(1) Dosing and mixing
The dosing device is a metering pump as the main dosing device, which dissolves the medicine tank, agitator, level gauge, check valve, pressure gauge, buffer, pipeline, valve, base, escalator, and electronic control system. The process needs to be assembled on a common platform to form a module.
Mixing: Raw water (≥0 07Mpa) first enters the static pipe mixer. The main function of the static mixer is to fully mix the added agent with water to achieve the best reaction effect.
Dissolution: Add solid polyaluminum chloride or polyacrylamide into the medicine dissolving barrel, stir and dissolve it with a stirrer, and formulate into a certain concentration of coagulant and coagulant aid liquid.
Dosing: The coagulant and coagulant are dosed by two metering pumps respectively. The optimal dosage is determined according to the water quality of the raw water (small test), so that the suspended matter and colloidal impurities in the raw water are subsequently added. The precipitation clarification process is effectively removed.
The dosing volume and dosing pressure of the dosing device can be selected according to the needs of the process. Appropriate products can be selected from the range of 1L / h to 8000L / h and pressure from 0.1MPa to 25MPa, and the metering pump's metering accuracy can be as high as ¡À 1%.
High degree of automation, the dosage can be adjusted according to water quality, saving operating costs;
Independent dosing system, convenient for real-time dosing, low operation difficulty;
Can realize local control, remote automatic control, manual and automatic conversion between each other;
It has the advantages of compact structure, small size, low noise, stable work, simple installation, convenient operation and so on.
(2) Water distribution device
The raw water after dosing and mixing enters the integrated water purifier, and first enters the water distribution area at the bottom of the device. The water inlet of the water purifier is the bottom water distribution area, and the perforated pipe distributes water to ensure that the equipment is evenly distributed. The water at the hole is sprayed at a certain flow rate, and a deflector is installed to make the sediment flow to the sludge area. Pollution is not easy to occur, the water quality is adjusted uniformly, and the water flows up to the reaction flocculation area.
Advantages: uniform water distribution, resistance to the impact of water instability, adjustment of water quality, no dead corner water distribution inside the equipment, etc.
(3) Coagulation reaction zone
The role of the condensation reaction zone in this equipment is the first key process of the three major processes of conventional physical treatment in water plants. The reaction effect directly affects the quality and quantity of effluent water. When a coagulant (or flocculant) is added to water, the liquid phase and the mass phase are almost synchronized. When flowing through the reaction device, due to the continuous change of the water flow channel, the solid and liquid mass points not only have the main flow. It also has pulsating cycles of up, down, left, and right. During the process of passing through the circulation reaction zone, the fine alum flowers in the raw water make full contact with the sludge, and a flocculation reaction occurs, so that the small alum flowers in the water gradually grow large and form. Large particle floc, high removal rate of foreign particles. Create favorable conditions for sedimentation and increase the concentration rate of sludge. Increase the sludge content in the sludge area and reduce the self-consumption rate of the system. Therefore, the device can adapt to various high turbidity raw water, and the removal rate of impurities and particles is high. Under certain use conditions, it also has algae removal function.
Advantages: small footprint, good sedimentation effect, integrated overall design without separate settings, short response time, etc.
Effect: increase the sludge volume in the sludge area, large floc formation, high concentration of discharged sludge, and high removal rate of foreign particles.
(4) Inclined tube sedimentation area
Subsidence is divided into two parts, the hydraulic gradient value is improved by changing the diameter of the inclined pipe of the upper and lower layers. According to the theory of shallow sedimentation, a slanted tube is set up to accelerate the sedimentation, and the large granular flocs formed in the lower reaction zone quickly change the direction of the water flow between the two slanted tubes, which will increase the chance of contact between the small particle flocs. When passing through the upper inclined pipe, the effluent water quality is further improved.
The formed floc suspension is rectified in a layer of inclined pipe. The layer of inclined pipe plays the role of uniform water distribution and flow guide. After full reaction, the floc water flows upward along the inclined direction of the two-layer inclined pipe. After entering the settlement area for solid-liquid separation, the deposited sludge slides downward along the inclined direction of the inclined tube under the action of the gravity thrust water flow.
Advantages: Accelerate the sedimentation speed, improve the sedimentation effect, increase the surface load of the sedimentation area, good solid-liquid separation effect, and large impact load.
(5) Mud collection area and mud discharge
The sludge settled in the inclined tube sedimentation area is hydraulically pushed and naturally settled. Part of the sludge is hydraulically pushed into the sludge area. In order to ensure the thoroughness of sludge discharge in the sludge area, the sludge area of each set of water purifiers is divided by partitions. A plurality of small rooms, each room is provided with an electric sludge drainage system and an auxiliary sludge drainage device.
Each water purifier dredging system consists of multiple sets of electric dredging valves and pressure inlet solenoid valves. The dredging pipe adopts a perforated pipe structure. The dredging system adopts a perforated pipe type. It is set along the bottom of the sludge area and is used for dredging. The agitation of the sludge area is conducive to the thorough drainage of sludge.
The system sludge is carried out according to a set time program. Each cycle of the sludge area is sludged for 1-3 minutes (the sludge time is adjustable). The sludge is discharged from multiple sludge chambers of each water purifier.
Advantages: Fully automatic control system, saving manpower, perforated pipe pressure water for dredging of fruit, even and thorough dredging, no residue
(6) Water collection and filter water distribution area
An adjustable triangular weir plate is used to collect water in the clear water area of the sedimentation tank, and the water is collected into the water collecting tank to make the system collect water uniformly. The water collecting tank is provided with a plurality of sets of water distribution pipes, which are respectively entered into a plurality of filter tanks.
The water collecting tank enters the filter room through the water distribution pipe, and the outlet is equipped with a baffle to avoid the impact of the water flow on the filter room top plate and the filter material. The clean water area of the filter room uses a large-flow ABS cloth cap, which can ensure that the fresh water rises in time when the water is produced and that the backwash flow is sufficient during the backwash.
Advantages: uniform water distribution, smooth flow rate; large flow water distribution cap design, which provides the necessary prerequisites for the automatic operation of siphon.
(7) Fully automatic filter area
The precipitated water is distributed by the water distribution tank through the water distribution pipe into each filtering room, water is distributed through the U-shaped water sealer, and passes through the filter material layer from top to bottom. The filtered water passes through the connecting pipe in the filter tank to the clean water chamber on the top of the filter chamber under the action of gravity. The effluent from the clean room enters the flushing water tank by gravity.
Each filter room is equipped with a set of siphon backwashing system. The backwashing drainage of the filter system is based on the principle of gravity siphon, and the siphon is formed by the set head loss value. The clean water in the filter room clean water and the filtered water are automatically used for backwashing. Flush, filter layer backwash water is connected to the sewer to enter the plant's main drainage pipe network.
After a certain period of time, the effluent in the sedimentation zone of the inclined pipe is filtered by the filter material layer. As the running resistance of the filter material layer gradually increases, the water level in the siphon riser gradually increases. When the water level rises to the position of the siphon auxiliary tube, the air in the siphon tube assists with the siphon. The pipe drains to form a negative pressure, and the air in the siphon is continuously taken away. Finally, the water level in the siphon rising pipe and the siphon descending pipe is connected, that is, the siphon is formed. The clean water in the upper room of the filter room is quickly reversed by the static pressure of the clear water layer and vacuum suction. Flushing, the clean water in the device returns in the opposite direction of the normal running path. When the clean water passes through the filter material layer, the filter material is backwashed. The backwash intensity of the filter chamber is adjusted by the conical adjustment plate of the drain pipe nozzle. Backwash intensity and backwash time, each backwash lasts 4-5 minutes, and the backwash intensity is 14-16 L / ㎡.s.
Advantages: stable filtration speed, no need to set valves, no need for separate compressed air for backwashing, convenient operation management, low energy loss, etc.
Effect: The effluent is stable and the water quality is good, the backwash water consumption is less than 3%, and the effluent water is less than 3NTU.