CN205760048U - A kind of municipal sewage desanding device - Google Patents

Abstract

The utility model relates to an urban sewage desanding device, which belongs to the technical field of primary sewage treatment. It relates to a multifunctional belt-type pre-filter, which includes inclined filter cloth (12), the upper end of the filter cloth (12) adopts a first driving wheel (10) and the second driving wheel (9), and the lower end adopts a driven wheel (3 ) The filter cloth (12) is formed into an inclined filter cloth conveyor belt structure, and a mud sand extrusion dehydration device (7) is installed in the sand storage chamber (14). Strengthen the removal of mud and sand and improve the dehydration effect of mud and sand. The mud and sand filtered by the filter cloth rotate with the filter cloth and are swept by the brush into the sand storage chamber.

Description

A kind of urban sewage desanding device

technical field

The utility model relates to a multifunctional belt prefilter, which is used for strengthening the primary treatment of urban sewage. It belongs to the technical field of sewage treatment.

Background technique

With the rapid development of urban construction in our country, urban sewage treatment plants have become an indispensable part of urban construction. However, most of the primary treatment of sewage plants in operation in my country now follow the traditional typical process. Grids, fine screens, grit chambers and primary sedimentation tanks. However, the traditional primary treatment has many disadvantages such as too complicated process, many structures, large floor area, high energy consumption, and low treatment efficiency. These deficiencies do not conform to the environmental protection concept of energy saving and emission reduction advocated now. In addition, in the water treatment process, the sand production in the primary sedimentation tank is relatively large, mainly because a large amount of mud and sand in the grit chamber cannot be removed well and enter the primary sedimentation tank. Even if some mud and sand enter the sand-water separator from the aeration grit chamber, due to the short hydraulic retention time of the sand-water separator, the mud and sand cannot be removed well, causing most of the mud and sand to enter the primary sedimentation tank, increasing the initial The processing load of the sedimentation tank leads to a large area of the primary sedimentation tank, low treatment efficiency, and the purpose of sand removal cannot be achieved.

In the actual sewage plant, the sand accumulation in the inlet channel of the primary sedimentation tank and the tank group is serious, and a lot of money and energy are spent every year to maintain it without water and sand cleaning. At the same time, the sludge pump of the primary sedimentation tank transports sandy sludge for a long time Badly worn. The reasons for the analysis are mainly caused by the following aspects: (1) The daily water flow of the sewage treatment plant fluctuates greatly, the air-water ratio of the aerated grit chamber is not adjusted in time, and the sand settling effect in the pond is not good; (2) The water sucked out by the sand suction pump Sand-containing wastewater, due to the short hydraulic retention time of sand-water separation equipment, cannot separate sand from water, resulting in a large amount of mud and sand flowing back to the pump room through the sewer, and more and more mud and sand in the system accumulate; (3) Generally, between the primary sedimentation tank and the concentration tank There is a certain distance between them. Due to the large amount of sand in the sludge, the mud and sand will accumulate in the pipeline, resulting in relatively large pipeline resistance, so that the primary sedimentation tank cannot discharge the mud and sand in the sludge hopper in time, and the primary sedimentation tank will be blocked. At the same time, the sand pump is seriously worn out, resulting in an increase in the operating costs of the water plant. In order to change this situation, the microfiltration-dehydration integrated water treatment equipment is studied.

The traditional aerated grit chamber has the disadvantages of low efficiency, high cost, large floor area, incomplete treatment, and lengthy process. In view of this, the microfiltration-dehydration integrated water treatment equipment is studied, which greatly improves the effect of sand removal and dehydration. Small footprint, and has many advantages such as clean and hygienic, easy to control.

Utility model content

The device is researched and implemented from the two aspects of strengthening the removal of mud and sand in raw water and improving the dehydration effect of mud and sand. The utility model is a general-purpose continuous filtration-dehydration integrated water treatment equipment that can be used to remove various solids in water, and has a particularly effective filtration and removal effect on suspended or floating substances such as fibers, hair, sawdust, mud and sand. It can completely replace the traditional fine screen, grit chamber and primary sedimentation tank treatment unit, thus completely changing the traditional water treatment process. It has the advantages of high sand removal efficiency, cleanliness, small footprint and easy operation. It is characterized in that, in order to improve the removal effect of mud and sand in the sewage, a driving belt filter cloth is installed in the pre-filter, and the filter cloth is made of stainless steel mesh. At the same time, it has the function of squeezing and dehydrating the filtered mud and sand.

An urban sewage desanding device is a multi-functional belt pre-filter. The multi-functional belt pre-filter includes an inclined filter cloth (12), and the upper end of the filter cloth (12) adopts a first driving wheel (10) and a second Two driving wheels (9), the lower end adopts the driven wheel (3) to form the filter cloth (12) into an inclined filter cloth conveyor belt structure, the first driving wheel (10) and the second driving wheel (9) are horizontally parallel, so that the first driving wheel (10) and the filter cloth between the second driving wheel (9) is transmitted horizontally, and there is also a guide driven wheel (8) after the filter cloth (12) walks around the second drive wheel (9), and the guide driven wheel (8) ) at the same time also plays a role in supporting the transmission of filter cloth below; the upper part of the inclined filter cloth conveyor belt is the pre-filter water chamber; the lower part of the second drive wheel (9) is also provided with a blocking device to divide the lower part of the inclined filter cloth conveyor belt into two parts, The rear end part below the second drive wheel (9) is a filtered water chamber, and the filtered water chamber is provided with a clear water outlet (5); the front end part below the second drive wheel (9) is also provided with a circular tube type sand storage chamber (14 ), the sand storage chamber (14) is equipped with a mud sand extruding dewatering device (7), and the sand storage chamber (14) is also provided with a mud sand outlet (6); the water chamber before filtering is provided with a water inlet.

At the same time, the pre-filtration water chamber is also provided with an overflow port and an exhaust port.

At the same time, the pre-filter water chamber is provided with a water spray nozzle for cleaning the filter cloth.

The aperture of the filter cloth mesh is 0.3-1.0mm.

The filter cloth inclination angle is preferably 20-45 degrees.

The mud and sand extrusion dehydration device can use a screw rod.

Operation method: The raw water enters the pre-filter water chamber from the water inlet, enters the filtered water chamber after being filtered by the filter cloth, and the filtered clean water flows out from the water outlet. The mud and sand filtered by the filter cloth is driven with the filter cloth, and then swept by the brush into the sand storage chamber, and then squeezed to the sand outlet by the mud and sand squeezing dehydration device, thereby completing the sand removal and dehydration.

The pre-filter is equipped with a rotating belt filter cloth and a silt dewatering device, which intercepts suspended solids and floating solids in the sewage through the filtering effect of the filter cloth, and at the same time has the function of dehydrating the filtered silt.

The desanding effect of this equipment is better than that of the aeration grit chamber. It adopts filter screen to filter, and there are mud sand filtering area and mud sand dehydration area in the equipment. The filter screen can filter small suspended solids or floating solids such as fibers, hair, wood chips, silt and sand in the sewage, so as to reduce the processing load of the subsequent treatment structures and greatly reduce the area of the primary sedimentation tank of the sewage treatment plant. To a certain extent To improve the environment of sewage treatment. The equipment has a strong ability to resist impact loads and has a very strong adaptability to changes in water quality and water volume.

Description of drawings

Fig. 1 is the desanding equipment diagram of the utility model multifunctional belt prefilter.

The main components of this equipment:

1—water inlet, 2—overflow port, 3—driven wheel, 4—filtered water chamber, 5—clean water outlet, 6—sand outlet, 7—sand extrusion dehydration device, 8—guiding driven wheel, 9—the first Two driving wheels, 10—the first driving wheel, 11—exhaust port, 12—filter cloth, 13—water chamber before filtering, 14—sand storage chamber.

detailed description

The utility model will be further described below in conjunction with the examples of implementation, but the utility model is not limited to the following examples of implementation.

Example 1

The device of the present utility model is shown in Fig. 1 in detail, and the specific operation steps have been described in detail in the content of the utility model, and will not be repeated here. The pre-filter is mainly divided into three parts: the pre-filtration water chamber, the filtered water chamber and the sand storage chamber. Raw water enters the pre-filter water chamber from the water inlet, enters the after-filter water chamber after being filtered by the filter cloth, and finally the sewage is discharged to the drainage channel through the water outlet. The rotating filter cloth scrapes the filtered mud and sand to the mud sand chamber through the brush, and then squeezes the dewatering parts through the filtered matter for dehydration, and finally discharges the mud and sand from the pre-filter.

The utility model has been tested and studied in a sewage plant in Beijing. The operating conditions: the length, width and height of the equipment are 1.8m, 1.35m and 1.3m respectively, and the total power consumption is 2.25KW per hour during normal operation. 0.3mm, the filter screen is driven by the motor, the transmission speed of the filter cloth is 12r/s measured by the motor speed, and the nozzle water volume required by the equipment to clean the filter cloth is 5m ³ /h.

Influent water quality of prefilter: SS is 3360mg/L; VSS is 3120mg/L; COD is 230mg/L. Effluent water quality: SS is 1600mg/L; VSS is 1170mg/L; COD is 200mg/L. The water content of the mud and sand treated by the pre-filter is 67.7%, and the organic matter content is 41.5%. It has achieved a relatively good sand removal and dehydration effect, and has a certain effect on the removal of organic pollutants.

Claims (7)

1. A kind of urban sewage desanding device is characterized in that it is a multifunctional belt prefilter, the multifunctional belt prefilter includes an inclined filter cloth (12), and the upper end of the filter cloth (12) adopts the first The driving wheel (10) and the second driving wheel (9), the lower end adopts the driven wheel (3) to form the filter cloth (12) with an inclined filter cloth conveyor belt structure, and the first driving wheel (10) and the second driving wheel (9) are horizontal Parallel, so that the filter cloth transmission between the first driving wheel (10) and the second driving wheel (9) is horizontal, and there is a guide driven wheel (8) after the filter cloth (12) bypasses the second driving wheel (9) ), the guide driven wheel (8) also plays the role of supporting the filter cloth below; the upper part of the inclined filter cloth conveyor belt is the pre-filter water chamber; the second driving wheel (9) is also provided with a blocking device to move the inclined filter cloth The conveyor belt is divided into two parts below, the rear end part below the second drive wheel (9) is a filtered water chamber, and the filtered water chamber is provided with a clear water outlet (5); the front end part below the second drive wheel (9) is also provided with a round Tubular sand storage chamber (14), sand storage chamber (14) is equipped with mud and sand extrusion dehydration device (7), sand storage chamber (14) is also provided with mud sand outlet (6); pre-filtration water chamber is provided with water inlet . 2. According to a kind of urban sewage sand removal device according to claim 1, it is characterized in that, at the same time, the water chamber before filtration is also provided with an overflow port. 3. The urban sewage desanding device according to claim 1, characterized in that the water chamber before filtration is also provided with an air outlet. 4. The urban sewage desanding device according to claim 1, characterized in that the pre-filtration water chamber is provided with a water spray nozzle for cleaning the filter cloth. 5. The urban sewage desanding device according to claim 1, wherein the aperture of the filter cloth mesh is 0.3-1.0mm. 6. A desandering device for urban sewage according to claim 1, characterized in that the inclination angle of the filter cloth is 20-45 degrees. 7. The urban sewage desanding device according to claim 1, characterized in that the mud and sand extrusion dehydration device adopts a screw rod.