CN111635098A - Waste water zero discharge process for concrete mixing plant - Google Patents
Waste water zero discharge process for concrete mixing plant Download PDFInfo
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- CN111635098A CN111635098A CN202010521626.2A CN202010521626A CN111635098A CN 111635098 A CN111635098 A CN 111635098A CN 202010521626 A CN202010521626 A CN 202010521626A CN 111635098 A CN111635098 A CN 111635098A
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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
- C02F11/00—Treatment of sludge; Devices therefor
- C02F11/12—Treatment of sludge; Devices therefor by de-watering, drying or thickening
- C02F11/121—Treatment of sludge; Devices therefor by de-watering, drying or thickening by mechanical de-watering
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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
- C02F1/44—Treatment of water, waste water, or sewage by dialysis, osmosis or reverse osmosis
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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
- C02F11/00—Treatment of sludge; Devices therefor
- C02F11/12—Treatment of sludge; Devices therefor by de-watering, drying or thickening
- C02F11/121—Treatment of sludge; Devices therefor by de-watering, drying or thickening by mechanical de-watering
- C02F11/122—Treatment of sludge; Devices therefor by de-watering, drying or thickening by mechanical de-watering using filter presses
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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
- C02F11/00—Treatment of sludge; Devices therefor
- C02F11/12—Treatment of sludge; Devices therefor by de-watering, drying or thickening
- C02F11/121—Treatment of sludge; Devices therefor by de-watering, drying or thickening by mechanical de-watering
- C02F11/127—Treatment of sludge; Devices therefor by de-watering, drying or thickening by mechanical de-watering by centrifugation
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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
- C02F3/00—Biological treatment of water, waste water, or sewage
- C02F3/30—Aerobic and anaerobic processes
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- Hydrology & Water Resources (AREA)
- Environmental & Geological Engineering (AREA)
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- Organic Chemistry (AREA)
- Biodiversity & Conservation Biology (AREA)
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- Separation Using Semi-Permeable Membranes (AREA)
Abstract
The invention provides a zero-discharge treatment process for waste water of a concrete mixing plant, belonging to the field of physical treatment of industrial waste water. Mainly solves the problems of waste water discharge containing concrete particles in a station, dust flying in the station, large mud coating on the ground and dispersed treatment of waste water of a pump truck. The method comprises the steps of collecting slurry, mortar and rain dirt dispersed in a station by a vacuum collection system, concentrating the slurry, lifting the slurry by a slurry pump, separating coarse gravel by using a disc screen, recovering aggregate, performing centrifugal separation, separating fine sand and mud, filtering by using a rigid membrane, and immediately obtaining clear water for recycling; and (4) carrying out filter pressing on the concentrated slurry after centrifugal separation nearby, and outputting a mud cake. The invention solves the problems of rapid conveying and collection of high-concentration and large-particle suspended matters, avoids silting, crusting and blocking of ditches and pipelines, eliminates the phenomenon of mud exposure, directly outputs solid mud cakes, and can greatly improve the resource recycling and ecological civilization level of a mixing plant. The invention is used for the waste water treatment of the concrete mixing plant.
Description
Technical Field
The invention relates to the field of treatment of waste water and dust in concrete industry and material intermediate treatment sites, in particular to a waste water zero discharge process.
Background
In a raw material processing plant represented by a concrete mixing plant, on one hand, along with the input and output of a large amount of logistics and material flow, the problems of vehicle unloading, material stacking, material processing, cleaning of residual materials of special vehicles such as pump trucks, vehicle input and output, site mud, dust flying, rain and sewage discharge and discharge of a large amount of suspended matters exist. The sedimentation of ditches and water channels is very serious due to the discharge of high-concentration suspended matter wastewater, and the problem of central environmental protection of a material processing plant represented by a concrete mixing plant is solved. Secondly, the concrete mixing plant has poor internal view, large mud coating area and long spanning time, and aggregates contained in the waste water need to be recovered, which is also the internal development requirement of the mixing plant.
Usually, a vibrating screen or a drum screen is arranged in a concrete mixing plant to treat the car washing wastewater of a concrete pump truck, part of aggregate is recycled, and the screened mud enters a sedimentation tank and is pumped to a plate-and-frame filter press to filter out mud cakes. Before the slurry is secondarily conveyed to a plate frame for filter pressing, crude particles in a sedimentation tank naturally settle and harden, and the slurry is usually dug by a forklift to be drained and aired.
The stirring station is generally flat, and the slope of the drainage ditch is not enough to avoid a large amount of deposition. Due to the characteristics of concrete, silting of a conveying ditch and blockage of a pipeline frequently occur.
Along with the deepening of environmental protection and ecological concepts, the high-concentration suspended solid wastewater discharged from the concrete mixing plant gradually enters the sewage treatment supervision range, and the cyclic utilization is increasingly becoming a big trend.
From the angle of cyclic utilization, the homogenization and stabilization of the wastewater are technical keys, and the problems of reduction of concrete strength and incontrollable fluidity caused by large fluctuation of the concentration and the total amount of slurry derived from the wastewater exist at present.
Disclosure of Invention
The invention aims to systematically solve the problems of zero discharge of high-concentration suspended matter wastewater of a concrete mixing plant, poor site landscape, poor quality of operation environment and cyclic utilization of wastewater.
In order to achieve the aim, the invention provides a waste water zero discharge treatment process for a concrete mixing plant, which is used for treating waste water in a plant area of the concrete mixing plant and is characterized by comprising six parts, namely rainwater waste water treatment, site cleaning waste water treatment, concrete pump truck washing waste water treatment, and/or tire cleaning waste water, and/or concrete inspection waste water treatment, and/or domestic sewage treatment. Except for domestic sewage treatment, all other wastewater treatment in different parts adopts an overall process of collecting wastewater dispersedly and then carrying out centralized treatment.
The waste water is collected in a vacuum mode and/or conveyed by a slurry pump. The centralized treatment sequentially comprises the processes of disk screen coarse separation, vertical centrifuge fine separation, and/or rigid membrane filtration separation, and filter pressing and mud cake pressing by a filter press.
The vacuum collection mode is as follows:
the method comprises the steps that firstly, vacuum collecting wells are distributed at multiple points and dispersedly in a plant area, sewage is used for collecting rainwater sewage, site cleaning wastewater or concrete inspection wastewater in the plant area, a collecting pipe is inserted into the wells, an automatic valve is connected, and an on-site control box is used for controlling the opening and closing of the valve according to the slurry level.
And secondly, pumping a vacuum tank with a certain volume by using a vacuum pump to form negative pressure, and pumping the slurry into a vacuum separation tank at random through a pipeline communicated with the vacuum collection well. The vacuum tank slurry discharge port is positioned at the lower bottom, and the vacuum pumping port is positioned at the upper top, so that the slurry and the gas in the vacuum tank are separated.
The centralized processing mode is as follows:
firstly, the slurry separated from the vacuum tank enters a buffer hopper through an automatic valve or the slurry conveyed by a dispersed slurry pump and is butted with a first slurry pump. The slurry is lifted to a certain height by the first slurry pump.
And secondly, the slag slurry falls into a disc screen with parallel and staggered rotating discs, the oversize is sand and gravel particles with the particle size larger than the first separation particle size, and the undersize is slurry with stronger fluidity and smaller than the first separation particle size.
And thirdly, introducing the slurry into a vertical rotor centrifugal solid-liquid separator, and carrying out circumferential sinking and concentration on fine particles with the particle size larger than the second separation particle size after the fine particles are separated by centrifugal action. The slurry with low concentration of suspended matter smaller than the second separated particle size is discharged from the center.
And fourthly, the centrifugally separated slurry with the particle size smaller than the second separation particle size is fed into a booster pump. When the second separation particle size meets the production requirement of concrete, the booster pump conveys the slurry to a production line or is connected to a branch wastewater treatment process.
And fifthly, the booster pump inputs the slurry with the grain size smaller than the second separation grain size into the sintered metal microporous filter. The filtered clean water enters a clean water tank and is further either blended into a concrete production system or is partially connected into a tire cleaning system for recycling.
And (2) branching to the step 1, directly transferring the concentrated slurry with the particle size larger than the second separation particle size obtained by separation of the centrifuge into a pressure filter through a valve. Depending on the action of natural water head difference or air pressure in the filter press, water seeps out through the diaphragm to dewater mud in the tank, or accumulates enough suspended particles through repeated mud collection to form solid mud cakes. Finally discharging the solid mud cake.
And (2) branching, separating the filtered fine particle concentrated slurry from the filter, and directly transferring the slurry to a filter press through a valve. Depending on the action of natural water head or air pressure in the filter press, water seeps out through the diaphragm to dewater mud in the tank, or through receiving the mud repeatedly for many times, enough suspended particles are accumulated to form a solid mud cake. Finally discharging the solid mud cake.
The waste water vacuum collection mode can be completely replaced by a pumping mode in the self-dispersed collection well of the slurry pump. The vacuum collection is preferred in view of equipment wear.
Step 1, the concrete pump truck directly pours the cleaning wastewater formed by the cleaning tank body into the first disc screen or the second disc screen which is adjacently arranged. The selected sand and gravel particles with the particle size larger than the first separation particle size directly fall to the ground or are gathered into the spiral conveyer to be conveyed to a preset position. Undersize smaller than the first separation particle size flow and join and are merged into the centrifuge.
And step 2, cleaning concrete vehicles entering and leaving the plant area by a tire cleaning machine, conveying and connecting tire cleaning wastewater to the first disc screen by a second slurry pump, or conveying and connecting to the buffer hopper.
And 3, dividing the domestic sewage into an integrated treatment system, and performing intensified stirring anaerobic treatment, aerobic aeration and constant-flux membrane filtration to obtain reclaimed water which is converged into the divided wastewater treatment process or the clean water tank.
Drawings
FIG. 1 is a schematic diagram of a process flow of zero-discharge treatment of wastewater in a concrete mixing plant according to the invention.
FIG. 2 is a schematic view of a simplified process flow for zero wastewater discharge treatment in a concrete mixing plant according to the present invention.
Description of the reference numerals
Detailed Description
Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings. The embodiments described below with reference to the drawings are exemplary and intended to be illustrative of the present invention and are not to be construed as limiting the present invention.
The first embodiment is as follows:
the concrete mixing plant wastewater zero-discharge treatment process according to the embodiment of the invention is described below with reference to the accompanying drawings. As in fig. 1.
Adopt the vacuum collection system, through the collection well that the multiple spot dispersion was arranged, with the dispersion, the clean sewage in discontinuous place, the rainwater, production link waste water pumps to the vacuum separation jar, rethread sediment stuff pump promotes the sediment to first disk sieve, the grit that is greater than first separation particle size is through the disk transfer, the waterlogging caused by excessive rainfall is to one side, fall into screw conveyer, the undersize thing mud that is less than first separation particle size falls vertical rotor centrifuge thick liquid, under centrifugal action, the particulate matter that is greater than the second separation particle size is concentrated at centrifugal field periphery subside, the particulate matter that is less than the second separation particle size spills over from the centrifugal field center, through the booster pump, with certain pressure input rigid membrane filter, output clear water. The mud settled and concentrated by the centrifuge falls into a filter press through a valve, the valve is closed to filter-press the mud, the mud is repeatedly received and filtered for a plurality of times, and then a block mud cake is formed, and finally the material is discharged. The mud settled and separated from the centrifuge falls into a filter press through a valve and is filtered by pressure, and mud cakes are output.
The concrete pump truck cleaning wastewater is directly poured on the second disc screen, the undersize is gathered into the centrifuge, and the oversize gravel is gathered into the screw conveyor.
The vehicles entering and exiting the mixing station are cleaned by tires, so that the dust on roads in and out can be treated, and the cleaning slurry is conveyed to the first disc screen by the second slurry pump.
The domestic sewage is filtered by the reinforced anaerobic, aerobic and rigid membranes and then is converged into a clean water pipeline.
The technical principle of the invention comprises the following key points:
1) advantages of vacuum Collection
The vacuum collection is a rapid conveying of a solid-liquid-gas three-phase mixing system and is operated intermittently. Each time of suction, the pipelines are cleaned along with the air flow, the abrasion to the pipelines is obvious, and therefore the silting, incrustation and blockage of the pipelines and ditches are eliminated.
The vacuum collection adapts to intermittent material flow, and stones with the same pipe diameter can be sucked and conveyed. Has strong adaptability to materials.
The vacuum collection bears the fluctuation of the pipelines of 2-4 m, almost no special requirements are required for the field, the flat pipe and the upper and lower turning are not affected, and the requirement that the drainage ditch is used for slope placement is omitted.
2) Disc screen for separating gravel
The disk sieve is formed by gaps formed by disks which are distributed in a staggered mode to separate particle sizes, the sieve surface is dynamic, the slurry feeding capacity is high, and gravel can be quickly separated and transferred and free water can be drained.
3) Short process feasibility
The waste water of the concrete mixing plant is high-concentration suspended matter waste water, and a centrifugal separation field is manufactured by a rotor of a vertical rotor centrifugal machine. The output low concentration slurry with the particle size smaller than the second separation particle size and the uniformity can directly enter a concrete mixing system or enter a tire cleaning cycle. If the clear water circulation is needed, the clear water is further conveyed to a filter by a booster pump to be separated.
4) Rigid filtration
The pore diameter of the sintered metal microporous filter element is as small as 0.5 micron, and clear water with turbidity less than 1 can be obtained by filtering the clear liquid after centrifugal sedimentation with the sintered metal microporous filter element. The filter holes are stable and inelastic, the filtered mud membrane is coated on the surface of the filter element, backwashing is easy to flake off, and pores are easy to regenerate.
Example two:
the following describes a simplified concrete mixing plant wastewater zero-discharge treatment process according to an embodiment of the invention with reference to the accompanying drawings. As shown in fig. 2.
The difference from the first embodiment is that no tire cleaning wastewater treatment and domestic sewage treatment are arranged, the recycling of clear water is not required, only qualified slurry circulation is considered, and the method is a wastewater treatment process of a subsection short-process concrete mixing plant.
Advantageous effects
Compared with the prior art, the treatment process for zero discharge of the waste water of the concrete mixing plant has the following beneficial effects:
1) the whole process is carried out in a closed way, no exposed sedimentation tank is available, the opportunity of salvaging, dredging and dredging mud by a forklift is avoided, and the appearance of the station is remarkably upgraded;
2) all wastewater in the station area is not discharged outside any more, so that zero discharge is practically realized;
3) fully recycling the gravel materials;
4) solid mud cakes are produced, so that the solid mud cakes are convenient to store and transport;
5) the arrangement of a collection system is concealed;
6) facilities are centralized and integrated, and the occupied area is small;
7) the tail liquid is stable and uniform, and is convenient for recycling in a mixing plant;
8) the tire cleaning realizes the cleaning with clean water or low-turbidity water, the vehicle cleaning efficiency is improved, and the abrasion of the nozzle is greatly reduced.
Claims (7)
1. A zero discharge treatment process of waste water of a concrete mixing plant is used for treating the waste water of the plant area of the concrete mixing plant and is characterized by comprising six parts, namely rainwater waste water treatment, site cleaning waste water treatment, concrete pump truck washing waste water treatment, and/or tire cleaning waste water, and/or concrete inspection waste water treatment, and/or domestic waste water treatment; except for domestic sewage treatment, all other parts of wastewater treatment adopt an overall process of collecting wastewater dispersedly and then carrying out centralized treatment;
the dispersed wastewater collection mode is vacuum collection and/or slurry pump conveying; the centralized treatment sequentially comprises the processes of disk screen coarse separation, vertical centrifuge fine separation, and/or rigid membrane filtration separation, and filter pressing and mud cake pressing by a filter press.
2. The zero discharge treatment process of waste water of the concrete mixing plant according to claim 1,
the vacuum collection mode is as follows:
firstly, arranging vacuum collecting wells at multiple points in a factory area in a dispersed manner, wherein sewage is used for collecting rainwater sewage, field cleaning wastewater or concrete inspection wastewater in the factory area, inserting a collecting pipe into the wells, connecting an automatic valve, and controlling the valve to be opened and closed by using an on-site control box according to the slurry level;
secondly, pumping a vacuum tank with a certain volume by using a vacuum pump to form negative pressure, and pumping the slurry into a vacuum separation tank at random through a pipeline communicated with a vacuum collection well; the vacuum tank slurry discharge port is positioned at the lower bottom, and the vacuum pumping port is positioned at the upper top, so that the slurry and the gas in the vacuum tank are separated.
3. The zero discharge treatment process of waste water of the concrete mixing plant according to claim 1,
the centralized processing mode is as follows:
firstly, the slurry separated from the vacuum tank enters a buffer hopper through an automatic valve or the slurry conveyed by a dispersed slurry pump and is butted with a first slurry pump; lifting the slurry to a certain height by a first slurry pump;
secondly, the slag slurry falls into a disc screen of parallel and staggered rotating discs, the oversize is sand and gravel particles with the particle size larger than the first separation particle size, and the undersize is slurry with stronger fluidity and smaller than the first separation particle size;
thirdly, guiding the slurry into a vertical rotor centrifugal solid-liquid separator, and carrying out circumferential sinking concentration on fine particles with the particle size larger than the second separation particle size after the fine particles are separated by centrifugal action; the suspended matter low-concentration slurry with the particle size smaller than the second separation particle size is discharged from the center;
fourthly, the centrifugally separated slurry with the particle size smaller than the second separation particle size is connected into a booster pump; when the second separation particle size meets the production requirement of concrete, the booster pump conveys the slurry to a production line or is connected to a sub-part wastewater treatment process;
branching the step 1, directly transferring the concentrated slurry with the particle size larger than the second separation particle size obtained by the separation of the centrifuge into a pressure filter through a valve; water seeps out through a diaphragm in the filter press under the action of natural water head difference or air pressure, so that slurry in the tank is dehydrated, or sufficient suspended particles are accumulated through repeated slurry receiving for many times, and a solid mud cake is formed; finally discharging the solid mud cake.
4. The zero discharge treatment process of waste water of the concrete mixing plant according to claim 2,
the booster pump inputs the slurry with the particle size smaller than the second separation particle size into the sintered metal microporous filter; the filtered clean water enters a clean water tank and is further either blended into a concrete production system or partially connected into a tire cleaning system for recycling;
separating the filtered fine particle concentrated slurry from the filter, and directly transferring the slurry to a filter press through a valve; water seeps out through a diaphragm in the filter press under the action of natural water head difference or air pressure, so that slurry in the tank is dehydrated, or sufficient suspended particles are accumulated through repeated slurry collection for many times, and a solid mud cake is formed; finally discharging the solid mud cake.
5. The zero discharge treatment process of waste water of the concrete mixing plant according to claim 2,
the concrete pump truck directly pours the cleaning wastewater formed by the cleaning tank body into the first disc screen or the second disc screen which is adjacently arranged; the selected sand and gravel particles with the particle size larger than the first separation particle size directly fall to the ground or are gathered into the spiral conveyer to be conveyed to a preset position; undersize smaller than the first separation particle size flow and join and are merged into the centrifuge.
6. The zero discharge treatment process of waste water of the concrete mixing plant according to claim 2,
and (3) cleaning the concrete vehicles entering and leaving the plant area by a tire cleaning machine, and conveying the tire cleaning wastewater to the first disc screen by using a second slurry pump or conveying the tire cleaning wastewater to the buffer hopper.
7. The concrete mixing plant wastewater zero emission treatment process according to one of the claims 3 and 4,
domestic sewage enters an integrated treatment system, and through reinforced stirring anaerobic treatment, aerobic aeration and constant-flux membrane filtration, the obtained reclaimed water is converged into the branch wastewater treatment process or the clean water tank.
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| CN202010521626.2A CN111635098A (en) | 2020-06-05 | 2020-06-05 | Waste water zero discharge process for concrete mixing plant |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113232157A (en) * | 2021-06-03 | 2021-08-10 | 中建西部建设建材科学研究院有限公司 | Waste slurry recycling process and device for mixing plant |
| CN117258587A (en) * | 2023-11-22 | 2023-12-22 | 福建南方路面机械股份有限公司 | Efficient mixing and stirring device and mixing process thereof |
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| CN107970679A (en) * | 2017-11-27 | 2018-05-01 | 张玉唐 | Concrete mixing plant sewage recovering system |
| CN110568142A (en) * | 2019-09-25 | 2019-12-13 | 成都精准混凝土有限公司 | Detection process of concrete wastewater |
| CN110655299A (en) * | 2019-07-17 | 2020-01-07 | 高根树 | Slurry treatment process and system device |
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2020
- 2020-06-05 CN CN202010521626.2A patent/CN111635098A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN102242550A (en) * | 2011-04-06 | 2011-11-16 | 清华大学深圳研究生院 | Vacuum sewage interception system and method which are suitable for erecting pipes coastwise |
| CN107970679A (en) * | 2017-11-27 | 2018-05-01 | 张玉唐 | Concrete mixing plant sewage recovering system |
| CN110655299A (en) * | 2019-07-17 | 2020-01-07 | 高根树 | Slurry treatment process and system device |
| CN110568142A (en) * | 2019-09-25 | 2019-12-13 | 成都精准混凝土有限公司 | Detection process of concrete wastewater |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113232157A (en) * | 2021-06-03 | 2021-08-10 | 中建西部建设建材科学研究院有限公司 | Waste slurry recycling process and device for mixing plant |
| CN117258587A (en) * | 2023-11-22 | 2023-12-22 | 福建南方路面机械股份有限公司 | Efficient mixing and stirring device and mixing process thereof |
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