A method and system for wastewater treatment based on deep dewatering conditioning

Abstract

The present application relates to the field of sewage treatment, in particular to a sewage treatment method and system based on deep dewatering conditioning. The system comprises an original concentration tank, a buffer mechanism is arranged on the side of the original concentration tank, the buffer tank is communicated with the original concentration tank through a main sludge pump, a sludge activation mechanism is arranged on one side of the buffer tank, a guide pipe is arranged in the activation cylinder and communicated with the buffer tank through a secondary sludge pump, a flow stabilizing cylinder is arranged above the guide pipe, and an aeration plate is arranged below the guide pipe, a sludge conditioning mechanism is arranged on one side of the activation cylinder, the conditioning cylinder is coaxial with a reaction cylinder, a secondary agitator is arranged on the reaction cylinder, the conditioning cylinder has five circulating corridors with reaction balls, and a curing mechanism is arranged on one side of the conditioning cylinder and communicated with the conditioning cylinder. A plate-and-frame filter press is arranged on one side of the curing tank. The system realizes deep dewatering conditioning through the cooperation of the mechanisms to buffer, activate, condition, cure and filter press the sewage sludge.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of sewage treatment, in particular to a sewage treatment method and system based on deep dewatering conditioning. BACKGROUND

[0002] The residual sludge generated in the operation process of sewage treatment plants contains a large amount of organic matter, pathogens, parasites and heavy metals and other toxic and harmful substances, and is accompanied by odor and easy to spoil, which will cause serious secondary pollution to the environment if not properly treated. The overall goal of sludge treatment and disposal is to ensure that the toxic and harmful substances in the sludge do not cause unacceptable harm to humans and the environment, both now and in the future. The basic principle of sludge treatment and disposal is reduction, stabilization and resource utilization.

[0003] The sludge conditioning device is an important link in the sludge treatment system. Its main function is to strengthen the treatment of sludge added with sludge conditioning agent, so that it becomes more stable sludge. At present, some sewage treatment plants have simple conditioning facilities and conditioning methods when treating sludge, so that the moisture content of the conditioned sludge after being pressed by the filter press is higher than 60%, which cannot meet the discharge standard, causing certain difficulties in sludge reduction and resource utilization.

[0004] In addition, the pretreatment of sludge in the traditional system is not sufficient. Many systems directly treat the anaerobic sludge in the original concentration tank without effective pre-activation, which leads to the difficulty of sludge in the subsequent treatment process to fully react with the conditioning agent and filter aid, affecting the dewatering effect of sludge. For example, some systems simply stir the sludge, which cannot break the complex structure of the sludge, and the water in the sludge is difficult to release.

[0005] On the other hand, the links in the sludge treatment process are not closely connected, and the reaction efficiency is low. In the process of sludge activation, conditioning, etc., there is a lack of reasonable structure design and reaction condition control. For example, some activation devices cannot guarantee sufficient aeration and circulation fluidization of the sludge, and the conditioning device cannot realize multi-stage efficient reaction of the sludge and the reagent, so that the sludge treatment period is long, the energy consumption is high, and the moisture content of the finally dewatered sludge is still high, which cannot meet the requirements of resource utilization.

[0006] Therefore, it is urgent to develop an efficient sewage treatment system based on deep dewatering conditioning. SUMMARY

[0007] Therefore, it is necessary to provide a sewage treatment method and system based on deep dewatering conditioning in view of the problems in the prior art.

[0008] To solve the problems in the prior art, the technical scheme adopted by the present application is as follows:

[0009] The sewage treatment system based on deep dewatering conditioning comprises an original concentration tank, and further comprises:

[0010] The buffer mechanism is arranged beside the original concentration tank, and the buffer mechanism comprises a buffer tank in communication with the original concentration tank through a main sludge pump, a sludge activation mechanism arranged on a side of the buffer tank away from the original concentration tank, the sludge activation mechanism comprising an activation cylinder, a flow guide pipe coaxially arranged in the inside of the activation cylinder and in communication with the buffer tank through a secondary sludge pump, a steady flow cylinder coaxially arranged on the upper portion of the flow guide pipe and fixedly connected with the upper end of the activation cylinder, an aeration plate coaxially arranged below the flow guide pipe and fixedly connected with the lower portion of the activation cylinder, a sludge conditioning mechanism arranged on a side of the activation cylinder away from the buffer tank, the sludge conditioning mechanism comprising a conditioning cylinder and a reaction cylinder fixedly connected with the conditioning cylinder in a coaxial manner, a secondary agitator fixedly connected with the upper end of the reaction cylinder, the output end of the secondary agitator being arranged downward, five circulating corridors sequentially formed from bottom to top in the conditioning cylinder, a plurality of reaction balls arranged in each circulating corridor, and a maturation mechanism arranged on a side of the conditioning cylinder away from the activation cylinder, the maturation mechanism comprising a maturation tank in communication with the conditioning cylinder, and a plate-and-frame filter press arranged on a side of the maturation tank away from the conditioning cylinder.

[0011] Further, the buffer mechanism further comprises a plurality of primary agitators and a plurality of baffles, the plurality of baffles being arranged in the inside of the buffer tank at equal intervals and fixedly connected with the buffer tank, the baffles being provided with sludge passing holes, buffer cavities being formed between adjacent two baffles and between the baffles and the end portions of the buffer tank, and the primary agitators being arranged at the upper ends of the buffer cavities and fixedly connected with the top of the buffer tank.

[0012] Further, the lower end of the flow guide pipe is fixedly connected with a perforated bottom plate, the outside of the steady flow cylinder is coaxially arranged with a circulating sludge collecting groove fixedly connected with the inner wall of the activation cylinder, the circulating sludge collecting groove is in communication with the reaction cylinder through a conduit, and the outside of the activation cylinder is coaxially arranged with a plurality of ultrasonic liquid level sensors.

[0013] Further, the lower end of the steady flow cylinder is formed with an outward expanding portion in the shape of a horn with an inclination angle of 135°.

[0014] Further, the sludge activation mechanism further comprises a main reaction pipe, a bottom discharge pipe and an air inlet pipe, a plurality of single-hole membrane aerators are fixedly arranged on the upper end of the aeration plate at equal angles, the main reaction pipe is arranged on the upper end of the aeration plate, the air inlet pipe is arranged on one side below the aeration plate, and the bottom discharge pipe is arranged on the other side.

[0015] Furthermore, the sludge conditioning mechanism also includes a first dosing pipe for dosing sludge conditioner and a second dosing pipe for dosing filter aid. The first dosing pipe is arranged at the upper part of the conditioning cylinder, and one end of the first dosing pipe extends into the conditioning cylinder and is connected to the reaction cylinder. The second dosing pipe is arranged at the lower part of the conditioning cylinder, and one end of the second dosing pipe extends into the conditioning cylinder and is connected to the circulation gallery at the bottom. The lower end of the reaction cylinder is formed with a mud outlet hole for the sludge conditioner to pass through. The circulation gallery at the top is connected to the maturation tank through the mud outlet pipe. Several heating rings are equally spaced on the outer coaxial line of the conditioning cylinder, and a temperature sensor is fixed to the lower end of the conditioning cylinder.

[0016] Furthermore, the sludge conditioning mechanism also includes a circulation top plate and four circulation plates. The circulation top plate is arranged inside the conditioning cylinder and is fixedly connected to the inner wall of the conditioning cylinder. The four circulation plates are arranged in an array at equal intervals below the circulation top plate. The upper and lower ends of the bottom circulation plate are fixedly connected to two baffles, and the upper ends of the remaining circulation plates are fixedly connected to two baffles. One side of the baffle is filled with reaction balls, and an upflow hole is formed on the side of the baffle filled with reaction balls, and the upper end of the upflow hole is fixedly connected to a ball baffle plate.

[0017] Furthermore, the maturation mechanism also includes a screw pump and two secondary agitators. The two secondary agitators are symmetrically arranged along the midline of the long side of the maturation tank. The output end of the secondary agitator extends into the interior of the maturation tank. The maturation tank is connected to the plate and frame filter press mechanism through the screw pump.

[0018] A treatment method for a sewage treatment system based on deep dehydration conditioning also includes the following steps:

[0019] S1: The anaerobic sludge in the original thickening tank is pumped into the buffer tank by the main sludge pump, and the buffer tank pre-activates the sludge;

[0020] S2: The pre-activated sludge is introduced into the diversion pipe under the action of the secondary sludge pump. The activation cylinder aerates and oxygenates the sludge through the aeration plate to achieve full mixing and activation of the sludge;

[0021] S3: The fully activated sludge reacts with sludge conditioner and filter aid in the conditioning cylinder through five circulation corridors;

[0022] S4: After the five-stage reaction, the sludge is matured in the maturation tank and then subjected to strong filtration through a plate and frame filter press.

[0023] Compared with the prior art, the present invention has the following beneficial effects:

[0024] One: the device realizes pre-activation by gradient stirring of anaerobic sludge through setting baffles and main stirrers in the buffer pool. Gradient stirring of different buffer cavities can be targeted according to the characteristics of the sludge, effectively breaking the sludge structure, laying a good foundation for subsequent activation, conditioning and other processing links. Compared with traditional simple stirring, the treatability of the sludge is greatly improved, and the overall treatment efficiency is improved.

[0025] Secondly, the device forms a circulating fluidized state of the sludge through the synergistic effect of the flow guide pipe in the activation cylinder, the flow stabilizing cylinder, the circulating sludge collecting groove and other structures, combined with the precise aeration of the aeration plate, which can ensure that the sludge is fully mixed and mass transfer under aerobic conditions. Compared with traditional activation devices, the sludge activation is more sufficient, the activity is improved, which is conducive to the reaction with the conditioning agent and the filter aid, thereby improving the sludge treatment effect.

[0026] Thirdly, the device realizes five-stage reaction of sludge, sludge conditioning agent and filter aid through the setting of five circulating corridors in the conditioning cylinder and reaction balls. The different designs of each corridor and the action of the reaction balls make the reaction gradually in-depth, compared with a single reaction structure, which can more fully occur chemical reaction, effectively reduce the water content of the sludge, and improve the dewatering performance and treatment quality of the sludge. BRIEF DESCRIPTION OF DRAWINGS

[0027] Figure 1 is a perspective structural schematic diagram of an embodiment;

[0028] Figure 2 is a front view of the embodiment;

[0029] Figure 3 is a perspective structural schematic diagram of another angle of the embodiment;

[0030] Figure 4 is a perspective structural exploded schematic diagram of the buffer pool in the embodiment;

[0031] Figure 5 is a perspective structural exploded schematic diagram of the activation cylinder and the conditioning cylinder in the embodiment;

[0032] Figure 6 is Figure 5 an enlarged view of the structure at A in the embodiment;

[0033] Figure 7 is a perspective structural half-section view of the activation cylinder and the conditioning cylinder in the embodiment;

[0034] Figure 8 is Figure 7 an enlarged view of the structure at B in the embodiment;

[0035] Figure 9 is a flow guide schematic diagram of the four riser holes in the embodiment;

[0036] Figure 10is the installation schematic diagram of the reaction ball in the circulation gallery in the embodiment.

[0037] The reference signs in the drawings are:

[0038] 1, original concentration tank; 2, main sludge pump; 3, buffer mechanism; 4, buffer tank; 5, baffle; 6, mud hole; 7, buffer cavity; 8, main agitator; 9, secondary sludge pump; 10, sludge activation mechanism; 11, activation cylinder; 111, ultrasonic liquid level sensor; 12, flow guide pipe; 13, perforated bottom plate; 14, steady flow cylinder; 15, outer expansion part; 16, circulating sludge collection tank; 17, aeration plate; 18, single-hole membrane aerator; 19, main reaction pipe; 20, bottom guide pipe; 21, air inlet pipe; 22, guide pipe; 23, sludge conditioning mechanism; 25, conditioning cylinder; 26, circulation gallery; 27, circulation plate; 28, flow baffle; 29, upflow hole; 30, ball baffle; 31, circulation top disc; 32, heating ring; 33, temperature sensor; 34, first dosing pipe; 35, mud outlet pipe; 36, second dosing pipe; 37, reaction cylinder; 38, secondary agitator; 39, mud outlet hole; 40, reaction ball; 41, curing mechanism; 42, curing tank; 43, secondary agitator; 44, screw pump; 45, plate-and-frame filter press. DETAILED DESCRIPTION

[0039] In order to further understand the features, technical means and specific purposes and functions achieved by the present application, the present application will be described in further detail below in conjunction with the drawings and specific embodiments.

[0040] Reference Figures 1 to 10 , a sewage treatment system based on deep dewatering conditioning, comprising an original concentration tank 1, further comprising:

[0041] The buffer mechanism 3 is arranged beside the original concentration tank 1, the buffer mechanism 3 comprises a buffer tank 4 in communication with the original concentration tank 1 through a main sludge pump 2, a sludge activation mechanism 10 is arranged on the side of the buffer tank 4 away from the original concentration tank 1, the sludge activation mechanism 10 comprises an activation cylinder 11, a flow guide pipe 12 is coaxially arranged in the inside of the activation cylinder 11 and is in communication with the buffer tank 4 through a secondary sludge pump 9 (as shown in Figure 3 , Figure 4 and Figure 5 ), a steady flow cylinder 14 is coaxially arranged on the upper part of the flow guide pipe 12 and is fixedly connected with the upper end of the activation cylinder 11 (as shown in Figure 7 ), an aeration plate 17 is coaxially arranged below the flow guide pipe 12 and is fixedly connected with the lower part of the activation cylinder 11, a sludge conditioning mechanism 23 is arranged on the side of the activation cylinder 11 away from the buffer tank 4, the sludge conditioning mechanism 23 comprises a conditioning cylinder 25 and a reaction cylinder 37 fixedly connected with the conditioning cylinder 25 in a coaxial manner, a secondary agitator 38 is fixedly connected with the upper end of the reaction cylinder 37 (as shown in Figure 5The output end of the auxiliary agitator 38 is arranged downward, and the conditioning cylinder 25 is sequentially formed with five loop flow corridors 26 from bottom to top (as shown in Figure 10 The conditioning cylinder 25 is provided with a curing mechanism 41 away from the activation cylinder 11, and the curing mechanism 41 comprises a curing pool 42 in communication with the conditioning cylinder 25. The curing pool 42 is provided with a plate-and-frame filter press 45 away from the conditioning cylinder 25.

[0042] When the device is in operation, the anaerobic sludge in the original concentration pool 1 is pumped into the buffer pool 4 under the action of the main sludge pump 2. The sludge is pre-activated by gradient agitation in the buffer pool 4, and then the sludge in the buffer pool 4 is guided into the flow guide pipe 12 in the activation cylinder 11 under the action of the secondary sludge pump 9 (as shown in Figure 4 and Figure 7 At this time, the activation cylinder 11 performs aeration on the sludge through the aeration plate 17 to charge oxygen. The sludge rises to the top and then is controlled to descend by the flow stabilizing cylinder 14, thereby forming a circulating fluidized state, ensuring that the sludge is well mixed and mass transfer under aerobic conditions, realizing the full mixing and activation of the sludge. The activated sludge flows into the reaction cylinder 37 of the conditioning cylinder 25. After the sludge is agitated by the auxiliary agitator 38, the sludge passes through the five loop flow corridors 26 from bottom to top (as shown in Figure 10 The sludge, sludge conditioner and filter aid in the loop flow corridor 26 react, and the reaction balls 40 are used to improve the reaction efficiency.

[0043] After the sludge is reacted for five stages, it is cured in the curing pool 42 (as shown in Figure 2 The cured sludge is then introduced into the plate-and-frame filter press 45 for strong pressure filtration. The moisture content of the sludge is reduced from 98% to 99% to about 50% to 55%, and then the sludge is naturally ventilated and dried. The moisture content of the sludge can be reduced to about 30%, which lays a foundation for the comprehensive resource utilization of the dried sludge, such as the production of adsorbent material, building material, peat, or sludge incineration.

[0044] In order to improve the efficiency of sludge treatment, the anaerobic sludge introduced from the original concentration pool 1 is pre-activated by gradient agitation. The specific features are as follows:

[0045] The buffer mechanism 3 further comprises a plurality of main agitators 8 and a plurality of baffles 5. The plurality of baffles 5 are arranged at intervals in the interior of the buffer pool 4 and are fixedly connected with the buffer pool 4 (as shown in Figure 4As shown in the figure, the baffle 5 is provided with a mud passing hole 6, and the adjacent two baffles 5 and the end of the baffle 5 and the buffer tank 4 form a buffer cavity 7, and the upper end of each buffer cavity 7 is provided with a main agitator 8 fixedly connected with the top of the buffer tank 4. In operation, the anaerobic sludge in the original concentration tank 1 is pumped into the buffer tank 4 by the main sludge pump 2, and then flows through each buffer cavity 7 in turn. The main agitator 8 performs gradient agitation on the sludge in each buffer cavity 7, and the agitation intensity and time of different buffer cavities 7 can be set according to requirements (the three main agitators 8 are fast agitator, medium-speed agitator and slow agitator in turn in the direction of sludge flow, thereby realizing gradient agitation of the sludge). Such gradient agitation can gradually realize pre-activation of the sludge under different mixing intensities, and the mud passing hole 6 on the baffle 5 controls the flow path and speed of the sludge, so as to ensure that the sludge can fully receive agitation in the buffer tank 4 and prepare for subsequent sludge activation treatment.

[0046] In order to realize the circulation flow of the sludge, the following features are further provided:

[0047] The lower end of the flow guide pipe 12 is fixedly connected with a perforated bottom plate 13 (as shown in the figure), Figure 8 The outer coaxial line of the flow stabilizing cylinder 14 is provided with a circulating flow sludge collecting groove 16 fixedly connected with the inner wall of the activation cylinder 11 (as shown in the figure), Figure 7 The circulating flow sludge collecting groove 16 is communicated with the reaction cylinder 37 through a conduit 22, and the outer coaxial line of the activation cylinder 11 is arrayed with a plurality of ultrasonic liquid level sensors 111. After the sludge enters the flow guide pipe 12, the perforated bottom plate 13 can play a preliminary flow guiding and dispersing role on the sludge. When the sludge overflows from the top of the flow guide pipe 12 and flows downward under the guidance of the flow stabilizing cylinder 14, part of the sludge will enter the circulating flow sludge collecting groove 16 when the sludge accumulates to the top of the activation cylinder 11. The sludge collected by the circulating flow sludge collecting groove 16 is directly delivered to the reaction cylinder 37 through the conduit 22, which realizes the circulation flow of the sludge in the activation cylinder 11, ensures that the sludge can be in a good mixing and mass transfer state, and reasonably guides the activated sludge to the next processing link. The ultrasonic liquid level sensor 111 can monitor the sludge liquid level height in the activation cylinder 11 in real time, and in combination with the structural characteristics of the internal flow guide pipe 12 and the flow stabilizing cylinder 14, it can be judged whether the sludge circulation is normal. When the liquid level abnormally rises or falls, the system can automatically adjust the flow of the secondary sludge pump 9, so as to ensure that the sludge maintains a reasonable liquid level in the activation cylinder 11, and ensures that the activation process continues stably.

[0048] In order to supplement the detailed structure of the flow stabilizing cylinder 14, the following features are further provided:

[0049] The lower end of the flow stabilizing cylinder 14 is shaped into a horn-shaped outward expansion part 15 with an inclination angle of 135° (as shown in the figure), Figure 7The outer expanding part 15 of the steady flow cylinder 14 can effectively expand the falling area of the sludge and slow down the falling speed of the sludge to avoid the generation of large impact and disturbance when the sludge falls. In this way, the sludge can be smoothly returned to the activation cylinder 11, the stability of the sludge flow in the activation cylinder 11 is maintained, the circulation fluidization process of the sludge in the activation cylinder 11 is smoother, and the activation effect of the sludge is further optimized.

[0050] In order to aerate and oxygenate the sludge in the activation cylinder 11, the following features are further provided:

[0051] The sludge activation mechanism 10 further comprises a main reaction pipe 19, a bottom discharge pipe 20 and an air inlet pipe 21, and a plurality of single-hole membrane aerators 18 are fixed on the equiangular array of the aeration plate 17 (as shown in Figure 8 The upper end of the aeration plate 17 is provided with the main reaction pipe 19 (as shown in Figure 7 The side below the aeration plate 17 is provided with the air inlet pipe 21, and the other side is provided with the bottom discharge pipe 20. After the air inlet pipe 21 is opened, air will be uniformly released into the sludge in the activation cylinder 11 in the form of small bubbles through the single-hole membrane aerator 18, and the dissolved oxygen is controlled within the range of 2-4 mg / L. The main reaction pipe 19 can be used to discharge the sludge in the activation cylinder 11 when it needs to be repaired or cleaned; and the bottom discharge pipe 20 is used to discharge the impurities or sludge deposited at the bottom of the activation cylinder 11. Through the cooperative work of these pipes and aeration devices, the sludge in the activation cylinder 11 can be effectively ensured to be in a good aerobic environment, and full mixing activation can be realized.

[0052] In order to add filter aid for reaction to the conditioning cylinder 25, the following features are further provided:

[0053] The sludge conditioning mechanism 23 further comprises a first adding pipe 34 for adding sludge conditioning agent and a second adding pipe 36 for adding filter aid, and the first adding pipe 34 is arranged at the upper part of the conditioning cylinder 25 (as shown in Figure 5 and Figure 7As shown in the figure, the first dosing pipe 34 is in communication with the reaction cylinder 37 at one end of the conditioning cylinder 25, and the second dosing pipe 36 is arranged at the lower part of the conditioning cylinder 25, with one end of the second dosing pipe 36 extending into the conditioning cylinder 25 in communication with the bottommost annular flow corridor 26. The lower end of the reaction cylinder 37 is shaped with a sludge outlet hole 39 for the sludge conditioner to pass through, and the topmost annular flow corridor 26 is in communication with the maturation tank 42 through the sludge outlet pipe 35. The exterior of the conditioning cylinder 25 is coaxially sleeved with a plurality of heating rings 32 at equal intervals, and the lower end of the conditioning cylinder 25 is fixedly connected with a temperature sensor 33. After the sludge enters the reaction cylinder 37, the first dosing pipe 34 will dose the sludge conditioner into the reaction cylinder 37, and the auxiliary agitator 38 will fully mix and stir the sludge and the conditioner. Subsequently, the sludge flows from bottom to top, and the second dosing pipe 36 doses the filter aid at a suitable position in the lower part of the conditioning cylinder 25, and the filter aid fully contacts and reacts with the sludge in the annular flow corridor 26. The sludge, sludge conditioner and filter aid will flow from the bottommost annular flow corridor 26 to the topmost annular flow corridor 26 in turn, fully reacting the sludge conditioner and filter aid with the sludge, and ensuring that the sludge reaches the desired conditioning effect after five-stage reaction. The temperature sensor 33 is used to monitor the temperature of the bottommost annular flow corridor 26, and when the temperature is abnormal, the conditioning cylinder 25 adjusts the temperature through the heating rings 32 arranged on the outer wall of the conditioning cylinder 25, ensuring the reaction efficiency.

[0054] In order to realize the movement of the sludge from the bottommost annular flow corridor 26 to the topmost annular flow corridor 26, the following features are further provided:

[0055] The sludge conditioning mechanism 23 further comprises an annular flow top disc 31 and four annular flow plates 27. The annular flow top disc 31 is arranged inside the conditioning cylinder 25 and fixedly connected with the inner wall of the conditioning cylinder 25 (as shown in the figure). Figure 5 and Figure 7 The four annular flow plates 27 are arranged in turn at equal intervals below the annular flow top disc 31. The top and bottom ends of the bottommost annular flow plate 27 are fixedly connected with two flow baffles 28, and the upper end of the remaining annular flow plates 27 is fixedly connected with two flow baffles 28. One side of the flow baffle 28 is filled with a reaction ball 40, and one side of the flow baffle 28 filled with the reaction ball 40 is shaped with a rising hole 29, and the upper end of the rising hole 29 is fixedly connected with a ball baffle 30. After the sludge enters the conditioning cylinder 25, it will flow in different annular flow corridors 26 under the guidance of the annular flow plates 27 and the flow baffles 28. The reaction balls 40 filled on the flow baffles 28 can increase the contact area between the sludge, sludge conditioner and filter aid (refer to Figure 5 、 Figure 7 and Figure 10 Among them Figure 5 and Figure 7In order to show the structure and hide the reaction ball 40 in the bottommost ring flow corridor 26, the reaction efficiency is improved. The sludge rises from the next ring flow corridor 26 through the upflow hole 29, and the ball blocking plate 30 can prevent the reaction ball 40 from rising with the sludge, so as to ensure that the reaction ball 40 stably plays a role in each corridor, and the sludge realizes five-stage reaction in the conditioning cylinder 25 from the bottommost to the topmost.

[0056] In order to supplement the specific structure of the maturation mechanism 41, the following features are further provided:

[0057] The maturation mechanism 41 further comprises a screw pump 44 and two secondary agitators 43, which are symmetrically arranged along the center line of the maturation tank 42 (as shown in Figure 3 The output end of the secondary agitator 43 extends into the interior of the maturation tank 42, and the maturation tank 42 is in communication with the plate-and-frame filter press 45 through the screw pump 44. After the sludge activated by the sludge and the sludge conditioned, the two symmetrically arranged secondary agitators 43 will slowly stir the sludge at a speed of 40 r / min, and the stirring time is 30 min. Slow stirring can not only make the sludge fully mixed and uniform in the maturation tank 42, but also will not damage the structure of the sludge. After stirring, the screw pump 44 will transport the matured sludge to the plate-and-frame filter press 45 for strong pressure filtration, so as to ensure that the matured sludge can smoothly enter the next processing procedure and realize effective reduction of the moisture content of the sludge.

[0058] A treatment method of a sewage treatment system based on deep dewatering conditioning, further comprising the following operation steps:

[0059] S1: The anaerobic sludge in the original concentration tank 1 is pumped into the buffer tank 4 under the action of the main sludge pump 2, and the buffer tank 4 performs pre-activation on the sludge;

[0060] S2: The pre-activated sludge is introduced into the flow guide pipe 12 under the action of the secondary sludge pump 9, the activation cylinder 11 performs aeration and oxygenation on the sludge through the aeration plate 17, and the sludge is fully mixed and activated;

[0061] S3: The fully activated sludge is reacted with the sludge conditioning agent and the filter aid in the five ring flow corridors 26 in the conditioning cylinder 25;

[0062] S4: The sludge after five-stage reaction is matured in the maturation tank 42, and then is subjected to strong pressure filtration by the plate-and-frame filter press 45.

[0063] The working principle of the device is that anaerobic sludge in the original concentration tank 1 is pumped into the buffer tank 4 under the action of the main sludge pump 2. The buffer tank 4 is divided into a plurality of buffer cavities 7 by a plurality of baffles 5, and the main agitator 8 performs gradient agitation on the sludge in each buffer cavity 7 to realize pre-activation of the sludge. The pre-activated sludge is transported into the flow guide pipe 12 of the activation cylinder 11 by the secondary sludge pump 9. In the activation cylinder 11, the single-hole membrane aerator 18 on the aeration plate 17 introduces air through the air inlet pipe 21 to aerate and oxygenate the sludge, so that the dissolved oxygen is maintained at 2-4 mg / L, and the sludge is ensured to be in a good aerobic environment. After the sludge rises to the top and overflows, it is lowered under the action of the flow stabilizing cylinder 14. The horn-shaped outward expansion part 15 at the lower end of the flow stabilizing cylinder 14 slows down the sludge descending speed, so that the sludge returns smoothly to form a circulating fluidized state, and the sludge is ensured to be fully mixed and activated.

[0064] The activated sludge enters the reaction cylinder 37 of the conditioning cylinder 25 through the circulating sludge collecting groove 16 and the conduit 22, at this time the first dosing pipe 34 dosing sludge conditioner into the reaction cylinder 37, the secondary agitator 38 fully mixes and agitates the sludge and the conditioner. The mixed sludge enters the five circulating corridors 26 of the conditioning cylinder 25 from bottom to top, the second dosing pipe 36 dosing filter aid at the appropriate position to the lower part of the conditioning cylinder 25, the sludge, sludge conditioner and filter aid in the circulating corridor 26, fully contact with the reaction ball 40 and react, after five-stage reaction, the sludge is fully conditioned.

[0065] The conditioned sludge enters the maturation tank 42, and the two secondary agitators 43 symmetrically arranged in the maturation tank 42 agitate the sludge at a speed of 40 r / min for 30 min to fully mix and uniform the sludge in the maturation tank 42, and complete the maturation process. Finally, the matured sludge is transported to the plate-and-frame filter press 45 by the screw pump 44 for strong pressure filtration, and the moisture content of the sludge is reduced from 98%-99% to about 50%-55%, and then the sludge is naturally ventilated and dried, and the moisture content of the sludge can be further reduced to about 30%, which lays a foundation for comprehensive resource utilization of the sludge.

[0066] The above examples only express one or several embodiments of the present application, and the description is more specific and detailed, but it cannot be understood as a limitation on the scope of the patent of the present application. It should be noted that for ordinary skilled persons in the art, without departing from the concept of the present application, a number of modifications and improvements can be made, which all belong to the protection scope of the present application. Therefore, the protection scope of the patent of the present application should be subject to the appended claims.

Claims

1. A deep de-watering based sewage treatment system comprising a primary concentration tank, characterized in that, Also include: The buffer mechanism is arranged beside the original concentration tank, the buffer mechanism includes the buffer tank communicated with the original concentration tank through the main sludge pump, the side away from the original concentration tank of the buffer tank is provided with the sludge activation mechanism, the sludge activation mechanism includes the activation cylinder, the inside of the activation cylinder is coaxially provided with the flow guide pipe communicated with the buffer tank through the secondary sludge pump, the upper portion of the flow guide pipe is coaxially provided with the steady flow cylinder fixedly connected with the upper end of the activation cylinder, the lower portion of the flow guide pipe is coaxially provided with the aeration plate fixedly connected with the lower portion of the activation cylinder, the side away from the buffer tank of the activation cylinder is provided with the sludge conditioning mechanism, the sludge conditioning mechanism includes the conditioning cylinder and the reaction cylinder fixedly connected with the conditioning cylinder, the upper end of the reaction cylinder is fixedly connected with the secondary agitator, the output end of the secondary agitator is downwardly arranged, the conditioning cylinder is sequentially formed with five circulation corridors from bottom to top, a plurality of reaction balls are arranged in each circulation corridor, the side away from the activation cylinder of the conditioning cylinder is provided with the curing mechanism, the curing mechanism includes the curing tank, the curing tank is communicated with the conditioning cylinder, the side away from the conditioning cylinder of the curing tank is provided with the plate-and-frame filter press. The buffer mechanism further includes a plurality of primary agitators and a plurality of baffles, the baffles are arranged in the interior of the buffer tank at equal intervals and are fixedly connected with the buffer tank, the baffles are provided with mud holes, adjacent two baffles and the end portion of the baffle and the buffer tank form buffer cavities, the upper end of each buffer cavity is provided with a primary agitator fixedly connected with the top of the buffer tank, the primary agitators are sequentially a fast agitator, a medium-speed agitator and a slow agitator in the sludge flow direction, thereby realizing gradient agitation of the sludge. The lower end of the flow guide pipe is fixedly connected with a perforated bottom plate, the exterior of the steady flow cylinder is coaxially provided with a circulation sludge collecting groove fixedly connected with the inner wall of the activation cylinder, the circulation sludge collecting groove is communicated with the reaction cylinder through a conduit, the exterior of the activation cylinder is coaxially arrayed with a plurality of ultrasonic liquid level sensors. The sludge conditioning mechanism further includes a circulation top disc and four circulation plates, the circulation top disc is arranged in the interior of the conditioning cylinder and is fixedly connected with the inner wall of the conditioning cylinder, the four circulation plates are sequentially arrayed at equal intervals below the circulation top disc, the upper and lower ends of the bottommost circulation plate are both fixedly connected with two flow baffles, the upper end of each of the remaining circulation plates is fixedly connected with two flow baffles, one side of the flow baffles is filled with reaction balls, one side of the flow baffles filled with reaction balls is formed with a upflow hole, the upper end of the upflow hole is fixedly connected with a ball blocking plate, the sludge conditioning mechanism further includes a first dosing pipe for dosing sludge conditioning agents and a second dosing pipe for dosing filter aids, the first dosing pipe is arranged at the upper portion of the conditioning cylinder, one end of the first dosing pipe extending into the conditioning cylinder is communicated with the reaction cylinder, the second dosing pipe is arranged at the lower portion of the conditioning cylinder, one end of the second dosing pipe extending into the conditioning cylinder is communicated with the bottommost circulation corridor, the lower end of the reaction cylinder is formed with a sludge outlet hole for the sludge conditioning agents, the topmost circulation corridor is communicated with the curing tank through a sludge outlet pipe.

2. A deep dewatering based sewage treatment system as claimed in claim 1, wherein, The lower end of the steady flow cylinder is formed with an outward expanding portion in the shape of a horn with an inclination angle of 135°.

3. A deep dewatering based sewage treatment system as claimed in claim 1, wherein, The sludge activation mechanism further includes a main reaction pipe, a bottom discharge pipe and an air inlet pipe, a plurality of single-hole membrane aerators are arrayed at equal angles on the aeration plate, the upper end of the aeration plate is provided with the main reaction pipe, one side below the aeration plate is provided with the air inlet pipe, and the other side is provided with the bottom discharge pipe.

4. A deep dewatering based sewage treatment system as claimed in claim 3, wherein, The outer part of the conditioning cylinder is coaxially sleeved with a plurality of heating rings at equal intervals, and a temperature sensor is fixed to the lower end of the conditioning cylinder.

5. A deep dewatering based sewage treatment system as claimed in claim 1, wherein, The maturation mechanism further comprises a screw pump and two secondary agitators, which are symmetrically arranged along the midline of the long side of the maturation tank, the output ends of the secondary agitators extending into the interior of the maturation tank, and the maturation tank being in communication with the plate-and-frame filter mechanism through the screw pump.

6. A treatment method of a deep dewatering conditioning-based sewage treatment system, comprising the deep dewatering conditioning-based sewage treatment system of claim 1, characterized in that, The method further comprises the following operation steps: S1: anaerobic sludge in the original concentration tank is pumped into the buffer tank under the action of the main sludge pump, and the buffer tank pre-activates the sludge; S2: the pre-activated sludge is introduced into the flow guide pipe under the action of the secondary sludge pump, the conditioning cylinder aerates the sludge through the aeration plate to realize the full mixing and activation of the sludge; S3: the fully activated sludge reacts with sludge conditioning agents and filter aids in the conditioning cylinder through five circulating corridors; S4: the sludge after five-stage reaction is matured in the maturation tank, and then is subjected to strong pressure filtration through the plate-and-frame filter.

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