CN219279609U - Sewage coagulating sedimentation device - Google Patents

Abstract

The utility model relates to a sewage coagulating sedimentation device which comprises an adjusting tank, a coagulating tank and a sedimentation tank which are sequentially communicated, wherein the coagulating tank is used for coagulating sewage by adding a medicament. According to the utility model, the sewage is subjected to coagulation treatment and then is precipitated at the bottom of the precipitation tank, the sludge enters the pressing pipe and is conveyed and pressed by the screw body, the screw body presses and dewaters the sludge while conveying the sludge, so that the water content and the volume of the sludge can be effectively reduced, the volume of a subsequent sludge storage tank can be reduced, the load of conveying and dewatering the subsequent sludge is reduced, and the sludge treatment cost is obviously reduced.

Description

Sewage coagulating sedimentation device

Technical Field

The utility model relates to the technical field of sewage treatment, in particular to a sewage coagulating sedimentation device.

Background

The coagulation process is the most basic and extremely important treatment process in industrial water and domestic sewage treatment, and by adding some medicaments (commonly called coagulants and coagulant aids) into water, particles which are difficult to precipitate in the water can be mutually polymerized to form colloid, and then the colloid is combined with impurities in the water body to form larger floccules. The floccule has strong adsorption force, and can adsorb suspended matters, partial bacteria and soluble matters. The floccule is absorbed, and the volume is increased to sink. Compared with other physical and chemical methods, the method has the advantages of good effluent quality, stable and reliable process operation, economy, practicability, simple and convenient operation and the like, and is widely applied to pretreatment of sewage and advanced treatment of effluent.

However, the removal of sludge generated by coagulation and dosing is a troublesome problem, in general, the sludge is collected by a sludge hopper at the bottom of a sedimentation tank, then stored for a certain period of time, the sludge level of the sedimentation tank is monitored by a sludge level meter, a valve is periodically opened to enable excessive sludge to flow into a sludge storage tank, and the excessive sludge is pumped into a spiral filter press or a sludge belt dehydrator to be dehydrated in the sludge storage tank by a sludge pump and finally sent to a relevant treatment unit for sludge disposal. The sludge treatment mode has some problems that firstly, after the sludge is precipitated, the water content of the sludge is still more than 97%, the occupied volume is large, the sludge is directly discharged into a sludge storage tank through a sludge pump, the volume of the sludge storage tank can be increased, and meanwhile, the sludge pump with large flow is required to be selected, so that the transportation cost can be increased. Further, the larger the volume of the sludge, the higher the load on the sludge dehydrator, and thus the cost of the treatment increases. In order to reduce the disposal cost of sludge, in sewage plants, sludge is usually not dewatered while being treated, but is stored in a sludge storage tank, and dewatering is performed when a certain amount of sludge is reached. The sludge which is not pretreated is directly stored in the sludge storage tank, anaerobic digestion of the sludge can occur when the storage time is too long, and the produced odor can pollute the air, so that the normal life of surrounding residents is affected. Therefore, it is highly necessary to dewater the sludge to reduce its volume before it enters the storage tank, so as to reduce the load on the subsequent equipment.

Disclosure of Invention

In order to solve the problems of high water content, large volume and heavy equipment load of sludge in a sludge storage tank, the utility model provides a sewage coagulating sedimentation device which is used for reducing the water content and the volume of the sludge before the sludge enters the sludge storage tank.

In order to achieve the aim, the utility model provides a sewage coagulating sedimentation device which comprises an adjusting tank, a coagulating tank and a sedimentation tank which are sequentially communicated, wherein the coagulating tank is used for coagulating sewage by adding a medicament.

According to the sewage coagulating sedimentation device provided by the utility model, sewage is coagulated and treated to sediment sludge at the bottom of the sedimentation tank, the sludge enters the pressing pipe and is conveyed and pressed by the screw body, the screw body presses and dewaters the sludge while conveying the sludge, so that the water content and the volume of the sludge can be effectively reduced, the volume of a subsequent sludge storage tank can be reduced, the load of conveying and dewatering the subsequent sludge is reduced, and the sludge treatment cost is obviously reduced.

Drawings

FIG. 1 is a schematic diagram of a sewage coagulating sedimentation device.

The utility model is described in further detail below with reference to the accompanying drawings.

Description of the embodiments

Referring to fig. 1, the sewage coagulating sedimentation device comprises a regulating tank 1, a rapid stirring tank 2, a flocculation tank 3 and a sedimentation tank 4, wherein sewage to be treated firstly enters the regulating tank 1 to be homogenized and homogenized, so that the coagulating sedimentation process is ensured to run stably. The rapid stirring tank 2 and the flocculation tank 3 are jointly called a coagulation tank and are used for adding a reagent to coagulate sewage. The lift pump 5 is connected with the regulating tank 1 and the rapid stirring tank 2 through water pipes, and sewage in the regulating tank 1 is conveyed to the rapid stirring tank 2 through the lift pump 5. The rapid stirring tank 2 is internally provided with a stirrer 6, and the stirrer 6 is preferably a paddle stirrer. The metering pump 11 is connected with the dosing barrel 12 and the rapid stirring pool 2 through a water pipe, and a coagulating agent is placed in the dosing barrel 12, wherein the coagulating agent can be polyaluminium chloride PAC, polymeric ferric sulfate PFS and the like. The metering pump 11 is started, the metering pump 11 inputs the coagulating agent in the dosing barrel 12 into the rapid stirring tank 2, the input amount is preferably 10-50mg/L, the stirrer 6 rapidly stirs in the input process, the rotating speed can reach 100-150r/min, the coagulating agent is fully mixed with sewage, the coagulating agent can form a micelle in the wastewater, and the micelle can be electrically neutralized with colloid substances in the wastewater to form flocculating particle sedimentation. The flocculation tank 3 is communicated with the rapid stirring tank 2 through a water through hole 21, and sewage fully mixed with the coagulating agent flows from the rapid stirring tank 2 to the flocculation tank 3. The flocculation tank 3 is internally provided with a flocculation stirrer 7, and the flocculation stirrer 7 is preferably a frame stirrer and can stir slowly because no intense stirring is needed in the sedimentation process. The adding pump 13 is connected with the flocculation medicine barrel 14 and the flocculation tank 3 through a water pipe, and a flocculating agent is placed in the flocculation medicine barrel 14, and can be an inorganic flocculating agent or polyacrylamide PAM. Starting a dosing pump 13, wherein the dosing pump 13 is used for throwing the flocculant in the flocculation medicine barrel 14 into the flocculation tank 3, the throwing amount is preferably 1-3mg/L, the flocculation stirrer 7 is used for stirring slowly in the throwing process, the rotating speed is preferably 5-10r/min, and the net capturing and destabilization of the particles are realized under the condition of slow stirring. In the rapid stirring tank 2, only fine particles are generated in the sewage, and after the sewage is treated by the flocculation tank 3, the fine particles form larger alum blossom.

The sedimentation tank 4 is communicated with the flocculation tank 3, and sewage in the flocculation tank 3 enters the sedimentation tank 4 to realize mud-water separation. A guide pipe 19 is arranged at the position where the sedimentation tank 4 is communicated with the flocculation tank 3, the outlet of the guide pipe 19 is positioned at the middle part of the sedimentation tank 4, and sewage in the flocculation tank 3 flows to the middle part of the sedimentation tank 4 through the guide pipe 19, so that the sludge sedimentation of the sedimentation tank is facilitated. The middle upper part of the side wall of the sedimentation tank 4 is provided with an overflow weir 8, the bottom is provided with a mud bucket 41, the alum particles generated in the sewage are deposited into the mud bucket 41 due to the large mass, and clear water is reserved outside the sedimentation tank 4 through the overflow weir 8, so that the discharge is achieved. A squeezing pipe 9 is arranged below the sedimentation tank 4, the squeezing pipe 9 is communicated with the bottom of a mud bucket 41, and sludge sediment in the mud bucket 41 enters the squeezing pipe 9. The screw body 91 is arranged in the squeezing pipe 9, the screw body 91 is driven to rotate by the driving mechanism 17, the sludge in the squeezing pipe 9 is conveyed forwards, the sludge is extruded by the screw body 91 in the conveying process, progressive compression dehydration is carried out, and the volume of the sludge is gradually reduced. According to the different sludge treatment capacity, a screw with a shaft with a diameter of 200-300mm can be selected, and the rotating speed is 5-10r/min. The lower part of the squeezing pipe 9 is provided with a water accumulation tank 15, the water accumulation tank 15 is communicated with the squeezing pipe 9, and a blocking net is arranged at a connection port of the water accumulation tank 15 and the squeezing pipe 9 and used for preventing sludge in the squeezing pipe 9 from entering the water accumulation tank 15, and sewage in the squeezing pipe 9 flows into the water accumulation tank 15 to realize mud-water separation. The water accumulation tank 15 is connected with the regulating tank 1 through a water pipe 18, the separated sewage flows back to the regulating tank 1, the waste liquid after the preliminary dehydration of the sludge contains a certain amount of retained medicament, and the waste liquid is conveyed back to the regulating tank, so that the dosage of the subsequent medicament can be reduced. The outlet end of the squeezing pipe 9 is connected with a mud outlet pipe 10, the mud outlet pipe 10 is arranged in an upward inclined mode, so that moisture flows back to the squeezing pipe 9 along the mud outlet pipe 10 under the action of gravity and flows to a water accumulation tank 15 from the squeezing pipe 9, and the mud is discharged from the outlet of the mud outlet pipe 10, so that solid-liquid separation is further enhanced, and the discharged mud is conveyed to a mud storage tank by a pump after being collected.

According to the sewage coagulating sedimentation device provided by the utility model, sewage is coagulated and treated to sediment sludge at the bottom of the sedimentation tank, the sludge enters the squeezing pipe and is conveyed and squeezed by the screw body, the screw body is used for squeezing and dewatering the sludge while conveying the sludge, so that the water content and the volume of the sludge can be effectively reduced, the water content of the sludge can be reduced by 3% -5%, the volume of a subsequent sludge storage tank can be reduced by 20% -30%, and the load of a sludge dehydrator can be reduced after the volume of the sludge storage tank is reduced, thereby reducing the treatment cost of the sludge. After the water content of the sludge is reduced, the sludge is conveyed to a treatment area, a small sludge pump can be selected, and the transportation cost is obviously reduced. The waste liquid after the preliminary dehydration of the sludge contains a certain amount of retained medicament, and the medicament is conveyed back to the regulating tank, so that the adding amount of the subsequent medicament can be reduced.

Claims (7)

1. The utility model provides a sewage coagulating sedimentation device, includes equalizing basin, coagulating basin and the sedimentation tank that communicates in proper order, and the coagulating basin is used for adding the medicament to carry out coagulating treatment to sewage, its characterized in that, the well upper portion position in sedimentation tank is equipped with the overflow weir, and the below of sedimentation tank is equipped with the pipe of squeezing, squeezes the bottom intercommunication of pipe and sedimentation tank, is equipped with the spirochete in the pipe of squeezing, and the spirochete is driven rotatory by actuating mechanism, and the below of squeezing the pipe is equipped with the ponding, ponding and squeezing pipe intercommunication.

2. The sewage coagulating sedimentation device according to claim 1, wherein the outlet end of the squeeze tube is connected to a sludge outlet tube, and the sludge outlet tube is disposed obliquely upward.

3. The sewage coagulating sedimentation device according to claim 2, wherein the coagulating basin comprises a rapid stirring basin and a flocculation basin which are communicated with each other, the rapid stirring basin is communicated with the regulating basin, a stirrer is arranged in the rapid stirring basin, a metering pump is connected with a dosing barrel and the rapid stirring basin through a water pipe, a coagulating agent is placed in the dosing barrel, the flocculation basin is communicated with the sedimentation basin, a flocculation stirrer is arranged in the flocculation basin, a feeding pump is connected with the flocculation barrel and the flocculation basin through a water pipe, a flocculating agent is placed in the flocculation barrel, and the rotation speed of the stirrer is faster than that of the flocculation stirrer.

4. A wastewater coagulating sedimentation device according to claim 3, wherein the agitator is a paddle agitator.

5. The wastewater coagulating sedimentation device of claim 4, wherein the flocculation agitator is a frame agitator.

6. The wastewater coagulating sedimentation device of claim 5, wherein a blocking net is arranged at the connection port of the water accumulation tank and the squeezing tube.

7. The wastewater coagulating sedimentation device of claim 6, wherein the sedimentation basin is connected to the conditioning basin by a water line.

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