A resource recovery system and process for powdered activated carbon sludge in the PACT process.

Abstract

This invention provides a resource recovery system and process for powdered activated carbon sludge in the PACT process, relating to the field of wastewater treatment. The system includes: a grinding device; an acid treatment device; and a settling separation device, including: a settling container and a ball valve installed on the settling container. When the ball valve is open, it connects the upper and lower parts of the settling container to allow the powdered activated carbon sludge treated by the acid treatment device to settle. When the ball valve is closed, it divides the settling container into several independent spaces from top to bottom to separate and recover components from different settling sections. Based on the structure and characteristics of the powdered activated carbon sludge components, this invention uses a combination of chemical and physical separation methods to minimize the ash content that affects the thermal regeneration of activated carbon, thereby improving the recovery rate and adsorption performance of activated carbon in the powdered activated carbon sludge. Ultimately, activated carbon capable of further thermal regeneration can be recovered, avoiding resource waste, achieving resource utilization, and reducing the economic cost of the process.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of sewage treatment, in particular to a resource recycling system and process for powdered carbon sludge in PACT process. BACKGROUND

[0002] With the process of industrialization and rapid development of urbanization, sludge treatment has become an important issue in the field of environmental protection. Sludge separation method is a new sludge treatment technology. The traditional sludge separation method is to separate the useful substances and harmful substances in the sludge, so as to reduce the emission of harmful substances. The steps of this method mainly include mixing sludge, adding separation agent, stirring and sedimentation, layering and separation, etc. Through these steps, harmful substances such as heavy metals, organic matter, impurities, etc. in the sludge can be separated out, so as to realize effective treatment and resource utilization of the sludge. The sludge separation method has wide application range and can be used for treating sludge in industrial wastewater, sludge in municipal sewage treatment plant and organic waste in farmland, etc.

[0003] PACT (Powdered Activated Carbon-Activated Sludge Process) is a kind of efficient sewage treatment process. A certain amount of powdered activated carbon is added in the aerobic system, and it plays a role by flowing back and discharging with the sludge. Because it has advantages in economy and treatment efficiency, it has been widely popularized and applied. However, the continuous use of new activated carbon increases the amount of hazardous waste discharged by enterprises and the cost of waste disposal, and the cost of sewage treatment will exceed the economic bearing capacity of enterprises. Therefore, the resource recycling of powdered carbon sludge in PACT process is particularly important.

[0004] Due to the particularity of the composition of powdered carbon sludge, the traditional sludge separation method is not applicable, and in the prior art, only the powdered activated carbon is recovered and reused by simple dehydration and thermal regeneration process of powdered carbon sludge, and the recovery rate is low. Therefore, it is an urgent problem for those skilled in the art to provide a resource recycling system and process for powdered carbon sludge in PACT process. SUMMARY

[0005] Therefore, the technical problem to be solved by the present application is to overcome the low recovery rate of powdered carbon sludge in PACT process, and to provide a resource recycling system and process for powdered carbon sludge in PACT process.

[0006] To achieve the above-mentioned purpose, the present application provides the following technical scheme:

[0007] In a first aspect, the present application provides a resource recycling system for powdered carbon sludge in PACT process, comprising a grinding device, an acid treatment device and a static settling separation device arranged in sequence,

[0008] The grinding device is used for grinding the powder carbon sludge to destroy the extracellular polymer and reduce the viscosity of the sludge.

[0009] The acid treatment device is used for acid washing the powder carbon sludge treated by the grinding device and water washing to neutral to remove the ash in the powder carbon sludge.

[0010] The standing and sedimentation separation device comprises a sedimentation container and a ball valve arranged on the sedimentation container, the ball valve is used for communicating the sedimentation container up and down when opened to make the powder carbon sludge treated by the acid treatment device stand and sediment, and the ball valve is used for separating and recovering the components of different sedimentation sections when closed.

[0011] Further, the grinding device selects a ball mill.

[0012] Further, the acid treatment device selects a container for acid washing and a suction filtration device for water washing.

[0013] Further, the container for acid washing selects a beaker or a test tube.

[0014] Further, the suction filtration device for water washing comprises a Buchner funnel, a suction filtration bottle and a suction pump connected in sequence.

[0015] Further, the sedimentation container selects a transparent glass tube with an open upper end, and the number of the ball valves is at least two.

[0016] Further, the number of the ball valves is two, and the two ball valves separate the sedimentation space of the sedimentation container into three spaces with a volume ratio of 1:1:1 or 1:2:1 from top to bottom.

[0017] Further, the ratio of the sample loading height to the inner diameter of the sedimentation container is 60:1, and the sample loading height of the sedimentation container is 60-120 cm.

[0018] In a second aspect, the present application provides a resource recycling process of powder carbon sludge in a PACT process, which is performed by using the resource recycling system of powder carbon sludge in a PACT process, and the process comprises the following steps:

[0019] (1) using the grinding device to grind the powder carbon sludge;

[0020] (2) putting the powder carbon sludge treated by the grinding device into the acid treatment device, adding acid to adjust pH, and then adding water to perform suction filtration until the sludge is neutral;

[0021] (3) opening the ball valve, putting the powder carbon sludge treated by the acid treatment device into the sedimentation container, standing, closing the ball valve, and recovering the components of different sedimentation sections.

[0022] Further, in step (1), the grinding device is selected as a ball mill, and the ball milling conditions include: the mass ratio of grinding balls to powder carbon sludge is 10:1, the grinding balls with a diameter of 3mm account for 30%, the grinding balls with a diameter of 5mm account for 70%, the rotation speed of the ball mill is 650rpm, the rotation direction is alternated, the rotation is 9min and the stop is 1min, and the total time is 1h.

[0023] Further, in step (2), the type of acid added is concentrated hydrochloric acid, and the pH is adjusted to 2.5-3.0.

[0024] Further, in step (3), the number of ball valves is two, the settling space of the settling container is divided into three spaces with a volume ratio of 1:1:1 or 1:2:1 from top to bottom by the two ball valves, the ratio of the sample loading height to the inner diameter of the settling container is 60:1, and the sample loading height of the settling container is 60-120cm.

[0025] When the volume ratio is 1:1:1, the standing time is 0.5min.

[0026] When the volume ratio is 1:2:1, the standing time is 1min.

[0027] Further, in step (3), the powder carbon sludge treated by the acid treatment device is dried and then water is added to prepare a sludge-water mixture with a concentration of 7500mg / L, and then the sludge-water mixture is put into the settling container.

[0028] Further, in step (3), after the ball valves are closed, the components in the upper and middle settling sections are taken out, the powder activated carbon is recovered by a thermal regeneration process, and then the powder activated carbon is reused in the PACT process.

[0029] The technical scheme of the present application has the following advantages:

[0030] The PACT process powder carbon sludge recycling system provided by the application comprises a grinding device, an acid treatment device and a static settling separation device arranged in sequence, and the process provided by the application comprises the steps of grinding, acid treatment and static settling separation. The grinding device is used for grinding the powder carbon sludge to destroy the extracellular polymer and reduce the viscosity of the sludge, and then to destroy the adhesion state among the organic matter, ash (inorganic matter) and activated carbon in the sludge system, so that the dispersibility is higher and the separation is easier. The acid treatment device is used for pickling and water washing the powder carbon sludge treated by the grinding device to neutralization. In the pickling process, the ash (such as oxides of Fe and Al, basic phosphates of alkaline earth metals, etc.) in the sludge is dissolved in the acid, and can be removed by water washing. The static settling separation device comprises a settling container and a ball valve arranged on the settling container. When the ball valve is opened, the settling container is connected in an up-down mode to make the powder carbon sludge treated by the acid treatment device to be static settled. When the ball valve is closed, the settling container is divided into a plurality of independent spaces from top to bottom to separate and recycle the components in different settling sections. The densities and settling properties of the organic matter, ash and activated carbon in the sludge system after acid treatment are different. The inventors found in the research process that after a period of static setting, the upper part of the components is separated into different components by closing the ball valve from top to bottom. The proportion of activated carbon and organic matter is greatly improved, and the proportion of ash is obviously reduced. Although a small amount of organic matter is mixed in the separated activated carbon, the organic matter has no effect on the subsequent powder activated carbon thermal regeneration process. That is, the activated carbon component in the sludge is enriched and separated by the static settling separation device, and the recycling rate of the activated carbon is obviously improved.

[0031] According to the structure and characteristics of the powder carbon sludge components, the application reduces the ash content affecting the thermal regeneration of activated carbon to a minimum value by a chemical and physical separation method, thereby improving the recycling rate and adsorption performance of the activated carbon in the powder carbon sludge. Ultimately, the activated carbon that can continue to be thermally regenerated can be recycled, resource waste is avoided, resource utilization is realized, the economic cost of the process is reduced, and the separation technology maximizes the economic and green environmental protection advanced concept. BRIEF DESCRIPTION OF DRAWINGS

[0032] In order to more clearly illustrate the technical solutions in the specific embodiments or the prior art of the application, the drawings needed in the specific embodiments or the prior art description will be briefly introduced below. Obviously, the drawings in the following description are some embodiments of the application, and those skilled in the art can also obtain other drawings according to these drawings without creating any inventive labor.

[0033] Figure 1 is a structural schematic diagram of the PACT process powder carbon sludge recycling system provided by the embodiment 1 and the embodiment 2 of the application.

[0034] Figure 2 is a structural schematic diagram of the static settling separation device provided by embodiments 1 and 2 of the present application;

[0035] Figure 3 is a flow schematic diagram of the resource recycling method of the powder carbon sludge in the PACT process provided by embodiments 3 and 4 of the present application;

[0036] Figure 4 is a statistical diagram of the composition ratio of each component in the powder carbon sludge before and after static separation in experimental group 2 in the experimental examples of the present application.

[0037] Reference signs:

[0038] 1 - settling container; 2 - ball valve. DETAILED DESCRIPTION

[0039] The technical solutions of the present application will be described clearly and completely below in combination with the drawings. Obviously, the described embodiments are part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor fall within the scope of protection of the present application.

[0040] In the description of the present application, it should be noted that the terms "middle", "upper", "lower" and the like indicate the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the present application.

[0041] In addition, the technical features involved in different embodiments of the present application described below can be combined with each other as long as they do not conflict with each other.

[0042] As shown in Figure 1 The present application provides a resource recycling system of powder carbon sludge in a PACT process, which comprises a grinding device, an acid treatment device and a static settling separation device arranged in sequence.

[0043] The main components in the powder carbon sludge include organic matter, ash (inorganic matter) and activated carbon. The purpose of resource recycling is mainly to separate the components, increase the content of activated carbon and reduce the content of ash, thereby increasing the thermal regeneration efficiency and recycling rate.

[0044] The grinding device is used to grind the powder carbon sludge to destroy the extracellular polymer and reduce the viscosity of the sludge, thereby destroying the adhesion state between the organic matter, ash and activated carbon in the sludge system and making it have a higher dispersibility and be easier to separate.

[0045] The acid treatment device is used for acid washing and water washing to neutralize the powdered carbon sludge treated by the grinding device. In the acid washing process, the ash (such as oxides of Fe, Al and the like, basic phosphates of alkaline earth metals and the like) in the sludge is dissolved in the acid, and it can be removed by water washing. That is, part of the ash in the powdered carbon sludge can be removed by the acid treatment device to reduce the ash content in the sludge, thereby reducing the influence on the subsequent powdered activated carbon regeneration process.

[0046] As shown in Figure 2 The static settling separation device includes a settling container 1 and a ball valve 2 arranged on the settling container 1. When the ball valve 2 is opened, the settling container 1 is connected up and down to allow the powdered carbon sludge treated by the acid treatment device to be statically settled. When the ball valve is closed, the settling container is divided into several independent spaces from top to bottom to separate and recover the components in different settling sections. In the sludge system treated by the acid treatment device, the densities and settling properties of the organic matter, ash and activated carbon are different. When the powdered carbon sludge treated by the acid treatment device is put into the settling container 1, the ball valve 2 is in the open state. During the static settling process, the sludge settles, and the components in different settling sections are different. Through experiments, it is found that the components in the settling section close to the upper part contain a high content of organic matter and activated carbon, and a low content of ash. Therefore, after the static settling is completed, the ball valve 2 is closed to separate the components in different settling sections, and they are taken out in turn. The components in the upper settling section are taken out to carry out the thermal regeneration process of the powdered activated carbon, and the regenerated powdered activated carbon is recycled to the PACT process.

[0047] As an optional embodiment of the present application, the grinding device is a ball mill.

[0048] As an optional embodiment of the present application, the acid treatment device includes a container for acid washing and a suction filtration device for water washing. The container for acid washing is selected from a beaker, a test tube or any other container capable of containing powdered carbon sludge, and acid is added to the container through a dropper and mixed. The suction filtration device for water washing can be selected from a conventional Buchner funnel, a suction filtration bottle and a suction pump for suction filtration, or any other device capable of achieving the suction filtration function. Water is added to the powdered carbon sludge after acid washing to achieve the removal of the acid liquid.

[0049] As an optional embodiment of the present application, the settling container 1 is a transparent glass tube with an open upper end, and the number of ball valves 2 is at least two. It can be understood that the present application does not limit the shape, volume, etc. of the settling container 1, and any container that can complete the static settling process can be used. Preferably, the number of ball valves 2 is two, and the two ball valves 2 divide the settling space of the settling container 1 (i.e. the space for loading the powdered activated carbon sample to be settled, which is not equivalent to the volume of the settling container) into three spaces from top to bottom with a volume ratio of 1:1:1 or 1:2:1. More preferably, the ratio of the sample loading height to the inner diameter of the settling container is 60:1; the sample loading height of the settling container is 60-120 cm.

[0050] As shown in Figure 3 , the present application also provides a resource recycling process for powdered carbon sludge in the PACT process based on the foregoing system, comprising the following steps:

[0051] (1) using a grinding device to grind the powdered carbon sludge;

[0052] (2) putting the powdered carbon sludge treated by the grinding device into an acid treatment device, adding acid to adjust the pH, and then adding water to perform suction filtration until the sludge is neutral;

[0053] (3) opening the ball valve, putting the powdered carbon sludge treated by the acid treatment device into the settling container, standing, closing the ball valve, and recycling the components in different settling sections.

[0054] As an optional embodiment of the present application, in step (1), the grinding device is a ball mill, for example, the tank volume of the ball mill can be 50 mL, and the total volume of the powdered carbon sludge and the grinding balls reaches 2 / 3 of the full tank; the ball milling conditions include: the mass ratio of the grinding balls to the powdered carbon sludge is 10:1, the grinding balls with a diameter of 3 mm account for 30%, the grinding balls with a diameter of 5 mm account for 70%, the ball milling speed is 650 rpm, the rotation direction is alternately forward and reverse, the rotation time is 9 min and the stop time is 1 min, and the total time is 1 h.

[0055] As an optional embodiment of the present application, in step (2), the type of acid added is concentrated hydrochloric acid; the pH is adjusted to 2.5-3.0, preferably 3.0.

[0056] As an optional embodiment of the present application, in step (3), the number of ball valves is two, and the two ball valves divide the settling space of the settling container into three spaces from top to bottom with a volume ratio of 1:1:1 or 1:2:1; when the volume ratio is 1:1:1, the standing time is 0.5 min; when the volume ratio is 1:2:1, the standing time is 1 min; optionally, the ratio of the sample loading height to the inner diameter of the settling container is 60:1, the sample loading height is 60-120 cm, and preferably 120 cm.

[0057] As an optional embodiment of the present application, in step (3), the components in the upper and middle settling sections are taken after the ball valve is closed, and the powdered activated carbon is recovered by a thermal regeneration process and reused in the PACT process. The thermal regeneration process is a prior art of powdered activated carbon regeneration, which is not described herein.

[0058] Example 1

[0059] As shown in the figure, the present embodiment provides a resource recycling system of powdered carbon sludge in a PACT process, which is composed of a grinding device, an acid treatment device and a static settling separation device arranged in sequence. The grinding device selects a ball mill (50 mL tank body). The acid treatment device selects a beaker for pickling and a suction filtration device (a Buchner funnel, a suction filtration bottle and a suction pump connected in sequence) for water washing. As shown in the figure, the static settling separation device is composed of a settling container 1 and two ball valves 2 arranged on the settling container 1. The settling container 1 selects a transparent glass tube with an open upper end. The diameter of the glass tube is 2 cm, and the sample loading height is 120 cm. The two ball valves 2 are arranged from top to bottom, which divides the settling space of the settling container 1 into three spaces with a volume ratio of 1:1:1 from top to bottom. Figure 1 Figure 2 Example 2

[0060] As shown in the figure, the present embodiment provides a resource recycling system of powdered carbon sludge in a PACT process, which is composed of a grinding device, an acid treatment device and a static settling separation device. The grinding device selects a ball mill (50 mL tank body). The acid treatment device selects a beaker for pickling and a suction filtration device (a Buchner funnel, a suction filtration bottle and a suction pump connected in sequence) for water washing. As shown in the figure, the static settling separation device is composed of a settling container 1 and two ball valves 2 arranged on the settling container 1. The settling container 1 selects a transparent glass tube with an open upper end. The diameter of the glass tube is 2 cm, and the sample loading height is 120 cm. The two ball valves 2 are arranged from top to bottom, which divides the settling space of the settling container 1 into three spaces with a volume ratio of 1:2:1 from top to bottom.

[0061] Example 3 Figure 1 Figure 2 As shown in the figure, the present application also provides a resource recycling process of powdered carbon sludge in a PACT process based on the foregoing system. The system provided in Example 1 is used, and the specific steps are as follows:

[0062] Example 3

[0063] As shown in the figure, the present application also provides a resource recycling process of powdered carbon sludge in a PACT process based on the foregoing system. The system provided in Example 1 is used, and the specific steps are as follows: Figure 3

[0064] ​​​(1) using a ball mill to grind the powder carbon sludge, the total volume of the powder carbon sludge and the grinding ball reaches 2 / 3 of the full tank; the mass ratio of the grinding ball to the powder carbon sludge is 10:1, the grinding ball with a diameter of 3mm accounts for 30%, the grinding ball with a diameter of 5mm accounts for 70%, the rotation speed of the ball mill is 650rpm, the rotation is positive and negative alternately, the rotation is 9min and the stop is 1min, and the total time is 1h;

[0065] (2) the powder carbon sludge treated by the ball mill is put into an acid treatment device, concentrated hydrochloric acid is added to adjust the pH to 3.0, and then water is added to perform suction filtration until the sludge is neutral;

[0066] (3) the two ball valves are opened, the powder carbon sludge treated by the acid treatment device is dried, then water is added to prepare a sludge-water mixture with a concentration of 7500mg / L, the sludge-water mixture is put into a sedimentation container, and the sludge-water mixture is placed for 0.5min, then the two ball valves are closed, the components in the upper and middle sedimentation sections are recovered, the powder activated carbon is recovered through a heat regeneration process, and the powder activated carbon is reused in the PACT process.

[0067] Example 4

[0068] As shown in Figure 3 the present application also provides a resource recovery process of powder carbon sludge in a PACT process based on the foregoing system, and the specific steps are as follows:

[0069] (1) using a ball mill to grind the powder carbon sludge, the total volume of the powder carbon sludge and the grinding ball reaches 2 / 3 of the full tank; the mass ratio of the grinding ball to the powder carbon sludge is 10:1, the grinding ball with a diameter of 3mm accounts for 30%, the grinding ball with a diameter of 5mm accounts for 70%, the rotation speed of the ball mill is 650rpm, the rotation is positive and negative alternately, the rotation is 9min and the stop is 1min, and the total time is 1h;

[0070] (2) the powder carbon sludge treated by the ball mill is put into an acid treatment device, concentrated hydrochloric acid is added to adjust the pH to 3.0, and then water is added to perform suction filtration until the sludge is neutral;

[0071] (3) the two ball valves are opened, the powder carbon sludge treated by the acid treatment device is dried, then water is added to prepare a sludge-water mixture with a concentration of 7500mg / L, the sludge-water mixture is put into a sedimentation container, and the sludge-water mixture is placed for 1min, then the two ball valves are closed, the components in the upper and middle sedimentation sections are recovered, the powder activated carbon is recovered through a heat regeneration process, and the powder activated carbon is reused in the PACT process.

[0072] Experimental example

[0073] The powder carbon sludge after dewatering treatment of a secondary sedimentation tank of a certain sewage plant is taken, and the component composition is shown in Table 1.

[0074] The detection method of iodine value refers to the standard “GB / T7702.7-2008 Coal Quality Granular Activated Carbon Test Method Determination of Iodine Adsorption Value”.

[0075] The detection method of water content, organic matter, carbon content and ash content is as follows:

[0076] (1) The empty crucible is weighed as G1, and an appropriate amount of dry carbon sludge to be detected is taken in the crucible, weighed as G2, and placed in a 110°C oven for drying for 2h, taken out and cooled to room temperature, weighed, and then weighed again every 30min of drying until the constant weight G3, and the water content is calculated;

[0077] (2) The empty quartz boat is weighed as M1, and an appropriate amount of dry carbon sludge to be detected is taken in the quartz boat, weighed as M2, and placed in a tube furnace, and nitrogen is introduced for 10min to extract to vacuum, and after reaching the oxygen-free condition, it is heated to 600°C for 30min, and then pyrolysis is performed at 600°C for 60min, and after cooling to room temperature, it is taken out and weighed as M3, and the organic matter content is calculated;

[0078] (3) The empty crucible is weighed as M4, and the carbon sludge after pyrolysis in step (2) is transferred to the crucible, weighed as M5, placed in a muffle furnace, and heated to 600°C under oxygen for 30min, and then burned for 60min, and after cooling to room temperature, it is taken out and weighed as M6, and the carbon content and ash content are calculated.

[0079] The calculation formula of each index is as follows:

[0080] Water content = (G2-G3) / (G2-G1)

[0081] Organic matter = (M2-M3) / (M2-M1)

[0082] Carbon content = (M5-M6) / (M5-M4)

[0083] Ash content = M6-M4

[0084] Table 1 Composition of powder carbon sludge

[0085] Moisture content Organic matter Carbon content Ash content Iodine value 64.00％ 3.21％ 11.74％ 21.05％ 200 mg / g

[0086] The powder carbon sludge is dried, and the carbon content in the dried powder carbon sludge should be 32.61%, and the ash content should be 58.47%. It can be seen that a large amount of ash will affect the regeneration efficiency when only the dewatered powder carbon sludge is subjected to thermal regeneration treatment, and the recovery rate of the powder activated carbon is low.

[0087] A certain amount of dried powder carbon sludge was taken into a ball mill, the tank volume of the ball mill was 50 mL, the total volume of the powder carbon sludge and the grinding balls reached 2 / 3 of the full tank; the mass ratio of the grinding balls to the powder carbon sludge was 10:1, the grinding balls with a diameter of 3 mm accounted for 30%, the grinding balls with a diameter of 5 mm accounted for 70%, the rotation speed of the ball mill was 650 rpm, the rotation direction was alternated, the rotation was 9 min and the stop was 1 min, the total time was 1 h; the powder carbon sludge after ball milling was put into a beaker, concentrated hydrochloric acid was added to adjust the pH value to 3.0, and then water washing and filtration were carried out in a filtration device until the pH value of the sample sludge was neutral; finally, a proper amount of acid-treated powder carbon sludge was dried, weighed, and the total mass of organic matter and carbon and the mass of ash in the sample were determined, and then the dried powder carbon sludge was added with water to prepare a sludge-water mixture with a concentration of 7500 mg / L, and the sludge-water mixture was placed in the static settling separation devices provided in Example 1 and Example 2 (experimental group 1: using the static settling separation device of Example 1, the static settling time was 0.5 min; experimental group 2: using the static settling separation device of Example 2, the static settling time was 1 min), and the samples in the upper, middle and lower settling sections were taken after the ball valve was closed, dried, and the total mass (dry weight) and the total mass of organic matter and carbon and the mass of ash (dry weight) in each section were determined, and the results are shown in Table 2.

[0088] Table 2 Change of content of each component in powder carbon sludge before and after static separation

[0089]

[0090] Note: Sample A is the powder carbon sludge before static settling separation; Sample B is the sample in the upper part of the pipe after static settling separation; Sample C is the sample in the middle part of the pipe after static settling separation; Sample D is the sample in the lower part of the pipe after static settling separation.

[0091] As shown in Table 2, after the dry powder carbon sludge was treated by grinding and acid treatment, the measured relative proportion of organic matter and carbon was 65.22%, and the relative proportion of ash was 34.78%. It is proved that part of the ash can be removed during the grinding and acid treatment processes.

[0092] Take 2.60 g of acid treated powder carbon sludge in the static sedimentation separation device provided in Example 1 (the upper, middle and lower three parts volume ratio is 1:1:1) for static sedimentation separation, after 0.5 min, the relative proportion of organic matter and carbon in the upper part sample is 70.64%, the relative proportion of ash is 29.36%, the relative proportion of organic matter and carbon in the middle part sample is 70.84%, the relative proportion of ash is 29.16%, the relative proportion of organic matter and carbon in the lower part sample is 61.69%, and the relative proportion of ash is 38.31%. That is, after static separation, the relative proportion of organic matter and carbon in the upper and middle two parts is improved, which is about 5% higher than that of sample A, and about 9% higher than that of the lower part volume sample, and the absolute proportion of total organic matter and carbon in the upper and middle two parts reaches 42.22%; the relative proportion of ash in the upper and middle two parts is reduced, which is about 5% lower than that of sample A, and about 9% lower than that of the lower part volume sample.

[0093] Take 2.60 g of acid treated powder carbon sludge in the static sedimentation separation device provided in Example 2 (the upper, middle and lower three parts volume ratio is 1:2:1) for static sedimentation separation, after 1 min, the relative proportion of organic matter and carbon in the upper part sample is 70.57%, the relative proportion of ash is 29.43%, the relative proportion of organic matter and carbon in the middle part sample is 69.99%, the relative proportion of ash is 30.01%, the relative proportion of organic matter and carbon in the lower part sample is 60.51%, and the relative proportion of ash is 39.49%. That is, after static separation, the relative proportion of organic matter and carbon in the upper and middle two parts is improved, which is about 6% higher than that of sample A, and about 10% higher than that of the lower part volume sample, and the absolute proportion of total organic matter and carbon in the upper and middle two parts reaches 43.88%; the relative proportion of ash in the upper and middle two parts is reduced, which is about 6% lower than that of sample A, and about 10% lower than that of the lower part volume sample. As shown in Figure 4 The relative proportion of organic matter, carbon and ash in the powder carbon sludge before and after static separation is shown in the table, it can be seen that the relative proportion of carbon in the upper and middle two parts after static sedimentation separation is obviously higher than that before separation and the lower part after separation, and the relative proportion of ash in the upper and middle two parts after static sedimentation separation is obviously lower than that before separation and the lower part after separation.

[0094] The above experiments prove that the system and method provided by the application can effectively improve the recovery rate of activated carbon, reduce the ash content affecting thermal regeneration, and thus improve the regeneration and recovery efficiency of powder activated carbon, and promote the resource utilization of powder carbon sludge.

[0095] Obviously, the above-mentioned embodiments are only examples for clearly illustrating the present application, and are not intended to limit the embodiments. Based on the above description, other different forms of changes or variations can be made by those skilled in the art. Here, it is not necessary and also impossible to enumerate all the embodiments. The obvious changes or variations derived from the above description are still within the protection scope of the present application.

Claims

1. A system for resource recovery of powdered carbon sludge in a PACT process, characterized by, The system comprises sequentially arranged grinding device, acid treatment device and static settling separation device, The grinding device is used for grinding the powdered carbon sludge to destroy the extracellular polymer and reduce the viscosity of the sludge. The acid treatment device is used for acid washing and water washing to neutralize the powdered carbon sludge treated by the grinding device to remove ash in the powdered carbon sludge. The static settling separation device comprises a settling container and a ball valve arranged on the settling container, the ball valve is used for connecting the settling container up and down when opened to make the powdered carbon sludge treated by the acid treatment device to be statically settled, and the ball valve is used for separating the settling container into several independent spaces from top to bottom when closed to take the components of the upper and middle settling sections after the ball valve is closed, the powdered activated carbon is recovered by a thermal regeneration process and reused in the PACT process.

2. The system for resource recovery of powdered carbon sludge in a PACT process according to claim 1, wherein, The grinding device is a ball mill.

3. The system for resource recovery of powdered carbon sludge in a PACT process of claim 1, wherein, The acid treatment device comprises a container for acid washing and a suction filtration device for water washing.

4. The system for resource recovery of powdered carbon sludge in a PACT process of claim 1, wherein, The settling container is a transparent glass tube with an open upper end, and the number of the ball valves is at least two.

5. The system for resource recovery of powdered carbon sludge in a PACT process of claim 1, wherein, The number of the ball valves is two, the settling space of the settling container is separated into three spaces from top to bottom by the two ball valves, the volume ratio of the three spaces is 1:1:1 or 1:2:1, the ratio of the sample loading height to the inner diameter of the settling container is 60:1, and the sample loading height of the settling container is 60-120 cm.

6. A process for resource recovery of powdered carbon sludge in a PACT process, characterized by, The resource recycling system of the powdered carbon sludge in the PACT process of any one of claims 1-5 is used, and the process comprises the following steps: (1) grinding the powdered carbon sludge by using the grinding device; (2) putting the powdered carbon sludge treated by the grinding device into the acid treatment device, adding acid to adjust pH, and then adding water to perform suction filtration until the sludge is neutral; (3) opening the ball valve, putting the powdered carbon sludge treated by the acid treatment device into the settling container, and statically settling, then taking the components of the upper and middle settling sections after the ball valve is closed, recovering the powdered activated carbon by a thermal regeneration process, and reusing it in the PACT process.

7. The process for resource recovery of powdered char sludge in PACT process as claimed in claim 6 wherein, In step (1), the grinding device is a ball mill, and the ball milling conditions include: the mass ratio of the grinding ball to the powdered carbon sludge is 10:1, the diameter of the grinding ball is 3 mm, the grinding ball accounts for 30%, the diameter of the grinding ball is 5 mm, the grinding ball accounts for 70%, the rotation speed of the ball mill is 650 rpm, the rotation direction is alternately forward and reverse, the rotation time is 9 min and the stop time is 1 min, and the total time is 1 h.

8. The process for resource recovery of powdered carbonaceous sludge in PACT process as claimed in claim 6 wherein, In step (2), the type of the added acid is concentrated hydrochloric acid, and the pH is adjusted to 2.5-3.

0.

9. The process for resource recovery of powdered char sludge in PACT process as claimed in claim 6 wherein, In step (3), the number of the ball valves is two, the settling space of the settling container is separated into three spaces from top to bottom by the two ball valves, the volume ratio of the three spaces is 1:1:1 or 1:2:1, the ratio of the sample loading height to the inner diameter of the settling container is 60:1, and the sample loading height of the settling container is 60-120 cm. When the volume ratio is 1:1:1, the static settling time is 0.5 min. When the volume ratio is 1:2:1, the static settling time is 1 min. The powdered carbon sludge treated by the acid treatment device is dried, then water is added to prepare a sludge-water mixture with a concentration of 7500 mg / L, and then the sludge-water mixture is put into the settling container.

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