CN108002676B - Hydrodynamic cavitation cooperated micro-alkali biochemical sludge treatment integrated sludge reduction machine and treatment system - Google Patents
Hydrodynamic cavitation cooperated micro-alkali biochemical sludge treatment integrated sludge reduction machine and treatment system Download PDFInfo
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- CN108002676B CN108002676B CN201810027854.7A CN201810027854A CN108002676B CN 108002676 B CN108002676 B CN 108002676B CN 201810027854 A CN201810027854 A CN 201810027854A CN 108002676 B CN108002676 B CN 108002676B
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- 239000010802 sludge Substances 0.000 title claims abstract description 92
- 239000003513 alkali Substances 0.000 title claims abstract description 58
- 230000009467 reduction Effects 0.000 title claims abstract description 22
- 238000005273 aeration Methods 0.000 claims abstract description 28
- 238000003756 stirring Methods 0.000 claims abstract description 23
- 239000007788 liquid Substances 0.000 claims abstract description 21
- 230000000903 blocking effect Effects 0.000 claims description 16
- 238000004090 dissolution Methods 0.000 claims 1
- 230000000694 effects Effects 0.000 abstract description 12
- 238000005336 cracking Methods 0.000 abstract description 6
- 238000005265 energy consumption Methods 0.000 abstract description 4
- 230000010354 integration Effects 0.000 abstract 1
- 238000000034 method Methods 0.000 description 10
- 239000010865 sewage Substances 0.000 description 10
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 5
- 239000002585 base Substances 0.000 description 4
- 230000008569 process Effects 0.000 description 4
- HEMHJVSKTPXQMS-UHFFFAOYSA-M Sodium hydroxide Chemical compound [OH-].[Na+] HEMHJVSKTPXQMS-UHFFFAOYSA-M 0.000 description 3
- 230000008859 change Effects 0.000 description 3
- 238000009792 diffusion process Methods 0.000 description 3
- 230000029087 digestion Effects 0.000 description 3
- 230000003203 everyday effect Effects 0.000 description 3
- 239000006228 supernatant Substances 0.000 description 3
- 238000005904 alkaline hydrolysis reaction Methods 0.000 description 2
- 230000008901 benefit Effects 0.000 description 2
- 230000002354 daily effect Effects 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 230000000813 microbial effect Effects 0.000 description 2
- 239000011259 mixed solution Substances 0.000 description 2
- 239000000126 substance Substances 0.000 description 2
- CBENFWSGALASAD-UHFFFAOYSA-N Ozone Chemical compound [O-][O+]=O CBENFWSGALASAD-UHFFFAOYSA-N 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000010170 biological method Methods 0.000 description 1
- 230000009172 bursting Effects 0.000 description 1
- 230000015556 catabolic process Effects 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 230000008602 contraction Effects 0.000 description 1
- 238000006731 degradation reaction Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000007599 discharging Methods 0.000 description 1
- 230000003993 interaction Effects 0.000 description 1
- 230000003834 intracellular effect Effects 0.000 description 1
- 238000010297 mechanical methods and process Methods 0.000 description 1
- 230000007246 mechanism Effects 0.000 description 1
- 244000005700 microbiome Species 0.000 description 1
- 239000005416 organic matter Substances 0.000 description 1
- 230000003647 oxidation Effects 0.000 description 1
- 238000007254 oxidation reaction Methods 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
- BITYAPCSNKJESK-UHFFFAOYSA-N potassiosodium Chemical compound [Na].[K] BITYAPCSNKJESK-UHFFFAOYSA-N 0.000 description 1
- 229910001414 potassium ion Inorganic materials 0.000 description 1
- 238000004064 recycling Methods 0.000 description 1
- 230000003014 reinforcing effect Effects 0.000 description 1
- 229920006395 saturated elastomer Polymers 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 230000002195 synergetic effect Effects 0.000 description 1
- 238000009283 thermal hydrolysis Methods 0.000 description 1
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
- 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
-
- 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
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- Chemical & Material Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- Hydrology & Water Resources (AREA)
- Engineering & Computer Science (AREA)
- Environmental & Geological Engineering (AREA)
- Water Supply & Treatment (AREA)
- Organic Chemistry (AREA)
- Chemical Kinetics & Catalysis (AREA)
- General Chemical & Material Sciences (AREA)
- Treatment Of Sludge (AREA)
Abstract
The invention relates to an integrated sludge reduction machine and a treatment system for treating biochemical sludge by combining hydrodynamic cavitation with micro alkali. The invention mainly solves the technical problems of short effective cavitation flow time of liquid, insufficient cracking effect on larger sludge flocs and high energy consumption of the existing hydrodynamic cavitation mud-reducing equipment. The technical scheme of the invention is as follows: the utility model provides an integration subtracts mud machine, it includes dive motor, intake pipe, frame, aeration tube, (mixing) shaft, cavitation spoiler, wear-resisting axle sleeve, spiral stirring impeller and throw alkali pipe, dive motor establishes the top at the frame, the upper end and the frame bottom surface of aeration tube are connected, the lower part in the aeration tube inner chamber is established to the cavitation spoiler, the one end and the dive motor pivot of (mixing) shaft are connected, the other end and the spiral stirring impeller hookup of (mixing) shaft, the wear-resisting axle sleeve is established in cavitation spoiler central shaft hole, the intake pipe is connected with the air inlet on aeration tube upper portion, throw alkali pipe and establish on the outer wall of aeration tube.
Description
Technical Field
The invention relates to an integrated sludge reduction machine and a treatment system for treating biochemical sludge by combining hydrodynamic cavitation with micro alkali, and belongs to the technical field of sewage treatment.
Background
The sludge reduction technology is to reduce the quality of the discharged biological sludge of the biological treatment by proper measures on the premise of ensuring the sewage treatment effect. Is a better method for solving the problem of sludge outlet. The currently applied sludge reduction technology mainly comprises a mechanical method, a chemical method, a biological method and the like. Chemical methods include oxidation with ozone, acid-base or thermal hydrolysis. The microbial cells are crushed by technical means such as ultrasonic waves, hydrodynamic cavitation and the like, so that intracellular organic matters can be released and dissolved out and returned to a biochemical treatment system, and the purpose of recycling and reducing the residual sludge is achieved.
Chinese patent ZL201310378632.7 discloses a method for reinforcing sludge reduction by adopting supercritical dissolved air cavitation equipment, which comprises the steps of enabling a sludge mixed solution to pass through a cavitation nozzle at high speed through a water pump, generating cavitation effect through pipeline contraction and diffusion, and finally discharging sludge subjected to dissolved air cavitation treatment from a sludge output pipe. The following disadvantages exist in the use process: the pressure generated by the sludge mixed liquid through the non-blocking sewage pump passes through the equipment at one time, so that the cavitation flow time of the liquid is short; the two cavitation is insufficient for cracking larger sludge flocs and other organic matters.
Chinese patent CN201510738373.3 discloses a hydrodynamic cavitation mud-reducing machine and a sewage treatment method thereof, wherein the hydrodynamic cavitation mud-reducing machine comprises at least two stages of cavitation devices connected in series with each other; the first-stage cavitation device comprises a first cavitation device arranged in the first-stage cavitation cavity and a crushing baffle plate opposite to an outlet of the first cavitation device; the second-stage cavitation device comprises a second cavitation device, a jet flow restriction body and a second-stage diffusion pipe which are sequentially connected, the jet flow restriction body is positioned in a dissolved air cavity, and the dissolved air cavity is provided with a dissolved air adjusting mechanism; the mixed liquid to be treated containing sludge enters the first cavitation device to form high-speed jet flow to impact on the crushing baffle plate, so that large-particle sludge flocs in the mixed liquid are crushed, then the mixed liquid enters the second cavitation device, dissolved air cavitation is generated in the second cavitation device, and the mixed liquid is discharged after being treated by the secondary diffusion pipe. According to the hydrodynamic cavitation mud-reducing machine, the crushing baffle plates are arranged, the cavitation stage number is increased, so that the cracking performance of mud flocs is improved, the pressure requirement is correspondingly improved, and the energy consumption is increased.
Disclosure of Invention
The invention aims to solve the technical problems of short effective liquid cavitation flow time, insufficient cracking effect on larger sludge flocs and other organic matters and high energy consumption of the existing hydrodynamic cavitation sludge reduction equipment, and provides an integrated sludge reduction machine and a treatment system for treating biochemical sludge by hydrodynamic cavitation and micro-alkali.
In order to solve the technical problems, the invention adopts the following technical scheme:
the integrated sludge reducing machine comprises a submersible motor, an air inlet pipe, a machine seat, an aeration cylinder, a stirring shaft, a cavitation flow blocking plate, a wear-resistant shaft sleeve, a spiral stirring impeller and an alkali throwing pipe, wherein the submersible motor is arranged above the machine seat, the upper end of the aeration cylinder is connected with the bottom surface of the machine seat, the cavitation flow blocking plate is arranged at the lower part in the inner cavity of the aeration cylinder, one end of the stirring shaft is connected with a rotating shaft of the submersible motor, the other end of the stirring shaft penetrates through a shaft hole in the center of the cavitation flow blocking plate to be connected with the spiral stirring impeller, the wear-resistant shaft sleeve is arranged in the shaft hole in the center of the cavitation flow blocking plate and is positioned between the shaft hole in the center of the cavitation flow blocking plate and the stirring shaft, the outlet of the air inlet pipe is connected with an air inlet arranged at the upper part of the aeration cylinder, and the alkali throwing pipe is arranged on the outer wall of the aeration cylinder and the alkali throwing outlet is positioned at the outlet at the lower end of the aeration cylinder.
Further, the device also comprises a fixed bracket, wherein the fixed bracket is connected with the upper parts of the air inlet pipe and the alkali throwing pipe.
The integrated sludge reduction machine for treating the biochemical sludge by the hydrodynamic cavitation and the micro-alkali comprises an integrated sludge reduction machine for treating the biochemical sludge by the hydrodynamic cavitation and the micro-alkali, an alkali dissolving tank, a metering pump and a bracket, wherein the integrated sludge reduction machine for treating the biochemical sludge by the hydrodynamic cavitation and the micro-alkali is arranged in a sludge tank through the bracket, and the metering pump is arranged on the alkali dissolving tank and a liquid outlet of the metering pump is connected with an inlet of an alkali throwing pipe.
The beneficial effects of the invention are as follows:
(1) The integrated sludge reduction machine is directly put into an existing sludge concentration tank or digestion tank of a sewage plant for use, does not need to change the original process and pipelines, and is suitable for being used in most sewage treatment plants, in particular to small and medium-sized sewage treatment plants;
(2) The hydraulic cavitation bubble expansion of the invention occurs in the aeration body of the equipment, the cavitation collapse process is realized in the sludge pond, and the design shortens the path of occurrence of the hydraulic cavitation effect, so that the consumed energy mainly acts on the cavitation bubble expansion, correspondingly reduces the equipment investment, reduces the mixed hydraulic pressure requirement and saves the energy consumption;
(3) The invention uses the residual energy generating hydrodynamic cavitation effect as the power for mixing the alkali liquor and the sludge mixed liquor, thereby saving the investment of alkali adding stirring equipment, saving the power consumption of the stirring equipment and achieving a good effect of multiple purposes;
(4) The conventional alkaline hydrolysis process has certain requirement on the alkali addition amount, and trace alkali addition can only destroy the sludge floc structure, but can not destroy the cell structure, so that the increase of soluble organic matters is small, and the purpose of breaking the sludge solid organic matters can not be achieved. The effect of breaking sludge by increasing the alkali addition is good, but the high-concentration sodium potassium ions inhibit the subsequent anaerobic digestion. The invention avoids the extreme conditions generated by hydrodynamic cavitation from directly acting on microbial cells while the sludge floc structure is destroyed by micro alkali addition, furthest plays the role of alkaline hydrolysis, fully utilizes the wall breaking effect of hydrodynamic cavitation on the microorganisms, maximizes the effects of the two, and has obvious interaction promotion effects on cell cracking and organic matter degradation.
Drawings
FIG. 1 is a schematic view of the construction of an integrated mud saver of the present invention;
FIG. 2 is a schematic diagram of the integrated mud saver treatment system of the present invention.
Detailed Description
The invention is described in further detail below with reference to the drawings and examples.
As shown in fig. 1, the integrated sludge reducing machine for treating biochemical sludge by hydrodynamic cavitation and micro-alkali in the embodiment comprises a submersible motor 1, an air inlet pipe 2, a machine base 3, an aeration tank 4, a stirring shaft 5, a cavitation flow blocking plate 7, a wear-resistant shaft sleeve 6, a spiral stirring impeller 8 and an alkali throwing pipe 9, wherein the submersible motor 1 is arranged above the machine base 3, the upper end of the aeration tank 4 is connected with the bottom surface of the machine base 3, the cavitation flow blocking plate 7 is arranged at the lower part in the inner cavity of the aeration tank 3, one end of the stirring shaft 5 is connected with the rotating shaft of the submersible motor 1 through a coupler, the other end of the stirring shaft 5 passes through a shaft hole in the center of the cavitation flow blocking plate 7 and is connected with the spiral stirring impeller 8, the wear-resistant shaft sleeve 6 is arranged in the central shaft hole of the cavitation flow blocking plate 7 and is positioned between the central shaft hole of the cavitation flow blocking plate 7 and the stirring shaft 5, the outlet of the air inlet pipe 2 is connected with an air inlet arranged at the upper part of the aeration tank 4, and the alkali throwing pipe 9 is arranged on the outer wall of the aeration tank 4 and the alkali throwing outlet is positioned at the outlet of the lower end of the aeration tank 4.
Further, it also comprises a fixed bracket 10, and the fixed bracket 10 is connected with the upper parts of the air inlet pipe 2 and the alkali adding pipe 9.
As shown in fig. 2, the treatment system of the integrated sludge reduction machine for treating biochemical sludge by using the hydraulic cavitation and micro-alkali comprises the integrated sludge reduction machine for treating biochemical sludge by using the hydraulic cavitation and micro-alkali, an alkali dissolving tank 12, a metering pump 11 and a bracket 13, wherein the integrated sludge reduction machine for treating biochemical sludge by using the hydraulic cavitation and micro-alkali is arranged in a sludge pond 14 through the bracket 13, the metering pump 11 is arranged on the alkali dissolving tank 12, and a liquid outlet of the metering pump 11 is connected with an inlet of an alkali feeding pipe 9.
The integrated sludge reduction machine for treating biochemical sludge by combining hydrodynamic cavitation with micro-alkali is hung or arranged in an existing sludge concentration tank or a sludge digestion tank of a sewage treatment plant through a bracket 13 in other mounting modes, and the whole equipment is immersed in the sludge mixed solution. The upper end of the alkali adding pipe 9 extends out of the water surface to be connected with a liquid outlet of an alkali adding metering pump 11, and a liquid inlet pipe of the metering pump 11 extends into an alkali dissolving tank 12 to extract alkali liquid. The air inlet pipe 2 extends out of the pool to facilitate air intake.
The working principle of the invention is as follows:
the spiral stirring impeller 8 rotates at a high speed under the drive of the submersible motor 1, so that the sludge mixed liquid in the aeration cylinder 3 rotates downwards at a high speed, the pressure in the aeration cylinder is reduced to form negative pressure, and external air is sucked through the air inlet pipe 2 and is fully mixed with the sludge mixed liquid. The mixed liquor is ejected at a high speed through the conical small holes on the conical porous cavitation flow baffle 7, the pressure is further reduced to the saturated vapor pressure at the temperature, micro vapor nuclei and bubbles in the mixed liquor are fully developed and expanded, and finally when the mixed liquor enters a sludge pond from the aeration cylinder at a high speed, the pressure of the liquid is restored to cause the bursting of the bubbles in the mixed liquor, and cavitation effect occurs to cause the disintegration of organic sludge in the sludge mixed liquor. Meanwhile, the mixed liquid sprayed from the aeration cylinder at high speed carries the alkali liquor which is added simultaneously, and the mixed liquid is stirred and mixed in the sludge pool to realize synergistic effect, so that the capacity of cracking the sludge is further improved.
Example 1
Taking 1m 3 Fresh sludge in a sludge concentration tank of a municipal sewage plant is placed in an experimental open water tank, an integrated sludge reduction machine for treating biochemical sludge by combining hydrodynamic cavitation with micro-alkali, which has cavitation generation power of 200 watts, is fixedly arranged in a sludge mixed liquid in the experimental water tank, and is connected with a power supply controller, so that a liquid outlet pipe of an alkali feeding system is connected with an alkali feeding pipe of the integrated sludge reduction machine for treating biochemical sludge by combining hydrodynamic cavitation with micro-alkali. Starting a power supply to add alkali into the sludge, simultaneously starting hydrodynamic cavitation, controlling the pH value of the sludge to be 9, stopping adding alkali, continuously running the hydrodynamic cavitation for 180 minutes, detecting the change condition of organic matters in the sludge supernatant, wherein the change condition of the organic matters in the sludge supernatant is as shown in table 1, the solubility of the organic matters in the sludge supernatant is increased from less than 100mg/l to 1938.3mg/l in three hours, and the solubility of the organic matters in the sludge is increased from less than 2% to 36.57%. And the whole power is only 200 watts, so that a very high energy efficiency ratio is achieved.
TABLE 1
| pH | TS mg/l | TCOD mg/l | SCOD mg/l | Solubility% | |
| Before treatment | 6.8 | 6800 | 5300 | ﹤100 | ﹤2 |
| Treatment for 30 minutes | 9 | 898.1 | 16.94 | ||
| Treatment for 3 hours | 7.6 | 1938.3 | 36.57 |
Example two
Daily treatment 20000m 3 The method is characterized in that the urban sewage treatment plant generates about 16 tons of filter-pressed sludge with the water content of 85 percent every day, four integrated sludge reducing machines with cavitation power of 1.5 kilowatts are arranged in a sludge concentration tank of the sludge reducing machine for treating biochemical sludge by combining hydrodynamic cavitation with micro-alkali, the two-purpose two-standby operation system continuously works for 16 hours every day, 0.02 kilogram of alkali is added into each kilogram of dry sludge, 50 kilograms of NaOH is added into each kilogram of dry sludge every day, the continuous operation is carried out for three months, and the average daily discharged sludge amount is reduced to be within 3 tons. The outward sludge is reduced from one operation a day to one operation a week, and obvious economic benefit and good social benefit are obtained.
Claims (3)
1. An integrated mud reducing machine for treating biochemical mud by hydrodynamic cavitation cooperated with micro alkali is characterized in that: the device comprises a submersible motor, an air inlet pipe, a machine seat, an aeration pipe, a stirring shaft, a cavitation flow blocking plate, a wear-resisting shaft sleeve, a spiral stirring impeller and an alkali throwing pipe, wherein the submersible motor is arranged on the machine seat, the upper end of the aeration pipe is connected with the bottom surface of the machine seat, the cavitation flow blocking plate is arranged at the lower part in the inner cavity of the aeration pipe, one end of the stirring shaft is connected with the rotating shaft of the submersible motor, the other end of the stirring shaft penetrates through a shaft hole in the center of the cavitation flow blocking plate to be connected with the spiral stirring impeller, the wear-resisting shaft sleeve is arranged in the shaft hole in the center of the cavitation flow blocking plate and is positioned between the shaft hole in the center of the cavitation flow blocking plate and the stirring shaft, the outlet of the air inlet pipe is connected with an air inlet arranged at the upper part of the aeration pipe, and the alkali throwing pipe is arranged on the outer wall of the aeration pipe and the alkali throwing outlet is positioned at the outlet at the lower end of the aeration pipe.
2. The integrated sludge reduction machine for treating biochemical sludge by combining hydrodynamic cavitation with micro-alkali according to claim 1, which is characterized in that: the device also comprises a fixed bracket, wherein the fixed bracket is connected with the upper parts of the air inlet pipe and the alkali throwing pipe.
3. A treatment system of an integrated sludge reduction machine for treating biochemical sludge by using hydrodynamic cavitation in combination with micro-alkali according to claim 1 or 2, characterized in that: the integrated sludge reduction machine for treating the biochemical sludge by the hydrodynamic cavitation and the micro-alkali is arranged in a sludge pond through the bracket, the metering pump is arranged on the alkali dissolution tank, and a liquid outlet of the metering pump is connected with an inlet of an alkali feeding pipe.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810027854.7A CN108002676B (en) | 2018-01-11 | 2018-01-11 | Hydrodynamic cavitation cooperated micro-alkali biochemical sludge treatment integrated sludge reduction machine and treatment system |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810027854.7A CN108002676B (en) | 2018-01-11 | 2018-01-11 | Hydrodynamic cavitation cooperated micro-alkali biochemical sludge treatment integrated sludge reduction machine and treatment system |
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| Publication Number | Publication Date |
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| CN108002676A CN108002676A (en) | 2018-05-08 |
| CN108002676B true CN108002676B (en) | 2023-12-12 |
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Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2004202368A (en) * | 2002-12-25 | 2004-07-22 | Babcock Hitachi Kk | Method and apparatus for treating activated sludge |
| JP2007152268A (en) * | 2005-12-07 | 2007-06-21 | Slim Tecno Kk | Sludge reducing device |
| CN102417233A (en) * | 2011-09-29 | 2012-04-18 | 太原卫安环保科技有限公司 | Hydrodynamic cavitation oxygenation aerator |
| CN104787996A (en) * | 2015-04-17 | 2015-07-22 | 天津大学 | Alkali-ultrasonic synergistic wastewater treatment method and device |
| CN105565620A (en) * | 2014-10-09 | 2016-05-11 | 中国石油化工股份有限公司 | Chemical sludge stabilization method and treatment device |
| CN105585231A (en) * | 2014-11-04 | 2016-05-18 | 中国石油化工股份有限公司 | Sludge reduction method with ultrasonic and alkali treatment |
| CN106630523A (en) * | 2015-11-04 | 2017-05-10 | 东莞源控环保科技有限公司 | Hydrodynamic cavitation sludge reduction machine and wastewater treatment method thereof |
-
2018
- 2018-01-11 CN CN201810027854.7A patent/CN108002676B/en active Active
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2004202368A (en) * | 2002-12-25 | 2004-07-22 | Babcock Hitachi Kk | Method and apparatus for treating activated sludge |
| JP2007152268A (en) * | 2005-12-07 | 2007-06-21 | Slim Tecno Kk | Sludge reducing device |
| CN102417233A (en) * | 2011-09-29 | 2012-04-18 | 太原卫安环保科技有限公司 | Hydrodynamic cavitation oxygenation aerator |
| CN105565620A (en) * | 2014-10-09 | 2016-05-11 | 中国石油化工股份有限公司 | Chemical sludge stabilization method and treatment device |
| CN105585231A (en) * | 2014-11-04 | 2016-05-18 | 中国石油化工股份有限公司 | Sludge reduction method with ultrasonic and alkali treatment |
| CN104787996A (en) * | 2015-04-17 | 2015-07-22 | 天津大学 | Alkali-ultrasonic synergistic wastewater treatment method and device |
| CN106630523A (en) * | 2015-11-04 | 2017-05-10 | 东莞源控环保科技有限公司 | Hydrodynamic cavitation sludge reduction machine and wastewater treatment method thereof |
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