In the complex engineering system of sewage treatment, the selection of lamella clarifiers is the core link, and the accuracy of its selection is directly related to the treatment effect and operational benefits.
The amount of treated water is the primary basis for determining the scale of the lamella clarifier. Taking a small factory with a daily sewage treatment volume of only tens of cubic meters as an example, the scale of the sedimentation tank required is very different from that of a large urban sewage treatment plant that treats tens of thousands of tons of sewage per day. The larger the amount of treated water, the larger the volume and floor space of the sedimentation tank. Accurately measuring the amount of treated water is the basic data for the subsequent selection and design of the lamella clarifier, which directly affects the investment and operation efficiency of the equipment.
The selection of the shape of the sedimentation tank is very critical. First of all, the horizontal flow sedimentation tank is suitable for projects with large water treatment volume and small water quality fluctuations, such as primary treatment of urban sewage, which can remove sand and large suspended solids and help subsequent deep treatment; the vertical flow sedimentation tank has advantages in treating small water volume scenes, such as small factories and mine sewage treatment. When the particle concentration is high and the sedimentation performance is good, efficient sedimentation and separation can be achieved with a small footprint; radial flow sedimentation tanks are often used in the secondary sedimentation stage of large sewage treatment plants, and are effective in treating suspended solids such as activated sludge. The long sedimentation path is conducive to sludge sedimentation and separation, ensuring that the effluent water quality meets the standards. Of course, sludge treatment cannot be ignored. When the sludge content is high, a sludge scraper is a good choice.
