CN112723712A - Method for determining flocculating agent required by waste slurry treatment and optimal addition amount of flocculating agent - Google Patents
Method for determining flocculating agent required by waste slurry treatment and optimal addition amount of flocculating agent Download PDFInfo
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- CN112723712A CN112723712A CN202011382011.2A CN202011382011A CN112723712A CN 112723712 A CN112723712 A CN 112723712A CN 202011382011 A CN202011382011 A CN 202011382011A CN 112723712 A CN112723712 A CN 112723712A
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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
- C02F11/121—Treatment of sludge; Devices therefor by de-watering, drying or thickening by mechanical de-watering
- C02F11/122—Treatment of sludge; Devices therefor by de-watering, drying or thickening by mechanical de-watering using filter presses
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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
- C02F11/148—Combined use of inorganic and organic substances, being added in the same treatment step
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Abstract
The invention relates to the technical field of waste slurry treatment, in particular to a method for determining a flocculating agent required by waste slurry treatment and an optimal addition amount of the flocculating agent. The method comprises the following steps: (1) collecting engineering waste slurry and providing a plurality of flocculating agents; (2) carrying out a flocculation sedimentation test on the engineering waste slurry by adopting a flocculating agent, and analyzing the water quality of the separated slurry water to determine a proper flocculating agent and an optimal addition amount range thereof; (3) and performing a filter pressing test on the flocculated slurry by using a filter pressing device to determine an optimal flocculating agent and an optimal addition amount thereof. Different kinds of flocculating agents are firstly screened, and the flocculating agent which is most suitable for the dewatering effect of the engineering mud is determined from the aspects of economy and the like. Then, a flocculating agent with flocculation dehydration effect, namely useful for the mud is adopted to determine the optimal flocculation through a filter pressing test and the water content of mud cakes. Not only ensures the speed of mud-water separation, but also improves the mechanical dehydration efficiency, saves time and reduces cost.
Description
Technical Field
The invention relates to the technical field of waste slurry treatment, in particular to a method for determining a flocculating agent required by waste slurry treatment and an optimal addition amount of the flocculating agent.
Background
The construction of civil engineering such as high-rise buildings, super high-rise buildings, expressways, large bridges, large tunnels and the like is rapidly developed, and simultaneously, a large amount of waste slurry is inevitably generated in the construction process, wherein the waste slurry is a suspension system consisting of water, bentonite particles, cohesive soil particles and additives, has high water content and is difficult to naturally precipitate and separate. The prior treatment mode is to dewater and reduce the slurry by adding a flocculating agent, then deeply dewater the flocculated slurry by using a belt filter press, a plate and frame filter press or a centrifugal machine and finally transport the slurry outwards. The flocculant destabilizes and aggregates a slurry system to form floccules with larger grain sizes through the actions of potential neutralization, double electric layer compression, adsorption bridging and the like, thereby precipitating quickly, changing the components and grain size distribution of the slurry and having great influence on the dehydration performance of the slurry. At present, most of engineering treatment slurry required flocculants and the addition amount thereof are determined by small test tests: taking a plurality of mud with the same mass, adding different types and different addition amounts of mud-water interface reading, and obtaining the optimal flocculating agent and the optimal addition amount by comparing the mud sedimentation rate. This test mode only takes into account the rapid dewatering reduction and does not take into account the influence of the flocculant on the dewatering performance. In fact, the purpose of dewatering reduction is to serve the following mechanical deep dewatering, so that the prior art cannot ensure that the dewatering performance of the flocculated slurry is good, and in most cases, the mechanical dewatering efficiency is low, the cost is high, and resources are wasted.
Disclosure of Invention
Aiming at the defects in the prior art, the invention provides a method for determining the flocculating agent required by waste engineering slurry treatment and the optimal addition amount thereof, and the flocculating agent and the addition amount are selected by fully combining the sludge-water separation rate and the dewatering performance of the flocculated slurry, so that the sludge-water separation rate is ensured, the mechanical dewatering efficiency is improved, the time is saved, and the cost is reduced.
The technical scheme of the invention is as follows:
the invention explores the flocculation sedimentation rule by the flocculation sedimentation test and the determination of indexes such as turbidity, ss value, Zeta and the like of the supernatant after the flocculation test, screens different kinds of flocculating agents firstly, and determines the flocculating agent which is most suitable for the dewatering effect of the engineering mud from the aspects of economy and the like. Then, a flocculating agent with flocculation dehydration effect, namely useful for the mud is adopted to determine the optimal flocculation through a filter pressing test and the water content of mud cakes. The application focuses on the determination of the properties of the flocculated slurry supernatant to carry out primary screening on the flocculating agent, and the post-filter-pressing experiment is finally preferred.
The invention aims to provide a method for determining a flocculating agent required by waste slurry treatment and an optimal addition amount of the flocculating agent, which comprises the following steps:
(1) collecting engineering waste slurry and providing a plurality of flocculating agents;
(2) carrying out a flocculation sedimentation test on the engineering waste slurry by adopting a flocculating agent, and analyzing the water quality of the separated slurry water to determine a proper flocculating agent and an optimal addition amount range thereof;
(3) and performing a filter pressing test on the flocculated slurry by using a filter pressing device to determine an optimal flocculating agent and an optimal addition amount thereof.
Preferably, the determination criteria of the proper flocculating agent and the optimal addition amount range in the step (2) are as follows: and determining the type and the addition amount of the flocculant corresponding to the fact that the height of the muddy water decomposition surface is less than 300ml and the turbidity of the supernatant is less than 50NTU according to the sedimentation curve diagram and the turbidity change diagram, namely determining the proper flocculant and the optimal addition amount range thereof.
Preferably, the criteria for determining the optimal flocculating agent and the optimal addition amount thereof in the step (3) are as follows: and determining the time and the water content corresponding to the flocculated slurry when the flocculated slurry reaches the filter-pressing stability, and determining the type and the addition amount of the flocculating agent corresponding to the time and the water content when the numerical values of the time and the water content are minimum as the optimal flocculating agent and the optimal addition amount thereof.
Preferably, the flocculating agent comprises PAM, PAC, lime, ferric trichloride and ferrous sulfate. And (4) measuring the property of the supernatant of the flocculated slurry to carry out primary screening on the flocculating agent, and finally optimizing the post-filter-pressing experiment.
Preferably, the flocculation sedimentation test comprises the following steps: uniformly stirring the slurry, placing the slurry in a beaker, stirring the slurry for 3-5min at the rotating speed of 200r/min for 150-.
Preferably, the filter press test comprises the following steps:
1) gravel with the particle size of 2-5mm is filled at the bottom of the organic glass column to serve as a water permeable layer, and the organic glass column is saturated firstly by a counter-pressure saturation method, so that the influence on the measurement of the water filtration amount is avoided;
2) then laying a layer of geotextile as a filter medium on the top, pouring the flocculated slurry into a filter-pressing test device, and sealing the flange;
3) finally, opening an air compressor and a balance device, applying air pressure to the organic glass column, starting a test, and recording the reading of the balance;
4) processing data; in the filter-pressing test, the water yield m of filtered water in the slurry filter-pressing process is recorded by using a data acquisition devicetCalculating the water content omega of each moment in the mud filter-pressing process through the following formula,
in the formula:
ω1-water content (%) of the slurry before filter pressing;
m1-mud sample loading mass (g);
mt-at a certain moment the balance reading (g), i.e. the water yield.
The beneficial effect of the invention is that,
the invention fully combines the mud-water separation rate and the index of the flocculated slurry supernatant to select the useful medicament for pretreating the slurry, thereby ensuring the mud-water separation efficiency, reducing the cost of the medicament and improving the economy; and the filter pressing device is also favorable for obtaining meaningful dehydration performance parameters when the filter pressing test is carried out on the flocculated slurry in the later period, so that the optimal flocculating agent and the optimal addition amount thereof are finally determined, the mechanical dehydration efficiency is improved, and the time is saved.
Drawings
FIG. 1 is a mud settling curve of example 2; in the figure, the left side is a sedimentation curve of organic polymer flocculant slurry, and the right side is a sedimentation curve of inorganic flocculant slurry;
FIG. 2 is a graph showing the turbidity change in example 2, wherein the horizontal broken lines are denoted as the three-level emission standard <50> in < emission standard for pollutants for municipal wastewater treatment plant GB 18918-2002 >; the left side is a curve showing the change of the solid suspension in the supernatant of the organic polymer flocculant slurry, and the right side is a curve showing the change of the solid suspension in the supernatant of the inorganic flocculant slurry;
FIG. 3 is a graph showing the change of the water content of the mud cake with time in example 2;
FIG. 4 is a diagram of a filter press apparatus;
in the figure: 1. a flange plate; 2. compressing air; 3. slurry; 4. geotextile; 5. gravel sand; 6. a balance; 7. and (5) filtering water.
Detailed Description
In order to make those skilled in the art better understand the technical solutions in the present invention, the technical solutions in the embodiments of the present invention will be clearly and completely described below, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Example 1
A method for determining flocculating agent required by waste mud treatment and optimal addition amount of the flocculating agent comprises the following steps:
(1) collecting engineering waste slurry, and providing PAM, PAC, lime, ferric trichloride, ferrous sulfate and other various flocculants;
(2) performing a flocculation sedimentation test on the engineering waste slurry by using a flocculating agent, analyzing the water quality of the separated slurry water, drawing a sedimentation curve chart and a turbidity change chart, and determining the type and the addition amount of the flocculating agent corresponding to the fact that the height of a sludge water decomposition surface is less than 300ml and the turbidity of supernatant is less than 50NTU according to the sedimentation curve chart and the turbidity change chart, namely the appropriate flocculating agent and the optimal addition amount range thereof;
the flocculation sedimentation experiment comprises the following steps: the mud in the mud bucket is uniformly stirred by an electric stirrer, and then a certain amount of mud is taken and placed in a measuring range beaker. Stirring the mixture for 3min at the rotating speed of 200r/min by using a magnetic stirrer, slowly adding a flocculating agent solution with a specific concentration (continuously stirring by using a drainage rod in the adding process) after uniformly stirring, stirring for 1min at the rotating speed of 100r/min by using the stirrer after adding, quickly pouring the mixture into a measuring cylinder after stirring, naturally settling for 30min, finally recording the reading of a muddy water interface, and taking a small amount of supernatant to test the turbidity of the mixture;
(3) performing a filter pressing test on the flocculated slurry by using a filter pressing device to obtain a dehydration performance parameter, drawing a graph of change of the water content of a mud cake along with time, and determining the time and the water content corresponding to the flocculated slurry when the flocculated slurry is stable in filter pressing, wherein the type and the addition amount of the corresponding flocculant are the optimal flocculant and the optimal addition amount thereof when the numerical values of the time and the water content are the minimum;
the filter pressing test comprises the following steps:
1) gravel 5 with the particle size of 2-5mm is filled at the bottom of the organic glass column to serve as a water permeable layer (mainly playing a role in drainage), and is saturated firstly by a counter-pressure saturation method, so that the influence on the measurement of the water filtration amount is avoided;
2) then, a layer of geotextile 4 is laid on the top of the device as a filter medium, the flocculated slurry is slowly poured into the device (shown in figure 4), and the flange plate 1 is sealed;
3) finally, turning on devices such as an air compressor, a balance 6 and the like, applying compressed air 2 with certain pressure to the organic glass column, starting the test, and recording the reading of the balance;
4) data processing: in the filter pressing test, a data acquisition device is used for recording the water yield mt of the filtered water 7 in the slurry filter pressing process; and calculating the water content omega of each moment in the mud filter-pressing process by the following formula:
in the formula:
ω1-water content (%) of the slurry before filter pressing;
m1-mud sample loading mass (g);
mt-at a certain moment the balance reading (g), i.e. the water yield.
Example 2
The slurry for a certain construction site in Nanjing has the following property indexes:
TABLE 1 indexes of properties of waste slurry from construction
The flocculant was selected by the method provided in example 1, with iron chloride (FeCl) first being selected3) Polyaluminium chloride (PAC), cationic polyacrylamide (molecular weight 1200 ten thousand, hereinafter abbreviated as CPAM12), and anionic polyacrylamide (molecular weight 1200 ten thousand, hereinafter abbreviated as APAM12) were found by a flocculation sedimentation test to be suitable flocculants in amounts of 0.8%, 0.3%, and 0.3%, respectively (see fig. 1 and 2). Then, a filter-pressing test is carried out on the slurry flocculated by the three flocculating agents by adopting a filter-pressing device, and the filter-pressing stabilization (the water content does not change along with the time increase) of the slurry flocculated by the polyaluminium chloride, the cationic polyacrylamide and the anionic polyacrylamide takes 45min, 30min and 70min respectively under the pressure of 0.8MPa, and the stabilized slurry has the water content which does not change along with the time increaseThe water content of the mud cake was 31.6%, 27.8% and 28.5%, respectively (see fig. 3). Therefore, cationic polyacrylamide is finally selected as a flocculating agent for treating the waste slurry, and the addition amount is 0.3 percent. And then, the on-site plate-and-frame filter pressing result also shows that the water content of the mud cake generated after being pressed for 35min under the pressure of 0.8MPa is 27.2 percent, so that the filter pressing time is shortened, the cost is saved, and the final water content of the mud cake is reduced compared with the prior art.
Example 3
The waste slurry of a certain construction site in Changzhou has the following property indexes of 2:
TABLE 2 indexes of properties of the waste slurry from construction
The method provided in example 1 is used to select the flocculating agent, and firstly, several flocculating agents, namely ferrous sulfate, polyaluminium chloride, cationic polyacrylamide and anionic polyacrylamide are selected, and the flocculating settling test shows that the polyaluminium chloride, the cationic polyacrylamide and the anionic polyacrylamide are suitable flocculating agents, and the suitable addition amounts are 1.2%, 0.3% and 0.2% respectively. Then, a filter pressing device is adopted to carry out filter pressing tests on the slurry flocculated by the three flocculating agents, and the filter pressing device finds that under the pressure of 1MPa, the time required for the slurry flocculated by the polyaluminium chloride, the cationic polyacrylamide and the anionic polyacrylamide to reach filter pressing stability (the water content does not change along with the increase of time) is 60min, 35min and 55min respectively, and the water content of the stabilized mud cake is 30.4%, 28.4% and 29% respectively. Therefore, anionic polyacrylamide is finally selected as a flocculating agent for treating the waste slurry, and the addition amount is 0.2%. Then, the on-site plate-and-frame filter pressing result also shows that the water content of the mud cake generated after being pressed for 40min under the pressure of 1MPa is 28.8 percent.
Comparative example 1
Compared with the example 2, the test method is different, and the existing small test is adopted for determining, namely, a plurality of portions of slurry with the same mass are taken, different types and different addition amounts of flocculant solutions are added into the slurry, and the readings of the mud-water interface at different moments are recorded. The optimal flocculant is obtained by comparing the sedimentation rate of the slurry, the flocculant selected by the optimal addition amount engineering is anionic polyacrylamide (with the molecular weight of 1200 ten thousand), and the addition amount is 0.4%. And (3) carrying out filter pressing on the flocculated slurry by adopting a plate-and-frame filter press on site, wherein the water content of a mud cake generated by pressing for 50min under the pressure of 1MPa is 30.2%.
Comparative example 2
Compared with the embodiment 2, the test method is different, the existing small test is adopted to determine that the flocculating agent selected by the engineering is polyaluminium chloride, and the addition amount is 1.6%. And (3) carrying out filter pressing on the flocculated slurry by adopting a plate-and-frame filter press, wherein the water content of a mud cake generated by pressing for 65min under the pressure of 1MPa is 31.2%.
As can be seen from comparing example 2 with comparative example 1 and comparing example 3 with comparative example 2, the method provided by example 1 reduces the filter pressing time, saves the cost and reduces the final mud cake water content. The invention fully combines the mud-water separation rate and the index of the flocculated slurry supernatant to select the useful medicament for pretreating the slurry, thereby ensuring the mud-water separation efficiency, reducing the cost of the medicament and improving the economy; and the filter pressing device is also favorable for obtaining meaningful dehydration performance parameters when the filter pressing test is carried out on the flocculated slurry in the later period, so that the optimal flocculating agent and the optimal addition amount thereof are finally determined, the mechanical dehydration efficiency is improved, and the time is saved.
The present invention has been described in detail by way of preferred embodiments, but the present invention is not limited thereto. Various equivalent modifications or substitutions can be made on the embodiments of the present invention by those skilled in the art without departing from the spirit and scope of the present invention, and these modifications or substitutions are within the scope of the present invention/any person skilled in the art can easily conceive of the changes or substitutions within the technical scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.
Claims (8)
1. A method for determining flocculating agent required by waste mud treatment and the optimal addition amount of the flocculating agent is characterized by comprising the following steps:
(1) collecting engineering waste slurry and providing a plurality of flocculating agents;
(2) carrying out a flocculation sedimentation test on the engineering waste slurry by adopting a flocculating agent, and drawing a sedimentation curve diagram and a turbidity change diagram so as to determine a proper flocculating agent and an optimal addition amount range thereof;
(3) and performing a filter pressing test on the flocculated slurry by using a filter pressing device, and drawing a time-dependent change diagram of the water content of the sludge cake so as to determine an optimal flocculating agent and an optimal addition amount thereof.
2. The method for determining the flocculating agent and the optimal adding amount of the flocculating agent required by the waste sludge treatment according to claim 1, wherein the proper flocculating agent and the optimal adding amount range in the step (2) have the following judgment standards: and determining the type and the addition amount of the flocculant corresponding to the fact that the height of the muddy water decomposition surface is less than 300ml and the turbidity of the supernatant is less than 50NTU according to the sedimentation curve diagram and the turbidity change diagram, namely determining the proper flocculant and the optimal addition amount range thereof.
3. The method for determining the flocculating agent and the optimal adding amount thereof required for waste sludge treatment according to claim 1, wherein the criteria for determining the optimal flocculating agent and the optimal adding amount thereof in the step (3) are as follows: and determining the time and the water content corresponding to the flocculated slurry when the flocculated slurry reaches the filter-pressing stability, and determining the type and the addition amount of the flocculating agent corresponding to the time and the water content when the numerical values of the time and the water content are minimum as the optimal flocculating agent and the optimal addition amount thereof.
4. The method of claim 1, wherein the flocculating agent comprises PAM, PAC, lime, ferric chloride, ferrous sulfate.
5. The method of claim 1, wherein the flocculation settling test comprises the steps of: uniformly stirring the slurry, placing the slurry in a beaker, stirring the slurry for 3-5min at the rotating speed of 150-.
6. The method of claim 3, wherein the natural settling time is 30-50 min.
7. The method of claim 1, wherein the filter press test comprises the steps of:
1) gravel is filled at the bottom of the organic glass column to serve as a water permeable layer, and the organic glass column is saturated firstly by a counter-pressure saturation method, so that the influence on the measurement of the water filtration amount is avoided;
2) then laying a layer of geotextile as a filter medium on the top of the filter disc, pouring the flocculated slurry into a filter pressing device, and sealing the flange disc;
3) opening an air compressor and a balance device, applying air pressure to the organic glass column, starting a test, and recording the reading of the balance;
4) processing data; in the filter-pressing test, the water yield m of filtered water in the slurry filter-pressing process is recorded by using a data acquisition devicetCalculating the water content omega of each moment in the mud filter-pressing process through the following formula,
in the formula:
ω1-water content (%) of the slurry before filter pressing;
m1-mud sample loading mass (g);
mt-at a certain moment the balance reading (g), i.e. the water yield.
8. A method for determining the optimum amount of flocculant and its addition for the treatment of waste sludge as claimed in claim 5 in which the grit is in the range of 2 to 5 mm.
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN113443812A (en) * | 2021-08-03 | 2021-09-28 | 江南大学 | Method for quickly adjusting flocculation condition and filter-pressing dehydration process of blue algae mud |
| CN114942316A (en) * | 2022-05-30 | 2022-08-26 | 中铁工程服务有限公司 | Detection method for recycling of muck |
| CN117217567A (en) * | 2023-07-11 | 2023-12-12 | 中交（天津）生态环保设计研究院有限公司 | Method for screening conditioner for belt press filtration based on uniform test design |
| CN114942316B (en) * | 2022-05-30 | 2024-06-11 | 中铁工程服务有限公司 | Slag soil recycling detection method |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113443812A (en) * | 2021-08-03 | 2021-09-28 | 江南大学 | Method for quickly adjusting flocculation condition and filter-pressing dehydration process of blue algae mud |
| CN113443812B (en) * | 2021-08-03 | 2022-07-22 | 江南大学 | Method for quickly adjusting flocculation condition and filter-pressing dehydration process of blue algae mud |
| CN114942316A (en) * | 2022-05-30 | 2022-08-26 | 中铁工程服务有限公司 | Detection method for recycling of muck |
| CN114942316B (en) * | 2022-05-30 | 2024-06-11 | 中铁工程服务有限公司 | Slag soil recycling detection method |
| CN117217567A (en) * | 2023-07-11 | 2023-12-12 | 中交（天津）生态环保设计研究院有限公司 | Method for screening conditioner for belt press filtration based on uniform test design |
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