CN112374653A - Hydraulic classification separation and fine sand recovery method for treating wastewater from sandstone production - Google Patents
Hydraulic classification separation and fine sand recovery method for treating wastewater from sandstone production Download PDFInfo
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F9/00—Multistage treatment of water, waste water or sewage
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/52—Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F2001/007—Processes including a sedimentation step
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2209/00—Controlling or monitoring parameters in water treatment
- C02F2209/005—Processes using a programmable logic controller [PLC]
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Abstract
本发明公开了一种砂石生产废水处理的液力分级分离与细砂回收方法，属于砂石生产废水处理技术领域。该方法包括以下步骤：(1)细砂液力分离；(2)细砂是否回收判断；(3)污泥液力分离。PLC可以根据细砂和污泥的沉淀分离效果，自动调整沉淀路径，改变液力分离罐组中参与废水处理的级数，及各级液力分离罐组中参与废水处理的分离罐数量，同时控制已开启阀门的开合度，减小废水进入相关分离罐的流量，进一步降低废水在分离罐中的流速，降低废水携带细砂或污泥的能力，提升细砂沉淀回收效果，提升污泥沉淀分离效果，减少污泥排放，灵活性、稳定性好。废水处理后所得清水可以再次用于砂石生产，节约水资源，实现了绿色矿山节能环保的目的。The invention discloses a hydraulic classification separation and fine sand recovery method for treating waste water from sand and gravel production, and belongs to the technical field of waste water treatment from sand and gravel production. The method includes the following steps: (1) hydraulic separation of fine sand; (2) judgment of whether the fine sand is recovered; (3) hydraulic separation of sludge. PLC can automatically adjust the sedimentation path according to the precipitation and separation effect of fine sand and sludge, change the number of stages involved in wastewater treatment in the hydraulic separation tank group, and the number of separation tanks involved in wastewater treatment in the hydraulic separation tank group at all levels. Control the opening and closing degree of the opened valve, reduce the flow of waste water into the relevant separation tank, further reduce the flow rate of waste water in the separation tank, reduce the ability of waste water to carry fine sand or sludge, improve the effect of fine sand precipitation and recovery, and improve sludge precipitation Separation effect, reduce sludge discharge, good flexibility and stability. The clean water obtained after wastewater treatment can be used for sand and gravel production again, saving water resources and realizing the purpose of energy saving and environmental protection in green mines.
Description
Technical Field
The invention relates to a hydraulic classification separation and fine sand recovery method for treating wastewater from sandstone production, belonging to the technical field of wastewater treatment from sandstone production.
Background
In the production process of the artificial sandstone processing system, in order to ensure that the quality of finished aggregate meets the requirements, the aggregate needs to be washed by water, and often, one set of medium-sized sandstone processing system has large water consumption and high water consumption cost. The waste water produced by processing sandstone generally does not contain toxic and harmful substances, has little influence on acid and alkali of water quality, and is mainly characterized by high content of suspended matters, and the concentration of suspended matters (SS) is 50000-160000 mg/L, belonging to high-concentration waste water. In the treatment and recovery process of the waste water produced in the sand-stone production, sand-water separation and fine sand recovery are generally carried out by adopting equipment such as a sand scraper, a screw machine or a spiral-flow thickener.
Chinese patent document with publication number CN101891312A discloses a wastewater treatment process for a large-scale artificial sandstone plant, which adopts the following method for treatment, wastewater generated in the production process of the artificial sandstone plant is subjected to a three-stage water treatment process, a slurry purification device is adopted at the first stage for precipitation and recovery of production wastewater, fine sand with the particle size of 0.08-5 mm in the wastewater is recovered, and the load of a subsequent wastewater treatment facility is reduced; the second stage adopts a vertical flow sedimentation tank, and mainly sediments stone powder and sludge with the grain diameter less than or equal to 0.08mm in the overflow water after the first stage treatment; thirdly, adopting an inclined tube/plate sedimentation tank, and adding a flocculating agent such as polyaluminium chloride or anionic polyacrylamide into a water inlet of the inclined tube/plate sedimentation tank according to the mass ratio of 1: 5000-8000 so as to accelerate the sedimentation of suspended matters which are difficult to precipitate in water in the inclined tube/plate sedimentation tank; and (3) performing solid-liquid separation on stone powder and sludge precipitated in the second-stage and third-stage sedimentation tanks by using a disc type vacuum filter, returning the wastewater separated by the disc type vacuum filter to the second-stage vertical flow type sedimentation tank for circular treatment, and conveying waste residues obtained by wastewater recovery and sludge drying to a waste residue field or for re-ploughing and landfill.
However, the wastewater treatment process has the defects of poor fine sand recovery effect, unstable recovery and poor flexibility.
Disclosure of Invention
In order to solve the technical problem, the invention provides a hydraulic classification separation and fine sand recovery method for treating waste water from sandstone production.
The invention is realized by the following technical scheme:
a hydraulic classification separation and fine sand recovery method for treating wastewater from sandstone production comprises the following steps:
(1) hydraulic separation of fine sand: after primary sedimentation is carried out on sandstone production wastewater through an advection pool, the sandstone production wastewater sequentially flows through a plurality of previous stages of hydraulic separation tank groups, the flow of the wastewater entering a separation tank is regulated and controlled through a PLC according to the sedimentation and separation effect of fine sand, the flow velocity of the wastewater in the separation tank is regulated, so that the capacity of carrying the fine sand by the wastewater is regulated, and the fine sand is precipitated and separated in the separation tanks of the plurality of previous stages of hydraulic separation tank groups;
(2) and (3) judging whether the fine sand is recovered: if the fine sand meets the recovery requirement, entering the next wastewater treatment process, and if the fine sand does not meet the recovery requirement, conveying the fine sand and the wastewater to solid-liquid separation equipment for centralized treatment;
(3) hydraulic separation of sludge: treating and recovering the fine sand separated by precipitation in the step (1) by sand-water separation equipment; the waste water overflowed after the fine sand hydraulic separation flows through a plurality of stages of hydraulic separation tank groups in sequence, the flow of the waste water entering the separation tank is regulated and controlled through the PLC according to the sludge settling separation effect, the flow velocity of the waste water in the separation tank is regulated, so that the sludge carrying capacity of the waste water is regulated, and the sludge is settled and separated in the separation tanks of the plurality of stages of hydraulic separation tank groups.
Be equipped with silt concentration monitor in the knockout drum, silt concentration monitor and PLC electric connection, PLC calculates the silt concentration difference of upper and lower node according to the waste water treatment route, can obtain the sedimentation separation effect of fine sand or mud between two nodes.
In the step (1), according to the fine sand precipitation separation effect, the PLC can control the opening and closing of valves on the connecting pipelines A of the previous hydraulic separation tank groups, adjust the fine sand precipitation path, change the number of stages participating in wastewater treatment in the previous hydraulic separation tank groups and the number of separation tanks participating in wastewater treatment in each hydraulic separation tank group, and the multistage hydraulic separation tank groups participating in wastewater treatment run in parallel or in series, so that the flow of wastewater entering the relevant separation tanks is reduced, the flow rate of the wastewater in the separation tanks is further reduced, and the fine sand precipitation separation effect is improved.
The number of separating tanks participating in wastewater treatment at each stage in the previous hydraulic separating tank groups is gradually increased.
The PLC can control the opening and closing degree of the opened valve on the connecting pipeline A, and adjusts the flow of the wastewater entering the relevant separation tank.
In the step (3), according to the sludge precipitation separation effect, the PLC can control the opening and closing of valves on the connecting pipelines B of the later hydraulic separation tank groups, adjust the sludge precipitation path, change the number of stages participating in wastewater treatment in the later hydraulic separation tank groups and the number of separation tanks participating in wastewater treatment in each hydraulic separation tank group, and the multistage hydraulic separation tank groups participating in wastewater treatment run in parallel or in series, so that the flow of wastewater entering the relevant separation tanks is reduced, the flow rate of wastewater in the separation tanks is further reduced, and the sludge precipitation separation effect is improved.
The number of separating tanks participating in wastewater treatment at each stage in the later plurality of stages of hydraulic separating tank groups is gradually increased, and the number of separating tanks participating in wastewater treatment at each stage is larger than that of separating tanks participating in wastewater treatment at any stage in the previous plurality of stages of hydraulic separating tank groups.
The PLC can control the opening and closing degree of the opened valve on the connecting pipeline B, and adjusts the flow of the wastewater entering the relevant separation tank.
The PLC can control the dosing device to dose the medicament into any separating tank.
The vertical center tube that is equipped with in upper portion of knockout drum, the below of center tube is equipped with the reflecting plate, and the reflecting plate is the toper, and the reflecting plate is connected through the lower extreme of many connecting rods and center tube, is the liquid outlet between center tube lower extreme and the reflecting plate.
The invention has the beneficial effects that:
1. PLC can be according to the fine sand separation effect of deposiing, the fine sand sediment route of automatic adjustment, the progression of participating in waste water treatment in the hydraulic separation jar group of a plurality of grades before changing, and the knockout drum quantity of participating in waste water treatment in the hydraulic separation jar group of each grade, the degree of opening and shutting of valve has been opened on the control connecting line A simultaneously, reduce the flow that waste water got into relevant knockout drum, further reduce the velocity of flow of waste water in the knockout drum, reduce the ability that waste water carried the fine sand, promote fine sand sediment recovery effect, flexibility, stability are good.
2. PLC can be according to the sludge sedimentation separation effect, the automatic adjustment sludge sedimentation route, the progression of participating in waste water treatment in the hydraulic separation jar group of a plurality of grades in back changes, and the knockout drum quantity of participating in waste water treatment in the hydraulic separation jar group of each grade, the degree of opening and shutting of the valve has been opened on the control connecting line B simultaneously, reduce the flow that waste water got into relevant knockout drum, further reduce the velocity of flow of waste water in the knockout drum, reduce the ability that waste water carried mud, promote the sludge sedimentation separation effect, reduce sludge discharge.
3. The PLC can adjust the number of the hydraulic separation tank groups participating in wastewater treatment and the number of the separation tanks participating in wastewater treatment in each hydraulic separation tank group according to requirements, and is favorable for reducing the operation cost of wastewater treatment on the premise of ensuring the fine sand recovery and sludge precipitation separation effects.
4. In the wastewater process, the PLC controls the chemical dosing device to dose chemicals such as flocculating agents into the separation tank, thereby being beneficial to improving the wastewater treatment efficiency and improving the fine sand recovery efficiency and the sludge precipitation separation efficiency.
5. The clear water obtained after the wastewater treatment can be used for sandstone production again, so that water resources are saved; sludge obtained by precipitation separation is pressed into mud cakes by solid-liquid separation equipment and then is treated in a centralized way, so that the aims of energy conservation and environmental protection of green mines are fulfilled.
Drawings
FIG. 1 is a flow diagram of the wastewater and fine sand recovery process of the present invention;
fig. 2 is a schematic view of the structure of the separation tank of the present invention.
In the figure: f is a wastewater flow line, H is a clear water flow line, N is an overflow water flow line, and Y is a dosing pipeline.
Detailed Description
The technical solution of the present invention is further described below, but the scope of the claimed invention is not limited to the described.
As shown in figures 1 and 2, the hydraulic classification separation and fine sand recovery method for treating waste water generated in sand production comprises the following steps:
(1) hydraulic separation of fine sand: after primary sedimentation is carried out on sandstone production wastewater through an advection pool, the sandstone production wastewater sequentially flows through a plurality of previous stages of hydraulic separation tank groups, the flow of the wastewater entering a separation tank is regulated and controlled through a PLC according to the sedimentation and separation effect of fine sand, the flow velocity of the wastewater in the separation tank is regulated, so that the capacity of carrying the fine sand by the wastewater is regulated, and the fine sand is precipitated and separated in the separation tanks of the plurality of previous stages of hydraulic separation tank groups;
(2) and (3) judging whether the fine sand is recovered: if the fine sand meets the recovery requirement, entering the next wastewater treatment process, and if the fine sand does not meet the recovery requirement, conveying the fine sand and the wastewater to solid-liquid separation equipment for centralized treatment; when the fine sand separator is used, after the fine sand is subjected to hydraulic separation for a certain time, the fine sand separated by precipitation is conveyed to the screw machine, then the fine sand is separated by the sand-water separator, and whether the fine sand meets the recovery requirement or not and has the recovery value or not is judged manually according to factors such as the quality, the dirt content, the recovery amount in unit time, the recovery cost and the like of the recovered fine sand. Solid waste is separated by the solid-liquid separation equipment and pressed into mud cakes, then the mud cakes are transported to a waste slag field by vehicles, and the wastewater separated by the solid-liquid separation equipment flows back into the advection pool.
(3) Hydraulic separation of sludge: treating and recovering the fine sand separated by precipitation in the step (1) by sand-water separation equipment; the waste water overflowed after the fine sand hydraulic separation flows through a plurality of stages of hydraulic separation tank groups in sequence, the flow of the waste water entering the separation tank is regulated and controlled through the PLC according to the sludge settling separation effect, the flow velocity of the waste water in the separation tank is regulated, so that the sludge carrying capacity of the waste water is regulated, and the sludge is settled and separated in the separation tanks of the plurality of stages of hydraulic separation tank groups. When in use, the sludge precipitated and separated in the step (3) is conveyed to a solid-liquid separation device for centralized treatment. The sand-water separation equipment comprises a screw machine and a sand-water separator, after the fine sand separated by precipitation is conveyed to the screw machine, the wastewater is lifted to the sand-water separator through the screw machine, the fine sand separated by the sand-water separator is conveyed to a finished sand-rock bin through a conveyor, and the separated wastewater flows back to the advection pool.
Install silt concentration monitor in the knockout drum, silt concentration monitor and PLC electric connection, PLC calculates the silt concentration difference of upper and lower node according to the waste water treatment route, can obtain the sedimentation separation effect of fine sand or mud between two nodes.
In the step (1), according to the fine sand precipitation separation effect, the PLC can control the opening and closing of valves on the connecting pipelines A of the previous hydraulic separation tank groups, automatically adjust the fine sand precipitation path, change the number of stages participating in wastewater treatment in the previous hydraulic separation tank groups and the number of separation tanks participating in wastewater treatment in each hydraulic separation tank group, and the multistage hydraulic separation tank groups participating in wastewater treatment run in parallel or in series, so that the flow of wastewater entering the relevant separation tanks is reduced, the flow rate of the wastewater in the separation tanks is further reduced, and the fine sand precipitation separation effect is improved. When in use, the hydraulic separation tank groups at all levels which do not participate in fine sand sedimentation in the hydraulic separation tank groups at the previous stages automatically and smoothly supplement the hydraulic separation tank groups at the later stages for sludge sedimentation and separation.
The number of separating tanks participating in wastewater treatment at each stage in the previous hydraulic separating tank groups is gradually increased. When the device is used, the number of the separating tanks participating in wastewater treatment in the next-stage hydraulic separating tank group is larger than that of the separating tanks participating in wastewater treatment in the previous-stage hydraulic separating tank group, so that the flow of wastewater entering the next-stage separating tank is smaller than that of wastewater entering the previous-stage separating tank, and the flow velocity of wastewater in the next-stage separating tank is smaller than that in the previous-stage separating tank in unit time, thereby being beneficial to improving the recovery effect of fine sand.
The PLC can control the opening and closing degree of the opened valve on the connecting pipeline A, and adjusts the flow of the wastewater entering the relevant separation tank. Is favorable for improving the recovery effect of the fine sand.
In the step (3), according to the sludge precipitation separation effect, the PLC can control the opening and closing of valves on the connecting pipelines B of the later hydraulic separation tank groups, automatically adjust the sludge precipitation path, change the number of stages participating in wastewater treatment in the later hydraulic separation tank groups and the number of separation tanks participating in wastewater treatment in each hydraulic separation tank group, and the multistage hydraulic separation tank groups participating in wastewater treatment run in parallel or in series, so that the flow of wastewater entering the relevant separation tanks is reduced, the flow rate of the wastewater in the separation tanks is further reduced, and the sludge precipitation separation effect is improved.
The number of separating tanks participating in wastewater treatment at each stage in the later plurality of stages of hydraulic separating tank groups is gradually increased, and the number of separating tanks participating in wastewater treatment at each stage is larger than that of separating tanks participating in wastewater treatment at any stage in the previous plurality of stages of hydraulic separating tank groups. When the device is used, the number of separating tanks participating in wastewater treatment in the next-stage hydraulic separating tank group is larger than that of separating tanks participating in wastewater treatment in the previous-stage hydraulic separating tank group, so that the flow of wastewater entering the next-stage separating tank is smaller than that of wastewater entering the previous-stage separating tank, and the flow velocity of wastewater in the next-stage separating tank is smaller than that in the previous-stage separating tank in unit time, thereby being beneficial to improving the recovery effect of sludge and reducing pollutant discharge.
The PLC can control the opening and closing degree of the opened valve on the connecting pipeline B, and adjusts the flow of the wastewater entering the relevant separation tank. Is beneficial to improving the precipitation separation effect of the sludge.
The PLC can control the dosing device to dose the medicament into any separating tank. When the device is used, the dosing device comprises a dosing room, the dosing room is connected with each separating tank through a dosing pipeline, a valve is installed at a position, close to each separating tank, on the dosing pipeline, a pump is installed on the dosing pipeline, and the pump and the valve are electrically connected with the PLC. Can throw medicament such as flocculating agent to arbitrary knockout drum through PLC control pump and valve to improve fine sand recovery efficiency, fine sand recovery effect, sludge sedimentation efficiency and sludge sedimentation effect.
The vertical center tube that is equipped with in upper portion of knockout drum, the below of center tube is equipped with the reflecting plate, and the reflecting plate is the toper, and the reflecting plate is connected through the lower extreme of many connecting rods and center tube, is the liquid outlet between center tube lower extreme and the reflecting plate. The flow path of the wastewater is changed through the reflecting plate, so that the wastewater is prevented from directly impacting and disturbing fine sand or sludge deposited at the bottom of the tank after entering the separating tank, and the settling separation effect and efficiency of the separating tank are guaranteed. As shown in fig. 2, an overflow groove is circumferentially formed on an inner wall of an upper portion of the separation tank, and an overflow pipe joint is formed at a position corresponding to the overflow groove on the separation tank.
Specifically, after hydraulic separation of sludge, the overflowed wastewater enters a clarifier which is connected with a dosing pipeline. And the clear water obtained after the treatment of the clarifier enters a clear water tank so as to be used in the sandstone production system again, and the residual wastewater after the treatment of the clarifier flows back to the advection tank again.
In conclusion, the hydraulic classification separation and fine sand recovery method for treating waste water from sandstone production, provided by the invention, has the following beneficial effects:
1. PLC can be according to the fine sand separation effect of deposiing, the fine sand sediment route of automatic adjustment, the progression of participating in waste water treatment in the hydraulic separation jar group of a plurality of grades before changing, and the knockout drum quantity of participating in waste water treatment in the hydraulic separation jar group of each grade, the degree of opening and shutting of valve has been opened on the control connecting line A simultaneously, reduce the flow that waste water got into relevant knockout drum, further reduce the velocity of flow of waste water in the knockout drum, reduce the ability that waste water carried the fine sand, promote fine sand sediment recovery effect, flexibility, stability are good.
2. PLC can be according to the sludge sedimentation separation effect, the automatic adjustment sludge sedimentation route, the progression of participating in waste water treatment in the hydraulic separation jar group of a plurality of grades in back changes, and the knockout drum quantity of participating in waste water treatment in the hydraulic separation jar group of each grade, the degree of opening and shutting of the valve has been opened on the control connecting line B simultaneously, reduce the flow that waste water got into relevant knockout drum, further reduce the velocity of flow of waste water in the knockout drum, reduce the ability that waste water carried mud, promote the sludge sedimentation separation effect, reduce sludge discharge.
3. The PLC can adjust the number of the hydraulic separation tank groups participating in wastewater treatment and the number of the separation tanks participating in wastewater treatment in each hydraulic separation tank group according to requirements, and is favorable for reducing the operation cost of wastewater treatment on the premise of ensuring the fine sand recovery and sludge precipitation separation effects.
4. In the wastewater process, the PLC controls the chemical dosing device to dose chemicals such as flocculating agents into the separation tank, thereby being beneficial to improving the wastewater treatment efficiency and improving the fine sand recovery efficiency and the sludge precipitation separation efficiency.
5. The clear water obtained after the wastewater treatment can be used for sandstone production again, so that water resources are saved; sludge obtained by precipitation separation is pressed into mud cakes by solid-liquid separation equipment and then is treated in a centralized way, so that the aims of energy conservation and environmental protection of green mines are fulfilled.
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| CN112960789A (en) * | 2021-02-26 | 2021-06-15 | 中国水利水电第九工程局有限公司 | Zero-discharge sandstone production wastewater treatment system and process |
| CN114166703A (en) * | 2021-12-06 | 2022-03-11 | 上海易清智觉自动化科技有限公司 | Fine sand particle size detection device and method |
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| CN114166703A (en) * | 2021-12-06 | 2022-03-11 | 上海易清智觉自动化科技有限公司 | Fine sand particle size detection device and method |
| CN114166703B (en) * | 2021-12-06 | 2024-02-09 | 上海易清智觉自动化科技有限公司 | Fine sand particle size detection device and method |
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