A powdered activated carbon dosing system

Abstract

The present invention provides a powdered activated carbon dosing system, comprising: a siphon tube, an activated carbon feeding hole, a pipeline fan, an air duct, a hydraulic agitation pump, a hydraulic agitation inlet pipe, a hydraulic agitation outlet pipe, a dosing pump, an activated carbon dosing pipe, a siphon water replenishing pipe, a siphon water replenishing valve, an activated carbon mixing tank, and a biological tank. It reduces the dust loss after adding powdered activated carbon to the biological tank in a sewage treatment plant, thereby reducing the sewage operation cost and energy consumption. At the same time, it solves the adverse effects of dust flying during the dosing process on human health and the surrounding air.

Description

Technical Field

[0001] The present invention belongs to the technical field of sewage treatment, and particularly relates to a powdered activated carbon dosing system. Background Art

[0002] The powdered activated carbon treatment process (PACT) is a relatively advanced new biochemical wastewater treatment process at present. By adding powdered activated carbon to the biological pool, activated sludge adheres to the surface of the powdered activated carbon. Due to the huge specific surface area and strong adsorption capacity of the powdered activated carbon, the adsorption capacity of the sludge can be effectively improved. In particular, the dissolved oxygen and the concentration of the degradation substrate between the interface of the activated sludge and the powdered activated carbon have been greatly increased, thereby improving the degradation and removal rate of COD and being able to effectively treat toxic and harmful organic pollutants that are difficult to degrade biologically.

[0003] At present, the main ways of adding powdered activated carbon are manual dosing and equipment dosing.

[0004] The manual dosing method means that powdered activated carbon is directly poured into the biological pool manually. Manual dosing will cause uneven dosing of activated carbon, and the dosing interval is stage-wise dosing, which is likely to cause unevenness of powdered activated carbon in the biological pool. Moreover, during the process of adding and using powdered activated carbon, due to the relatively small density of powdered activated carbon, with a density of 0.4 - 0.45 g / cm 3 , it will not do free-fall motion in the air, showing the characteristics of Brownian motion and being insoluble in water. Therefore, tiny powder particle clusters will float around with the change of air flow, resulting in relatively large loss of powdered activated carbon and relatively serious dust pollution. So powder flying will occur during manual dosing, deteriorating the surrounding air environment.

[0005] The equipment dosing methods mainly include dry dosing and wet dosing.

[0006] Dry dosing:

[0007] Dry dosing is also called continuous preparation and mixing dosing process. It is a continuous dosing process that integrates the three processes of preparation, mixing, and dosing by using high-speed jet technology. The powdered solid material metered by a variable-frequency double helix directly enters the mass transfer cavity of the high-speed jet mixer and is instantaneously mixed with the high-speed jet carrier. The powder particles are forced to disperse into the jet carrier during the movement process, becoming a uniform suspension, and are instantaneously dosed into the water medium to be treated.

[0008] Wet dosing:

[0009] This process is also known as the process of preparing powder into suspension and feeding it. According to the different packaging forms of powder materials, the materials are fed into the storage bin by positive-pressure or negative-pressure air conveying; the materials are conveyed to the metering screw by mechanical and air arch-breaking devices at the lower part of the bin. The powder materials metered by the variable-frequency double-screw are fed into the preparation tank with a water mist dust collector through the conveying screw and the powder distributor, together with the prepared water metered by the electromagnetic flowmeter, and stirred and mixed for a certain period of time; the mixed suspension is fed into the water medium to be treated by a screw pump; there is a flushing system at each of the front and back of the screw pump, and the pump and pipeline are flushed regularly during the feeding process or before the feeding ends to prevent the suspension from precipitating in the pipeline and causing pipeline blockage.

[0010] The method of feeding by equipment can effectively solve the problems of dust flying and threats to human health. However, the currently commonly used powder activated carbon feeding equipment has a high price, high power consumption, and high maintenance and repair costs. Especially when applied to the sewage field, it will have a greater impact on the operating costs of sewage treatment plants. Summary of the Invention

[0011] To solve the above technical problems, the present invention provides a powder activated carbon feeding system.

[0012] To provide a basic understanding of some aspects of the disclosed embodiments, a simple summary is given below. This summary part is not a general review, nor is it intended to identify key / important constituent elements or delineate the protection scope of these embodiments. Its sole purpose is to present some concepts in a simple form as a prelude to the detailed description that follows.

[0013] The present invention adopts the following technical solutions:

[0014] In some alternative embodiments, there is provided a powder activated carbon feeding system, including: an activated carbon feeding pipe, a feeding pump, a siphon tube, a biological pool, and a closed activated carbon mixing pool. An activated carbon feeding hole is provided on the activated carbon mixing pool to facilitate the feeding of powder activated carbon; the feeding pump pumps out the mixed liquid in the activated carbon mixing pool and conveys it to the biological pool through the activated carbon feeding pipe; one end of the siphon tube is communicated with the biological pool, and the other end is communicated with the activated carbon mixing pool, siphoning the source water in the biological pool into the activated carbon mixing pool.

[0015] In some alternative embodiments, the powder activated carbon feeding system further includes: a duct fan; the suction port of the duct fan is located above the liquid level of the mixed liquid in the activated carbon mixing pool, and the air outlet of the duct fan is connected to an air duct, and the end of the air duct extends below the liquid level of the source water in the biological pool.

[0016] In some alternative embodiments, the powdered activated carbon dosing system further includes: a hydraulic agitation pump, a hydraulic agitation inlet pipe, and a hydraulic agitation outlet pipe; the outlet of the hydraulic agitation inlet pipe is connected to the inlet of the hydraulic agitation pump, and the inlet of the hydraulic agitation outlet pipe is connected to the outlet of the hydraulic agitation pump; the inlets of the hydraulic agitation inlet pipe and the hydraulic agitation outlet pipe are located on both sides in the activated carbon mixing tank, so as to fully mix and stir the dosed powdered activated carbon with the siphoned water evenly.

[0017] In some alternative embodiments, the powdered activated carbon dosing system further includes: a siphon make-up water pipe and a siphon make-up water valve; the siphon make-up water valve is arranged on the siphon make-up water pipe; one end of the siphon make-up water pipe is communicated with the siphon pipe, and the other end is communicated with the activated carbon dosing pipe. When the pressure of the siphon pipe is insufficient or air enters, the siphon make-up water pipe is used to suck enough water from the activated carbon dosing pipe for supplement.

[0018] In some alternative embodiments, the powdered activated carbon dosing system further includes: a grille; the grille is arranged in the activated carbon feeding hole.

[0019] The present invention has the following advantages compared with the traditional activated carbon dosing method:

[0020] 1. The overall structure is scientific and reasonable. The siphon physical water inlet is adopted, eliminating high-power components such as suction pumps and reducing power consumption. At the same time, the make-up water pipe and the make-up water valve are adopted to effectively make up for the defect that the siphon water absorption method cannot absorb water due to insufficient pressure caused by air intake.

[0021] 2. The powdered activated carbon dosing system of the present invention can dose continuously for 12 hours, without consuming much labor. Only regular inspections are required, and the workload can be included in the daily operation inspections of the sewage treatment plant, saving labor costs.

[0022] 3. The closed activated carbon mixing tank is adopted to solve the problem of air pollution caused by the flying of powdered activated carbon, and at the same time reduce the loss of activated carbon. The powdered activated carbon is dosed through the activated carbon feeding hole, and at the same time, a pipeline fan is set to suck the flying powder in the tank under the liquid level of the biological tank. Multiple measures are taken to reduce the pollution of the surrounding air by the flying powder during the dosing of the powdered activated carbon. The hydraulic agitation pump is used to fully stir and mix the powdered activated carbon and water evenly, preventing the deposition or floating of the activated carbon and reducing the conveying pressure of the dosing pump.

[0023] 4. Reduces the adverse impact on the physical health of dosing personnel. By using an activated carbon mixing tank for dosing, it can be dosed at one time according to the dosing amount for 12 hours. Only manual supplementary dosing of powdered activated carbon is required once a day. There is an activated carbon feeding hole to limit the flying area of the powdered activated carbon during dosing. At the same time, a pipeline fan is used to adjust the flying powder, minimizing the adverse health impact of the flying powder on the dosing personnel and ensuring the safety and health of the dosing personnel.

[0024] 5. Saves the cost of chemical dosing. The activated carbon mixing tank adopts a variety of measures to limit the flying of powder, maximizing the suppression of the flying loss of powdered activated carbon, effectively improving the utilization rate of powdered activated carbon, and reducing the actual dosing loss of powdered activated carbon.

[0025] 6. Comprehensively reduces the actual operating cost of the sewage treatment plant. By reducing power consumption, labor costs, and chemical costs, the operating cost of the sewage treatment plant is further reduced, saving energy. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 is a schematic structural diagram of a powdered activated carbon dosing system of the present invention;

[0027] Figure 2 is a process flow diagram of a powdered activated carbon dosing system of the present invention. DETAILED DESCRIPTION OF THE INVENTION

[0028] The following description and drawings fully disclose the specific embodiments of the present invention, enabling those skilled in the art to practice them. Other embodiments may include structural, logical, electrical, process, and other changes. The examples only represent possible variations. Unless explicitly required, individual components and functions are optional, and the order of operations may vary. Parts and features of some embodiments may be included in or replaced by parts and features of other embodiments.

[0029] As Figure 1 and 2 shown, in some illustrative embodiments, a powdered activated carbon dosing system for the PACT process in sewage treatment is provided to reduce the dust loss after dosing powdered activated carbon in the biological tank of the sewage treatment plant, thereby reducing the sewage operation cost, reducing energy consumption, and at the same time solving the adverse impact of dust flying during the dosing process on personal health and the surrounding air. The powdered activated carbon dosing system of the present invention includes: a siphon tube 1, an activated carbon feeding hole 2, a pipeline fan 3, an air duct 4, a hydraulic mixing pump 5, a hydraulic mixing inlet pipe 6, a hydraulic mixing outlet pipe 7, a dosing pump 8, an activated carbon dosing pipe 9, a siphon water replenishing pipe 10, a siphon water replenishing valve 11, an activated carbon mixing tank 12, and a biological tank 14.

[0030] The activated carbon mixing tank 12 is externally enclosed, only leaving some pipe holes connected to various pipes, and an activated carbon feeding hole 2 is also opened on the activated carbon mixing tank 12. Activated carbon powder is fed into the activated carbon mixing tank 12 through the activated carbon feeding hole 2. Among them, a grid is arranged in the activated carbon feeding hole 2, and the grid is used to block large sundries that accidentally enter, and improve work safety to prevent foreign objects or workers from falling in.

[0031] The dosing pump 8 pumps out the mixed liquid in the activated carbon mixing tank 12 and transports it to the biological tank 14 through the activated carbon dosing pipe 9. One end of the siphon pipe 1 is connected to the biological tank 14, and the other end is connected to the activated carbon mixing tank 12, siphoning the source water in the biological tank 14 into the activated carbon mixing tank 12. In the present invention, the source water is taken from the biological tank 14 as the mixing water for the powdered activated carbon, and the water intake method is siphoning. It forms a mixed liquid in the activated carbon mixing tank 12 by mixing with the powdered activated carbon fed from the activated carbon feeding hole 2, and is transported to the biological tank 14 through the dosing pump 8 and the activated carbon dosing pipe 9. The dosing pump 8 is used to evenly dose the activated carbon mixed liquid into the biological tank 14 to ensure the activated carbon concentration in the biological tank.

[0032] The suction port of the pipeline fan 3 is located above the liquid level of the mixed liquid in the activated carbon mixing tank 12. The outlet of the pipeline fan 3 is connected to the air duct 4, and the end of the air duct 4 extends below the liquid level of the source water in the biological tank. The flying powder above the liquid level of the mixed liquid in the activated carbon mixing tank 12 is sucked into the biological tank 14 beside the activated carbon mixing tank by the pipeline fan 3. The powdered activated carbon is added through the activated carbon feeding hole 2, and at the same time, the pipeline fan 3 is set to suck the flying powder in the tank into the biological tank liquid surface. Multiple measures are taken to reduce the pollution of the surrounding air by the flying powder during the addition of the powdered activated carbon.

[0033] The water outlet of the hydraulic stirring inlet pipe 6 is connected to the water inlet of the hydraulic stirring pump 5, and the water inlet of the hydraulic stirring outlet pipe 7 is connected to the water outlet of the hydraulic stirring pump 5; the water inlet of the hydraulic stirring inlet pipe 6 and the water outlet of the hydraulic stirring outlet pipe 7 are located on both sides in the activated carbon mixing tank 12. The powdered activated carbon is insoluble in water. Therefore, the hydraulic stirring pump 5 is used for stirring to prevent the deposition of activated carbon. The hydraulic stirring pump 5 draws water from the activated carbon mixing tank 12 through the hydraulic stirring inlet pipe 6 and circulates it to the other side of the activated carbon mixing tank 12 through the hydraulic stirring outlet pipe 7 to form a mixed liquid circulation and stir the activated carbon mixed liquid evenly.

[0034] The siphon water replenishing valve 11 is arranged on the siphon water replenishing pipe 10. One end of the siphon water replenishing pipe 10 is connected to the siphon pipe 1, and the other end is connected to the activated carbon dosing pipe 9. The siphon water replenishing valve 11 is normally closed, and a normally closed bypass valve 15 is arranged on the activated carbon dosing pipe 9.

Claims

1. A powdered activated carbon dosing system, characterized in that, Comprising: An activated carbon dosing pipe, a dosing pump, a siphon pipe, a biological tank and a closed activated carbon mixing tank, and an activated carbon feeding hole is formed in the activated carbon mixing tank; The dosing pump pumps out the mixed liquid in the activated carbon mixing tank and transports it to the biological tank through the activated carbon dosing pipe; one end of the siphon pipe is communicated with the biological tank, and the other end is communicated with the activated carbon mixing tank, siphoning the source water in the biological tank into the activated carbon mixing tank; It further comprises: a siphon water replenishing pipe, a siphon water replenishing valve, a duct fan and a grille; The siphon water replenishing valve is arranged on the siphon water replenishing pipe; one end of the siphon water replenishing pipe is communicated with the siphon pipe, and the other end is communicated with the activated carbon dosing pipe; The suction port of the duct fan is located above the liquid level of the mixed liquid in the activated carbon mixing tank, the air outlet of the duct fan is connected with an air duct, and the end of the air duct extends below the liquid level of the source water in the biological tank; The grille is arranged in the activated carbon feeding hole.

2. The powder activated carbon dosing system according to claim 1, characterized in that, It further comprises: A hydraulic stirring pump, a hydraulic stirring inlet pipe and a hydraulic stirring outlet pipe; the water outlet of the hydraulic stirring inlet pipe is connected with the water inlet of the hydraulic stirring pump, and the water inlet of the hydraulic stirring outlet pipe is connected with the water outlet of the hydraulic stirring pump; the water inlet of the hydraulic stirring inlet pipe and the water outlet of the hydraulic stirring outlet pipe are located on both sides in the activated carbon mixing tank.

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