CN112774657A - Catalyst for activated sludge deodorization and method for deodorizing activated sludge and accelerating sludge precipitation - Google Patents
Catalyst for activated sludge deodorization and method for deodorizing activated sludge and accelerating sludge precipitation Download PDFInfo
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- CN112774657A CN112774657A CN202011574755.4A CN202011574755A CN112774657A CN 112774657 A CN112774657 A CN 112774657A CN 202011574755 A CN202011574755 A CN 202011574755A CN 112774657 A CN112774657 A CN 112774657A
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- sludge
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- activated sludge
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
- B01J23/00—Catalysts comprising metals or metal oxides or hydroxides, not provided for in group B01J21/00
- B01J23/02—Catalysts comprising metals or metal oxides or hydroxides, not provided for in group B01J21/00 of the alkali- or alkaline earth metals or beryllium
- B01J23/04—Alkali metals
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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
- C02F11/06—Treatment of sludge; Devices therefor by oxidation
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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
- C02F2303/00—Specific treatment goals
- C02F2303/02—Odour removal or prevention of malodour
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- 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
- Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
- Y02A50/00—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE in human health protection, e.g. against extreme weather
- Y02A50/20—Air quality improvement or preservation, e.g. vehicle emission control or emission reduction by using catalytic converters
Abstract
The invention provides a catalyst for activated sludge deodorization and a method for deodorizing activated sludge and accelerating sludge precipitation; the catalyst is a powdery catalyst, and the powdery catalyst comprises the following components in parts by weight: carbon powder, graphite powder, water, ash, sodium hydroxide and a mixed solvent. A method for deodorizing activated sludge in a sewage station sedimentation tank and accelerating sludge sedimentation, (1) adding a powdery catalyst into the sludge, and uniformly stirring by using a mechanical stirrer; (2) 7.5 percent of hydrogen peroxide is dripped, and the concentration of the hydrogen peroxide in the pool is adjusted to 0.05 to 0.1 percent; then closing the mechanical stirrer, and uniformly mixing hydrogen peroxide by using the existing vortex in the tank body; (3) dropwise adding a sodium hydroxide solution, and adjusting the pH value of the acid-base environment in the pool body to 8-9; (4) the sludge is adhered to the surface by the catalyst, the sludge is precipitated, and the agglomerated sludge is precipitated and enters the bottom of the tank body; (5) separating the supernatant liquid and the sludge at the bottom in the tank body, and feeding the sludge into a filter pressing working section.
Description
Technical Field
The invention relates to the technical field of activated sludge treatment, in particular to a catalyst for activated sludge deodorization and a method for deodorizing activated sludge and accelerating sludge precipitation.
Background
In the process of purifying wastewater in a sewage station, the tail end wastewater usually uses an activated sludge process, the activated sludge can generate foul smell in the process of purifying water quality, and the subsequent sludge needs to be precipitated for a long time. At present, a catalyst and an oxidant are added into the sedimentation tank, and the residual sludge body is directly deodorized, so that the sludge sedimentation time is shortened.
The biochemical sludge has the following characteristics:
the color is yellow brown or dark brown;
secondly, the smell is unpleasant, and besides the earthy smell, the odor can be generated continuously and is accompanied with the odor generated by natural metabolism of strains such as mercaptan, thioether, hydrogen sulfide, ammonia gas and the like;
activated strains in the sludge have long survival time, the dried sludge cannot completely kill all the strains, and the living strains can continuously metabolize peculiar smell;
fourthly, the amount of return sludge in the sludge return section is limited, and peculiar smell is more obviously diffused in the return process;
the conventional sedimentation tank has long sedimentation period, the sludge after sedimentation has high water content and wide peculiar smell diffusion, and the peculiar smell stays for a long time;
sixthly, the tank body tail gas collection quantity with sludge is large, and peculiar smell is difficult to collect completely due to the difference of sludge living environments in different sections;
the peculiar smell diffusion phenomenon exists in the plate frame filter-pressing sludge, and the peculiar smell between the plate frames is difficult to be completely collected and is inconvenient for people to enter and exit and operate;
the characteristics can be seen as follows: the source reduction, the effective collection and the end treatment are important steps for deodorizing sludge in a sewage station.
The existing similar deodorization technology is completed through the oxidability of sodium hypochlorite, but the deodorization of the sodium hypochlorite has a plurality of disadvantages: if the amount of sodium hypochlorite is too large, the concentration of chloride ions in a circulating water system is increased, and the corrosion inhibition of water quality is possibly adversely affected
② free chloride ions released from sodium chlorate will cause poisoning.
Thirdly, the medicine is corrosive, can cause burn of human bodies and has sensitization.
Fourthly, the product is not easy to store and should be preserved in a sealed glass jar and placed in a dark and cool place
Fifthly, the excessive concentration of chloride ions in the waste mud can cause secondary pollution.
Disclosure of Invention
In order to overcome the problems in the prior art, accelerate the decomposition of harmful substances in water, accelerate sludge sedimentation and greatly shorten the retention time of sewage, the invention provides a catalyst for activated sludge deodorization and a method for deodorizing activated sludge and accelerating sludge sedimentation.
The technical scheme adopted by the invention is as follows: the catalyst for deodorizing the activated sludge has the innovation points that: the catalyst is in a powder form and comprises the following components in parts by weight: 45-50 wt% of carbon powder, 20-25 wt% of graphite powder, 2-10 wt% of water, 1-5 wt% of ash, 2-5 wt% of sodium hydroxide and 5-25 wt% of mixed solvent.
On the basis, the paint comprises the following components in parts by weight: 48 wt% of carbon powder, 22 wt/percent of graphite powder, 5 wt% of water, 5 wt% of ash, 5 wt% of sodium hydroxide and 15 wt% of mixed solvent.
On the basis, the mixed solvent comprises 10 wt% of acetone and 20 wt% of phosphoric acid, and the balance is water.
On this basis, the sodium hydroxide is a sodium hydroxide solution with PH = 9.
On the basis, the hydrogen peroxide is also included, and the hydrogen peroxide is hydrogen peroxide with the concentration of 7.5%.
The invention also aims to provide a method for deodorizing the activated sludge in the sewage station sedimentation tank and accelerating the sludge sedimentation by using the catalyst for deodorizing the activated sludge, which has the innovation points that: the method specifically comprises the following steps:
(1) adding a powdery catalyst into the sludge, and uniformly stirring by using a mechanical stirrer;
(2) 7.5 percent of hydrogen peroxide is dripped, and the concentration of the hydrogen peroxide in the pool is adjusted to 0.05 to 0.1 percent; then closing the mechanical stirrer, and uniformly mixing hydrogen peroxide by using the existing vortex in the tank body;
(3) dropwise adding a sodium hydroxide solution to adjust the acid-base environment in the tank body to be alkalescent;
(4) the sludge is adhered to the surface by the catalyst, the sludge is precipitated, and the agglomerated sludge is precipitated and enters the bottom of the tank body;
(5) separating the supernatant liquid and the sludge at the bottom in the tank body, and feeding the sludge into a filter pressing working section.
On the basis, the adding proportion of the sludge and the catalyst in the step (1) is that the sludge: catalyst = 20-50: 1 weight ratio.
On this basis, the weak alkaline PH in step (3) = 8.
Compared with the prior art, the invention has the beneficial effects that: the invention overcomes the defects of the existing sodium hypochlorite deodorization technology, and provides an activated sludge deodorization and sludge sedimentation acceleration process, aiming at the existing peculiar smell removal technology, and then the invention directly removes the peculiar smell of the residual activated sludge in a targeted manner, so that the peculiar smell diffusion and the retention are avoided from the source, the sludge sedimentation time is shortened, the peculiar smell of a sewage station is reduced, and the sludge sedimentation efficiency is improved. Simple flow and convenient operation.
Detailed Description
The present invention will be described in further detail with reference to examples. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
The invention discloses a catalyst for activated sludge deodorization, which has the innovation points that: the catalyst is in a powder form and comprises the following components in parts by weight: 45-50 wt% of carbon powder, 20-25 wt% of graphite powder, 2-10 wt% of water, 1-5 wt% of ash, 2-5 wt% of sodium hydroxide and 5-25 wt% of mixed solvent.
As further preferred, in the present invention, a preferred formulation of the catalyst for deodorization of activated sludge is: comprises the following components in parts by weight: 48 wt% of carbon powder, 22 wt/percent of graphite powder, 5 wt% of water, 5 wt% of ash, 5 wt% of sodium hydroxide and 15 wt% of mixed solvent. Specifically, the mixed solvent comprises 10 wt% of acetone, 20 wt% of phosphoric acid and the balance of water.
Further preferably, in the present invention, the sodium hydroxide is a sodium hydroxide solution having PH = 9.
More preferably, the hydrogen peroxide treatment device further comprises hydrogen peroxide, wherein the hydrogen peroxide is 7.5% hydrogen peroxide, and the hydrogen peroxide concentration in the pool is adjusted to be 0.05-0.1% by adding amount of the hydrogen peroxide.
The catalyst of the invention can accelerate the decomposition of harmful substances in water, accelerate the sludge sedimentation and greatly shorten the retention time of sewage. The invention also aims to provide a method for deodorizing activated sludge and accelerating sludge sedimentation in a sewage station sedimentation tank by using the catalyst for deodorizing activated sludge, which comprises the following steps:
(1) adding a powdery catalyst into the sludge, and uniformly stirring by using a mechanical stirrer;
(2) 7.5 percent of hydrogen peroxide is dripped, and the concentration of the hydrogen peroxide in the pool is adjusted to 0.05 to 0.1 percent; then closing the mechanical stirrer, and uniformly mixing hydrogen peroxide by using the existing vortex in the tank body;
(3) dropwise adding a sodium hydroxide solution to adjust the acid-base environment in the tank body to be alkalescent;
(4) the sludge is adhered to the surface by the catalyst, the sludge is precipitated, and the agglomerated sludge is precipitated and enters the bottom of the tank body;
(5) separating the supernatant liquid and the sludge at the bottom in the tank body, and feeding the sludge into a filter pressing working section.
As a further preference, in this embodiment of the present invention, the addition ratio of the sludge to the catalyst in the step (1) is sludge: catalyst = 20-50: 1 weight ratio.
As a further preference, in this embodiment of the invention, the weakly basic PH =8 in step (3). The process can reduce the final sludge yield, thereby reducing the filter pressing times of the filter press and further reducing the operation cost.
The following is an example of the effect of removing sludge odor by the catalyst of the present invention.
Example 1
Firstly, sludge with odor concentration grade of four to five grades is obtained by adding the following components in a catalyst: sludge: pure water is 1: 30: 150, mixing 0.05 percent hydrogen peroxide, stirring, and keeping for 20min, wherein the odor concentration grade after treatment can be reduced to below three grades.
The powdery catalyst comprises the following components in parts by weight: 45 wt% of carbon powder, 25 wt/percent of graphite powder, 10 wt% of water, 5 wt% of ash, 5 wt% of sodium hydroxide and 10 wt% of mixed solvent.
The mixed solvent comprises 10 wt% of acetone, 20 wt% of phosphoric acid and the balance of water.
The sodium hydroxide is a sodium hydroxide solution with PH = 9.
The method for deodorizing the activated sludge and accelerating the sludge precipitation of the sewage station sedimentation tank specifically comprises the following steps:
(1) adding a powdery catalyst into the sludge, and uniformly stirring by using a mechanical stirrer;
(2) 7.5 percent of hydrogen peroxide is dripped, and the concentration of the hydrogen peroxide in the pool is adjusted to 0.05 to 0.1 percent; then closing the mechanical stirrer, and uniformly mixing hydrogen peroxide by using the existing vortex in the tank body;
(3) dropwise adding a sodium hydroxide solution, and adjusting the acid-base environment in the pool body to be alkalescent (PH = 8);
(4) the sludge is adhered to the surface by the catalyst, the sludge is precipitated, and the agglomerated sludge is precipitated and enters the bottom of the tank body;
(5) separating the supernatant liquid and the sludge at the bottom in the tank body, and feeding the sludge into a filter pressing working section.
The activated sludge deodorization and sludge precipitation acceleration process provided by the invention aims at the existing peculiar smell removal technology, and then aims at directly removing the peculiar smell of the residual activated sludge, so that the peculiar smell is prevented from diffusing and staying from the source, the sludge precipitation time is shortened, the peculiar smell of a sewage station is reduced, and the sludge precipitation efficiency is improved. Simple flow and convenient operation.
Example 2
Secondly, sludge with odor concentration grade of four to five grades is treated in the presence of a catalyst: sludge: pure water is 1: 40: under the mixture ratio of 200, 0.05 percent hydrogen peroxide is mixed, the mixture is stirred, the retention time is 20min, and the odor concentration grade after treatment can be reduced to be below the second grade.
The powdery catalyst comprises the following components in parts by weight: 50 wt% of carbon powder, 25 wt/percent of graphite powder, 10 wt% of water, 5 wt% of ash, 5 wt% of sodium hydroxide and 5 wt% of mixed solvent.
The mixed solvent comprises 10 wt% of acetone, 20 wt% of phosphoric acid and the balance of water.
The sodium hydroxide is a sodium hydroxide solution with PH = 9.
The method for deodorizing the activated sludge and accelerating the sludge precipitation of the sewage station sedimentation tank specifically comprises the following steps:
(1) adding a powdery catalyst into the sludge, and uniformly stirring by using a mechanical stirrer;
(2) 7.5 percent of hydrogen peroxide is dripped, and the concentration of the hydrogen peroxide in the pool is adjusted to 0.05 percent; then closing the mechanical stirrer, and uniformly mixing hydrogen peroxide by using the existing vortex in the tank body;
(3) dropwise adding a sodium hydroxide solution, and adjusting the acid-base environment in the pool body to be alkalescent (PH = 8);
(4) the sludge is adhered to the surface by the catalyst, the sludge is precipitated, and the agglomerated sludge is precipitated and enters the bottom of the tank body;
(5) separating the supernatant liquid and the sludge at the bottom in the tank body, and feeding the sludge into a filter pressing working section.
Example 3
Thirdly, sludge with odor concentration grade of four to five grades is obtained in the presence of a catalyst: sludge: pure water is 1: 40: under the mixture ratio of 200, 0.1 percent hydrogen peroxide is mixed, the stirring is carried out, the retention time is 20min, and the odor concentration grade after the treatment can be reduced to one grade.
The powdery catalyst comprises the following components in parts by weight: 48 wt% of carbon powder, 22 wt/percent of graphite powder, 8 wt% of water, 2 wt% of ash, 5 wt% of sodium hydroxide and 15 wt% of mixed solvent.
The mixed solvent comprises 10 wt% of acetone, 20 wt% of phosphoric acid and the balance of water.
The sodium hydroxide is a sodium hydroxide solution with PH = 9.
The method for deodorizing the activated sludge and accelerating the sludge precipitation of the sewage station sedimentation tank specifically comprises the following steps:
(1) adding a powdery catalyst into the sludge, and uniformly stirring by using a mechanical stirrer;
(2) 7.5 percent of hydrogen peroxide is dripped, and the concentration of the hydrogen peroxide in the pool is adjusted to 0.1 percent; then closing the mechanical stirrer, and uniformly mixing hydrogen peroxide by using the existing vortex in the tank body;
(3) dropwise adding a sodium hydroxide solution, and adjusting the acid-base environment in the pool body to be alkalescent (PH = 8);
(4) the sludge is adhered to the surface by the catalyst, the sludge is precipitated, and the agglomerated sludge is precipitated and enters the bottom of the tank body;
(5) separating the supernatant liquid and the sludge at the bottom in the tank body, and feeding the sludge into a filter pressing working section.
Example 4
Fourthly, sludge with odor concentration grade of four to five is added into the catalyst: sludge: pure water is 1: 50: 250, mixing 0.05 percent hydrogen peroxide, stirring, and staying for 20min, wherein the odor concentration grade after treatment can be reduced to one grade.
The powdery catalyst comprises the following components in parts by weight: 50 wt% of carbon powder, 20 wt/percent of graphite powder, 10 wt% of water, 1 wt% of ash, 5 wt% of sodium hydroxide and 14 wt% of mixed solvent.
The mixed solvent comprises 10 wt% of acetone, 20 wt% of phosphoric acid and the balance of water.
The sodium hydroxide is a sodium hydroxide solution with PH = 9.
The method for deodorizing the activated sludge and accelerating the sludge precipitation of the sewage station sedimentation tank specifically comprises the following steps:
(1) adding a powdery catalyst into the sludge, and uniformly stirring by using a mechanical stirrer;
(2) 7.5 percent of hydrogen peroxide is dripped, and the concentration of the hydrogen peroxide in the pool is adjusted to 0.05 percent; then closing the mechanical stirrer, and uniformly mixing hydrogen peroxide by using the existing vortex in the tank body;
(3) dropwise adding a sodium hydroxide solution, and adjusting the acid-base environment in the pool body to be alkalescent (PH = 8);
(4) the sludge is adhered to the surface by the catalyst, the sludge is precipitated, and the agglomerated sludge is precipitated and enters the bottom of the tank body;
(5) separating the supernatant liquid and the sludge at the bottom in the tank body, and feeding the sludge into a filter pressing working section.
Example 5
Sludge with odor concentration grade of four to five grades is obtained by adding the following components in a catalyst: sludge: pure water is 1: 20: 100, mixing 0.05 percent hydrogen peroxide, stirring, and staying for 20min, wherein the odor concentration grade after treatment can be reduced to below three grades.
The powdery catalyst comprises the following components in parts by weight: 46 wt% of carbon powder, 24 wt/percent of graphite powder, 3 wt% of water, 5 wt% of ash, 5 wt% of sodium hydroxide and 16 wt% of mixed solvent.
The mixed solvent comprises 10 wt% of acetone, 20 wt% of phosphoric acid and the balance of water.
The sodium hydroxide is a sodium hydroxide solution with PH = 9.
The method for deodorizing the activated sludge and accelerating the sludge precipitation of the sewage station sedimentation tank specifically comprises the following steps:
(1) adding a powdery catalyst into the sludge, and uniformly stirring by using a mechanical stirrer;
(2) 7.5 percent of hydrogen peroxide is dripped, and the concentration of the hydrogen peroxide in the pool is adjusted to 0.05 percent; then closing the mechanical stirrer, and uniformly mixing hydrogen peroxide by using the existing vortex in the tank body;
(3) dropwise adding a sodium hydroxide solution, and adjusting the acid-base environment in the pool body to be alkalescent (PH = 8);
(4) the sludge is adhered to the surface by the catalyst, the sludge is precipitated, and the agglomerated sludge is precipitated and enters the bottom of the tank body;
(5) separating the supernatant liquid and the sludge at the bottom in the tank body, and feeding the sludge into a filter pressing working section.
As can be seen from the above embodiments, the conclusion is drawn in connection with the operating costs: the mixture ratio is as follows: sludge: 1, pure water: 50: the effect is best at 250 days.
The activated sludge deodorization and sludge precipitation acceleration process provided by the invention aims at the existing peculiar smell removal technology, and then aims at directly removing the peculiar smell of the residual activated sludge, so that the peculiar smell is prevented from diffusing and staying from the source, the sludge precipitation time is shortened, the peculiar smell of a sewage station is reduced, and the sludge precipitation efficiency is improved. Simple flow and convenient operation. The odor generated by the sludge in the sewage treatment process is promoted to reach the standard; and the process is added in the sewage treatment, so that the decomposition of harmful substances in water can be accelerated, the sludge sedimentation is accelerated, and the retention time of sewage is greatly shortened. And the process is added in the sewage treatment, so that the final sludge yield can be reduced, the filter pressing times of the filter press are reduced, and the operation cost is further reduced.
While the foregoing description shows and describes the preferred embodiments of the present invention, it is to be understood that the invention is not limited to the forms disclosed herein, but is not to be construed as excluding other embodiments and is capable of use in various other combinations, modifications, and environments and is capable of changes within the scope of the inventive concept as described herein, commensurate with the above teachings, or the skill or knowledge of the relevant art. And that modifications and variations may be effected by those skilled in the art without departing from the spirit and scope of the invention as defined by the appended claims.
Claims (8)
1. A catalyst for deodorizing activated sludge, characterized in that: the catalyst is in a powder form and comprises the following components in parts by weight: 45-50 wt% of carbon powder, 20-25 wt% of graphite powder, 2-10 wt% of water, 1-5 wt% of ash, 2-5 wt% of sodium hydroxide and 5-25 wt% of mixed solvent.
2. The catalyst for deodorizing activated sludge according to claim 1, characterized in that: comprises the following components in parts by weight: 48 wt% of carbon powder, 22 wt% of graphite powder, 5 wt% of water, 5 wt% of ash, 5 wt% of sodium hydroxide and 15 wt% of mixed solvent.
3. The catalyst for deodorizing activated sludge according to claim 2, characterized in that: the mixed solvent comprises 10 wt% of acetone, 20 wt% of phosphoric acid and the balance of water.
4. The catalyst for deodorizing activated sludge according to claim 2, characterized in that: the sodium hydroxide is a sodium hydroxide solution with pH = 9.
5. The catalyst for deodorizing activated sludge according to claim 1, characterized in that: the hydrogen peroxide is 7.5 percent.
6. A method for deodorizing activated sludge in a sewage-station sedimentation tank and accelerating sludge sedimentation by using the catalyst for deodorizing activated sludge according to claim 1, characterized by comprising: the method specifically comprises the following steps:
(1) adding a powdery catalyst into the sludge, and uniformly stirring by using a mechanical stirrer;
(2) 7.5 percent of hydrogen peroxide is dripped, and the concentration of the hydrogen peroxide in the pool is adjusted to 0.05 to 0.1 percent; then closing the mechanical stirrer, and uniformly mixing hydrogen peroxide by using the existing vortex in the tank body;
(3) dropwise adding a sodium hydroxide solution to adjust the acid-base environment in the tank body to be alkalescent;
(4) the sludge is adhered to the surface by the catalyst, the sludge is precipitated, and the agglomerated sludge is precipitated and enters the bottom of the tank body;
(5) separating the supernatant liquid and the sludge at the bottom in the tank body, and feeding the sludge into a filter pressing working section.
7. The method for deodorizing and accelerating sludge precipitation by activated sludge in a sewage station precipitation tank according to claim 6, wherein: the adding proportion of the sludge and the catalyst in the step (1) is that the sludge: catalyst = 20-50: 1 weight ratio.
8. The method for deodorizing and accelerating sludge precipitation by activated sludge in a sewage station precipitation tank according to claim 7, wherein: the weak alkaline PH in step (3) = 8.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113402152A (en) * | 2021-06-22 | 2021-09-17 | 南京宁联环保科技有限公司 | Oil sludge drying agent and oil sludge drying process |
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| JP2001096300A (en) * | 1999-09-30 | 2001-04-10 | Ebara Jitsugyo Co Ltd | Deodorization or odor removal method of organic wastewater sludge |
| CN102358679A (en) * | 2011-09-20 | 2012-02-22 | 同济大学 | Sludge conditioner, and deep dehydration method by using the same |
| CN102992567A (en) * | 2012-12-21 | 2013-03-27 | 湖南清和污泥资源利用有限公司 | Method for disposing sludge |
| CN105060547A (en) * | 2015-07-23 | 2015-11-18 | 百川化工(如皋)有限公司 | Pretreatment process for toluene-contained wastewater |
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2020
- 2020-12-28 CN CN202011574755.4A patent/CN112774657B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2001096300A (en) * | 1999-09-30 | 2001-04-10 | Ebara Jitsugyo Co Ltd | Deodorization or odor removal method of organic wastewater sludge |
| CN102358679A (en) * | 2011-09-20 | 2012-02-22 | 同济大学 | Sludge conditioner, and deep dehydration method by using the same |
| CN102992567A (en) * | 2012-12-21 | 2013-03-27 | 湖南清和污泥资源利用有限公司 | Method for disposing sludge |
| CN105060547A (en) * | 2015-07-23 | 2015-11-18 | 百川化工(如皋)有限公司 | Pretreatment process for toluene-contained wastewater |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN113402152A (en) * | 2021-06-22 | 2021-09-17 | 南京宁联环保科技有限公司 | Oil sludge drying agent and oil sludge drying process |
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