CN109912174B - Wall-breaking deep dehydration treatment method for residual activated sludge - Google Patents
Wall-breaking deep dehydration treatment method for residual activated sludge Download PDFInfo
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- CZMRCDWAGMRECN-UGDNZRGBSA-N Sucrose Chemical compound O[C@H]1[C@H](O)[C@@H](CO)O[C@@]1(CO)O[C@@H]1[C@H](O)[C@@H](O)[C@H](O)[C@@H](CO)O1 CZMRCDWAGMRECN-UGDNZRGBSA-N 0.000 claims description 8
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- 239000005720 sucrose Substances 0.000 claims description 8
- WKDDRNSBRWANNC-UHFFFAOYSA-N Thienamycin Natural products C1C(SCCN)=C(C(O)=O)N2C(=O)C(C(O)C)C21 WKDDRNSBRWANNC-UHFFFAOYSA-N 0.000 claims description 7
- 239000005457 ice water Substances 0.000 claims description 7
- ZSKVGTPCRGIANV-ZXFLCMHBSA-N imipenem Chemical compound C1C(SCC\N=C\N)=C(C(O)=O)N2C(=O)[C@H]([C@H](O)C)[C@H]21 ZSKVGTPCRGIANV-ZXFLCMHBSA-N 0.000 claims description 7
- 229960002182 imipenem Drugs 0.000 claims description 7
- DMJNNHOOLUXYBV-PQTSNVLCSA-N meropenem Chemical compound C=1([C@H](C)[C@@H]2[C@H](C(N2C=1C(O)=O)=O)[C@H](O)C)S[C@@H]1CN[C@H](C(=O)N(C)C)C1 DMJNNHOOLUXYBV-PQTSNVLCSA-N 0.000 claims description 7
- 229960002260 meropenem Drugs 0.000 claims description 7
- TYMABNNERDVXID-DLYFRVTGSA-N Panipenem Chemical compound C([C@@H]1[C@H](C(N1C=1C(O)=O)=O)[C@H](O)C)C=1S[C@H]1CCN(C(C)=N)C1 TYMABNNERDVXID-DLYFRVTGSA-N 0.000 claims description 5
- 238000002156 mixing Methods 0.000 claims description 5
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- 238000006243 chemical reaction Methods 0.000 claims description 4
- OSVXSBDYLRYLIG-UHFFFAOYSA-N dioxidochlorine(.) Chemical compound O=Cl=O OSVXSBDYLRYLIG-UHFFFAOYSA-N 0.000 claims description 4
- ZKQDCIXGCQPQNV-UHFFFAOYSA-N Calcium hypochlorite Chemical compound [Ca+2].Cl[O-].Cl[O-] ZKQDCIXGCQPQNV-UHFFFAOYSA-N 0.000 claims description 2
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- 238000003672 processing method Methods 0.000 claims 8
- 229910021578 Iron(III) chloride Inorganic materials 0.000 claims 1
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- Treatment Of Sludge (AREA)
Abstract
The invention discloses a wall-breaking deep dehydration treatment method for excess sludge, which comprises the steps of firstly feeding excess activated sludge into a wall-breaking homogenizing tank, then adding a treating agent into the homogenizing tank, carrying out osmotic pressure impact wall breaking on the treated sludge, introducing the sludge after wall breaking into a feeding tank of a magnetic separator, adding a water treating agent, an auxiliary agent and magnetic powder into the sludge, carrying out magnetic separation after reacting for a period of time, carrying out solid-liquid separation and simultaneously treating sewage, directly discharging or circulating the water obtained by separation, recovering the magnetic powder from the obtained solid, and then further carrying out dehydration treatment, wherein the water content of the sludge after dehydration is less than or equal to 45%, and the sludge can be used as a further resource raw material.
Description
Technical Field
The invention relates to a method for treating excess sludge, in particular to a method for wall-breaking deep dehydration of excess sludge.
Background
The treatment of excess sludge has become a limiting factor in the popularization and operation of sewage biological treatment technology. The main principle for solving the problems of treatment and disposal of excess sludge is sludge reduction, which comprises sludge reduction and volume reduction, namely sludge production and sludge volume reduction. The traditional sludge treatment mainly adopts methods of concentration, dehydration, drying and the like to reduce the water content of the sludge so as to facilitate subsequent treatment and disposal. However, the method generally has the problems of low treatment efficiency, high medicament cost and the like.
The main reason affecting the sludge dewatering efficiency is the limitation of water in the sludge Extracellular Polymeric Substance (EPS) and intracellular moisture. Deep sludge dewatering refers to conditioning sludge, destroying outer polymer and cell walls of the sludge, releasing bound water, adsorbing water and intracellular water, improving sludge dewatering performance, and further making the water content of the treated sludge reach below 60% by means of effective measures. The sludge extracellular polymeric substance is a polymeric compound which is secreted by microorganisms in certain environments and surrounds the cell walls of the microorganisms in the metabolic process of the microorganisms. EPS may be produced by bacteria, may be a hydrolysate or ions adsorbed from wastewater, or may be organic matter in wastewater adsorbed on flocs, and may include capsules, mucus layers, and other substances, wherein the organic portion is mainly composed of polysaccharides, proteins and DNA, lipids, humic acids, and the like. Studies have shown that most of the water in the sludge is bound in EPS, and therefore EPS is considered to be the most important factor affecting the sludge dewatering performance. The influence of chemical conditioning on the sludge dewatering performance is mentioned by many researches, but the chemical conditioning can hardly achieve effective wall breaking and release of intracellular bound water at the same time, and has the problems of large dosage, high cost and the like.
Common methods for breaking EPS and cell walls include chemical treatment, mechanical breaking, ultrasonic breaking, microwave, electrolysis, etc. However, the single treatment method has the problems of limited treatment efficiency, high cost, limited industrial application and the like. The osmotic pressure impact method is a method for pretreating sludge, and is characterized in that cells are put in a solution with high osmotic pressure, and water in the cells seeps outwards due to the action of the osmotic pressure, so that the cells shrink. When equilibrium is reached, the medium is rapidly diluted, or the cells are transferred into water or buffer, and extracellular water rapidly penetrates into the cells due to a sudden change in osmotic pressure, causing the cells to rapidly swell and burst. The osmotic pressure impact method is combined with the chemical method, so that the dosage of the medicament is greatly reduced, and the wall breaking efficiency is improved.
The method is characterized by comprising the following steps of (ultrasonic treatment activated sludge cell wall dehydration research, No. 6 of volume 39 in 2014, 105-108), researching the principle of treating the residual activated sludge by using ultrasonic waves, the influence of different condition factors on the treatment effect and the change condition of the property of the treated activated sludge. The cavitation of ultrasonic wave can break the cell wall and cell membrane of zoogloea in the activated sludge to release the cell fluid therein, and the like, thereby achieving the purpose of reducing the sludge volume. The high-frequency ultrasonic treatment can extract organic substances in cells in a short time; in the low frequency range, 44W of ultrasonic treatment has the best dewatering effect. When the ultrasonic treatment time at this frequency is 90 seconds, the water content of the sludge is the lowest (about 85%), and the dewatering effect is the best, and when the ultrasonic treatment time is less than 90 seconds or more than 90 seconds, the water content of the sludge is increased, and the dewatering effect is deteriorated. After the ultrasonic treatment, the properties of the activated sludge can be improved. The high-power ultrasonic waves can degrade biological sludge and release organic matters in the biological sludge; the low-power ultrasonic waves can improve the expansion characteristic and the dehydration capacity of the sludge and reduce the water content of the sludge. The COD of the sludge filtrate after ultrasonic treatment and simple filtration reaches about 4200 mg/L. The sedimentation performance of the sludge is gradually reduced along with the increase of the ultrasonic intensity. But the sludge sedimentation performance can still be kept in a better state in a low sound intensity range. However, the ultrasonic treatment has the problems of high cost, limited industrial application and the like.
CN106116107A discloses a method for deeply dewatering sludge, which comprises the steps of adding cement into the sludge, uniformly mixing to obtain mixed sludge, wherein the weight percentage of the water machine added is 1-30% of the sludge. And carrying out filter pressing on the mixed sludge to obtain a dewatered sludge cake. The invention also provides a filter pressing device. The invention can break the water molecular bond in the sludge by adding the sludge into the water-containing sludge to be treated as the conditioning agent, and the subsequent use of the sludge dewatering device can dewater the water to below 22wt percent, thereby obviously improving the deep dewatering effect of the sludge. But has the problems of large cement consumption, unfavorable transportation after solidification, resource utilization obstruction and the like.
Disclosure of Invention
Aiming at the defects of the prior art, the invention aims to provide a wall-breaking deep dehydration treatment method for residual activated sludge. The method adopts a combined technology of medicament conditioning and osmotic pressure impact wall breaking to carry out wall breaking pretreatment on the sludge, the treated materials enter a magnetic separator to carry out solid-liquid separation and simultaneously treat sewage, the separated solid materials are subjected to dehydration treatment after magnetic powder recovery to obtain dehydrated mud cakes, the dehydrated mud cakes can be used as raw materials for further resource utilization, no wastewater is generated in the whole process, and the sludge amount is remarkably reduced after deep dehydration of the sludge.
The invention provides a wall-breaking deep dehydration treatment method for residual activated sludge, which comprises the following steps:
(1) using a wall-breaking homogenization tank for receiving residual activated sludge and a treating agent, wherein the treating agent comprises triclocarban, nonylphenol polyoxyethylene ether, aluminum chloride and an auxiliary agent A, and reacting after uniformly mixing; after the reaction is finished, adding EDTA and sucrose solution into the tank, uniformly mixing, adding ice water for treatment, and obtaining a 1 st material flow after treatment, wherein the additive A is one or more of imipenem, meropenem and panipenem;
(2) a magnetic separator is used for receiving the 1 st material flow from the step (1), the auxiliary agent B, the magnetic powder solution and the water treatment agent, the separation is carried out after the reaction, the 2 nd material flow and the water are obtained after the separation, and the water obtained after the treatment can be directly discharged or recycled;
(3) a magnetic powder recovery device is used for receiving the 2 nd material flow obtained in the step (2), the magnetic powder is recycled after being recovered by the recovery device, and the 3 rd material flow is obtained after treatment; (4) and (3) using a sludge dehydrator for receiving the 3 rd material flow obtained from the step (3), dehydrating the 3 rd material flow to obtain dehydrated mud cakes and sewage, returning the sewage to the magnetic separator, wherein the water content of the mud cakes is less than 45%, and the mud cakes can be used as other resource-use raw materials.
In the treatment method, the weight ratio of the addition amount of the auxiliary agent A in the step (1) to the solid content of the residual activated sludge in the step (1) is 1: 700-1: 100, and the weight ratio of the addition amount of the triclocarban to the solid content of the residual activated sludge in the step (1) is 1: 1000-1: 100; the weight ratio of the added amount of the nonylphenol polyoxyethylene ether to the solid content of the residual activated sludge in the step (1) is 1: 400-1: 60; the weight ratio of the added amount of the aluminum chloride to the solid content of the residual activated sludge in the step (1) is 1: 1000-1: 100.
In the treatment method, the concentration of the EDTA solution in the step (1) is 2-20 mM, and the addition amount of the EDTA solution is 1/50-1/10 of the volume of the residual activated sludge in the step (1). In the treatment method, the concentration of the sucrose solution in the step (1) is 33wt% -37 wt%, the weight ratio of the addition amount of the sucrose solution to the solid content of the residual activated sludge in the step (1) is 1: 30-1: 10.
in the treatment method, the volume of the ice water in the step (1) is 1-5 times of the volume of the residual activated sludge. And adding ice water for post-treatment for 20-40 min.
In the treatment method, the auxiliary agent B in the step (2) is one or more of cationic polyacrylamide, anionic polyacrylamide, nonionic polyacrylamide, zwitterionic polyacrylamide and polyferric chloride, and the addition amount of the auxiliary agent B is 0.002-1 wt% of the solid content of the residual activated sludge; in the treatment method, the magnetic powder solution in the step (2) is a magnetic powder solution which is prepared from magnetic powder and water and has the concentration of 10wt% -20 wt%, and the using amount of the magnetic powder is 1wt% -5 wt% of the feeding amount of the magnetic separator.
In the treatment method, the water treatment agent in the step (2) is one or more of hydrogen peroxide, sodium hypochlorite, calcium hypochlorite and chlorine dioxide, and the weight ratio of the addition amount of the water treatment agent to the solid content of the residual activated sludge is 1: 200-1: 10.
In the treatment method, the sludge dewatering machine in the step (4) is one or more of a centrifugal dewatering machine, a plate-and-frame filter press, a stacked sludge dewatering machine and a belt filter press.
The water content of the dewatered mud cake obtained by the treatment method is less than or equal to 45 percent, the dewatered mud cake can be used as a raw material for further resource utilization, and the water treated by the magnetic separator can be directly discharged or recycled. The invention has the advantages of less dosage, obvious dehydration effect and great reduction of sludge amount. Compared with the prior art, the treatment method has the following characteristics:
1. in the treatment method of the present invention, the treatment agent binds to a protein molecule on a cell membrane to inhibit cell wall synthesis. The addition of the polyoxyethylene nonyl phenyl ether improves the dispersibility and the activity of the treating agent in use, and the synergistic effect of the polyoxyethylene nonyl phenyl ether and the triclocarban ensures the wall-breaking effect of the treating agent. Through the synergistic effect of all components in the treating agent, the floc structure of sludge extracellular polymers can be effectively dispersed and disintegrated, so that bound water in the floc is released, the hydrolysis of the extracellular polymers is promoted, and cell walls are further damaged. The osmotic pressure impact can accelerate the swelling and the rupture of the fragile cell walls, and the synergistic effect of the osmotic pressure impact can accelerate the rupture of the microbial cell membranes in the activated sludge to release cell contents more quickly, thereby realizing the purpose of cell disruption. In the treatment of the invention, the activity and stability of the auxiliary agent can be maintained by adding the aluminum chloride, and the critical micelle concentration of the treatment agent system is reduced by adding the aluminum chloride, so that the wall breaking efficiency can be further improved, and the dosage of the treatment agent can be reduced.
2. In the treatment method, the magnetic separator is adopted for solid-liquid separation after wall breaking of the sludge, the treatment capacity is large, the retention time is short, the energy consumption is low, meanwhile, the sewage is treated, and the treated effluent can be directly discharged or recycled. The sludge after magnetic separation treatment can greatly save the treatment difficulty of a subsequent dehydration unit, reduce or eliminate the need of adding dehydration medicaments, save the medicament consumption and bring no secondary pollution. 3. In the method, the mud cakes subjected to wall breaking-deep dehydration treatment are convenient to transport, mix or form, can be used as raw materials beneficial to further recycling, and realize waste utilization.
Detailed Description
The invention is further illustrated, but not limited, by the following examples.
Example 1
The concrete embodiment of the invention is illustrated by taking sludge in a residual sludge concentration tank of a certain sewage treatment plant as an example. Adding 0.04% TS sludge (TS is the total solid content of the sludge) of triclocarban, 0.25% TS sludge of nonylphenol polyoxyethylene ether, 0.1% TS sludge of aluminum chloride and 0.15% TS sludge of imipenem into the dewatered residual sludge with the water content of 96.35%, stirring and reacting for 40min, adding 2% sludge volume of 10mM EDTA and 5% sludge volume of 36% sucrose solution into the treated sludge, stirring for 20min, rapidly adding 3 times sludge volume of ice water, introducing into a feeding tank at the front end of a magnetic separator after the balance time is 30min, adding 0.2% polyaluminum chloride solution and 0.002% polyacrylamide solution as auxiliaries, adding 0.5% TS sludge of hydrogen peroxide, stirring for 30min, feeding, simultaneously feeding 2wt% magnetic powder solution with the concentration of 10%, and keeping the magnetic separator for 5 min. The effluent after magnetic separation is collected, and COD is measured to be 47mg/L, thereby meeting the requirements of the sewage comprehensive discharge standard. And the separated solid is subjected to magnetic powder recovery by a magnetic powder recovery device, the separated solid enters a stacked sludge dewatering machine for further dewatering, the water content of a dewatered sludge cake is 44.8%, the dewatered water returns to a feeding tank of a magnetic separator, and the sludge and the sewage are treated simultaneously without secondary pollution.
Example 2
The same treatment process as in example 1 was selected for the excess sludge material of example 1. Adding 0.1% TS sludge triclocarban, 0.8% TS sludge nonylphenol polyoxyethylene ether, 0.5% TS sludge aluminum chloride and 0.5% TS sludge meropenem into the dewatered residual sludge with the water content of 96.35%, stirring for 40min, adding 5% sludge volume of 20mM EDTA and 5% sludge volume of 36% sucrose solution, stirring for 20min, rapidly adding 3 times sludge volume of ice water, balancing for 30min, introducing into a feeding tank at the front end of a magnetic separator, adding 0.2% auxiliary agent polyaluminum chloride solution and 0.002% polyacrylamide solution, adding 0.5% TS sludge hydrogen peroxide, stirring for 30min, feeding 2wt% magnetic powder solution with the concentration of 10%, and keeping for 5 min. The effluent after magnetic separation is collected, and the COD is measured to be 46mg/L, thereby meeting the requirements of the sewage comprehensive discharge standard. And the separated solid is subjected to magnetic powder recovery by a magnetic powder recovery device, the separated solid enters a stacked sludge dewatering machine for further dewatering, the water content of a dewatered sludge cake is 43.4%, the dewatered water returns to a feeding tank of a magnetic separator, and the sludge and the sewage are treated simultaneously without secondary pollution.
Example 3
The same treatment process as in example 1 was selected for the excess sludge material of example 1. The dewatered residual sludge with the water content of 96.35 percent is added with trichlorocarban of 0.2 percent TS sludge, nonylphenol polyoxyethylene ether of 1.6 percent TS sludge, aluminum chloride of 1 percent TS sludge and panipenem of 1 percent TS sludge, and other conditions are the same as those in the example 1. The effluent after magnetic separation is collected, and the COD is measured to be 46mg/L, thereby meeting the requirements of the sewage comprehensive discharge standard. And the separated solid is subjected to magnetic powder recovery by a magnetic powder recovery device, the separated solid enters a stacked sludge dewatering machine for further dewatering, the water content of a dewatered sludge cake is 42.5%, the dewatered water returns to a feeding tank of a magnetic separator, and the sludge and the sewage are treated simultaneously without secondary pollution.
Example 4
The same treatment process as in example 1 was selected for the excess sludge material of example 1. To the dewatered excess sludge having a water content of 96.35%, triclocarban as a TS sludge of 0.18%, nonylphenol polyoxyethylene ether as a TS sludge of 1.2%, aluminum chloride as a TS sludge of 0.8%, imipenem as a TS sludge of 0.5% and meropenem as a TS sludge of 0.5% were added, and the other conditions were the same as in example 1. The effluent after magnetic separation is collected, and the COD is measured to be 45mg/L, thereby meeting the requirements of the sewage comprehensive discharge standard. And the separated solid is subjected to magnetic powder recovery by a magnetic powder recovery device, the separated solid enters a stacked sludge dewatering machine for further dewatering, the water content of a dewatered sludge cake is 41.3 percent, the dewatered water returns to a feed chute of a magnetic separator, and the sludge and the sewage are treated simultaneously without secondary pollution.
Example 5
The same treatment process as in example 1 was selected for the excess sludge material of example 1. To the dewatered excess sludge having a water content of 96.35%, triclocarban as a 0.16% TS sludge, nonylphenol polyoxyethylene ether as a 1.5% TS sludge, aluminum chloride as a 0.7% TS sludge, imipenem as a 0.3% TS sludge, meropenem as a 0.3% TS sludge, and panipenem as a 0.3% TS sludge were added, and the other conditions were the same as in example 1. The effluent after magnetic separation is collected, and the COD is measured to be 44mg/L, thereby meeting the requirements of the sewage comprehensive discharge standard. And the separated solid is subjected to magnetic powder recovery by a magnetic powder recovery device, the separated solid enters a stacked sludge dewatering machine for further dewatering, the water content of a dewatered sludge cake is 40.4%, the dewatered water returns to a feeding tank of a magnetic separator, and the sludge and the sewage are treated simultaneously without secondary pollution.
Comparative example 1
The starting materials and methods were the same as in example 1. However, the same procedure as in example 1 was repeated except that aluminum chloride was not added, that is, 0.04% TS-sludge triclocarban, 0.25% TS-sludge nonylphenol polyoxyethylene ether and 0.15% TS-sludge imipenem were added to the dewatered excess sludge having a water content of 96.35%. Collecting the effluent after magnetic separation, determining that COD is 64mg/L, recovering magnetic powder from the separated solid by a magnetic powder recovery device, further dehydrating the separated solid in a stacked sludge dehydrator, and controlling the water content of the dehydrated sludge cake to be 62.9%.
Comparative example 2
The starting materials and methods were the same as in example 2. However, the same procedure as in example 2 was repeated except that nonylphenol polyoxyethylene ether was not added, that is, 0.1% TS-sludge triclocarban, 0.5% TS-sludge aluminum chloride and 0.5% TS-sludge meropenem were added to the dewatered excess sludge having a water content of 96.35%. Collecting the effluent after magnetic separation, determining that COD is 64mg/L, recovering magnetic powder from the separated solid by a magnetic powder recovery device, further dehydrating the separated solid in a stacked sludge dehydrator, and controlling the water content of the dehydrated sludge cake to be 64.5%.
Comparative example 3
The starting materials and methods were the same as in example 3. However, the same conditions as in example 2 were used except that triclocarban was not added, that is, 1.6% of nonylphenol polyoxyethylene ether derived from TS sludge, 1% of aluminum chloride derived from TS sludge, and 1% of panipenem derived from TS sludge were added to the dewatered excess sludge having a water content of 96.35%. Collecting the effluent after magnetic separation, determining COD to be 68mg/L, recovering magnetic powder from the separated solid by a magnetic powder recovery device, further dehydrating the separated solid in a stacked sludge dehydrator, and controlling the water content of the dehydrated sludge cake to be 69.5%.
Comparative example 4
The starting materials and methods were the same as in example 4. But the method is not added with nonylphenol polyoxyethylene ether and aluminum chloride, namely, 0.18 percent of triclocarban of TS sludge, 0.5 percent of imipenem of TS sludge and 0.5 percent of meropenem of TS sludge are added into the dewatered residual sludge with the water content of 96.35 percent, and other conditions are the same as those in example 4. Collecting the effluent after magnetic separation, determining that COD is 65mg/L, recovering magnetic powder from the separated solid by a magnetic powder recovery device, further dehydrating the separated solid in a stacked sludge dehydrator, and controlling the water content of the dehydrated sludge cake to be 67.7%.
Claims (9)
1. A wall-breaking deep dehydration treatment method for residual activated sludge comprises the following steps:
(1) using a wall-breaking homogenization tank for receiving residual activated sludge and a treating agent, wherein the treating agent comprises triclocarban, nonylphenol polyoxyethylene ether, aluminum chloride and an auxiliary agent A, and reacting after uniformly mixing; after the reaction is finished, adding EDTA and sucrose solution into the tank, uniformly mixing, adding ice water for treatment, and obtaining a 1 st material flow after treatment, wherein the additive A is one or more of imipenem, meropenem and panipenem;
(2) a magnetic separator is used for receiving the 1 st material flow from the step (1), an auxiliary agent B, a magnetic powder solution and a water treatment agent, the 1 st material flow is separated after reaction, a 2 nd material flow and water are obtained after separation, the auxiliary agent B is one or more of cationic polyacrylamide, anionic polyacrylamide, nonionic polyacrylamide, zwitterionic polyacrylamide and polymeric ferric chloride, and the water treatment agent is one or more of hydrogen peroxide, sodium hypochlorite, calcium hypochlorite and chlorine dioxide;
(3) a magnetic powder recovery device is used for receiving the 2 nd material flow obtained in the step (2), the magnetic powder is recycled after being recovered by the recovery device, and the 3 rd material flow is obtained after treatment;
(4) a sludge dehydrator is used for receiving the 3 rd material flow obtained in the step (3), the 3 rd material flow is dehydrated to obtain dehydrated mud cakes and sewage, the sewage returns to the magnetic separator, and the water content of the mud cakes is less than 45%;
wherein the weight ratio of the addition amount of the auxiliary agent A to the solid content of the residual activated sludge in the step (1) is 1: 700-1: 100; the weight ratio of the added amount of the triclocarban to the solid content of the residual activated sludge in the step (1) is 1: 3000-1: 500; the weight ratio of the added amount of the nonylphenol polyoxyethylene ether to the solid content of the residual activated sludge in the step (1) is 1: 400-1: 60; the weight ratio of the adding amount of the aluminum chloride to the solid content of the residual activated sludge in the step (1) is 1: 1000-1: 100.
2. The processing method according to claim 1, characterized in that: in the step (1), the concentration of the EDTA solution is 2-20 mM.
3. The processing method according to claim 1, characterized in that: the addition amount of the EDTA solution in the step (1) is 1/50-1/10 of the volume of the residual activated sludge in the step (1).
4. The processing method according to claim 1, characterized in that: the concentration of the sucrose solution in the step (1) is 33wt% -37 wt%, and the weight ratio of the addition amount of the sucrose solution to the solid content of the residual activated sludge in the step (1) is 1: 30-1: 10.
5. the processing method according to claim 1, characterized in that: and (2) the volume of the ice water in the step (1) is 1-5 times of the volume of the residual activated sludge.
6. The processing method according to claim 1, characterized in that: the addition amount of the auxiliary agent B is 0.002wt% -1 wt% of the solid content of the residual activated sludge.
7. The processing method according to claim 1, characterized in that: the magnetic powder solution in the step (2) is prepared from magnetic powder and water, and the concentration of the magnetic powder solution is 10wt% -20 wt%, and the using amount of the magnetic powder is 1wt% -5 wt% of the feeding amount of the magnetic separator.
8. The processing method according to claim 1, characterized in that: the weight ratio of the addition amount of the water treatment agent to the solid content of the residual activated sludge is 1: 200-1: 10.
9. The processing method according to claim 1, characterized in that: the sludge dewatering machine in the step (4) is one or more of a centrifugal dewatering machine, a plate-and-frame filter press, a stacked sludge dewatering machine and a belt filter press.
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| CA2614763C (en) * | 2007-04-17 | 2010-06-22 | Mengjun Li | Method for dewatering of bctmp/ctmp sludge |
| CN104556523A (en) * | 2013-10-24 | 2015-04-29 | 中国石油化工股份有限公司 | Method for treating alkali residue liquid waste and three-sludge of oil refineries |
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| CA2614763C (en) * | 2007-04-17 | 2010-06-22 | Mengjun Li | Method for dewatering of bctmp/ctmp sludge |
| CN104556523A (en) * | 2013-10-24 | 2015-04-29 | 中国石油化工股份有限公司 | Method for treating alkali residue liquid waste and three-sludge of oil refineries |
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