CN110615593A - Method for separating active sludge biomass by high-speed mechanical cyclone - Google Patents
Method for separating active sludge biomass by high-speed mechanical cyclone Download PDFInfo
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- CN110615593A CN110615593A CN201911030486.2A CN201911030486A CN110615593A CN 110615593 A CN110615593 A CN 110615593A CN 201911030486 A CN201911030486 A CN 201911030486A CN 110615593 A CN110615593 A CN 110615593A
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- activated sludge
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F11/00—Treatment of sludge; Devices therefor
- C02F11/12—Treatment of sludge; Devices therefor by de-watering, drying or thickening
- C02F11/14—Treatment of sludge; Devices therefor by de-watering, drying or thickening with addition of chemical agents
- C02F11/143—Treatment of sludge; Devices therefor by de-watering, drying or thickening with addition of chemical agents using inorganic substances
- C02F11/145—Treatment of sludge; Devices therefor by de-watering, drying or thickening with addition of chemical agents using inorganic substances using calcium compounds
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F11/00—Treatment of sludge; Devices therefor
- C02F11/12—Treatment of sludge; Devices therefor by de-watering, drying or thickening
- C02F11/121—Treatment of sludge; Devices therefor by de-watering, drying or thickening by mechanical de-watering
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2303/00—Specific treatment goals
- C02F2303/06—Sludge reduction, e.g. by lysis
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E50/00—Technologies for the production of fuel of non-fossil origin
- Y02E50/30—Fuel from waste, e.g. synthetic alcohol or diesel
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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Life Sciences & Earth Sciences (AREA)
- Hydrology & Water Resources (AREA)
- Environmental & Geological Engineering (AREA)
- Water Supply & Treatment (AREA)
- Organic Chemistry (AREA)
- Chemical Kinetics & Catalysis (AREA)
- General Chemical & Material Sciences (AREA)
- Mechanical Engineering (AREA)
- Treatment Of Sludge (AREA)
Abstract
The invention relates to a method for separating activated sludge biomass by high-speed mechanical cyclone, wherein the biomass comprises extracellular substances and intracellular substances; the method comprises the following steps: the mechanical force of high-speed rotation is directly acted on the activated sludge to form hydraulic rotational flow at the same time; under the dual actions of crushing by high-speed mechanical force and hydraulic cyclone, the biomass substance of the activated sludge is separated and dissolved out. The high-speed mechanical cyclone method is adopted, and hot alkali conditions are assisted, so that the comprehensive effects of machinery, water power, temperature and chemistry are formed, extracellular substances in the activated sludge are mainly separated and dissolved, and the separation, dissolution, hydrolysis and extraction efficiency of the activated sludge biomass is greatly improved.
Description
Technical Field
The invention relates to the technical field of sludge treatment, in particular to a method for separating activated sludge biomass under the dual actions of high-speed mechanical crushing and hydraulic cyclone.
Background
The sludge generated by the urban sewage treatment plant is not effectively treated for a long time, and the problem of environmental pollution is increasingly prominent; the sanitary landfill and dry incineration disposal methods adopted in recent years not only consume a large amount of land and energy, but also still have environmental risks. The related national departments clearly put forward the aims of 'green, circulation and low carbon' of sludge treatment, and require the strengthening of 'resource' utilization on the premise of ensuring 'harmlessness'. Under the guidance and promotion of national policies, new sludge treatment technologies aiming at improving the recycling efficiency are mainly divided into two types, namely, organic matters of sludge are converted into biomass energy such as methane through efficient anaerobic digestion; secondly, extracting protein substances in the sludge by adopting a hot alkali hydrolysis method, and preparing the protein substances to be used as agricultural liquid fertilizer. The above prior art is described as follows:
1. the microbial cell wall breaking technology of high-temperature pyrohydrolysis flash evaporation comprises the following steps:
directly heating activated sludge with a solid content of 8-12% to 160-180 ℃ by steam, and instantly reducing pressure by a flash evaporation method to enable the microbial cell walls to be broken by pressure difference formed inside and outside the microbial cell walls, releasing and dissolving out substances in the microbial cells, providing favorable conditions for subsequent biological reactions (mainly anaerobic digestion), improving the reaction efficiency and increasing the yield of methane;
however, it has the following disadvantages:
(1) the resource target is mainly methane, and liquid resource is lost. The technology aims at providing services for subsequent processes such as anaerobic digestion and the like, the recycling aim is mainly to utilize biogas products, and the liquid recycling prospect is not optimistic. According to the mechanism, the protein substances of the activated sludge are decomposed and destroyed in the anaerobic digestion process of the technology, the high-concentration ammonia nitrogen contained in the generated liquid is easy to decompose and volatilize, the current technical conditions do not have the possibility of producing high-value resource products, and the high-value resource products can only be discharged after reaching the standard through sewage treatment under most conditions.
(2) The high ammonia nitrogen wastewater treatment difficulty is high, the cost is high, the existing nitrification and denitrification process has high energy consumption, and a large amount of carbon sources need to be added, so the cost is huge; the anaerobic ammonia oxidation of the emerging process is only in a test stage and does not have large-scale engineering conditions.
(3) The concentration of refractory organics is high, the treatment is difficult, the Maillard reaction is aggravated in the high-temperature (160-180 ℃) environment in the thermal hydrolysis process, high-concentration refractory organics and chromaticity are formed, the sewage treatment is extremely difficult to reach the standard, and the overproof risk is extremely high.
(4) And finally, the sludge is difficult to dewater, and a large amount of chemical agents (particularly acidic substances) are required to be added before dewatering to obtain a sludge cake with the water content of less than 60 percent, so that the cost is increased, and adverse factors are brought to subsequent dewatering liquid treatment and sludge cake utilization.
2. The thermokalite reaction is assisted with the technology of extracting substances containing protein, polypeptide and the like by flash-evaporation microbial cell wall breaking:
adding alkaline substances such as lime and the like and sludge into activated sludge with the solid content of 12% -15% in a reaction vessel, directly or indirectly heating to 120 ℃, and simultaneously stirring at a low speed (tens of revolutions per minute) by using vertical paddle type stirring equipment to ensure that the materials are mixed at a high speed and are heated uniformly; after the design temperature of 120 ℃ is reached, the reaction lasts for more than 110 minutes, then the materials are discharged in a flash evaporation mode, solid-liquid separation is realized by adopting plate-frame dehydration equipment, and liquid raw materials are obtained and are prepared to be used as agricultural liquid fertilizer;
but it has significant disadvantages at present:
(1) the reaction mechanism is single, the reaction completely depends on the alkali-heat reaction, the efficiency is low, and the flash evaporation wall-breaking effect is not obvious due to low temperature difference.
(2) The alkali heat condition is difficult to balance, lime and sludge respectively heat a reaction container, the reaction container is completely mixed by slurry stirring (low speed), and the uniformity of alkalinity and temperature is restricted.
(3) The reaction time is long, the reaction time reaches 110 minutes after the design temperature is reached, and the cost, the energy consumption and the like of the reaction container are high.
(4) The process chain is long, the equipment is various, the investment is high, the occupied area is large, and the maintenance and management are relatively complex.
The two technical schemes emphasize on the cell wall breaking to obtain the intracellular substances, the cell wall breaking is very difficult, the cell wall breaking is realized by adopting the modes of strong acid-base corrosion, high-temperature pyrohydrolysis and flash evaporation, long-time thermokalite reaction and the like, the cost is high, the energy consumption is high, the chemical pollution risk possibly exists and the like, and particularly, the thermokalite reaction mode is independently adopted, the time is long, and the influence of the temperature and the alkaline mixing speed and the uniformity degree is avoided.
Disclosure of Invention
In order to solve the problems, the invention provides a method for separating activated sludge biomass by high-speed mechanical cyclone.
The technical scheme of the invention is as follows:
a method of high speed mechanical cyclonic separation of activated sludge biomass, the biomass comprising extracellular material and intracellular material; the method comprises the following steps: the mechanical force of high-speed rotation is directly acted on the activated sludge to form hydraulic rotational flow at the same time; under the dual actions of crushing by high-speed mechanical force and hydraulic cyclone, the biomass substance of the activated sludge is separated and dissolved out.
Researches show that the biomass of the activated sludge exists in a large amount outside microbial cells, including zoogloea constituent substances, floc substances, Extracellular Polymeric Substances (EPS) and the like, wherein the EPS contribution is the largest and accounts for about 40-60% of the total biomass of the activated sludge. By nature, these extracellular substances belong to the microbial products, but are not equivalent to the microbial intracellular substances. In activated sludge, the extracellular substances account for nearly 90% of available biomass and have a relatively loose structure, while the intracellular substances are few and only account for about 10% of the available biomass; based on the method, the extracellular substances in the activated sludge are mainly separated and dissolved out by a high-speed mechanical cyclone method, the activated sludge flocs, zoogloea, Extracellular Polymeric Substances (EPS) and other extracellular substances are subjected to strong crushing and shearing under the double actions of high-speed mechanical force and hydraulic cyclone, the activated sludge is micronized and gelatinized as much as possible, the specific surface area of the activated sludge is increased, and the separation and dissolution of the extracellular substances are accelerated by the friction and leaching actions formed by machinery and water power; of course, the high-speed mechanical cyclone inevitably plays a certain role in breaking cell walls, and intracellular substances are also discharged.
Adding the activated sludge into a reaction container; the mechanical force is generated by the rotation of the high-speed mechanical crushing device at the rotating speed of 600 and 690 r/s; the high-speed mechanical crushing device is fixedly arranged on the reaction container.
The high-speed mechanical crushing device comprises a rotating shaft, the rotating shaft penetrates through the top of the reaction container and extends into the reaction container, the lower end of the rotating shaft is provided with a crushing device, the crushing device comprises a disc body, the center of the disc body is fixedly connected with the rotating shaft, the outer circumference of the disc body is uniformly provided with a plurality of upper folding edges and a plurality of lower folding edges, the upper folding edges and the lower folding edges are staggered on the outer circumference of the disc body, and the rotating shaft is driven by a driving mechanism to rotate to drive the crushing device; activated sludge is immersed in the disc body; by adopting the high-speed mechanical crushing device with the structure, the crushing device rotates, and under the combined action of the upper folding edge and the lower folding edge, the activated sludge is stirred, and is crushed and sheared at high speed, and meanwhile, high-speed hydraulic cyclone is formed, so that the rubbing and leaching effects are achieved, and the separation and the elution of extracellular substances are accelerated; of course, the high-speed mechanical cyclone inevitably plays a certain role in breaking cell walls, and intracellular substances are also discharged.
Adding calcium oxide into the reaction container in proportion, and heating by a heating device arranged on the reaction container to form a thermokalite condition; preferably, an interlayer space is formed on the side wall of the reaction vessel, and a heating medium is circulated in the interlayer space to form a heating device, wherein the heating medium is steam, hot oil or hot water; of course, heating coils or electrical heating can also be used to meet the requirements of the application.
The reaction vessel is connected with the pipeline mixer through a pipeline; the activated sludge is pressurized and enters a pipeline type mixer, and simultaneously, a calcium oxide solution is injected according to a certain proportion, is uniformly mixed by the pipeline mixer and is sent into a reaction container. Preferably, the activated sludge with the solid content of about 20 percent enters a pipeline type mixer in a pressurizing way, and simultaneously, the calcium oxide solution is injected according to a certain proportion, so that the calcium oxide solution is immersed into the activated sludge strongly and then enters a subsequent reaction container. Compared with the existing method that the calcium oxide solution is firstly added into the reaction vessel and then mechanically stirred, the method greatly improves the mixing efficiency, saves the adding amount of calcium oxide by about 30 percent, and reduces the mixing time by about 60 percent.
The driving mechanism is a motor fixedly arranged on the reaction vessel, and the motor is connected with the rotating shaft in a driving way and drives the rotating shaft to rotate; is convenient to control.
The invention has the advantages that the design is reasonable, the concept is ingenious, the adopted high-speed mechanical cyclone method and the thermokalite condition are assisted to form the comprehensive effects of machinery, water power, temperature and chemistry, the extracellular substances in the activated sludge are mainly separated and dissolved, and the separation, dissolution, hydrolysis and extraction efficiency of the activated sludge biomass is greatly improved; compared with the existing thermokalite technology, the reaction time is shortened by 50-70%, the energy consumption is reduced by 40-60%, the biomass extraction rate is improved by more than 20%, the equipment is reduced by about 50% (table set), the investment and the occupied area are greatly reduced, the maintenance and the management are simple and convenient, the condition of the prior art is fundamentally changed, and the thermokalite technology has obvious technical, economic, environmental and social benefits.
Drawings
FIG. 1 is a schematic view of the structure of a reaction vessel.
Fig. 2 is a schematic view of the structure of the crushing device.
In the figure, a rotating shaft 2-1 of a reaction container 1, a crushing device 2-2, a disc body 2-2-1, an upper folded edge 2-2-2, a lower folded edge 2-2-3 and a motor 2-3 are arranged.
Detailed Description
1-2, a method of high speed mechanical cyclonic separation of activated sludge biomass, the biomass comprising extracellular material and intracellular material; pressurizing activated sludge with the solid content of about 20 percent into a pipeline type mixer, simultaneously injecting a calcium oxide solution according to a certain proportion, so that the calcium oxide solution is immersed into the activated sludge strongly, and then enters a subsequent reaction container; the high-speed mechanical crushing device is fixedly arranged on the reaction vessel 1 and comprises a rotating shaft 2-1, the rotating shaft 2-1 penetrates through the top of the reaction vessel 1 and extends into the reaction vessel 1, a crushing device 2-2 is fixedly arranged on the disc body, the crushing device 2-2 comprises a disc body 2-2-1, the center of the disc body 2-2-1 is fixedly connected with a rotating shaft 2-1, a plurality of upper folding edges 2-2-2 and a plurality of lower folding edges 2-2-3 are uniformly arranged on the outer circumference of the disc body 2-2-1, the upper folding edges 2-2-2 and the lower folding edges 2-2-3 are staggered on the outer circumference of the disc body 2-2-1, the rotating shaft 2-1 is driven to rotate at a high speed by a motor 2-3 fixedly arranged on the reaction vessel 1; the method comprises the following steps: the mechanical force of high-speed rotation is directly acted on the activated sludge to form hydraulic rotational flow at the same time; under the dual actions of crushing by high-speed mechanical force and hydraulic cyclone, the biomass substance of the activated sludge is separated and dissolved out.
Because of the limited character expression, there exist practically unlimited specific structures, and it will be apparent to those skilled in the art that a number of improvements, decorations, or changes may be made without departing from the principles of the present invention, or the above technical features may be combined in a suitable manner; such modifications, variations, combinations, or adaptations of the invention using its spirit and scope, as defined by the claims, may be directed to other uses and embodiments.
Claims (6)
1. A method of high speed mechanical cyclonic separation of activated sludge biomass, the biomass comprising extracellular material and intracellular material; the method is characterized by comprising the following steps: the mechanical force of high-speed rotation is directly acted on the activated sludge to form hydraulic rotational flow at the same time; under the dual actions of crushing by high-speed mechanical force and hydraulic cyclone, the biomass substance of the activated sludge is separated and dissolved out.
2. The method for high-speed mechanical cyclone separation of activated sludge biomass as claimed in claim 1, characterized in that the activated sludge is added into a reaction vessel; the mechanical force is generated by the rotation of the high-speed mechanical crushing device at the rotating speed of 600 and 690 r/s; the high-speed mechanical crushing device is fixedly arranged on the reaction container.
3. The method for high-speed mechanical cyclone separation of activated sludge biomass as claimed in claim 2, wherein the high-speed mechanical crushing device comprises a rotating shaft, the rotating shaft passes through the top of the reaction vessel and extends into the reaction vessel, the lower end of the rotating shaft is provided with a crushing device, the crushing device comprises a disc body, the center of the disc body is fixedly connected with the rotating shaft, the outer circumference of the disc body is uniformly provided with a plurality of upper folding edges and a plurality of lower folding edges, the upper folding edges and the lower folding edges are staggered on the outer circumference of the disc body, and the rotating shaft is driven by a driving mechanism to rotate to drive the crushing device to rotate; the disk body is submerged with activated sludge.
4. The method for high-speed mechanical cyclone separation of activated sludge biomass as claimed in claim 2, wherein calcium oxide is added into the reaction vessel in proportion and heated by a heating device arranged on the reaction vessel to form hot alkali condition.
5. The method for high-speed mechanical cyclone separation of activated sludge biomass as claimed in claim 4, wherein the reaction vessel is connected to the pipeline mixer through a pipeline; the activated sludge is pressurized and enters a pipeline type mixer, and simultaneously, a calcium oxide solution is injected according to a certain proportion, is uniformly mixed by the pipeline mixer and is sent into a reaction container.
6. The method for high-speed mechanical cyclone separation of activated sludge biomass as claimed in claim 3, wherein the driving mechanism is a motor fixedly installed on the reaction vessel, and the motor is connected with the rotating shaft in a driving manner to drive the rotating shaft to rotate.
Priority Applications (2)
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| CN201911030486.2A CN110615593A (en) | 2019-10-28 | 2019-10-28 | Method for separating active sludge biomass by high-speed mechanical cyclone |
| CN202010083446.0A CN111547975B (en) | 2019-10-28 | 2020-02-09 | Method for separating active sludge biomass by high-speed mechanical cyclone |
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| CN201911030486.2A CN110615593A (en) | 2019-10-28 | 2019-10-28 | Method for separating active sludge biomass by high-speed mechanical cyclone |
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| CN202010083446.0A Active CN111547975B (en) | 2019-10-28 | 2020-02-09 | Method for separating active sludge biomass by high-speed mechanical cyclone |
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Cited By (5)
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| CN111217505A (en) * | 2020-02-09 | 2020-06-02 | 北京汇园生态科技有限公司 | Method for improving heating efficiency by high-speed mixing of cold and hot sludge |
| CN111606476A (en) * | 2020-05-26 | 2020-09-01 | 郑州众然供应链管理有限公司 | Microorganism inactivation device |
| CN111732300A (en) * | 2020-06-05 | 2020-10-02 | 同济大学 | Pretreatment technical method for strengthening three-phase separation of sludge |
| CN112624650A (en) * | 2021-01-07 | 2021-04-09 | 张悦 | Microbial organic high-calcium mud material for manufacturing adsorptive plates and preparation method thereof |
| CN112812968A (en) * | 2020-12-31 | 2021-05-18 | 江苏优联环境发展有限公司 | Method for grinding and separating activated sludge biomass |
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| CN112094005A (en) * | 2020-09-08 | 2020-12-18 | 天津壹新环保工程有限公司 | Alkaline pyrohydrolysis treatment method and system for sludge |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| US5681481A (en) * | 1995-05-18 | 1997-10-28 | Rdp Company | Process and apparatus for liquid sludge stabilization |
| TW200611880A (en) * | 2004-10-14 | 2006-04-16 | Bi-Chang Li | The microprocessor unit of bio-sludge-hydrolyzing equipment |
| CN106854033A (en) * | 2017-03-10 | 2017-06-16 | 苏州工业园区中法环境技术有限公司 | Reaction system and method for processing sludge and kitchen garbage |
| CN109205985A (en) * | 2018-10-19 | 2019-01-15 | 长沙汇聚环境技术有限公司 | A kind of method and device of municipal sludge dehydration |
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2019
- 2019-10-28 CN CN201911030486.2A patent/CN110615593A/en active Pending
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- 2020-02-09 CN CN202010083446.0A patent/CN111547975B/en active Active
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN111217505A (en) * | 2020-02-09 | 2020-06-02 | 北京汇园生态科技有限公司 | Method for improving heating efficiency by high-speed mixing of cold and hot sludge |
| CN111217505B (en) * | 2020-02-09 | 2023-04-07 | 北京汇园生态科技有限公司 | Method for improving heating efficiency by high-speed mixing of cold and hot sludge |
| CN111606476A (en) * | 2020-05-26 | 2020-09-01 | 郑州众然供应链管理有限公司 | Microorganism inactivation device |
| CN111732300A (en) * | 2020-06-05 | 2020-10-02 | 同济大学 | Pretreatment technical method for strengthening three-phase separation of sludge |
| CN112812968A (en) * | 2020-12-31 | 2021-05-18 | 江苏优联环境发展有限公司 | Method for grinding and separating activated sludge biomass |
| CN112624650A (en) * | 2021-01-07 | 2021-04-09 | 张悦 | Microbial organic high-calcium mud material for manufacturing adsorptive plates and preparation method thereof |
| CN112624650B (en) * | 2021-01-07 | 2022-08-05 | 张悦 | Microbial organic high-calcium mud material for manufacturing adsorptive plates and preparation method thereof |
Also Published As
| Publication number | Publication date |
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| CN111547975A (en) | 2020-08-18 |
| CN111547975B (en) | 2023-04-11 |
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Application publication date: 20191227 |