CN204973155U - Surface water drinking water purifies double -deck advection formula sedimentation tank - Google Patents

Abstract

The utility model discloses a double-layer advection sedimentation tank for surface water drinking water purification. The tank body includes upper and lower layers; The water perforated flower wall is connected with the upper pool body, the lower pool body is equipped with multiple rows of sludge hoppers, and the bottom of each row of sludge hoppers is equipped with a mud discharge pipe, and the upper end of the mud discharge pipe is connected with the mud discharge main pipe; the upper mud discharge area of the pool body The longitudinal slope at the bottom of the pool is not less than 0.01. A single row of sludge hoppers is installed at the bottom of the slope on the right side of the upper mud discharge area. A mud scraper is installed on the upper pool body to remove sludge from the bottom of the upper pool body. Outlet weir, the end of the finger-shaped outflow weir is provided with a water collection main pipe. It overcomes the problem of poor mud discharge caused by the hydrostatic pressure mud discharge in the existing advection sedimentation tank, and solves the problems such as the large floor area of the advection sedimentation tank.

Description

Surface water drinking water purification double layer advection sedimentation tank

technical field

The utility model belongs to the technical field of water supply and drainage engineering, and relates to a double-layer advection sedimentation tank for drinking water purification of surface water, which is suitable for a sedimentation tank for drinking water purification of surface water sources with high turbidity, and is also suitable for a primary sedimentation tank in a sewage treatment system.

Background technique

The sedimentation tank is an indispensable structure in the whole purification system in the drinking water purification project of high turbidity surface water. At present, the types of sedimentation tanks used in the surface water drinking water project are advection type, radial flow type and vertical flow type. Among them, the advection sedimentation tank is the earliest and most widely used mud-water separation structure in waterworks in my country due to its simple structure, good sedimentation effect, stable performance, and strong adaptability to impact loads and temperature changes. However, considering the economy of sludge discharge, most advection sedimentation tanks that use hydrostatic pressure for sludge discharge often have poor sludge discharge due to too low hydrostatic pressure; in addition, advection sedimentation tanks generally occupy a large area and need to be further improved. Sedimentation efficiency to solve the problem of large footprint. These outstanding problems in the advection sedimentation tank are urgently needed to be studied and solved in the development of sedimentation technology.

Utility model content

The purpose of this utility model is to provide a double-layer advection sedimentation tank for surface water drinking water purification, which overcomes the problem of poor mud discharge caused by hydrostatic pressure in the existing advection sedimentation tank, and solves the problem that the advection sedimentation tank occupies a large area. and other problems, the double-layer sedimentation tank can use the hydrostatic pressure of the upper and lower sedimentation areas to realize the smooth discharge of mud in the lower sedimentation area, and the upper sedimentation area can improve the working efficiency of the sedimentation tank by adding mud scraping trucks, thus effectively overcoming the conventional advection. The problem that the sedimentation tank occupies a large area.

The technical scheme adopted by the utility model is a double-layer advection sedimentation tank for surface water drinking water purification. The tank body includes upper and lower layers. The water inlet perforated flower wall on the left side of the interior is connected to the upper pool body, and the lower pool body is equipped with multiple rows of sludge hoppers, and the bottom of each row of sludge hoppers is equipped with a mud discharge pipe, and the upper end of the mud discharge pipe is connected to the mud discharge main pipe; The longitudinal slope of the pool bottom in the upper mud discharge area is not less than 0.01. A single row of sludge buckets is installed at the bottom of the slope on the right side of the upper mud discharge area. A mud scraper is installed on the upper pool to remove sludge from the bottom of the upper pool. A finger-shaped water outlet weir is arranged on the upper right, and a water collection main pipe is arranged at the end of the finger-shaped water outlet weir.

The utility model is also characterized in that the inclination angle of the side wall of the sludge bucket is 60°.

Outlet mains installed on water collection mains.

The water inlet perforated flower wall is built with bricks or concrete blocks, and the parts outside the holes are plastered with cement mortar. The upper and lower water inlet holes of the water inlet perforated flower wall are arranged in a staggered manner, and at the same time, they are 0.3m-0.5m above the sedimentation surface to the pool bottom. The walls have no perforations.

The aspect ratio of the upper sedimentation zone and the lower sedimentation zone of the pool body is not less than 4, and the aspect ratio is not less than 10, and the section of the sedimentation zone gradually expands.

The depth of the groove of the finger-shaped weir is 0.3-0.5m.

The beneficial effects of the utility model are:

1. Simple structure, small footprint, low cost and easy construction. Although the settling tank adopts double-layer arrangement, the structure of the upper and lower settling areas is simple, the civil facilities can be cast-in-place or prefabricated, which is easy to construct, and the mud discharge device is easy to install. The double-layer structure actually expands the settling area, and the total occupied area is small .

2. High precipitation efficiency. High turbidity water first enters the lower sedimentation area, and then enters the upper sedimentation area after sedimentation, which greatly reduces the design load of the upper sedimentation area and ensures good effluent water quality in the upper sedimentation area. On the whole, the sedimentation efficiency is higher.

3. Low energy consumption. The hydrostatic pressure available for sludge discharge in the lower layer of the double-layer sedimentation tank is relatively high, and the sludge discharge is smooth without additional energy consumption.

Description of drawings

Fig. 1 is a schematic plan view of the utility model.

Fig. 2 is a sectional view of plane A-A in Fig. 1 .

Fig. 3 is a sectional view of plane B-B in Fig. 1 .

In the figure, 1-water inlet perforated flower wall; 2-finger-shaped water outlet weir; 3-collection main pipe; 4-water outlet main pipe; 5-mud scraper driving; 6-sludge bucket; slope.

detailed description

The utility model will be described in detail below in conjunction with the accompanying drawings and specific embodiments.

The structure of a double layer advection sedimentation tank for surface water drinking water purification, as shown in Fig. The upper mud discharge area is composed.

Both the upper water intake area and the lower water intake area use the perforated flower wall 1 for water distribution, which plays the role of uniform water replenishment and energy dissipation. The water inlet perforated flower wall 1 is built with bricks or concrete blocks, and the part outside the holes is plastered with cement mortar; the upper and lower water inlet holes of the flower wall are staggered, and at the same time, the wall from 0.3 to 0.5m above the sedimentation surface to the bottom of the pool is not Set holes, the size and number of holes can be adjusted according to the water flow rate, and the flow rate of the control holes is not greater than 0.15-0.2m/s.

In order to obtain a better sludge discharge effect, the lower sludge discharge area adopts multiple rows of sludge hoppers 6 for sludge discharge, and the inclination angle of the side wall of the sludge hopper 6 is 60°. The sludge discharge pipe 7 is set in the sludge hopper 6, and the lower end of the sludge discharge pipe 7 Insert the sludge hopper 6, and the upper end of the sludge discharge pipe 7 is connected with the sludge discharge main pipe, and utilizes the hydrostatic pressure of the upper and lower two layers of pool water to discharge the sludge. The vertical slope i at the bottom of the upper sludge discharge area is not less than 0.01, and a single bucket is used for sludge discharge, that is, a single row of sludge buckets 6 is installed at the bottom of the slope of the upper sludge discharge area, and the sludge is scraped into the upper sludge by the scraper truck 5 Bucket 6 is then sucked and discharged by the sludge pump to realize the sludge discharge operation; the cross-section of the sedimentation zone gradually expands, the flow rate gradually decreases, and the particles are free to settle under the action of gravity. The upper sedimentation zone and the lower sedimentation zone can respectively take larger and smaller surface hydraulic loads to obtain better sedimentation efficiency. Specifically, the aspect ratio of the upper sedimentation zone and the lower sedimentation zone of the pool body is not less than 4, and the aspect ratio is not less than 10; The settling time is controlled within 3 hours; the lower settling area can take a larger design load, which greatly reduces the design load of the upper settling tank to achieve better settling efficiency.

The outlet area collects treated water by setting finger-shaped outlet weir 2, and a zig-zag free overflow weir is arranged around the finger-shaped outlet weir 2. Through the control of the load rate of the overflow weir, it is generally required that the load rate of the overflow weir is not greater than 300m ³ /(m·d). The finger-shaped water outlet weir 2 merges the collected clear water into the water collection main pipe 3, and then discharges it through the water outlet main pipe 4 installed on the water collection main pipe 3.

Claims (6)

1. the double-deck rectangular sedimentation tank of surface water purifying of drinking water, it is characterized in that, pond body comprises two-layer up and down, water inlet position on the right of lower floor's pond body is provided with into water perforation tracery wall (1), lower floor's pond body is communicated with upper strata Chi Ti by water inlet perforation tracery wall (1) of upper strata inside left, lower floor's pond body is provided with many blowdowns bucket (6), bottom between every blowdown bucket (6) arranges discharge pipeline (7), and discharge pipeline (7) upper end is connected with spoil disposal house steward; At the bottom of pond, sludge discharging area, body upper strata, pond, longitudinal gradient is not less than 0.01, on the right side of sludge discharging area, upper strata, single sludge bucket (6) is set at the bottom of slope, upper strata Chi Ti is provided with and scrapes mud driving (5) for removing mud bottom the Chi Ti of upper strata, Chi Ti upper right side, upper strata arranges finger-type effluent weir (2), and finger-type effluent weir (2) end is provided with water header (3).

2. the double-deck rectangular sedimentation tank of a kind of surface water purifying of drinking water according to claim 1, it is characterized in that, described sludge bucket (6) Bian Bi inclination angle is 60 °.

3. the double-deck rectangular sedimentation tank of a kind of surface water purifying of drinking water according to claim 1, is characterized in that, the upper outfall sewer (4) installed of described water header (3).

4. the double-deck rectangular sedimentation tank of a kind of surface water purifying of drinking water according to claim 1, it is characterized in that, described water inlet perforation tracery wall (1) adopts brick or concrete block masonry, outside eyelet, part adopts cement sand plaster, water inlet perforation tracery wall (1) arrange up and down water inlet eyelet be staggeredly arranged, while in precipitation face above 0.3m-0.5m place to the wall not apertured eye of pond bottom part.

5. the double-deck rectangular sedimentation tank of a kind of surface water purifying of drinking water according to claim 1, it is characterized in that, the settling zone, upper strata of described pond body, the length-width ratio in lower sediment district are not less than 4, and length depth ratio is not less than 10, and settling zone section expands gradually.

6. the double-deck rectangular sedimentation tank of a kind of surface water purifying of drinking water according to claim 1, it is characterized in that, the degree of depth of the groove of finger-type effluent weir (2) is 0.3 ~ 0.5m.