Product Description
Integrated treatment device for grid slag and sand settling
In order to ensure the safe operation of the physical system, mechanical sewage treatment must generally be carried out in the initial treatment section of the sewage treatment device. In order to prevent various operational failures (entanglement, wear, fine sand settling, etc.), the following mechanical pre-treatment must be carried out on the wastewater in this process: wastewater concentrate/shed slag treatment/sand precipitation separation/sand lifting separation/oil separation and scraping.
Figure 1 with multiple functions such as slag removal and sand settlingcIntegrated processing devie
These complex process treatments can currently be completed using integrated devices with compact structures and high processing efficiency. The so-called unity Chemical equipment refers to a complete system for mechanical sewage treatment of small and medium-sized sewage treatment plants (sewage flow rate within the range of 10-3001/s).
1. Equipment composition
In general, an integrated device is mainly composed of two parts, namely a grid device and a sand settling device. Specifically, the integrated processing unit is mainly composed of the following components:
(1) Install an inlet box with inlet pipe interface for installing grating machinery, emergency overflow weir, and emergency overflow pipeline interface.
(2) Rotary drum grating/screen is used to separate and remove coarse/fine solid substances, and after flushing, dewatering, and pressing through built-in grating slag, it is discharged into subsequent installed garbage containers.
(3) The sand separation device is composed of a stainless steel box, equipped with an aeration device, horizontal sand transport screws, and inclined sand discharge screws. The sediment material can be directly separated and discharged into the subsequent installation of garbage containers.
(4) The inclined sand discharge screw dehydrates the mineral sand material during the sand discharge process.
(5) The oil separation device can discharge the floating substances of the separated oil.
1.1 Fine filtration of sewage
Based on long-term engineering practice experience, it is known that the determination of grid equipment type and grid/screen spacing is actually related to the composition of wastewater, grid slag production, and subsequent biochemical treatment processes. Considering different inflow conditions (hydraulic state, slag production, sand settling production) and subsequent biological treatment requirements, the following types of filtration mechanical equipment can be used separately:
(1) ROTAMAT ® Fine grid Ro1, grid spacing of 6 or 10mm
(2) ROTAMAT ® Filtering device Ro2/RPPS, screen spacing
1-6mm
(3) ROTAMAT ® Filter screw Ro9, screen spacing 1-6mm
(4) Mesh plate rotary grating EscaMax ®, Aperture 1-10mm
(5) STEPSCREEN ® SSF, gate spacing 3/6mm
Of course, according to project requirements or requirements, other types of machinery with different grid/screen spacing can also be provided to users.
Among the various types of grid equipment mentioned above, the most widely used filtering device is the drum filter grid (Figure 2). This type of grille not only has a small volume and high separation efficiency, but can also be used for slag transportation, washing, and pressing simultaneously, without the need for additional slag washing and pressing machines.
The working principles of these machines are briefly described as follows:
The original sewage flows into the inlet box through the inlet pipe interface and then passes through the flow grid. The sediment of the grid residue is deposited inside the grid basket, causing the liquid level in front of the grid to rise. When the liquid level in front of the grate reaches the specified value, the grate begins to operate and the grate basket is cleaned by a teeth cleaning rake. The slag that falls into the hopper is also discharged by the transportation screw through the device. At the same time, the slag is washed, dehydrated, and pressed before being discharged into the subsequent installed garbage containers.
Figure 2 Various types of drum grille devices (equipped with built-in slag washing system)
In some sewage treatment plants lacking flushing water, it is possible to
The sewage feed box adopts a durable drum grille system. At this point, the separated slag can be washed using a built-in slag washing system (RGA). Then, press and dehydrate the pressing area within the ROTAMAT system. Under standard circumstances, emergency overflow pipes are installed in front of the grille to prevent unexpected situations. In addition, all sewage can also pass through emergency overflow during device maintenance
Pipeline, complete bypass flow through integrated processing device.
The design of the ROTAMAT grille series allows for subsequent improvements and upgrades as necessary. Can be followed up.
Upgrade and improve the following equipment: heating and insulation measures: built-in slag cleaning system; The bagging system operates within a closed system to ensure that no odor escapes.
1.2 Grid slag treatment system
According to the selected grid type, the grid residue can be washed, dehydrated, and pressed in the following ways:
(1) If the user chooses the ROTAMAT series grille, it will have slag filtration, transmission, flushing, and dewatering and pressing functions in a single compact device. There is no need to install an additional slag washing and pressing device. By selecting and configuring a built-in slag washing equipment (IRGA), slag washing treatment can be carried out. The washing of slag is carried out inside the mechanical lifting screw. At this point, the maximum solid content after dehydration can reach 45% DS.
(2) If the user chooses other types of grilles, such as the STEPSCREENSSF stepped grille and the EscaMax mesh plate rotary grille, the slag washing and dewatering are carried out in the subsequent installed WAP washing and pressing machine. Depending on the configured WAP model, the dewatering efficiency can reach up to 50%.
1.3 Sand and oil removal system
The working principle of the sand settling box can be described as follows according to Figure 5: After pre-treatment by the grid, the sewage continues to flow into the sand settling box.
Body. Install a row of aeration pipes along the bottom of one side of the sand settling box, which can input compressed air into the box through an air compressor. Turbulence is generated under the action of coarse bubble aeration, causing organic matter and inorganic mineralization.
Material phase separation, while under aeration, the sewage liquid always moves vertically upwards. At this point, under the synergistic effect of water flow inside the box, a spiral circulation will be generated along the horizontal direction to move forward. Under the combined effect of these two types of liquid flow, namely horizontal liquid flow along the longitudinal axis of the box and circular motion under aeration, sewage will generate a spiral circulation inside the sand settling box. Through this spiral circulation movement, the solid particulate matter contained in the sewage will be pushed towards the outer layer of the circulation under the action of centrifugal force. Compared to the central area of the box, the horizontal flow velocity in the outer edge area of the box is relatively slow. Therefore, through the circulation effect, solid particulate matter has more opportunities to come into contact with the bottom of the pool, and horizontal sand discharge screws are installed at the bottom of the flow. Due to the low flow rate in this area of the box, particulate matter will precipitate when passing through the bottom screw area. By the timed operation of the horizontal sand transport screw, the sediment in the sand settling box can be transported to the sand collection hopper of the sand discharge screw. The inclined sand discharge screw is used to collect these mineralized substances for dehydration treatment, and then discharged into the subsequently installed garbage container or transportation device.
Due to the circulation of liquid, floating substances of oil and grease will flow through the comb shaped partition in the sand settling box and enter the oil collection tank. By using a grease scraper and a water pump, the floating substances of grease that accumulate on the liquid surface can be collected and discharged.
The cleaned sewage enters the subsequent biochemical treatment stage through the drainage pipe.
Different from the working mode of ordinary sand settling tanks, the separated oil and grease material in the integrated device of grid slag and sand settling is pushed into the separated pump well by a scraper running along the longitudinal axis of the sand settling box. This mandatory scraping equipment, known as the grease scraper, is pulled by a steel cable and can safely and reliably scrape off the grease layer on the surface of the grease collection box. This oil scraper can safely clean the oil substances along the entire length of the oil collection box, ensuring that no sedimentation or anaerobic fermentation occurs.
In order to ensure the stability and trouble-free operation of the overall technical treatment process in small and medium-sized municipal sewage treatment plants, mechanical pretreatment of the raw sewage must be carried out before biochemical treatment:
(1) Grille filtration to remove coarse solid substances from wastewater:
(2) Sand setting device to remove sand and grease from wastewater;
(3) Initial sedimentation tank to remove inorganic sludge and fecal pollutants from wastewater
Mud.
In the process of rapid construction of sewage treatment plants, user units and design institutes can entrust mechanical sewage pretreatment to professional manufacturers, and focus their work and energy mainly on biochemical reaction tanks and secondary sedimentation tanks. Determine the volume of the reaction tank, bacterial retention time, hydraulic load, COD treatment load, and head loss for the selected biological treatment process flow.
In cases where funds cannot be fully allocated at once, user units can first purchase integrated devices for mechanical sewage treatment to reduce environmental pollution. Then wait for the funds to be in place before gradually completing the subsequent biochemical treatment system.
Our Advantages
Small and medium-sized sewage treatment plants with a flow rate range of 10-3001/s can quickly install and configure equipment. These high-efficiency integrated devices not only significantly accelerate and simplify design and installation work, but also can save additional construction costs. Compared with traditional geotechnical cement devices, the equipment of the front-end treatment device has the following advantages:
(1) The design and construction cycle is very short. Fast supply construction and installation debugging speed, while absolutely ensuring processing performance and quality:
(2) The transfer of design work and responsibility to the supplier reduces the overall design cost of the sewage treatment plant:
(3) Stainless steel equipment, with a service life almost the same as cement equipment
Sample:
(4) Modular processing scheme;
(5) The land occupation is very small.
It is worth mentioning that users must strictly inspect the quality of equipment and ensure the processing performance when selecting suppliers, so as to quickly and high-quality complete the construction task of small and medium-sized sewage treatment plants.
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