CN111072186A

CN111072186A - A system and method for cleaning the transport tanker of a commercial concrete mixing station and purifying the station sewage

Info

Publication number: CN111072186A
Application number: CN202010061008.4A
Authority: CN
Inventors: 张文军; 姚一帆; 姚金根; 蔡群荣; 史伟超; 张文彬; 姚邵武
Original assignee: Huzhou Xinkaiyuan Crushed Stones Co ltd; China University of Mining and Technology Beijing CUMTB
Current assignee: Huzhou Xinkaiyuan Crushed Stones Co ltd; China University of Mining and Technology Beijing CUMTB
Priority date: 2020-01-19
Filing date: 2020-01-19
Publication date: 2020-04-28

Abstract

The invention discloses a system for cleaning a transport tanker of a commercial concrete mixing station and purifying sewage from a station. The sewage from a tanker cleaning site enters a sand and gravel separator through a pipeline. The sand and gravel separator separates the sewage from the tanker cleaning site into sand and gravel and muddy water. The muddy water and the sewage from the station enter a bailing pit through a pipeline. A dewatering bucket elevator in the bailing pit transports the bottom flow sediment in the bailing pit back to the sand and gravel separator for re-separation. Overflow from the top of the bailing pit enters a buffer tank. A stirring device in the buffer tank stirs the mud therein. A part of the mud is diverted to a mixing building for reuse through a pipeline as appropriate. The rest of the mud enters a mixing barrel through a pipeline. Another part enters a mixing barrel through a pipeline. An automatic dosing machine is arranged on the mixing barrel. The mixed liquid in the mixing barrel enters a fully automatic filter press through a pipeline to generate filter cake and filtrate. The filtrate enters a circulating water tank through a pipeline. The regenerated circulating water in the circulating water tank returns to the tanker cleaning site through a pipeline and is used for tanker cleaning again. The invention has the advantages of simple structure, reliable process, easy control, high efficiency and environmental protection.

Description

System and method for cleaning commercial concrete mixing plant transportation tank car and purifying station sewage

Technical Field

The invention belongs to the technical field of sewage treatment, and particularly relates to a system and a method for cleaning a commercial concrete mixing plant transportation tank car and purifying station sewage.

Background

Concrete delivery tankers are the primary means of transporting commercial concrete. In order to avoid the consolidation of residual concrete in the concrete transportation tank car, the transportation tank car needs to be cleaned at proper time, the sewage generated after cleaning contains hydraulic materials such as sand stone, cement, mineral admixtures (fly ash, slag powder and the like), the components are contained in the running leakage of the mixing plant and the sweeping sewage to different degrees, and the direct discharge can cause the pollution of peripheral water bodies and the damage of ecological environment; the reuse of all the sewage will cause serious hidden quality troubles. In order to save resources and protect the environment, purification treatment is required. The traditional cleaning of concrete transportation tank cars of mixing plants and sewage purification treatment of stations mostly use a multistage slope sedimentation tank series connection process, the process has the prominent problems of large occupied area of the sedimentation tank, easy clogging, deteriorated sedimentation effect, serious circulation accumulation of fine mud, sand and stone resource loss, poor quality of circulating water, instability, serious secondary pollution and the like, particularly, in the concentrated high-density car washing period, the instant flow of car washing sewage is large, the solid concentration is high, the clarification effect of the multistage sedimentation tank is seriously influenced, and the quality of circulating water cannot be ensured; sediments in the slope sedimentation tank are cleaned by a forklift and a digging machine, so that manpower and material resources are consumed, and the dug sediments are high in moisture and difficult to directly transport, store and utilize; if the sediments in the multistage sedimentation tank are not cleaned in time, the upper water layer of the sedimentation tank is too shallow, the water flow speed is higher, the particles are difficult to settle, the concentration of overflow muddy water is increased, the quality of the circulating water is deteriorated, and the production is seriously influenced; and an automatic detection control system is not adopted in most cases, so that the operation management is extensive, and the addition amount of the medicament and the like are seriously influenced by human factors. The commercial concrete mixing plant transportation tank car cleaning and station sewage purification system provided by the invention provides a set of efficient, reliable and environment-friendly concrete transportation tank car cleaning and station sewage purification regeneration process, and the process system has strong adaptability, high reliability, high circulating water quality, low mud cake moisture and less solid waste discharge.

Disclosure of Invention

In order to solve the problems of a concrete transportation tank car sewage treatment system in the prior art and a multi-stage slope sedimentation tank in a muddy water purification link, the invention provides a system and a method for cleaning a commercial concrete mixing plant transportation tank car and purifying station yard sewage.

In order to achieve the purpose, the invention adopts the technical scheme that:

a commercial concrete mixing station transportation tank car cleaning and station sewage purification system comprises a sand-stone separator, a fishing pit, a dewatering bucket elevator, a buffer pool, a mixing tank, an automatic dosing machine, a full-automatic filter press and a circulating water tank;

sewage at the cleaning part of the tank car enters a sand-stone separator through a pipeline, the sand-stone separator divides the sewage into sand and mud, the mud and station sewage enter a fishing pit through the pipeline, a dewatering bucket elevator in the fishing pit conveys underflow sediment in the fishing pit back to the sand-stone separator for re-separation, the periphery of the top of the fishing pit overflows into a buffer pool, a stirring device in the buffer pool stirs the mud in the buffer pool, a part of the mud is shunted to a stirring building through the pipeline as appropriate, the rest of the mud enters a stirring barrel through the pipeline, an automatic dosing machine is arranged on the stirring barrel, mixed liquid in the stirring barrel enters a full-automatic filter press through the pipeline to generate filter cakes and filtrate, the filtrate enters a circulating water tank through the pipeline, and the regenerated circulating water in the circulating water tank returns to the cleaning part of the tank car through the pipeline and is used for.

Furthermore, the circulating water tank is connected with a replenishing water tank through a pipeline.

Furthermore, a slurry pump is arranged between the buffer pool and the stirring barrel.

Further, a high-pressure pump is arranged between the stirring barrel and the full-automatic filter press.

Furthermore, a water pump is arranged on a water outlet pipeline of the circulating water tank.

Further, the automatic dosing machine adds filter aid agents and/or clear water into the stirring barrel.

A method for cleaning a commercial concrete mixing plant transportation tank car and purifying station yard sewage comprises the following steps:

s1, tank car cleaning: the method comprises the following steps of (1) extracting regenerated circulating water from a circulating water pool by using a water pump to clean a tank car, and supplementing clean water to the circulating water pool from a supplementing water pool;

s2, recovering sand: in the tank car cleaning process, the tank car discharges sewage containing sand, mineral admixture and gel material, the sewage flows into a sand-stone separator through a pipeline, the sand-stone separator recovers sand-stone aggregate, and muddy water is discharged through the pipeline;

s3, purifying mud water: muddy water discharged by the sand-stone separator and station sewage are conveyed to a fishing pit through pipelines for hydraulic classification, wherein: the fishing pit adopts central feeding and overflow around the top, the overflow of the fishing pit enters a buffer pool, and a stirring device is additionally arranged on the buffer pool to prevent the gel material contained in the muddy water from depositing and solidifying;

s4, recycling mud water: the slurry in the buffer pool is divided into two paths, wherein one path appropriately divides the slurry back to the stirring building through a pipeline for direct utilization;

s5, fine mud recovery: and the other path of slurry in the buffer tank is conveyed to a stirring barrel by a slurry pump, the slurry in the stirring barrel is conveyed to a full-automatic filter press by a high-pressure pump, the dehydration and the recovery of fine slurry are realized, the fine slurry generates a filter cake under the action of the full-automatic filter press, and the clarified filtrate is conveyed to a circulating water tank for reuse through a pipeline.

Further, in step S2, the slurry flowing out of the sand-stone separator enters a fishing pit, and the dewatering bucket elevator in the fishing pit continuously fishes out the sediment in the fishing pit, and after gravity dewatering, the sediment is conveyed back to the sand-stone separator for secondary separation, and lost sand-stone particles are recovered.

Further, in the step S5, the stirring barrel is connected with an automatic dosing machine, the flow rate of the muddy water is monitored on line through a flow meter, and the concentration of the muddy water is monitored in real time by using a density sensor; according to the mud water flow and concentration information, a PLC is adopted to add the filter aid agent and/or the clear water into the stirring barrel through an automatic medicine adding machine, and the filter aid agent and/or the clear water are/is fully mixed with the slurry in the stirring barrel and then are conveyed to the full-automatic filter press through a high-pressure pump.

Compared with the prior art, the invention has the following beneficial effects:

the bucket fishing pit is adopted to replace the traditional multistage slope sedimentation tank, so that the real-time discharge of the deposited materials is realized, the floor area of the multistage slope sedimentation tank is reduced, the hydraulic classification effect is improved, and the intermittent defect of the dredging mode of adopting a forklift and a excavator is reduced; the low-concentration sludge-water direct filter pressing process is adopted, so that the sludge-water concentration link is avoided, the process flow is simplified, and the sludge-water purification efficiency and the quality of circulating water are improved; the full-automatic filter press with the filter cloth cleaning function is adopted, so that the labor intensity of workers is greatly reduced; the intelligent and accurate addition of the filter aid improves the adaptability of the muddy water purification system to the number and quality fluctuation of the muddy water to be treated.

The invention is a complete muddy water deep clarification system formed by the cooperation of the concentration on-line monitoring system, the muddy water automatic dosing system and the control system, the automation degree of the treatment process adapted to the system is greatly improved, and the investment of manpower and material resources is greatly reduced. The online concentration monitoring system in the buffer pool comprises a flow meter for measuring flow and a density sensor for measuring concentration, real-time monitoring is carried out on muddy water in the system, the muddy water is fed back to the muddy water automatic dosing system, the automatic dosing of the reagent adding unit is driven by the PLC, and meanwhile real-time correction is carried out. The intelligent and accurate addition of the filter aid improves the adaptability of the muddy water purification system to the number and quality fluctuation of the muddy water to be treated.

The solid-liquid separation adopts a direct filter pressing process, and the direct filter pressing mode not only avoids the concentration link and simplifies the process, but also improves the muddy water purification efficiency and the quality of circulating water; and a full-automatic filter press is adopted, so that the automation degree is high and the filter pressing effect is good.

Drawings

FIG. 1 is a process flow diagram of the purification method of the present invention;

FIG. 2 is a schematic view showing the construction of the purification system of the present invention.

Detailed Description

The present invention will be further described with reference to the following examples.

As shown in figure 1-2, a commercial concrete mixing plant transportation tank car cleaning and station sewage purification system comprises a sand-stone separator, a fishing pit, a dewatering bucket elevator, a buffer tank, a mixing tank, an automatic chemical dosing machine, a full-automatic filter press and a circulating water tank, wherein sewage at a tank car cleaning position enters the sand-stone separator through a pipeline, the sand-stone separator divides the sewage at the tank car cleaning position into sand stone and mud water, the mud water and the station sewage enter the fishing pit through pipelines, the dewatering bucket elevator in the fishing pit backwashes bottom flow in the fishing pit to the sand-stone separator for re-separation, the periphery of the top of the fishing pit overflows into the buffer tank, a stirring device in the buffer tank stirs the mud therein, then the mud is divided into two paths, one path is divided into a stirring building through a pipeline for recycling, the other path enters the mixing tank through a pipeline, the automatic chemical dosing machine is arranged, the mixed liquid in the stirring barrel enters the full-automatic filter press through a pipeline to generate filter cakes and filtrate, the filtrate enters the circulating water tank through the pipeline, and the regenerated circulating water in the circulating water tank returns to the tank car cleaning position through the pipeline and is used for cleaning the tank car again.

Preferably, the circulating water tank is also connected with a replenishing water tank through a pipeline; a slurry pump is arranged between the buffer pool and the stirring barrel; a high-pressure pump is arranged between the stirring barrel and the full-automatic filter press; a water outlet pipeline of the circulating water tank is provided with a water pump; and adding a filter aid medicament and/or clear water into the stirring barrel by the automatic medicine adding machine.

s1, tank car cleaning: the tank car is cleaned by pumping the regenerated circulating water from the circulating water pool by a water pump, and clear water resources are saved by supplementing clear water to the circulating water pool from the supplementing water pool;

s2, recovering sand: in the process of cleaning the tank truck, the tank truck discharges sewage containing sand, mineral blends and gel materials, the sewage flows into a sand-stone separator through a pipeline, the sand-stone separator recovers sand-stone aggregates, sand-stone resources are saved, and muddy water is discharged through the pipeline;

s3, purifying mud water: muddy water discharged by the sand-stone separator and station sewage are conveyed to a fishing pit through pipelines for hydraulic classification, wherein: the fishing pit adopts central feeding, the periphery of the top overflows, the overflow of the fishing pit enters a buffer pool, a stirring device is additionally arranged on the buffer pool to prevent gel materials (cement, mineral powder, fly ash and the like) contained in the muddy water from depositing and solidifying, a dewatering bucket elevator is arranged inside the fishing pit, the muddy water flowing out of the sand-stone separator enters the fishing pit, the dewatering bucket elevator in the fishing pit continuously fishes out the precipitate in the fishing pit, and the precipitate is conveyed back to the sand-stone separator for secondary separation after gravity dewatering, lost sand-stone particles are recovered, waste of sand-stone resources is reduced, and adverse effects of coarse particles on subsequent operation are reduced;

s4, recycling mud water: the slurry in the buffer pool is divided into two paths, wherein one path of the slurry flows back to the stirring building through a pipeline in a shunting way for direct utilization; specifically, according to the production condition of the mixing plant, partial mud water in the mud water buffer tank can be appropriately returned to the mixing plant for direct utilization, so that not only can clear water resources be saved, but also the waste of gel materials and the discharge of solid wastes can be reduced, and the mud water amount entering the subsequent operation can be reduced;

s5, fine mud recovery: the other path of slurry in the buffer tank is conveyed to a stirring barrel by a slurry pump, the slurry in the stirring barrel is conveyed to a full-automatic filter press by a high-pressure pump, the dehydration and the recovery of the fine slurry are realized, the fine slurry generates a filter cake under the action of the full-automatic filter press, and the filter cake has low water content and is easy to store, transport, handle and utilize; the direct filter pressing mode is adopted, so that the concentration link is avoided, the process is simplified, and the muddy water purification efficiency and the quality of circulating water are improved; conveying the clear filtrate to a circulating water tank through a pipeline for reuse; the mixing tank is connected with an automatic dosing machine, the filter aid agent and/or the clear water are added into the mixing tank through the automatic dosing machine, and the filter aid agent and/or the clear water are fully mixed with the slurry in the mixing tank and then conveyed to the full-automatic filter press through the high-pressure pump.

As a preferred mode, the dehydration bucket elevator is installed in a bailing pit, the bailing pit adopts central feeding and peripheral overflow at the top, precipitates in the bailing pit are dehydrated through the installed dehydration bucket elevator by gravity, and then conveyed back to the sand-stone separator for secondary separation, lost sand-stone particles are recovered, waste of sand-stone resources is reduced, adverse effects of coarse particles on subsequent operation are reduced, the dehydration bucket elevator belongs to the prior art, and the dehydration bucket elevator can be directly purchased, installed and used.

As a preferable mode, the stirring barrel is connected with an automatic dosing machine, the flow of the muddy water is monitored on line through a flowmeter, and the concentration of the muddy water is monitored in real time through a density sensor; according to the mud water flow and concentration information, a PLC is adopted to add the filter aid agent and/or the clear water into the stirring barrel through an automatic medicine adding machine, and the filter aid agent and/or the clear water are/is fully mixed with the slurry in the stirring barrel and then are conveyed to the full-automatic filter press through a high-pressure pump. In particular, the automatic dosing machine may employ an automatic dosing apparatus: monitoring the flow of the muddy water on line by using a flowmeter, and monitoring the concentration of the muddy water in real time by using a density sensor; and (3) according to the mud water flow and concentration information, the PLC is adopted to automatically regulate and control the addition amount of the filter aid medicament in real time. And the effect of fully mixing the muddy water and the medicament is achieved through the medicament dispersing device. The system can adopt a complete muddy water deep clarification system formed by the cooperation of an online concentration monitoring system, a muddy water automatic dosing system and a control system, the automation degree of the treatment process adaptive to the system is greatly improved, and the investment of manpower and material resources is greatly reduced. The online concentration monitoring system in the buffer pool comprises a flow meter for measuring flow and a density sensor for measuring concentration, real-time monitoring is carried out on muddy water in the system, the muddy water is fed back to the muddy water automatic dosing system, the automatic dosing of the reagent adding unit is driven by the PLC, and meanwhile real-time correction is carried out. The intelligent and accurate addition of the filter aid improves the adaptability of the muddy water purification system to the number and quality fluctuation of the muddy water to be treated. The technical scheme is that a flowmeter for measuring flow and a density sensor for measuring concentration are installed in a buffer pool, the muddy water condition in the system is monitored in real time and fed back to an automatic water feeding system, a medicament adding unit is driven by a PLC to automatically feed medicaments, and meanwhile real-time correction is carried out. These are all existing hardware modules, and only need to be purchased and installed directly.

The above description is only of the preferred embodiments of the present invention, and it should be noted that: it will be apparent to those skilled in the art that various modifications and adaptations can be made without departing from the principles of the invention and these are intended to be within the scope of the invention.

Claims

1. a commercial concrete mixing station transport tanker cleaning and station sewage purification system, is characterized in that, comprises sand and gravel separator, fishing pit, dewatering bucket elevator, buffer tank, mixing barrel, automatic dosing machine, fully automatic Filter press, circulating pool;

The sewage from the tanker washing place enters the sand and gravel separator through the pipeline, and the sand and gravel separator divides the sewage cleaned by the tanker into sand and mud water. The muddy water and station sewage enter the fishing pit through the pipeline, and the dewatering bucket elevator in the fishing pit The bottom flow sediment in the fishing pit is transported back to the sand and gravel separator for re-separation, and the top of the fishing pit overflows into the buffer tank. The stirring device in the buffer tank stirs the mud in it, and diverts a part of the mud through the pipeline to the agitation. The remaining mud enters the mixing tank through the pipeline. An automatic dosing machine is installed on the mixing tank. The mixed liquid in the mixing tank enters the automatic filter press through the pipeline to generate filter cake and filtrate. The filtrate passes through The pipeline enters the circulating water pool, and the regenerated circulating water in the circulating water pool returns to the tanker cleaning place through the pipeline, and is used for tanker cleaning again.

2 . The tank truck cleaning and station sewage purification system for a commercial concrete mixing station according to claim 1 , wherein the circulating water tank is also connected with a supplementary water tank through a pipeline. 3 .

3 . The tank truck cleaning and station sewage purification system for a commercial concrete mixing station according to claim 1 , wherein a mud pump is arranged between the buffer tank and the mixing barrel. 4 .

4 . The tank truck cleaning and station sewage purification system for a commercial concrete mixing station according to claim 1 , wherein a high-pressure pump is arranged between the mixing barrel and the automatic filter press. 5 .

5 . The tank truck cleaning and station sewage purification system for a commercial concrete mixing station according to claim 1 , wherein a water pump is provided on the water outlet pipeline of the circulating water pool. 6 .

6 . The tank truck cleaning and station sewage purification system for a commercial concrete mixing station according to claim 1 , wherein the automatic dosing machine adds filter aids and/or clean water to the mixing drum. 7 .

7. The method for cleaning the transport tanker of a commercial concrete batching plant and the system for purifying the sewage at the station according to any one of claims 1-6, characterized in that, comprising:

S1. Tanker cleaning: use a water pump to extract regenerated circulating water from the circulating water tank to clean the tanker, and replenish the circulating water tank with clean water from the supplementary water tank;

S2. Recycling of sand and gravel: During the cleaning process of the tanker, the tanker discharges sewage containing sand, mineral admixtures and gel materials, and the sewage flows into the sand and gravel separator through the pipeline, and the sand and gravel separator carries out the sand and gravel aggregate. Recovery, the muddy water is discharged through the pipeline;

S3. Slurry water purification: The muddy water and station sewage discharged from the sand and gravel separator are transported to the fishing pit for hydraulic classification through pipelines. A stirring device is added on the buffer pool to prevent the gel material contained in the muddy water from depositing and solidifying;

S4. Mud and water reuse: The mud in the buffer tank is divided into two paths, one of which is shunted back to the mixing building through the pipeline for direct use;

S5. Fine mud recovery: The other mud in the buffer tank is transported to the mixing barrel by the mud pump, and the mud in the mixing barrel is transported to the automatic filter press by the high-pressure pump to realize the dehydration and recovery of the fine mud. Under the action of the machine, the fine mud is formed into a filter cake, and the clarified filtrate is transported to the circulating pool through the pipeline for reuse.

8. The method for cleaning the tanker of a commercial concrete batching station and purifying the station sewage system according to claim 7, characterized in that, in the step S2, the muddy water flowing out of the sand and gravel separator enters the fishing pit, and in the fishing pit The dewatering bucket elevator continuously picks up the sediment in the fishing pit, and after gravity dehydration, it is transported back to the sand and gravel separator for re-sorting, and the lost sand and gravel particles are recovered.

9. The method of claim 7, characterized in that, in the step S5, the mixing tank is connected with an automatic dosing machine, and the flowmeter is online To monitor the flow of mud water, the density sensor is used to monitor the concentration of mud water in real time; according to the information of mud water flow and concentration, PLC is used to add filter aids and/or clean water to the mixing tank through an automatic dosing machine, and add filter aids and/or clean water to the mixing tank. After the mud in the mixing tank is fully mixed, it is transported to the automatic filter press by the high pressure pump.