Human genes 0.000 description 1
- 108090000623 proteins and genes Proteins 0.000 description 1
- 239000001632 sodium acetate Substances 0.000 description 1
- 235000017281 sodium acetate Nutrition 0.000 description 1
- 239000000758 substrate Substances 0.000 description 1
Images
Classifications
-
- 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
-
- 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
- C02F11/00—Treatment of sludge; Devices therefor
- C02F11/02—Biological treatment
- C02F11/04—Anaerobic treatment; Production of methane by such processes
-
- 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
- C02F11/10—Treatment of sludge; Devices therefor by pyrolysis
Abstract
The invention discloses a system and a method for obtaining a carbon source by utilizing high-temperature enhanced sludge hydrolysis. The system comprises a sludge concentration tank, the bottom of which is communicated with the sludge cracking tank and the sludge hydrolysis tank through a sludge discharge pipeline; the sludge cracking tank is a sealed tank, a heating device is arranged on the tank body, and the sludge cracking tank is communicated with the sludge hydrolysis tank through a sludge discharge pipe; the sludge hydrolysis tank is provided with an alkaline chemical feeding device and a stirring device, the upper part of the sludge hydrolysis tank is communicated with the chemical sedimentation tank through a water outlet pipe, and the bottom of the sludge hydrolysis tank is communicated with sludge treatment equipment through a sludge discharge pipe; the chemical sedimentation tank is provided with an alkaline dosing device, a phosphate dosing device and a magnesium salt dosing device and is provided with a stirring device, the upper part of the chemical sedimentation tank is communicated with the anaerobic section of the biological tank through a water outlet pipe, and a discharge port is arranged at the bottom of the chemical sedimentation tank. The invention can realize resource utilization of sludge carbon source and nitrogen and phosphorus and reduction treatment of sludge.
Description
Technical Field
The invention relates to a system and a method for obtaining a carbon source by utilizing high-temperature reinforced sludge hydrolysis,
background
At present, the C/N ratio of inlet water of urban sewage treatment plants in China is generally low, and the nitrogen and phosphorus removal effect is poor due to insufficient carbon sources. With the stricter discharge standard, extra carbon sources (such as methanol, sodium acetate and the like) are required to be added in the operation process of a sewage plant to ensure that the effluent reaches the standard and is discharged, but the addition of the external carbon source greatly increases the sewage treatment cost. The search for suitable carbon sources has become a focus of current interest.
In addition, the treatment and disposal of municipal sludge has become a bottleneck problem that restricts the development of the whole sewage treatment industry. The research and application of the hydrolysis acidification process of the municipal sludge and the products thereof in the fields of sewage and sludge treatment and resource utilization have attracted extensive attention. Hydrolytic acidification of sludge can produce more soluble organics including high concentrations of Volatile Fatty Acids (VFAs), of which acetic and propionic acids are favorable substrates for enhanced biological denitrification, possessing higher denitrification rates than methanol and ethanol.
The excess sludge contains a large amount of substances such as protein, carbohydrate and the like, and in an anaerobic environment, the acid-producing hydrolytic bacteria can utilize the organic matters in the sludge to produce VFAs, so that the anaerobic hydrolysis of the excess sludge can provide a carbon source for biological sewage treatment, can also realize sludge reduction, and provides a new idea for improving the nitrogen and phosphorus removal efficiency of the sewage and realizing sludge recycling and reduction.
Disclosure of Invention
Aiming at the defects in the prior art, the invention utilizes high temperature to carry out cracking pretreatment on excess sludge, adjusts the alkaline environment to optimize the anaerobic hydrolysis process of the sludge, thereby releasing a high-quality carbon source, recovering nitrogen and phosphorus elements, improving the sludge settling performance, and providing the excess sludge hydrolysis system and the method for synchronously realizing sludge reclamation and reduction.
In order to achieve the aim, the system for obtaining the carbon source by utilizing high-temperature reinforced sludge hydrolysis comprises a sludge concentration tank, a sludge degradation tank, a sludge hydrolysis tank and a chemical sedimentation tank which are sequentially communicated; wherein the content of the first and second substances,
the bottom of the sludge concentration tank is communicated with the sludge degradation tank and the sludge hydrolysis tank through a sludge discharge pipeline, and a sludge discharge pump is arranged on the sludge discharge pipeline;
the sludge cracking tank is a sealed tank, and a heating device is arranged on the tank body and can heat the sludge to 80-120 ℃; the sludge cracking tank is communicated with the sludge hydrolysis tank through a sludge discharge pipe;
the sludge hydrolysis tank is provided with an alkaline chemical feeding device and a stirring device, the upper part of the sludge hydrolysis tank is communicated with the chemical sedimentation tank through a water outlet pipe, and the bottom of the sludge hydrolysis tank is communicated with sludge treatment equipment through a sludge discharge pipe;
the chemical sedimentation tank is provided with an alkaline dosing device, a phosphate dosing device, a magnesium salt dosing device and a stirring device, and the upper part of the chemical sedimentation tank is communicated with the anaerobic section of the biological tank through a water outlet pipe to realize the recycling of carbon sources; the bottom of the chemical sedimentation tank is provided with a discharge port. Wherein the biological pond is A 2 An O biochemical pool or an oxidation ditch, and other processes with the functions of removing nitrogen and phosphorus and removing organic matters which are improved on the basis of the O biochemical pool or the oxidation ditch.
In order to adjust the proportion of the excess sludge entering the sludge degradation tank and the sludge hydrolysis tank, the sludge inlet pipe is provided with a flow regulating valve 3 and a flow regulating valve 4 which are used for adjusting the amount of the excess sludge entering the sludge degradation tank and the sludge hydrolysis tank; the flow regulating valve 6 is used for regulating the proportion of the cracked sludge and the residual sludge which participate in the reaction.
In order to achieve the purpose, the method for obtaining the carbon source by utilizing high-temperature reinforced sludge hydrolysis comprises the following steps:
step 1, after the excess sludge is concentrated in a sludge concentration tank, shunting a part of concentrated bottom sludge to a sludge disintegration tank, heating to 80-120 ℃, controlling the retention time to be about 15min, so that the excess sludge floc structure is destroyed, sludge cells are disintegrated, intracellular substances are released, and the obtained disintegrated sludge enters a sludge hydrolysis tank.
Step 2, after the excess sludge is concentrated in a sludge concentration tank, shunting a part of the concentrated bottom sludge to a sludge hydrolysis tank, uniformly mixing the bottom sludge with the cracked sludge obtained in the step 1, and using NaOH and Ca (OH) 2 The pH value of the sludge is adjusted to 10 +/-0.1 by the mixed liquid, mechanical stirring is assisted, the anaerobic reaction of organic matters is controlled in an acid production stage under the alkaline anaerobic environment, solid refractory organic matters in the sludge are converted into soluble and easily degradable carbon sources such as VFAs and the like, and inorganic nitrogen and phosphorus are released.
Step 3, discharging the hydrolysis supernatant obtained in the step 2 into a chemical sedimentation tank, adding phosphate and magnesium salt, controlling N/P to be 0.8-1.6 and Mg/N to be 1.0-1.6, and using NaOH and Ca (OH) 2 The pH value of the mixed solution is adjusted to 10 +/-0.1, mechanical stirring is adopted at the same time, the mixed solution and the hydrolytic acidification solution are fully mixed and reacted, then the solid-liquid separation is completed through the sedimentation of the mixed solution under the action of gravity, the supernatant is discharged into an anaerobic section of a biological tank to supplement a carbon source, and the settled solid substance can be used as a fertilizer to realize the recovery of nitrogen and phosphorus.
The sludge hydrolysis system can be directly embedded into a residual sludge pipeline of a sewage treatment process, can also be accessed as a bypass system, and can flexibly adjust the use working condition according to the actual condition so as to realize resource utilization of a sludge carbon source and nitrogen and phosphorus and reduction treatment of sludge.
And part of the residual sludge enters a sludge cracking tank from the sludge concentration tank, and the sludge with high organic matter content is cracked in the sludge cracking tank through measures such as high-temperature pressurization and the like. The decomposed sludge enters a sludge hydrolysis tank to be fully mixed with untreated residual sludge, and hydrolysis acid production reaction is carried out in an alkaline anaerobic environment, so that solid refractory organic matters in the sludge are converted into soluble and easily degradable carbon sources such as VFAs and the like, and inorganic nitrogen and phosphorus are released. The hydrolysis acidification liquid enters a chemical sedimentation tank, nitrogen and phosphorus elements in the hydrolysis liquid are recovered by adding magnesium salt and phosphate, and the generated struvite crystals can be recovered as fertilizer; the supernatant is discharged into the anaerobic section of the biological tank as a carbon source, so that the nitrogen and phosphorus removal efficiency and the organic matter removal efficiency are improved.
Compared with the prior art, the invention has the following advantages:
1. the carbon source of the residual sludge is recycled by a high-temperature reinforced sludge hydrolysis system, and the sludge hydrolysis carbon source flows back to a sewage treatment system, so that the competition of anoxic denitrification and anaerobic phosphorus release carbon sources can be effectively relieved, the nitrogen and phosphorus removal efficiency of the sewage is improved, and the water quality of the effluent is guaranteed. Meanwhile, the carbon source recycling of the sludge reduces the addition of an external carbon source, and can effectively reduce the operating cost of a sewage plant.
2. The anaerobic sludge hydrolysis system not only reduces the discharge of the residual sludge in the sewage plant, but also improves the sedimentation performance of the discharged sludge by adding a medicament, thereby greatly reducing the sludge treatment cost.
3. The nitrogen and phosphorus elements in the excess sludge are enriched and recovered in the form of struvite crystals, and can be used as a slow release fertilizer for agricultural and forestry production, so that the resource utilization of the sludge is realized.
Drawings
FIG. 1 is a schematic flow diagram of a system and a method for obtaining a carbon source by using high-temperature enhanced sludge hydrolysis
In the figure, 1-sludge concentration tank, 2-sludge discharge pump, 3-flow regulating valve, 4-flow regulating valve, 5-sludge cracking tank, 6-flow regulating valve, 7-sludge hydrolysis tank, 8-stirring device, 9-alkali liquor dosing pump, 10-chemical precipitation tank, 11-stirring device, 12-alkali liquor dosing pump, 13-phosphate dosing pump and 14-magnesium salt dosing pump
Detailed Description
Embodiments of the present invention will be described in detail below with reference to the accompanying drawings.
In the description of the present invention, it is to be understood that the terms "center", "upper", "lower", "front", "rear", "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 only for convenience of description and simplicity of 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.
The terms "first", "second" and "first" 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" or "second" 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; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.
One embodiment of the system of the invention is shown in fig. 1, and comprises a sludge concentration tank 1, a sludge cracking tank 5, a sludge hydrolysis tank 7 and a chemical precipitation tank 10 in sequence according to a treatment process.
The sludge concentration tank 1 is provided with a sludge discharge pump 2 for discharging concentrated sludge, and the sludge concentration tank 1 is communicated with a sludge cracking tank 5 and a sludge hydrolysis tank 7 through a sludge discharge pipe;
the sludge cracking tank 5 adopts the structural form of an autoclave and is communicated with the sludge hydrolysis tank 7 through a sludge discharge pipe;
the sludge hydrolysis tank 7 is provided with an alkaline chemical feeding device 9 and a stirring device 8, the upper part of the sludge hydrolysis tank 7 is communicated with a chemical sedimentation tank 10 through a water outlet pipe, and the bottom of the sludge hydrolysis tank 7 is communicated with sludge treatment equipment through a sludge discharge pipe;
The invention also discloses a method for obtaining a carbon source by utilizing high-temperature enhanced sludge hydrolysis, which comprises the following steps:
step 1, after the excess sludge is concentrated in a sludge concentration tank, shunting a part of concentrated bottom sludge to a sludge disintegration tank, heating to 80-120 ℃, controlling the retention time to be about 15min, so that the excess sludge floc structure is destroyed, sludge cells are disintegrated, intracellular substances are released, and the obtained disintegrated sludge enters a sludge hydrolysis tank.
Step 2, after the excess sludge is concentrated in a sludge concentration tank, shunting a part of the concentrated bottom sludge to a sludge hydrolysis tank, uniformly mixing the bottom sludge with the cracked sludge obtained in the step 1, and using NaOH and Ca (OH) 2 The pH value of the sludge is adjusted to 10 +/-0.1 by the mixed liquid, mechanical stirring is assisted, the anaerobic reaction of organic matters is controlled in an acid production stage under the alkaline anaerobic environment, solid refractory organic matters in the sludge are converted into soluble and easily degradable carbon sources such as VFAs and the like, and inorganic nitrogen and phosphorus are released.
Step 3, discharging the hydrolysis supernatant obtained in the step 2 into a chemical sedimentation tank, adding phosphate and magnesium salt, controlling N/P to be 0.8-1.6 and Mg/N to be 1.0-1.6, and using NaOH and Ca (OH) 2 The pH value of the mixed solution is adjusted to 10 +/-0.1, mechanical stirring is adopted at the same time, the mixed solution and the hydrolytic acidification solution are fully mixed and reacted, then the solid-liquid separation is completed through the sedimentation of the mixed solution under the action of gravity, the supernatant is discharged into an anaerobic section of a biological tank to supplement a carbon source, and the settled solid substance can be used as a fertilizer to realize the recovery of nitrogen and phosphorus.
According to the above embodiment, preferably, in the step 2, the volume ratio of the excess sludge participating in the reaction to the cracked sludge is 1-4 by controlling the flow regulating valve.
In the description herein, particular features, structures, materials, or characteristics may be combined in any suitable manner in any one or more embodiments or examples.
The above description is only for the specific embodiments of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art can easily conceive of the changes or substitutions within the technical scope of the present invention, and all the changes or substitutions should be covered within the scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the appended claims.
Claims (6)
1. A system for obtaining a carbon source by utilizing high-temperature enhanced sludge hydrolysis is characterized by comprising a sludge concentration tank, a sludge degradation tank, a sludge hydrolysis tank and a chemical sedimentation tank which are sequentially communicated; wherein the content of the first and second substances,
the bottom of the sludge concentration tank is communicated with the sludge degradation tank and the sludge hydrolysis tank through a sludge discharge pipeline, and a sludge discharge pump is arranged on the sludge discharge pipeline;
the sludge cracking tank is a sealed tank, a heating device is arranged on the tank body and used for heating sludge in the tank body to 80-120 ℃, and the sludge cracking tank is communicated with the sludge hydrolysis tank through a sludge discharge pipe;
the sludge hydrolysis tank is provided with an alkaline chemical feeding device and a stirring device, the upper part of the sludge hydrolysis tank is communicated with the chemical sedimentation tank through a water outlet pipe, and the bottom of the sludge hydrolysis tank is communicated with sludge treatment equipment through a sludge discharge pipe;
the chemical sedimentation tank is provided with an alkaline dosing device, a phosphate dosing device and a magnesium salt dosing device and is provided with a stirring device, the upper part of the chemical sedimentation tank is communicated with the anaerobic section of the biological tank through a water outlet pipe, and a discharge port is arranged at the bottom of the chemical sedimentation tank.
2. A method for obtaining a carbon source by utilizing high-temperature enhanced sludge hydrolysis is characterized by comprising the following steps:
step 1, concentrating the excess sludge in a sludge concentration tank;
step 2, shunting a part of the concentrated bottom sludge to a sludge cracking tank, controlling the heating temperature and the reaction time to destroy the structure of the residual sludge flocs, cracking sludge cells, releasing substances in cells, and allowing the obtained cracked sludge to enter a sludge hydrolysis tank;
shunting the other part of the concentrated bottom sludge to a sludge hydrolysis tank, uniformly mixing the bottom sludge with the decomposed sludge, adjusting the pH to 10 +/-0.1 by using an alkaline medicament, simultaneously controlling the anaerobic reaction of organic matters in an acid production stage under an alkaline anaerobic environment by assisting mechanical stirring, converting solid refractory organic matters in the sludge into a soluble easily-degradable carbon source, and releasing inorganic nitrogen and phosphorus;
step 3, discharging the hydrolysis supernatant obtained in the step 2 into a chemical sedimentation tank, adding phosphate and magnesium salt, adding an alkaline medicament to adjust the pH to 10 +/-0.1, simultaneously adding mechanical stirring to fully mix and react with hydrolysis acidification liquid, and then precipitating through the action of gravity to complete solid-liquid separation;
and 4, discharging the supernatant into an anaerobic section of the biological pond to supplement a carbon source, and taking the precipitated solid substances as fertilizers to realize nitrogen and phosphorus recovery.
3. The method for obtaining the carbon source by utilizing the high-temperature enhanced sludge hydrolysis as claimed in claim 2, wherein the sludge cracking temperature in the step 1 is 80-120 ℃, and the reaction time is about 15 min.
4. The method for obtaining carbon source by utilizing high temperature to intensify sludge hydrolysis as claimed in claim 2, wherein the alkaline agents of step 2 and step 3 are NaOH and Ca (OH) 2 The mixed solution of (2).
5. The method for obtaining carbon source by utilizing high temperature enhanced sludge hydrolysis as claimed in claim 2, wherein the addition amount of the phosphate and magnesium salt in step 3 is controlled according to N/P = 0.8-1.6 and Mg/N = 1.0-1.6.
6. The method for obtaining carbon source by utilizing high temperature enhanced sludge hydrolysis as claimed in claim 2, wherein the volume ratio of the excess sludge participating in the reaction to the sludge to be broken is 1-4 by controlling the flow regulating valve.
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| CN113698052A (en) * | 2021-08-02 | 2021-11-26 | 广东卓信环境科技股份有限公司 | Municipal sludge organic matter concentration recycling process |
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