Suzhou Weizhi Water Treatment Equipment Co

Suzhou Weizhi Water Treatment Equipment Co., Ltd.
The relationship between the overflow rate of the sedimentation tank and the particle settling speed: Classification of sedimentation tanks and their respective flow characteristics: advection type (inflow from one end, flowing horizontally in the tank, and overflowing from the other end ), radial flow type (entering from the center, the wastewater after sedimentation overflows from the periphery of the pool, flowing horizontally), vertical flow type (entering from the lower part of the center of the pool, flowing from bottom to upward, and the wastewater after sedimentation overflows from the surface and sides of the pool) Inclined tube The principle and specific method of enhancing the sedimentation effect of the sedimentation tank: The principle is an ideal sedimentation tank: under ideal conditions, the sedimentation tank separated into layers can theoretically have twice the water passing capacity of the original tank. Specific method: Change the horizontal partition to an inclined plane that is inclined at a certain angle to the horizontal plane to form an inclined plate or inclined tube.
The working principle of the aeration grit tank: Due to the aeration effect, the organic particles in the wastewater are often in a suspended state. The sand particles rub against each other and bear the shear force of aeration. The organic pollutants attached to the sand particles can be removed, and there is Conducive to obtaining relatively pure sand.
Grid: It is a metal frame made of a set of parallel metal bars, placed obliquely on the channel through which wastewater flows, or at the entrance of the water collection tank of a pumping station, to intercept large pieces of suspended solids. or floating solid pollutants. Slow filter, fast filter, high-speed filter
Filtration speed: After closing the water inlet valve, start recording the time immediately until the water level in the filter drops to near the drainage outlet, and record the drop height of the water level. The time it takes for the falling height and the water level in the filter to drop is the filtration speed. Backwash intensity: refers to the amount of flushing water passing through the unit filter area per unit time. (/.) Uneven coefficient of filter material: (gradation of filter material) refers to the proportion of particles with different particle sizes in the filter material, expressed
Filtration cycle: The time interval between two backwashes is called The time interval between the start of the filtration cycle and the end of the hair wash is called the backwash duration.
The filtration mechanism of the filter: ① Mechanical filtering effect: The filter material layer is composed of filter material particles of different sizes, with many pores in between. When the wastewater flows through, the ones larger than the pores are trapped in the pores, so The pores become smaller and smaller, and smaller suspended particles that enter later are also trapped, allowing the wastewater to be purified. ②Adsorption and contact cohesion: When wastewater flows through the filter material layer, it has to pass through winding water channels. There are many opportunities for contact between suspended particles and filter material. When in contact, due to the force between molecules, Adsorption and contact coagulation occur, especially when flocculant is added before filtration, the contact coagulation effect is more prominent. The smaller the filter material particles, the better the adsorption and contact coagulation effect.
 time later, correspondingly from No.,. . . The same amount of water samples were taken out from the same height in each sedimentation tube, and the suspended solid content was measured to be \\3. . . . The sedimentation rate is the sedimentation rate of suspended matter over time. Taking the sedimentation rate as the abscissa and the sedimentation rate as the ordinate, the relationship curve between sedimentation rate and sedimentation rate can be drawn.
Analysis of the working process of an ideal sedimentation tank: The assumptions are as follows: ① The wastewater in the tank flows in the horizontal direction, from the inlet to the outlet, the particles are evenly distributed horizontally, and each particle flows according to the horizontal flow rate ② The suspended particles are evenly distributed throughout the water depth , its horizontal partial velocity is equal to the horizontal flow velocity of wastewater, and the sinking speed of each particle is fixed. ③ Once the particles settle, they will no longer float. The sedimentation tank is divided into four parts: the inflow area, the outflow area, the sedimentation area and the sludge area.