CN105110455B - Batch (-type) Biological Sand Filtration processing system - Google Patents

Abstract

The invention discloses an intermittent biological sand filter treatment system, comprising: a water storage container communicates with two upper water inlet tanks respectively through a water inlet system, and the water outlets of each upper water inlet tank are separately arranged in each upper part through pipelines. The water inlet at the upper end of the biological sand filter device under the water inlet tank is connected, and the outlet at the lower end of each biological sand filter device is respectively connected with the clear water pool through pipelines; each biological sand filter device is provided with a porous cloth between the water inlet and the packing layer. Water plate; automatic control system, which is connected by the control device, the control valves set on each pipeline, and the low and high water level control gauges set in the upper water inlet tanks. Cycle, control the automatic replenishment of each upper water inlet tank, intermittent operation, overflow prevention and control the drainage of each biological sand filter device. Compared with the biological sand filter, the intermittent biological sand filter treatment system improves cellar water treatment efficiency by 25-40%, and the maintenance period is extended from 2-5 months to 1.0-1.25 years.

Description

Intermittent biological sand filter treatment system

technical field

The invention relates to the field of cellar water biological purification treatment, in particular to an intermittent biological sand filter treatment system.

Background technique

At present, in the arid regions of Northwest my country, rainwater is an important domestic water resource, and rainwater is collected in water cellars for crop irrigation, livestock citation and human drinking water. However, the cellar water is collected from the natural surface and stored for a long time. The water quality indicators such as organic matter, turbidity, color, ammonia nitrogen, and microorganisms in the cellar water exceed the standard or exceed the standard seriously. People drink untreated or simply heated cellar water for a long time. People's health has plagued the development of Northwest China and the improvement of people's living standards.

Biological sand filtration technology has broad application prospects in purifying cellar water in arid areas in Northwest China due to its advantages of low equipment cost, low investment, simple operation without complex technology, low operating cost without dosing chemicals, etc. However, the bio-sand filtration technology has disadvantages such as long film-forming period, continuous and uninterrupted operation, low treatment efficiency, short operation cycle, frequent maintenance, complex maintenance operations and shutdown, etc., which restricts the practical application of bio-sand filtration technology.

Contents of the invention

Based on the problems existing in the above-mentioned prior art, the present invention provides an intermittent biological sand filter treatment system, which can solve the problems of long film-hanging period and continuous non-stop operation in the traditional biological sand filter technology applied to purify the water quality of rainwater cellars. Intermittent, low processing efficiency, short operating cycle, frequent maintenance, complex maintenance operations and need to shut down.

In order to solve the above technical problems, the present invention provides an intermittent biological sand filter treatment system, comprising:

The water storage container is respectively connected with the two upper water inlet tanks through the water inlet system, and the water outlets of the two upper water inlet tanks are respectively connected with the water inlets at the upper end of the biological sand filter device arranged under each upper water inlet tank through pipelines. connected, the drains at the lower ends of the two biological sand filter devices are respectively connected to the clear water pool through pipelines;

Each of the biological sand filter devices is provided with a porous water distribution plate between the water inlet and the packing layer;

The automatic control system is composed of control devices, control valves on each pipeline, and low and high water level control gauges in each upper water inlet tank. The control device communicates with the control valves on each pipeline and each upper part. The low and high water level controllers in the water tank and the electrical connections of the water pumps of the water inlet system can control the automatic water replenishment, intermittent operation, overflow prevention and Control the drainage of each biological sand filter device.

The beneficial effects of the present invention are: by setting two upper water inlet tanks connected to the water storage container and two biological sand filter devices with the two upper water inlet tanks respectively, and cooperating with the automatic control system, a parallel two-way biological sand filter is formed. The device operates intermittently, the filling layer of the first biological sand filter device is shut down and exposed to the air for full reoxygenation, and the second biological sand filter device operates normally. This intermittently operated treatment system will increase the treatment efficiency of cellar water by 25~ 40%; the intermittent operation treatment system can not only eliminate the substandard effluent water quality during the maintenance period, but also extend the maintenance period from 2 to 5 months to 1.0 to 1.25 years; set porous water distribution plates in each biological sand filter device, The cellar water in the upper water tank splashes freely on the porous water distribution plate, which not only achieves the effect of uniform water distribution, but also serves the purpose of oxygenating the cellar water, increasing the oxygen content of the influent water, and shortening the time of each biological sand. The film hanging cycle of the filter device improves the operating efficiency.

Description of drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the following will briefly introduce the accompanying drawings that need to be used in the description of the embodiments. Obviously, the accompanying drawings in the following description are only some embodiments of the present invention. For Those of ordinary skill in the art can also obtain other drawings based on these drawings on the premise of not paying creative efforts.

Fig. 1 is a schematic structural diagram of the intermittent biological sand filtration treatment system provided by the embodiment of the present invention.

detailed description

The following clearly and completely describes the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only some of the embodiments of the present invention, but not all of them. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the protection scope of the present invention.

As shown in Figure 1, the embodiment of the present invention provides an intermittent biological sand filter treatment system, which can improve the treatment efficiency of cellar water, including:

The water storage container 7 communicates with the two upper water inlet tanks 1, 14 respectively through the water inlet system 10, the water storage container 7 is preferably a water cellar or a water tank, and the water outlets of the two upper water inlet tanks 1, 14 are connected to each other through pipelines respectively. The water inlets at the upper ends of the biological sand filter devices 12 and 13 respectively located under the upper water inlet tanks are connected, and the outlets at the lower ends of the two biological sand filter devices 12 and 13 are respectively connected with the clear water pool 6 through pipelines;

Each biological sand filter device is provided with a porous water distribution plate 2 between the water inlet and the packing layer; the porous water distribution plate 2 can be placed above the coarse sand layer 3 of the packing layer, and the distance from the top of the biological sand filter device is 100mm;

The automatic control system 9 is composed of a control device, a control valve separately arranged on each pipeline, and low and high water level controllers 11, 15 arranged in each upper water inlet tank 1, 14, and the control device is connected with the control valve on each pipeline respectively The valve is electrically connected to the low and high water level controllers 11, 15 in each upper water inlet tank 1, 14 and the water pump of the water inlet system 10, and can control each upper water inlet tank according to the water inlet cycle of each upper water inlet tank 1 Automatic water replenishment, intermittent operation, overflow prevention and control of drainage of each biological sand filter device 12,13.

In the above treatment system, the filler in each biological sand filter device consists of a coarse sand layer 3, a fine sand layer 4, and a gravel layer 5 from top to bottom; wherein, the coarse sand layer 3 has a thickness of 10-15 mm, and the fine sand layer 4 The thickness is 750mm, the thickness of the gravel layer 5 is 100-200mm, the fine sand particle size of the fine sand layer 4 is 0.25-0.5mm, the coarse sand particle size of the coarse sand layer 3 is 3-6.5mm, and the gravel particle size of the gravel layer 5 15-25mm. In each biological sand filter device, a layer of 10-15mm coarse sand is laid on the fine sand, which can not only improve the water distribution effect, but also improve the film-hanging efficiency of the filter layer and shorten the formation cycle of the biological layer.

In the above treatment system, the biological sand filter device preferably adopts a biological sand filter column or a biological sand filter tank, and the parallel biological sand filter devices work alternately under the control of the automatic control system, and the height of each biological sand filter device 12, 13 is 1.4-1.8m , the upper end of each biological sand filter device is provided with an overflow hole 8; the overflow hole is set on the biological sand filter device where it is located at a distance of 120mm from the top of the biological sand filter device.

In the above treatment system, the filtration rate of each biological sand filter device is 0.1-0.3m/h, the intermittent operation period is 15-22 days, and the maintenance period is 1.0-1.25 years.

In the above processing system, the shell of each biological sand filter device adopts a transparent shell, which not only facilitates observation of the operating status of the biological sand filter device, but also facilitates sunlight penetration.

In the treatment system of the present invention, after the upper water inlet tank and the biological sand filter device, the intermittent biological sand filter system realizes the intermittent operation of the two biological sand filter devices after two parallel biological sand filter devices normally form a film to form a biological layer. When the first biological sand filter device is shut down, the sand filter layer is exposed to the air for sufficient reoxygenation, and the second biological sand filter device operates normally. The first biological sand filter device empties the water in the column by gravity, and the biofilm and sand materials are exposed to the air for 11 to 18 days, and then runs at a normal filtration rate, and the effluent in the initial 4 to 5 days is passed into the normal operation The second biological sand filter device; after 4 to 5 days, the second biological sand filter device shuts down, and the first biological sand filter device operates normally. Then two parallel biological sand filter devices work intermittently and alternately under the control of the automatic control system. year. The intermittent biological sand filter treatment system improves cellar water treatment efficiency by 25-40%, and the maintenance period is extended from 2-5 months to 1.0-1.25 years. The maintenance method is to replace the 10-30mm fine sand on the upper part of the biological sand filter with new sand. The automatic control system not only controls the automatic water intake of the upper water tank, but also controls the intermittent operation of the parallel biological sand filter device. The control parameters of the automatic control system are adjustable, the operation is convenient, and manpower is saved.

The processing system of the present invention will be further described below in conjunction with specific embodiments.

Intermittent type biological sand filter treatment system of the present invention, its preferred embodiment is:

The intermittent biological sand filter treatment system includes: a water cellar (or water tank) as a water storage container 7, two upper water inlet tanks 1, 14, two parallel biological sand filter devices 12, 13, a clear water tank 6 and automatic control In the system 9, the water storage container 7 communicates with the two upper water inlet tanks 1, 14 respectively through a water inlet system 10 connected by a water pump and a pipeline. The water outlet of the upper water inlet tank 1 directly passes into the biological sand filter column device 12,13, and about 10cm above the porous water distribution plate 2, the biological sand filter device effluent accesses the clean water tank 6 for subsequent use. The automatic control system 9 is communicated with the water pump, the water level controller and the valve.

The packing layer in the biological sand filter device consists of a coarse sand layer 3 with a thickness of 10-15 mm, a fine sand layer 4 with a thickness of 750 mm, and a gravel layer 5 with a thickness of 100-200 mm from top to bottom. The fine sand particle size of the fine sand layer 4 is 0.25-0.5mm, the particle size of the coarse sand 3 is 3-6.5mm, the particle size of the gravel 5 is 15-25mm, and the overflow hole 8 is set 120mm away from the top of the biological sand filter column device , the bottom of each bio-sand filter column device is provided with a drain, and the shells of the bio-sand filter column devices 12, 13 are transparent shells made of transparent materials that are convenient for observing the internal operating state and easy to shine through sunlight.

The above is only a preferred embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any person familiar with the technical field can easily conceive of changes or changes within the technical scope disclosed in the present invention. Replacement should be covered within the protection scope of the present invention. Therefore, the protection scope of the present invention should be determined by the protection scope of the claims.

Claims (8)

1. a kind of batch (-type) Biological Sand Filtration processing system, it is characterised in that including：

Tank (7) is connected with two top inlet water tanks (1), (14) respectively by water inlet system (10), described two tops Inlet water tank (1), (14) delivery port respectively by pipeline with set up separately Biological Sand Filtration device (12) below each top inlet water tank, (13) the water inlet connection of upper end, two Biological Sand Filtration devices (12), (13) lower end discharge outlet respectively by the road with clearly Pond (6) connects；

It is in each Biological Sand Filtration device and porous water distributing plate (2) is provided between water inlet and packing layer；

Filler in described each Biological Sand Filtration device is made up of coarse sands layer (3), fine sand layer (4), gravel layer (5) from top to bottom； The porous water distributing plate (2) is 100mm in the coarse sands layer (3) top, the top in the Biological Sand Filtration device of place；

Robot control system(RCS) (9), by control device and set up the control valve on each pipeline separately and be located at each top inlet water tank (1), (14) low, high water level control meter (11), (15) in are constituted, the control device respectively with each pipeline on control valve and it is each on The water pump that (11), (15) and the water inlet system (10) are counted in low, high water level control in portion's inlet water tank (1), (14) electrically connects Connect, automatic water supplement, the intermittent duty of each top inlet water tank, anti-overflow according to the water inlet cycle of each top inlet water tank (1), can be controlled And control each Biological Sand Filtration device (12), the draining of (13).

2. batch (-type) Biological Sand Filtration processing system according to claim 1, it is characterised in that in the Biological Sand Filtration device Coarse sands layer (3) thickness for 10~15mm, fine sand layer (4) thickness be 750mm, gravel layer (5) thickness be 100~200mm, fine sand The fine sand particle diameter of layer (4) is 0.25~0.5mm, and the coarse sand particle diameter of coarse sands layer (3) is 3~6.5mm, the gravel grain of gravel layer (5) Footpath is 15~25mm.

3. batch (-type) Biological Sand Filtration processing system according to claim 1 and 2, it is characterised in that described two biological sand Filter device (12), (13) are highly 1.4~1.8m, and each Biological Sand Filtration device upper end is equipped with spout hole (8).

4. batch (-type) Biological Sand Filtration processing system according to claim 3, it is characterised in that the spout hole is arranged at institute On Biological Sand Filtration device at 120mm at the top of the Biological Sand Filtration device.

5. batch (-type) Biological Sand Filtration processing system according to claim 1 and 2, it is characterised in that described each biological sand The filtering velocity for filtering device is 0.1~0.3m/h, and the operation resting period is 15~22 days, and maintenance period is 1.0~1.25 years.

6. batch (-type) Biological Sand Filtration processing system according to claim 1 and 2, it is characterised in that described each biological sand The shell for filtering device uses transparent outer cover.

7. batch (-type) Biological Sand Filtration processing system according to claim 1 and 2, it is characterised in that the Biological Sand Filtration dress It is set to：Biological Sand Filtration post or biological sand filter.

8. batch (-type) Biological Sand Filtration processing system according to claim 1 and 2, it is characterised in that the tank (7) It is water cellar or water tank.